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Vacuum Forming Products Molding Technology

Vacuum blistering process, as early as the early 20th century has been known, but applied to industrial production is only after the 20th century, 40 years of things, and in the 60's have a greater development. For nearly 20 years, it has evolved into one of the most important ways to process packaging materials. The rapid development of this technology is the vacuum blister molding process and equipment innovation, as well as the molding performance of the new sheet of development; also by the development of the packaging industry and vacuum plastic molding packaging itself, the characteristics of the decision.

Vacuum blistering is one of the most commonly used molding methods for plastic packaging containers. It is a kind of plastic sheet for the molding of the object of the secondary molding technology. In foreign countries, vacuum plastic molding is an old molding process, due to continuous development and changes, is now highly automated, mechanized, and did not produce any waste material, 100% of the raw and auxiliary materials into products. Full line production of forming systems engineering.

Vacuum blistering is different in the following conditions:

• The molding temperature required to heat the molding material to high elasticity

· Forming molds commonly used in plastic molding

• Cool the product to a cooling temperature that does not change in size

· Dimensional release of parts after dimensional stability

In most cases, post-processing of plastic molding is also necessary, such as:

• Finishing, welding, heat sealing, coating, metal spraying, flocking, and printing Vacuum blistering has now become a commonly accepted term in the field of processing: "vacuum forming". And "pressure forming" (pressure forming) (pressure forming) refers to some special use of air pressure processing process. "Thermo forming" (thermo forming) (Thermo forming) is a variety of thermoplastic molding (including vacuum and pressure, or mixed molding) in general.

First, the advantages and disadvantages of vacuum plastic molding

To determine whether any of the processing and production processes are successful, whether the cost of the article produced by the method is appropriate compared to another method of processing; or the cost of the products produced by both methods is the same, but in this way The quality of the finished product is improved. In many applications, injection molding or blow molding is in competition with vacuum blistering.

However, in terms of packaging technology, unless the use of cardboard as a packaging material, or vacuum plastic molding technology is no other processing methods can compete with. The main advantage of vacuum blistering is its engineering economy. Forming a composite sheet, a foamed sheet, and a sheet of printed matter to replace the mold in place of the changing vacuum forming machine. Walls are thin and can be molded with high melt viscosity sheets, while those with the same wall thickness require low melt viscosity. For a small amount of plastic parts, the benefits of mold cost is another advantage of vacuum forming, and for high-volume parts, products can achieve very thin wall thickness and vacuum forming machine high yield ratio is very favorable The

Vacuum Blister The smallest part that can be produced is the packaging material of the tablet or the battery used for the watch, and can also produce very large products, such as 3 ~ 5m long garden pond. The thickness of the molding material may be from 0.05 to 15 mm, and for the foamed material, the thickness may be up to 60 mm. Any kind of thermoplastic or material with similar properties can be vacuum-molded. The material used for vacuum blister molding is a sheet having a thickness of 0.05 to 15 mm, which is a semi-finished product made of pellets or powder. Therefore, compared with injection molding, vacuum plastic molding of raw materials will increase the additional cost.

In the vacuum plastic molding need to cut the sheet, which will produce scrap. The scraps are crushed and mixed with the original material to form the sheet again.