The working principle and common problems of positive and negative pressure vacuum blister machine---Hunan vacuum blister machine

The working principle and common problems of positive and negative pressure vacuum blister machine---Hunan vacuum blister machine

With the rise of custom home furnishings, PVC blister film pressure series are getting stronger and stronger in this custom wind. PVC film pressure technology is very important in the home furnishing industry, especially in the production of door panels and cabinets. Medium and high density substrates are processed into a variety of Linear, and then blister with various matte, high-gloss, single-color, wood-grain, and skin-like PVC films, making the products colorful and dazzling, creating a lot of room for consumers to choose. However, using this technology The quality of the manufactured products is uneven. The reasons for these differences are not only the base material and the PVC blister film itself, but also the control of the process parameters during the processing. ---Hunan Vacuum Forming Machine

Working principle of positive and negative pressure vacuum blister machine

Using the plasticity of the PVC film, through the adjustment and control of the film pressure time, the temperature in the equipment cavity and the air pressure, the PVC film is heated and pressurized, and the PVC is coated on the surface of the workpiece. The working process is as follows:

Put the workpiece on the workbench, the workbench directly enters under the heating plate, the heating plate and the workbench are closed, the air between the heating plate and the silica gel film is drawn out, the silica gel film is adsorbed on the heating plate and heated, after the set time , Inject compressed air between the heating plate and the silicone film, the silicone film and the PVC blister film are in close contact, the workpiece and the PVC blister film are heated, and the PVC blister film is softened, and the temperature of the edge of the board reaches the activation temperature of the glue . ---Hunan Vacuum Forming Machine

The air between the worktable and the PVC blister film is quickly drawn out to form a vacuum, and then compressed air is injected between the PVC blister film and the heating plate, and the PVC film is covered on the board under the action of the set pressure and temperature. on.

The main reasons for common quality problems of positive and negative pressure vacuum blister machines

Wrinkles

1.The distance between long and narrow workpieces is too small;

2. The edges and corners around the upper surface of the backing plate are not chamfered;

3. The horizontal and vertical spacing of the workpiece is not in a straight line, which increases the resistance of the air flow;

4. The set temperature is too high;

5. The time to reach the set pressure is too long.

Pull white

1. The set temperature is too high;

2. The time to reach the set pressure is too long;

3. The line type is inappropriate.

The edges are not sticky

1. The quality of the glue is not good;

2. The activation temperature of the glue is too high;

3. The equipment temperature cannot reach the activation temperature required by the edge of the workpiece;

4. The workpiece backing plate is not suitable;

5. The performance of PVC adhesive is not good or there is no adhesive;

6. The glue has expired or the storage does not meet the requirements;

7. Leaking glue or improper glue spraying method.

The parameters provided above are all based on relevant knowledge and operating experience. Due to differences in regions, equipment, working conditions, and materials, further tests are required and process records are made at the same time to obtain process parameters that meet quality requirements, and finally form process standards It is for the operators to observe. Although it is not convenient to directly inspect the bonding strength of the PVC film and the substrate after the PVC film is pressed, if the operation is carried out in strict accordance with the process standards suitable for the company's production environment, the final product can fully meet the quality requirements. This is also a process control method Is important. ---Hunan Vacuum Forming Machine