Talking about the advantages and disadvantages of vacuum suction

The vacuum plastic molding process was already known as early as the 20th century, but its application to industrial production was still only after the 1940s, but it has only been a major development in the 1960s. In the past 20 years, it has become one of the most important methods for processing packaging materials. The reason for the rapid development of this technology is the continuous innovation of vacuum suction molding process and equipment, as well as the development of new sheet materials with forming properties; it is also determined by the development of the packaging industry and the characteristics of the vacuum suction molding packaging itself.

Vacuum molding is one of the most commonly used molding methods for plastic packaging containers. It is a secondary molding technique using a thermoplastic sheet as a molding object. In foreign countries, vacuum plastic molding is an old molding process. Due to continuous development and changes, it has been highly automated and mechanized, and it has achieved no waste material, and 100% of raw and auxiliary materials have become products. Full-line production molding system engineering.

Vacuum molding has differences in the following conditions:

· Remold temperature required to heat the molding material to high elasticity

·Forming molds commonly used in plastic molding

Cool the product to its cooling temperature without dimensional changes

·After the dimensional stability, the parts are demoulded

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

·Trimming

Welding

Bonding

·Seal

·coating

·metal spraying

·Flocking

·print

Vacuum blister molding has now become a widely accepted term in the processing industry: "vacuum forming". And "pressure forming" refers to some special processes that use air pressure processing. "Thermo forming" is a general term for various thermoplastic moldings (including vacuum and pressure, or mixed molding).

First, the advantages and disadvantages of vacuum plastic molding

To judge whether any process production process is successful, whether the cost of the products produced by the method is appropriate compared with another processing method; or the cost of the products produced by the two methods is the same, but in this way The quality of the products produced has been improved. In many applications, injection molding or blow molding competes with vacuum molding.

However, as far as packaging technology is concerned, unless the cardboard is used as a packaging material, there are no other processing methods that can compete with vacuum molding technology. The main advantage of vacuum forming is its engineering economy. Forming composite sheet, foamed sheet, and printed sheet products with appropriate changes to the mold instead of changing the vacuum molding machine. Thin-walled products can be vacuum-formed with high melt viscosity sheets, while injections of the same wall thickness require low melt viscosity pellets. For a small number of plastic parts, the advantage of mold cost is another advantage of vacuum molding, and for large batches of parts, the products can achieve very thin wall thickness and high output ratio of the vacuum suction molding machine is very favorable .

The smallest part that can be produced by vacuum-molding is the packing material for tablets or batteries for watches. It can also produce very large products, such as garden pools that are 3 to 5 meters long. The thickness of the molding material can be from 0.05 to 15 mm, and for foamed materials, the thickness can reach 60 mm. Any kind of thermoplastics or materials with similar properties can be vacuum-molded.

The material used for vacuum-molding is a sheet having a thickness of 0.05 to 15 mm. These sheets are semi-finished products made of pellets or powders. Therefore, compared to injection molding, vacuum-molded raw materials add additional cost.

The need to cut the sheet during vacuum forming will result in scrap. After pulverizing these scraps, they are mixed with the original material and can be made into sheets again.

In vacuum molding, only one surface of the sheet is in contact with the vacuum-molding mold, so only one surface is consistent with the vacuum-molding mold geometry, and the outline of the other surface of the product is drawn.

In the field of plastic processing, vacuum forming is considered to be a processing method with great potential for development. It is molded to fit all areas of plastic packaging. Vacuum molding is also a processing method that requires skilled operation and experience. Today, vacuum molding has evolved into a technically controllable and reproducible process by simulating the process and the necessary expertise.

In recent years, it has become increasingly important to recycle the scrap produced during vacuum molding. Nowadays, a process has been developed that scraps are recycled after being crushed and mixed with raw materials. Discarded plastic molded products, such as packaging materials and even engineering products, are likely to be recycled under many conditions, but some are still to be developed. The current recoveries are mainly chemical materials and energy materials. To make breakthroughs in recycling, we must work hard in the ecological and economical aspects of the processing process.

Vacuum plastic molding products have the advantages of low cost, high production efficiency, freedom of shape and color selection, corrosion resistance, light weight, and insulation performance against electricity, in stationery, toys, daily necessities, hardware and electronic products, electronic products, and foods. The packaging of cosmetics and other products has now been applied to the application of billboards, automobiles, industrial accessories, building materials, safety helmets, washing machines and liners, turnover boxes and agricultural products.

Second, vacuum plastic molding has its own limitations

Vacuum molding can only produce semi-shell products with simple structure, and the wall thickness of the products should be relatively uniform (usually slightly thinner at chamfers), and plastic products with large differences in wall thickness cannot be obtained.

· The depth of vacuum molded products is limited. In general, the depth to diameter ratio (H/D) of the container does not exceed 1.

• The molding accuracy of the parts is poor, and the relative error is generally above 1%. It is not only difficult to obtain the consistency of the configuration or size of different parts using the vacuum forming method, but also the uniformity of the wall thickness of each part of the same part is difficult to guarantee. In addition, some details of the mold during the vacuum forming process And can not be fully reflected in the product.

Shandong Linyi Yamei Blister Packing Co., Ltd. specializes in producing Linyi plastic products, located in Linyi City, Shandong Province, with convenient transportation. Over the years, the company's customers have served customers all over the world and have won praise from many parties for their high quality products and good after-sales services.
The company undertakes PVC PP PE PS OPS antistatic hair-transplantation sheet and other plastic materials. The company is equipped with international advanced automatic plastic-absorbing equipment, professional and technical personnel, and a complete management system. The products are widely used in electronic hardware and food products. , decoration, cosmetics, medicine, stationery and other product packaging. Yamei people will be happy to provide you with the perfect packaging to make your products more market competitive.
Shandong Linyi Guowei Blister Packing Co., Ltd. always takes customer satisfaction as the ultimate goal. We sincerely look forward to working together with you to create a better tomorrow!