It is wrapped in a cylindrical membrane or flat membrane in a sleeve before the heat contraction, packaging after the completion of the packaging at both ends of a contraction port.
(1) When using cylindrical membrane, the tube membrane opening open, and then the use of the chute to push the product into the film, and then cut off the film. As shown in Figure 1. This method is more suitable for the cylindrical shape items wrapped, such as batteries, paper rolls, bottles, such as packaging. The advantage of using cylindrical membrane packaging is to reduce the 1 ~ 2 sealing process, beautiful appearance, the disadvantage is not suitable for product diversification requirements, only applicable to a single product mass production.
(2) with flat film wrapping articles, it is useful to wrap two kinds of Dan Changping film and double Zhang Ping film wrapping. The film should be wider than the object, with double Zhang Ping film, that is, using the top, the next two film wrapping, in the previous package to complete the sealing and shearing, the two pieces of membrane is sealed up, and then the product with a machine or hand to the upright film, in place after the sealing and shearing mechanism whereabouts, the product of the other side of the sealing and cutting, film wrapped products after the heat shrinkage, the two ends of the package to form oval openings, with Dan Changping film, the first flat film, will be wrapped products to the middle of the flat film into the capsule, forming a horseshoe wrap, Heat sealing and sealing.