FR2018976A1 - Moulding of expandable thermoplastic beads esp of - polystyrene - Google Patents

Moulding of expandable thermoplastic beads esp of - polystyrene

Info

Publication number
FR2018976A1
FR2018976A1 FR6933051A FR6933051A FR2018976A1 FR 2018976 A1 FR2018976 A1 FR 2018976A1 FR 6933051 A FR6933051 A FR 6933051A FR 6933051 A FR6933051 A FR 6933051A FR 2018976 A1 FR2018976 A1 FR 2018976A1
Authority
FR
France
Prior art keywords
mould
plugs
beads
esp
inlet
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Withdrawn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
FR6933051A
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.)
CAPLAN FURNITURE Ltd
Original Assignee
CAPLAN FURNITURE 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
Priority claimed from GB28474/69A external-priority patent/GB1261718A/en
Application filed by CAPLAN FURNITURE Ltd filed Critical CAPLAN FURNITURE Ltd
Publication of FR2018976A1 publication Critical patent/FR2018976A1/en
Priority claimed from US00198766A external-priority patent/US3809735A/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Withdrawn legal-status Critical Current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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/3415—Heating or cooling
    • B29C44/3426—Heating by introducing steam in the mould
    • 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
    • B29C33/10—Moulds or cores; Details thereof or accessories therefor with incorporated venting means
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
    • B29C44/44—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form
    • B29C44/445—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length in solid form in the form of expandable granules, particles or beads
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/58—Moulds

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)

Abstract

Moulding of expandable thermoplastic beads esp of polystyrene. N-. Treated with a blowing agent such as pentane, in a metal mould which is evacuated via orifices in plugs (I) situated in the wall of the mould. The (I) form part of the interior wall of the mould and have sufficiently low thermal conductivity to ensure that the beads in contact with them do not fuse together by way of heat transfer through the (I) before the beads in the centre of the mould have fused together. Inlet plugs of similar design are situated in the wall of the mould for the introduction of hot gas (e.g. hot air to esp. steam) at 1-1.4 kgf./cm2. In use, hot gas enters the mould through the inlet plugs, passes through the beads and leaves together with air, gas and condensate via the evacuation plugs. Pref. the inlet and outlet plugs are made of nylon-6,6. Products are moulded expanded polystyrene bodies with even density and excellent structural properties. Articles with sudden changes in profile can be made. Due to the low conductivity of the plugs, the orifices do not become blocked by fusion of the beads by heat transfer from the walls of the mould.
FR6933051A 1968-09-26 1969-09-26 Moulding of expandable thermoplastic beads esp of - polystyrene Withdrawn FR2018976A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
GB28474/69A GB1261718A (en) 1968-09-26 1968-09-26 Method of moulding heat-expandable thermo-plastics material, and moulds therefor
GB4571768 1968-09-26
US00198766A US3809735A (en) 1968-09-26 1971-11-15 Method of moulding heat-expandable thermoplastic polymeric resinous granules involving enhanced distribution of the hot gaseous medium in the mold cavity

Publications (1)

Publication Number Publication Date
FR2018976A1 true FR2018976A1 (en) 1970-06-26

Family

ID=27258726

Family Applications (1)

Application Number Title Priority Date Filing Date
FR6933051A Withdrawn FR2018976A1 (en) 1968-09-26 1969-09-26 Moulding of expandable thermoplastic beads esp of - polystyrene

Country Status (5)

Country Link
DE (1) DE1948871B2 (en)
ES (1) ES371896A1 (en)
FR (1) FR2018976A1 (en)
NL (1) NL6914631A (en)
SE (1) SE357158B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7610516A (en) * 1975-09-30 1977-04-01 Sekisui Plastics STEAM DRAINING DEVICE.
DE19500601C2 (en) * 1995-01-11 1998-11-05 Notar Walter Method and device for producing molded parts from foamed plastic and their use

Also Published As

Publication number Publication date
SE357158B (en) 1973-06-18
NL6914631A (en) 1970-04-01
ES371896A1 (en) 1972-03-16
DE1948871A1 (en) 1970-04-02
DE1948871B2 (en) 1975-09-04

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Legal Events

Date Code Title Description
ST Notification of lapse