FR2171012A1 - Moulding by high frequency heating - with the cavity and the moulding material evacuated to eliminate bubbles - Google Patents

Moulding by high frequency heating - with the cavity and the moulding material evacuated to eliminate bubbles

Info

Publication number
FR2171012A1
FR2171012A1 FR7204772A FR7204772A FR2171012A1 FR 2171012 A1 FR2171012 A1 FR 2171012A1 FR 7204772 A FR7204772 A FR 7204772A FR 7204772 A FR7204772 A FR 7204772A FR 2171012 A1 FR2171012 A1 FR 2171012A1
Authority
FR
France
Prior art keywords
moulding
high frequency
cavity
frequency heating
pref
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Withdrawn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
FR7204772A
Other languages
French (fr)
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.)
SIFSA
Original Assignee
SIFSA
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 SIFSA filed Critical SIFSA
Priority to FR7204772A priority Critical patent/FR2171012A1/en
Publication of FR2171012A1 publication Critical patent/FR2171012A1/en
Withdrawn legal-status Critical Current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
    • B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • 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
    • B29C37/006—Degassing moulding material or draining off gas during moulding
    • 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
    • B29C43/021—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles characterised by the shape of the surface
    • 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
    • B29C43/32—Component parts, details or accessories; Auxiliary operations
    • B29C43/56—Compression moulding under special conditions, e.g. vacuum
    • 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
    • B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/12—Dielectric heating
    • 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

Abstract

Thermoformings or mouldings of synthetic resin shaped by press. with the aid of high frequency electrical heating, where the material is degassed prior to application of the h.f. field. Pref. degassing is achieved by evacuation prior to and during introduction of the material, throughout the moulding cycle. Alternatively degassing may be promoted by pressing a porous cloth on to the surface of the cast resin or paste, using a device which generates a progressive increase in press. PRef. the mould is charged with a controlled dose of material from an evacuated reservoir. For moulding e.g. PVC fluid, paste or powder compsns. to obtain items free from bubbles or surface pitting.
FR7204772A 1972-02-07 1972-02-07 Moulding by high frequency heating - with the cavity and the moulding material evacuated to eliminate bubbles Withdrawn FR2171012A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
FR7204772A FR2171012A1 (en) 1972-02-07 1972-02-07 Moulding by high frequency heating - with the cavity and the moulding material evacuated to eliminate bubbles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7204772A FR2171012A1 (en) 1972-02-07 1972-02-07 Moulding by high frequency heating - with the cavity and the moulding material evacuated to eliminate bubbles

Publications (1)

Publication Number Publication Date
FR2171012A1 true FR2171012A1 (en) 1973-09-21

Family

ID=9093408

Family Applications (1)

Application Number Title Priority Date Filing Date
FR7204772A Withdrawn FR2171012A1 (en) 1972-02-07 1972-02-07 Moulding by high frequency heating - with the cavity and the moulding material evacuated to eliminate bubbles

Country Status (1)

Country Link
FR (1) FR2171012A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2803558A1 (en) * 2000-01-11 2001-07-13 Gouillardon Gaudry METHOD FOR PRODUCING AND PLACING AN ELASTOMERIC ENVELOPE AROUND A FULL OR HOLLOW BODY

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2803558A1 (en) * 2000-01-11 2001-07-13 Gouillardon Gaudry METHOD FOR PRODUCING AND PLACING AN ELASTOMERIC ENVELOPE AROUND A FULL OR HOLLOW BODY
WO2001051268A1 (en) * 2000-01-11 2001-07-19 Gouillardon Gaudry Sa Method for placing an elastomer envelope around an elongated body

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Legal Events

Date Code Title Description
ST Notification of lapse