Valve port packaging bag is a small bulk packaging container, convenient, neat, good sealing, is one of the most popular packaging forms in the world at present, is a new environmentally friendly packaging products, especially suitable for export packaging. When used, the material can be fed from the top or the bottom of the valve port. The special filling equipment is adopted. After filling the material, it will be in three-dimensional shape, and the packing is neat and beautiful.
Valve pocket features: the valve pocket has the advantages of improved packing efficiency, convenient transportation, strong firmness and low breakage rate.
Valve pocket classification: valve pocket can be divided into the following categories according to different materials:
Paper-plastic composite valve pocket is made of plastic woven bag (referred to as cloth) as the base material, after the casting method of composite (cloth/film/paper composite for three in one);
Kraft paper valve pocket is made of kraft paper, (kraft paper is mainly divided into imported kraft paper and domestic kraft paper two kinds) kraft paper layer according to the use of general from one layer to six layers, the middle can be coated or add PE plastic film.
PE valve pocket: commonly known as heavy bag valve pocket, made of polyethylene film, the thickness of the film is generally between 8-20 wire.
Low melting point valve pocket: made of low melting point polyethylene film, the thickness of the film is generally between 8-20 wire, suitable for chemical enterprises in the production line mass production use, can add less pollution, reduce the labor intensity of workers.
Composite valve pocket: it is a new type of material with the printability of paper and the moisture-proof and fastness of plastic.
Valve pocket printing: generally one to four colors, up to eight colors.
Good strength. Woven bags are commonly used to seam of bottom and sealing, sewing thread when the bottom of the seal or sewing stitches will puncture, back and forth on the woven bag can produce stress effect on the woven bag, cause the decrease of strength of woven bag sewing place (only the bag body is two-thirds of the intensity) is easily broken packages, and adopting the adhesive side bottom valve pocket bottom up and down the two layers of woven cloth adhesive. It can be more than twice as strong as a bag woven fabric.
