Plastic Packing Bag Having Excellent Transparency and Freshness and Process of Preparing Same

摘要

An objective of the present invention is to provide a new plastic packing bag (vinyl packing bag) which is capable of maintaining freshness of fruit or vegetable for a long time. A manufacturing method of the plastic packing bag of the present invention comprises the steps of: mixing 80 to 90 wt% of low density polyethylene (LDPE) with 10 to 20 wt% of a freshness maintenance agent to prepare master batch chips; manufacturing an inner flat sheet fabric (LLDPE fabric) from a mixture of 70 wt% of linear low density polyethylene (LLDPE), 15 to 30 wt% of the master batch chips and 0 to 15 wt% of low density polyethylene (LDPE) by a blow molding process; laminating a separately manufactured outer flat sheet fabric with the inner flat sheet fabric to manufacture a bag fabric; and processing the manufactured bag fabric to complete various packing bags. The outer flat sheet fabric may preferably include films of synthetic resins such as polyester (PET), polypropylene (PP), and nylon, and items required as the packing bag have been printed on the packing bag. The laminating process may be preferably performed by dry laminating or T-die laminating.