Woven packaging coating, printing processes common troubleshooting – woven, printing – Printing Industry
With the continuous development of China's packaging industry, many in low-grade to high grade trends are towards packaging. Many products used to weave cloth packaging, such as: seed packaging, packaging of rice, fertilizer, packing and so on. The packed with woven surface printing, laminating printing are most changed so that the whole package even more dazzling images, to improve the grade. At the same time packing plant is also due to appear in a number of laminating coating failure is difficult to remove, so the product quality below standard.
HC printing network With China Package Industry continues to develop, many low-end package is to move in the upgrading can. Many products used to weave cloth packaging, such as: seed packaging, packaging of rice, fertilizer, packing and so on. The surface printing with Woven packaging, is most of the change Print Film, the whole package even more dazzling images, to improve the grade. At the same time packing plant is also due to appear in a number of laminating coating failure is difficult to remove, so the product quality below standard. Following the printing process, coating process common failure analysis and troubleshooting methods.
A printing process 1, requires the use of gravure Plastic Printing press, the first steel plant in the gravure plate-making roll, Roller, followed by the printing presses (in India) into the membrane, and then further coating laminating woven cloth.
2, printing ink can be divided into two types: one is special in Indian ink and then coating compound; the other is printed on the surface, such as: Table Indian pearl film composite coating after printing, so the table India prone to a strong degree of bad ink, and some colors fade easily, change color, easy duplication of a variety of ink. And printed in India and finished, then processing aluminum, such as: transparency in the series with India ink sheet aluminum bright colorful patterns obtained, and then coating laminating.
3, different varieties of ink used, the diluent used is also different. Composite ink thinner as benzene, lipid; surface printing ink diluent for the benzene and alcohol mixed. Two thinner can not be mixed.
2, Coating Process Coating machine should be evenly coated with the molten plastics material, the coating machine's temperature is generally about 220 , the temperature is too high can affect the physical properties, low temperature also affects the peel strength, it should own equipment to set the optimum temperature for another dual-mode exit out of coated woven substrate, then through the cooling of steel roller rapid cooling, it formed on the surface of the woven composite membrane to achieve the desired effect.
Coating material choices: one is high-density polyethylene (coating level) a kind of low-density polyethylene (coating level) and a special coating materials used in conjunction with PP, the current use of coating material model for the ethylene seven A, seven B, ethylene wider. Coating material coating the best control in about 15 grams per square meter. The use of the ratio of polyethylene and PP Compound usually 4:6, PP material that would increase become more rigid coating.
3, common faults and solutions A, laminating coating does not peel strength after
Coating laminating tape finished, the product is not a little strength, delamination separately.
Causes and troubleshooting: 1, check the sub-level film is corona treatment to meet the requirement, to determine whether the peel strength ink. In general, the composite ink printing ink, but some fail to peel strength of composite ink. At present, many ink manufacturers to address this problem specifically produced printed BOPP coated woven special ink, which will increase the peel strength of a solid.
2, delamination from the separation between the coated woven fabric and should check the corona treatment and coated woven fabric selection ratio, determine the cause and remove.
B, peel strength difference Laminating coating, the peel strength of an unsatisfactory uneven peel strength.
Causes and troubleshooting: 1, composite pressure melting and small-coated woven material between the substrate does not fit tightly, so that the peel strength decreased. Need to increase the pressure on the pressure roller, so that coating material and woven tightly to the actual gap, improve peel strength.
2, check the coating material is too thin or uneven coating result in decreased peel strength; should increase the coating thickness.
3, slightly lower temperature extrusion compound, resin plastics poor flow out from the molten resin mold I can not very well and woven composite substrate will lead to decline in peel strength.
4, coating material quality standard, or the ratio of peel strength will lead to decline unreasonable, should be adjusted extruder plasticizing the resin temperature in each part well, increasing the peel strength.
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