GB810852A - Improved process for the production of shaped articles - Google Patents

Improved process for the production of shaped articles

Info

Publication number
GB810852A
GB810852A GB2495356A GB2495356A GB810852A GB 810852 A GB810852 A GB 810852A GB 2495356 A GB2495356 A GB 2495356A GB 2495356 A GB2495356 A GB 2495356A GB 810852 A GB810852 A GB 810852A
Authority
GB
United Kingdom
Prior art keywords
mould
per square
pounds per
square inch
temperature
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
GB2495356A
Inventor
Peter Inoledon Vincent
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.)
Imperial Chemical Industries Ltd
Original Assignee
Imperial Chemical Industries 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
Application filed by Imperial Chemical Industries Ltd filed Critical Imperial Chemical Industries Ltd
Priority to GB2495356A priority Critical patent/GB810852A/en
Publication of GB810852A publication Critical patent/GB810852A/en
Expired 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
    • B29C43/006—Pressing and sintering powders, granules or fibres
    • 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
    • B29C43/14—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of definite length, i.e. discrete articles in several steps
    • 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
    • B29C67/00—Shaping techniques not covered by groups B29C39/00 - B29C65/00, B29C70/00 or B29C73/00
    • B29C67/02—Moulding by agglomerating
    • B29C67/04—Sintering
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2027/00—Use of polyvinylhalogenides or derivatives thereof as moulding material
    • B29K2027/12—Use of polyvinylhalogenides or derivatives thereof as moulding material containing fluorine
    • B29K2027/18—PTFE, i.e. polytetrafluorethene, e.g. ePTFE, i.e. expanded polytetrafluorethene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25—Solid
    • B29K2105/251—Particles, powder or granules

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

Polytetrafluoroethylene is moulded by first pressing particles of the material in a mould at a temperature of from 30 DEG C. to 190 DEG C. and preferably 60 DEG C. to 100 DEG C. and at a pressure of 50 to 10,000 pounds per square inch and preferably 3,000 to 7,000 pounds per square inch, removing the pressed material from the mould, sintering it at a temperature between 327 DEG C. and 500 DEG C. and preferably 360 DEG C. to 400 DEG C., e.g. 380 DEG C., and cooling the pressed body by immersion in cold water or by placing between cold metal plates. To compensate for shrinkage during sintering, extra material is placed in the mould. To allow air to escape, a pause is made during the build up of pressure. Details of the mechanical properties of moulded articles are described. According to the Provisional Specification inert fillers, e.g. finely divided metals, graphite, asbestos, and silica, may be added.
GB2495356A 1956-08-15 1956-08-15 Improved process for the production of shaped articles Expired GB810852A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2495356A GB810852A (en) 1956-08-15 1956-08-15 Improved process for the production of shaped articles

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2495356A GB810852A (en) 1956-08-15 1956-08-15 Improved process for the production of shaped articles

Publications (1)

Publication Number Publication Date
GB810852A true GB810852A (en) 1959-03-25

Family

ID=10219895

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2495356A Expired GB810852A (en) 1956-08-15 1956-08-15 Improved process for the production of shaped articles

Country Status (1)

Country Link
GB (1) GB810852A (en)

Similar Documents

Publication Publication Date Title
GB596214A (en) Improvements in production of oxygen-free copper
GB934421A (en) Improvements in or relating to optical elements and method for making such elements
US2824345A (en) Apparatus and method for curing a formed granular article
ES453103A1 (en) Process for moulding cellular polycarbodiimide
GB810852A (en) Improved process for the production of shaped articles
GB717555A (en) Improvements in or relating to shaped silicon nitride bodies and their manufacture
US2771648A (en) Curing shell molds in fluidized beds
US3214254A (en) Precision glass molding process and apparatus
NO900210D0 (en) PROCEDURE FOR THE MANUFACTURE OF LATEX FOAM MATERIAL.
GB1082107A (en) Process for the production of flat or curved sheets of glass
JPS5678944A (en) Method and apparatus for heating opening portion of neck mold
JPS571539A (en) Casting method and mold
CN215615024U (en) Full-automatic reverse rotation type vacuum pressurization die reversing machine
GB965710A (en) Process for the production of beryllium having increased ductility at high temperatures
GB1011779A (en) Improvements in or relating the manufacture of optical elements
GB977606A (en) Improvements in the manufacture of molded polyurethane foam products
GB1024971A (en) Process for the production of formed bodies from carbonaceous material
GB781100A (en) Improvements in or relating to the production of beryllium
FR2281185A1 (en) Wax removal from mould of lost wax casting machine - by irradiation after introduction of matl. with high loss factor
JPS5758952A (en) Mold made of expanded graphite
JPS6414118A (en) Metallic die structure for forming precise glass product
GB633117A (en) Improvements in processes and apparatus for the treatment of hafnium, zirconium, titanium, thorium and their alloys in the molten state
GB902169A (en) Process and apparatus for the continuous production of a completely melted or partially melted and expanded product
GB190224616A (en) An Improved Process for Manufacturing Hollow Glass Articles.
JPS54110109A (en) Molding method by hydrostatic pressure to produce compressed powdered-material