CN1037677A - The plastic closures of the molded foaming sealant of band one - Google Patents

Abstract

A kind of molded polymer container seals the foaming layer of the same polymer that contains a polymeric layer that at least one is non-foaming basically and an one model forming.

Description

The plastic closures of the molded foaming sealant of band one

The present invention relates to plastic closures, relate to sealing of glass or plastic containers specifically.One aspect of the present invention relates to sealing of a pop bottle a kind of head, injection molded.A second aspect of the present invention relates to a kind of container closure that contains the molded foamable polymer sealant of one deck one.A further aspect of the present invention relates to a kind of plastic container sealing with foaming sealant that one deck forms on the spot.

Plastic container sealing, the plastic closures of concrete the is pop bottle of threaded neck is known, is once for example disclosing in the United States Patent (USP) 4,310,101,4,326,693,4,394,918,4,461,391 and 4,476,987 in the past.These seal typically adopt seal disc with/or molded flange contact to alleviate gas leakage with bottleneck.When using separately, the plastic flange that integral body is moulded out fails to provide required sealing property.Though it is quite effective to alleviating gas leakage that seal disc is proved to be, but separately make and the molded bottle cap of packing in, thereby increased required time of sealing of a satisfaction and the expense of producing.Therefore require to have a kind of plastic bottle closure satisfactory seal performance, that one is molded that has.

When needing the plastic closures of heat insulation containers, also runs into the production contained object problem.This container often adopts the plastic closures that carries out sealed engagement by frictional fit with bottleneck, edge or the wall of container.This frictional fit typically realizes by the compression seal pad of molded screw thread, band taper surface or separately manufacturing.In order to reduce the heat conduction by this plastic closures body, under many circumstances, manufacturer is molded contains sealing of the cave, chamber that can inject another kind of foamed heat-insulating material in it subsequently.Therefore need one plastic closures molded and that contain a heat insulation fuse of foamable polymer that is wrapping by the outward surface layer of non-foaming.

At United States Patent (USP) 3,721, in 197, enter a die cavity, make mixture in die cavity, partly solidify, reduce mixture foam-in-site that cavity pressure allows some inject out and form a kind of ammunition feed shell and use a sort of plastics filling structure (wadstructure) by enlarging die cavity then the cooling of this mixture of injecting out by the molten mixture of injecting a kind of resin material and a kind of blowing agent.

The invention provides a kind of improved polymer container and seal, it contains the molded foamable polymer sealant of one deck one.One embodiment of the present of invention provide a kind of and are applicable to that the threaded neck with glass or plastic bottle becomes the plastic bottle closure of sealed engagement.According to another embodiment of the invention, threaded and contain one and twist off ring (pilfer ring) be used for identifying whether bottle cap has the people to open before the consumer drinks as the bottle cap of theme.

Most preferred embodiment of the present invention provides a kind of molded thermoplastic bottle cap, and it is molded integratedly between the high-density layer of two-layer same polymer that it contains foaming disk or an annulus.The foamable polymer layer is used to provide the sealed engagement between the edge face up of the inner surface down of bottle cap and bottleneck.

An alternative embodiment of the invention provides a kind of one molded plastic container sealing, and it contains the internal layer of a foamable polymer that is encased by the outer wall of the same polymer of non-foaming.Such molded heat-proof quality that provides fabulous of sealing, and can simplyr produce than heat insulation the sealing of routine more economically.

A most preferred embodiment of plastic closures of the present invention will further be described and illustrate in conjunction with the following drawings, wherein

Fig. 1 is that bottle cap of the present invention installs to the front view that on the bottleneck, partly dissects out;

Fig. 2 is the face upwarding section that the 2-2 line along Fig. 1 dissects;

Fig. 3 is a detail drawing, and a part of magnification ratio ground depiction 1 midship section is to illustrate foamable polymer layer of the present invention better and stretch contact wire between the bottleneck on bottle cap and bottle cap dress bottle thereon.

The same numeral of same part in all figure.

Referring to Fig. 1, bottle cap 10 is depicted as with bottleneck 12 and is threadedly engaged with.For ease of explanation, all the other partly disconnect bottle.As a same reason, in Fig. 1 left side, bottle cap 10 is cut open to describe a partly cut-away view with the some of bottleneck 12.Bottle cap of the present invention successfully uses on vial or plastic bottle.

Bottle cap 10 preferably comprises circular end wall 14 and sidewall 16 along circumferential extension.According to the present invention, end wall 14 preferably also comprise the Huanshui River 2 4a that foamable polymer layer 14b be clipped in layer 14a, the 14c of the bigger same polymer of two-layer density be the main structure layer of end wall 14 and preferably with sidewall 16 molded together with provide the pressure that can resist to be subjected to when the sealing carbonated drink container, fastening, one seals continuously.

The interior of sidewall 16 preferably also contains molded screw thread 18 with screw thread 20 engagement of bottleneck 12 to the surface.Helping the consumer to firmly grasp bottle cap 10, but this pedestrian will appreciate that when reading this paper annular knurl or other superficial makings similarly can be molded for this purpose on the export-oriented surface of sidewall 16 on many export-oriented surfaces that selectively are arranged on sidewall 16 at the rib 22 that is spaced apart on the circumference.

According to a most preferred embodiment of the present invention, bottle cap 10 also contains and twists off ring 24 with shoulder 26 engagement of bottleneck 12.It is preferably molded with sidewall 16 with the end wall 14 of bottle cap 10 to twist off ring 24, and by a plurality of narrow, along the circumferential direction separate setting, when sidewall by turn with the stubborn bottom that can be connected to sidewall 16 during from bottleneck 12 of bottle cap 10 owing to the thermoplastic jumper 28 that pulling force disconnects.Certainly should be appreciated that the configuration that twists off ring is not critical to the present invention, multiple twist off ring structure in use with/or in prior art, described.

Return end wall 14, foamable polymer layer 14b is preferably disposed on thickness with between sidewall 16 much the same nonfoamed layer 14a and layer 14c that is made of the relatively thin non-foamable polymer of one deck.According to one embodiment of present invention, the thickness of non-foamable polymer layer 14a is about the twice of non-foamable polymer layer 14c, and the thickness of foamable polymer layer 14b is about the twice of non-foamable polymer layer 14a.The total thickness of end wall 14 preferably reaches about 0.185 inch (0.47cm), and the pop bottle with the polypropylene manufacturing is sealed, and it is optimum that its thickness is about 0.125 inch (0.32cm).But be to be understood that end wall 14 with and the thickness of forming layer 14a, a 14b, 14c can change by sealing the pressure that must bear in the size of used fluoropolymer resin, container and geometry and the use.The structure of layer 14a, 14b, 14c and they will further describe in conjunction with the manufacture method of each layer and illustrate in the mode as combination in the sealing of theme.

Bottle cap 10 preferably contains the main part of the thermoplastic resin of a mouldable moulding.Though the preferred resin to a special-purpose can change, the good resin that is used for making bottle cap of the present invention can be from for example olefines, phenylethylene, polyesters, Merlon or other suitable engineerings with selecting the resin.These can be used as with other resin that homopolymers adopts maybe can be by the needs of within the scope of the present invention concrete application with other composition copolymerization or mix.The various additives that the thermoplastic formulation that molding is used that this pedestrian is familiar with is suitable for self-evidently can be used in the prescription that adopts the container closure of making this theme.

The optimum resin of the bottle cap that uses for laughable carbonated drink is the copolymer of a kind of polypropylene and EDPM rubber.The good copolymer product that a kind of a species of small clam living in fresh water shell oil company is arranged on the market, commodity are called WRS 7237.Thereby add in a small amount the rubber low temperature impact properties of bottle cap finished product that improved improving of resin.

In order to make best bottle cap of the present invention, this thermoplastic resin preferably mixes with the additive of being familiar with that other are used in the foamed thermoplastics prescription with nucleating agent, the antioxidant of some effective deals in a small amount, feeds then in the extruding zone of a conventional injection machine.Blowing agent preferably under high pressure sprays into the resin through plasticating in the extruding zone, and after this this mixture remains in enough pressure bottom discharge to die cavitys to prevent that resin from foaming round the nucleating agent position.The blowing agent that seals that is used for making this theme can be selected from for example nitrogen, carbon dioxide and other commercial fluorocarbons.

Mould preferably designs like this, when shaping mould at first altogether the time, the space in the die cavity roughly corresponding to layer 14a and 14c, the sidewall 16 of the end wall 14 of bottle cap 10, twist off the shape of ring 24 and jumper 28.Partly just can achieve this end expediently with containing the formpiston that forms bottle cap 10 inner surfaces with the mould that forms bottle cap 10 outer formers parts of facing the wall and meditating.The formpiston of mould partly preferably can also enlarge by the inserts that can extract out will form the die cavity of end wall 14 in moulding process volume a little.Inserts is extracted out when the resin through plasticating begins to cool down in die cavity, thus will corresponding to the end wall 14 of bottle cap 10 that partly the pressure in die cavity be reduced to and be enough to allow blowing agent expand.When inserts was extracted out, it was moving thereupon to paste the colder resin boundary surface layer of extracting the surface out, formed the layer 14c of end wall 14.In the boundary layer back, blowing agent impels thermoplastic resin to expand, and enters the zone that pressure has reduced, thereby forms the abscess of single foamable polymer round the nucleating agent position, and these abscesses form the layer 14b of end wall 14 in cooling back fully.The relative thickness of layer 14a, 14b, 14c therefore will by the composition of polymer, before inserts is extracted out with the back model in pressure, before inserts is extracted out and the distance of degree of cooling off in the extraction and inserts extraction and changing.

If the surface of the inserts that can extract out is interior to surperficial co-extension with the layer 14c's of bottle cap 10, being expanded by resin enters the zone that pressure reduced and a layer 14b who forms will produce a continuous foamable polymer layer of crossing over bottle cap 10 inner peripherys.On the other hand, if the surface of the inserts that can extract out is an annulus, layer 14 foamable polymer that will contain annular " Deep-fried doughnut " formula along circumferential extension are separated layer 14a and 14c, except the central part of the end wall 14 of bottle cap 10.

Referring to Fig. 1 and 3, can see, when bottle cap 10 tightly installs on the bottleneck 12, on the surface of apical margin 30 reinforcings to layer 14c in connection with apical margin of bottleneck 12.This power causes that partly foamable polymer abscess compression of back of trying to gain 4c contacting with apical margin 30, and upwards being offset of layer 14c in connection with apical margin 30 from Fig. 1 and 3 just obtains confirming.This effect provides the tight sealing between a required bottle cap 10 and the bottleneck 12.

If needed, can the groove that correspondingly is shaped be set in the layer 14c on the face on surface, on the layer 14c of end wall 14, shown in Fig. 1 and 2, form the rib 32 that selectively is provided with like that by in the mould correspondence.Shown in Figure 2 will help further to strengthen end wall 14 near these the radially overhanging ribs layer 14c center.

Comprise screw thread 18 for fear of polymer at sidewall 16(), twist off the ring 16 or jumper 28 in any tangible foaming is arranged, be injected in the die cavity at the beginning from polymer, until be cooled to be enough to keep bottle cap 10 each partly after the demoulding till the dimensionally stable during this period of time in, pay special attention to all surface of negative and positive half one of injection mould, except the inserts that can extract out, all to remain locked on the fixing mutual alignment.

Container closure disclosed herein follows the polymer of other Unitarily molded moulding to seal ratio, shows that very desirable intensity is to the ratio of weight and low volume density.Device and process with the prescription of used polymer, the geometry of sealing, moulding are decided, and can produce gaseous state or fluid liquid are enclosed in sealing in the container satisfactorily.

This pedestrian will be apparent from other advantages of the bottle cap of this theme and various variation and improvement having read behind this paper, and all these change with improving all includes in the scope of claims.

Claims (18)

1, a kind of molded polymer container seals, and it is characterized in that containing the foaming layer of at least one non-foamable polymer layer with at least one same polymer.

2, by the container closure of claim 1, it is characterized in that described foamable polymer layer is configured between second nonfoamed layer of described non-foamable polymer layer and same polymer.

3, by the container closure of claim 1, it is characterized in that the main part of described polymer is selected from olefines, phenylethylene, polyester and Merlon.

4, by the container closure of claim 3, it is characterized in that described polymer is the some of a polymer formulators, also comprises a kind of blowing agent and a kind of nucleating agent.

5,, it is characterized in that described polymer contains main partly a polypropylene and a less important part EDPM rubber by the container closure of claim 3.

6,, it is characterized in that described sealing also contain at least one molded screw thread and be contained on the described container in order to this is sealed by the container closure of claim 1.

7, by the container closure of claim 1, it is characterized in that described seal contain one on all limits by one molded, same polymer be the foamable polymer layer that nonfoamed layer encases basically.

8, the bottle cap of the thermoplastic resin molded moulding of a kind of usefulness, it is characterized in that the described lid of moulding contains a sealant that is used to provide sealed engagement when this bottle cap being installed on the bottle, the sealing layer is with molded integratedly with all the other thermoplastic resins partly same, that just density is lower of this bottle cap.

9,, it is characterized in that described thermoplastic resin contains at least a polymer that is selected among olefines, phenylethylene, polyester and the Merlon by the bottle cap of claim 8.

10,, it is characterized in that described thermoplastic resin also contains rubber in a small amount by the bottle cap of claim 9.

11, by the bottle cap of claim 10, it is characterized in that described thermoplastic resin contains the copolymer of polypropylene and EDPM rubber.

12, by the bottle cap of claim 8, it is characterized in that also containing one and twist off ring.

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14, by the container closure of claim 13, it is characterized in that described foamable polymer layer contains a kind of thermoplastic resin that is selected from olefines, phenylethylene, polyester and the Merlon.

15,, it is characterized in that described foamable polymer layer also contains rubber in a small amount by the container closure of claim 13.

16,, it is characterized in that described thermoplastic resin contains a main partly polypropylene by the container closure of claim 13.

17, a kind of being applicable to follows the thermoplastic of a bottleneck sealed engagement to seal, it is characterized in that described seal contain one normally circular, its diameter is greater than the end wall of described bottleneck external diameter, described end wall contains one and is used for following the interior to the surface of this bottleneck end contact, a molded integratedly sidewall on this end wall is arranged, described sidewall also circumferentially stretches around this bottleneck, have molded integratedly on this sidewall and be used for screw thread with the screw-threaded engagement of this bottleneck outside, have one molded integratedly, in this end wall, form on the spot, flexible foamed thermoplastic resin's layer, described elastic layer are used for providing a close sealing of fluid between this end wall and this bottleneck end when this seals with this bottleneck thread engagement.

18, by the sealing of claim 17, it is characterized in that described elastic layer be ring-type and at least with described bottleneck co-extension.

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