Abstract: The instrument′s detecting range was not accurate enough for detecting the gastransmission of single layer of plastic wrap when using differentialpressure method to detect the gastransmission. We detected the gastransmission of multilayer plastic wrap and found a relationship of the gastransmission and the layers of plastic wrap. Thus we could get accurate test results and expand the detection range of the instrument by use the relationship.

Key words: gas-transmission, differential-pressure method, plastic wrap