Toyo Boseki Kabushiki Kaisha

Fuji Seal International, Inc.

Toyobo Co., Ltd.

Masatoshi Hashimoto

Norimi Tabota

Katsuhiko Nose

Masayuki Haruta

Hiroshi Nagano

Yukinobu Mukoyama

Kyoko Inagaki

Masakazu Iwasaki

Seizo Takabayashi

Hideki Ito

Mitsuo Inoue

Tsutomu Isaka

Naonobu Oda

Kenji Kawai

Satoshi Hayakawa

Takuro Endo

Tsutomu Oko

Kuniharu Mori

Shinichiro Okumura

Shigetomo Yamamoto

Tetsuya Anami

Atsuhiko Ohtsuka

A heat-shrinkable white polyester film is provided which has extremely satisfactory cuttability along a perforation and has light-shielding properties. Also provided are: a label; and a process for producing the film with high productivity. The heat-shrinkable white polyester film comprises a polyester resin constituted of ethylene terephthalate as a main constituent component and containing at least 13 mol % one or more monomer ingredients capable of serving as an amorphous component among all components of the polyester resin. This film has specific heat shrinkability, specific light-shielding properties, and specific mechanical properties. The process is excellent in the productivity of the film. The label is obtained from the heat-shrinkable white polyester film.

Heat-shrinkable white polyester film, process for producing heat-shrinkable white polyester film, label, and package

The inventive heat-shrinkable polyolefin film is high in shrinkability in the longitudinal direction that is its main shrinkage direction and excellent in finish properties after shrinkage, perforated line openability, and thermal blocking resistance. The heat-shrinkable polyolefin film is characterized by particular values with respect to hot-water heat shrinkage ratio in the longitudinal and width directions, right angle tear strength in the width direction, and heat-resistant peel strength.

Heat shrinkable polyolefin film and process for producing the same

The invention aims at providing a heat-shrinkable polyester film which is excellent in tearability along perforations and in break resistance after storage when used as labels of beverage bottles. The invention relates to a heat-shrinkable polyester film which is made of a polyester resin comprising ethylene terephthalate as the main constituent and containing at least 13 mol % of at least one monomer capable of forming an amorphous component in the whole polyester resin component and which has specific heat shrinkage characteristics and exhibits specific mechanical characteristics after heat shrinking treatment. The film can be produced by a sequential biaxial orientation process comprising longitudinal orientation step, intermediate heat treatment step, positive cooling step, transverse orientation step, and final heat treatment step.

Process for production of heat-shrinkable polyester film, heat-shrinkable polyester film and packages

A heat-shrinkable polyester film is provided which exhibits a high shrinkability in a high-temperature range with a main shrinking direction oriented in a longitudinal direction thereof, though not shrinking in the longitudinal direction in a low-temperature range, possesses an extremely high mechanical strength in a transverse direction orthogonal to the main shrinking direction, and, in particular, can be utilized suitably as a film for forming a jacket label of a battery or in similar applications.

Heat-shrinkable polyester film and process for producing the same

A heat-shrinkable polyester film is obtained which is extremely satisfactory in openability along a perforation, has exceedingly high productivity, and is less apt to split in the lengthwise direction in processing, e.g., printing. Provided is a label which is formed from the heat-shrinkable film and is satisfactorily tearable. The label is one formed from a tubular material which comprises as a base a heat-shrinkable film thermally shrinking mainly in the film width direction and which has been cut according to an object to be packaged, both edges in the film width direction having been bonded to each other. The tubular material has been thermally shrunk to constitute the label, with which at least part of the periphery of the object to be packaged is covered. The label has an angle tear strength in the direction perpendicular to the main shrinkage direction (i.e., in the film length direction) of 100-310 N/mm and a tensile break strength in the direction perpendicular to the main shrinkage direction (i.e., in the film length direction) of 50-300 MPa.

Label

A heat-shrinkable polyester type film has a dynamic friction coefficient of at least one face with one face of another film of &#x3bc;d&#x2266;0.27 and range R&#x2266;0.05 and a weight loss of less than 0.24 g/mafter 10 reciprocation times with 400 g load using a color fastness rubbing tester comprising a friction element bearing a sand paper with #1000 particle diameter.

Heat-shrinkable polyester-type film

An object of the present invention is to provide a heat-shrinkable polyester film having a good light blocking property even when the label is not auxiliary processed by printing. The present invention provides a heat-shrinkable polyester film mainly made of a polyester resin, wherein the film has a total luminous transmittance of not more than 40%, a haze of not less than 90%, a sample film has a heat shrinkage percentage of not less than 50% in the maximum shrinkage direction and a heat shrinkage percentage of not more than 10% in a direction orthogonal to the maximum shrinkage direction, the sample film being in a size of 10 cm&#xd7;10 cm cut off from the film and obtained by immerse in hot water at 95&#xb0; C. for 10 seconds, subsequently in water at 25&#xb0; C. for 10 seconds, and withdrawing.

Heat-shrinkable polyester films

A heat-shrinkable polyester film having a shrinkability in hot water (hereinafter referred to as a hot-water shrinkability) at 95&deg; C. for 10 seconds ranging from 30% to 50% in at least one direction (hereinafter referred to as direction (A)) and ranging from 25% to 45% in a direction (hereinafter referred to as direction (B)) perpendicular to said at least one direction, wherein a difference &Dgr;HS between the hot-water shrinkability in direction (A) and the hot-water shrinkability in direction (B) (ie., &Dgr;HS&equals;&verbar;hot-water shrinkability in direction (A)&mdash;hot-water shrinkability in direction (B)&verbar;) is 10% or smaller, is useful as a wrapping material, mainly as a covering material for the openings of vessels used for packing noodles, puddings, salads, and other foods.

Heat-shrinkable polyester films which exhibit a total light transmittance of 80% to 90% and a haze of 15% to 60%, both in a thickness of 50 &mgr;m and further exhibit a 45-degrees specular gloss of 70% or lower, so that they have frosted glass appearances without being printed or processed. Heat-shrinkable polyester films which exhibit a light transmittance of 0% to 20% at a wavelength of 380 nm and of 0% to 60% at a wavelength of 400 nm and further exhibit a haze of 15% or lower, so that they can prevent the contents of a vessel fitted therewith from being deteriorated by ultraviolet light and they have good shrinkage finish and particularly cause only rare occurrence of wrinkles, shrinkage spots, or other defects. These films are suitable for labels, particularly for labels of great product value.

In a thermo-shrinkable polyester film, the thermal shrinkage ratio in a main shrinking direction is about 20% or more after being treated in water of about 70.degree. C. for about seconds, about 35 to about 55% after treated in water of about 75.degree. C. for about 5 seconds, and about 50 to about 60% after being treated in water of about 80.degree. C. for about 5 seconds. After the film is shrunk by about 5% by treatment in water of about 75.degree. C. for about 10 seconds, the probability of the elongation at rupture of the film in the direction perpendicular to the main shrinking direction being about 20% or less, is about 10% or less. The ratio of .tau..sub.1 /.tau..sub.2 is about 0.05 to about 0.45, where .tau..sub.2 is the stress of shrinkage in a main shrinking direction of the film at about 90.degree. C., and .tau..sub.1 is the stress of shrinkage in a direction perpendicular to the main shrinking direction of the film at about 90.degree. C. The sealing strength of the film is about 1.2 kg/15 mm of width or more.

Growing community of inventors

Inuyama, Japan

Masatoshi Hashimoto