US3601278A - Separable molded article - Google Patents

Separable molded article Download PDF

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Publication number
US3601278A
US3601278A US876623A US3601278DA US3601278A US 3601278 A US3601278 A US 3601278A US 876623 A US876623 A US 876623A US 3601278D A US3601278D A US 3601278DA US 3601278 A US3601278 A US 3601278A
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United States
Prior art keywords
panel
interface
tear portion
opening
tear
Prior art date
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Expired - Lifetime
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US876623A
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English (en)
Inventor
Edmund H Merz
Howard M Turner
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Continental Can Co Inc
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Continental Can Co Inc
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Publication date
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    • 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
    • B65D41/00—Caps, e.g. crown caps or crown seals, i.e. members having parts arranged for engagement with the external periphery of a neck or wall defining a pouring opening or discharge aperture; Protective cap-like covers for closure members, e.g. decorative covers of metal foil or paper
    • B65D41/32—Caps or cap-like covers with lines of weakness, tearing-strips, tags, or like opening or removal devices, e.g. to facilitate formation of pouring openings
    • B65D41/46—Snap-on caps or cap-like covers
    • B65D41/48—Snap-on caps or cap-like covers non-metallic, e.g. made of paper or plastics
    • 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
    • B65D17/00—Rigid or semi-rigid containers specially constructed to be opened by cutting or piercing, or by tearing of frangible members or portions
    • B65D17/50—Non-integral frangible members applied to, or inserted in, preformed openings, e.g. tearable strips or plastic plugs
    • B65D17/501—Flexible tape or foil-like material
    • B65D17/503—Flexible tape or foil-like material applied to the internal part of the container wall only
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/001—Action for opening container
    • B65D2517/0013—Action for opening container pull-out tear panel, e.g. by means of a tear-tab
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/0058—Other details of container end panel
    • B65D2517/0059—General cross-sectional shape of container end panel
    • B65D2517/0061—U-shaped
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/0001—Details
    • B65D2517/0058—Other details of container end panel
    • B65D2517/008—Materials of container end panel
    • B65D2517/0082—Coated or laminated metal
    • 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
    • B65D2517/00—Containers specially constructed to be opened by cutting, piercing or tearing of wall portions, e.g. preserving cans or tins
    • B65D2517/50—Non-integral frangible members applied to, or inserted in, a preformed opening
    • B65D2517/5002—Details of flexible tape or foil-like material
    • B65D2517/5024—Material
    • B65D2517/5027—Single layer

Definitions

  • Dim-nan ABSTRACT An article of manufacture including a panel and a tear portion joined at an interface which forms a seal and a weakening line along which the tear is separable from the panel.
  • the weakening line is formed by initially molding the panel or the strip portion to form one of the faces at the interface and using this preformed face as a mold surface to form the complementary sealing face of the other.
  • 97I GBOL 278 saw u or 5 T JB- l @293 I I 208 .209 2o4 INVENTORS ATT'Y.
  • the present invention relates to closures and, more particularly, to an easy opening closure for containers or the like.
  • FIG. 1 is. a top plan view of a closure embodying the principles of the present invention and applied to a container end, which is shown in phantom lines, to more clearly illustrate the structure of the closure;
  • FIG. 2 is an enlarged fragmentary sectional view showing the closure applied to the container and illustrating in phantom lines the tear portion in a partially open position;
  • FIG. 3 is an enlarged fragmentary cross-sectional view more clearly illustrating the configuration of the interface defining the weakening line along which the tear portion is separable from the panel;
  • FIGS. 4-6 are enlarged fragmentary sectional views similar to FIG. 3 but illustrating different configurations of interfaces
  • FIG. 7 is a cross-sectional view of the molding apparatus which may be used to manufacture the easy opening closure illustrated in FIGS. 1-3 and showing the apparatus in the closed molding position;
  • FIG. 8 is an end view of the indexing head of the apparatus shown in FIG. 7;
  • FIG. 9 is an end view of the stationary mold head of the ap paratus illustrated in FIG. 7;
  • FIG. l0 is a side elevational view of the indexing head partially in cross section and shown in the open position thereof;
  • F IG'. 1 l is a cross-sectional view of the indexing shaft taken generally along the lines ll11 of FIG. 7;
  • FIG. 12 is a longitudinal cross-sectional view through the indexing shaft taken generally along the lines 12l2 of FIG. 11;
  • FIG. 13 is a cross-sectional view of a further embodiment of a closure embodying the present invention.
  • FIG. 14 is a top perspective view of another novel easy opening closure constructed in accordance with the present invention, and illustrates a bottle cap having an end panel' joined to a peripheral skirt along a weakening line, and a pull tab portion for removing the entire end panel from the peripheral skirt;
  • FIG. 15 is a top perspective view of thebottle cap of FIG. 14, and illustrates the manner in which the pull tab portion is manually grasped and lifted to remove the end panel from the peripheral skirt;
  • FIG. 16 is an enlarged fragmentary sectional view taken generally along the line 16-16 of FIG. 14, and more clearly illustrates the manner in which the end panel is joined to the peripheral skirt along the weakening line;
  • FIG. 17 is a top perspective view of another bottle cap constructed in accordance with the present invention, and illus trates a tear strip which is defined by portions of an end panel and a peripheral skirt of the cap;
  • FIG. 18 is an enlarged sectional view taken generally along line 18-18 of FIG. 17, and more clearly illustrates a pair of parallel weakening lines joining the tear strip to remaining portions of the cap;
  • FIG. 19 is a top perspective view of the cap with portions removed for clarity, and illustrates the manner in which a pull tab of the tear strip is grasped for removing the tear strip from a remaining portion of the cap.
  • FIGS. l-3 the closure embodying the principles of the present inventionis shown in the form of an easy opening closure 10 attached to a container 11.
  • the easy opening closure 10 comprises a panel 12 and a tear portion 13 which is separable fIOIII the panel 12 along interface 14 of the panel 12 and tear portion 13 to form an opening 25.
  • the tear portion 13 may be formed with post 15 to which there is connected a pull tab 16.
  • the pull tab.l6 is grasped by the fingers for exerting a force to separate the tear portion 13 from the panel 12.
  • the interface l4 about the post 15 may be formed in the nature of a butt joint 14a which merges with the remainder of the interface 14 which as shown may be configurated as a scarf joint 14b.
  • the easy opening closure 19 is shown applied to a container 11 comprising generally a body 17 which may be made from any suitable material such as metal, plastic or the like. Attached to an open end of the body 17 is an end closure or cover 19 having a generally pear-shaped pour opening 21 formed therein.
  • Thecover 19 may be made from material the same as or different from the material of the container body 17. As shown, the cover 19 is made from metal and is suitably attached to the body 17 as by a double seam 22.
  • the easy opening closure 10 preferably secured to the underside of the end cover 19 so that the interface 14 is located inwardly of the edge of the pour opening 21 to reduce the danger of cutting along the metal or raw edge.
  • the tear portion 13, which may also be pear-shaped, is disposed over the pour opening 21 so that, upon separation from the panel 12, the contents of the container 11 which may be a beverage or the like may be easily removed.
  • the easy opening closure 10 may be made separate from the end closure 19 and subsequently adhered or attached thereto as by a suitable adhesive 23 or other bonding means.
  • the interface 14 is formed by preforming either the inner face or edge 24 defining the opening 25 in the panel 12 or the outer face or edge 27 of the tear portion 13 to provide a finished mold face on which the face of the other member is subsequently formed, as more fully to be explained hereinafter.
  • the panel 12 and tear portion 13 may be made from a suitable moldable material as, for example, a thermoplastic such as polyethylene, polypropylene or the like, a thermosetting plastic such as a filled phenolic molding powder, or rubber.
  • the panel 12 and tear portion 13 may each be made from plastic materials selected from the same chemical class having the same or different physical properties or may be selected from different classes.
  • the panel 12 and tear portion 13 may both be made from polypropylene selected from the same class, but the polypropylene used for the panel 12 may differ from the polypropylene used for the tear portion 13 in respect of physical properties such as the melt flow, density or the like.
  • either the panel 12 or tear portion 13 may be made from polypropylene while the other may be made from polyethylene. The particular material used will be determined to some extent by the container structure, container use, and in particular by the sealing characteristics desired at the interface 14.
  • the seal at the interface 14 is formed so that the abutting faces or edges 24 and 27 of the panel 12 and tear portion 13, respectively, form a seal which is capable of being separated therealong upon the application of a force thereon so that the interface 14 defines a weakening line.
  • the seal may be achieved by a tight fit of the tear portion 13 within the opening 25 so that the frictional forces at the interface 14 resist separation.
  • the seal of the remainder of the interface 14 is in the nature of a scarf joint 14b which is disposed so as to resist the tendency of the tear portion 13 to separate under the pressure forces ex- 'erted thereon by the container contents, such as carbonated 1 beverages or the like, .until a manually separating force is plied as more fully to be explained hereinafter.
  • FIG. 14 Further embodiments for forming a seal at the interface 14 may be a tongue and groove joint 14c as-illustrated-inFlG. 4, an interface dovetail joint 14d as shown in' FIG. 5 or a sawtooth joint 14e as shown in FIG. 6.
  • the joints 14b, 0 and d are constructed so as to form an interlock at the interface and thereby permit the reinsertion of the tear portion 13 into the opening.
  • the panel 12 and tear portion 13 are preferably each formed by injection molding, although it should be readily apparent that other molding methods, as for example, compression molding, transfer molding, or impulse molding may also be used. It should also be mentioned that the panel 12 and tear portion 13 may each be formed by-the same molding method or may be formed by different molding methods. Although the panel 12 having the opening 25 formed therein may be formed or molded first and used as a mold member to form the tear portion 13. In the preferred form of the invention the tear portion 13 is initially formed and the panel 12 molded thereabout as more fully to be explained hereinafter.
  • the injection molding apparatus 31 comprises generally a stationary head assembly 32 and an indexing head assembly 33.
  • the indexing head assembly 33 is mounted for lengthwise movement relative to the stationary head assembly 32 from the closed posi-
  • the stationary head assembly 32 includes a molding head 34 having fastened therein a mold plate 36 for forming the tear portion 13 and a mold plate 37 for forming the panel 12 about the tear portion 13.
  • the mold plates 36 and 37 as shown are each formed with a plurality of tear portion cavities 38 and panel cavities 39 for forming the tear portion 13 and the panel 12.
  • Each of the tear portion cavities 38 in the mold plate 36 is formed to shape the outer edge 27 of the tear portion 13 to form the scarf joint 14b and the butt joint 14a at the interface 14 of the completed closure 10. Projecting from and communicating with each of the cavities 38 is a cylindrical or post cavity 40 for forming the attachment post to which the pull tab 16 is subsequently attached.
  • Gates 41 are provided at the upper end of the post cavities 40 for introducing molten plastic into the cavities 38 and 39. Communicating with the gates 41 are runner grooves 42 which are connected to a horizontal passage 43 which receives p'nstic from a passage 44 injected therein through an inlet opening 46 by an injection head 45.
  • the panel forming cavities 39 are larger than the tear portion cavities 38 and include a post opening 46 for accommodating the posts 15 therein, as more fully to be explained hereinafter.
  • Gates 47 enter the cavities 38 at the wide end thereof and communicate with runner grooves 48.
  • the runners 48 communicate with a horizontal passage 49 and a radial passage 51 extending to the edge of the head assembly 32 and through which the molten plastic is injected by an injection head (not shown).
  • the index head assembly 33 includes generally a housing 52 in which there is turnably journaled an index head 53.
  • the index head 53 includes a rear annular plate 54 into which there is fixed one end of an index shaft 56.
  • the index shaft 56 is journaled for rotation in a bearing 55 seated in the housing 52.
  • the other end the shaft 56 is supported in a support assembly 57 for lengthwise sliding and turning movement during movement of the index head assembly 33 from the closed position shown in FIG. 7 to an open position shown in FIG. 8.
  • Mounted on the support assembly 57 is a spring-biased pin 58 which is received in two diametrically opposed slots 59 or 61 formed in the index shaft 56.
  • a guide shaft 66 Restraining the housing 52 against turning as the index head 53 turns is a guide shaft 66 which is fixed at one end to the housing 52 and at its other slidable within an opening 67 of the support assembly 57.
  • a spacing sleeve 68 Fixed to the rear annular plate 54 of the index head 53 is a spacing sleeve 68 to the forward face of which there is fixed a disc 69 to define a chamber 71 with the annular plate 54.
  • an index faceplate 72 Suitably attached to the disc 69 is an index faceplate 72 having a pair of tear portion transfer plates 73 and 74 inserted therein to cooperate with the mold plates 36 and 37 on the stationary head assembly 32 for transferring the tear portions 13 formed in the mold plate 36 to the panel forming mold plate 37.
  • the index faceplate 72' is provided with two sets of runner grooves 76, horizontal passages 77 and vertical passages 78, which cooperate with grooves 48, horizontal passage 49 and vertical passage 51 to form conduits through which the plastic flows when the stationary head assembly 32 and index faceplate 72 are in face-to-face relationship as shown in FIG. 7.
  • the transfer plates 73 and 74 are each formed with sets of retention feet opening 79 of generally dovetail configuration.
  • the sets of opening 79 are located to be disposed within respective ones of the tear portioncavities 38 of the tear portion mold plate 36. In this manner the plastic flowing into the tear portion cavities 38 also enters the retention feet openings 79 to form retention feet 81 on one side of the tear portion 13.
  • the stationary and index head assemblies 32 and 33 are separated, the tear portion 13 is retained on the transfer mold plates 73 and 74.
  • a pair of ejecting assemblies 82-82 one for each of the transfer plates 73 and 74.
  • the ejecting assemblies 82-82 each comprise a support plate 83 lengthwise slidable within the chamber 71 between the disc 69 and rear plate 54.
  • Fixed to the support plate 83 are ejecting pins 84 having ejecting fingers 85 extending into opening 86 formed in the respective transfer plate 73 and 74, and communicating with the retention feet openings 79.
  • the ejecting assembly 82 is actuated to the ejecting position during lengthwise movement of the indexing head assembly 33 to open position.
  • the index assembly stationary housing 52 is provided with an opening 87 and the indexing head rear plate 54 is formed with a pair of diametrically opposed openings 8888, of which one is aligned with the housing opening 87 when the index head 53 is turned during movement to the open position.
  • an actuating pin 89 carried by the shaft support assembly 57 extends through the aligned openings 87 and 88 and engages the slide plates 83 of one of the ejecting assemblies 82.
  • the other ejecting assembly 82 remains stationary.
  • the pin 89 is operative to slide the ejecting pins 84 and fingers 85 through the openings 86 and force the retention feet 81 on the tear portion 13 out of the retention opening 79.
  • the plurality of completed closures 10 are detached from the transfer plate 73 and 74 depending on which plate is aligned with the mold plate 36.
  • the four closure units 10 upon ejection remain attached to the sprue and runners which are later detached.
  • a sprue and runner separating assembly 91 is disposed between each of the ejecting assemblies 82-82 and includes a mounting block 92 which is engageably with shoulders 9393 on the ejecting pin support plates 83. Extending from the mounting block 92 is a pair of pins 94 which are slidable through the disc 69 and faceplate 72. As shown in FIG. 8, when one of the ejecting assemblies 82 is actuated to eject the retention feet 81 of a completed group of closures from the index head face plate 72, the mounting block 92 is simultaneously moved so that the pins 94 project outwardly to break the sprue and runners from the previously formed tear portions 13 seated in the upper transfer plate 74.
  • the indexing head assembly 33 is returned to the closed position shown in FIG. 7.
  • the indexing pin 58 rides in one of the linear slots 59 or 61 only so that the index head 53 remains stationary within the housing 52.
  • the sprue ejecting pins 94 engage the face thereof and are pushed inwardly.
  • the sprue ejectingpin mounting block 92 in engagement with the shoulder 93 on the slide plate 83 carrying the retention feet ejecting pins 84 is also moved rearwardly so that, when the stationary head assembly 32 and indexing head assembly 33 are in face-to-face engagement,
  • the temperature and injection pressure of the molten plastic entering the panel mold cavities 39 are controlled to maintain the hat at the interface 14 at a level below that causing the prior formed edge of the tear portion 13 to lose its configuration.
  • the heat is maintained at level sufficiently below that causing the formation of an unbreakable seal at the interface 14. lt has been found that the heat should be such that upon subsequent solidification of thepanel 12 about the tear portion 13 the latter is securely seated in sealing relationship thereon and capable of being separated along the interface 14 upon the, application of a manually applied force.
  • the manual force should preferably be less than about l5 pounds so that the force may be applied by the users fingers.
  • the actuating pin 89 enters the aligned opening '87 and 88 and engages the ejecting pin slide plate 83, so thatthe ejecting fingers 85 are operative to eject the completed closure units 10 from the transfer plate 73.
  • the forward movement of the slide 'plate'83 also moves the sprue removal pin 94,'into engagement with the sprue and runners attached to theytear panels 12I'so as to be separated therefrom.
  • Closures 10 have been made in accordance with the foregoing described method in which the tear portion 13 and panel 7 12 were both made from the same material.
  • the tear portion 13 was preformed to provide the interface structure 14 illustrated in FIGS. 2 and 3'..
  • the panel 12 was molded thereabout as described heretofore with injection of the plastic to form the panel 12 about the tear portion 13 being carried out under conditions in which the injection pressure was maintained at about 800 lbs. per square inch and withaconstant molding time (i.e., time during which the index head assembly 33 and stationary head assembly 32 remain closed) of about 4.0 seconds.
  • a plurality of runs were performed using different melt temperatures as determined at the nozzle of the injection head and different mold temperatures to vary the seal formed at the interface 14.
  • a pull tab 16 was attached to the posts 15 of each of the tear portion 13 to complete the closure 10. Thereafter the closures 10 from each of the runs were tested against specified standards to determine the popforce required to initiate separation of the seal at the butt joint 14a, the pull force required to separate the scarf joint 14b to the wide end; and detachment the pressure and temperature conditions will be described force requiredto complete the separation'of the tear portion 13 from the panel 12 at the wide end thereof.
  • the standard pop force is set not to exceed 8 poundsandthe'staridard pull and detachment forces are set not to exceed 15" pounds respectively.
  • the test was performed on an ln s'tron tensile stress unit which applied a constant strain rate of 2 inches per minute on the pull tab 16. i
  • Table I tabulates the results obtained when the panel 12 and tear portion 13 are both made from a polypropylene homopolymer having a melt flow of 4.0 and a density of 0.905 and'Table II when the panel 12 and tear portion 13 are both made from a polypropylene copolymer having a melt flow of 3.5 and a density of L898.
  • Butt joint 14a omilled uhd scarf joint 14h completely extending uhoul interface l4.
  • Closures were also formed in accordance with the foregoing method in'which the panel 12 was made from a plastic of a class different from the plastic of the tear portion 13.
  • the molten plastic for forming the closure 10 was injected at a conare tabulated below in Table III.
  • Nozzle Temp. Pop Value Pull Value Detach TABLE III 380 F. 80 F. 0.7 lbs. 2.0 lbs. 2.0 lbs.
  • closure 200 is shown associated with a pour opening 201 of a bottle 202, although it is to be understood that the closure may also be formed about a wide mouth opening container such as a jar or the like.
  • the pour opening 201 is formed with a retention bead 203 and may be provided with projections 204 defining a helical screw thread which merges with the bead 203.
  • the screw thread 204 facilitates the removal of the closure 200 therefrom.
  • the closure 200 is in the form of a cap or crown 206 having a top panel 207 and an integral depending flange 208.
  • the inner face 209 is joined to the outer face 210 of the bottle 202 adjacent the mouth at an interface 211 which defines a weakening line along which the cap 206 is separable.
  • the interface or weakening line 211 is formed by preforming either the inner face 209 of the cap flange or skirt 208 or the outer face 210 about the pour opening 201 so as to provide a finished mold face on which the face of the other member is subsequently molded.
  • the cap 206 and bottle 202 may be made from suitable moldable material as for example, a thermoplastic such as polyethylene, polypropylene and the like, a thermosetting plastic such as a filled phenolic molding powder or rubber.
  • the compositions of the plastics used to made the cap and bottle may be similar to those heretofore described in connection with the embodiments of FIGS. 1-6.
  • the cap 206 and bottle 202 are formed by molding in sequence so that the face is preformed and may be used to form the complementary face of the other. Assuming that the cap 206 is formed first so that the inner surface thereof is preformed, the cap is then positioned into a mold in which the bottle is formed. The cap 206 is located in the bottle forming mold (not shown) so as to provide a mold surface for forming the exterior face 210 about the pour opening of the bottle.
  • the heat of the molding of the bottle is maintained, as described heretofore, so that upon subsequent solidification of the pour opening portion of the bottle 202 to the cap, the latter is sealed thereto and at the same time capable of being separated along the interface upon the application of manual twisting force.
  • the heat to achieve the separable interface is obtained by controlling the temperature and injection pressure so that the inner face 209 of the cap 206 forming the mold for the pour opening portion of the bottle 202 does not loose its configuration. When the heat is controlled in this manner. the interface is separable and upon manual twisting each of the faces at the interface maintain their integrity.
  • FIGS. 14 through 19 of the drawings illustrate a cap generally designated by the reference numeral 300 which is secured to a neck N of the conventional bottle B.
  • the cap 300 is of a two-piece construction defined by a removal tear-out panel portion 302 and a remaining peripheral skirt portion 303.
  • the tear-out panel 302 and the remaining portion 303 are joined to each other along a weakening line 304 (FIG. 16) which functions to facilitate the rupture and subsequent removal of the tear-out panel 302 in a manner which will be more apparent hereafter.
  • the tear-out panel portion 302 is generally circular and may be slightly larger than the exterior diameter of the peripheral skirt 303, as is best illustrated in FIG. 16.
  • a pull tab 305 depends downwardly from the tear out panel portion 302 extends along the peripheral skirt 303 and terminates in a ringlike gripping portion 306 having a finger-receiving opening 307.
  • the cap 300 is formed by either of two analogous methods which correspond to those heretofore described in connection with the embodiment of FIGS. l-6, wherein the peripheral skirt 303 or the tear-out panel 302 and its integral pull tab 305 is formed first and thereafter the other is molded thereabout.
  • the tear-out portion 302 and its tear-tab 305 are initially formed from plastic material by a conventional molding process and that the pull tab is in the plane of the tear-out portion
  • the tear-out portion may be positioned in a split-mold which when closed has an annular cavity disposed with its axis concentric with the central axis of the tear-out portion 302.
  • Molten synthetic polymeric material such as polyethylene, polypropylene, etc., is then injected into the closed mold into the annular cavity, and the mold is maintained under controlled temperature and pressure as heretofore described which causes the material in the cavity to mold about the prior molded surface of the tear-out panel portion 302 at the circular interface or weakening line 304.
  • the plastic material solidifies along a line or plane of weakness which is separable upon the application of a pulling force.
  • the cap 300 is secured to the bottle neck N as for example, by crimping, the lower end of the peripheral skirt 303 as shown and folding the tear-tab 305 downwardly, the latter is merely lifted and pulled as diagrammatically illustratcd in FIG. 15 causing the tear-out panel 302 to rupture along the weakening line 304 effecting the eventual complete removal of the panel 302 from the peripheral skirt 303.
  • the contents packaged in the bottle B can now be dispensed, it being noted that the peripheral skirt 303 remains on the neck N of the bottle B in accordance with this embodiment of the invention.
  • cap 300 Another method of forming the cap 300 is the reverse of that heretofore described, namely, first forming the peripheral skirt 303 and positioning the same in a mold having a cavity corresponding to the tear-out panel 302 and its associated pull tab 305. Upon the introduction of synthetic polymeric material into this cavity the cap 300 is similarly formed with the weakening line 304 at the interface of the tearout panel 302 and the peripheral skirt 303.
  • FIGS. 17 through 19 of the drawings A closure in the form of a bottle cap for permitting the entire removal thereof from an associated bottle is shown in FIGS. 17 through 19 of the drawings, and is generally designated by the reference numeral 310.
  • the cap 310 is similarly of a two-piece construction defined by a removable tear-out panel portion 312 in the form ofa pull strip and a remaining portion 313.
  • the tear-out panel 312 and the remaining portion 313 are joined to each other along a pair of parallel weakening lines, which are generally designated by the reference numeral 314, 315 and a bridging weakening line 316.
  • the weakening lines 314, 315 extend from the weakening line 316 across an end panel 317 of the cap 310 and down a diametrically opposite side of a peripheral skirt 318, as is best illustrated in FIG. 18.
  • a pull tab portion 320 of the tear-out panel 312 projects beyond the peripheral skirt 318 and terminates in a gripping ring 321 having a fingerreceiving opening 322.
  • the cap 310 is formed analogous to that heretofore described relative to the method of forming the cap 300, except for the particular configuration of the mold in which the cap 310 is formed. Therefore, it is believed unnecessary for a complete understanding of this invention to describe the particular method of forming the cap 310. However, it will be pointed out that by either of the two methods, the weakening lines 314, 315 and 316 are separable upon the application of an upwardly directed force to the tear-out panel 312 by gripping and pulling the same as shown in FIG. 19 results in the complete removal of the panel 312. The remaining portion 313 of the cap 310 can now be readily grasped and easily removed as the material of the peripheral skirt 318 can be manually spread to remove the remaining portion 313 completely from the associated bottle.
  • An article of manufacture comprising a first member and a second member connected to said first member at an interface defining a weakening line along which said second member is separable from said first member upon the application of a manual force thereto, said weakening line being formed by the sequential molding of said first and second members using a prior molded face at the interface of one of said members to form the complementary face of the other of said members.
  • first member comprises a generally tubular body having an open end
  • second member comprises a closure superposed over the open end of said tubular body
  • closure includes a downwardly depending skirt embracing said tubular body to form said interface defining said weakening line.
  • tubular body and said closure are both made from a plastic material.
  • a closure member attachable to said container for covering said opening, said closure member comprising a panel member having an opening, a tear portion molded in said panel opening with the edge of the tear portion and the edge defining said panel opening lying on an interface forming a seal and defining a weakening line along which the tear portion is separated from said panel, and finger grip means on said tear portion for applying a force for separating said tear portion from said panel.
  • edges at said interface are formed to interlock and provide for reinsertion of said tear portion into said opening.
  • An closure for an open ended container comprising a panel adapted to overlie the end of said containcr, and a depending skirt adapted to embrace the exterior of said container about said opening, said closure including a tear portion formed in said panel and separable therefrom to provide an opening, saidtear portion being joined to said panel along an interface defining a weakening line, said weakening line being formed by a sequential molding of said panel and said tear portion using a prior molded face at the interface of one of said tear portion or said panel to form the complementary face of the other.
  • said tear portion comprises a pair of spaced weakening extending from said panel and terminating at the free end of said skirt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Closures For Containers (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
US876623A 1969-11-14 1969-11-14 Separable molded article Expired - Lifetime US3601278A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US87662369A 1969-11-14 1969-11-14

Publications (1)

Publication Number Publication Date
US3601278A true US3601278A (en) 1971-08-24

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ID=25368184

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Application Number Title Priority Date Filing Date
US876623A Expired - Lifetime US3601278A (en) 1969-11-14 1969-11-14 Separable molded article

Country Status (8)

Country Link
US (1) US3601278A (enrdf_load_stackoverflow)
BE (1) BE758253R (enrdf_load_stackoverflow)
DE (1) DE2055986A1 (enrdf_load_stackoverflow)
DK (1) DK131976C (enrdf_load_stackoverflow)
GB (1) GB1273660A (enrdf_load_stackoverflow)
IT (1) IT947045B (enrdf_load_stackoverflow)
SE (1) SE7012984L (enrdf_load_stackoverflow)
ZA (1) ZA707607B (enrdf_load_stackoverflow)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2856332A1 (fr) * 2003-06-20 2004-12-24 Piscines Desjoyaux Sa Panneau pour la realisation d'un bassin de piscine
US9862166B2 (en) 2016-03-07 2018-01-09 The Boeing Company Adjustable-height inserts and related methods
US9976583B2 (en) 2016-04-04 2018-05-22 The Boeing Company Threaded adjustable-height inserts and related methods
US10099767B2 (en) 2015-08-04 2018-10-16 The Boeing Company Sandwich panel inserts and related methods
US11850810B2 (en) 2021-05-18 2023-12-26 The Boeing Company Skin-bonded threaded inserts, sandwich panels including the same, and related methods

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2628797B1 (fr) * 1988-03-17 1990-08-24 Rockwell Cim Support pour fixer des objets a des composants de l'habitacle d'automobiles, notamment pour fixer une glace a un pare-soleil en matiere plastique mousse
US10850591B2 (en) * 2016-02-16 2020-12-01 Pacific Link, L.L.C. Apparatus and system for air conditioning output measurement and coolant servicing
USD1047080S1 (en) 2020-04-29 2024-10-15 Ac Avalanche, Llc Dispenser housing
CN116670423A (zh) 2020-11-19 2023-08-29 太平洋联合有限公司 自动加注过加注保护温度感测空调冷却剂再充注

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3276616A (en) * 1964-02-05 1966-10-04 Continental Can Co Plastic container and closure and method of forming the same
US3401821A (en) * 1966-05-03 1968-09-17 Continental Can Co Container having tear-out opening means

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3276616A (en) * 1964-02-05 1966-10-04 Continental Can Co Plastic container and closure and method of forming the same
US3401821A (en) * 1966-05-03 1968-09-17 Continental Can Co Container having tear-out opening means

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2856332A1 (fr) * 2003-06-20 2004-12-24 Piscines Desjoyaux Sa Panneau pour la realisation d'un bassin de piscine
WO2005003492A1 (fr) * 2003-06-20 2005-01-13 Piscines Desjoyaux Sa Panneau pour la realisation d’un bassin de piscine
US20070000190A1 (en) * 2003-06-20 2007-01-04 Jean-Louis Desjoyaux Panel for the production of a swimming pool
CN100458086C (zh) * 2003-06-20 2009-02-04 德茹瓦约游泳池有限公司 用来建造游泳池的板
US10099767B2 (en) 2015-08-04 2018-10-16 The Boeing Company Sandwich panel inserts and related methods
US10730604B2 (en) 2015-08-04 2020-08-04 The Boeing Company Sandwich panel inserts and related methods
US9862166B2 (en) 2016-03-07 2018-01-09 The Boeing Company Adjustable-height inserts and related methods
US9976583B2 (en) 2016-04-04 2018-05-22 The Boeing Company Threaded adjustable-height inserts and related methods
US10228003B2 (en) 2016-04-04 2019-03-12 The Boeing Company Threaded adjustable-height inserts and related methods
US11850810B2 (en) 2021-05-18 2023-12-26 The Boeing Company Skin-bonded threaded inserts, sandwich panels including the same, and related methods

Also Published As

Publication number Publication date
IT947045B (it) 1973-05-21
ZA707607B (en) 1972-07-26
DK131976B (da) 1975-10-06
SE7012984L (sv) 1971-05-17
BE758253R (enrdf_load_stackoverflow) 1971-04-01
DE2055986A1 (de) 1971-06-03
GB1273660A (en) 1972-05-10
DK131976C (da) 1976-03-01

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