GB815173A - Improved method for moulding expandable thermoplastic resinous materials and mouldedarticles thereby obtained - Google Patents
Improved method for moulding expandable thermoplastic resinous materials and mouldedarticles thereby obtainedInfo
- Publication number
- GB815173A GB815173A GB3478/57A GB347857A GB815173A GB 815173 A GB815173 A GB 815173A GB 3478/57 A GB3478/57 A GB 3478/57A GB 347857 A GB347857 A GB 347857A GB 815173 A GB815173 A GB 815173A
- Authority
- GB
- United Kingdom
- Prior art keywords
- mass
- mould
- heated
- zone
- copolymers
- 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
-
- 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
- B29C44/38—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length
- B29C44/42—Feeding the material to be shaped into a closed space, i.e. to make articles of definite length using pressure difference, e.g. by injection or by vacuum
Landscapes
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Molding Of Porous Articles (AREA)
Abstract
A method of moulding expandable granular thermoplastic resinous material to form a moulded foam structure comprises charging the granules into the injection chamber of an injection moulding apparatus where they are forced under pressure sequentially into and through a first cold zone to compact a portion of them into a solid granular mass below its foaming temperature, a second heated zone where a portion of the mass is heated to a flowable condition above the foaming temperature, and a discharge zone from which a portion of the heated mass is injected into a mould where it expands to the confining limits of the mould. The solid compacted portion of the mass in the first zone continuously maintains the heated portion of the mass in the second zone under pressure to restrain foaming therein throughout the intermittent moulding cycles. The effluence of the heated mass from the discharge zone is arrested, except during injection into the mould, either by means of a valve or by providing between the discharge zone and the mould a restraining passageway with a high pressure drop. The moulded foam structure may be given an unexpanded surface layer by injecting the material into a cooled mould with an enlargeable cavity, and, after the surface layer has been formed under pressure, relieving the pressure and enlarging the mould to permit the central uncooled heated mass to expand. Suitable resinous materials for use in this invention include styrene polymers and copolymers; vinylidene chloride copolymers; polymers and copolymers of methyl methacrylate, ethyl acrylate, and other derivatives of acrylic acid; polymers and copolymers of vinyl acetate and vinyl butyral; and cellulose derivatives, e.g. cellulose acetate and cellulose nitrate.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US815173XA | 1956-02-24 | 1956-02-24 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB815173A true GB815173A (en) | 1959-06-17 |
Family
ID=22164700
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB3478/57A Expired GB815173A (en) | 1956-02-24 | 1957-01-31 | Improved method for moulding expandable thermoplastic resinous materials and mouldedarticles thereby obtained |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB815173A (en) |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1232729B (en) * | 1962-06-28 | 1967-01-19 | Pfaff Ag G M | Process for the production of porous, oil-containing bearings from plastic |
DE1233578B (en) * | 1961-11-07 | 1967-02-02 | Bayer Ag | Process and injection molding machine for the production of moldings from thermoplastics provided with blowing agents |
DE1486392B1 (en) * | 1963-10-23 | 1970-04-16 | Haveg Industries Inc | Method for producing liquid-tight packaging containers |
DE1778258B1 (en) * | 1968-04-11 | 1970-11-12 | Sued West Chemie Gmbh | Process for the production of molded articles from high molecular weight low pressure polyethylen |
CN111566154A (en) * | 2017-12-01 | 2020-08-21 | 阿科玛股份有限公司 | Foamable acrylic composition |
-
1957
- 1957-01-31 GB GB3478/57A patent/GB815173A/en not_active Expired
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE1233578B (en) * | 1961-11-07 | 1967-02-02 | Bayer Ag | Process and injection molding machine for the production of moldings from thermoplastics provided with blowing agents |
DE1232729B (en) * | 1962-06-28 | 1967-01-19 | Pfaff Ag G M | Process for the production of porous, oil-containing bearings from plastic |
DE1486392B1 (en) * | 1963-10-23 | 1970-04-16 | Haveg Industries Inc | Method for producing liquid-tight packaging containers |
DE1778258B1 (en) * | 1968-04-11 | 1970-11-12 | Sued West Chemie Gmbh | Process for the production of molded articles from high molecular weight low pressure polyethylen |
CN111566154A (en) * | 2017-12-01 | 2020-08-21 | 阿科玛股份有限公司 | Foamable acrylic composition |
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