Cellophane is a kind of thin film made from natural fibers such as cotton pulp and wood pulp.It is transparent, non-toxic and odorless.

 

Also known as cellophane.A highly transparent and glossy regenerated cellulose film.We have flat paper and web paper.Ration 30 ~ 60g/㎡.Colorless, can also dye into various colors.The paper is soft, transparent and smooth, without holes, airtight, oil-tight and water-tight.It has a moderate stiffness.Good tensile strength, gloss and printing suitability.The production method is different from papermaking and similar to rayon.The use of high-cellulose content of refined chemical pulp or cotton short pulp as raw materials, alkali (18% sodium hydroxide), pressing, crushing and other processes to produce alkali cellulose, and then after the aging of carbon disulfide to yellow into cellulose xanthate, with sodium hydroxide solution dissolved into orange cellulose adhesive.The glue in the 20 ~ 30 ℃ temperature ripening processing, and filtered to remove impurities and removed the air bubbles, and then in a tension membrane machine consists of a long and narrow the gap in the extrusion, into sulfuric acid and sodium sulfate in the mixture of coagulation bath, form the membrane (regenerated cellulose film), then through washing, desulfurization, bleaching, desalination and plasticizing and ethylene glycol, glycerin, etc.) and other processing, finally through dry.Used for the packaging of medicine, food, cigarettes, textiles, cosmetics, precision instruments and other commodities.

 

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Cellophane tension changes, thin film in the printing process, allow in strength, elongation increased along with the increase of tension, bring difficulties to the accuracy of the color printing overprint, according to the types of substrates materials and its expansion rate is to adjust the tension, such as expansion rate is bigger, PE film tension values should be smaller;For paper or PET, OPP and other plastic film with a small expansion rate, the tension can be a little larger.Surface smooth, non-capillary stoma exists, ink layer is not easy to solid or solid is not firm, the first color after printing, easy to be overprinted by the next color of ink sticky, so that the pattern and text is incomplete, resulting in defects;

After using it to pack article, can prevent rust, moistureproof, prevent pollution.But cellophane also has disadvantages: the longitudinal strength is large, the transverse strength is small, the tear degree is poor, slightly a tear to break.

Cellophane also has hydrophilic, so it can absorb water, often occurs after water adhesion, meet heat between the pages easy to bond into a block.Cellophane is characterized by high transparency, strong gloss, printed pictures and text color is particularly bright, this is plastic film can not achieve;Good printing suitability, no need to go through any processing before printing, cellophane also has antistatic processing performance, not easy to absorb dust, avoid the occurrence of printing problems such as adhesive dust.But the moisture-proof property is poor, the film is subject to the influence of temperature, humidity easy deformation, resulting in the printing of the text and text is not easy to register.