GB749919A - Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride - Google Patents
Improvements in and apparatus for the production of blown foils of hard polyvinyl chlorideInfo
- Publication number
- GB749919A GB749919A GB26193/53A GB2619353A GB749919A GB 749919 A GB749919 A GB 749919A GB 26193/53 A GB26193/53 A GB 26193/53A GB 2619353 A GB2619353 A GB 2619353A GB 749919 A GB749919 A GB 749919A
- Authority
- GB
- United Kingdom
- Prior art keywords
- pict
- polyvinyl chloride
- core
- endless screw
- screw
- 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
- 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
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
-
- 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
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
-
- 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
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
<PICT:0749919/IV(a)/1> <PICT:0749919/IV(a)/2> <PICT:0749919/IV(a)/3> <PICT:0749919/IV(a)/4> Tubular foils are produced from hard polyvinyl chloride by means of an endless screw press in which the ratio of the space between the first threads to the space between the last threads is between 3 : 1 and 5 : 1, together with a blowing head having a cross-section free from obstruction within the whole of the straight part before the annular orifice. Stabilizers and/or waxes may be added to the material before plasticising. Fig. 1 shows an endless screw press 1 which feeds the material to an extrusion head 2 having an unobstructed annular passage, air being blown in at 3 to produce a tubular foil 4, which is flattened by rollers 5 and wound up at 6. The endless screw may have any of the shapes shown in Figs. 2-4 to give the specified degree of compression of the material being fed. In Fig. 2 the core of the screw is tapered, in Fig. 3 the core is cylindrical, but the pitch of the thread becomes smaller towards the discharge end, in Fig. 4 the core is tapered and the thread pitch becomes smaller. A multiplethread endless screw may also be used. For powdered polyvinyl chloride, the length of the screw should be 10-20 times its diameter.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB26193/53A GB749919A (en) | 1953-09-23 | 1953-09-23 | Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB26193/53A GB749919A (en) | 1953-09-23 | 1953-09-23 | Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride |
Publications (1)
Publication Number | Publication Date |
---|---|
GB749919A true GB749919A (en) | 1956-06-06 |
Family
ID=10239806
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB26193/53A Expired GB749919A (en) | 1953-09-23 | 1953-09-23 | Improvements in and apparatus for the production of blown foils of hard polyvinyl chloride |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB749919A (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3343216A (en) * | 1962-10-22 | 1967-09-26 | Dow Chemical Co | Apparatus for the preparation of foamed sheet material |
EP0045501A2 (en) * | 1980-08-01 | 1982-02-10 | Union Carbide Corporation | Method for extruding granular low density narrow molecular weight distribution linear ethylene polymers |
EP0051880A2 (en) * | 1980-11-12 | 1982-05-19 | Union Carbide Corporation | An apparatus and method for extruding ethylene polymers |
EP0595112A1 (en) * | 1992-10-26 | 1994-05-04 | Bridgestone Corporation | Screw for double-shaft extruding device and double-shaft extruding device |
-
1953
- 1953-09-23 GB GB26193/53A patent/GB749919A/en not_active Expired
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3343216A (en) * | 1962-10-22 | 1967-09-26 | Dow Chemical Co | Apparatus for the preparation of foamed sheet material |
EP0045501A2 (en) * | 1980-08-01 | 1982-02-10 | Union Carbide Corporation | Method for extruding granular low density narrow molecular weight distribution linear ethylene polymers |
EP0045501A3 (en) * | 1980-08-01 | 1983-01-19 | Union Carbide Corporation | Method for extruding granular low density narrow molecular weight distribution linear ethylene polymers |
EP0051880A2 (en) * | 1980-11-12 | 1982-05-19 | Union Carbide Corporation | An apparatus and method for extruding ethylene polymers |
EP0051880A3 (en) * | 1980-11-12 | 1983-01-26 | Union Carbide Corporation | An apparatus and method for extruding ethylene polymers |
EP0595112A1 (en) * | 1992-10-26 | 1994-05-04 | Bridgestone Corporation | Screw for double-shaft extruding device and double-shaft extruding device |
US5464282A (en) * | 1992-10-26 | 1995-11-07 | Bridgestone Corporation | Screw for double-shaft extruding device and double-shaft extruding device |
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