| 摘要 |
<p>PURPOSE:To enable boiling or retort sterilization by putting food in the title film and storage of the food without changing in quality, by a method wherein a specific polyamide resin film and a copolymer film of ethylene and vinyl alcohol are used in layers. CONSTITUTION:A copolymer (EVOH) film of ethylene and vinyl alcohol is stuck to one side of a polyamide resin (MX) film obtained by performing polycondensation reaction of methaxylenediamin and ajipic acid. A copolymer (EM) films containing ethylene and unsaturated carboxylic acid are interposed on both sides of the foregoing film, over which an olefin resin (PO) films are stuck for formation of the title film. The MX and EVOH possess merits respectively that permeability of high-temperature oxygen is low and the permeability of the oxygen is low at the normal temperature. However, permeability to vapor of both of them is high. This defect can be solved by sticking the PO films on both sides of the MX film and EVOH film. Since the MX and PO and EVOH and PO do not adhere directly to each other among them, sticking is performed by interposing the EM among them.</p> |
