US20030008034A1 - Method and apparatus for injection molding articles - Google Patents
Method and apparatus for injection molding articles Download PDFInfo
- Publication number
- US20030008034A1 US20030008034A1 US09/900,083 US90008301A US2003008034A1 US 20030008034 A1 US20030008034 A1 US 20030008034A1 US 90008301 A US90008301 A US 90008301A US 2003008034 A1 US2003008034 A1 US 2003008034A1
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- Prior art keywords
- nozzle
- accordance
- valve member
- cavity
- communication
- Prior art date
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- Abandoned
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- 238000001746 injection moulding Methods 0.000 title claims abstract description 16
- 238000000034 method Methods 0.000 title description 2
- 238000004891 communication Methods 0.000 claims description 27
- 238000007789 sealing Methods 0.000 claims description 26
- 239000000463 material Substances 0.000 claims description 25
- 238000002347 injection Methods 0.000 claims description 19
- 239000007924 injection Substances 0.000 claims description 19
- 230000009969 flowable effect Effects 0.000 claims description 18
- 238000001816 cooling Methods 0.000 claims description 8
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 239000000155 melt Substances 0.000 claims description 5
- 239000012530 fluid Substances 0.000 claims 6
- 239000012768 molten material Substances 0.000 description 16
- 238000012546 transfer Methods 0.000 description 3
- 108091092889 HOTTIP Proteins 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000012809 cooling fluid Substances 0.000 description 1
- 230000006866 deterioration Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000002045 lasting effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/2701—Details not specific to hot or cold runner channels
- B29C45/2708—Gates
- B29C45/2711—Gate inserts
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/278—Nozzle tips
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/26—Moulds
- B29C45/27—Sprue channels ; Runner channels or runner nozzles
- B29C45/28—Closure devices therefor
- B29C45/2806—Closure devices therefor consisting of needle valve systems
- B29C2045/2879—Back flow of material into nozzle channel
Definitions
- This invention relates to injection molding systems. More specifically, the present invention relates to a valve gating system found in injection molding systems.
- Injection molding nozzles are well known and are used to inject materials, such as plastic, into the cavity of a mold.
- such nozzles receive molten material, such as plastic, from an injection molding machine and direct the same into a mold cavity through a passage called a gate.
- molten material such as plastic
- the transfer of molten material through the gate must be stopped.
- thermal, or open, gating; and valve gating two methods exist for stopping the transfer of molten material through the gate.
- the gate In thermal gating, the gate is an open aperture through which molten material passes during an injection operation.
- the gate is rapidly cooled at the end of the injection portion of the cycle, when the injection pressure is removed, to “freeze” the injected material into a plug.
- This plug remains in the gate to prevent drool of molten material from the gate when the mold is open for the ejection of the molded part.
- the cooling applied to the gate is removed and hot molten material from the injection molding machine pushes the plug into the mold cavity, where it melts and mixes with the newly provided molten material.
- valve gating In valve gating, the opening and closing of the gate is independent of injection pressure and/or cooling and is achieved mechanically with a valve stem. This stem can be moved between an open position, wherein flow of molten materials through the gate is permitted, and a closed position wherein the gate is closed by entry of the valve stem into the gate which establishes a seal, preventing molten materials from passing through the gate.
- Valve gating is well known and examples of such systems are shown in U.S. Pat. Nos. 2,878,515; 3,023,458; and 3,530,539, each being incorporated herein by reference.
- valve gating is preferable to thermal gating because it can reduce the undesired gate vestige which results on the finished molded part.
- problems with valve gating systems there are problems with valve gating systems.
- valve stem and gate each have a complementary sealing portion which are brought into contact to seal the gate.
- a complementary sealing portion typically there is a 0.001′′-0.002′′ diametrical clearance between the valve stem and the gate sealing portion.
- a slight misalignment of the stem with the gate will cause the stem to strike the gate sealing portion. Over time, this will cause the gate area to wear and become misshapen. Now that the gate sealing area is worn, the stem no longer stops the flow of molten material and a small amount of molten material will migrate between the stem and the worn gate sealing area.
- the mold halves will open and the molded article in a somewhat solidified state will be removed from the area of the stem/gate area. Due to the entrapped molten material between the worn gate area and the stem, the molded article will not break away cleanly when the mold is opened, but rather will tear away from the gate area, which results in a blemished vestige on the molded article.
- a nozzle assembly 10 is comprised of an elongated nozzle bushing 12 with a nozzle tip 16 affixed co-axially therein.
- an insulator 14 is affixed to a proximal end of the nozzle tip 16 thereby thermally insulating the heated nozzle assembly 10 from the cooled cavity plate 34 .
- a movable valve member 18 extends co-axially in the nozzle assembly 10 and is selectably positioned in or out of a passageway/gate area 22 .
- a melt channel 20 surrounds the valve member 18 and runs the length of the nozzle assembly 10 to communicate a flowable material to a mold cavity 28 .
- valve member 18 When the valve member 18 is placed in a fully closed position (as shown in FIG. 1), a sealing portion 25 in the cavity plate 34 sealingly surrounds the valve member 18 to shut off the flow of material to the mold cavity 28 . As shown in FIG. 1, a face portion 21 of valve member 18 defines the entire top of the vestige 26 of the molded article. A chamfer 36 is typically provided along the face of the valve member 18 to help guide the valve member into the gate area and reduce wear of the valve member and cavity plate 34 .
- valve member 18 Due to the close fit of the valve member 18 to the sealing portion 25 , any misalignment that exists between their respective interfaces will cause the valve member 18 to strike the surface of the sealing portion 25 which will ultimately lead to a deterioration of the seal portion 25 and/or the valve member 18 .
- valve member 18 At the end of the injection cycle, the valve member 18 is moved into its closed position as previously described and the mold cavity is held in a closed position with a core 30 for a predetermined cycle time to allow the molten material to cool and solidify, thereby forming the molded article. Once the molded article has been allowed to cool to a sufficient level, the core 30 with the molded article thereon is moved in the direction as denoted by arrow A, and the vestige 26 is pulled away from the face portion 21 of the valve member 18 .
- valve member 18 If enough wear exists between the valve member 18 and the sealing portion 25 , a small amount of molten material will migrate therein, and as the mold core 30 and the molded article 27 are moved to an open position, a peeled edge 38 will form on the vestige 26 of the molded article 27 .
- valve member 18 As the valve member 18 is in the flow of molten material when the gate is open, it can become quite hot. When the gate is closed by the valve member 18 , the hot tip of the valve member 18 can be difficult to cool as the mold cavity 28 is cooled and this can result in a need for increased cycle times to permit the necessary cooling, and/or can result in undesirable characteristics in the molded article 27 . Specifically, as the material in the mold cavity 28 adjacent the valve member 18 is cooled less efficiently due to the hot tip, parts molded from thermally sensitive materials such as PET can suffer from an enlarged area of crystallinity 40 or other undesired characteristics. In addition, since the entire top surface of the vestige 26 is in contact with the face portion 21 of the hot valve member 18 , the molten material adjacent the face portion 21 remains somewhat molten and stringing and an uneven edge forms when the mold is opened.
- the primary objective of the present invention is to provide an improved injection molding system with a valve gating system that reduces or obviates the drawbacks of the prior art.
- Another object of the present invention is to provide an insert that interfaces with a valve member in an injection molding system that reduces or eliminates the formation of peeled edges along a vestige of a molded article.
- Yet another object of the present invention is to provide a gate insert in the mold plate adjacent the valve member that may be easily replaced.
- a mold cavity with a vestige cross-sectional area that is larger than the cross-sectional area of the valve member so that the periphery of the vestige is cooled quicker than the interior portion of the vestige.
- a replaceable insert is provided to help guide the valve member into a sealing position with the gate. Replacement of this insert can easily be performed whenever the wear of the insert reaches a predetermined and unacceptable level.
- FIG. 1 is a simplified cross-sectional view of an injection molding nozzle in accordance with the prior art
- FIG. 2 is a partial cross-sectional view of a molded article in accordance with the prior art
- FIGS. 3 and 3 a are simplified cross-sectional views of exemplicative embodiments in accordance with the present invention.
- FIGS. 4 a and 4 b are partial cross-sectional views of alternate exemplicative embodiments in accordance with the present invention.
- FIG. 5 is a simplified partial cross-sectional view of a molded article.
- an injection molding nozzle assembly 10 in accordance with the present invention is located in a cavity plate 34 for the communication of a flowable material to a mold cavity 28 for the formation of a molded article therein.
- Cavity plate 34 is provided with a plurality of cooling passageways 32 therein for the communication of a cooling fluid for the removal of heat from the cavity plate to cool and solidify the flowable material in the mold cavity 28 .
- the nozzle assembly 10 is comprised of an elongated nozzle bushing 12 with a nozzle tip 16 affixed to a proximal end of the nozzle bushing.
- the nozzle tip 16 is threaded to the nozzle bushing 12 , but any such suitable means could be used.
- a heater 17 is wrapped around the nozzle assembly 10 to maintain the flowable material in a viscous state.
- an optional insulator 14 is located between the nozzle tip 16 and the cooled cavity plate 34 to reduce the transfer of heat from the hot nozzle tip 16 to the cooled cavity plate 34 .
- valve member 18 Located co-axially in the nozzle assembly 10 is a movable valve member 18 that extends adjacent a vestige 26 of the mold cavity 28 .
- the valve member 18 is a slender elongated cylindrical piece that is moved up and down to an open and closed position respectively.
- the valve member 18 When the valve member 18 is in the open position as shown by phantom line 50 , the flowable material in melt channel 20 is allowed to enter the mold cavity 28 .
- the valve member 18 When placed in the closed position, as shown in FIG. 1, the valve member 18 is in sealing communication with a sealing portion 25 thereby stopping the flow of material to the mold cavity 28 .
- an insert 42 with a passageway 41 formed therein is placed in a cavity 44 located in the cavity plate 34 in alignment with the valve member 18 .
- the sealing portion 25 is located in this replaceable insert 42 to allow for easy maintenance when leakage around the valve member 18 starts to occur.
- the insert 42 may optionally provide a first chamfer 46 to help guide the valve member 18 when it first enters the passageway 41 and a second chamfer 48 to help guide the valve member further into the sealing portion 25 . These chamfers act to reduce wear on both the valve member 18 and the insert 42 and prolong the useable life of both components.
- Vestige 26 has a cross-sectional area larger than the face portion 21 of the valve member 18 . As such, a portion 23 of the vestige 26 is in thermal communication with the insert 42 . Given that the insert 42 is placed in the cooled cavity plate 34 , the insert 42 will cool portion 23 faster than the portion in contact with face portion 21 of the hot valve member 18 . This differential cooling action will allow portion 23 to solidify before the area adjacent face portion 21 . When core 30 is retracted to remove the molded article from the mold cavity 28 , this now solidified portion 23 will tend to breakaway more cleanly than the prior art.
- any tearing that may occur when the mold is opened is reduced or eliminated because the tear is not on the surface of the vestige/preform as in the prior art.
- this clean break will result in a more uniform and flat vestige 26 than previously seen.
- a reduced area of crystallinity 40 will form inside the molded article 27 due to the improved cooling of the vestige 26 .
- FIG. 3A an alternative embodiment in accordance with the present invention is shown which is identical to the embodiment in FIG. 3 except for the removal of the insert 42 .
- the sealing portion 25 is now located in the cavity plate 34 . Cooling of portion 23 will still occur quicker than in the remainder of the vestige 26 , which will allow for a substantially clean break when mold core 30 is retracted.
- FIGS. 4 a and 4 b show alternative embodiments of the insert 42 and the valve member 18 .
- the valve member 18 has a chamfer 54 near the vestige 26 .
- a reduced diameter section of the valve member is in sealing communication with the sealing portion 25 when in the closed position.
- At least one elongated recess 56 is formed in the surface of the valve member 18 which allows the flowable material to be forced up along the valve member 18 as the valve member is brought to the closed position.
- Chamfers 46 and 48 help guide the valve member 18 as it enters the passageway 41 and seats in the sealing portion 25 .
- FIG. 4 b shows the valve member 18 as one continuous cylinder down to the chamfer at the very bottom.
- the passageway 41 in the insert 42 is also a uniform diameter for most of its length, except for the lead in chamfer 46 .
- the sealing portion 25 can be longer and provide a longer lasting seal.
- the recess 56 allows the flowable material to flow up out of passageway 41 as the valve member 18 is brought to a closed position.
Abstract
Description
- 1. Field of the Invention
- This invention relates to injection molding systems. More specifically, the present invention relates to a valve gating system found in injection molding systems.
- 2. Summary of the Prior Art
- Injection molding nozzles are well known and are used to inject materials, such as plastic, into the cavity of a mold. For example, such nozzles receive molten material, such as plastic, from an injection molding machine and direct the same into a mold cavity through a passage called a gate. When an injection operation is complete, and prior to opening the mold cavity to eject the molded part, the transfer of molten material through the gate must be stopped. Generally, two methods exist for stopping the transfer of molten material through the gate, namely: thermal, or open, gating; and valve gating.
- In thermal gating, the gate is an open aperture through which molten material passes during an injection operation. The gate is rapidly cooled at the end of the injection portion of the cycle, when the injection pressure is removed, to “freeze” the injected material into a plug. This plug remains in the gate to prevent drool of molten material from the gate when the mold is open for the ejection of the molded part. In the next injection portion of the cycle, the cooling applied to the gate is removed and hot molten material from the injection molding machine pushes the plug into the mold cavity, where it melts and mixes with the newly provided molten material.
- In valve gating, the opening and closing of the gate is independent of injection pressure and/or cooling and is achieved mechanically with a valve stem. This stem can be moved between an open position, wherein flow of molten materials through the gate is permitted, and a closed position wherein the gate is closed by entry of the valve stem into the gate which establishes a seal, preventing molten materials from passing through the gate. Valve gating is well known and examples of such systems are shown in U.S. Pat. Nos. 2,878,515; 3,023,458; and 3,530,539, each being incorporated herein by reference.
- Generally, for situations that require improved aesthetics, valve gating is preferable to thermal gating because it can reduce the undesired gate vestige which results on the finished molded part. However, there are problems with valve gating systems.
- Specifically, the valve stem and gate each have a complementary sealing portion which are brought into contact to seal the gate. Typically there is a 0.001″-0.002″ diametrical clearance between the valve stem and the gate sealing portion. As the valve stem is moved into alignment with the sealing portion of the gate to effect sealing, a slight misalignment of the stem with the gate will cause the stem to strike the gate sealing portion. Over time, this will cause the gate area to wear and become misshapen. Now that the gate sealing area is worn, the stem no longer stops the flow of molten material and a small amount of molten material will migrate between the stem and the worn gate sealing area. This leakage adversely impacts the vestige quality because as the mold is opened, the now solidified material between the gate and the valve stem will cause a tear or blemish to form along the vestige of the part, and in extreme cases, the tearing can propagate to the surface of the molded article or preform.
- Following the injection cycle, typically the mold halves will open and the molded article in a somewhat solidified state will be removed from the area of the stem/gate area. Due to the entrapped molten material between the worn gate area and the stem, the molded article will not break away cleanly when the mold is opened, but rather will tear away from the gate area, which results in a blemished vestige on the molded article.
- Referring to FIGS. 1 and 2 this phenomenon can be clearly seen. As well known in the art, a
nozzle assembly 10 is comprised of an elongated nozzle bushing 12 with anozzle tip 16 affixed co-axially therein. Optionally, aninsulator 14 is affixed to a proximal end of thenozzle tip 16 thereby thermally insulating the heatednozzle assembly 10 from the cooledcavity plate 34. Amovable valve member 18 extends co-axially in thenozzle assembly 10 and is selectably positioned in or out of a passageway/gate area 22. Amelt channel 20 surrounds thevalve member 18 and runs the length of thenozzle assembly 10 to communicate a flowable material to amold cavity 28. When thevalve member 18 is placed in a fully closed position (as shown in FIG. 1), asealing portion 25 in thecavity plate 34 sealingly surrounds thevalve member 18 to shut off the flow of material to themold cavity 28. As shown in FIG. 1, aface portion 21 ofvalve member 18 defines the entire top of thevestige 26 of the molded article. Achamfer 36 is typically provided along the face of thevalve member 18 to help guide the valve member into the gate area and reduce wear of the valve member andcavity plate 34. - Due to the close fit of the
valve member 18 to thesealing portion 25, any misalignment that exists between their respective interfaces will cause thevalve member 18 to strike the surface of thesealing portion 25 which will ultimately lead to a deterioration of theseal portion 25 and/or thevalve member 18. - At the end of the injection cycle, the
valve member 18 is moved into its closed position as previously described and the mold cavity is held in a closed position with acore 30 for a predetermined cycle time to allow the molten material to cool and solidify, thereby forming the molded article. Once the molded article has been allowed to cool to a sufficient level, thecore 30 with the molded article thereon is moved in the direction as denoted by arrow A, and thevestige 26 is pulled away from theface portion 21 of thevalve member 18. If enough wear exists between thevalve member 18 and thesealing portion 25, a small amount of molten material will migrate therein, and as themold core 30 and themolded article 27 are moved to an open position, a peeled edge 38 will form on thevestige 26 of themolded article 27. - Also, as the
valve member 18 is in the flow of molten material when the gate is open, it can become quite hot. When the gate is closed by thevalve member 18, the hot tip of thevalve member 18 can be difficult to cool as themold cavity 28 is cooled and this can result in a need for increased cycle times to permit the necessary cooling, and/or can result in undesirable characteristics in the moldedarticle 27. Specifically, as the material in themold cavity 28 adjacent thevalve member 18 is cooled less efficiently due to the hot tip, parts molded from thermally sensitive materials such as PET can suffer from an enlarged area ofcrystallinity 40 or other undesired characteristics. In addition, since the entire top surface of thevestige 26 is in contact with theface portion 21 of thehot valve member 18, the molten material adjacent theface portion 21 remains somewhat molten and stringing and an uneven edge forms when the mold is opened. - Therefore there is a need for an improved injection-molding machine with a valve gate system that reduces or obviates some or all of the drawbacks of the prior art.
- The primary objective of the present invention is to provide an improved injection molding system with a valve gating system that reduces or obviates the drawbacks of the prior art.
- Another object of the present invention is to provide an insert that interfaces with a valve member in an injection molding system that reduces or eliminates the formation of peeled edges along a vestige of a molded article.
- Yet another object of the present invention is to provide a gate insert in the mold plate adjacent the valve member that may be easily replaced.
- The foregoing objects are achieved by providing a mold cavity with a vestige cross-sectional area that is larger than the cross-sectional area of the valve member so that the periphery of the vestige is cooled quicker than the interior portion of the vestige. In another preferred embodiment, a replaceable insert is provided to help guide the valve member into a sealing position with the gate. Replacement of this insert can easily be performed whenever the wear of the insert reaches a predetermined and unacceptable level.
- Further objections and advantages of the present invention will appear hereinbelow.
- FIG. 1 is a simplified cross-sectional view of an injection molding nozzle in accordance with the prior art;
- FIG. 2 is a partial cross-sectional view of a molded article in accordance with the prior art;
- FIGS. 3 and 3a are simplified cross-sectional views of exemplicative embodiments in accordance with the present invention;
- FIGS. 4a and 4 b are partial cross-sectional views of alternate exemplicative embodiments in accordance with the present invention;
- FIG. 5 is a simplified partial cross-sectional view of a molded article.
- Referring now to FIG. 3, an injection
molding nozzle assembly 10 in accordance with the present invention is located in acavity plate 34 for the communication of a flowable material to amold cavity 28 for the formation of a molded article therein.Cavity plate 34 is provided with a plurality ofcooling passageways 32 therein for the communication of a cooling fluid for the removal of heat from the cavity plate to cool and solidify the flowable material in themold cavity 28. - The
nozzle assembly 10, as well known in the art, is comprised of an elongated nozzle bushing 12 with anozzle tip 16 affixed to a proximal end of the nozzle bushing. In a preferred embodiment, thenozzle tip 16 is threaded to thenozzle bushing 12, but any such suitable means could be used. Typically, aheater 17 is wrapped around thenozzle assembly 10 to maintain the flowable material in a viscous state. In the preferred embodiment anoptional insulator 14 is located between thenozzle tip 16 and the cooledcavity plate 34 to reduce the transfer of heat from thehot nozzle tip 16 to the cooledcavity plate 34. Located co-axially in thenozzle assembly 10 is amovable valve member 18 that extends adjacent avestige 26 of themold cavity 28. In a preferred embodiment, thevalve member 18 is a slender elongated cylindrical piece that is moved up and down to an open and closed position respectively. When thevalve member 18 is in the open position as shown byphantom line 50, the flowable material inmelt channel 20 is allowed to enter themold cavity 28. When placed in the closed position, as shown in FIG. 1, thevalve member 18 is in sealing communication with a sealingportion 25 thereby stopping the flow of material to themold cavity 28. - In one preferred embodiment, an
insert 42 with apassageway 41 formed therein is placed in acavity 44 located in thecavity plate 34 in alignment with thevalve member 18. In this arrangement, the sealingportion 25 is located in thisreplaceable insert 42 to allow for easy maintenance when leakage around thevalve member 18 starts to occur. - The
insert 42 may optionally provide afirst chamfer 46 to help guide thevalve member 18 when it first enters thepassageway 41 and asecond chamfer 48 to help guide the valve member further into the sealingportion 25. These chamfers act to reduce wear on both thevalve member 18 and theinsert 42 and prolong the useable life of both components. -
Vestige 26, as shown in the figures, has a cross-sectional area larger than theface portion 21 of thevalve member 18. As such, aportion 23 of thevestige 26 is in thermal communication with theinsert 42. Given that theinsert 42 is placed in the cooledcavity plate 34, theinsert 42 will coolportion 23 faster than the portion in contact withface portion 21 of thehot valve member 18. This differential cooling action will allowportion 23 to solidify before the areaadjacent face portion 21. Whencore 30 is retracted to remove the molded article from themold cavity 28, this now solidifiedportion 23 will tend to breakaway more cleanly than the prior art. In addition, due to the location of the sealingportion 25 being internal and displaced from the outer surface of thefinished vestige 26, any tearing that may occur when the mold is opened is reduced or eliminated because the tear is not on the surface of the vestige/preform as in the prior art. - As shown in FIG. 5, this clean break will result in a more uniform and
flat vestige 26 than previously seen. In addition, a reduced area ofcrystallinity 40 will form inside the moldedarticle 27 due to the improved cooling of thevestige 26. - Referring to FIG. 3A, an alternative embodiment in accordance with the present invention is shown which is identical to the embodiment in FIG. 3 except for the removal of the
insert 42. As shown in FIG. 3A, the sealingportion 25 is now located in thecavity plate 34. Cooling ofportion 23 will still occur quicker than in the remainder of thevestige 26, which will allow for a substantially clean break whenmold core 30 is retracted. - FIGS. 4a and 4 b (where like features have like numerals) show alternative embodiments of the
insert 42 and thevalve member 18. As shown in FIG. 4a, thevalve member 18 has achamfer 54 near thevestige 26. A reduced diameter section of the valve member is in sealing communication with the sealingportion 25 when in the closed position. At least oneelongated recess 56 is formed in the surface of thevalve member 18 which allows the flowable material to be forced up along thevalve member 18 as the valve member is brought to the closed position. Chamfers 46 and 48 help guide thevalve member 18 as it enters thepassageway 41 and seats in the sealingportion 25. FIG. 4b shows thevalve member 18 as one continuous cylinder down to the chamfer at the very bottom. Thepassageway 41 in theinsert 42 is also a uniform diameter for most of its length, except for the lead inchamfer 46. In this embodiment, the sealingportion 25 can be longer and provide a longer lasting seal. Therecess 56 allows the flowable material to flow up out ofpassageway 41 as thevalve member 18 is brought to a closed position. - It is to be understood that the invention is not limited to the illustrations described herein, which are deemed to illustrate the best modes of carrying out the invention, and which are susceptible to modification of form, size, arrangement of parts and details of operation. The invention is intended to encompass all such modifications, which are within its spirit and scope as defined by the claims.
Claims (36)
Priority Applications (14)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/900,083 US20030008034A1 (en) | 2001-07-06 | 2001-07-06 | Method and apparatus for injection molding articles |
JP2003510234A JP2004520984A (en) | 2001-07-06 | 2002-05-27 | Method and apparatus for injection molding articles |
ES02729720T ES2291468T3 (en) | 2001-07-06 | 2002-05-27 | APPARATUS FOR MOLDING BY INJECTION OF ARTICLES. |
CNB2005100737502A CN100398295C (en) | 2001-07-06 | 2002-05-27 | Method and apparatus for injection molding articles |
CNA028136454A CN1537045A (en) | 2001-07-06 | 2002-05-27 | Method and apparatus for injuction molding articles |
DE60221845T DE60221845T2 (en) | 2001-07-06 | 2002-05-27 | DEVICE FOR INJECTION MOLDING OF ARTIFICIAL ARTICLES |
AT02729720T ATE369964T1 (en) | 2001-07-06 | 2002-05-27 | DEVICE FOR INJECTION MOLDING PLASTIC OBJECTS |
PCT/CA2002/000774 WO2003004243A1 (en) | 2001-07-06 | 2002-05-27 | Method and apparatus for injection molding articles |
EP02729720A EP1406754B1 (en) | 2001-07-06 | 2002-05-27 | Apparatus for injection molding articles |
CA002449179A CA2449179A1 (en) | 2001-07-06 | 2002-05-27 | Method and apparatus for injection molding articles |
TW091111704A TW590870B (en) | 2001-07-06 | 2002-05-31 | Injection molding apparatus |
US10/670,870 US7037103B2 (en) | 2001-07-06 | 2003-09-25 | Apparatus for injection molded articles |
US10/847,854 US7156651B2 (en) | 2001-07-06 | 2004-05-19 | Apparatus for injection molding articles |
PCT/CA2005/000622 WO2005110701A1 (en) | 2001-07-06 | 2005-04-25 | Improved apparatus for injection molding articles |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/900,083 US20030008034A1 (en) | 2001-07-06 | 2001-07-06 | Method and apparatus for injection molding articles |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/670,870 Continuation-In-Part US7037103B2 (en) | 2001-07-06 | 2003-09-25 | Apparatus for injection molded articles |
Publications (1)
Publication Number | Publication Date |
---|---|
US20030008034A1 true US20030008034A1 (en) | 2003-01-09 |
Family
ID=25411944
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/900,083 Abandoned US20030008034A1 (en) | 2001-07-06 | 2001-07-06 | Method and apparatus for injection molding articles |
US10/670,870 Expired - Fee Related US7037103B2 (en) | 2001-07-06 | 2003-09-25 | Apparatus for injection molded articles |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US10/670,870 Expired - Fee Related US7037103B2 (en) | 2001-07-06 | 2003-09-25 | Apparatus for injection molded articles |
Country Status (10)
Country | Link |
---|---|
US (2) | US20030008034A1 (en) |
EP (1) | EP1406754B1 (en) |
JP (1) | JP2004520984A (en) |
CN (2) | CN100398295C (en) |
AT (1) | ATE369964T1 (en) |
CA (1) | CA2449179A1 (en) |
DE (1) | DE60221845T2 (en) |
ES (1) | ES2291468T3 (en) |
TW (1) | TW590870B (en) |
WO (1) | WO2003004243A1 (en) |
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US20030235638A1 (en) * | 2002-04-12 | 2003-12-25 | Mold-Masters Limited | Mold gate insert with a thermal barrier |
US20040071817A1 (en) * | 2002-07-30 | 2004-04-15 | Jonathon Fischer | Valve pin guidance and alignment system for an injection molding apparatus |
US20040137107A1 (en) * | 2002-11-21 | 2004-07-15 | Denis Babin | Hot runner nozzle with a tip, a tip surrounding piece and an alignment piece |
US20040146598A1 (en) * | 2002-02-21 | 2004-07-29 | Mold-Masters Ltd. | Valve pin guiding tip for a nozzle |
US20040258788A1 (en) * | 2002-12-09 | 2004-12-23 | George Olaru | Nozzle tip and seal |
US20050003039A1 (en) * | 2001-10-03 | 2005-01-06 | Denis Babin | Nozzle seal for an injection molding apparatus |
US20050106283A1 (en) * | 2001-10-03 | 2005-05-19 | Gheorghe Olaru | Injection molding nozzle |
US20050118298A1 (en) * | 2001-10-05 | 2005-06-02 | Denis Babin | Gap seal between nozzle components |
US20050136151A1 (en) * | 2000-04-12 | 2005-06-23 | Mold-Masters Limited | Injection nozzle system and injection molding machine incorporating same |
US6921259B2 (en) | 2002-02-21 | 2005-07-26 | Mold-Masters Limited | Valve pin guide for a valve-gated nozzle |
US20050281906A1 (en) * | 2004-06-16 | 2005-12-22 | Noot Dirk V | Hot runner nozzle |
US20070190204A1 (en) * | 2006-01-18 | 2007-08-16 | Hon Hai Precision Industry Co., Ltd. | Mold for forming workpiece |
US20080279979A1 (en) * | 2007-05-09 | 2008-11-13 | Mold-Masters Limited | Injection Molding Nozzle With Valve Pin Alignment |
US20100092601A1 (en) * | 2008-10-10 | 2010-04-15 | Mold-Masters (2007) Limited | Injection Molding Valve Gated Hot Runner Nozzle |
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CN102802909A (en) * | 2010-04-05 | 2012-11-28 | 赫斯基注塑系统有限公司 | Mold-tool assembly including resin-retaining device located relative to stem-tip portion |
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US9248595B2 (en) | 2014-06-24 | 2016-02-02 | Athena Automation Ltd. | Hot runner apparatus for an injection molding machine |
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CA1136815A (en) * | 1980-07-15 | 1982-12-07 | Jobst U. Gellert | Injection molding nozzle seal |
CA1261579A (en) * | 1987-03-19 | 1989-09-26 | Mold-Masters Limited | Replaceable rocker arm assembly for injection molding system |
US5254305A (en) | 1987-12-10 | 1993-10-19 | Otto Hofstetter Ag | Injection nozzle and method for charging an injection nozzle |
JP3222894B2 (en) * | 1991-04-10 | 2001-10-29 | 田中貴金属工業株式会社 | Platinum group metal recovery method |
DE59404200D1 (en) | 1993-08-13 | 1997-11-06 | Awm Werkzeugbau Ag | Spray nozzle |
CA2175634C (en) * | 1996-05-02 | 2007-08-21 | Klaus Bauer | Injection molding valve member with head and neck portions |
EP0836925A1 (en) * | 1996-10-09 | 1998-04-22 | EUROTOOL Beheer B.V. | Valve-gated injection moulding device |
US6056536A (en) * | 1997-03-20 | 2000-05-02 | Husky Injection Molding Systems Ltd. | Valve gating apparatus for injection molding |
US6135757A (en) * | 1998-10-16 | 2000-10-24 | Husky Injection Systems Ltd. | Valve gated injection molding system |
US6318990B1 (en) * | 1998-10-16 | 2001-11-20 | Mold-Masters Limited | Injection molding nozzle apparatus |
US6168416B1 (en) | 1998-12-22 | 2001-01-02 | Husky Injection Molding Systems Ltd. | Cooling device for molded articles |
US6220850B1 (en) * | 1999-02-16 | 2001-04-24 | Husky Injection Molding Systems Ltd. | Mold gate insert |
US6214275B1 (en) * | 1999-06-04 | 2001-04-10 | Husky Injection Molding Systems Ltd. | Injection nozzle and method for injection molding |
US6220891B1 (en) * | 1999-06-24 | 2001-04-24 | Zetec, Inc. | Probe connector |
-
2001
- 2001-07-06 US US09/900,083 patent/US20030008034A1/en not_active Abandoned
-
2002
- 2002-05-27 ES ES02729720T patent/ES2291468T3/en not_active Expired - Lifetime
- 2002-05-27 WO PCT/CA2002/000774 patent/WO2003004243A1/en active IP Right Grant
- 2002-05-27 EP EP02729720A patent/EP1406754B1/en not_active Expired - Lifetime
- 2002-05-27 DE DE60221845T patent/DE60221845T2/en not_active Expired - Fee Related
- 2002-05-27 AT AT02729720T patent/ATE369964T1/en not_active IP Right Cessation
- 2002-05-27 CN CNB2005100737502A patent/CN100398295C/en not_active Expired - Fee Related
- 2002-05-27 JP JP2003510234A patent/JP2004520984A/en not_active Ceased
- 2002-05-27 CN CNA028136454A patent/CN1537045A/en active Pending
- 2002-05-27 CA CA002449179A patent/CA2449179A1/en not_active Abandoned
- 2002-05-31 TW TW091111704A patent/TW590870B/en not_active IP Right Cessation
-
2003
- 2003-09-25 US US10/670,870 patent/US7037103B2/en not_active Expired - Fee Related
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US20050136151A1 (en) * | 2000-04-12 | 2005-06-23 | Mold-Masters Limited | Injection nozzle system and injection molding machine incorporating same |
US20070264386A1 (en) * | 2000-04-12 | 2007-11-15 | Mold-Masters Limited | Injection Nozzle System for an Injection Molding Machine |
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US20100310708A1 (en) * | 2001-10-03 | 2010-12-09 | Mold-Masters (2007) Limited | Nozzle for an Injection Molding Apparatus |
US20050003039A1 (en) * | 2001-10-03 | 2005-01-06 | Denis Babin | Nozzle seal for an injection molding apparatus |
US7891969B2 (en) | 2001-10-03 | 2011-02-22 | Mold-Masters (2007) Limited | Injection molding nozzle |
US20050106283A1 (en) * | 2001-10-03 | 2005-05-19 | Gheorghe Olaru | Injection molding nozzle |
US20050118298A1 (en) * | 2001-10-05 | 2005-06-02 | Denis Babin | Gap seal between nozzle components |
US20040146598A1 (en) * | 2002-02-21 | 2004-07-29 | Mold-Masters Ltd. | Valve pin guiding tip for a nozzle |
US6921259B2 (en) | 2002-02-21 | 2005-07-26 | Mold-Masters Limited | Valve pin guide for a valve-gated nozzle |
US20030235638A1 (en) * | 2002-04-12 | 2003-12-25 | Mold-Masters Limited | Mold gate insert with a thermal barrier |
US7025585B2 (en) | 2002-04-12 | 2006-04-11 | Gellert Jobst U | Mold gate insert with a thermal barrier |
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US20040071817A1 (en) * | 2002-07-30 | 2004-04-15 | Jonathon Fischer | Valve pin guidance and alignment system for an injection molding apparatus |
US20040137107A1 (en) * | 2002-11-21 | 2004-07-15 | Denis Babin | Hot runner nozzle with a tip, a tip surrounding piece and an alignment piece |
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US20050281906A1 (en) * | 2004-06-16 | 2005-12-22 | Noot Dirk V | Hot runner nozzle |
US7431580B2 (en) | 2006-01-18 | 2008-10-07 | Hon Hai Precision Industry Co., Ltd. | Mold for forming workpiece |
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US7513772B2 (en) | 2007-05-09 | 2009-04-07 | Mold-Masters (2007) Limited | Injection molding nozzle with valve pin alignment |
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EP2188102A1 (en) * | 2007-05-31 | 2010-05-26 | Alliance for business solutions A4BS | Modified hot runner system s for injection blow molding |
US20100092601A1 (en) * | 2008-10-10 | 2010-04-15 | Mold-Masters (2007) Limited | Injection Molding Valve Gated Hot Runner Nozzle |
US7972132B2 (en) | 2008-10-10 | 2011-07-05 | Mold-Masters (2007) Ltd | Injection molding valve gated hot runner nozzle |
CN102802909A (en) * | 2010-04-05 | 2012-11-28 | 赫斯基注塑系统有限公司 | Mold-tool assembly including resin-retaining device located relative to stem-tip portion |
US10899055B2 (en) * | 2014-01-08 | 2021-01-26 | Synventive Molding Solutions, Inc. | Valve pin and nozzle configuration and method of control |
US11701209B2 (en) * | 2016-09-30 | 2023-07-18 | Kobayashi Pharmaceutical Co., Ltd. | Interdental cleaning tool production method |
Also Published As
Publication number | Publication date |
---|---|
TW590870B (en) | 2004-06-11 |
CN1680085A (en) | 2005-10-12 |
ES2291468T3 (en) | 2008-03-01 |
CN100398295C (en) | 2008-07-02 |
EP1406754B1 (en) | 2007-08-15 |
WO2003004243A1 (en) | 2003-01-16 |
EP1406754A1 (en) | 2004-04-14 |
JP2004520984A (en) | 2004-07-15 |
US20040058031A1 (en) | 2004-03-25 |
US7037103B2 (en) | 2006-05-02 |
CN1537045A (en) | 2004-10-13 |
ATE369964T1 (en) | 2007-09-15 |
DE60221845D1 (en) | 2007-09-27 |
CA2449179A1 (en) | 2003-01-16 |
DE60221845T2 (en) | 2008-05-08 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
AS | Assignment |
Owner name: HUSKY INJECTION MOLDING SYSTEMS, LTD., CANADA Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:NIEWELS, JOACHIM JOHANNES;REEL/FRAME:012015/0025 Effective date: 20010705 |
|
AS | Assignment |
Owner name: HUSKY INJECTION MOLDING SYSTEMS INC., NEW YORK Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:HUSKY INJECTION MOLDING SYSTEMS LTD., A CANADIAN CORPORATION;REEL/FRAME:012915/0989 Effective date: 20020514 |
|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO PAY ISSUE FEE |