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GB1228753A - - Google Patents

Info

Publication number
GB1228753A
GB1228753A GB1228753DA GB1228753A GB 1228753 A GB1228753 A GB 1228753A GB 1228753D A GB1228753D A GB 1228753DA GB 1228753 A GB1228753 A GB 1228753A
Authority
GB
United Kingdom
Prior art keywords
platens
workpiece
platen
compression
work
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
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 filed Critical
Publication of GB1228753A publication Critical patent/GB1228753A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41D—APPARATUS FOR THE MECHANICAL REPRODUCTION OF PRINTING SURFACES FOR STEREOTYPE PRINTING; SHAPING ELASTIC OR DEFORMABLE MATERIAL TO FORM PRINTING SURFACES
    • B41D3/00—Casting stereotype plates; Machines, moulds, or devices therefor
    • B41D3/02—Horizontal moulds for casting flat plates

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

1,228,753. Compression moulding; hydraulic presses. SAMCO STRONG Ltd. 24 May, 1968 [24 May, 1967], No. 24030/67. Headings B5A and B5F. A press suitable for the production of duplicate printing plates from thermoplastic material, consists of a lower set of heated platens and an upper set of cooled platens, the workpiece first being precompressed to an oversized blank between the lower set of platens and then compressed to the desired final shape between the upper set of platens, during which compression the blank is cooled and set in its final shape. In the embodiment shown in the Figure the uppermost platen 64 of the upper set of platens is fixed, the middle platens 42 and 38 of each set are connected by heat-insulating plate 44 and are movable by means of cylinder 60, and the lowermost platen 28 of the lower set is movable by means of a ram 20. In operation, with the platens as shown in the Figure, the workpiece, sandwiched between a matrix and a carrier plate, is transferred from a work-table at level x-x on to platen 28 which is then raised, first against plate 38 under light pressure to heat the workpiece, and then under heavy pressure to close the press and precompress the workpiece. After the pre-compression the platens are allowed to fall under gravity and the dash-pot control of the cylinder 60 and ram 70 to their original positions whence the workpiece is transferred back to the work-table. The platens are then allowed to fall further until platen 42 reaches the level of the work-table, the workpiece then being transferred on to the platen and the platens re-raised to effect the final compression and cooling.
GB1228753D 1967-05-24 1967-05-24 Expired GB1228753A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2403067 1967-05-24

Publications (1)

Publication Number Publication Date
GB1228753A true GB1228753A (en) 1971-04-21

Family

ID=10205267

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1228753D Expired GB1228753A (en) 1967-05-24 1967-05-24

Country Status (1)

Country Link
GB (1) GB1228753A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2420421A1 (en) * 1978-03-20 1979-10-19 Canron Corp
GB2222799A (en) * 1988-09-02 1990-03-21 John Richard Dare Guiding a press ram within a press enclosing housing

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2420421A1 (en) * 1978-03-20 1979-10-19 Canron Corp
GB2222799A (en) * 1988-09-02 1990-03-21 John Richard Dare Guiding a press ram within a press enclosing housing

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Legal Events

Date Code Title Description
PS Patent sealed
PLNP Patent lapsed through nonpayment of renewal fees