Multi-layer paper peelable into at least two thin sheets
AssigneesRicoh Company, Ltd., Tohoku Ricoh Co., Ltd., Mishima Paper Co., Ltd.
InventorsHideyuki Yamaguchi, Hiroshi Tateishi, Ippei Kato, Munenaka Koyama, Yoshihiro Mimura
Life of this patent
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Abstract
Disclosed is a multi-layer paper suitable as a material for preparing heat-sensitive stencil printing masters. The multi-layer paper is produced by combining a plurality of thin paper layers by paper making. The multi-layer paper has a peel strength of 10 N/m or less and may be delaminated into at least two tissue sheets.
Claims226
A multi-layer paper comprising at least two paper layers combined by a paper making method, characterized in that said multi-layer paper has at least one peelable paper layer interface having a peel strength of 10 N/m or less, and in that said multi-layer paper is peelable into at least two tissue sheets at said peelable paper layer interface.
A multi-layer paper comprising at least three paper layers unified by a paper making method, characterized in that said multi-layer paper has, as an intermediate layer, at least one paper layer which can cause intralayer delamination and which has a peel strength of 10 N/m or less, and in that said multi-layer paper is peelable into at least two tissue sheets at said intermediate paper layer.
A multi-layer paper as claimed in 21, wherein said paper layer which can cause intralayer delamination is mainly made of polyester fibers.
A multi-layer paper as claimed in 22, wherein said paper layer which can cause intralayer delamination is mainly made of polyester fibers.
A multi-layer paper as claimed in 23, wherein said paper layer which can cause intralayer delamination is mainly made of polyester fibers.
A multi-layer paper as claimed in 24, wherein said paper layer which can cause intralayer delamination is mainly made of polyester fibers.
Dependencies are inferred from the claim text.