Payment & Shipping Terms:
|Outside Materials:||Kraft Paper||Inside Material:||Poly Bubble|
|Color:||Gold / White / Natural||Kraft Paper Thickness:||125gsm|
|Usage:||Express，office，delivery，shopping||Unique Specialty:||Keep The Words By Writing|
Delivery Industry Kraft Bubble Mailers 245x330 #A4 Padded Envelope
|Kraft envelopes are easy to understand in envelopes made of kraft paper. When there was no telephone at that time, there was only a letter to write, so the envelope was so many and often seen at that time. It was not noticed at the time that the envelope was made of kraft paper. And now I'm working on kraft paper, and there's a wonderful feeling. And now the envelope of the envelope is the "envelope paper" that is sold in the letter and paper industry in Dongguan, the so-called "Jing Niu". The envelop kraft paper is made for all wood pulp, with bright color, smooth double side and good fiber, so the refined kraft paper is also the love of the printing industry. All wood pulp is made, the paper quality is uniform and the tensile strength is good. Can be used for envelopes, paper boxes, feed bag, flour bag, slitting, paint, food, and clothing, products and packaging and bag; suitable for printing factory, a factory, bag factory, factory is factory sealed envelopes. For the production of envelopes, bags, packaging bags, file bag, composite film such as printing and packaging products, can also be used for high-grade product.|
|Kraft bubble mailers
Kraft bubble mailers or kraft is paper or paperboard (cardboard) produced from chemical pulp produced in the kraft process.
Sack Kraft bubble mailers, or just sack paper, is a porous Kraft bubble mailers with high elasticity and high tear resistance, designed for packaging products with high demands for strength and durability.
Pulp produced by the kraft process is stronger than that made by other pulping processes; acidic sulfite processes degrade cellulose more, leading to weaker fibers, and mechanical pulping processes leave most of the lignin with the fibers, whereas kraft pulping removes most of the lignin present originally in the wood. Low lignin is important to the resulting strength of the paper, as the hydrophobic nature of lignin interferes with the formation of the hydrogen bonds between cellulose (and hemicellulose) in the fibers.
Kraft pulp is darker than other wood pulps, but it can be bleached to make very white pulp. Fully bleached kraft pulp is used to make high quality paper where strength, whiteness and resistance to yellowing are important.
|Materials Classification :||PP|
|Melting Point :||164℃~170℃|
|Working Temperature :||-30℃~140℃|
|Material Density :||1.15g/cm³|
|Conventional Size :||245x330 #A4-2|
|Sample Color :||Aquamarine|
|Basic Material :||BOPP|
|Protruding Characteristics :||Antistatic|
|Application Industry :||Candy|
|Shape Style :||Stand Up Zipper|
|Polypropylene is a non-toxic, odorless, odorless, milky white crystalline polymer with a density of only 0. 90--, "0. 91g/cm³", and is one of the lightest varieties of all plastics. It is particularly stable in water, the water absorption in water is only 0.01%, molecular weight of about 8, in case of 150 thousand. The formability is good, but the shrinkage rate is large (1%~2.5%). The thick wall products are easy to sag, and the parts with high dimensional precision are difficult to meet the requirements, and the surface gloss of the products is good.|