GB921436A - Improvements in and relating to single-worm extruders - Google Patents
Improvements in and relating to single-worm extrudersInfo
- Publication number
- GB921436A GB921436A GB26485/60A GB2648560A GB921436A GB 921436 A GB921436 A GB 921436A GB 26485/60 A GB26485/60 A GB 26485/60A GB 2648560 A GB2648560 A GB 2648560A GB 921436 A GB921436 A GB 921436A
- Authority
- GB
- United Kingdom
- Prior art keywords
- turns
- worm
- helix
- july
- reverse
- 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
- B29C48/55—Screws having reverse-feeding elements
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
Abstract
921,436. Extrusion machines. LONZA ELECTRIC & CHEMICAL WORKS Ltd. July 29, 1960 [July 31, 1959], No. 26485/60. Class 87(2). A single-worm extruder has a worm 1 characterized in that a number of turns 2 to 5 at the end a which faces the extrusion nozzle run oppositely to the turns 6 of the remaining part of the worm and that the product of the enclosed volume per turn and the pitch of these reverse turns is smaller than the corresponding product for the turns in the adjacent melting zone b of the worm, this being an essential condition for the production of a resultant feed motion towards the nozzle. The back-pressure which develops in the region of the reverse turns 2 opposes the feed motion and serves to miss the material which performs a motion in the pockets between the turns 2 approximately following a double spiral (i.e. a helix the axis of which is itself a helix).
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH7645159 | 1959-07-31 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB921436A true GB921436A (en) | 1963-03-20 |
Family
ID=4534936
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB26485/60A Expired GB921436A (en) | 1959-07-31 | 1960-07-29 | Improvements in and relating to single-worm extruders |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB921436A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3318848A (en) * | 1963-06-20 | 1967-05-09 | Celanese Corp | Melt hydrolysis of oxymethylene copolymers |
-
1960
- 1960-07-29 GB GB26485/60A patent/GB921436A/en not_active Expired
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3318848A (en) * | 1963-06-20 | 1967-05-09 | Celanese Corp | Melt hydrolysis of oxymethylene copolymers |
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