GB2204266A - Fibre-reinforced elastomeric sheet material - Google Patents

Fibre-reinforced elastomeric sheet material Download PDF

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Publication number
GB2204266A
GB2204266A GB08710390A GB8710390A GB2204266A GB 2204266 A GB2204266 A GB 2204266A GB 08710390 A GB08710390 A GB 08710390A GB 8710390 A GB8710390 A GB 8710390A GB 2204266 A GB2204266 A GB 2204266A
Authority
GB
United Kingdom
Prior art keywords
fibre
dough
sheet
reinforced
elastomeric sheet
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.)
Granted
Application number
GB08710390A
Other versions
GB8710390D0 (en
GB2204266B (en
Inventor
John Robert Hoyes
Michael Eugene Grabowski
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.)
TBA Industrial Products Ltd
Original Assignee
TBA Industrial Products 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 TBA Industrial Products Ltd filed Critical TBA Industrial Products Ltd
Priority to GB8710390A priority Critical patent/GB2204266B/en
Publication of GB8710390D0 publication Critical patent/GB8710390D0/en
Publication of GB2204266A publication Critical patent/GB2204266A/en
Application granted granted Critical
Publication of GB2204266B publication Critical patent/GB2204266B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L1/00—Compositions of cellulose, modified cellulose or cellulose derivatives
    • C08L1/02—Cellulose; Modified cellulose
    • 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
    • B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/24—Calendering
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/04—Reinforcing macromolecular compounds with loose or coherent fibrous material
    • C08J5/045—Reinforcing macromolecular compounds with loose or coherent fibrous material with vegetable or animal fibrous material
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L21/00—Compositions of unspecified rubbers
    • 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
    • B29K2021/00—Use of unspecified rubbers as moulding material
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/12—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts of short lengths, e.g. chopped filaments, staple fibres or bristles
    • 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
    • B29K2105/06—Condition, form or state of moulded material or of the material to be shaped containing reinforcements, fillers or inserts
    • B29K2105/16—Fillers
    • 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
    • B29K2711/00—Use of natural products or their composites, not provided for in groups B29K2601/00 - B29K2709/00, for preformed parts, e.g. for inserts
    • B29K2711/14—Wood, e.g. woodboard or fibreboard
    • 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
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/008—Wide strips, e.g. films, webs
    • 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
    • B29L2031/26—Sealing devices, e.g. packaging for pistons or pipe joints
    • B29L2031/265—Packings, Gaskets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J2321/00—Characterised by the use of unspecified rubbers
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • C08L2205/16—Fibres; Fibrils
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L7/00—Compositions of natural rubber
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
    • C08L9/02—Copolymers with acrylonitrile

Landscapes

  • Chemical & Material Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Reinforced Plastic Materials (AREA)

Abstract

In a process for the manufacture of a fibre-reinforced elastomeric sheet by preparing a dough from uncured elastomer, solvent, non-asbestos reinforcing fibres, filler and curing agent, and progressively forming the dough on the surface of a heated cylinder into a sheet comprising fibre-reinforced cured elastomer, the reinforcing fibres employed are of cellulose in the form of wood pulp which has been hammer milled before preparation of the dough.

Description

Fibre-reinforced elastomeric sheet materials This invention relates to the production of fibre-reinforced elastomeric sheet materials especially, but not exclusively, for use in the manufacture of gaskets.
Such sheet materials have been known since the turn of the century, and a very widely used formulation utilises asbestos fibres as reinforcement. Recently, asbestos has been replaced by glass fibres. Glass fibres are physically and chemically very different from asbestos and it has accordingly been necessary to develop new formulations in order to arrive at a satisfactory product using traditional processing equipment and methods.
The best known method of manufacture is the "it" calendering process, which was invented before 1900. In this process an elastomer dough comprising fibres, elastomer, solvent, filler and curing agent is progressively formed into a sheet on the surface of a heated cylinder. The sheet is built up gradually as a series of very thin layers, to allow the solvent to evaporate from the dough during curing. When a desired thickness has been achieved, the cured sheet is cut across and removed from the cylinder, for processing into gaskets or other products.
The foregoing process has been used to make asbestos - and also glass-fibre reinforced elastomer bonded sheets.
However, cellulose-fibre - reinforced elastomer bonded sheets are also very well-known, and are made by papermaking processes from aqueous slurries incorporating rubber latices. Hitherto such sheets have had limited utility owing to their generally inferior strength.
Cellulose fibres have not been made use of in the tradditional "it" calendering process because of their low strength when compared with asbestos or glass fibres.
We have now found that cellulose fibres in the form of hammer-milled wood pulp can very suitably be employed as non-asbestos reinforcement in an "it" calendering process.
The extent to which wood pulp is disintegrated by hammer milling can be assessed by using a tamping volumeter, described in British Standard 3483 Part B10:1982 (ISO 787/11-1981E). A 5g fibre sample is taken in conjunction with a 194g plug placed on top of the sample to assist tamping. With a 2,500 cycle test duration, suitable fibres give a final volume of 85 cm3 or more, the volume being usually in the range 85- 95 cm3.
The invention is further illustrated by the following example.
Example An elastomer dough was made by compounding in conventional apparatus a mix comprising by weight: Natural rubber 10.7 Nitrile rubber 3.3 Hammer-milled cellulose fibres 13.4 Limestone 48.6 Barytes 24.0 together with a conventional sulphur curing system and solvent (toluene; 50% by weight) with a little water as processing aid.
The dough was then "it" calendered into a sheet, which on test exhibited the following satisfactory properties: ThIckness 1.0 mm 3 Density 1.8 kg/m ASTM Compression 9.0% ASTM Recovery 53.3% ASTM Tensile Strengths -2 (with grain) 18.4 MNm -2 (across grain) 8.1 MNm

Claims (4)

  1. CLAIMS 1. A process for the manufacture of a fibre-reinforced elastomeric sheet by preparing a dough from uncured elastomer, solvent, non-asbestos reinforcing fibres, filler and curing agent, and progressively forming the dough on the surface of a heated cylinder into a sheet comprising fibre-reinforced cured elastomer, in which process the reinforcing fibres are of cellulose in the form of wood pulp which has been hammer - milled before preparation of the dough.
  2. 2. A process according to Claim 1 wherein the hammer 3 milled cellulose has a volume of at least 85 cm when tested as described herein.
  3. 3. A process according to Claim 1 substantially as described with reference to the example.
  4. 4. Sheet material made by the process of any preceding claim.
GB8710390A 1987-05-01 1987-05-01 Fibre-reinforced elastomeric sheet materials Expired - Fee Related GB2204266B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB8710390A GB2204266B (en) 1987-05-01 1987-05-01 Fibre-reinforced elastomeric sheet materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB8710390A GB2204266B (en) 1987-05-01 1987-05-01 Fibre-reinforced elastomeric sheet materials

Publications (3)

Publication Number Publication Date
GB8710390D0 GB8710390D0 (en) 1987-06-03
GB2204266A true GB2204266A (en) 1988-11-09
GB2204266B GB2204266B (en) 1990-03-07

Family

ID=10616708

Family Applications (1)

Application Number Title Priority Date Filing Date
GB8710390A Expired - Fee Related GB2204266B (en) 1987-05-01 1987-05-01 Fibre-reinforced elastomeric sheet materials

Country Status (1)

Country Link
GB (1) GB2204266B (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2246309A (en) * 1990-07-26 1992-01-29 Tba Industrial Products Ltd Composite sheet
EP0578036A1 (en) * 1992-07-07 1994-01-12 Paul Troester Maschinenfabrik Calender and method for producing sealing sheets
US8876118B2 (en) 2000-01-14 2014-11-04 Flexitallic Investments Inc. Gaskets
US10920119B2 (en) 2005-01-11 2021-02-16 Flexitallic Investments Incorporated Gasket material and its process of production

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2246309A (en) * 1990-07-26 1992-01-29 Tba Industrial Products Ltd Composite sheet
GB2246309B (en) * 1990-07-26 1994-05-25 Tba Industrial Products Ltd Composite sheet
EP0578036A1 (en) * 1992-07-07 1994-01-12 Paul Troester Maschinenfabrik Calender and method for producing sealing sheets
US8876118B2 (en) 2000-01-14 2014-11-04 Flexitallic Investments Inc. Gaskets
US10920119B2 (en) 2005-01-11 2021-02-16 Flexitallic Investments Incorporated Gasket material and its process of production

Also Published As

Publication number Publication date
GB8710390D0 (en) 1987-06-03
GB2204266B (en) 1990-03-07

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Legal Events

Date Code Title Description
732E Amendments to the register in respect of changes of name or changes affecting rights (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20050501