You can see that the material of the bag contains a part of the paper can be collectively referred to as a paper bag. There are many varieties of paper bags, various paper materials, and many styles. White cardboard, kraft paper, gift bags, handbags, greaseproof paper bags, coated paper bags and other paper bags are generally made of white cardboard, white paper, art paper, kraft paper, and a small amount are made of special paper, according to the side and bottom of the bag Different from the bottom sealing method, there are four types of paper bags: open seamed bottom bag, open bonded corner bottom bag, valve type stitched bag, valve type flat hexagonal end bottom bonded bag, etc. Because of the open style factor, the name portable paper bag appeared. Some paper bags have handles. The bags are made of kraft paper with more than four layers to pack cement, fertilizer and other products. According to the performance of the packaged material, different paper bag types are used. Other paper bags: including file bags, envelopes, handbags, laminated paper bags, four-layer paper bags, medicine bags, clothing bags, food bags, shopping bags, gift bags, wine bags, cement bags, feed bags, wax paper bags, fertilizer bags. For different purposes, the designed specifications and sizes, including the thickness of the paper bag paper, have many requirements, so they must be customized according to the actual situation to achieve the purpose of double the result with half the effort, economical and practical, and provide for material reduction, green environmental protection, and corporate capital investment. With more protection, customized paper bags can take into account the needs of economy and marketing.
There are generally 3 ways to distinguish between good and bad paper:
1. Tear method: horizontally tear the paper bag, and the stubble is wood pulp paper, which has high strength; if the tear opening is neat and there is no stubble, it is straw pulp paper or wood pulp with less composition and low strength.
2. Hand rubbing method: soak the paper bag in water for a period of time, rub it with both hands after taking it out. If it is lint-free or rub-resistant, it means the paper is good.
3. Burning method: After burning, the paper with ash formed and not broken is good; the paper with broken ash is not formed and has poor quality.