Inspection standard and production process of PVC packaging film

Inspection standard of PVC packaging film:

1. PVC packaging film manufacturers remind everyone, don't forget to look at the flatness of PVC packaging film. You can take a PVC packaging film at random to see if there are any wrinkles or signs of shrinkage.

2. When inspecting the PVC packaging film, first look at the surface of the PVC packaging film to see whether the transparency of the PVC packaging film is good, whether the color is bright, whether there is any damage, whether it is perforated, etc.

3. Then look at the outer packaging of PVC packaging film to see if there is any information on the surface, such as product name, manufacturer, date, quantity, etc., and the surface should be smooth and clean, and there should be no dust.

The transparency is good, the light transmittance reaches 80%, the product can be displayed, the product can be advertised invisibly, and the distribution errors in the logistics link are also reduced. Not afraid of water and dust, it can not only achieve packaging effect, but also beautify and protect products. Non-toxic, odorless and pollution-free packaging materials.

PVC packaging film has good flexibility, not easy to be damaged, strong explosion resistance, good impact resistance, good tear resistance and strong tensile force, which can replace box packaging. The shrinkage rate is large, and the articles can be tightly wrapped after thermal shrinkage. If the PE straight-through bag (with openings at both ends) is made after thermal shrinkage, the articles can be lifted at both ends of the opening, which can bear the weight of 15KG and is convenient to carry.

It is widely used in the outer packaging of various products, such as food, tableware, cultural and sports supplies, craft gifts, printed matter, hardware and plastic products, telephones, electronic appliances, etc. It can not only achieve the functions of dustproof, touch-proof and transparent display of goods, but also increase the attractiveness of products, and can also be used to replace various cartons, which not only saves packaging costs, but also conforms to the packaging trend.

With the increase of polycondensation reaction temperature, the polycondensation reaction time of PVC packaging film is shortened, but when the reaction temperature exceeds 282℃, the color of polymer becomes worse. But the temperature is low, the reaction time is prolonged, and the hue is not good. Based on this, it is concluded that the good reaction temperature in this study is (278 2)℃.

1. The novel copolyester is suitable for film drawing, and the optimal feeding ratio is n (HD) ∶ n (EG) = 25: 75.

2. The better catalyst for the novel copolyester is a composite catalyst such as tetrabutyl titanate.

3. In a 5L reactor, using PTA, EG and HD as raw materials, modified polyester chips with good color phase for heat shrinkable film can be synthesized.

4. The esterification temperature of the new copolyester is 235 ~ 240℃, the polycondensation temperature is (278 2)℃, and the low vacuum time is about 10min longer than that of ordinary polyester.

PVC packaging film is widely used in the packaging of wine, food, sporting goods, tableware, electronic appliances, daily necessities, handicrafts, audio-visual products, stationery, toys, doors, plastic hardware, glass ceramics and other commodities, making its appearance more vivid and beautiful, upgrading the packaging grade of products, and protecting products from dust and flowers. It is an ideal film packaging material at present.

To make PVC packaging film, the thick film should be produced by extrusion blow molding or extrusion tape casting, and then softened sufficiently at the melting temperature, and then stretched horizontally and vertically. PVC heat shrinkable packaging machine can be processed and cut at will, and is often used in molds, hydraulic presses, and other parts that need heat insulation, and can also be used for self-made roofs and other parts that need heat insulation. Save energy, reduce heating time, reduce heat conduction to equipment, and have good heat insulation effect.

PVC packaging film bag is a kind of packaging material in heat sealing packaging. Through hot air blowing, the high-transparency PVC packaging film can cling to the surface of the article, so as to improve the product grade, prevent dust and make the article show a new packaging effect. PVC packaging film packaging, the operation method is easy to learn.

In the production process, PVC packaging film is stretched in a high temperature environment and then cooled easily, and then reaches the purpose of setting. When heated again during use, it retracts to its original posture, and the heating is uneven, the shortening degree and planning are not the same.