Mitsubishi Paper Mills Limited

Mitsubishi Denki Kabushiki Kaisha

Mitsubishi Kasei Corporation

Masayuki Tsubaki

Touru Noda

Junji Harada

Massashi Kubbota

Tomoichi Morita

Takehiko Ajima

Hiroshi Matsuda

Masaru Takada

Osamu Kojima

Hidemoto Arai

Tetsuya Ashida

Hisao Yokoya

Kenzo Takahashi

Youichi Sugiyama

Nobushige Ikeya

Yasumine Yoshida

Hiroshi Tomimasu

Takuya Seri

Yasunosuke Sakai

The object of the present invention is to provide an excellent total heat exchanging element paper and a total heat exchanging element which are excellent in heat transferability, water vapor permeability and gas barrier properties and cause no mixing of supplied air and discharged air. The present invention provides a total heat exchanging element paper using a paper made using mainly a natural pulp beaten to a Canadian modification freeness of not more than 150 ml, a substantially non-porous total heat exchanging element paper comprising a substantially non-porous cellulosic base which contains a moisture absorbing agent, a non-porous total heat exchanging element paper having a high gas barrier property which has a thickness of not more than 100 &#x3bc;m and a carbon dioxide permeation constant specified in JIS K7126 of not more than 5.0&#xd7;10mol&#xb7;m/m&#xb7;s&#xb7;Pa, and a non-porous total heat exchanging element paper having a high enthalpy exchangeability which has a water vapor permeability specified in JIS Z0208 of not less than 1000 g/m&#xb7;24 Hr at 20&#xb0; C. and 65% RH.

Total heat exchanging element paper

The object of the present invention is to provide an excellent total heat exchanging element paper and a total heat exchanging element which are excellent in heat transferability, water vapor permeability and gas barrier properties and cause no mixing of supplied air and discharged air. The present invention provides a total heat exchanging element paper using a paper made using mainly a natural pulp beaten to a Canadian modification freeness of not more than 150 ml, a substantially non-porous total heat exchanging element paper comprising a substantially non-porous cellulosic base which contains a moisture absorbing agent, a non-porous total heat exchanging element paper having a high gas barrier property which has a thickness of not more than 100 &#x3bc;m and a carbon dioxide permeation constant specified in JIS K7126 of not more than 5.0&#xd7;10mol&#xb7;m/m&#xb7;s&#xb7;Pa, and a non-porous total heat exchanging element paper having a high enthalpy exchangeability which has a water vapor permeability specified in JIS Z0208 of not less than 1000 g/m&#xb7;24Hr at 20&#xb0; C. and 65% RH.

When latent heat is transferred between the two airflows flowing along the respective sides of each partition member, not only a layer of moisture absorbent but also a layer of flame retardant lies in the direction of transfer of the moisture. Thus, even if the moisture is absorbed by the layer of moisture absorbent, the layer of flame retardant resists the moisture transfer so that the amount of transfer of the moisture decreases in that part with a drop in the moisture permeability of the partition member. To solve the problem, there is provided a total heat exchanging element comprising partition members and spacing members having moisture permeable portions provided with moisture permeability and flame resisting portions provided with flame retardancy, the both portions not overlapping with each other within each single member. For example, the partition members have the moisture permeable portions provided with moisture permeability, and the spacing members have the moisture resisting portions provided with flame retardancy.

Total heat exchanging element

A support for an imaging material, which not only can give an imaging material and a print thereon having a high gloss appearance and being free of non-uniformity in gloss but also is improved in the property of peeling from a cooling roll and which has high stiffness and can be stably produced at a high speed, the support being a resin-coated-paper-based support for an imaging material, in which (1) each of a resin sheet on a side (front side) where an image is to be formed and a base paper has a multi-layered structure, (2) the base paper has a multi-layered structure, the resin sheet on the front surface is a polyolefin resin sheet and the paper layer constitution of the base paper is specified, or (3) the front resin sheet has a multi-layered structure constituted of an upper layer containing at least 50% by weight of a polyethylene resin having a density of at least 0.940 g/cmand a lower layer containing a largest amount of a polyethylene resin (b) having a density of less than 0.940 g/cmamong and the base paper is composed mainly of a natural pulp having a specific fiber length.

Support for imaging material

A resin coated paper-based support for an imaging material comprises a multilayered base paper and a polyolefin resin sheet on at least the image forming side of the paper base. The thickness, fiber length, pulp composition, and freeness of the paper layers comprising the multilayered base paper base are controlled in order to obtain an imaging material with high gloss, stiffness, and curl resistance. The polyolefin resin sheet may comprise one or more layers.

The task of the present invention is to provide an excellent resin-coated paper type support for imaging materials using a paper as a base which can provide imaging materials and prints made therefrom superior in visual gloss, cutting properties and curling properties. This task is attained by a support for imaging materials which comprises a paper mainly composed of natural pulp as a base, a resin layer (A) comprising a resin having film-formability coated on one side of the paper base on which an image forming layer is provided-and a resin layer (B) mainly composed of a polyethylene resin coated on another side of the paper base, wherein the natural pulp has a fiber length of 0.60 mm or less, the paper base has a density of 1.05 g/cm,or more, and the resin layer (B) mainly composed of a polyethylene resin is coated at 200 m/min or more.

Ink jet recording sheet

A photographic support comprising a paper substrate and the resin layers formed on both sides thereof, each of the resin layers being made of a resin composition comprising a polyethylene resin, wherein the difference in thickness between the resin layer on the side on which a photographic layer is to be provided and the resin layer on the opposite side is 3 .mu.m or greater, and the polyethylene resin in the resin layer on the side opposite from the photographic layer is a compounded resin prepared by melting and mixing a specified number of parts by weight of a specific low-density or medium-density polyethylene resin and a specified number of parts by weight of a specific high-density polyethylene resin. This resin-coated paper type photographic support has good adhesion between the base paper and the resin layer on the side opposite from the photographic layer, excellent in qualities such as anticurl properties, cutting properties and capable of high-speed production.

Photographic support

There is disclosed a support for photosensitive materials which comprises base paper comprising natural kraft pulp, and a resin layer formed on the base paper, said natural kraft pulp being produced by digesting wood chips by the kraft process, and washing the digested product in the presence of an anti-foaming agent or a foam-inhibitor, followed by bleaching by the use of chlorine or an oxidizing agent containing at least one chlorine atom, and said natural kraft pulp having a number of areas tarnished by silver tarnishing reaction of 20 or less. This support exhibits good photographic properties when a silver halide photosensitive layer is provided thereon.

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Tokyo, Japan

Masayuki Tsubaki