Toyo Kagaku Kabushiki Kaisha

Sanyo-Kokusaku Pulp Co., Ltd.

Toyo Chemical Co., Ltd.

Ippei Chimura

Hiroshi Asakura

Keisuke Kitazume

Akio Ueno

Shirou Fuse

Yoshiyuki Kaneko

Sachio Maruchi

Tomishi Shibano

Saburo Akimoto

Masahiro Fukaya

Teruaki Taguchi

Shiro Fuse

Renzo Minagawa

A composite packing film is provided which comprises a base film having relatively small longitudinal and transverse elongations of not more than 10%, a layer of unidirectionally elongated film elongated in one direction and laminated on one face of said base film through an adhesive, a layer of an elongated film elongated at least in the direction substantially perpendicular to said first direction and laminated on the other face of said base film through an adhesive, and a sealant layer having a melting point lower than those of said elongated films and laminated on either one of the external faces of said elongated films, the difference between the resistance against end tearing of said unidirectionally elongated film and the resistance against end tearing of said latter-mentioned elongated film being not less than 15 kg. A packing bag made of the composite film is also provided.

Composite packing film and packing bag made of the same

A widthwise-stretched film is lap-sealed on one side of a backing paper, and polyethylene is extruded and coated on the surface of said film to form a release layer thereon. A pressure-sensitive adhesive composed mainly of polyacrylic ester is then coated on the other side of the backing paper. In this manner, a paper-backed adhesive tape of the pressure-sensitive type is prepared.

Process for the preparation of paper-backed adhesive tapes of the

An adhesive tape is provided which comprises a film of high density polyethylene having a density of not less than 0.94g/cc elongated at least six times only transversely to the longitudinal direction of the tape and a layer of pressure sensitive adhesive applied at least on one side of said elongated film of high density polyethylene. The adhesive tape has a high tensile strength against a force applied in a direction transverse to the longitudinal direction of the tape. Nevertheless, the tape can be easily torn or cut by user's hand or hands exactly transversely to the longitudinal direction of the tape without being torn zigzag or in a slanting direction.

Adhesive tape

An adhesive tape is provided which comprises a base paper material having a thickness of 30 to 150 g/m.sup.2, a film of high density polyethylene having a density of not less than 0.94 g/cc elongated at least six times only transversely to the longitudinal direction of the tape and having a thickness of 15 to 30.mu., said elongated film being attached to one side of said base paper material with a first layer of low density polyethylene of a thickness of 7 to 50.mu. being extruded between the base paper material and the elongated film, a second layer of low density polyethylene of a thickness of 7 to 50.mu. being extruded and attached to said elongated film so that the elongated film is sandwiched between the first and second layers of low density polyethylene, and a layer of pressure sensitive adhesive applied to the other side of said base paper material. The adhesive tape has a high tensile strength against a force applied in a direction transverse to the longitudinal direction of the tape. Nevertheless, the tape can be easily torn or cut by user's hand or hands exactly transversely to the longitudinal direction of the tape without being torn zigzag or in a slanting direction.

An adhesive tape is provided which comprises a film of high density polyethylene having a density of not less than 0.94 g/cc elongated at least six times only transversely to the longitudinal direction of the tape and a layer of pressure sensitive adhesive applied at least on one side of said elongated film of high density polyethylene. The adhesive tape has a high tensile strength against a force applied in a direction transverse to the longitudinal direction of the tape. Nevertheless, the tape can be easily torn or cut by user's hand or hands exactly transversely to the longitudinal direction of the tape without being torn zigzag or in a slanting direction.

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Kamakura, Japan

Ippei Chimura