| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a shielding shrink film which has light shielding property and heat insulating property, and which can be easily recycled in a simple constitution. <P>SOLUTION: The shielding shrink film is a crystalline polymer film which is made of a crystalline polymer and which contains a long cavity in the state that its long space is oriented in its longitudinal direction to a first direction in the crystalline polymer film, wherein the distance from the center of the cavity to the surface of the crystalline polymer film satisfies the relation of the formula: h(avg)>T/100, when calculating an arithmetic average h(avg) of the distances h(i) from respective centers to the surface of the crystalline polymer film about ten cavities that the distance (i) from the center of the cavity to the surface of the crystalline polymer film in a cross section perpendicular to the orientation direction of the cavities is shortest; and a heat-shrinkable synthetic resin film. In the formula, T expresses the arithmetic mean value of the thickness in the section, the ten cavities are selected from the cavities existing in the area sandwiched between arbitrary one straight line parallel with the thickness direction and the other straight line located separately by 20×T in parallel with one straight line. <P>COPYRIGHT: (C)2009,JPO&INPIT</p> |
