US3499572A - Easy-opening structure having a welded weakening line - Google Patents

Easy-opening structure having a welded weakening line Download PDF

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Publication number
US3499572A
US3499572A US719503A US3499572DA US3499572A US 3499572 A US3499572 A US 3499572A US 719503 A US719503 A US 719503A US 3499572D A US3499572D A US 3499572DA US 3499572 A US3499572 A US 3499572A
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Prior art keywords
mold
annular
panel
tear
cavity
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US719503A
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English (en)
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Herbert S Ruekberg
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Continental Can Co Inc
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Continental Can Co Inc
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    • 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
    • B29C45/46—Means for plasticising or homogenising the moulding material or forcing it into the mould
    • B29C45/56—Means for plasticising or homogenising the moulding material or forcing it into the mould using mould parts movable during or after injection, e.g. injection-compression moulding
    • 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
    • B29C45/0081—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor of objects with parts connected by a thin section, e.g. hinge, tear line
    • 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
    • B29L2031/56—Stoppers or lids for bottles, jars, or the like, e.g. closures
    • B29L2031/565—Stoppers or lids for bottles, jars, or the like, e.g. closures for containers

Definitions

  • This invention relates to improvements in articles which are designed to have openings formed therein for numerous purposes, and more particularly to container structures such as but not limited to, can ends, crown caps, closures, container bodies, etc. which are constructed entirely from synthetic plastic material in such a manner that the conventional score line between a tear-out panel and a remaining portion of the container structures is eliminated.
  • container structures such as but not limited to, can ends, crown caps, closures, container bodies, etc. which are constructed entirely from synthetic plastic material in such a manner that the conventional score line between a tear-out panel and a remaining portion of the container structures is eliminated.
  • the various components of this invention are provided with a rupturable weld line of fused material which is inherently weaker than remaining material and sets-off a removable or fracturable panel from a remaining portion of the components.
  • a rupture occurs along the weld line to elfect, for example, the formation of an opening through which products may be dispensed or, in the case of crown closures, the entire removal of the closure from an associated bottle or similar container.
  • an easy-opening can end which is constructed entirely of metallic material, such as tin plate, aluminum, etc.
  • a continuous score line is formed generally in an upper surface of the can end to define a removable or at least partially removable tear-out panel.
  • An apertured pull tab which is also generally constructed from metallic material is separately united to the tearout panel by an upset rivet, a weld or similar conventional securing means.
  • Such conventional can ends have met with a relatively high degree of success particularly in the packaging of pressurized or gas-generating products.
  • crown closures which can be removed by partially or entirely removing an integral pull tab which is generally simply an extension of the peripheral skirt of the crown closure.
  • a pair of score lines extend from the gripping portion of the crown closure upwardly along the peripheral skirt and partially or completely across the end panel and down the opposite side of the skirt.
  • the crown closure is removed by simply grasping and pulling the tear strip and subsequently removing the closure from its associated container.
  • metallic crown closures have met with a relatively high degree of success but among several disadvantages the most serious are cases of persons being cut by the ragged edges during the removal of the tear strip. Just as common are the numerous cases of persons cutting their feet by stepping upon such discarded closures, particularly at beaches.
  • the invention encompasses all structures formed of synthetic thermoplastic material which inoperation or use desirably or necessarily require the removal of a panel from a wall of the particular article.
  • One such example is the construction of electrical junction boxes provided with numerous popout plugs which are selectively removed for receiving electrical wires.
  • articles of the type heretofore described are formed by a novel method which includes injecting thermopalstic material into a mold cavity such that a first portion of the thermoplastic material is at least partially inboard of a second portion of the thermoplastic material with adjacent edges of the portions in contiguous relationship. These edges are thereafter flash-fused to each other at elevated temperature and pressure thereby forming an inherently weak weld line at the fused edges upon the setting thereof when the material has been cooled.
  • the first and second portions of the thermoplastic material may be introduced into the mold cavity by injecting a single stream of thermoplastic material into the cavity and subsequently dividing the same into the first and second portions, or by injecting plural streams into the cavity to form the thermoplastic article.
  • the specific article which is molded by the novel method of this invention will, of course, vary upon the particular configuration of the mold cavity and may be, for example, any one of the articles heretofore described.
  • FIGURE 1 is a top plan view of a novel one-piece easy opening container structure constructed in accordance with this invention, and illustrates a can end having a weak circular weld line joining a tear-out panel and an integral pull tab to a remaining annular portion of the can end.
  • FIGURE 2 is an enlarged fragmentary sectional view taken generally along line 22 of FIGURE 1, and more clearly illustrates the construction of the weld line.
  • FIGURE 3 is a schematic sectional view taken through the axis of a mold in which the can end of FIGURES 1 and 2 is formed, and illustrates relatively movable mold bodies defining a central circular cavity and an outer annular cavity joined to each other along a narrow annular gap.
  • FIGURE 4 is an enlarged fragmentary sectional view of the encircled portion of FIGURE 3 and illustrates thermoplastic material in the cavities just as it is about to flash across and/ or into the annular gap.
  • FIGURE 5 is a fragmentary sectional view similar to FIGURE 4, and illustrates the formation of the weld line by the intermingling and fusion of the thermoplastic material in, and/or adjacent the annular gap.
  • FIGURES 6 through 8 are enlarged fragmentary sectional views of can ends identical to the can end of FIG- URES 1 and 2, except for the particular cross-sectional configuration of the can ends in the areas of the weld line.
  • FIGURE 9 is a top perspective view of another can end constructed in accordance with this invention, and illustrates a discontinuous weld line between a central tear-out panel and a remaining annular peripheral portion of the can end.
  • FIGURE is an enlarged sectional view taken generally along line 10-10 of FIGURE 9, and more clearly illustrates the cross-sectional configuration of the can end.
  • FIGURE 11 is a bottom view with parts broken away for clarity of a mold in which the can end of FIGURES 9 and 10 is formed, and illustrates a single stream of thermoplastic material being introduced into a mold cavity and divided into two portions which ultimately flash reunite to form the can end of FIGURES 9 and 10
  • FIGURE 12 is an enlarged fragmentary sectional view taken generally along line 12-12 of FIGURE 11, and more clearly illustrates the components of the mold and the configuration of the cavity defined thereby.
  • FIGURE 13 is a schematic sectional view taken through the axis of a mold similar to the mold of FIG- URE 3, and illustrates a vertical annular gap between axially offset mold cavities.
  • FIGURE 14 is an enlarged fragmentary sectional view of the encircled portion of FIGURE 13, and illustrates thermoplastic material in the cavities just as it is about to flash across and/ or into the annular gap.
  • FIGURE 15 is a fragmentary sectional view similar to FIGURE 14, and illustrates the formation of the weld line by the intermingling and fusion of the thermoplastic material in, and/or adjacent the annular gap.
  • FIGURE 16 is a fragmentary sectional view of a mold similar to the mold of FIGURE 13, and illustrates a pair of mold bodies provided with frusto-conical surface portions which assure axial alignment of the mold bodies and concentricity of the mold cavities in the closed position thereof to impart perfect concentricity to a score line of a closure molded therein.
  • FIGURE 17 is a fragmentary sectional view of the mold of FIGURE 16, and illustrates the. frusto-conical surface portions in mating relationship in the closed position of the mold bodies.
  • FIGURE 18 is a fragmentary sectional view taken generally along line 1818 of FIGURE 17, and illustrates a pair of concentrically aligned circular ribs of the upper and lower mold bodies between which is defined an annular vertical gap within which is formed a score line of a closure formed in the mold.
  • FIGURE 19 is an enlarged fragmentary sectional view of the encircled portion of FIGURE 17, and illustrates the particular configuration of the socre line of the closure formed in the mold of FIGURES 16 through 18.
  • FIGURES 1 and 2 of the drawings A novel and preferred embodiment of an easy-opening container structure constructed in accordance with this invention is fully illustrated in FIGURES 1 and 2 of the drawings, and is generally designated by the reference numeral 10.
  • the container structure 10 is exemplified as a can end, although it is to be understood that the invention is directed to all types of easy-opening structures and is not to be considered limited by reference thereto as can ends, crown caps, closures, reclosure caps, etc., but encompasses each and every one and other such structures.
  • the container structure 10 includes an end panel (unnumbered) which is of a generally perfectly circular configuration, and is defined by an outer annular portion 11, a central portion 12 of a circular configuration, and a web 9 of reduced thickness in or adjacent to which is a circular weld line 13 formed of fused material of the panel portions 11 and 12 as will be apparent more fully hereafter.
  • the weld line 13 is similar to what is conventionally termed a score line since it is adapted to be ruptured to remove the tear-out panel 12 from the remainder of the can end 10.
  • weld line 13 is an area formed by the intermingling and fusion of streams of flowing plastic which flash-unite at the web 9 between the portions 11, 12 as will be more fully apparent hereinafter during the description of the method of forming .4 the can end 10.
  • the bond strength of the weld line 13 is appreciably weaker than the strength of remaining portions of the can end 10 due to the inherent weakness of the fused material of the two portions of plastic material which in effect forms a weakened score line in the absence of a conventional score, groove, or similar post-weakening as in conventional can ends although in accordance with the invention the thickness of the material at the weld line 13 is preferably reduced as compared to remaining portions to augment or facilitate the desired tearing action.
  • the can end 10 also includes an integral pull tab 14 having a ribbed gripping end portion 15 and an opposite end portion (unnumbered) joined by an upstanding neck 16 to the tear-out panel 12. In order to remove the panel 12 the end portion 15 is gripped and pulled in a conventional manner.
  • FIGURES 3 through 5 of the drawings illustrate the manner in which the can end 10 is injection molded in a mold 25.
  • the mold 25 includes a pair of relatively movable mold bodies 26, 27, the latter of which is carried by a movable platen of an injection molding machine, and the former of which is defined by a central portion 22 and an encircling annular portion 23 between which is defined an annular venting chamber 24 connected by one or more ports 29 to a conventional vacuum source (not shown).
  • the platen which carries the mold body 27 is reciprocated in a conventional manner to open and close a cavity 33 defined between the mold bodies 26, 27.
  • the cavity 33 is defined by opposed annular surfaces 43, 44, and opposed central circular surfaces 47, 48 between which is an annular rib 50 of the mold body 27 which forms an annular gap 51 (FIGURE 4).
  • the surfaces thereby define an annular chamber 52 (FIGURE 4) joined by the narrower annular gap 51 to a central circular chamber 53 which respectively form the portions 11, 9 and 12 of the can end 10 as will be more apparent hereafter.
  • Three gates 54, 55 and 56 regulated by valves V through V respectively, are in fluid communication with the cavity 33, and with an injection cylinder (not shown) of a conventional construction by conduit means 57.
  • thermoplastic material such as polyethylene, polystyrene, etc.
  • heated flowable synthetic thermoplastic material such as polyethylene, polystyrene, etc.
  • air is evacuated from the cavity 33 via the minute annular gap between the circumferential opposing surfaces of the mold portions 22, 23 above the venting chamber 24, the venting chamber 24 itself, and the port 29 which is connected to a suitably valved vacuum source (not shown), such as a pump.
  • a suitably valved vacuum source not shown
  • the purpose of evacuating the air from the cavity 33 is to prevent the trapping of air between the two portions of the plastic material as they flow toward each other, as will be more apparent immediately hereafter, although in some cases the evacuation of the air is unnecessary.
  • the annular gap 51 is shown exaggerated in its depth in FIGURE 4 and is in fact of a depth which prevents the plastic material from flashing across or filling the gap 51 until both chambers 52, 53 are completely filled.
  • the pressure continues to build up in the chambers 52, 53 until it is sufficient to cause the plastic material to flash into and/or through the gap 51, as indicated by the opposed unnumbered headed arrows in FIGURE 5.
  • thermoplastic material in the chambers 52, 53 to satisfactorily unite, commingle and fuse forming the weld line 13 at, in or immediately adjacent the thinner web 9 joining the panels 11, 12 (FIGURE).
  • the significance of this method is controlling the flow of the thermoplastic material such that the weld line (the line of weakness formed where at least two streams of plastic material meet and fuse) is formed at the gap 51 forming the web 9 surrounding the tear panel 12, thereby rendering the panel 12 readily removable because of the thinner web of material joining the panels 11, 12 and the location of the weld line 13 thereat.
  • FIGURES 4 and 5 By comparing FIGURES 4 and 5 it will be noted that the chambers 52, 53 and the gap 51 are axially shorter in FIGURE 4 as compared to FIGURE 5. This change in the dimensions of the chambers and gap is caused by the pressure build up after the chambers 52, 53 are completely filled which causes the mold body 27 and/or the platen carrying the same to move as indicated in FIGURE 5. It is pointed out that it is not necessary for the mold bodies 26, 27 to shift axially relative to each other to force the plastic material into the gap 51. However, with such movement the gap 51 may be initially (FIGURE 4) so small as to prevent the plastic material from entering, or may in fact be completely closed to prevent irregular or indiscriminate flashing into the gap until such time as the chambers 52, 53 are, in fact, completely filled.
  • FIGURES 6 through 8 of the drawings illustrate identically injection molded can ends differing only in the particular configuration thereof in the area of the weld lines.
  • a can end is basically identical to the can end 10 in the sense that it includes an outermost annular panel 61, a central circular tear-out panel 62 and a weld line 63 joining the panels 61, 62.
  • the can end 60 is formed in a mold which is provided with two opposed circular ribs which form concentric circular grooves 64, 65 in opposite surfaces of the can end between which lies the weld line 63 of fused or flash welded material from both portions 61, 62.
  • a pull tab (not shown) molded integrally with or separately connected to the tear-out panel 62 the latter can be removed with relative ease as the weld line 63 ruptures in the manner heretofore described relative to the can end 10.
  • FIGURE 7 Another can end is illustrated in FIGURE 7 and includes an outer annular panel 71 and a central circular panel 72 joined together by a horizontal web 73 which includes the fused material. Adjacent annular portions 74, 75 are molded to a somewhat bulbous configuration by an appropriately contoured mold cavity which also forms annular concentric grooves 76, 77 in opposite surfaces of the can end 70.
  • a can end 80 of FIGURE 8 includes an outermost annular panel 81, a central circular tear-out panel 82 and an annular web of material which is defined by a web 83 of flash material. Due to the particular configuration of the mold cavities (not shown) in which the can end 80 is injection molded, the annular portion 81 is provided with an upwardly directed annular bead 84 which merges with an upwardly opening annular groove 85 which is in turn disposed in concentric relationship to a downwardly opening annular groove 86.
  • the can ends heretofore described are each particularly adapted to have their associated tear-out panels completely removed to gain access to a product packaged within a container to which the can ends are secured.
  • FIGURES 9'and 10 also includes an outer generally annular panel or portion 111 and a central generally circular tear-out panel 112, the latter two panels being joined to each other along a weld line 113 which is generally of an annular configuration but terminates at ends 114, 115 between which is an area of material 116 forming a bridge between the panels 111, 112. Assuming a pull tab is joined to the tear-out panel 112 diametrically opposite to the area 116 a pull on the tab would progressively rupture the weld line 113 "to but not beyond the ends 114, 116. In this manner the tear-out panel 112 may be swung back to the position illustrated in FIGURE 9 for reclosure purposes.
  • FIGURES 11 and 12 illustrate a mold 120 having a cavity 121 defined by opposite surfaces (unnumbered) of mold bodies 122, 123.
  • the mold body 122 includes a downwardly directed generally circular rib 124 (FIGURE 11) having ends 125, 126 between which is defined a radial passage 127 joining a centermost cavity portion 128 of the cavity 121 with an outermost annular portion 130.
  • a gate 131 is in alignment with the passage 127 and is connected by a conduit 133 to a conventional injection cylinder (not shown).
  • the mold 120 is also provided with an annular venting chamber 129 disposed between mold portions 123a, 123b of the mold body 123.
  • the singular stream issuing from the gate 131 divides into two portions as indicated by the unnumbered headed arrows in FIGURE 11.
  • One portion of the stream begins filling the annular cavity portion while the portion of the stream passing through the passage 127 begins filling the cavity portion 128.
  • both portions 128, 130 are substantially filled the pressure of the thermoplastic material causes the two portions of the plastic material to flash across the gap defined by the undersurface of the rib 124 and the opposing surface of the mold body 123 thereby forming the fused or merged weld line 113.
  • the mold bodies 122, 123 are opened and the can end is removed.
  • the webs of the fused material are disposed in planes generally normal to the axis of the can ends and parallel to a plane taken through the can ends.
  • a mold for forming a can end of the aforementioned type is generally designated by the reference numeral and includes a pair of relatively movable mold bodies 156,
  • a pair of springs 161, 162 encircling respective bolts 163, 164 normally urge the mold body 157 to the position illustrated in FIGURE 13.
  • a cylindrical portion 159 of the mold body 157 is in the closed position of the mold bodies 156, 157 at all times in contact with a cylindrical surface 169 of the mold body 156 whereby cocking or canting of the mold bodies is prevented during an injection operation.
  • the mold body 156 is defined by a central portion 165 and an encircling annular portion 166 between which is defined an annular venting chamber 167 connected by one or more ports 168 to a conventional vacuum source (not shown).
  • the housing 158 and the mold body 157 carried thereby is reciprocated in a conventional manner to open and close a cavity 170 defined between the mold bodies 156, 157.
  • the cavity 170 is defined by opposed annular surfaces 171, 172, opposed circumferential surfaces 173, 174 (FIGURE 14) and opposed central circular surfaces 175, 176.
  • the surfaces 171, 172 thereby define a generally annular chamber 177 joined by an annular gap 178 between the surfaces 173, 174 to a chamber 180* between the surfaces 175, 176.
  • Three gates 181 through 183 regulated by valves V4 through V6, respectively, are in fluid communication with the cavity 170, and with an injection cylinder (not shown) of a conventional construction by conduit means 184.
  • thermoplastic material is pressureinjected into the chambers 177, 180 until the same are substantially filled, as shown in FIGURE 14.
  • -these same chambers are evacuated through the minute annular gap between the circumferential opposing surfaces of the mold portions 165, 166 above the venting chamber 167, the venting chamber itself, and the port 168 to again prevent the entrapment of air within the annular gap 178.
  • the pressure continues to build up causing the mold body 157 to move away from the mold body 156 against the force of the springs 161, 162 until the pressure is suflicient to cause the plastic material to flash into and/ or through the annular gap 178, as shown in FIG- URE 15.
  • the mold body 156 cannot cock or cant or shift the mold cavity axes because of the contact between the cylindrical portion 159 and the mating surface 169.
  • FIGURES 14 and 15 By comparing FIGURES 14 and 15, it will be noted that the chambers 177, 180 are deeper and that the gap 178 is axially shorter in FIGURE 15 than in FIGURE 14.
  • This change in the dimensions of the chambers and gap may, if desired, be varied by adjusting the spring tension of the springs 161, 162 to vary the length of the web of fused material to alter the opening characteristics of the finally finished can end.
  • a like spring bias construction of the mold 25 may be provided for providing axial movement between the mold bodies 26, 27 in the manner heretofore described for in the latter case varying the thickness of the weld line, as opposed to varying the length thereof in accordance with the practice schematically illustrated in FIGURES 13 and 15 of the drawings.
  • each score line of each of the closures heretofore described is of a commercially repetitive construction commercialwise, namely, each score line must be of a uniform thickness in order that a predetermined opening force can be applied to consistently fracture each closure.
  • a mold 180a of FIGURES 16 through 18 has been provided, and includes a pair of relatively movable mold bodies 181a, 182a which are of a construction similar to the mold bodies 26, 27, respectively, of the mold 25 of FIGURE 3.
  • the mold bodies 181a,182a are provided with respective ribs 183a, 184a between which is formed a vertical annular gap 185a (FIGURE 19) in the closed position of the mold 180a.
  • the ribs 183a, 184a are in perfect concentricity due to a pair of generally frustoconical tapered surfaces 186a, 187a (FIGURES l6 and 17) of the respective mold bodies 181a, 182a.
  • the ribs 183a, 184a are maintained in exact concentric uniform thickness T (FIGURE 19) of score lines formed from one casting to the next.
  • T thickness of score line
  • valve V V of FIGURE 3 An alternate method to assure that the fusions or Welding which produces the various weld lines will occur at or immediately adjacent the annular gaps, for example, is by sequential injection molding.
  • the valves V V of FIGURE 3 temporarily closed the valve V is opened and the chamber 53 is completely filled using enough pressure to fill without the material flashing through the gap 51.
  • the valves V and V are opened to fill the chamber 52 with suflicient pressure to flash through the gap 51 and Weld with the periphery of the material in the chamber 53. It may, of course, be desirable to sequentially injection mold articles in the opposite manner by first filling the chamber 52 and thereafter filling the chamber 53 with sufiicient pressure to flash through the gap 51.
  • both cavity portions 128, would therefore be completely closed during the injection of the plastic material therein and would only open after complete filling by, for example, suitably regulating springs or other means to open beyond the pressure necessary to completely fill the closed cavity chambers, thereby effecting precise flash fusion of both streams of material at the desired instant.
  • An article of manufacture comprising a tear portion and a remaining portion, said tear portion being welded to said remaining portion by a rupturable weld line of fused material of said tear and remaining portions, and said weld line having a bond strength which is less than the strength of material of said remaining and tear portions whereby the application of a force to said tear portion causes a rupture along said weld line upon the relative displacement of said tear and remaining portions.
  • An easy-opening type article comprising a tear panel and a remaining panel portion, said tear panel being joined to the remaining panel portion by a welded web, the tear panel and remaining panel portion each having inner and outer parallel surfaces, said web being disposed generally normal to said surfaces, and said 10 article being entirely formed from molded generally homogeneous polymeric plastic material.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)
  • Closures For Containers (AREA)
  • Containers Opened By Tearing Frangible Portions (AREA)
US719503A 1968-04-08 1968-04-08 Easy-opening structure having a welded weakening line Expired - Lifetime US3499572A (en)

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US71950368A 1968-04-08 1968-04-08

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US (1) US3499572A (de)
JP (1) JPS5224477B1 (de)
DE (1) DE1916910C3 (de)
FR (1) FR2005810A1 (de)
GB (1) GB1257494A (de)
NL (1) NL6905391A (de)
SE (1) SE347460B (de)

Cited By (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3567061A (en) * 1969-07-08 1971-03-02 John S Song Easily openable sealed plastic closure method and apparatus
US3688934A (en) * 1969-04-01 1972-09-05 Fritz Linder Plastic container and method of manufacturing the same
US3927795A (en) * 1973-03-12 1975-12-23 Buckeye Molding Co Molded article
US3981412A (en) * 1971-03-29 1976-09-21 Asmus Richard W Container closure
US4126244A (en) * 1977-08-30 1978-11-21 Owens-Illinois, Inc. Container component with easy-opening wall section
US4129085A (en) * 1977-03-07 1978-12-12 Klein Gerald B Gated can end with shear offset defining gate and method for manufacture of the same
EP0090848A1 (de) * 1981-10-09 1983-10-12 Western Electric Company, Incorporated Spritzguss-vollkunststoff-auswerfanordnung
US4448324A (en) * 1982-05-10 1984-05-15 Ab Akerlund & Rausing Container closure having weaker opening means
US4702387A (en) * 1986-11-24 1987-10-27 Packaging Resources Inc. Container and plastic closure therefor
US4724977A (en) * 1987-05-05 1988-02-16 Acorn Technology Inc. Tamper-evident, reclosable, plastic lid
US4830214A (en) * 1985-11-12 1989-05-16 Mt. Vernon Plastics Corporation One-piece molded end closure
US4934556A (en) * 1988-01-16 1990-06-19 Miles Inc. Sealable test strip container
US4961511A (en) * 1988-02-16 1990-10-09 Ab Akerlund & Rausing End closure for a packaging container
US20060138706A1 (en) * 2003-10-01 2006-06-29 Brochu Ronald P Method for forming a groove in a thermoplastic article
US20130026677A1 (en) * 2011-07-28 2013-01-31 Carbonite Corporation Injection Moulding Plastic Components with a Slit
US11174075B2 (en) 2016-12-05 2021-11-16 Plasgad Plastic Products Acs Ltd Containers with tamper indicative hatch for sample removal
US11518076B2 (en) * 2018-06-12 2022-12-06 Tetra Laval Holdings & Finance S.A. Molding apparatus configured to injection mold an opening device on a sheet of packaging material
CN116368072A (zh) * 2020-10-29 2023-06-30 顶盖控股有限公司 罐盖和制造罐盖的方法

Families Citing this family (4)

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Publication number Priority date Publication date Assignee Title
US5054642A (en) * 1989-03-15 1991-10-08 Tenryu Chemical Industry Co., Ltd. Lid device for wide-mounted container and method of producing the same
SE8902080L (sv) * 1989-06-09 1990-12-10 Akerlund & Rausing Ab Behaallarefoerslutare
JPH03254919A (ja) * 1990-03-06 1991-11-13 Takata Kk エアバッグのモジュールカバーの製造方法
JPH0452117A (ja) * 1990-06-20 1992-02-20 Takata Kk エアバッグ装置のモジュールカバーの成形方法

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US3163317A (en) * 1962-09-24 1964-12-29 R C Can Co Break-away type closure for a container
US3281007A (en) * 1965-01-08 1966-10-25 United Shoe Machinery Corp Container closure devices
US3379364A (en) * 1966-07-07 1968-04-23 Reynolds Metals Co Package means

Patent Citations (3)

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US3163317A (en) * 1962-09-24 1964-12-29 R C Can Co Break-away type closure for a container
US3281007A (en) * 1965-01-08 1966-10-25 United Shoe Machinery Corp Container closure devices
US3379364A (en) * 1966-07-07 1968-04-23 Reynolds Metals Co Package means

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3688934A (en) * 1969-04-01 1972-09-05 Fritz Linder Plastic container and method of manufacturing the same
US3567061A (en) * 1969-07-08 1971-03-02 John S Song Easily openable sealed plastic closure method and apparatus
US3981412A (en) * 1971-03-29 1976-09-21 Asmus Richard W Container closure
US3927795A (en) * 1973-03-12 1975-12-23 Buckeye Molding Co Molded article
US4129085A (en) * 1977-03-07 1978-12-12 Klein Gerald B Gated can end with shear offset defining gate and method for manufacture of the same
US4126244A (en) * 1977-08-30 1978-11-21 Owens-Illinois, Inc. Container component with easy-opening wall section
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Also Published As

Publication number Publication date
DE1916910C3 (de) 1974-01-24
SE347460B (de) 1972-08-07
NL6905391A (de) 1969-10-10
JPS5224477B1 (de) 1977-07-01
DE1916910A1 (de) 1970-02-19
GB1257494A (de) 1971-12-22
FR2005810A1 (de) 1969-12-19
DE1916910B2 (de) 1973-06-20

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