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Vacuum Forming Vacuum Blister Forming Principle

Vacuum Forming Vacuum Blister Forming Principle

Vacuum Blister Forming The vacuum blistering process (Figure 2-1) is a thermoforming process. A method of manufacturing an open shell product using a thermoplastic sheet. Will be cut into a certain size of the plastic sheet heat softening, with the pressure on both sides of the sheet pressure or mechanical pressure, so that after deformation and paste on a specific mold profile surface, after cooling stereotypes, and trimming. Vacuum Blister Molding This molding method relies on vacuum forces to stretch the sheet. Vacuum force is easy to achieve, master and control, so simple vacuum forming is the earliest, is currently the most widely used a thermoforming method.

 Plastic moldless molding

Vacuum moldless molding process, the sheet heated to the desired temperature, placed on the clamping ring, pressing with a pressure ring, open the vacuum pump valve vacuum, through the photoelectric control vacuum valve to adjust the vacuum until the sheet reaches the Need to shape the depth so far. As the free vacuum forming method does not touch any mold surface, the workpiece surface gloss is high, without any flaws. If the plastic itself is transparent, the workpiece can have the smallest light absorption and transparency, it can be used to manufacture aircraft parts such as instrument covers and skylights. Vacuum moldless molding method in the molding process can only change the degree of elongation and shape of the workpiece, it can not shape the complex parts. In addition, the thickness of the maximum deformation zone (ie, the center of the sheet) decreases as the degree of stretching increases during the molding process, so that the actual drawing ratio (H / D) is generally less than 75%. In the use of this method for processing, the operator must have skilled skills, adjust the degree of vacuum, in order to meet the design requirements of the contour and size of the same product.

Blistering male mold (punch) and plastic mold (die) molding For vacuum forming, only one side of the heated material is in contact with the molding tool. In this way, the material with the mold surface has the same with the molding die surface contour. And the contours and dimensions of the non-contact surfaces of the molded articles are only dependent on the thickness of the material. According to the forming material and the molding die of the contact surface of the different molding process can be divided into male and female mold molding.

The main features of the product is: the same with the vacuum forming method, the mold cavity wall of the side of the higher quality, the structure is also more detailed and meticulous. The largest part of the wall thickness at the top of the male mold, and the thinnest part of the side of the male mold and the bottom of the junction area, the part is the final shape of the product side of the product often appear drawn and cooling stripes, Each part of the paste when the mold has been divided. The part of the first contact with the mold surface is first cooled by the mold, and in the subsequent process, the draft behavior is weaker than the non-cooled parts. This stripes are usually at the top of the top of the mold face.

Vacuum forming method and the mold cavity wall of the surface of a higher quality, the structure is also more detailed and detailed, the largest wall thickness of the bottom of the cavity, the thinnest part of the cavity in the side and bottom of the junction, and As the cavity depth increases, the wall at the bottom corner of the product becomes thinner. Therefore, the vacuum forming process is not suitable for the production of large depth of the product.