Title:
TRANSPARENT HIGH-DENSITY POLYETHYLENE FILM AND PROCESS FOR ITS PRODUCTION
Document Type and Number:
WIPO Patent Application WO/1987/002933
Kind Code:
A1
Abstract:
A 10- to 200 mum-thick, transparent high-density polyethylene film of 0.935 g/cm3 more in density having a haze value of less than 10%. It has a surface roughness of 0.001 to 0.15 mum, a C-axis orientation function (Fc) within the film of 0.10 to 0.50, and a difference in refractive index DELTAn between the amorphous portion and the crystalline portion within the film of 0.1000 to 0.1070. This film is produced by passing raw film through three heating rolls, i.e. a first heating roll (R1), a second heating roll (R2), and a third heating roll (R3) which are so heated that the temperature of R2 is higher than that of R1 and R3, and that the temperature of R2 is not higher than the m.p. of the film and not lower than 105oC, and cooling the film. The film thus obtained has an excellent transparency, well-balanced strength in a machine direction and a transverse direction, remarkably large impact strength, and high Young's modulus, and is suited for use as wrapping film for containers of cigarettes, caramels, chocolates and confectionery such as chewing gum or candy.
Inventors:
KOTANI TERUMITSU (JP)
TAKA TOSHIO (JP)
SAITO YOSHIMASA (JP)
TAKA TOSHIO (JP)
SAITO YOSHIMASA (JP)
Application Number:
PCT/JP1986/000566
Publication Date:
May 21, 1987
Filing Date:
November 07, 1986
Export Citation:
Assignee:
SHOWA DENKO KK (JP)
International Classes:
B29C43/52; B29D7/01; C08J5/18; B29C43/24; (IPC1-7): B29C71/02; B29C55/06; B29C55/18; B29C55/28; B29D7/01; C08J5/18; C08J7/00
Foreign References:
| JPS53117069A | 1978-10-13 | |||
| JPS5116360A | 1976-02-09 | |||
| JPS5331768A | 1978-03-25 | |||
| JPS595032A | 1984-01-11 |
Other References:
See also references of EP 0246328A4
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