Kraft paper bags are widely used in our lives, it is environmentally friendly and practical, is an important material for coffee, chocolate, candy, pastries and other foods, so many food factories will choose kraft paper bag packaging products. So as a food factory, what should be done in order to choose inexpensive, high-quality kraft paper bags?
1. Thickness
In the purchase of kraft paper bags, the first thing to consider is the thickness of the general kraft paper bag thickness of 30 mm, 40 mm, 50 mm, 60 mm and so on. Since the thickness of the kraft paper bag directly affects its service life, it is necessary to take into account the actual situation when purchasing, and it is also necessary to choose according to the products you use.
Under normal circumstances, the service life of a kraft paper bag with a thickness of 40 mm will be longer than that of 30 mm. Therefore, when buying kraft paper bags, if the product has no special requirements, it is generally recommended to choose 40 mm thick kraft paper bags.
2. Printing quality
Observe the printing quality of kraft paper bags, see kraft paper surface in general, the quality of better kraft paper surface is clear, the wood pulp fiber pressure is more uniform, and the hand feels more textured, this kind of kraft paper is often better quality kraft paper, and the quality of poor kraft paper surface often has more impurities, the paper grain distribution is more chaotic, the texture is not obvious, The printing is clear, the color is bright for the paper better kraft paper bag.
3. Physical properties
Tear the paper bag horizontally, with stubble for wood pulp paper, high strength; If the tear is neat and there is no stubble, the composition of straw pulp paper or wood pulp is small and the strength is low, and the load-bearing capacity of this kraft paper bag is poor. You can also use the hand rub method, soak the paper bag in water for a period of time, and rub with both hands after taking it out, and the paper is good if it does not raise hair or rub.
4. Bonding strength
Kraft paper bag is composed of two layers of kraft paper and a layer of glue, and the type of adhesive is different, then its bonding strength is not the same. Under normal circumstances, when we buy kraft paper bags, we will bond its two layers of kraft paper, but in fact, this bonding method is not very good, because the types of adhesives are different, the concentration used is not the same. Therefore, we should choose the adhesive according to the actual situation.
5. Look at the manufacturer
Buy kraft paper bags or choose a strong factory, small-scale kraft paper bag manufacturers are generally budget production. (that is, purchase materials after receiving orders, processing and production); The quality of its own products has not passed, if in addition to road transportation, poor quality kraft paper bags are likely to be scrapped on the way.
