GB629668A - Improvements relating to cellular thermoplastic materials - Google Patents

Improvements relating to cellular thermoplastic materials

Info

Publication number
GB629668A
GB629668A GB35719/46A GB3571946A GB629668A GB 629668 A GB629668 A GB 629668A GB 35719/46 A GB35719/46 A GB 35719/46A GB 3571946 A GB3571946 A GB 3571946A GB 629668 A GB629668 A GB 629668A
Authority
GB
United Kingdom
Prior art keywords
polythene
blowing agent
heating
mix
conductor
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
GB35719/46A
Other languages
English (en)
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.)
HAROLD FREDERIC WILSON
Telegraph Construction and Maintenance Co Ltd
Original Assignee
HAROLD FREDERIC WILSON
Telegraph Construction and Maintenance 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 FR957687D priority Critical patent/FR957687A/fr
Priority to NL67205D priority patent/NL67205C/xx
Application filed by HAROLD FREDERIC WILSON, Telegraph Construction and Maintenance Co Ltd filed Critical HAROLD FREDERIC WILSON
Priority to GB35719/46A priority patent/GB629668A/en
Publication of GB629668A publication Critical patent/GB629668A/en
Expired legal-status Critical Current

Links

Classifications

    • 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
    • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
    • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
    • C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
    • B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
    • B29C44/322—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed parts being elongated inserts, e.g. cables
    • 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
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/34—Auxiliary operations
    • B29C44/36—Feeding the material to be shaped
    • B29C44/46—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length
    • B29C44/50—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying
    • B29C44/505—Feeding the material to be shaped into an open space or onto moving surfaces, i.e. to make articles of indefinite length using pressure difference, e.g. by extrusion or by spraying extruding the compound through a flat die
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0012—Combinations of extrusion moulding with other shaping operations combined with shaping by internal pressure generated in the material, e.g. foaming
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/06—Rod-shaped
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/304—Extrusion nozzles or dies specially adapted for bringing together components, e.g. melts within the die
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/30—Extrusion nozzles or dies
    • B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular articles
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/78—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling
    • B29C48/80—Thermal treatment of the extrusion moulding material or of preformed parts or layers, e.g. by heating or cooling at the plasticising zone, e.g. by heating cylinders
    • B29C48/83—Heating or cooling the cylinders
    • B29C48/832—Heating
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
    • B29C48/91—Heating, e.g. for cross linking
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
    • H01B13/06—Insulating conductors or cables
    • H01B13/14—Insulating conductors or cables by extrusion
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H01B3/44—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins
    • H01B3/441—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes vinyl resins; acrylic resins from alkenes
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/05—Filamentary, e.g. strands
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/04—Polymers of ethylene
    • B29K2023/06—PE, i.e. polyethylene
    • 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
    • B29K2105/20—Inserts
    • 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
    • B29K2705/00—Use of metals, their alloys or their compounds, for preformed parts, e.g. for inserts
    • 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
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3462—Cables
    • 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
    • C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
    • C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
    • C08J2323/04—Homopolymers or copolymers of ethene
    • C08J2323/06—Polyethene

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Manufacturing & Machinery (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Materials Engineering (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
GB35719/46A 1946-12-02 1946-12-02 Improvements relating to cellular thermoplastic materials Expired GB629668A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
FR957687D FR957687A (US07122603-20061017-C00045.png) 1946-12-02
NL67205D NL67205C (US07122603-20061017-C00045.png) 1946-12-02
GB35719/46A GB629668A (en) 1946-12-02 1946-12-02 Improvements relating to cellular thermoplastic materials

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB35719/46A GB629668A (en) 1946-12-02 1946-12-02 Improvements relating to cellular thermoplastic materials

Publications (1)

Publication Number Publication Date
GB629668A true GB629668A (en) 1949-09-26

Family

ID=10380831

Family Applications (1)

Application Number Title Priority Date Filing Date
GB35719/46A Expired GB629668A (en) 1946-12-02 1946-12-02 Improvements relating to cellular thermoplastic materials

Country Status (3)

Country Link
FR (1) FR957687A (US07122603-20061017-C00045.png)
GB (1) GB629668A (US07122603-20061017-C00045.png)
NL (1) NL67205C (US07122603-20061017-C00045.png)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1006918B (de) * 1955-04-19 1957-04-25 Basf Ag Verfahren zur Herstellung mit schaumfoermigen Kunststoffen isolierter elektrischer Leiter
US2835927A (en) * 1953-05-07 1958-05-27 Western Electric Co Methods of producing cellular plastics
US2885737A (en) * 1954-05-24 1959-05-12 Anaconda Wire & Cable Co Manufacture of high frequency cable
US2945828A (en) * 1957-02-20 1960-07-19 Western Electric Co Composite materials for producing cellular polyethylene articles
US3068532A (en) * 1958-12-09 1962-12-18 Union Carbide Corp Method of preparing insulated electrical conductors
US3162703A (en) * 1960-12-06 1964-12-22 Foster Grant Co Inc Injection molding of foam materials
US3300554A (en) * 1963-09-27 1967-01-24 Western Electric Co Method of making cellular articles
US3342913A (en) * 1963-11-29 1967-09-19 Phillips Petroleum Co Process and apparatus for the production of mouldings or extrusions having a cellular structure from thermoplastic synthetic materials
DE2545931A1 (de) * 1975-10-14 1977-04-21 Felten & Guilleaume Carlswerk Verfahren zum herstellen isolierter draehte und leitungen mit hohem schaeumungsgrad des isolierstoffes
EP0748675A2 (en) * 1995-06-14 1996-12-18 Dow Corning Corporation Continuous foam profile containing a filamentary core and method for preparing same
CN107234792A (zh) * 2017-07-28 2017-10-10 邓哲琪 节能环保型同向挤出包覆机

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1214868B (de) * 1951-06-11 1966-04-21 Polymer Corp Verfahren und Vorrichtung zum Herstellen blasenfreier Stangen, insbesondere aus einem hochschmelzenden Polyamid
NL82159C (US07122603-20061017-C00045.png) * 1952-04-17
DE1175423B (de) * 1954-11-18 1964-08-06 Collo Rheincollodium Koeln G M Verfahren und Vorrichtung zum kontinuierlichen Umhuellen langgestreckter Gegenstaende mit Schaumstoffen
DE1158699B (de) * 1955-03-02 1963-12-05 Basf Ag Verfahren zur Herstellung von kleinteiligen blaehfaehigen thermoplastischen Kunststoffen
DE1196852B (de) * 1959-05-16 1965-07-15 Siemens Ag Vorrichtung zur Herstellung einer Schaumstoff-isolierung von elektrischen Leitern im Strang-pressverfahren

Cited By (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2835927A (en) * 1953-05-07 1958-05-27 Western Electric Co Methods of producing cellular plastics
US2885737A (en) * 1954-05-24 1959-05-12 Anaconda Wire & Cable Co Manufacture of high frequency cable
DE1006918B (de) * 1955-04-19 1957-04-25 Basf Ag Verfahren zur Herstellung mit schaumfoermigen Kunststoffen isolierter elektrischer Leiter
US2945828A (en) * 1957-02-20 1960-07-19 Western Electric Co Composite materials for producing cellular polyethylene articles
US3068532A (en) * 1958-12-09 1962-12-18 Union Carbide Corp Method of preparing insulated electrical conductors
US3162703A (en) * 1960-12-06 1964-12-22 Foster Grant Co Inc Injection molding of foam materials
US3300554A (en) * 1963-09-27 1967-01-24 Western Electric Co Method of making cellular articles
US3342913A (en) * 1963-11-29 1967-09-19 Phillips Petroleum Co Process and apparatus for the production of mouldings or extrusions having a cellular structure from thermoplastic synthetic materials
DE2545931A1 (de) * 1975-10-14 1977-04-21 Felten & Guilleaume Carlswerk Verfahren zum herstellen isolierter draehte und leitungen mit hohem schaeumungsgrad des isolierstoffes
EP0748675A2 (en) * 1995-06-14 1996-12-18 Dow Corning Corporation Continuous foam profile containing a filamentary core and method for preparing same
EP0748675A3 (en) * 1995-06-14 1997-05-02 Dow Corning Continuous profiled foam plastic with fibrous core and method of manufacture
CN107234792A (zh) * 2017-07-28 2017-10-10 邓哲琪 节能环保型同向挤出包覆机

Also Published As

Publication number Publication date
NL67205C (US07122603-20061017-C00045.png) 1900-01-01
FR957687A (US07122603-20061017-C00045.png) 1950-02-23

Similar Documents

Publication Publication Date Title
GB629668A (en) Improvements relating to cellular thermoplastic materials
ES181634A1 (es) Un aparato para la aplicaciones de materiales insecticidas y similares
GB616996A (en) Improvements in or relating to high frequency dielectric heating
GB713634A (en) Improvements relating to the manufacture of polythene-metal foil laminates
ES214633A1 (es) Un procedimiento para vulcanizar caucho en hojas
GB632980A (en) Methods of treating germanium material
GB577719A (en) Improvements relating to apparatus for heating insulating material by subjecting it to a high frequency field of electric force
GB688761A (en) Improvements in or relating to methods of generating gases within plastic materials
GB619421A (en) Improvements relating to the embossing of thermoplastic materials
GB645115A (en) Improvements in gas expanded material and method of making same
FR2077851A1 (en) Cellular pvc mouldings - obtd by two stage crosslinking and blowing processes
CH609074A5 (en) Process for the manufacture of polyethylene foam
GB597119A (en) Manufacture of 3-tetrahydrofuranone
GB628612A (en) Improvements relating to the radio frequency heating of dielectrics
CA442396A (en) Power producing process and apparatus
CA435942A (en) Thermoplastic sheet shaping method and apparatus
AU875346A (en) Method and apparatus tor continuously vulcanizing strip material
CA447541A (en) Means for supplying, heating, mechanically forcing or extruding and delivering plastics to calenders, etc.
CA450666A (en) Stretching and clamping tool for tire tubes
CA445400A (en) Heating and cooling apparatus
CA437905A (en) Extrusion method and apparatus
GB652696A (en) Light and stable thermoplastic base products made up of closed polyhedral cells, and a method of manufacturing the same
CA437827A (en) Leather glazing process and apparatus
AU126331B2 (en) Apparatus and continuous process for pressing plastic sheeting
CA446283A (en) Perforating with heated tool