CN102923384A - Sandwich packaging belt and production method thereof - Google Patents
Sandwich packaging belt and production method thereof Download PDFInfo
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- CN102923384A CN102923384A CN2012104473984A CN201210447398A CN102923384A CN 102923384 A CN102923384 A CN 102923384A CN 2012104473984 A CN2012104473984 A CN 2012104473984A CN 201210447398 A CN201210447398 A CN 201210447398A CN 102923384 A CN102923384 A CN 102923384A
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Abstract
A sandwich packaging belt comprises a polypropylene (PP) surface coating layer and a core coating layer which is coated inside the PP surface coating layer and composed of PP and calcium carbonate. The production method includes the steps that the sandwich PP material and the calcium carbonate are evenly mixed; a surface coating layer extruder and a core coating layer extruder are prepared; surface coating layer raw materials are divided into two portions after extruded by the surface coating layer extruder, a portion of core coating layer raw materials is coated by the two portions of surface coating layer raw materials in a die orifice, and the raw materials are co-extruded to from a packaging belt blank; the packaging belt blank is cooled and placed into a heating stretching oven for stretching through a drawing roller; after the stretching, the packaging belt blank is subjected to embossing and placed into a sizing annealing oven for annealing; and after sizing, the packaging belt blank is dragged and rolled for forming after cooling. The packaging belt can bear various weights, resource waste is reduced during the production process, and the production cost is reduced.
Description
(1) technical field
The present invention relates to the manufacture method of a kind of strap and strap.
(2) background technology
Existing individual layer strap, for example the strap of Qingdao water accumulating resin Co., Ltd is single layer structure, is comprised of the PP virgin material, its main technique is that the PP virgin material is directly extruded through extruder.The major defect of this strap is very high to the requirements for quality of material, but in use for lightweight product, the waste resource, cost is high, and result of use is poor.
And for example the strap of Hangzhou Yongchuang Machinery Co., Ltd. is single layer structure, is made of the PP feed back, and main technique is that the PP feed back is directly extruded through extruder.Although its main shortcoming is that feed back provides cost savings, and has reduced to a certain extent waste, in use for lightweight product, still waste resource, cost is high, and result of use is poor.
(3) summary of the invention
In order to overcome the above-mentioned deficiency of existing strap, the invention provides a kind ofly economize on resources, the wide sandwich strap of applicable packing weight range, and provide its manufacture method.
The technical scheme that the present invention solves its technical matters is: a kind of sandwich strap, comprise PP envelope layer, and also comprise core wrapper, described core wrapper is wrapped in the described PP envelope layer;
Described core wrapper is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 1～1: 0.1.
The manufacture method of above-mentioned sandwich strap comprises the following steps:
A. sandwich PP material and calcium carbonate are mixed;
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 150～250 ℃;
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, the surface temperature of die orifice is 150～200 ℃;
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 100～300 ℃;
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 20～150 ℃, and time of heat is 1～5 second;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.
Preferably, in step C, envelope layer raw material enters an annular sub-material mould, and the front end of described annular sub-material mould is inlet point, and the rear end of described annular sub-material mould is two discharging openings;
Described die orifice has vertical core wrapper inlet point, the below of described core wrapper inlet point is the material folding mouth with its UNICOM, the lower end of described core wrapper inlet point is positioned at the scope of described material folding mouth, and namely the lower end of core wrapper inlet point is in the scope of material folding mouth upper port;
Two discharging openings of described annular sub-material mould respectively with described material folding mouth UNICOM;
The below of described material folding mouth is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point of the centrally aligned of described molding port.
Preferred described molding port comprises by upper excessively ferry from lower mutual UNICOM, tightens mouth, co-extrusion mouth, the described width at ferry of crossing is less than the width of described material folding mouth, the described mouth that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth equals the described width that tightens mouthful lower end.
Preferably, the center of the described material folding mouth of the centrally aligned of described core wrapper inlet point, described core wrapper inlet point is cylindrical, described material folding mouth is patty, it is described that the ferry is cylindrical excessively, described tightening mouthful is the upper surface and the lower surface is rectangular sheet four prism type, and described co-extrusion mouth is cuboid in the form of sheets.
Preferably, in step D, place coolant storage tank to cool off the strap embryo, the temperature of cooling water expansion tank is 10～50 ℃; Strap embryo after having finalized the design in step F places the typing water tank to cool off, and the temperature of cooling water expansion tank is 0～30 ℃.
Beneficial effect of the present invention is: strap of the present invention comprises envelope layer and core wrapper, and core wrapper contains calcium carbonate, and the strap of invention can be born on the lenient side to heavy all kinds of weight; Wherein the envelope layer can select PP virgin material, one-level, secondary feed back to carry out envelope, and core wrapper selects PP one-level, secondary, three grades of feed backs and calcium carbonate to carry out cored, reduces the wasting of resources, reduces production costs.
(4) description of drawings
Fig. 1 is the structural representation of sandwich strap of the present invention.
Fig. 2 is the structural representation of die orifice.
Fig. 3 is the cutaway view of die orifice.
(5) specific embodiment
Below in conjunction with the drawings and specific embodiments the present invention is described in further detail.
Embodiment one
With reference to Fig. 1, a kind of sandwich strap comprises PP envelope layer 1, also comprises core wrapper 2, and described core wrapper 2 is sandwiched in the described PP envelope layer 1, and by PP envelope layer 1 parcel; Described core wrapper 2 is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 0.5.
The manufacture method of this sandwich strap comprises the following steps:
A. sandwich PP material and calcium carbonate are mixed.
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 200 ℃.
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, and two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, and the surface temperature of die orifice is 180 ℃.
With reference to Fig. 2, Fig. 3, in the present embodiment, envelope layer raw material enters an annular sub-material mould 3, and the front end of described annular sub-material mould 3 is inlet point 4, and the rear end of described annular sub-material mould 3 is two discharging openings, thus bag
The surface layer raw material is divided into two strands;
Described die orifice has vertical core wrapper inlet point 5, and the below of described core wrapper inlet point 5 is and the material folding mouth 6 of its UNICOM that the lower end of described core wrapper inlet point 5 is positioned at the scope of described material folding mouth 6;
Two discharging openings of described annular sub-material mould 3 respectively with described material folding mouth 6 UNICOMs;
The below of described material folding mouth 6 is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point 5 of the centrally aligned of described molding port.Described molding port comprises by upper excessively ferry 7 from lower mutual UNICOM, tightens mouth 8, co-extrusion mouth 9, the described width at ferry 7 of crossing is less than the width of described material folding mouth 6, the described mouth 8 that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth 9 equals the described width that tightens mouthful 8 lower ends.The center of the described material folding mouth 6 of centrally aligned of the inlet point of core wrapper described in the present embodiment 5, described core wrapper inlet point 5 is cylindrical, described material folding mouth 6 is patty, it is described that ferry 7 is cylindrical excessively, describedly tighten mouthfuls 8 and be the upper surface and the lower surface is rectangular sheet four prism type, described co-extrusion mouth 9 is cuboid in the form of sheets.
Envelope layer extruder enters in the inlet point 4 of annular sub-material mould front end after envelope layer raw material extruded, and envelope layer raw material disperses to both sides, thereby forms two strands of raw materials, and two strands of raw materials enter in the material folding mouth 6 from two discharging openings respectively;
The core wrapper raw material enters core wrapper inlet point 5, enter again material folding mouth 6 downwards, because the lower end of core wrapper inlet point is positioned at the scope of described material folding mouth, the core wrapper raw material is by 360 ° of parcels of envelope layer raw material, raw material behind the parcel forms the backward lower inflow molding port of ectonexine, the width of molding port is more and more less, and slowly transition is extruded by the co-extrusion mouth.
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 200 ℃.Place coolant storage tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 10 ℃.
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 80 ℃, and time of heat is 3 seconds;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.Place the typing water tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 10 ℃.
Embodiment two
With reference to Fig. 1, a kind of sandwich strap comprises PP envelope layer 1, also comprises core wrapper 2, and described core wrapper 2 is sandwiched in the described PP envelope layer 1, and by PP envelope layer 1 parcel; Described core wrapper 2 is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 0.2.
The manufacture method of this sandwich strap comprises the following steps:
A. sandwich PP material and calcium carbonate are mixed.
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 150 ℃.
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, and two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, and the surface temperature of die orifice is 190 ℃.
With reference to Fig. 2, Fig. 3, in the present embodiment, envelope layer raw material enters an annular sub-material mould 3, and the front end of described annular sub-material mould 3 is inlet point 4, and the rear end of described annular sub-material mould 3 is two discharging openings, thereby envelope layer raw material is divided into two strands;
Described die orifice has vertical core wrapper inlet point 5, and the below of described core wrapper inlet point 5 is and the material folding mouth 6 of its UNICOM that the lower end of described core wrapper inlet point 5 is positioned at the scope of described material folding mouth 6;
Two discharging openings of described annular sub-material mould 3 respectively with described material folding mouth 6 UNICOMs;
The below of described material folding mouth 6 is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point 5 of the centrally aligned of described molding port.Described molding port comprises by upper excessively ferry 7 from lower mutual UNICOM, tightens mouth 8, co-extrusion mouth 9, the described width at ferry 7 of crossing is less than the width of described material folding mouth 6, the described mouth 8 that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth 9 equals the described width that tightens mouthful 8 lower ends.The center of the described material folding mouth 6 of centrally aligned of the inlet point of core wrapper described in the present embodiment 5, described core wrapper inlet point 5 is cylindrical, described material folding mouth 6 is patty, it is described that ferry 7 is cylindrical excessively, describedly tighten mouthfuls 8 and be the upper surface and the lower surface is rectangular sheet four prism type, described co-extrusion mouth 9 is cuboid in the form of sheets.
Envelope layer extruder enters in the inlet point 4 of annular sub-material mould front end after envelope layer raw material extruded, and envelope layer raw material disperses to both sides, thereby forms two strands of raw materials, and two strands of raw materials enter in the material folding mouth 6 from two discharging openings respectively;
The core wrapper raw material enters core wrapper inlet point 5, enter again material folding mouth 6 downwards, because the lower end of core wrapper inlet point is positioned at the scope of described material folding mouth, the core wrapper raw material is by 360 ° of parcels of envelope layer raw material, raw material behind the parcel forms the backward lower inflow molding port of ectonexine, the width of molding port is more and more less, and slowly transition is extruded by the co-extrusion mouth.
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 1200 ℃.Place coolant storage tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 30 ℃.
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 500 ℃, and time of heat is 2.5 seconds;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.Place the typing water tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 20 ℃.
Embodiment three
With reference to Fig. 1, a kind of sandwich strap comprises PP envelope layer 1, also comprises core wrapper 2, and described core wrapper 2 is sandwiched in the described PP envelope layer 1, and by PP envelope layer 1 parcel; Described core wrapper 2 is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 0.1.
The manufacture method of this sandwich strap comprises the following steps:
A. sandwich PP material and calcium carbonate are mixed.
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 170 ℃.
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, and two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, and the surface temperature of die orifice is 150 ℃.
With reference to Fig. 2, Fig. 3, in the present embodiment, envelope layer raw material enters an annular sub-material mould 3, and the front end of described annular sub-material mould 3 is inlet point 4, and the rear end of described annular sub-material mould 3 is two discharging openings, thereby envelope layer raw material is divided into two strands;
Described die orifice has vertical core wrapper inlet point 5, and the below of described core wrapper inlet point 5 is and the material folding mouth 6 of its UNICOM that the lower end of described core wrapper inlet point 5 is positioned at the scope of described material folding mouth 6;
Two discharging openings of described annular sub-material mould 3 respectively with described material folding mouth 6 UNICOMs;
The below of described material folding mouth 6 is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point 5 of the centrally aligned of described molding port.Described molding port comprises by upper excessively ferry 7 from lower mutual UNICOM, tightens mouth 8, co-extrusion mouth 9, the described width at ferry 7 of crossing is less than the width of described material folding mouth 6, the described mouth 8 that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth 9 equals the described width that tightens mouthful 8 lower ends.The center of the described material folding mouth 6 of centrally aligned of the inlet point of core wrapper described in the present embodiment 5, described core wrapper inlet point 5 is cylindrical, described material folding mouth 6 is patty, it is described that ferry 7 is cylindrical excessively, describedly tighten mouthfuls 8 and be the upper surface and the lower surface is rectangular sheet four prism type, described co-extrusion mouth 9 is cuboid in the form of sheets.
Envelope layer extruder enters in the inlet point 4 of annular sub-material mould front end after envelope layer raw material extruded, and envelope layer raw material disperses to both sides, thereby forms two strands of raw materials, and two strands of raw materials enter in the material folding mouth 6 from two discharging openings respectively;
The core wrapper raw material enters core wrapper inlet point 5, enter again material folding mouth 6 downwards, because the lower end of core wrapper inlet point is positioned at the scope of described material folding mouth, the core wrapper raw material is by 360 ° of parcels of envelope layer raw material, raw material behind the parcel forms the backward lower inflow molding port of ectonexine, the width of molding port is more and more less, and slowly transition is extruded by the co-extrusion mouth.
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 300 ℃.Place coolant storage tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 20 ℃.
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 20 ℃, and time of heat is 4 seconds;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.Place the typing water tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 5 ℃.
Embodiment four
With reference to Fig. 1, a kind of sandwich strap comprises PP envelope layer 1, also comprises core wrapper 2, and described core wrapper 2 is sandwiched in the described PP envelope layer 1, and by PP envelope layer 1 parcel; Described core wrapper 2 is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 0.4.
The manufacture method of this sandwich strap comprises the following steps:
A. sandwich PP material and calcium carbonate are mixed.
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 250 ℃.
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, and two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, and the surface temperature of die orifice is 160 ℃.
With reference to Fig. 2, Fig. 3, in the present embodiment, envelope layer raw material enters an annular sub-material mould 3, and the front end of described annular sub-material mould 3 is inlet point 4, and the rear end of described annular sub-material mould 3 is two discharging openings, thus bag
The surface layer raw material is divided into two strands;
Described die orifice has vertical core wrapper inlet point 5, and the below of described core wrapper inlet point 5 is and the material folding mouth 6 of its UNICOM that the lower end of described core wrapper inlet point 5 is positioned at the scope of described material folding mouth 6;
Two discharging openings of described annular sub-material mould 3 respectively with described material folding mouth 6 UNICOMs;
The below of described material folding mouth 6 is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point 5 of the centrally aligned of described molding port.Described molding port comprises by upper excessively ferry 7 from lower mutual UNICOM, tightens mouth 8, co-extrusion mouth 9, the described width at ferry 7 of crossing is less than the width of described material folding mouth 6, the described mouth 8 that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth 9 equals the described width that tightens mouthful 8 lower ends.The center of the described material folding mouth 6 of centrally aligned of the inlet point of core wrapper described in the present embodiment 5, described core wrapper inlet point 5 is cylindrical, described material folding mouth 6 is patty, it is described that ferry 7 is cylindrical excessively, describedly tighten mouthfuls 8 and be the upper surface and the lower surface is rectangular sheet four prism type, described co-extrusion mouth 9 is cuboid in the form of sheets.
Envelope layer extruder enters in the inlet point 4 of annular sub-material mould front end after envelope layer raw material extruded, and envelope layer raw material disperses to both sides, thereby forms two strands of raw materials, and two strands of raw materials enter in the material folding mouth 6 from two discharging openings respectively;
The core wrapper raw material enters core wrapper inlet point 5, enter again material folding mouth 6 downwards, because the lower end of core wrapper inlet point is positioned at the scope of described material folding mouth, the core wrapper raw material is by 360 ° of parcels of envelope layer raw material, raw material behind the parcel forms the backward lower inflow molding port of ectonexine, the width of molding port is more and more less, and slowly transition is extruded by the co-extrusion mouth.
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 100 ℃.Place coolant storage tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 50 ℃.
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 150 ℃, and time of heat is 1.5 seconds;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.Place the typing water tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 0 ℃.
Embodiment five
With reference to Fig. 1, a kind of sandwich strap comprises PP envelope layer 1, also comprises core wrapper 2, and described core wrapper 2 is sandwiched in the described PP envelope layer 1, and by PP envelope layer 1 parcel; Described core wrapper 2 is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 1.
The manufacture method of this sandwich strap comprises the following steps:
A. sandwich PP material and calcium carbonate are mixed.
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 220 ℃.
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, and two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, and the surface temperature of die orifice is 200 ℃.
With reference to Fig. 2, Fig. 3, in the present embodiment, envelope layer raw material enters an annular sub-material mould 3, and the front end of described annular sub-material mould 3 is inlet point 4, and the rear end of described annular sub-material mould 3 is two discharging openings, thereby envelope layer raw material is divided into two strands;
Described die orifice has vertical core wrapper inlet point 5, and the below of described core wrapper inlet point 5 is and the material folding mouth 6 of its UNICOM that the lower end of described core wrapper inlet point 5 is positioned at the scope of described material folding mouth 6;
Two discharging openings of described annular sub-material mould 3 respectively with described material folding mouth 6 UNICOMs;
The below of described material folding mouth 6 is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point 5 of the centrally aligned of described molding port.Described molding port comprises by upper excessively ferry 7 from lower mutual UNICOM, tightens mouth 8, co-extrusion mouth 9, the described width at ferry 7 of crossing is less than the width of described material folding mouth 6, the described mouth 8 that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth 9 equals the described width that tightens mouthful 8 lower ends.The center of the described material folding mouth 6 of centrally aligned of the inlet point of core wrapper described in the present embodiment 5, described core wrapper inlet point 5 is cylindrical, described material folding mouth 6 is patty, it is described that ferry 7 is cylindrical excessively, describedly tighten mouthfuls 8 and be the upper surface and the lower surface is rectangular sheet four prism type, described co-extrusion mouth 9 is cuboid in the form of sheets.
Envelope layer extruder enters in the inlet point 4 of annular sub-material mould front end after envelope layer raw material extruded, and envelope layer raw material disperses to both sides, thereby forms two strands of raw materials, and two strands of raw materials enter in the material folding mouth 6 from two discharging openings respectively;
The core wrapper raw material enters core wrapper inlet point 5, enter again material folding mouth 6 downwards, because the lower end of core wrapper inlet point is positioned at the scope of described material folding mouth, the core wrapper raw material is by 360 ° of parcels of envelope layer raw material, raw material behind the parcel forms the backward lower inflow molding port of ectonexine, the width of molding port is more and more less, and slowly transition is extruded by the co-extrusion mouth.
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 160 ℃.Place coolant storage tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 45 ℃.
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 130 ℃, and time of heat is 1 second;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.Place the typing water tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 30 ℃.
Embodiment six
With reference to Fig. 1, a kind of sandwich strap comprises PP envelope layer 1, also comprises core wrapper 2, and described core wrapper 2 is sandwiched in the described PP envelope layer 1, and by PP envelope layer 1 parcel; Described core wrapper 2 is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 0.6.
The manufacture method of this sandwich strap comprises the following steps:
A. sandwich PP material and calcium carbonate are mixed.
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 180 ℃.
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, and two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, and the surface temperature of die orifice is 170 ℃.
With reference to Fig. 2, Fig. 3, in the present embodiment, envelope layer raw material enters an annular sub-material mould 3, and the front end of described annular sub-material mould 3 is inlet point 4, and the rear end of described annular sub-material mould 3 is two discharging openings, thereby envelope layer raw material is divided into two strands;
Described die orifice has vertical core wrapper inlet point 5, and the below of described core wrapper inlet point 5 is and the material folding mouth 6 of its UNICOM that the lower end of described core wrapper inlet point 5 is positioned at the scope of described material folding mouth 6;
Two discharging openings of described annular sub-material mould 3 respectively with described material folding mouth 6 UNICOMs;
The below of described material folding mouth 6 is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point 5 of the centrally aligned of described molding port.Described molding port comprises by upper excessively ferry 7 from lower mutual UNICOM, tightens mouth 8, co-extrusion mouth 9, the described width at ferry 7 of crossing is less than the width of described material folding mouth 6, the described mouth 8 that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth 9 equals the described width that tightens mouthful 8 lower ends.The center of the described material folding mouth 6 of centrally aligned of the inlet point of core wrapper described in the present embodiment 5, described core wrapper inlet point 5 is cylindrical, described material folding mouth 6 is patty, it is described that ferry 7 is cylindrical excessively, describedly tighten mouthfuls 8 and be the upper surface and the lower surface is rectangular sheet four prism type, described co-extrusion mouth 9 is cuboid in the form of sheets.
Envelope layer extruder enters in the inlet point 4 of annular sub-material mould front end after envelope layer raw material extruded, and envelope layer raw material disperses to both sides, thereby forms two strands of raw materials, and two strands of raw materials enter in the material folding mouth 6 from two discharging openings respectively;
The core wrapper raw material enters core wrapper inlet point 5, enter again material folding mouth 6 downwards, because the lower end of core wrapper inlet point is positioned at the scope of described material folding mouth, the core wrapper raw material is by 360 ° of parcels of envelope layer raw material, raw material behind the parcel forms the backward lower inflow molding port of ectonexine, the width of molding port is more and more less, and slowly transition is extruded by the co-extrusion mouth.
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 280 ℃.Place coolant storage tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 25 ℃.
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 90 ℃, and time of heat is 5 seconds;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.Place the typing water tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 15 ℃.
Embodiment seven
With reference to Fig. 1, a kind of sandwich strap comprises PP envelope layer 1, also comprises core wrapper 2, and described core wrapper 2 is sandwiched in the described PP envelope layer 1, and by PP envelope layer 1 parcel; Described core wrapper 2 is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 0.9.
The manufacture method of this sandwich strap comprises the following steps:
A. sandwich PP material and calcium carbonate are mixed.
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 230 ℃.
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, and two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, and the surface temperature of die orifice is 165 ℃.
With reference to Fig. 2, Fig. 3, in the present embodiment, envelope layer raw material enters an annular sub-material mould 3, and the front end of described annular sub-material mould 3 is inlet point 4, and the rear end of described annular sub-material mould 3 is two discharging openings, thereby envelope layer raw material is divided into two strands;
Described die orifice has vertical core wrapper inlet point 5, and the below of described core wrapper inlet point 5 is and the material folding mouth 6 of its UNICOM that the lower end of described core wrapper inlet point 5 is positioned at the scope of described material folding mouth 6;
Two discharging openings of described annular sub-material mould 3 respectively with described material folding mouth 6 UNICOMs;
The below of described material folding mouth 6 is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point 5 of the centrally aligned of described molding port.Described molding port comprises by upper excessively ferry 7 from lower mutual UNICOM, tightens mouth 8, co-extrusion mouth 9, the described width at ferry 7 of crossing is less than the width of described material folding mouth 6, the described mouth 8 that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth 9 equals the described width that tightens mouthful 8 lower ends.The center of the described material folding mouth 6 of centrally aligned of the inlet point of core wrapper described in the present embodiment 5, described core wrapper inlet point 5 is cylindrical, described material folding mouth 6 is patty, it is described that ferry 7 is cylindrical excessively, describedly tighten mouthfuls 8 and be the upper surface and the lower surface is rectangular sheet four prism type, described co-extrusion mouth 9 is cuboid in the form of sheets.
Envelope layer extruder enters in the inlet point 4 of annular sub-material mould front end after envelope layer raw material extruded, and envelope layer raw material disperses to both sides, thereby forms two strands of raw materials, and two strands of raw materials enter in the material folding mouth 6 from two discharging openings respectively;
The core wrapper raw material enters core wrapper inlet point 5, enter again material folding mouth 6 downwards, because the lower end of core wrapper inlet point is positioned at the scope of described material folding mouth, the core wrapper raw material is by 360 ° of parcels of envelope layer raw material, raw material behind the parcel forms the backward lower inflow molding port of ectonexine, the width of molding port is more and more less, and slowly transition is extruded by the co-extrusion mouth.
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 250 ℃.Place coolant storage tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 40 ℃.
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 110 ℃, and time of heat is 3.5 seconds;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.Place the typing water tank to cool off the strap embryo in the present embodiment, the temperature of cooling water expansion tank is 25 ℃.
Claims (6)
1. a sandwich strap comprises PP envelope layer, it is characterized in that: also comprise core wrapper, described core wrapper is wrapped in the described PP envelope layer;
Described core wrapper is comprised of PP and calcium carbonate, and the mass ratio of PP and calcium carbonate is 1: 1～1: 0.1.
2. the manufacture method of a sandwich strap as claimed in claim 1 is characterized in that comprising the following steps:
A. sandwich PP material and calcium carbonate are mixed;
B. prepare envelope layer extruder, core wrapper extruder, the core wrapper extruder adopts Φ 60～90mm vented screw extruder, envelope layer extruder adopts Φ 40～70mm vented screw extruder, and the heating-up temperature of envelope layer extruder, core wrapper extruder is 150～250 ℃;
C. envelope layer extruder extruded rear envelope layer raw material with envelope layer raw material and is divided into two strands, two strands of envelope layer raw materials form the strap embryo with core wrapper raw material parcel and co-extrusion that one is extruded by the core wrapper extruder in die orifice, the surface temperature of die orifice is 150～200 ℃;
D. will extend by draw roll in entering the heating drawing oven after the strap embryo cooling, the heating-up temperature of heating drawing oven is 100～300 ℃;
E. the strap embryo who extends after finishing carries out embossing through knurling rolls again, enters at last typing annealing baking oven and finalizes the design, and wherein the temperature of typing annealing baking oven is 20～150 ℃, and time of heat is 1～5 second;
F. the strap embryo after having finalized the design is through cooling rear haulage rolling moulding.
3. the manufacture method of sandwich strap as claimed in claim 2, it is characterized in that: in step C, envelope layer raw material enters an annular sub-material mould, and the front end of described annular sub-material mould is inlet point, and the rear end of described annular sub-material mould is two discharging openings;
Described die orifice has vertical core wrapper inlet point, and the below of described core wrapper inlet point is and the material folding mouth of its UNICOM that the lower end of described core wrapper inlet point is positioned at the scope of described material folding mouth;
Two discharging openings of described annular sub-material mould respectively with described material folding mouth UNICOM;
The below of described material folding mouth is the vertical molding port with its UNICOM, the center of the described core wrapper inlet point of the centrally aligned of described molding port.
4. the manufacture method of sandwich strap as claimed in claim 3, it is characterized in that: described molding port comprises by upper excessively ferry from lower mutual UNICOM, tightens mouth, co-extrusion mouth, the described width at ferry of crossing is less than the width of described material folding mouth, the described mouth that tightens is shunk from lower gradually by upper, and the width of described co-extrusion mouth equals the described width that tightens mouthful lower end.
5. the manufacture method of sandwich strap as claimed in claim 4, it is characterized in that: the center of the described material folding mouth of the centrally aligned of described core wrapper inlet point, described core wrapper inlet point is cylindrical, described material folding mouth is patty, it is described that the ferry is cylindrical excessively, described tightening mouthful is the upper surface and the lower surface is rectangular sheet four prism type, and described co-extrusion mouth is cuboid in the form of sheets.
6. such as the manufacture method of the described sandwich strap of one of claim 2～5, it is characterized in that: in step D, place coolant storage tank to cool off the strap embryo, the temperature of cooling water expansion tank is 10～50 ℃;
Strap embryo after having finalized the design in step F places the typing water tank to cool off, and the temperature of cooling water expansion tank is 0～30 ℃.
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| CN201210447398.4A CN102923384B (en) | 2012-11-06 | 2012-11-06 | Sandwich packaging belt and production method thereof |
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| US5716570A (en) * | 1995-05-02 | 1998-02-10 | Hoechst Aktiengesellschaft | Process for the production of polypropylene films |
| CN1231982A (en) * | 1998-04-14 | 1999-10-20 | 陈泉龙 | Method for producing strap for bundling miniature machine |
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| US20080157424A1 (en) * | 2004-03-01 | 2008-07-03 | Toyo Kohan Co., Ltd. | Process for Producing Unstretched Film, Process for Producing Resin-Coated Metal Sheet, and Apparatus for Producing Unstretched Film |
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| CN102923384B (en) | 2014-07-23 |
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