FR2235781A1 - Vacuum forming optical quality sheet between rubber covers - to eliminate post polishing of mould marks or chill patterns - Google Patents

Vacuum forming optical quality sheet between rubber covers - to eliminate post polishing of mould marks or chill patterns

Info

Publication number
FR2235781A1
FR2235781A1 FR7324791A FR7324791A FR2235781A1 FR 2235781 A1 FR2235781 A1 FR 2235781A1 FR 7324791 A FR7324791 A FR 7324791A FR 7324791 A FR7324791 A FR 7324791A FR 2235781 A1 FR2235781 A1 FR 2235781A1
Authority
FR
France
Prior art keywords
sheet
mould
rubber
optical quality
chill
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.)
Granted
Application number
FR7324791A
Other languages
French (fr)
Other versions
FR2235781B1 (en
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.)
BIGNON LOUIS
Original Assignee
BIGNON LOUIS
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 BIGNON LOUIS filed Critical BIGNON LOUIS
Priority to FR7324791A priority Critical patent/FR2235781A1/en
Publication of FR2235781A1 publication Critical patent/FR2235781A1/en
Application granted granted Critical
Publication of FR2235781B1 publication Critical patent/FR2235781B1/fr
Granted 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
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/28—Component parts, details or accessories; Auxiliary operations for applying pressure through the wall of an inflated bag or diaphragm
    • 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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/02—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles
    • B29C43/10—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies
    • B29C43/12—Isostatic pressing, i.e. using non-rigid pressure-exerting members against rigid parts or dies using bags surrounding the moulding material or using membranes contacting the moulding material

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

Heated thermoplastic sheets to be vacuum formed to produce optical quality mouldings are clamped between twin elastic sheets, which are sealed by the mould cavity clamps. The inner sheet features groups of perforations which align with the vents in the mould wall to allow total evacuation of the interfaces between (a) the rubber sheet and the mould wall, and (b) the rubber sheet and the thermoplastic sheet. Used esp. for mfr. of blisters or cockpits for aircraft, helicopters, etc. which require optical grade clarity and surface finish. The rubber liners provide a clean surface which is not as prone as the mould cavity walls to contamination between cycles, and surface temp. gradients which are less likely to promote optical anisotropy in the moulded sheet than metal surfaces on a jacket-controlled mould. Mouldings are fit for use without subsequent cleaning or polishing to remove dirt or 'toad skin' optical aberrations due to selective quenching of the sheet surface.
FR7324791A 1973-07-05 1973-07-05 Vacuum forming optical quality sheet between rubber covers - to eliminate post polishing of mould marks or chill patterns Granted FR2235781A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7324791A FR2235781A1 (en) 1973-07-05 1973-07-05 Vacuum forming optical quality sheet between rubber covers - to eliminate post polishing of mould marks or chill patterns

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7324791A FR2235781A1 (en) 1973-07-05 1973-07-05 Vacuum forming optical quality sheet between rubber covers - to eliminate post polishing of mould marks or chill patterns

Publications (2)

Publication Number Publication Date
FR2235781A1 true FR2235781A1 (en) 1975-01-31
FR2235781B1 FR2235781B1 (en) 1976-05-07

Family

ID=9122151

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7324791A Granted FR2235781A1 (en) 1973-07-05 1973-07-05 Vacuum forming optical quality sheet between rubber covers - to eliminate post polishing of mould marks or chill patterns

Country Status (1)

Country Link
FR (1) FR2235781A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139586A (en) * 1976-03-03 1979-02-13 Redifon Flight Simulation Ltd. Method of forming articles from thermoplastics sheet by free-blowing
EP0017452A1 (en) * 1979-03-30 1980-10-15 STOREY BROTHERS & COMPANY LIMITED Method of making a shaped structure
EP0095121A2 (en) * 1982-05-16 1983-11-30 Kurt Hacker Method of and apparatus for manufacturing a flat mirror body of at least partially curved thermoplastic material
EP0584017A1 (en) * 1992-08-20 1994-02-23 Gec Alsthom Acb Press for forming an object made of composite material with reinforcing fibres in a polymeric matrix

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU51783A1 (en) * 1965-08-20 1966-10-18
GB1184328A (en) * 1968-03-01 1970-03-11 Union Carbide Corp Thermoforming Method and Apparatus

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU51783A1 (en) * 1965-08-20 1966-10-18
GB1184328A (en) * 1968-03-01 1970-03-11 Union Carbide Corp Thermoforming Method and Apparatus

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4139586A (en) * 1976-03-03 1979-02-13 Redifon Flight Simulation Ltd. Method of forming articles from thermoplastics sheet by free-blowing
EP0017452A1 (en) * 1979-03-30 1980-10-15 STOREY BROTHERS & COMPANY LIMITED Method of making a shaped structure
EP0095121A2 (en) * 1982-05-16 1983-11-30 Kurt Hacker Method of and apparatus for manufacturing a flat mirror body of at least partially curved thermoplastic material
EP0095121A3 (en) * 1982-05-16 1986-01-29 Kurt Hacker Method of and apparatus for manufacturing a flat mirror body of at least partially curved thermoplastic material
EP0584017A1 (en) * 1992-08-20 1994-02-23 Gec Alsthom Acb Press for forming an object made of composite material with reinforcing fibres in a polymeric matrix
FR2694906A1 (en) * 1992-08-20 1994-02-25 Acb Press for forming a piece of composite material comprising fibrous reinforcements in a polymer matrix.
US5378134A (en) * 1992-08-20 1995-01-03 Acb Press for forming an article of composite material comprising reinforcing fibers in a polymer matrix

Also Published As

Publication number Publication date
FR2235781B1 (en) 1976-05-07

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