US20070210092A1 - Paper food container with injection molded top rim structure and method of manufacturing same - Google Patents
Paper food container with injection molded top rim structure and method of manufacturing same Download PDFInfo
- Publication number
- US20070210092A1 US20070210092A1 US11/704,472 US70447207A US2007210092A1 US 20070210092 A1 US20070210092 A1 US 20070210092A1 US 70447207 A US70447207 A US 70447207A US 2007210092 A1 US2007210092 A1 US 2007210092A1
- Authority
- US
- United States
- Prior art keywords
- cup
- edge
- rim structure
- container
- food container
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
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
- B29C45/14—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor incorporating preformed parts or layers, e.g. injection moulding around inserts or for coating articles
- B29C45/14336—Coating a portion of the article, e.g. the edge of the article
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D15/00—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials
- B65D15/02—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials of curved, or partially curved, cross-section, e.g. cans, drums
- B65D15/04—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials of curved, or partially curved, cross-section, e.g. cans, drums with curved, or partially curved, walls made by winding or bending paper
- B65D15/08—Containers having bodies formed by interconnecting or uniting two or more rigid, or substantially rigid, sections made of different materials of curved, or partially curved, cross-section, e.g. cans, drums with curved, or partially curved, walls made by winding or bending paper with end walls made of plastics material
-
- 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
- B29C2045/0086—Runner trees, i.e. several articles connected by a runner
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
- B29K2711/12—Paper, e.g. cardboard
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/712—Containers; Packaging elements or accessories, Packages
- B29L2031/7132—Bowls, Cups, Glasses
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T156/00—Adhesive bonding and miscellaneous chemical manufacture
- Y10T156/10—Methods of surface bonding and/or assembly therefor
- Y10T156/1002—Methods of surface bonding and/or assembly therefor with permanent bending or reshaping or surface deformation of self sustaining lamina
Definitions
- This invention relates to food containers and more particularly to a cup-shaped paper container having an open top and a plastic rim structure which is injection molded in adhering and encapsulating relationship to the top of the container sidewall so as to be capable of receiving in sealed relationship therewith a heat sealable cover.
- the invention also relates to a method of manufacturing such an article and to a method of packaging food using such an article.
- an article of manufacture in the form of a cup-shaped paper container having an open top, and a plastic rim structure injection molded to the open top so as to encapsulate and seal same, to prevent the loss or migration of moisture into the cup material and to provide a substantially flat annular seat for a heat sealable cover of foil or other suitable material.
- the paper container includes a rolled rim at the top edge of the paper cup.
- the molded plastic rim encapsulates the rolled rim and is securely fastened to the cup.
- the container has a plain, unrolled top edge, and a rim structure is injection molded to it so as to seal the edge by encapsulation and provide a flat, annular seat area above it.
- the inside edge of the side seam is scaled to prevent moisture or fatty substances from migrating into the paper.
- the attachment of the rim to the cap may be enhanced by providing a series of circumferentially-spaced holes in the cup sidewall just below the top edge. The plastic of the molded rim flows into and seals the holes in the molding process.
- an article of manufacture as described above is made by placing a paper cup having a top edge in a mold, closing the mold, and injecting into the mold a sufficient molten plastic material to form around and in encapsulating adhering relationship to the top edge, an annular rim structure having a substantially flat upper annular seating surface.
- the cup with the adhered plastic rim is thereafter removed from the mold and sent to a food processor where the cup is filled with product and sealed using a laminated foil or other material covering structure as described above.
- the invention includes not only the method of manufacturing the article, but the further and more comprehensive method of packaging food using such an article.
- FIG. 1 is a perspective view of a food container manufactured in accordance with the present invention
- FIG. 2 is a side view in section of a first embodiment of the invention
- FIG. 3 is a side view in section of a paper cup of FIG. 2 being inserted into a mold;
- FIG. 4 is a side view in section of the paper cup of FIG. 3 after insertion into the mold and injection molding a rim structure;
- FIG. 5 is a side view in section of the open mold with the cup of FIG. 2 being removed from the mold;
- FIG. 6 is a perspective view of a representative mold showing how multiple articles incorporating the principals of the present invention are simultaneously formed
- FIG. 7 is a perspective view of a second embodiment of a cup before injection molding the rim
- FIG. 8 is a side view, in section, of the cup of FIG. 7 after molding the rim structure
- FIG. 9 shows a molding step associated with the manufacture of still another embodiment of the invention.
- FIG. 10 shows a further molding step for the embodiment of FIG. 9 ;
- FIG. 11 is a perspective view of the embodiment made by the molds shown in FIGS. 9 and 10 ;
- FIG. 12 is a sectional side view of the embodiment of FIG. 11 .
- FIGS. 1 and 2 there is shown a tapered, cup-shaped paper container 10 having a glued side seam 11 and adheringly attached to the upper open end thereof an injection molded plastic rim structure 12 to which a heat sealable foil closure 14 has been attached.
- the closure 14 comprises an upper layer of metal foil and a lower layer of heat sealable plastic which is adhered to the flat top surface of the rim structure 12 by suitable heated press means (not shown).
- a lifting tab 20 is provided at the outer edge of the sealing cover 14 to assist in removing the cover 14 from the cup-shaped container 10 to provide access to the contents thereof.
- the cup-shaped container 10 is made substantially entirely of paper.
- the forming process for making paper cups is well known and involves rolling a flat blank into a frusto-conical or other shape and gluing or bonding the overlapping edges of the blank to form seam 11 .
- a paper bottom 22 is added and secured in place by a suitable adhesive.
- At least the interior surfaces of the container 10 are seal-coated so as to become substantially moisture impermeable by application of a plastic coating material selected from the group consisting of polyolefins, polyurethane and polyethylene. This is typically accomplished by coating the paper while it is still flat. When such flat material is cut to form a blank, the vertical edge which ends up on the inside of the cup is unsealed.
- cup shaped refers to cylindrical as well as tapered and reversely tapered containers.
- the upper edge of the container 10 is tightly rolled at 24 . Except for the re-sealing of the inside edge as explained above, the manufacturing steps and equipment used to produce an article as thus far described are conventional and well known. In this embodiment, the rolled edge 24 enhances the attachment of the rim structure 12 .
- a suitable injection molding apparatus 26 capable of withstanding high pressure conditions is shown to comprise tapered support surfaces 28 and 29 sized and shaped to receive and support the cup-shaped paper container 10 therein.
- the rolled rim 24 of the paper container lies within an annular upper cavity 30 in spaced relationship with all surfaces thereof.
- the mold 26 is closed by adding a high pressure cover 32 .
- a plug 35 attached to the mold cover 32 defines the inside surface of an annular mold cavity.
- the plug 35 touches the inside surface of the cup 10 and prevents plastic from flowing down the inside of the cup.
- Molten plastic material such as molten polyethylene is injected into the space between the cavity 30 and the upper, outer and lower quadrants of the rolled edge 24 . This results in the formation of the plastic rim structure 12 in adhering and surrounding relationship to the rolled edge 24 .
- the cover 32 forms a flat annular upper surface 34 on the injection molded rim structure 12 .
- the radial width of the upper surface 34 is uniform and between about 1 ⁇ 8 and 1 ⁇ 4 of an inch.
- the mold 26 is opened and the finished article consisting of paper cup 10 and upper rim structure 12 is removed.
- Rim structure 12 is now well adhered to the cup 10 and will not shift, collapse or separate from the cup even when subjected to the forces associated with the application and removal of the cover 12 .
- it provides the advantage of a substantially flush relationship with the interior surface of the cup 10 such that it is easy to fully remove the contents of the cup with a spoon or other utensil.
- FIG. 6 shows the mold 26 to comprise multiple mold cavities 36 interconnected by a runner system 38 which permits the simultaneous molding of six rim structures 12 in association with six identical paper cups 10 .
- the injector 40 for the plastic material is shown.
- a paper cup 10 ′ is constructed according to the description above except for the fact that the top edge is not rolled. Instead, a plurality of circumferentially spaced holes 42 are formed in the paper sidewall about 1 ⁇ 8 of an inch below the upper edge 44 . The holes are preferably formed in the paper blank before it is rolled into the cup shape. The inside edge of the seam 11 is also sealed as described above. The cup is inserted into a mold similar to that shown in FIGS.
- a rim structure 12 ′ having a flat annular top 48 is injection molded to the top of the cup 10 such that injected plastic flows into the holes 42 to form plugs 50 which enhance the mechanical attachment of the rim 12 ′ to the paper cup 10 .
- the edge 44 is not rolled. However, both the rolled rim 24 and the holes 42 may be used in combination if desired.
- the article shown in either FIG. 5 or FIG. 8 is manufactured, it is shipped to food processor who fills the container with a liquid, semi-liquid or dry food product. Thereafter, the container is sealed by applying the foil cover 14 to the flat annular rim surface 34 or 48 and applying a heated press or platen to the article to bond or weld the plastic under material 18 to the top surface 34 or 48 of the polyethylene rim structure 12 or 46 .
- Polyethylene is given by way of example as other injectable plastics may also be used.
- the purchaser of the food product in the container holds the container 10 in one hand and grasps the tab 20 in the other hand and peels it back to remove the cover 14 from the cup-shaped container 10 .
- the forces involved in disassociating the bonded plastic under layer from the rim structure 12 are far less than those which would be required to mechanically disassociate the rim structure 12 from the rolled rim 24 .
- the food container has the structural integrity of a full plastic article while being susceptible of manufacture at a reduced price.
- the preferred embodiment of the invention is shown to comprise a paper cup 60 having a straight, i.e., unrolled, upper edge to which a rim structure 62 has been injection molded in such a way as to encapsulate and seal the upper edge of the paper cup 60 and to provide a substantially flat and relatively wide annular seat surface 64 to receive a cover as previously described with reference to FIGS. 1 and 2 .
- Cup 60 has an edge seam 61 similar to seams 11 and 11 ′ of the previously described embodiments.
- the rim structure 62 comprises an outer leg 66 which overlies and extends down along the outer surface of the cup 60 approximately 1 ⁇ 4 to 3 ⁇ 8 of an inch.
- An inner surface 68 extends only slightly down the inside surface of the cup 60 so as to completely seal and encapsulate the upper edge of the cup 60 to prevent the ingestion of any moisture into the paper.
- the inside vertical edge in the seam 61 is sealed as described above.
- the rim structure 62 provides a flat and relatively wide annular seating surface 64 , the outside diameter of which is greater than the outside diameter of the cup 60 as shown in FIGS. 11 and 12 .
- the outside diameter of the rim 64 is also greater than the outside diameter of the outside wall portion 66 , thereby providing a neater appearance and saving on plastic relative to the embodiment of FIG. 2 . It has been found unnecessary to provide the holes as shown in FIGS. 7 and 8 to ensure a firm attachment of the rim structure 62 to the cup 60 .
- FIGS. 9 and 10 show the mold 70 which is used to manufacture the article of FIGS. 11 and 12 .
- the mold is configured at 72 to provide the shape of the rim structure 64 and the cup 60 is inserted into the mold in the manner shown.
- a top tool 74 is brought into position atop the mold 70 and fluid plastic is injection molded into the annular space between the two tools, 70 , 74 and around the top edge of the cup 60 .
- This fully encapsulates and seals the top edge of the cup and provides the rim structure previously described.
- the cup 60 with the injection molded attached rim structure 62 may thereafter be sent to a filling and sealing operation as previously described.
Abstract
A food container in the form of a paper cup having a top edge and a plastic rim structure which is injection molded to the edge so as to seal the edge and be firmly be adhered thereto. The rim structure exhibits a flat annular upper surface to which a heat sealable closure made of metal foil with heat sealable plastic underlayer can be attached after filling the container with a suitable food product.
Description
- This application is a continuation-in-part of U.S. application Ser. No. 11/372,712 filed under attorney docket no. MNI-108-A on Mar. 10, 2006, currently pending and claims priority thereto. The content of the U.S. patent Ser. No. 11/372,712 is incorporated herein by reference.
- This invention relates to food containers and more particularly to a cup-shaped paper container having an open top and a plastic rim structure which is injection molded in adhering and encapsulating relationship to the top of the container sidewall so as to be capable of receiving in sealed relationship therewith a heat sealable cover. The invention also relates to a method of manufacturing such an article and to a method of packaging food using such an article.
- It is known to provide food products such as yogurt in plastic containers having sealed foil covers. However, the price of plastic used to manufacture such containers is closely tied to the price of oil which, for a number of years has seen a steady upward trend. It is therefore desirable to use paper containers provided they can meet the requirements associated with the packaging of food products. One problem with the use of paper to hold semi-liquid and liquid products is the difficulty of attaching a heat sealable foil cover to the container. That process is best achieved with a flat annular rim around the top of the container capable of sustaining a wide range of pressures and temperatures during the product filling and sealing steps. Paper alone is not conducive to these steps. Another problem associated with the use of paper is maintaining a seal along the inside edge of the glued seam which runs from top to bottom of the cup.
- According to the first aspect of the present invention, an article of manufacture is provided in the form of a cup-shaped paper container having an open top, and a plastic rim structure injection molded to the open top so as to encapsulate and seal same, to prevent the loss or migration of moisture into the cup material and to provide a substantially flat annular seat for a heat sealable cover of foil or other suitable material.
- In one illustrative embodiment, the paper container includes a rolled rim at the top edge of the paper cup. The molded plastic rim encapsulates the rolled rim and is securely fastened to the cup.
- In another illustrative embodiment, the container has a plain, unrolled top edge, and a rim structure is injection molded to it so as to seal the edge by encapsulation and provide a flat, annular seat area above it. In addition, the inside edge of the side seam is scaled to prevent moisture or fatty substances from migrating into the paper. Optionally, the attachment of the rim to the cap may be enhanced by providing a series of circumferentially-spaced holes in the cup sidewall just below the top edge. The plastic of the molded rim flows into and seals the holes in the molding process.
- According to the second aspect of the invention, an article of manufacture as described above is made by placing a paper cup having a top edge in a mold, closing the mold, and injecting into the mold a sufficient molten plastic material to form around and in encapsulating adhering relationship to the top edge, an annular rim structure having a substantially flat upper annular seating surface. The cup with the adhered plastic rim is thereafter removed from the mold and sent to a food processor where the cup is filled with product and sealed using a laminated foil or other material covering structure as described above. Thus the invention includes not only the method of manufacturing the article, but the further and more comprehensive method of packaging food using such an article.
-
FIG. 1 is a perspective view of a food container manufactured in accordance with the present invention; -
FIG. 2 is a side view in section of a first embodiment of the invention; -
FIG. 3 is a side view in section of a paper cup ofFIG. 2 being inserted into a mold; -
FIG. 4 is a side view in section of the paper cup ofFIG. 3 after insertion into the mold and injection molding a rim structure; -
FIG. 5 is a side view in section of the open mold with the cup ofFIG. 2 being removed from the mold; -
FIG. 6 is a perspective view of a representative mold showing how multiple articles incorporating the principals of the present invention are simultaneously formed; -
FIG. 7 is a perspective view of a second embodiment of a cup before injection molding the rim; -
FIG. 8 is a side view, in section, of the cup ofFIG. 7 after molding the rim structure; -
FIG. 9 shows a molding step associated with the manufacture of still another embodiment of the invention; -
FIG. 10 shows a further molding step for the embodiment ofFIG. 9 ; -
FIG. 11 is a perspective view of the embodiment made by the molds shown inFIGS. 9 and 10 ; and -
FIG. 12 is a sectional side view of the embodiment ofFIG. 11 . - Referring to
FIGS. 1 and 2 there is shown a tapered, cup-shaped paper container 10 having a glued side seam 11 and adheringly attached to the upper open end thereof an injection moldedplastic rim structure 12 to which a heatsealable foil closure 14 has been attached. Theclosure 14 comprises an upper layer of metal foil and a lower layer of heat sealable plastic which is adhered to the flat top surface of therim structure 12 by suitable heated press means (not shown). A lifting tab 20 is provided at the outer edge of thesealing cover 14 to assist in removing thecover 14 from the cup-shaped container 10 to provide access to the contents thereof. The cup-shaped container 10 is made substantially entirely of paper. The forming process for making paper cups is well known and involves rolling a flat blank into a frusto-conical or other shape and gluing or bonding the overlapping edges of the blank to form seam 11. Apaper bottom 22 is added and secured in place by a suitable adhesive. At least the interior surfaces of thecontainer 10 are seal-coated so as to become substantially moisture impermeable by application of a plastic coating material selected from the group consisting of polyolefins, polyurethane and polyethylene. This is typically accomplished by coating the paper while it is still flat. When such flat material is cut to form a blank, the vertical edge which ends up on the inside of the cup is unsealed. To prevent liquid and fatty material from migrating into the cup material, the inside edge is re-sealed after cutting the blank from the flat paper board and before the seam 11 is formed and glued. The term “cup shaped”, as used herein, refers to cylindrical as well as tapered and reversely tapered containers. - According to a first embodiment, the upper edge of the
container 10 is tightly rolled at 24. Except for the re-sealing of the inside edge as explained above, the manufacturing steps and equipment used to produce an article as thus far described are conventional and well known. In this embodiment, the rollededge 24 enhances the attachment of therim structure 12. - Referring now to
FIGS. 3 , 4 and 5, the additional steps needed to convert thepaper cup 10 into a food product container in accordance with the present invention will be described. As shown inFIG. 3 , a suitableinjection molding apparatus 26 capable of withstanding high pressure conditions is shown to comprisetapered support surfaces shaped paper container 10 therein. When fully inserted, the rolledrim 24 of the paper container lies within an annularupper cavity 30 in spaced relationship with all surfaces thereof. - Turning now to
FIG. 4 , themold 26 is closed by adding ahigh pressure cover 32. Aplug 35 attached to themold cover 32 defines the inside surface of an annular mold cavity. Theplug 35 touches the inside surface of thecup 10 and prevents plastic from flowing down the inside of the cup. Molten plastic material such as molten polyethylene is injected into the space between thecavity 30 and the upper, outer and lower quadrants of the rollededge 24. This results in the formation of theplastic rim structure 12 in adhering and surrounding relationship to the rollededge 24. It will be noted inFIG. 4 that thecover 32 forms a flat annularupper surface 34 on the injection moldedrim structure 12. The radial width of theupper surface 34 is uniform and between about ⅛ and ¼ of an inch. - As shown in
FIG. 5 , after the injection molding process has been completed, themold 26 is opened and the finished article consisting ofpaper cup 10 andupper rim structure 12 is removed.Rim structure 12 is now well adhered to thecup 10 and will not shift, collapse or separate from the cup even when subjected to the forces associated with the application and removal of thecover 12. Moreover, it provides the advantage of a substantially flush relationship with the interior surface of thecup 10 such that it is easy to fully remove the contents of the cup with a spoon or other utensil. -
FIG. 6 shows themold 26 to comprisemultiple mold cavities 36 interconnected by a runner system 38 which permits the simultaneous molding of sixrim structures 12 in association with sixidentical paper cups 10. Theinjector 40 for the plastic material is shown. - Referring now to
FIGS. 7 and 8 , a second embodiment of the invention will be described. In this embodiment, apaper cup 10′ is constructed according to the description above except for the fact that the top edge is not rolled. Instead, a plurality of circumferentially spacedholes 42 are formed in the paper sidewall about ⅛ of an inch below theupper edge 44. The holes are preferably formed in the paper blank before it is rolled into the cup shape. The inside edge of the seam 11 is also sealed as described above. The cup is inserted into a mold similar to that shown inFIGS. 3-5 and arim structure 12′ having a flat annular top 48 is injection molded to the top of thecup 10 such that injected plastic flows into theholes 42 to form plugs 50 which enhance the mechanical attachment of therim 12′ to thepaper cup 10. In this embodiment, theedge 44 is not rolled. However, both the rolledrim 24 and theholes 42 may be used in combination if desired. - After the article shown in either
FIG. 5 orFIG. 8 is manufactured, it is shipped to food processor who fills the container with a liquid, semi-liquid or dry food product. Thereafter, the container is sealed by applying thefoil cover 14 to the flatannular rim surface material 18 to thetop surface polyethylene rim structure 12 or 46. Polyethylene is given by way of example as other injectable plastics may also be used. - The purchaser of the food product in the container holds the
container 10 in one hand and grasps the tab 20 in the other hand and peels it back to remove thecover 14 from the cup-shapedcontainer 10. The forces involved in disassociating the bonded plastic under layer from therim structure 12 are far less than those which would be required to mechanically disassociate therim structure 12 from the rolledrim 24. Thus, the food container has the structural integrity of a full plastic article while being susceptible of manufacture at a reduced price. - Referring now to
FIGS. 9-12 , the preferred embodiment of the invention is shown to comprise apaper cup 60 having a straight, i.e., unrolled, upper edge to which arim structure 62 has been injection molded in such a way as to encapsulate and seal the upper edge of thepaper cup 60 and to provide a substantially flat and relatively wideannular seat surface 64 to receive a cover as previously described with reference toFIGS. 1 and 2 .Cup 60 has an edge seam 61 similar to seams 11 and 11′ of the previously described embodiments. As best show inFIGS. 11 and 12 , therim structure 62 comprises an outer leg 66 which overlies and extends down along the outer surface of thecup 60 approximately ¼ to ⅜ of an inch. Aninner surface 68 extends only slightly down the inside surface of thecup 60 so as to completely seal and encapsulate the upper edge of thecup 60 to prevent the ingestion of any moisture into the paper. The inside vertical edge in the seam 61 is sealed as described above. Therim structure 62 provides a flat and relatively wideannular seating surface 64, the outside diameter of which is greater than the outside diameter of thecup 60 as shown inFIGS. 11 and 12 . The outside diameter of therim 64 is also greater than the outside diameter of the outside wall portion 66, thereby providing a neater appearance and saving on plastic relative to the embodiment ofFIG. 2 . It has been found unnecessary to provide the holes as shown inFIGS. 7 and 8 to ensure a firm attachment of therim structure 62 to thecup 60. -
FIGS. 9 and 10 show themold 70 which is used to manufacture the article ofFIGS. 11 and 12 . The mold is configured at 72 to provide the shape of therim structure 64 and thecup 60 is inserted into the mold in the manner shown. Once inserted, atop tool 74 is brought into position atop themold 70 and fluid plastic is injection molded into the annular space between the two tools, 70, 74 and around the top edge of thecup 60. This fully encapsulates and seals the top edge of the cup and provides the rim structure previously described. Thecup 60 with the injection molded attachedrim structure 62 may thereafter be sent to a filling and sealing operation as previously described. - While the invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not to be limited to the disclosed embodiments but, on the contrary, is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims, which scope is to be accorded the broadest interpretation so as to encompass all such modifications and equivalent structures as is permitted under the law.
Claims (11)
1. A food container comprising:
a cup-shaped paper container having an open top terminating in an annular edge;
a plastic rim structure injection-molded in sealing relationship to and over the edge and providing a substantially flat annular upper surface.
2. The food container article of claim 1 , further including an impermeable coating material on the interior of the cup selected from the group consisting of polyolefins, polyurethane, and polyethylene.
3. The food container article of claim 1 further including a heat-sealed foil cover.
4. A food container as defined in claim 1 wherein the edge of the paper cup is rolled.
5. A food container as defined in claim 1 wherein the edge of the cup is straight and a plurality of circumferentially spaced holes are formed in the cup below the edge such that the plastic rim structure fills said holes.
6. A food container as defined in claim 1 , wherein the cup edge is straight, and the rim structure comprises a first wall extending down and overlying the outside surface of the cup, and a thin but relatively rigid annular top rim overlying the cup edge but of greater outer diameter than the cup.
7. A food container as defined in claim 6 wherein the rim structure extends sealingly over the edge and into the interior of the cup.
8. A method of manufacturing a food container comprising the steps of:
forming a cup shaped paper container having a top edge and a side seam;
placing the paper container into a mold;
injection molding a plastic rim structure around the top edge so as to adhere to and substantially encapsulate the edge while providing a substantially flat annular upper surface; and
removing the cup-shaped paper container with the injection molded plastic rim structure adhered thereto from the mold.
9. The method of claim 8 further including the step of enhancing the mechanical attachment of the rim structure to the cup.
10. The method of claim 8 including the further step of sealing the inside edge of the side seam.
11. A method of packaging a food product comprising the steps of:
(a) manufacturing a container according to the steps of claim 8 and, thereafter,
(b) filling the container with a food product; and
(c) applying a heat-sealable cover to the flat annular upper surface of the injection molded rim structure.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/704,472 US20070210092A1 (en) | 2006-03-10 | 2007-02-08 | Paper food container with injection molded top rim structure and method of manufacturing same |
US12/630,266 US7968033B2 (en) | 2006-03-10 | 2009-12-03 | Paper food container with injection molded top rim structure and method of making same |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US11/372,712 US7520404B2 (en) | 2006-03-10 | 2006-03-10 | Paper food container with injection molded top rim structure and method of manufacturing same |
US11/704,472 US20070210092A1 (en) | 2006-03-10 | 2007-02-08 | Paper food container with injection molded top rim structure and method of manufacturing same |
Related Parent Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/372,712 Continuation-In-Part US7520404B2 (en) | 2006-03-10 | 2006-03-10 | Paper food container with injection molded top rim structure and method of manufacturing same |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/630,266 Continuation US7968033B2 (en) | 2006-03-10 | 2009-12-03 | Paper food container with injection molded top rim structure and method of making same |
Publications (1)
Publication Number | Publication Date |
---|---|
US20070210092A1 true US20070210092A1 (en) | 2007-09-13 |
Family
ID=46327251
Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/704,472 Abandoned US20070210092A1 (en) | 2006-03-10 | 2007-02-08 | Paper food container with injection molded top rim structure and method of manufacturing same |
US12/630,266 Expired - Fee Related US7968033B2 (en) | 2006-03-10 | 2009-12-03 | Paper food container with injection molded top rim structure and method of making same |
Family Applications After (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US12/630,266 Expired - Fee Related US7968033B2 (en) | 2006-03-10 | 2009-12-03 | Paper food container with injection molded top rim structure and method of making same |
Country Status (1)
Country | Link |
---|---|
US (2) | US20070210092A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010018309A1 (en) * | 2008-08-12 | 2010-02-18 | Stora Enso Oyj | Mould system for manufacturing a container |
USD757537S1 (en) | 2014-12-11 | 2016-05-31 | 2266170 Ontario Inc. | Capsule |
USD778157S1 (en) | 2015-04-13 | 2017-02-07 | 2266170 Ontario Inc. | Capsule |
US10351308B1 (en) | 2016-09-22 | 2019-07-16 | Lidworks, Co. | Disposable cup lid |
US10589918B2 (en) * | 2008-02-05 | 2020-03-17 | The Hillshire Brands Company | Microwaveable product |
US10940980B1 (en) | 2016-09-22 | 2021-03-09 | Lidworks, Co | Disposable cup lid |
US11472614B2 (en) | 2016-09-22 | 2022-10-18 | Lidworks, Co. | Disposable cup lid |
Families Citing this family (18)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
BRPI0601188B1 (en) * | 2005-04-15 | 2018-06-26 | Seda S.P.A. | ISOLATED CONTAINER; METHOD OF MANUFACTURING THE SAME AND APPARATUS FOR MANUFACTURING |
CA2819617C (en) | 2010-12-10 | 2019-10-01 | Dixie Consumer Products Llc | Lid adapter |
US8998030B2 (en) | 2011-02-07 | 2015-04-07 | Berry Plastics Corporation | Package with lid sealing system |
US9469445B2 (en) | 2011-02-07 | 2016-10-18 | Berry Plastics Corporation | Package with lid sealing system |
WO2012174568A2 (en) | 2011-06-17 | 2012-12-20 | Berry Plastics Corporation | Process for forming an insulated container having artwork |
WO2012174422A2 (en) * | 2011-06-17 | 2012-12-20 | Berry Plastics Corporation | Insulated container with molded brim |
US9032698B2 (en) | 2011-07-07 | 2015-05-19 | Berry Plastics Corporation | Package with lid sealing system |
US8991632B2 (en) | 2011-07-07 | 2015-03-31 | Berry Plastics Corporation | Canister |
KR20140059255A (en) | 2011-08-31 | 2014-05-15 | 베리 플라스틱스 코포레이션 | Polymeric material for an insulated container |
US8601870B2 (en) * | 2011-12-01 | 2013-12-10 | Jack Cogan | Measuring cup |
TWI657977B (en) | 2012-08-22 | 2019-05-01 | Ptm Packaging Tools Machinery Pte. Ltd. | Paper-based container lids and methods for making the same |
US9725202B2 (en) * | 2013-03-14 | 2017-08-08 | Berry Plastics Corporation | Container |
WO2014179287A1 (en) | 2013-05-03 | 2014-11-06 | Berry Plastics Corporation | Container closure |
US20140374423A1 (en) * | 2013-05-24 | 2014-12-25 | Shuang Chieh Kui | Storage container |
US9562140B2 (en) | 2013-08-16 | 2017-02-07 | Berry Plastics Corporation | Polymeric material for an insulated container |
WO2015112741A1 (en) | 2014-01-22 | 2015-07-30 | Berry Plastics Corporation | Package with peelable closure |
WO2016014825A1 (en) | 2014-07-23 | 2016-01-28 | Berry Plastics Corporation | Package with peelable closure |
US11091311B2 (en) | 2017-08-08 | 2021-08-17 | Berry Global, Inc. | Insulated container and method of making the same |
Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4238047A (en) * | 1979-10-04 | 1980-12-09 | Container Corporation Of America | Composite closure member |
US4346832A (en) * | 1977-06-24 | 1982-08-31 | Werner Jack R | Snap-lock container |
US5156273A (en) * | 1992-04-28 | 1992-10-20 | Empak, Inc. | Stackable composite lid and container arrangement |
US5647501A (en) * | 1995-06-19 | 1997-07-15 | Double "H" Plastics, Inc. | Composite lid for container |
US5911334A (en) * | 1997-11-03 | 1999-06-15 | Double "H" Plastics, Inc. | Closable arrangement including resealable lid |
US6053353A (en) * | 1999-02-19 | 2000-04-25 | Double "H" Plastics, Inc. | Composite container closure |
US6196451B1 (en) * | 1999-10-13 | 2001-03-06 | Double “H” Plastics, Inc. | Paper-sided composite lid |
US6471083B1 (en) * | 1999-10-21 | 2002-10-29 | Double “H” Plastics, Inc. | Induction-sealed composite container end closure |
US6516548B2 (en) * | 2001-01-22 | 2003-02-11 | Quick Point, Inc. | Injection molded container and process for making same |
US6523713B1 (en) * | 1999-12-14 | 2003-02-25 | Double “H” Plastics, Inc. | Stackable hinged container lid having detents |
US20030192891A1 (en) * | 2002-04-10 | 2003-10-16 | Ziegler Scott W. | Paper cup sip adaptor |
US20040105917A1 (en) * | 2002-01-16 | 2004-06-03 | Mannion Jeffrey T. | Suspended containers |
US20040262322A1 (en) * | 2002-03-15 | 2004-12-30 | Middleton Scott William | Container having a rim or other feature encapsulated by or formed from injection-molded material |
US20060021988A1 (en) * | 2004-07-27 | 2006-02-02 | Weidenhammer Packaging Lp | Rings and containers for packaging |
Family Cites Families (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6096234A (en) * | 1983-06-15 | 1985-05-29 | 伊藤 健一 | Ultrasonic diagnostic apparatus |
GB2171046A (en) * | 1985-02-14 | 1986-08-20 | Metal Box Plc | Containers |
US6253713B1 (en) * | 1999-10-05 | 2001-07-03 | Ford Global Technologies, Inc. | Pet restraint system |
-
2007
- 2007-02-08 US US11/704,472 patent/US20070210092A1/en not_active Abandoned
-
2009
- 2009-12-03 US US12/630,266 patent/US7968033B2/en not_active Expired - Fee Related
Patent Citations (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4346832A (en) * | 1977-06-24 | 1982-08-31 | Werner Jack R | Snap-lock container |
US4238047A (en) * | 1979-10-04 | 1980-12-09 | Container Corporation Of America | Composite closure member |
US5156273A (en) * | 1992-04-28 | 1992-10-20 | Empak, Inc. | Stackable composite lid and container arrangement |
US5647501A (en) * | 1995-06-19 | 1997-07-15 | Double "H" Plastics, Inc. | Composite lid for container |
US5911334A (en) * | 1997-11-03 | 1999-06-15 | Double "H" Plastics, Inc. | Closable arrangement including resealable lid |
US6053353A (en) * | 1999-02-19 | 2000-04-25 | Double "H" Plastics, Inc. | Composite container closure |
US6196451B1 (en) * | 1999-10-13 | 2001-03-06 | Double “H” Plastics, Inc. | Paper-sided composite lid |
US6471083B1 (en) * | 1999-10-21 | 2002-10-29 | Double “H” Plastics, Inc. | Induction-sealed composite container end closure |
US6523713B1 (en) * | 1999-12-14 | 2003-02-25 | Double “H” Plastics, Inc. | Stackable hinged container lid having detents |
US6516548B2 (en) * | 2001-01-22 | 2003-02-11 | Quick Point, Inc. | Injection molded container and process for making same |
US20040105917A1 (en) * | 2002-01-16 | 2004-06-03 | Mannion Jeffrey T. | Suspended containers |
US20040262322A1 (en) * | 2002-03-15 | 2004-12-30 | Middleton Scott William | Container having a rim or other feature encapsulated by or formed from injection-molded material |
US20030192891A1 (en) * | 2002-04-10 | 2003-10-16 | Ziegler Scott W. | Paper cup sip adaptor |
US20060021988A1 (en) * | 2004-07-27 | 2006-02-02 | Weidenhammer Packaging Lp | Rings and containers for packaging |
Cited By (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US10589918B2 (en) * | 2008-02-05 | 2020-03-17 | The Hillshire Brands Company | Microwaveable product |
WO2010018309A1 (en) * | 2008-08-12 | 2010-02-18 | Stora Enso Oyj | Mould system for manufacturing a container |
US20100295209A1 (en) * | 2008-08-12 | 2010-11-25 | Paivi Maatta | Mould system for manufacturing a container |
US8545203B2 (en) | 2008-08-12 | 2013-10-01 | Stora Enso Oyj | Mould system for manufacturing a container |
RU2507067C2 (en) * | 2008-08-12 | 2014-02-20 | Стора Энсо Ойй | Mould for container moulding |
USD757537S1 (en) | 2014-12-11 | 2016-05-31 | 2266170 Ontario Inc. | Capsule |
USD776525S1 (en) | 2014-12-11 | 2017-01-17 | 2266170 Ontario Inc. | Capsule |
USD778157S1 (en) | 2015-04-13 | 2017-02-07 | 2266170 Ontario Inc. | Capsule |
USD826054S1 (en) | 2015-04-13 | 2018-08-21 | 2266170 Ontario Inc. | Capsule |
US10351308B1 (en) | 2016-09-22 | 2019-07-16 | Lidworks, Co. | Disposable cup lid |
US10940980B1 (en) | 2016-09-22 | 2021-03-09 | Lidworks, Co | Disposable cup lid |
US11472614B2 (en) | 2016-09-22 | 2022-10-18 | Lidworks, Co. | Disposable cup lid |
Also Published As
Publication number | Publication date |
---|---|
US20100147447A1 (en) | 2010-06-17 |
US7968033B2 (en) | 2011-06-28 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US7968033B2 (en) | Paper food container with injection molded top rim structure and method of making same | |
US7520404B2 (en) | Paper food container with injection molded top rim structure and method of manufacturing same | |
CN104136346B (en) | aerosol container | |
CA2071938C (en) | Container closure and method for producing same | |
EP0140282B2 (en) | Can-like container and method for manufacturing same | |
CN105658531A (en) | An opening device for a container and a method for producing such opening device | |
WO2011126046A1 (en) | Container main body and process for production thereof, and packaging container | |
JP4220044B2 (en) | Injection mold container for microwave oven | |
JP4270621B2 (en) | Retort injection molded container | |
WO2015097604A1 (en) | A package for food products | |
US6845902B1 (en) | Flat gable composite packing provided with a resealable spout and procedure for its manufacture | |
JP5515470B2 (en) | Paper cup container | |
JP6463058B2 (en) | Resealable sealed container | |
CN104039660B (en) | For the closing cap with multi-layer sealed dish of container | |
JP2599936Y2 (en) | Packaging container | |
JPS6226889B2 (en) | ||
JPS6326025B2 (en) | ||
CA2506902C (en) | Retort container, and hot melt adhesive therefor | |
JP4655396B2 (en) | Manufacturing method of cup-shaped container | |
JP4140096B2 (en) | Pressure-resistant paper container | |
JPS6038492Y2 (en) | Paper containers with sealing, easy opening, and re-closing functions | |
JP2571569B2 (en) | Easy-open sealed container with drop lid for container | |
JP2004345300A (en) | Method for manufacturing high barrier plastic cup-like container | |
JPH1024919A (en) | Cup-like composite container | |
JP3397504B2 (en) | Container with seal lid |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |