CN1189121A

CN1189121A - Container with integral handle, preform and method of manufacture

Info

Publication number: CN1189121A
Application number: CN96194894A
Authority: CN
Inventors: 格林·罗伯特·贝尔勒
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-04-20
Filing date: 1996-04-19
Publication date: 1998-07-29

Abstract

A pre-form for a container comprised of orientable thermoplastic material and arranged so that the resultant blown container will include a handle or like support structure; the pre-form comprising a moulded structure having a neck portion and an expandable portion below the neck, the neck including a locating ring above the expandable portion and a solid stem of orientable thermoplastics material projecting from the locating ring and moulded integrally therewith which when the container is formed constitutes the handle. In a preferred embodiment, there are two non-expanding regions immediately below the locating ring, the first of which is raised or otherwise differentiated. A ribbed handle is attached to the locating ring and the non-expanding region.

Description

The container, performing member and the manufacture method that have integral catch

Foreword

The present invention relates to a kind of performing member, the container such as pet container can be formed by this preformed member system of inhaling, and more particularly, relates to a kind of performing member and by its a kind of container that has integral catch that makes.

Background of invention

People attempted with integral handle and PET or similarly the injection-blow molding container be integrated, for example referring to normal 4,629, No. 598 of the United States Patent (USP) of Thompson, this patent has transferred TritechSystems International company.Be used for producing United States Patent (USP) the 4th, 629, the parison of the band handle bottle in No. 598 as shown in Figure 1.Yet it all is unsuccessful up to now, making effort a kind of like this practicality, the mass-produced device of energy.Otherwise the best method that occurs in the business practice is after container itself is shaped, and more blown container is loaded onto clamping connection or plug-in type handle in an independent production stage.This can apply for WO82/02371 and WO82/02370 referring to two of Thompson.

Injection-stretching-blowing is one parison is stretched vertically and radially that the result causes the method for biaxial orientation.

Because biax orientation makes molecules align tightr, so the tensile strength (maximum load) that can obtain increasing, hypotonicity, and the impact resistance that can improve container, transparency and slight.

Not all thermoplastic all can carry out orientation stretching.The main thermoplastic that uses is polyethylene terephthalate (PET), polyacrylonitrile (PAN), polyvinyl chloride (PVC) and polypropylene (PP).PET is a kind of material of volume maximum, next is PVC, PP, PAN.

Have thermoplastic amorphous material on a large scale,, compare easier stretch blow with the partially-crystallized material such as PP as PET.The fusion and the draft temperature that can produce the container optimal performance approximately are:

Material melt temperature ℃ draft temperature ℃

PET 280 107

PVC 180 120

PAN 210 120

PP 240 160

The method that two kinds of stretching-plastic uptakes are arranged basically: 1) in one-level, make preformed member, and on uniform machinery, carry out the blowing of bottle; 2) in two-stage, finish, on a machine, make preformed member earlier, on another machine, blow again.

One-level equipment can be used to produce PVC, PET and PP.Made behind the preformed member (no matter be mold pressing or injection moulding), it is warming up to draft temperature when regulating workbench.One level system can make the process from raw material to the finished product carry out on a machine, but because process unit malleable not, so this method is best suited for occasion special and low capacity.

Orientation stretching PVC container is made by one-level extrusion pressing type machine the most commonly.Parison is extruded on single head or double end element.According to the different designs of machine, available diverse ways carries out adjustment, stretches and thread forming.Many methods of using are patented methods now.

The pet container of many orientation stretchings is made by the one-level machine.Earlier preformed member is carried out injection moulding, put into the adjustment workbench then, then carry out blow molding operation, the bottle that preformed member stretched-be blow molded into is sent into the release workbench at last.

By using two-stage approach, can technological parameter that produce preformed member and blown bottle be optimized.Can resembling on one-level equipment, the processor to take into account the design and the weight of preformed member, speed of production, and the quality of bottle.He can make by oneself also can buy preformed member.And if selected the self-control preformed member, he could produce in the one or more places that adapt to its market.High yield machine and low yield machine all can obtain for two kinds.Usually use two-stage extrusion pressing type machine to come the PP bottle of production biaxial tension.In a typical method, preformed member is pushed again, cooling, fixed length cutting, heating again stretches when neck is repaired and releases then.The pet container cost of using two-stage approach production orientation stretching is minimum.Preformed member is carried out delivering to after the injection moulding two-stage approach of blowing workshop section again, make manufacturer can become the producer of preformed member, and product can be sold the blowing producer.Wish that like this manufacturer that comes into the market with the orientation stretching pet container just can reduce capital expenditure.Two-stage stretching-blow moiding method also is used for the production of orientation stretching PVC container.The relation of the design of preformed member and it and finished container still is the factor of a most critical.If container is the predetermined product of splendid attire better, then should select suitable axial and hoop draw ratio.Material extending is than orientation stretching temperature PET 1,6/1 195～240 PVC 7/1 210～240 PAN 9/1 220～260

PP 6/1 260～280

The objective of the invention is to produce a kind of practicality,, be with the container of handle easily by injection-stretching-blow molding with the thermoplastic of orientable stretching, handle be in described injection-stretching-blow molding operation, form and as the part of container.

Summary of the invention

According to an aspect of the present invention, provide a kind of preformed member that is used for making the container that comprises orientable drawn thermoplastic material, this container that final blowing is formed comprises a handle or similar supporting construction; This preformed member comprises a blow-molded plastic, this structure has neck and is positioned at the following expandable part of neck, this neck comprises the locating ring and the hard handle of being made by orientable drawn thermoplastic material that are positioned at the expandable part top, this stretching out from locating ring and being integral with vessel pressure, has just formed handle firmly when making container.

Preferably, this is firmly from described locating ring, and stretches out from the temperature transition district of adjacent locating ring below.

According to a further aspect in the invention, provide a kind of method of making band integral catch container, this method comprises:

(a) make a preformed member that has neck and expandable part is arranged below neck, this neck comprises a locating ring that is positioned at the expandable part top, and one stretched out and suppress all-in-one-piece with it from locating ring, made by orientable drawn thermoplastic material hard.

(b) described preformed member is carried out blow molding operation, expandable part is expanded, thereby constitute the bottle of container.

Preferably, this is firmly stretching out from the temperature transition district of described locating ring and adjacent locating ring below.

In a preferred form of the present invention, neck and integral catch all will pass through crystallization process.

Preferably, blow molding operation comprises the process of support handle, and preformed member is blown with following manner, promptly at least the part in the body outside expand into can be around the bottom of handle at least, thereby the outside and firmly between a sealing of formation hold part.

Preferably, holding of sealing partly can make at least two fingers of adult's palm pass through.

In a concrete preferred form of the present invention, handle has the cross section of I type at least in the part of stretching out from the outside of described body.The profile of handle can carry out bending, so that bigger intensity to be provided.

In a wider form of the present invention, a kind of parison that is used for injection stretch blow molding process is arranged, this parison is to be made by the injecting method that comprises two independent injection points.

Preferably, first of injection can be injected expendable PET or similar thermoplastic.Preferably, second of injection can be injected PET or the similar thermoplastic that comprises at least a portion recyclable material.

Preferably, first of described injection is used to form the part that will be stretched in the stretch-blow operation of parison.Preferably, second of described injection is used to form and keeps not expanding or non-bloating substantially that part of in the operation of the stretch-blow of parison.

In another wider form of the present invention, a kind of container that adopts two-stage injec stretch-blow technology to make is provided, but this container comprises a handle that was fixed at least on the container on first and second o'clock, thereby form an enclosed area between handle and bottle, people's finger can therefrom pass.

Preferably, described first tie point comprises a monoblock type coupling part between handle and container, and this coupling part is to finish in the first step of described secondary operation.

Preferably, described second tie point is to finish in second step of described secondary operation.

Preferably, described handle comprises a spherical part at second tie point, when its was blown in second step that second operates, this spherical part was covered by the part part of container at least, thereby can form mechanical interlocked a connection at second tie point and the container of handle.

In a concrete preferred form, this spherical part comprises a hook that protrudes upward, a hook that stretches out downwards, the combination of a spherical part or one or more above-mentioned parts.

The accompanying drawing summary

Description describes embodiment of the present invention by example, in the accompanying drawing:

Fig. 1 is the side view of prior art parison;

Fig. 2 has the side view of the parison of feature according to an embodiment of the present invention;

Fig. 3 is the partial side view of the blow molding PET container that makes of preformed member according to an embodiment of the invention;

Fig. 4 has represented the manufacturing step of parison according to another embodiment of the invention;

Fig. 5 A is the side view of preformed member according to another embodiment of the invention;

Fig. 5 B is the side view of the container made by the preformed member among Fig. 5 A;

Fig. 6 is a side view that is in the mould of open mode that is used to produce preformed member;

Fig. 7 is the view that mould is in detent position among Fig. 6;

Fig. 8 is the side view of mould in Fig. 6 and 7, shows the preformed member handle that is positioned at wherein.

Accompanying drawing describes in detail

Shown in Figure 3 is according to a preferred embodiment of the invention container 10.It comprises a neck 11 and a dilation 12.

Neck 11 has a threaded portion 13 and a locating ring 14.Handle 15 is injected into one with ring 14, and the 15a of first of handle 15 is 14 protruding from encircling, and second portion 15b becomes certain inclination angle with the 15a of first, makes it intimate parallel with the vertical axis of container 10.In this case, the angle between 15a of first and the wall 20 is slightly larger than 45 °, and the angle of second portion 15b and wall 20 is about 20 °.

The selection of handle 15 concrete shapes makes, when it can be held by people's finger as handle the time.

The end 16 of handle 15 is roughly along the extension that is directed downwards of container 10 blind ends.

In this case, the cross section of handle 15 is the I type, is used for overcoming in the blowing operation of preformed member 10, on the tie point 17 of handle 15 and ring 14 or near ill effect.

Specifically, these ill effects comprise owing to the different inhomogeneous coolings that cause of varying cross-section place preformed member volume, thus stress effect that causes and air inclusions.

In this preferred embodiment of the present invention, preformed member is made by PET, and by using hot-die to prepare.

For producing container 10, can be with parison or preformed member 26 (see figure 2)s are put into a blow moulding machine (not shown) according to embodiments of the present invention, according to the biaxial stretching blow molding technology it is carried out blowing processing then, neck 11 is placed in the mould, and it can not expanded.At first, can the bottom of the downward mechanical stretching of expandable part of neck below preformed member to mould will be positioned at, then by using compressed air that the main body of preformed member is outwards blown, until support section 18 of 16 formation in the handle end, like this can be by to the blowing of container 10, in the process that is shaped, between the wall 20 of container 10 and handle 15, form a closed area 19.

In concrete preferred form of the present invention, there are enough cross-sectional areas closed area 19, makes it to allow at least two fingers of people insert wherein, supports container 10 thereby hold handle 15.

The purpose of carrying out blow molding operation is in order to carry out biaxial stretching by the molecule to preferred PET material, to make bottle or container have suitable strength, also can improving impermeability simultaneously, to reduce oxidation.

According to one embodiment of the invention, can make these partially crystallizables on the preformed member by neck 11 and handle 15 being carried out superheated.The crystallization process of handle has improved its rigidity, the consumption that this helps the orientation stretching of preformed member and reduces material.

The crystallization of neck and handle can be by watering deep fat on neck and handle, uses open frame or blow hot-air and realize.

The position of handle 15 on ring 14 guaranteed to disturb when the remainder to preformed member carries out blowing minimum.Can use one-level or two-stage approach.

Other embodiments describe in detail

Shown in Figure 1 is United States Patent (USP) the 4th, 629, the preformed member or the parison 21 of prior art in No. 598.Principle in the prior art disclosure is that the locating ring place on the not expandable part 22 of parison 21 forms a handle portion 23.

By referring to Fig. 2 and DESCRIPTION OF THE PREFERRED, will be according to the present invention in many aspects the design to Fig. 1 make amendment.

Illustration

2A, 2B and 2C have represented to constitute the shape of the spherical part 17 of handle end 16, are respectively hook-type 24a, spherical 24b and the upwardly extending hook-type 24c of downward extension.

Common ground on these part external forms be can both with the blowing part mechanical bond of container 10, blowing part can encase head 27.

Can carry out the second stage blowing to the expandable part 12 of parison 26, thereby the technology that handle end 16 heads 27 are wrapped is stretch blow, the biaxial stretching step.

Shown in Figure 4 is a kind of concrete grammar of producing parison according to another embodiment of the invention.It comprises the two-stage approach of using Shooting Technique that parison is shaped.In the stage 1, first injection moulding inlet 28 flows into plastic material, is used to form the dilation 12 (referring to Fig. 3, expanding in the blowing stage that container is shaped) of parison 26.

In the injection moulding process second stage that parison 26 is shaped, second injection moulding inlet 29 flows into plastic material, is used to form not expandable part 25 of parison 26.

The two-stage injec mode makes and can inject different plastic materials with second injection moulding inlet 29 by first injection moulding inlet 28.

In a particularly preferred form, the plastic materials that inject from first injection moulding inlet 28 are not recyclable or expendable basically plastic materials, and from the plastic materials that second injection moulding inlet 29 injects be callable or be at least can be partially recycled plastic material.

This mode can be controlled recyclable and the usage ratio of recyclable plastic material not, thereby can realize the optimum economy of parison 26 structures.

In a modification of this design, the step in stage 2 can not be included in and form the process that comprises

inwall

51 and 52 liang of walls of outer wall in the expandable part 25.Inwall 51 is made by pure or unpolluted PET material, and as the separation layer of the wall made from respect to recyclable material 52 52.Can produce double wall by using the slide core device, this device is a modification to the mould design and processes process that will be elaborated among following Fig. 6,7 and 8.

Certainly stage 1 and the stage 2 among Fig. 4 can exchange on order.

Fig. 5 A and B represented respectively according to another embodiment of the invention parison and the container of final production.Similar portions is identical with numbering in the embodiment of front.

In this embodiment, parison 21 comprises a locating ring 14, adjacent its below be first can not breathing space 30 and second can not breathing space 31.Formed first can not breathing space 30 can omit height or separate with the expandable part of parison 21.Second can not breathing space 31 can be not separate with the expandable part of parison 21, but in application, the blowing operation can guarantee that second can not expand breathing space 31 in the blowing process.

In this case, handle 15 comprises that one is connected as a single entity with locating ring 14 and from its first gusset 32 that stretches out.Handle 15 comprises that also one and second can not breathing space 31 be connected as a single entity and from its second gusset 33 that stretches out.Handle 15 comprises that also one and first can not breathing space 30 be connected as a single entity and from its gusset coupling part 34 of stretching out, this part is forming continuous connection on the handle 15 whole length directions between first gusset 32 and second gusset 33.

Then the above-mentioned method of 36 usefulness of the parison among Fig. 5 A is blown, thus the cavity 35 of container 37 shown in formation Fig. 5 B.When the expandable part 36 of parison 36 is formed the main cavity 35 of container 37 by biaxial stretching, comprise handle 15, ring 14, the first can not can not remain unchanged at interior neck breathing space 31 breathing space 30 and second.According to foregoing embodiment, handle end 16 can comprise spherical part, links to each other with container 37, perhaps alternately or extraly comprises the application adhesives, forms chemical bond by using chemical mediator between handle end 16 and chamber wall 17.

In a modification to Fig. 5 A and Fig. 5 B embodiment, first can not breathing space 30 and second can not breathing space 31 can constitute one separately can not the breathing space a part.

In another modification, second can not can be positioned at the temperature transition district of container in breathing space 31, thereby produces less expansion in the blowing step.

In another modification, first can not breathing space 30 and the second temperature transition district that can not breathing space 31 all can be positioned at adjacent locating ring 14 belows, and in the blowing process, these zones produce less expansion.

By referring to back two kinds of variation schemes, the advantage of following content as can be known just, promptly can come the expansion of limit temperature transition region by suitable extruded designs because and technology controlling and process, so can control by temperature transition district 30,31 by second gusset 33 and gusset coupling part 34 to the encircle 14 bad rugged change effect that is rigidly connected and causes of (or other expandable part not of neck 11).

In application, preformed member and can produce by following method by the container of its blowing:

Preformed member is made by the thermoplastic of orientable stretching, is preferably in to be PET or materials similar in the Shooting Technique.Fig. 6, the sliding mould shown in 7 and 8 comprises slide core 40, slide block 41, housing 42, base 43, pushing block 44 and split holder 45.Mould shown in Figure 6 is in the release position, and mould shown in Figure 7 is in detent position, and what Fig. 8 represented is handle 14 side view afterwards of packing into.

Complete preformed member second and also preferably independent step in by stretch blowing machine, preformed member is reheated to suitable transition temperature (referring to foreword) earlier there.Comprise locating ring 14 and handle 15 preformed member not expandable part by suitable baffle plate basically with reheat process and isolate.In most of the cases, probably at Fig. 5 A, 30,31 places, zone shown in the 5B form a temperature transition district.

The preformed member that will reheat is put into mould then, resembles to carry out biaxial stretching and expandable part is blown full size the prior art.In this process, preformed member also can support at handle 15 places at neck 14 places.Although the container outer wall that the end 16 of handle 15 may be blown to partly encases, handle 15 does not participate in the blowing process.

Foregoing only is some embodiment of the present invention, and those very conspicuous to those skilled in the art modifications also can be implemented under the condition that does not deviate from scope and spirit of the present invention.

Industrial usability

Embodiment of the present invention are applicable to the production container, and this container is by orientable stretched thermoplastic material Material is made, and comprises the handle that is connected as a single entity with container or similarly grasp annex.

Claims

1. the preformed member of a container, it comprises the thermoplastic of orientable stretching, its design makes final blown container comprise a handle or similar supporting construction; This preformed member comprises a compression-molded structures that has neck and be positioned at the expandable part of neck below, this neck comprises a locating ring that is positioned at the expandable part top, and one made by orientable drawn thermoplastic material, from the hard handle that locating ring stretches out and is connected as a single entity with it, this is firmly just formed handle when container is shaped.

2. a production has the method for integral catch container; This method comprises:

(a) form a preformed member, it has neck and an expandable part that is positioned at the neck below, this neck comprises that a locating ring that is positioned at expandable part top and one are made by orientable drawn thermoplastic material, stretches out and hard of being connected as a single entity with it from locating ring;

(b) described preformed member is carried out blow molding operation, expandable part is expanded, thereby form the housing of container.

3. the method for claim 2, wherein neck and integral catch all will pass through crystallization process.

4. the method for claim 2, wherein blow molding operation comprises the step of support handle when by some way preformed member being blown, this mode expand at least a portion in the pipe outside and encases the bottom of handle at least, thus outer wall and firmly between form the part of holding of a sealing.

5. the method for claim 4 is wherein sealed the size of holding part at least two fingers of adult can therefrom be passed.

6. the method for claim 2, wherein formed handle are at least at the cross section of its that part of I of having shape of stretching out from the pipe outer wall.

7. preformed member that is used for injection stretch blow molding process, this preformed member is to be made by the injecting method that comprises two independent injection points.

8. the preformed member of claim 7, wherein first injection point can allow to inject expendable PET or similar thermoplastic.

9. claim 7 or 8 preformed member, wherein second injection point can allow to inject the PET that comprises at least a portion recyclable material or similar thermoplastic.

10. claim 7 or 8 preformed member, wherein said first injection point is used to form will be stretched that part of in the process of preformed member being carried out the stretch-blow operation.

11. the preformed of claim 9, wherein said second injection point of part are used to form and will keep not expanding or non-bloating basically that part of in preformed member being carried out the process of stretch-blow operation.

12. a container that is made by two-stage injec stretch-blow technology, this container comprise one at least at first and second handles of holding that are connected on the container, thereby form a closed area between handle and bottle, people's finger can therefrom pass through.

13. the container of claim 12, wherein said first tie point comprise a whole coupling part between handle and container, and this connection is to finish in the first step of described two steps operation.

14. the container of claim 13, wherein said second tie point are to finish in the 2nd step of described two steps operation.

15. the container of claim 14, wherein said handle comprises a spherical part at the second tie point place, when being blown in its second step in the operation of two steps, encased by the part of container at least, formed mechanical interlocked a connection at handle with the second tie point place of container like this.

16. the container of claim 15, wherein said spherical part comprise a hook that protrudes upward, a hook that stretches out downwards, a spherical part or one or more above-mentioned combination.

17. arbitrary container in the claim 12 to 16 wherein uses adhesive to help at the second tie point place to connect.

18. the preformed member of claim 1, it also comprises a locating ring, this locating ring be positioned at adjacent first can not the breathing space and second can not the breathing space the below.

19. the preformed member of claim 18, wherein form first can not the breathing space a little more than or separate with the expandable part of parison.

20. the preformed member of claim 18 or 19, wherein second can not the breathing space separate with the expandable part of parison.

21. arbitrary preformed member among the claim 18-20, wherein handle comprises that one is connected as a single entity with locating ring and from its first gusset that stretches out.

22. the preformed member of claim 21, it comprises that also one and described second can not the breathing space be connected as a single entity and from its second gusset that stretches out.

23. the preformed member of claim 22, it comprises that also one and first can not the breathing space be connected as a single entity and from its gusset coupling part of stretching out, this part has formed a continuous connection along the whole length of handle between first gusset and second gusset.

24. arbitrary preformed member among the claim 18-23, wherein said second can not the breathing space has constituted the part in temperature transition district.

25. arbitrary preformed member among the claim 18-24, wherein said first can not the breathing space has constituted the part in temperature transition district.

26. the preformed member of claim 24 or 25, wherein the distortion in temperature transition district occurs in the stretch-blow technical process.

27. arbitrary preformed member among the claim 18-26, it is produced by the two-stage Shooting Technique, and wherein material injects mould at diverse location, thereby has formed the preformed member of being made by more than one materials.

28. the preformed member of claim 27 has wherein formed the inner and outer wall of preformed member at least one stage of two-stage approach, this inwall can be made by the material that is different from this outer wall.

29. a container is made by the stretched blowing of preformed member arbitrary among the claim 18-28.

30. a container is made by the PET material and by the stretched blowing of preformed member arbitrary among the claim 18-29.