WO1987000792A1 - Procede de formation de produits emboitables - Google Patents

Procede de formation de produits emboitables Download PDF

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Publication number
WO1987000792A1
WO1987000792A1 PCT/GB1986/000455 GB8600455W WO8700792A1 WO 1987000792 A1 WO1987000792 A1 WO 1987000792A1 GB 8600455 W GB8600455 W GB 8600455W WO 8700792 A1 WO8700792 A1 WO 8700792A1
Authority
WO
WIPO (PCT)
Prior art keywords
products
silicone
nestable
forming
release agent
Prior art date
Legal status (The legal status 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 status listed.)
Ceased
Application number
PCT/GB1986/000455
Other languages
English (en)
Inventor
David John Buckler
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Agricultural Packaging & Containers (sales) Limite
PLASVAC Ltd
Original Assignee
Agricultural Packaging & Containers (sales) Limite
PLASVAC Ltd
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 Agricultural Packaging & Containers (sales) Limite, PLASVAC Ltd filed Critical Agricultural Packaging & Containers (sales) Limite
Priority to GB08706735A priority Critical patent/GB2191422A/en
Publication of WO1987000792A1 publication Critical patent/WO1987000792A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C37/00—Component parts, details, accessories or auxiliary operations, not covered by group B29C33/00 or B29C35/00
    • B29C37/0067—Using separating agents during or after moulding; Applying separating agents on preforms or articles, e.g. to prevent sticking to each other
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00—Moulds or cores; Details thereof or accessories therefor
    • B29C33/56—Coatings, e.g. enameled or galvanised; Releasing, lubricating or separating agents
    • B29C33/60—Releasing, lubricating or separating agents
    • B29C33/62—Releasing, lubricating or separating agents based on polymers or oligomers
    • B29C33/64—Silicone
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping 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

Definitions

  • the present invention relates to a method of forming nestable products of plastics material.
  • Such products may be containers used, for example, for the packing of foodstuffs in the food industry or as seedtrays in the horticultural industry.
  • the invention is relevant to nestable plastics products for any purpose.
  • a method of. forming nestable products of plastics material including the step of applying a release agent to the plastics material, the release agent comprising a water- based silicone.
  • the invention also provides an apparatus for forming nestable products of plastics material, comprising means to apply the release agent to the material.
  • the release agent is sprayed onto each product after it is vacuum moulded from a plastic sheet. The heat stored in the product at this stage helps to dry the release agent.
  • the release agent may be sprayed onto the plastics sheet immediately after extrusion or as the sheet is unrolled from a roll before moulding.
  • the release agent could also be applied by passing the sheet, or the containers, through a bath rather than by spraying, or by a sponge roller fed by gravity from a wick as the sheet is unrolled or extruded. Further, if the products are containers for food, the release agent must be of a food grade.
  • Figure 1 of the drawing shows a schematic view of a manufacturing line for the production of nestable containers of plastics material
  • Figure 2 shows a separate unit for applying the release agent.
  • a roll 1 of sheet plastics material 2 is fed through a heater 3- Thereafter, the material 2 passes to the forming station 4 in which it is moulded to form the products 9- The material is then cut in a cutting station 5 to form lines of weakness. Next, the material is separated into sheets of individual products in a guillotine or punching station 6.
  • the individual sections of the material 2 are shaped in the forming station 4 in a conventional manner, e.g. by forming a vacuum within the mould 5 and sucking in the hot plastics material. After the material has cooled sufficiently, it is released from the mould by an injection of compressed air.
  • the sheet may be formed of polystyrene, polyvinyl- chloride, polypropylene, polyethylene or A.B.S. for example.
  • Fig. 1 are shown three examples of where in the manufacturing line the release agent may be applied.
  • the spray nozzle 7 is arranged between the forming station 4 and the cutting station 5.
  • the nozzle 7 may be above or below the material 2, or both.
  • a row of nozzles can be used. It has been found that the position at which the release agent is applied is not critical, provided of course that it is applied before the sheets of containers are stacked together. The containers should also be given time to dry out, i.e. time for the water to evaporate to leave the coating of silicone.
  • the timing of the spray nozzle 7 is linked into the moulding/cutting so that the spray is activated a fixed time after the sheet is released from the mould.
  • the plastics material is generally still hot enough t.o evaporate the water.
  • This apparatus comprises a conveyor belt 10 on which the individual products 11 are conveyed past spray unit 12 providing a fine mist and through heat chamber 13- At the top of the apparatus there are air extracts 14 adjacent the spray unit 12 and at the bottom a drain 15.
  • the spray timing can be controlled by a photo-cell 16, or, if the apparatus is linked to the forming machine, it can be linked to the moulding cycle. As the sprayed products pass through the heat chamber the water is evaporated so that they emerge dry and ready for immediate nesting.
  • M 400 This is a silicone release emulsion which is non-food grade but is water based and dilutable in 50/100 parts of water. 2.
  • Ref. BC 350 This contains polydimethylsiloxanes of various viscosities. It can be diluted using solvents such as white spirit or kerosine.
  • BC 360 This contains compounds of poly ⁇ dimethylsiloxane fluid and silicon filter. As with BC 350, it can be diluted with solvents.
  • Rocol MRS This is a non-silicone dry film spray based on a solid fluorocarbon telomer. It is solvent based but non-dilutable and so is very expensive. It is, however, food approved.
  • Rocol RS7 This is a non-silicone wet film spray which is not food approved, is solvent based and is non- dilutable.
  • Rocol PR This is a silicone release spray which is food approved but is not dilutable. It is expensive and also the spraying time proved to be critical and thus difficult to control.
  • silicone-water emulsions could be economically applied as release agents to avoid denesting problems.
  • Such emulsions should be diluted before use, a 35% silicone emulsion typically being diluted in from 10 to 100 parts of water, preferably 20 to 40 parts.
  • the silicones come in varying viscosities, generally from 300 to 60,000 cs. The lower viscosity silicones around 300 to 1,000 cs, were found to be more suitable for preventing the nestable products from sticking together.
  • the silicones tested by the applicants were dimethyl- polysiloxanes, though other siloxanes such as diphenyl- polysiloxa ⁇ ie would work in the same way. However, such other silicones would be more expensive.

Landscapes

  • Compositions Of Macromolecular Compounds (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Le procédé ci-décrit permettant de former des produits emboîtables en matériau plastique comprend une étape d'application d'un agent de démoulage sur chaque produit, avant ou après moulage, en vaporisant un fluide de silicone à base d'eau sur une surface du produit. Ce procédé permet d'éviter les problèmes de désemboîtement ultérieurs.
PCT/GB1986/000455 1985-07-31 1986-07-31 Procede de formation de produits emboitables Ceased WO1987000792A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08706735A GB2191422A (en) 1985-07-31 1986-07-31 Method of forming nestable products

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8519317 1985-07-31
GB858519317A GB8519317D0 (en) 1985-07-31 1985-07-31 Nestable products

Publications (1)

Publication Number Publication Date
WO1987000792A1 true WO1987000792A1 (fr) 1987-02-12

Family

ID=10583130

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB1986/000455 Ceased WO1987000792A1 (fr) 1985-07-31 1986-07-31 Procede de formation de produits emboitables

Country Status (4)

Country Link
EP (1) EP0231314A1 (fr)
AU (1) AU6198786A (fr)
GB (2) GB8519317D0 (fr)
WO (1) WO1987000792A1 (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852084A (en) * 1987-01-16 1989-07-25 Alcatel N.V. Information transmission system
WO1992005026A1 (fr) * 1990-09-13 1992-04-02 Wellstar Holding B.V. Preforme pour bouteille en polyester

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2870043A (en) * 1954-06-03 1959-01-20 Du Pont Printable polyethylene film
GB814899A (en) * 1951-04-16 1959-06-17 Bradford Dyers Ass Ltd Improved water-repellent finishes
US3409460A (en) * 1966-04-08 1968-11-05 Itt Rayonier Inc Emulsion coating of cellulosic films
FR2364951A1 (fr) * 1976-09-16 1978-04-14 Wacker Chemie Gmbh Emulsions aqueuses de polydiorganosiloxanes et leurs utilisations
DE3120982A1 (de) * 1980-05-28 1982-06-03 Shin-Etsu Chemical Co., Ltd., Tokyo Diorganopolysiloxane

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB814899A (en) * 1951-04-16 1959-06-17 Bradford Dyers Ass Ltd Improved water-repellent finishes
US2870043A (en) * 1954-06-03 1959-01-20 Du Pont Printable polyethylene film
US3409460A (en) * 1966-04-08 1968-11-05 Itt Rayonier Inc Emulsion coating of cellulosic films
FR2364951A1 (fr) * 1976-09-16 1978-04-14 Wacker Chemie Gmbh Emulsions aqueuses de polydiorganosiloxanes et leurs utilisations
DE3120982A1 (de) * 1980-05-28 1982-06-03 Shin-Etsu Chemical Co., Ltd., Tokyo Diorganopolysiloxane

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4852084A (en) * 1987-01-16 1989-07-25 Alcatel N.V. Information transmission system
WO1992005026A1 (fr) * 1990-09-13 1992-04-02 Wellstar Holding B.V. Preforme pour bouteille en polyester

Also Published As

Publication number Publication date
EP0231314A1 (fr) 1987-08-12
GB8519317D0 (en) 1985-09-04
GB8706735D0 (en) 1987-04-23
AU6198786A (en) 1987-03-05
GB2191422A (en) 1987-12-16

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