GB740393A - Improvements relating to the stretching of film of synthetic linear organic polymeric material - Google Patents
Improvements relating to the stretching of film of synthetic linear organic polymeric materialInfo
- Publication number
- GB740393A GB740393A GB13516/53A GB1351653A GB740393A GB 740393 A GB740393 A GB 740393A GB 13516/53 A GB13516/53 A GB 13516/53A GB 1351653 A GB1351653 A GB 1351653A GB 740393 A GB740393 A GB 740393A
- Authority
- GB
- United Kingdom
- Prior art keywords
- rolls
- idler
- roll
- fast
- film
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
- B29C55/06—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed
- B29C55/065—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique parallel with the direction of feed in several stretching steps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Systems And Boosters (AREA)
Abstract
<PICT:0740393/IV(a)/1> A travelling continuous web of film of synthetic linear organic polymeric material is continuously stretched longitudinally by opposed tensional forces acting lengthwise of the web over a substantial distance, the web being maintained between the forces in contact with a number of closely-spaced, parallel idler rolls, each freely rotatable on an axis at right-angles to the length of the web, and the web following a sinuous path over and under alternate idler rolls. The opposed tensional forces are preferably provided by means of two groups of positively driven rolls, the number of idler rolls between them being such that the last idler roll is rotating at substantially the same speed as the fast rolls. Preferably also the clearances between the last positively-driven slow roll and the first idler roll, between adjacent idler rolls, and between the last idler roll and the first fast roll do not exceed 1.5-5 times the thickness of the film before stretching. As shown in Fig. 1, the first group of five rolls A-E are the positively driven "slow" rolls, the second group of five rolls are idler rolls over which actual stretching is effected, and the third group of five rolls F-J are positively driven "fast" rolls. All the rolls are 30 inches wide and 4.5 inches o.d. The clearance between adjacent slow rolls and adjacent fast rolls is 4 inches, and that between the last slow roll and the first idler roll, between adjacent idler rolls and between the last idler roll and the first fast roll is 0.012 inch. In an example polymeric polyethylene glycol terephthalate is extruded to form an amorphous film 20 inches wide and 0.004 inch thick which is stretched as described above, the slow rolls being driven at a peripheral speed of about 9.7 yards/minute and the idler rolls and the fast rolls at a peripheral speed of about 26.7 yards/minute, giving a stretch ratio of about 2.75. All the stretch occurs by the time the seventh idler roll is reached. The stretched film is 18 inches wide and 0.0014 inch thick. All the rolls are internally heated to give a surface temperature of 85-90 DEG C. The film material may be a polyamide such as polyhexamethylene adipamide or sebacamide or polycaproamide, vinylidene chloride, rubber hydrochloride, polystyrene, polyvinyl alcohol, polyvinyl acetals or vinyl acetate-chloride copolymer. U.S.A. Specifications 2,071,250, 2,071,253 and 2,465,319 are referred to.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US740393XA | 1952-06-05 | 1952-06-05 |
Publications (1)
Publication Number | Publication Date |
---|---|
GB740393A true GB740393A (en) | 1955-11-09 |
Family
ID=22117327
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
GB13516/53A Expired GB740393A (en) | 1952-06-05 | 1953-05-14 | Improvements relating to the stretching of film of synthetic linear organic polymeric material |
Country Status (1)
Country | Link |
---|---|
GB (1) | GB740393A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2040910A1 (en) * | 2006-07-18 | 2009-04-01 | 3M Innovative Properties Company | Calendering process for making an optical film |
-
1953
- 1953-05-14 GB GB13516/53A patent/GB740393A/en not_active Expired
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP2040910A1 (en) * | 2006-07-18 | 2009-04-01 | 3M Innovative Properties Company | Calendering process for making an optical film |
EP2040910A4 (en) * | 2006-07-18 | 2012-03-07 | 3M Innovative Properties Co | Calendering process for making an optical film |
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