EP0101500A1 - Thermoformage de feuilles en plastique co-extrudees - Google Patents

Thermoformage de feuilles en plastique co-extrudees

Info

Publication number
EP0101500A1
EP0101500A1 EP83901009A EP83901009A EP0101500A1 EP 0101500 A1 EP0101500 A1 EP 0101500A1 EP 83901009 A EP83901009 A EP 83901009A EP 83901009 A EP83901009 A EP 83901009A EP 0101500 A1 EP0101500 A1 EP 0101500A1
Authority
EP
European Patent Office
Prior art keywords
thermoforming
layers
objects
sheet
plastic
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.)
Withdrawn
Application number
EP83901009A
Other languages
German (de)
English (en)
Inventor
Laszlo J. Bonis
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.)
Composite Container Corp
Original Assignee
Composite Container Corp
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 Composite Container Corp filed Critical Composite Container Corp
Publication of EP0101500A1 publication Critical patent/EP0101500A1/fr
Withdrawn legal-status Critical Current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
    • 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
    • B29C51/14—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 using multilayered preforms or sheets
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
    • B29C48/307—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets specially adapted for bringing together components, e.g. melts within the die
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels

Definitions

  • the invention relates to preparing objects thermoformed from p astic sheets.
  • Plastic sheets are often produced by appara ⁇ tus in which plastic material is heated and sup ⁇ plied under pressure to an extrusion die. The sheets can then be thermoformed to a desired shape, and individual objects can be trimmed from the thermoformed sheet.
  • the invention features coextruding a multilayered sheet having adjacent layers of plastics that do not bond to each other during co ⁇ extrusion, thermoforming the multilayered sheet, and separating individual thermoformed objects of different layers.
  • the produc ⁇ tivity of the extrusion, thermoforming, and trim ⁇ ming apparatus is multiplied by the number of layers in the sheet.
  • one of the plastics in the multilayered sheet is polystyrene and another plastic is polypropylene; in some preferred embodiments one plastic is for a separator layer between plastic layers for the thermoformed objects, and in other preferred embodiments the thermoformed objects are made from more than one of the plastics of the layers of the multilayered sheet.
  • the thermoforming of the multilayered sheet with poly ⁇ propylene and polystyrene layers is faster. than the slow, and therefore expensive, thermoforming of polypropylene alone- Description of the Preferred Embodiment
  • draw ⁇ ing is a diagrammatic view of a process of manufacturing plastic objects according to the in ⁇ vention.
  • Two heated containers 16, 18 serve as sources of the polystyrene (70% crystal styrene and ' 30% rub ⁇ ber modifying plastomer sold by Phillips Chemical Company under the trade designation Solprene 416P, a block polymer having a butadiene/styrene ratio of 70/30, a molecular weight of 140 M, a density of 0.94, and a melt flow index of 2 decigrams/ in) , and polypropylene- (available from Rexene Company, Paramus, New Jersey, and having a meltr flow index of 4 decigrams/ in) , respectively.
  • Solprene 416P a block polymer having a butadiene/styrene ratio of 70/30, a molecular weight of 140 M, a density of 0.94, and a melt flow index of 2 decigrams/ in)
  • polypropylene- available from Rexene Company, Paramus, New Jersey, and having a meltr flow index of 4 decigrams/
  • Conduits 20, 22, 24, 26, 28 supply the heated materials to coextrusion block ' 30. There the ma ⁇ terials merge together to form under pressure a unitary, five-layer thick stream ' 32 of generally circular cross section. Stream ' 32 passes into extrusion die ' 34 "(e.g. , Welex standard 54" flex- lip die) for extrusion into continuous sheet ' 36. Sheet ' 36 then passes through a series of chill rolls 38.
  • extrusion die ' 34 "(e.g. , Welex standard 54" flex- lip die)
  • the sheet after coextrusion, may then be thermoformed into bowls or wound into spools (not shown) for storage and later themoforming.
  • thermoforming apparatus 40 the vacuum forming type well known in the art
  • the shaped sheet 42 passes through trim press 44, in which the indivi ⁇ dual bowls 12 and 14 are trimmed. Because the polypropylene and polystyrene of bowls 12, 14, respectively, do not bond to each other during coextrusion or thermoforming, bowls 12, 14 can be easily separated from each other.
  • the simultaneous coextruding of five sheets and thermoforming and trimming of five bowls act to increase the produc ⁇ tivity of the coextrusion, thermoforming, and trimming apparatus. by a factor of five. Also, the thermoforming of the five-layer sheet is faster than the slow, and therefore expensive, thermoform ⁇ ing of polypropylene alone.
  • plastics that do not bond to each other can be used in place of the polystyrene and polypropy ⁇ lene.
  • one of the plastic layers could be a thin separator layer which would be used for scrap after separating the thermoformed objects from each other.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Laminated Bodies (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

Procédé de production d'objets en plastique par thermoformage (12, 14) consistant à co-extruder une feuille multicouches (36) possédant des couches adjacentes de plastique qui ne collent pas les unes aux autres pendant la co-extrusion, à façonner par thermoformage la feuille multicouches (36) et à séparer des objets individuels thermoformés (12, 14) de couches différentes.
EP83901009A 1982-02-04 1983-02-04 Thermoformage de feuilles en plastique co-extrudees Withdrawn EP0101500A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US34593882A 1982-02-04 1982-02-04
US345938 1982-02-04

Publications (1)

Publication Number Publication Date
EP0101500A1 true EP0101500A1 (fr) 1984-02-29

Family

ID=23357183

Family Applications (1)

Application Number Title Priority Date Filing Date
EP83901009A Withdrawn EP0101500A1 (fr) 1982-02-04 1983-02-04 Thermoformage de feuilles en plastique co-extrudees

Country Status (3)

Country Link
EP (1) EP0101500A1 (fr)
CA (1) CA1198562A (fr)
WO (1) WO1983002747A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2541628B1 (fr) * 1983-02-25 1988-07-08 Roquette Freres Procede et installation perfectionnes pour la fabrication du carton ondule
US4657151A (en) * 1984-04-12 1987-04-14 Baxter Travenol Laboratories, Inc. Container such as a nursing container, with flexible liner
DE4101106A1 (de) * 1991-01-16 1992-07-23 Krauss Maffei Ag Verfahren und vorrichtung zum herstellen laminierter formteile
ES2049576B1 (es) * 1991-06-28 1996-02-16 Suprametal S A Procedimiento de fabricacion de signos de identificacion y producto resultante
GB2284569A (en) * 1993-12-08 1995-06-14 Rolls Royce Plc Manufacture of similarly shaped components
US10618610B2 (en) 2017-05-11 2020-04-14 Vista Outdoor Operations Llc Watersport boards and methods for forming the same

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2270185A (en) * 1940-08-15 1942-01-13 Dow Chemical Co Simultaneous manufacture of containers and closures
US4048428A (en) * 1961-12-05 1977-09-13 W. R. Grace & Co. Method for preparing a film of vinylidene chloride polymer
US3322870A (en) * 1965-04-06 1967-05-30 Union Carbide Corp Method of producing clear, crystalline, high-gloss thermoplastic film
US3494993A (en) * 1968-01-29 1970-02-10 Dow Chemical Co Extrusion of wide thermoplastic film and sheet
US3977153A (en) * 1970-11-06 1976-08-31 The Dow Chemical Company Container for food products and method for making same
DE2114065C2 (de) * 1971-03-23 1982-08-19 Heinrich Pannenbecker Verfahren zur Herstellung von Folien aus thermoplastischen Kunststoffen mit Klebereigenschaft
US3971866A (en) * 1974-06-07 1976-07-27 Minnesota Mining And Manufacturing Company Thermoformable release liner

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8302747A1 *

Also Published As

Publication number Publication date
CA1198562A (fr) 1985-12-31
WO1983002747A1 (fr) 1983-08-18

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Legal Events

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PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

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AK Designated contracting states

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STAA Information on the status of an ep patent application or granted ep patent

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18D Application deemed to be withdrawn

Effective date: 19840105

RIN1 Information on inventor provided before grant (corrected)

Inventor name: BONIS, LASZLO J.