What material is the kraft paper plastic composite bag made of

Kraft paper bag is a type of packaging container made of composite materials or pure kraft paper. It is non-toxic, odorless, pollution-free, low-carbon and environmentally friendly, in line with national environmental regulations. It has high strength and high environmental protection, and is currently one of the most popular environmentally friendly packaging materials internationally. Paper plastic composite bags are made by combining plastic and kraft paper. The plastic layer is usually made of flat silk woven fabric based on polypropylene (PP) or polyethylene (PE), while the kraft paper is made of refined composite special kraft paper, which has the characteristics of high strength, good waterproofing, and beautiful appearance. Simply put, the paper plastic composite bag consists of two layers: a woven bag and a layer of kraft paper, which are glued together. Kraft paper bags are made of all wood pulp paper as the base material, with white kraft paper and yellow kraft paper colors. PP material can be used to coat a layer of film on the paper for waterproof effect. The bag strength can be made into one to six layers according to customer requirements, and printing and bag making are integrated. The methods of opening and sealing are divided into heat sealing, paper sealing, and bottom sealing.