GB1425612A - Moulding of plastics foam - Google Patents

Moulding of plastics foam

Info

Publication number
GB1425612A
GB1425612A GB2543073A GB2543073A GB1425612A GB 1425612 A GB1425612 A GB 1425612A GB 2543073 A GB2543073 A GB 2543073A GB 2543073 A GB2543073 A GB 2543073A GB 1425612 A GB1425612 A GB 1425612A
Authority
GB
Grant status
Application
Patent type
Prior art keywords
foam
motor
support
side walls
movement
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.)
Expired
Application number
GB2543073A
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.)
Dunlop Ltd
Original Assignee
Dunlop 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

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34Auxiliary operations
    • B29C44/58Moulds
    • B29C44/586Moulds with a cavity increasing in size during foaming
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C33/00Moulds or cores; Details thereof or accessories therefor

Abstract

1425612 Moulding foam blocks DUNLOP Ltd 23 May 1974 [29 May 1973] 25430/73 Heading B5A A process for the batch production of blocks of plastics foam, e.g. of polyurethane, in which the blocks produced have a flat upper surface, comprises depositing a foamable reaction mixture on to a support 10 which together with side walls 23 defines a mould cavity, and when the reaction mixture begins to foam lowering the support to effect relative movement between the support and the side walls so as to increase the volume of the cavity at such a speed that the zone of contact between the upper surface of the foam and the side walls does not move, the relative movement being stopped when the foam ceases to increase in depth. Fig. 1 shows apparatus suitable for performing the method, the support 10 being movable by a scissors type lowering device 10a operated by a motor 20. The side walls 23 of the mould are hinged to enable them to be swung outwardly for access to the moulded block. Fig. 3 illustrates a control arrangement for the lowering operation in which a control plate 25 resting on the surface of the foam 36 is connected via a linear variable differential transformer 26, microswitch 28 and thyristor controller 27 to the motor 20. Upward movement of the plate 25 triggers the microswitch 28 and starts the motor 20 and thus downward movement of the tray 10, this being continued until the control plate 25 returns to its equilibrium position. The speed at which the motor 20 runs is governed by the movement of the plate 25, detected by the LVDT 26 which feeds appropriate speed instructions to the thyristor controller 27. Instead of the control plate 25 a photo-electric cell could be used to detect movement of the upper surface of the foam. As an alternative to the control mechanism illustrated, the rise of foam may be judged visually and the tray 10 lowered manually, e.g. by a winding device.
GB2543073A 1973-05-29 1973-05-29 Moulding of plastics foam Expired GB1425612A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2543073A GB1425612A (en) 1973-05-29 1973-05-29 Moulding of plastics foam

Applications Claiming Priority (11)

Application Number Priority Date Filing Date Title
GB2543073A GB1425612A (en) 1973-05-29 1973-05-29 Moulding of plastics foam
NL7406809A NL7406809A (en) 1973-05-29 1974-05-21
CA 200521 CA1021118A (en) 1973-05-29 1974-05-22 Thickness adjustment for shaping plastic foam blocks
FI162074A FI162074A (en) 1973-05-29 1974-05-27
DK288874A DK288874A (en) 1973-05-29 1974-05-28
ES426706A ES426706A1 (en) 1973-05-29 1974-05-28 A method of molding a plastic foam block with substantially flat upper unasuperficie.
DE19742426212 DE2426212A1 (en) 1973-05-29 1974-05-29 A process for the manufacture of blocks of foamed plastic and apparatus for performing the method
JP6067074A JPS5022064A (en) 1973-05-29 1974-05-29
FR7418609A FR2231503B1 (en) 1973-05-29 1974-05-29
BE144898A BE815707A (en) 1973-05-29 1974-05-29 Improvements in plastic materials EXPANDED
US05592994 US4088722A (en) 1973-05-29 1975-07-03 Method for molding a block of polyurethane foam having a flat upper surface

Publications (1)

Publication Number Publication Date
GB1425612A true true GB1425612A (en) 1976-02-18

Family

ID=10227546

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2543073A Expired GB1425612A (en) 1973-05-29 1973-05-29 Moulding of plastics foam

Country Status (10)

Country Link
JP (1) JPS5022064A (en)
BE (1) BE815707A (en)
CA (1) CA1021118A (en)
DE (1) DE2426212A1 (en)
DK (1) DK288874A (en)
ES (1) ES426706A1 (en)
FI (1) FI162074A (en)
FR (1) FR2231503B1 (en)
GB (1) GB1425612A (en)
NL (1) NL7406809A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2291002A (en) * 1994-07-08 1996-01-17 Hoover Universal Apparatus and method for producing blocks of foam

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4666393A (en) * 1986-06-13 1987-05-19 Human Industry Corporation Apparatus for manufacturing polyurethane foam slabs in a batch

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2588151A (en) * 1948-09-30 1952-03-04 Gen Electric Apparatus for producing uniform foam structures
US2649620A (en) * 1951-08-01 1953-08-25 Union Carbide & Carbon Corp Casting expanded plastics

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2291002A (en) * 1994-07-08 1996-01-17 Hoover Universal Apparatus and method for producing blocks of foam

Also Published As

Publication number Publication date Type
BE815707A (en) 1974-09-16 grant
ES426706A1 (en) 1977-01-01 application
DE2426212A1 (en) 1974-12-19 application
DK288874A (en) 1975-01-20 application
FR2231503B1 (en) 1976-12-24 grant
CA1021118A1 (en) grant
JPS5022064A (en) 1975-03-08 application
BE815707A1 (en) grant
FI162074A (en) 1974-11-30 application
FR2231503A1 (en) 1974-12-27 application
CA1021118A (en) 1977-11-22 grant
NL7406809A (en) 1974-12-03 application

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Legal Events

Date Code Title Description
PS Patent sealed
PCNP Patent ceased through non-payment of renewal fee