Cellophane paper wide usage
as cotton pulp and wood pulp, by the adhesive method. It is transparent, non-toxic and tasteless. Because air, oil, bacteria and water are not permeable to cellophane, it can be used as food packaging.
Cellophane is a film-like product processed from recycled fibers. Apply moisture-proof coating on one side or both sides of ordinary cellophane, and then make moisture-proof cellophane after drying and adjusting humidity.
Cellophane is regenerated cellulose, and there is a wonderful breathability in the gap between its molecular clusters, which can allow products to breathe like eggs through the pores on the egg skin, which is very beneficial to the preservation and preservation activity of products; Oily, alkaline and organic solvents have strong resistance; do not generate static electricity and do not self-absorb dust; because they are made of natural fibers, they can be decomposed by absorbing water in garbage, which will not cause environmental pollution. It is not fire-resistant but heat-resistant, it can not be deformed at a high temperature of 190 ℃, and can be sterilized with food in food packaging at high temperature. In addition, since the raw material of cellophane is derived from nature, it has strong decomposability
Widely used in lining paper and decorative packaging paper for commodities. Its transparency allows people to see the interior products at a glance, and it has the properties of moisture resistance, water impermeability, slight breathability, and heat sealing, which plays a good role in protecting the products. Compared with ordinary plastic film, it has the advantages of no static electricity, dustproof, and good kinking. Cellophane is available in white and color. Can be used as a semi-permeable membrane.
This is very beneficial to the preservation of commodities. .
Physical and chemical properties
The basis weight is 30～60g/㎡. Transparent+color
Dyed into various colors. The paper is soft, transparent and smooth, without holes, slightly breathable, impervious to oil and water. There is moderate stiffness. Has good tensile strength, gloss and printability.
The production method is different from papermaking and is similar to the rayon process. Using refined chemical wood pulp or cotton linters dissolving pulp with high content of α-cellulose as raw materials, alkali cellulose (18% sodium hydroxide), squeezing, crushing and other processes are used to make alkali cellulose, and then carbon disulfide is added after aging The yellowing turned into cellulose xanthate, dissolved with sodium hydroxide solution to make orange cellulose viscose. The viscose is matured at a temperature of 20-30°C, filtered to remove impurities and remove air bubbles, then extruded through a narrow slit in a film stretching machine, and flowed into the coagulation bath of a mixture of sulfuric acid and sodium sulfate To form a film (regenerated cellulose film), which is then washed, desulfurized, bleached, desalted, and plasticized (glycerin, ethylene glycol, etc.), and finally made by drying. Used in the packaging of medicines, food, cigarettes, textiles, cosmetics, precision instruments and other commodities.
After packing items with it, it can prevent rust, moisture and pollution.
However, cellophane also has shortcomings: high longitudinal strength, low transverse strength, poor tearing degree, and a small crack can be broken as soon as it is torn. Cellophane is also hydrophilic, so it can absorb moisture, and adhesion often occurs after contact with water, and it is easy to bond between paper sheets when exposed to heat.
The characteristics of cellophane are high transparency and strong gloss, and the color is extremely bright after printing graphics, which is not achieved by plastic films; the printing suitability is good, without any treatment before printing, and the cellophane also has antistatic treatment properties, which is not easy It absorbs dust to avoid the occurrence of printing failures such as sticking of graphics and text, but the moisture resistance is poor. The film is easily deformed by the influence of temperature and humidity, which makes it difficult to register the graphics when printing.