GB1328362A - Dispersion of materials in thermoplastics - Google Patents
Dispersion of materials in thermoplasticsInfo
- Publication number
- GB1328362A GB1328362A GB1328362DA GB1328362A GB 1328362 A GB1328362 A GB 1328362A GB 1328362D A GB1328362D A GB 1328362DA GB 1328362 A GB1328362 A GB 1328362A
- Authority
- GB
- United Kingdom
- Prior art keywords
- section
- screw
- blowing agent
- polymer
- thermoplastic
- 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
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
- C08J9/12—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 physical blowing agent
- C08J9/14—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 physical blowing agent organic
-
- 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
- B29C44/3442—Mixing, kneading or conveying the foamable material
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
1328362 Extruding foam plastics IMPERIAL CHEMICAL INDUSTRIES Ltd 4 Oct 1971 [19 Oct 1970] 49447/70 Heading B5A [Also in Division C3] A foamed thermoplastic polymer is formed in an apparatus comprising a screw extruder provided with two inlet ports, downstream of the melting zone, through which a liquid and a gaseous blowing agent respectively may be injected, the inlet port for the gaseous blowing agent being connected to a constant pressure supply of gaseous blowing agent via a flow restricting device across which a pressure drop of at least 100 p.s.i. can be maintained while the inlet port for the liquid blowing agent is connected to a metering device delivering a given quantity of liquid blowing agent per unit time. The flow restricting device may be a length of capillary tube. The extruder screw may have a section, rotating with the screw and opposite at least the injection port for the liquid blowing agent, wherein the molten thermoplastic is divided into a plurality of streams. This division may be achieved by providing a fluted section in the screw comprising a cylinder having several (at least 3) axial channels formed on its outer surface. It is preferred that the cylinder has a length at least equal to the internal diameter of the extruder barrel, e.g. 3-6 times the diameter. The fluted section may be followed by a turbine section which both shears and further subdivides the mixture. The turbine mixing section preferably comprises a plurality of toothed rotors mounted on the screw to rotate therewith, the teeth of alternate rotors being staggered. After this section there is preferably a further mixing section in which a cylindrical member provided with inlet grooves not extending along the whole length of the member is used. In Fig. 1 a screw rotates in a barrel 1 and the thermoplastic polymer is compressed and melted in a compression section 3 of the screw. The polymer then passes to section 4 of the screw which is fluted having a series of axial grooves (Fig. 2) (not shown) which divides it into a plurality of streams. The first blowing agent is fed in at port 6 and the second injected via a capillary tube 9 at 8. The polymer then passes to turbine mixing section 10 containing a series of spaced toothed rotors (Fig. 3) (not shown) 11, 12, 13, 14 mounted on the screw so that they rotate therewith. The polymer is finally passed through a shearing section 18 consisting of a cylinder 19 provided with axial grooves 20 (Fig. 4) (not shown). The process for forming the foamed polymer is described (see Division C3), the first blowing agent comprising 20-75% by weight of the thermoplastic and the second up to 10% by weight of the thermoplastic. The polymer may be polyethylene.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB4944772A GB1317162A (en) | 1969-07-30 | 1970-10-19 | Material tester and search unit therefor |
Publications (1)
Publication Number | Publication Date |
---|---|
GB1328362A true GB1328362A (en) | 1973-08-30 |
Family
ID=10452374
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB1328362D Expired GB1328362A (en) | 1970-10-19 | 1970-10-19 | Dispersion of materials in thermoplastics |
Country Status (7)
Country | Link |
---|---|
JP (1) | JPS5513894B1 (en) |
BE (1) | BE774164A (en) |
CA (1) | CA963215A (en) |
ES (1) | ES396145A1 (en) |
FR (1) | FR2111694B1 (en) |
GB (1) | GB1328362A (en) |
NL (1) | NL7114343A (en) |
Families Citing this family (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA1092311A (en) * | 1975-09-04 | 1980-12-30 | John C. Miller | Extrusion of cellular thermoplastic material |
FI771008A (en) * | 1976-05-10 | 1977-11-11 | Berstorff Gmbh Masch Hermann | |
JPS5781680U (en) * | 1980-11-05 | 1982-05-20 | ||
DE59010789D1 (en) * | 1989-04-24 | 1998-02-12 | Hans Wilhelm Huetzen | Process for producing a halogen-free polyurethane insulating foam |
TR26440A (en) * | 1989-10-09 | 1995-03-15 | Hans Wilhelm Huetzen | HALOGEN HYDRO CARBONS THAT DO NOT CONTAIN POLYURETHANE FOAM MATERIAL AND A PROCESS FOR THE PRODUCTION OF IT |
-
1970
- 1970-10-19 GB GB1328362D patent/GB1328362A/en not_active Expired
-
1971
- 1971-10-12 CA CA124,956A patent/CA963215A/en not_active Expired
- 1971-10-18 FR FR7137296A patent/FR2111694B1/fr not_active Expired
- 1971-10-19 JP JP8219071A patent/JPS5513894B1/ja active Pending
- 1971-10-19 NL NL7114343A patent/NL7114343A/xx not_active Application Discontinuation
- 1971-10-19 BE BE774164A patent/BE774164A/en unknown
- 1971-10-19 ES ES396145A patent/ES396145A1/en not_active Expired
Also Published As
Publication number | Publication date |
---|---|
NL7114343A (en) | 1972-04-21 |
FR2111694B1 (en) | 1975-07-18 |
AU3475771A (en) | 1973-05-03 |
ES396145A1 (en) | 1975-02-16 |
CA963215A (en) | 1975-02-25 |
BE774164A (en) | 1972-04-19 |
JPS5513894B1 (en) | 1980-04-12 |
FR2111694A1 (en) | 1972-06-09 |
DE2152018B2 (en) | 1975-11-06 |
DE2152018A1 (en) | 1972-05-18 |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
PS | Patent sealed | ||
PCNP | Patent ceased through non-payment of renewal fee |