The blister process, as a widely used plastic molding technology, is mainly used to manufacture various plastic products with complex shapes, light weight and certain strength. This process can realize the transformation of products from two-dimensional plane to three-dimensional solid through heating and softening of thermoplastic plastic sheets on the mold and vacuum adsorption molding. It is widely used in mushrooms, vegetable and fruit tray packaging, electronic product shells, automotive parts, medical devices and other fields. Detailed introduction to the process, key equipment and technical points of the blister production process.

**I. Blister production process**

1.**Raw material preparation**

- **Material selection**: Select suitable thermoplastics according to product requirements and uses, such as PVC, PET, PP, PS degradation materials, etc.

- **Sheet cutting**: Install the raw materials of suitable mold size on the blister machine for processing.

2.**Mold design and manufacturing**

- Make blister molds according to samples or document product design drawings provided by customers. The mold material must have good heat resistance and wear resistance to ensure long-term accuracy and life. (The normal time for proofing is 3 to 5 days after the drawing is confirmed)

3.**Heating and softening**

- The plastic sheet is sent to the heating area of the vacuum forming machine and heated to a temperature suitable for forming by electric heating wire or infrared rays, usually close to but not exceeding the melting point of the plastic.

4.**Vacuum forming**

- The softened sheet is quickly moved above the mold, and the vacuum pump is started inside the mold to form a negative pressure. The sheet is formed close to the mold surface under the action of negative pressure.

- The temperature, time and vacuum degree must be controlled during the molding process to ensure the accuracy of the product shape and surface quality.

5.**Cooling and shaping**

- After molding, the mold and plastic parts are cooled immediately, usually by air cooling or water cooling, so that the plastic parts are quickly solidified and shaped to maintain their shape stability.

6.**Demolding and trimming**

- After cooling, open the mold and remove the plastic parts from the mold. If necessary, trim to remove excess edge materials or defects.

7.**Subsequent processing**

- Depending on the product requirements, subsequent processing steps such as cutting, punching, printing, and assembly may be involved.

**II. Key equipment and technical points**

1.**Blister machine**

- Core equipment, including heating system, vacuum system, mold rack and control system, etc., whose performance directly affects production efficiency and product quality.

2.**Mold technology**

- Mold design needs to consider factors such as product shape, size, material shrinkage, etc. to ensure molding accuracy.

- Surface treatment such as polishing and chrome plating can improve mold durability and demolding effect.

3.**Temperature control**

- Accurately control the temperature during heating and cooling to avoid overheating causing material degradation or insufficient cooling affecting product strength.

4.**Vacuum management**

- Appropriate vacuum is the key to obtaining clear contours and smooth surfaces, and needs to be adjusted according to material properties and mold design.

**III. Quality Control and Inspection**

- Implement a strict quality management system. From raw materials entering the warehouse to finished products leaving the factory, each process must be inspected for quality.

- Common inspection methods include appearance inspection, dimensional measurement, material performance testing, etc. to ensure that the product meets the design requirements.

Items:

1. Proofing according to customer samples or document requirements, the proofing fee includes the charge for large-scale molds (3,000 RMB for copper molds, 5,000 to 35,000 RMB for aluminum molds depending on the product) borne by the customer.

2. The mold fee will be refunded when the single payment for large-scale copper molds reaches 50,000 RMB, and the mold fee will be refunded when the single payment for large-scale aluminum molds reaches 150,000 RMB.

3. Party A and Party B confirm the samples and sign a contract to produce large-scale orders, and pay a 50% deposit in advance. 

4. The production time for large-scale goods is 35 days per 40-foot container after the mold is completed, and the delivery date will be negotiated by Party A and Party B.

**IV. Conclusion**

The blister production process plays an important role in the manufacture of plastic products due to its high efficiency, flexibility and low cost. By continuously optimizing the process flow, improving equipment performance and strengthening quality control, production efficiency can be further improved to meet the market demand for high-quality and diversified plastic products. With the continuous advancement of materials science and manufacturing technology, the application scope of the blister process will continue to expand, providing innovative solutions for more industries.