What is parchment? Parchment, also known as industrial production parchment, is the transparent packaging bag and the raw material for making books or books. It is mainly used for packaging machine parts, instrument panels, chemical plant drugs, etc. The key raw materials for the production of parchment are organic chemical wood pulp and rag pulp.
After the raw materials are made into paper, they are sent to a 76% concentrated sulfuric acid bath for more than ten minutes. This process is called the "parchment" effect. The characteristics of parchment are the inseparable structure, strong anti drying, moisture-proof, high wet compressive strength, airtight, good ductility. The parchment has undergone the process of parchment, with high toughness and necessary folding resistance, and can be used as a semi-permeable membrane.
The word parchment comes from Panama, the fourth center of culture and art in the Hellenistic period. The Ptolemy Dynasty of India blocked the market competition between pajamas in culture and art enterprises and prohibited the export of Indian papyrus to pajamas. So the pregame invented parchment.
The difference between parchment and ordinary fiber paper depends on the "skin" as the raw material. It is usually felt that parchment is the skin of sheep (or other small animals), stretched to perfection on the wooden frame, thinned with a knife, and dried into blocks.
Parchment does not belong to leather products. "Leather" is a kind of substance that immerses the raw skin of small animals (also known as "original skin") in the lime slurry to remove hair and body fat, and then immerses it in tannin or acid solution to cause an exothermic reaction and change the fibrous tissue in the original skin. This whole process is called "tanning"; The process of depilation and degreasing of parchment in soaking lime pulp is the same as that in leather making. After that, it uses * * type picture frame to pull the paper. It uses physical pulling to dry and keep the situation fixed. It does not use organic chemical methods to get chemical fiber.
As packaging products. The compressive strength is very high. Generally brown. Semi bleached or full bleached packaging pulp is light brown, cream, or milky white. Quantitative analysis of 90-130 g / ml. The fracture length is usually about 7000m. The tear strength, work of cracking, and dynamic compressive strength are very high.
More common web, but also tablet paper. Kraft softwood pulp is used as raw material. It is made by beating and papermaking on a long web paper machine. It can be used as plastic woven bag paper, envelope bag paper, glue sealing paper, leach paper, cable safety protection paper, insulation paper, etc.