GB901184A - Improvements in and relating to flexible diaphragms or facings - Google Patents

Improvements in and relating to flexible diaphragms or facings

Info

Publication number
GB901184A
GB901184A GB3491957A GB3491957A GB901184A GB 901184 A GB901184 A GB 901184A GB 3491957 A GB3491957 A GB 3491957A GB 3491957 A GB3491957 A GB 3491957A GB 901184 A GB901184 A GB 901184A
Authority
GB
United Kingdom
Prior art keywords
biscuit
diaphragm
pressure
sintering
boss
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
GB3491957A
Inventor
Patrick Breadwell Laming
Richard Hector Price
Alan Henderson
Alan Phillip Jones
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.)
Crane Process Flow Technologies Ltd
Original Assignee
Saunders Valve Co 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 to NL232972D priority Critical patent/NL232972A/xx
Priority to NL111823D priority patent/NL111823C/xx
Priority to BE572774D priority patent/BE572774A/xx
Application filed by Saunders Valve Co Ltd filed Critical Saunders Valve Co Ltd
Priority to GB3491957A priority patent/GB901184A/en
Priority to FR1214317D priority patent/FR1214317A/en
Priority to DE1958S0060526 priority patent/DE1234372B/en
Priority to CH6593558A priority patent/CH372835A/en
Publication of GB901184A publication Critical patent/GB901184A/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
    • B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B13/00—Conditioning or physical treatment of the material to be shaped
    • B29B13/007—Treatment of sinter powders
    • 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
    • B29C33/02—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means
    • B29C33/04—Moulds or cores; Details thereof or accessories therefor with incorporated heating or cooling means using liquids, gas or steam
    • 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
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • 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
    • B29C70/00—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts
    • B29C70/68—Shaping composites, i.e. plastics material comprising reinforcements, fillers or preformed parts, e.g. inserts by incorporating or moulding on preformed parts, e.g. inserts or layers, e.g. foam blocks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16J—PISTONS; CYLINDERS; SEALINGS
    • F16J3/00—Diaphragms; Bellows; Bellows pistons
    • F16J3/02—Diaphragms
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
    • F16K7/12—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with flat, dished, or bowl-shaped diaphragm
    • 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
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3613—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons applying pressure locally
    • 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
    • B29C43/36—Moulds for making articles of definite length, i.e. discrete articles
    • B29C43/361—Moulds for making articles of definite length, i.e. discrete articles with pressing members independently movable of the parts for opening or closing the mould, e.g. movable pistons
    • B29C2043/3615—Forming elements, e.g. mandrels or rams or stampers or pistons or plungers or punching devices
    • 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
    • B29C43/58—Measuring, controlling or regulating
    • B29C2043/5875—Measuring, controlling or regulating the material feed to the moulds or mould parts, e.g. controlling feed flow, velocity, weight, doses
    • B29C2043/5883—Measuring, controlling or regulating the material feed to the moulds or mould parts, e.g. controlling feed flow, velocity, weight, doses ensuring cavity filling, e.g. providing overflow 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
    • B29C2791/00—Shaping characteristics in general
    • B29C2791/001—Shaping 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • 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
    • B29C43/52—Heating or cooling
    • 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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/755—Membranes, diaphragms

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Composite Materials (AREA)
  • Diaphragms And Bellows (AREA)
  • Powder Metallurgy (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

901,184. Moulding flexible diaphragms. SAUNDERS VALVE CO. Ltd. Oct. 30, 1958 [Nov. 8, 1957], No. 34919/57. Class 87(2). A flexible diaphragm or diaphragm facing of polytetrafluoroethylene (p.t.f.e.), of the type used in diaphragm valves and having the head of a stud embedded in an integralboss is made by compacting uniformly distributed granules of p.t.f.e. by pressure between the lower and upper transition temperatures (20‹ and 327‹C. respectively) to form a biscuit, sintering the biscuit above 327‹C. but below the temperature at which decomposition sets in, hot coining the sintered biscuit below 327‹C., and finally quenching the hot coined moulding while it is still under pressure. The initial stage is performed with the apparatus of Fig. 3 comprising a mould 24, a main plunger 25, a second plunger 29 slidable in the cavity 28 in the main plunger, and shoulders 32, 33 for limiting the movement of the two plungers into the mould. The granular material 23 forming that part of the biscuit outside the boss is uniformly distributed by strickling, this and the subsequent compression preferably being carried out at only a little above 20‹C. Sintering should then be effected at, for example, 360‹C. for 90 min., with the biscuit supported in a cradle without being closely confined. Suitable conditions for the coining operation are a temperature of 318‹C. and a pressure of 1 ton/sq. in., using the press shown in Fig. 6. This includes upper and lower dies 41, 43 each with separate cooling jackets 45, 49. The upper die 41 has a separate central part 42 for the final shaping of the boss. It is during this stage that diametral and marginal ribs may be formed on the diaphragm which after being cooled rapidly, e.g. down to 150‹C. in 10 to 15 sec., is removed from the press. Specifications 644,008, 696,545 and 901,185 are referred to.
GB3491957A 1957-11-08 1957-11-08 Improvements in and relating to flexible diaphragms or facings Expired GB901184A (en)

Priority Applications (7)

Application Number Priority Date Filing Date Title
NL232972D NL232972A (en) 1957-11-08
NL111823D NL111823C (en) 1957-11-08
BE572774D BE572774A (en) 1957-11-08
GB3491957A GB901184A (en) 1957-11-08 1957-11-08 Improvements in and relating to flexible diaphragms or facings
FR1214317D FR1214317A (en) 1957-11-08 1958-11-03 Refinements to flexible valve diaphragms and their plating
DE1958S0060526 DE1234372B (en) 1957-11-08 1958-11-06 Method and device for the production of flexible membranes or membrane coatings from polytetrafluoroethylene
CH6593558A CH372835A (en) 1957-11-08 1958-11-07 Method and device for producing flexible membranes or membrane coverings from polytetrafluoroethylene

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3491957A GB901184A (en) 1957-11-08 1957-11-08 Improvements in and relating to flexible diaphragms or facings

Publications (1)

Publication Number Publication Date
GB901184A true GB901184A (en) 1962-07-18

Family

ID=10371551

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3491957A Expired GB901184A (en) 1957-11-08 1957-11-08 Improvements in and relating to flexible diaphragms or facings

Country Status (6)

Country Link
BE (1) BE572774A (en)
CH (1) CH372835A (en)
DE (1) DE1234372B (en)
FR (1) FR1214317A (en)
GB (1) GB901184A (en)
NL (2) NL111823C (en)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459092A (en) * 1980-11-29 1984-07-10 Yoshida Industry Co., Ltd. Apparatus for integrally molding an ornament plate on a plastic body
EP0721076A3 (en) * 1995-01-06 1996-07-24 Yamada T S Co Ltd
EP1058005A3 (en) * 1999-06-03 2001-10-17 Saint-Gobain Performance Plastics Corporation Fluoropolymer pump diaphragm with integral piston stud
DE10216661A1 (en) * 2002-04-15 2003-10-30 Gottlob Dietz Gmbh Composite membrane for membrane valve has cover layer as sintered compact vulcanized onto backing layer, with both layers centrally interconnected in flat region with diameter smaller than effective diameter of membrane
US7794642B2 (en) 2005-05-20 2010-09-14 Renolit Gor S.P.A. Process and mold for molding structured sheets
WO2016116154A1 (en) * 2015-01-21 2016-07-28 Toyota Motor Europe Nv/Sa Moulds and method for molding a plastic sheet
CN108372669A (en) * 2018-03-06 2018-08-07 南京道隆生物科技有限公司 A kind of sanitation-grade diaphragm and its manufacturing process
EP4279242A1 (en) * 2022-05-18 2023-11-22 Vanéflon nv Method for manufacturing a rod-shaped fluoropolymer product

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA989127A (en) * 1971-03-01 1976-05-18 Norbert L. Bradley Scrapless forming of plastic articles
DE102014222522A1 (en) * 2014-11-05 2016-05-12 GEMÜ Gebr. Müller Apparatebau GmbH & Co. KG Pressing device and method for operating the pressing device

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL60736C (en) * 1942-11-24
US2400099A (en) * 1943-10-25 1946-05-14 Du Pont Process for obtaining shaped articles

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4459092A (en) * 1980-11-29 1984-07-10 Yoshida Industry Co., Ltd. Apparatus for integrally molding an ornament plate on a plastic body
EP0721076A3 (en) * 1995-01-06 1996-07-24 Yamada T S Co Ltd
US5743169A (en) * 1995-01-06 1998-04-28 Yamada T.S. Co., Ltd. Diaphragm assembly and method of manufacturing same
US5758565A (en) * 1995-01-06 1998-06-02 Yamada T.S. Co., Ltd. Diaphragm assembly and method of manufacturing same
EP1058005A3 (en) * 1999-06-03 2001-10-17 Saint-Gobain Performance Plastics Corporation Fluoropolymer pump diaphragm with integral piston stud
DE10216661A1 (en) * 2002-04-15 2003-10-30 Gottlob Dietz Gmbh Composite membrane for membrane valve has cover layer as sintered compact vulcanized onto backing layer, with both layers centrally interconnected in flat region with diameter smaller than effective diameter of membrane
US7794642B2 (en) 2005-05-20 2010-09-14 Renolit Gor S.P.A. Process and mold for molding structured sheets
WO2016116154A1 (en) * 2015-01-21 2016-07-28 Toyota Motor Europe Nv/Sa Moulds and method for molding a plastic sheet
CN108372669A (en) * 2018-03-06 2018-08-07 南京道隆生物科技有限公司 A kind of sanitation-grade diaphragm and its manufacturing process
EP4279242A1 (en) * 2022-05-18 2023-11-22 Vanéflon nv Method for manufacturing a rod-shaped fluoropolymer product
BE1030544B1 (en) * 2022-05-18 2023-12-18 Vaneflon Nv METHOD FOR MANUFACTURING A ROD-SHAPED FLUOROPOLIMER PRODUCT

Also Published As

Publication number Publication date
CH372835A (en) 1963-10-31
NL111823C (en)
NL232972A (en)
FR1214317A (en) 1960-04-07
DE1234372B (en) 1967-02-16
BE572774A (en)

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