| 摘要 |
PURPOSE:To make printability good keeping mechanical strength capable of bearing high speed printing by a method wherein a plastic film of which a bubble content is under 20vol.% is laminated on one face or both faces of a plastic film of which the bubble content is a specific % by volume. CONSTITUTION:A film layer (a layer B) in which any bubble is hardly contained is laminated on one face or both faces of the film layer (a layer A) in which many fine independent bubbles are contained on a surface of or inside the film. Then, the layer made cushiony by containing an independent bubble and besides, surface roughness effective for film travelling is revealed. Further, the layer B is the layer for making up for decrease of mechanical strength of the layer A and besides, for controlling the film at a suitable surface roughness required for the film travelling. Therefore, a bubble content of the layer A is necessarily within a range of 20 to 60vol.% and further, the bubble content of the layer B is necessarily under 20vol.%. |
