NL1005059C2 - Preparation of products from thermoplastic foil - Google Patents

Preparation of products from thermoplastic foil Download PDF

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Publication number
NL1005059C2
NL1005059C2 NL1005059A NL1005059A NL1005059C2 NL 1005059 C2 NL1005059 C2 NL 1005059C2 NL 1005059 A NL1005059 A NL 1005059A NL 1005059 A NL1005059 A NL 1005059A NL 1005059 C2 NL1005059 C2 NL 1005059C2
Authority
NL
Netherlands
Prior art keywords
foil
mold part
mold
characterized
device
Prior art date
Application number
NL1005059A
Other languages
Dutch (nl)
Inventor
Zong Lang Chen
Original Assignee
Zong Lang Chen
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Zong Lang Chen filed Critical Zong Lang Chen
Priority to NL1005059A priority Critical patent/NL1005059C2/en
Priority to NL1005059 priority
Application granted granted Critical
Publication of NL1005059C2 publication Critical patent/NL1005059C2/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26Component parts, details or accessories; Auxiliary operations
    • B29C51/42Heating or cooling
    • B29C51/428Heating or cooling of moulds or mould parts
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/04Combined thermoforming and prestretching, e.g. biaxial stretching
    • B29C51/06Combined thermoforming and prestretching, e.g. biaxial stretching using pressure difference for prestretching
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26Component parts, details or accessories; Auxiliary operations
    • B29C51/30Moulds
    • B29C51/32Moulds having cutting means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26Component parts, details or accessories; Auxiliary operations
    • B29C51/42Heating or cooling
    • B29C51/426Producing specific thermal regimes during thermoforming to obtain particular properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00Shaping characteristics in general
    • B29C2791/004Shaping under special conditions
    • B29C2791/005Using a particular environment, e.g. sterile fluids other than air
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2791/00Shaping characteristics in general
    • B29C2791/004Shaping under special conditions
    • B29C2791/006Using vacuum
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00Shaping techniques involving a cutting or machining operation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10Forming by pressure difference, e.g. vacuum

Abstract

Deepened parts conform to the shape of the product to be produced. The foil (10) even partly is brought into contact with the first matrix (4) part, and from this part heat is applied on the foil in such a way that the parts of the foil which are more deformed by the introduction of the foil in the matrix part receive less heat than the other parts of the foil, whereby the other parts are heated to at least the deforming temperature of the foil.

Description

Title: Method and device for manufacturing products from a thermoplastic film.

Description: 5 The invention relates to a method and device for manufacturing products from a thermoplastic film, wherein the film is preformed in a first heated mold part and is subsequently introduced into a second cooled mold part, which recesses in accordance with the shape of the manufacture product.

It is generally known for the production of products from a thermoplastic film to introduce a film which is heated uniformly to above its deformation temperature by over- and / or underpressure in a cooled product mold. The heated foil is thereby deformed, stretched and stabilizes in its product form after abutting against the cooled walls of the product mold. The deformation and stretching then begin immediately after the application of the pressure difference and only ends when the foil touches the cold walls of the mold. Those parts of the foil which, in order to achieve the product shape, have to be stretched or deformed the most, come into contact with the cold walls only at a late moment and will therefore have the smallest wall thickness in the final product. This is less desirable under conditions because it means product weakening.

In order to at least somewhat obviate this phenomenon, DE-OS 27 24 987 discloses an apparatus and method as described in the preamble, in which a foil, the temperature of which is below its deformation temperature, is first introduced into a heated preform mold, the strongest parts to be deformed, in this case the wall of the product to be formed is brought into contact with these warm walls of the preform mold in a progressive manner. In this way, the most deformable parts of the foil progressively reach their deformation temperature, so that these parts show a lesser wall thickness reduction.

1005059 2

A drawback of this known method is that the parts of the film, which are not or hardly to be deformed, only come into contact with the warm walls of the preforming mold at the very last moment, so that during the deformation of the strongly deformable parts no material transport of the parts that are not deformable to the more deformable parts can occur. A further drawback of this known device and method is that the intermediate product formed in the preform mold has to be transported laterally from the preform mold and transported to the product mold. This transport of the intermediate product from the preform mold to the product mold is laborious, during which damage and cooling of the intermediate product may occur during this transport.

In a further device and method known from US 4,552,717, a film heated in its entirety to above its deformation temperature is first introduced into a preform mold and then into a cooled product mold. A drawback of this is that immediately when a pressure difference is applied over the foil, the entire foil will deform, whereby the strongly deformable parts will undergo a greater stretch than the other parts of the foil, so that the wall thickness thereof is to be desired again. leaves.

The object of the invention is to provide a method and apparatus of the type described above, wherein a suitable temperature distribution in the foil results in a product with a better desired wall thickness distribution.

In order to achieve the intended purpose, the method according to the invention is characterized in that the foil is brought into contact at least partly with the first mold part, whereby heat is supplied to the film from this mold part in such a way that those parts of the film, which are deformed more strongly when the film is introduced into the first mold part, are supplied with less heat than the other parts of the film, the other parts being heated to at least the deformation temperature 1005059 3 of the film, after which it is of a desired temperature-patterned foil in the first mold part is preformed and then pressed into the second mold part to obtain the final product shape, all this such that a product with a desired wall thickness distribution is obtained.

By providing the foil with a pattern of parts whose temperature is still below the deformation temperature and other parts with a temperature above the deformation temperature, according to the above-described method, the more deformation will occur when the foil is introduced into the preforming die. parts with a temperature still below the deformation temperature are progressively brought into contact with the walls of the first mold part, whereby these parts will then also reach their deformation temperature in a progressive manner. Particularly in the first phase of the introduction of the foil into the first mold part, material transport may then occur from the adjacent mold parts which already had a temperature from the beginning, corresponding to the deformation temperature, in the direction of those parts which are most deformed. must become. In this way, during the deformation of those parts which are to be most deformed, a less great reduction in thickness will occur than in known methods. In this way, by applying a suitable temperature distribution pattern in the foil, a product with a controlled wall thickness distribution will be obtained.

In a further favorable embodiment, the foil 30 can be preheated before being brought into contact with the first mold part. In a further favorable embodiment it is also possible to heat the side of the foil remote from the first mold part evenly by means of a heating device to a temperature which is above the deformation temperature of the foil. In this way, a temperature distribution can also be applied in the thickness direction of the foil, which is favorable for obtaining a product with a desired wall thickness distribution.

According to a further favorable embodiment, after the application of the desired temperature distribution pattern, the foil is pressed into the first mold part by means of a pressure difference. The pressure difference to be applied is preferably adjustable here, so that the speed with which the foil is pressed into the first mold part is adjustable. This can also exert a favorable influence on the wall thickness of the final product.

The invention further relates to a device for carrying out the above-described method, which device comprises a first heated mold part for preforming a thermoplastic film, and a second cooled mold part, which has recessed parts in accordance with the shape of a product to be manufactured. . This device is characterized in that the second mold part is arranged vertically above the first mold part, wherein means are present for moving this mold part up and down from an open to a closed position and in which the device further comprises a heating device, which is moved along a conveying path of the foil is movable and can be brought in a first position outside the mold parts and in a second position opposite the first mold part.

The further features of this device are shown in the claims and will be explained in more detail below with reference to the drawings.

Figure 1 shows schematically and not to scale an example of a device for manufacturing products from a thermoplastic film; Figure 2 shows schematically and in cross-section a combination of a mold and a preform die as used in the device according to figure 1 in closed condition;

Figure 3 and Figure 4 show in section and on an enlarged scale a part of the mold combination according to Figure 2;

Figure 5 shows schematically, not to scale, another embodiment of an apparatus for manufacturing 1005059 products from a thermoplastic material;

Figure 6 and Figure 7 each show a part of the device according to Figure 5, the mold and the preform die being shown in their open and 5 in their closed positions, respectively;

Figure 8 shows in cross-section and on an enlarged scale the combination of the mold and the preform mold in their open position with a heating device between them;

Figure 9 shows in cross-section and on an enlarged scale the combination of a mold and preform mold in their closed position;

Figures 10a and b each show a portion of the preform and mold die combination of Figure 9 with the foil in the preform die and the foil in the mold die, respectively;

In the device according to Figure 1, reference numeral 1 designates a carrier 1 for a roll of thermoplastic foil 10, which foil is fed stepwise through the device with the aid of a foil transport system 2. Thereby the foil 10 first passes the heating device 3, where the foil is heated to a temperature which is still below its deformation temperature. Thereafter, the foil is placed between a forming mold 4 and a preforming mold 5. The product 7 formed therein is then fed to a product stacker 8, while the rest of the foil is further transported to a grinding device 9. The molding mold 4 can herein move in vertical direction are moved up and down to an open and a closed position, respectively.

The combination of mold 4 and preform 5 is shown on an enlarged scale and in cross-section in figure 2.

The molding die 4, which can be moved up and down by means not shown, is provided with cooling water channels 44 and channels 43, which can be connected on the one hand to a device with which compressed air can be supplied to these channels or to a device with which air can be supplied to these channels be withdrawn. The channels 43 are connected via channels (not shown) to the surface 43 'of the 1005059 6 mold 4, so that air can be introduced between these molds 4 and 5 or extract air from this space via these channels. The mold 4 is provided with a recessed portion 4 'corresponding to the final shape of the product to be manufactured. The mold 4 is further provided with knives 41 for punching the manufactured product from the foil and with a rubber seal 42, with which the mold 4 can press against the mold 5. The mold 5 is arranged on a heating plate 52, which is provided with heating elements 54 and with air ducts 55, which can connect to a device for supplying compressed air and which ducts 55 connect via small air ducts to the top surface of the mold 4. The mold 5 is furthermore provided with a punching plate 51, 15 which cooperates with the punching knives 41.

The method of manufacturing a product continues as follows. The foil 10 preheated in the heating device 3 is placed on the preform die 5, after which the top die closes and the foil 10 is clamped between the rubber seal 42 and the punching plate 51. Compressed air is then supplied via the channels 43, which compressed air exerts a pressure on the top side of the foil 10 and the bottom side thus presses well against the preform die 5. The preform die 5 is kept by the heating elements 54 at a temperature which is above the deformation temperature of the foil 10 and heat of the preform die 5 is conducted via conduction transferred to those parts of the foil 10 which are pressed against the preform die. Those parts of the foil 10, 30 which bridge the recessed portion 60 and thus are not in contact with the preform die 5, will receive less heat than the rest of the foil and those parts will therefore maintain a temperature below their deformation temperature. After this, due to the air pressure which is exerted on the top side of the foil via the channels 43, the foil is pressed into the recessed portion 60 of the mold 5. The portion 61 of the foil, which thus still has a temperature, 1005059 7 below its deformation temperature, are slowly pressed into the recessed portion 60, the foil portion 61 progressively coming into contact with the walls of the recessed portions 60 and thus progressively obtain a temperature above the deformation temperature of the foil material. During this phase the part 61 will therefore be deformed, while during the deformation material from those parts of the foil, which adjoin the parts 61 and 10 which have a temperature that is above the deformation temperature from the beginning, is more or less along with it. be taken so that the wall thinning caused by the deformation is less than if no material will be supplied from the adjacent parts. This process is further illustrated in Figure 4a-d. It can clearly be seen from this that a pressure P acts on the top of the foil 10. As a result of this pressure, the foil 10 is pressed well against the molding die 5, so that at location A and E the temperature of the foil is above its deformation temperature.

Since the part 61 does not abut the walls of the mold 5, less heat will be supplied to that part, so that this part maintains a temperature below its deformation temperature. As can be seen from figure 4a, the thickness of the foil 10 at the points A, B, C, D 25 and E is the same everywhere. By the pressure P, the portion 61 is now pressed into the recessed portion 60, the portion 61 undergoing a deformation, as shown in Figure 4b. As can also be seen from this figure, the section 61 progressively comes into contact with the walls of the recessed section 61 and is heated there to its deformation temperature. In this way the film deforms in such a way that the middle part hardly changes in thickness, but that the parts A and B and D show a certain thinning, it also being clearly visible that a certain amount of material of the film 10 from the surface part 61 adjoining part of the foil is also drawn into recessed part 60. In this way, the foil is finally pressed entirely into the recessed portion 60 1005059 8, where at location c, i.e. at the bottom of the recess, the thickness of the foil 10 differs little from its original thickness and the thickness at location A and B less than the thickness of the original film. The same occurs on the other side, namely the thickness of the foil at location E and D is again smaller than the thickness of the original foil. After this phase, the film is pressed into the mold 4 by introducing compressed air through the air holes 54, as shown in Figure 4d. From this figure it can be seen that a final product is obtained with a certain desired wall thickness distribution. Optionally, the final wall thickness distribution can also be influenced by controlling the air pressure, with which the foil is pressed into the preform mold and mold.

Figure 5 schematically shows another embodiment of a device for manufacturing products from a thermoplastic film. This device again comprises a roll support 101 for a thermoplastic film 110, which can be transported through the device by means of a film transport system 102. The device further comprises a heating device for the foil, consisting of a bottom plate 103 and a heating hood 141 and 104, which can be moved to and fro by means of a device 105 along the transport path of the foil 110. The device further comprises a mold die 106, which is movable up and down, and a stationary preform die 107. The molded products can be stacked again in a stacker 108 and the waste material of the foil can be further processed in a mill 109.

Figure 6 shows the situation in which the mold die 106 is in its open position and the heating hood 104 is placed between the two dies 106 and 107.

Furthermore, figure 7 shows schematically the situation in which the mold 106 is in its closed position and the heating cap 104 is outside the range of the molds.

1 0 05 0 5 9 9

The situation of figure 6 is again shown on an enlarged scale in figure 8, with the mold die 106 being in its uppermost position and the heating cap 104 pressed between the two mold halves and against the preform die 107. The molding mold 106 again contains cooling water channels 163 and air channels 164, as well as cutting dies 161 and resilient pressing elements 162. Furthermore, this mold also contains ejectors 165, which are movable up and down and serve to eject the finished product from the mold. In this case too, the preform die 107 again contains heating elements 172 and air ducts 173 as well as temperature sensors 171. Furthermore, the molding die is again provided with a punching plate 174 for cooperation with the cutting dies 161. The heating cap 104 is arranged and pressed between the two mold halves 15. against the mold, so that it holds the foil 110 well pressed against the punching plate 174 via the pressing elements 162. In the heating hood 104 there is an infrared heating element 143, which supplies heat to that side of the foil 110, which is of the preform, by radiation. turned away. In this situation, those parts of the film 110 which are pressed against the preform die are supplied with heat from the preform die, so that those parts get a temperature above their deformation temperature, while the portions 201 which bridge the recessed portions 202 and thus not in contact with the wall of the mold, less heat is supplied, so that the temperature of the parts 201 remains below the deformation temperature. Then, by applying pressure above the film 110, the sections 201 are pressed into the recessed sections 202 in the same manner as in the arrangement of Figures 1 to 4.

The situation in which the foil 110 has been pressed completely into the recessed parts 202 of the molding die is shown in figure 9. In this situation, the heating cap 104 has been removed from the area of the molds and the molding die 106 has been lowered until it presses well against the foil 110 with the resilient pressing elements 162. Air is then supplied via the channels 173 to the surface of the molding die 1005059 and the preformed foil is pressed into the recessed parts of the molding die 106, until this foil comes to lie against the cold walls of that mold and thus the final 5 product is formed. The situation in which the foil 110 is still in the preform die 107 is shown in figure 10a, while in figure 10b the situation is shown in which the foil 110 is introduced into the mold die 106 and the mold is moved slightly further by means of 10 the cutting dies 161, the product has been punched out of the foil.

1005059

Claims (11)

1. A method for manufacturing products from a thermoplastic film, wherein the film is preformed in a first heated mold part and subsequently placed in a second cooled mold part, which has recessed parts in accordance with the shape of the product to be manufactured, characterized in that that the foil is brought into at least partial contact with the first mold part, wherein heat is supplied from this mold part to the foil in such a way that those parts of the foil which become stronger when the foil is introduced into the first mold part deformed, less heat is supplied than the other parts of the foil, the other parts being heated to at least the deformation temperature of the foil, after which the foil provided with a desired temperature pattern is preformed in the first mold part and then in the second mold part pressed to obtain the final product shape, all this 20 such that a product with a desired wall thickness distribution is obtained.
Method according to claim 1, characterized in that the foil is preheated before being brought into contact with the first mold part.
Method according to claim 1 or 2, characterized in that the side of the film remote from the first mold part is heated uniformly to a temperature above the deformation temperature of the film by means of a heating device.
Method according to claim 1, 2 or 3, characterized in that, after applying the desired temperature distribution pattern, the foil is pressed into the first mold part by means of a pressure difference.
5. Method according to claim 4, characterized in that the pressure difference and thereby the speed with which the foil is pressed into the first mold part is adjustable.
Device for carrying out the method according to one or more of the preceding claims, comprising 1005059 a first heated mold part for preheating a thermoplastic film and a second cooled mold part, which has recessed parts in the form of a product to be manufactured. characterized in that the second mold part is arranged vertically above the first mold part and means are present for moving this mold part up and down from an open to a closed position, the device further comprising a heating device, which along the conveying path of the foil is movable and can be pressed in a first position outside the mold parts and in a second position opposite the first mold part.
7. Device as claimed in claim 6, characterized in that the heating device is provided with clamping means for clamping the edges of the foil in its second position against the first mold part.
8. Device as claimed in claim 7, characterized in that means are present for generating a pressure difference over the foil, in order to press it into the first mold part.
Device as claimed in claims 6, 7 or 8, characterized in that means are present for pressing the foil from the first mold part directly into the second mold part in the first closed position of the second mold part.
10. Device as claimed in claim 9, characterized in that the means are formed by a device which can create a pressure difference over the foil.
11. Device according to one or more of claims 6 to 10, characterized in that the means for creating a pressure difference over the foil are adjustable, such that the foil has an adjustable speed in the first and / or second mold part. can be pressed. 1005059
NL1005059A 1997-01-22 1997-01-22 Preparation of products from thermoplastic foil NL1005059C2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
NL1005059A NL1005059C2 (en) 1997-01-22 1997-01-22 Preparation of products from thermoplastic foil
NL1005059 1997-01-22

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
NL1005059A NL1005059C2 (en) 1997-01-22 1997-01-22 Preparation of products from thermoplastic foil

Publications (1)

Publication Number Publication Date
NL1005059C2 true NL1005059C2 (en) 1998-07-27

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Family Applications (1)

Application Number Title Priority Date Filing Date
NL1005059A NL1005059C2 (en) 1997-01-22 1997-01-22 Preparation of products from thermoplastic foil

Country Status (1)

Country Link
NL (1) NL1005059C2 (en)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3341895A (en) * 1966-03-15 1967-09-19 Monsanto Co Molding machines
EP0079682A1 (en) * 1981-10-16 1983-05-25 Plastona (John Waddington) Limited Method of producing plastics material containers
US4552717A (en) * 1984-06-26 1985-11-12 Cosden Technology, Inc. Process for making a thin walled container from a plastic resin
EP0186729A1 (en) * 1984-12-20 1986-07-09 Multivac Sepp Haggenmüller Kg Packaging machine
US4842742A (en) * 1986-08-25 1989-06-27 Whirlpool Corporation Method for forming large objects such as refrigerator liners from crystalline synthetic resins

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3341895A (en) * 1966-03-15 1967-09-19 Monsanto Co Molding machines
EP0079682A1 (en) * 1981-10-16 1983-05-25 Plastona (John Waddington) Limited Method of producing plastics material containers
US4552717A (en) * 1984-06-26 1985-11-12 Cosden Technology, Inc. Process for making a thin walled container from a plastic resin
EP0186729A1 (en) * 1984-12-20 1986-07-09 Multivac Sepp Haggenmüller Kg Packaging machine
US4842742A (en) * 1986-08-25 1989-06-27 Whirlpool Corporation Method for forming large objects such as refrigerator liners from crystalline synthetic resins

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