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Dongguan Yuefeng Display Products Co.,Ltd
Address: Xinxing Industrial Zone, Qiantou, Niushan, Dongcheng District, Dongguan City, Guangdong Province, 523128, China
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Acrylic Lens Processing Technology
Jun 26, 2018

Acrylic can use casting, injection molding, extrusion, thermoforming, laser engraving, laser cutting and other processes.

1, casting molding

Casting molding is used to form plexiglass sheet, bar and other profiles, that is, the body bulk polymerization method profiles. Post-processing of the molded product is required. Post-treatment conditions are 2h at 60°C and 2h at 120°C.

2, injection molding

Injection molding uses pellets obtained by suspension polymerization and is molded on an ordinary plunger or screw type injection molding machine. Table 1 shows typical process conditions for polymethyl methacrylate injection molding. Process Parameters Screw Injection Molding Machine Piston Injection Molding Machine Barrel °C Temperature Rear 180-200 180-200 Middle 190-230 Front 180-210 210-240 Nozzle Temperature °C 180-210 210-240 Mold Temperature °C 40-80 40-80 Injection pressure MPa 80-120 80-130 Pressure holding pressure MPa 40-60 40-60 Screw speed rp.m-1 20-30 Injection molding products also need post-treatment to eliminate internal stress, handled at 70-80°C hot air circulation In the drying oven, it takes about 4 hours for the thickness of the acrylic bar to be processed.

3, thermoforming

Thermoforming is a process in which a plexiglass sheet or sheet is formed into various sizes and shapes. A blank cut to a desired size is clamped on a mold frame, heated to soften it, and then pressed against the mold surface. The same shape as the profile is obtained, and the edge is trimmed after cooling to obtain the product. Pressurization can be done by vacuum drawing or by directly pressurizing a punch with a profile. Thermoforming temperature can refer to the recommended temperature range in Table 3. When adopting fast vacuum low-draft forming products, the lower limit temperature should be adopted. In the case of deep-drawing products with complex shapes, close to the upper limit temperature should be used. Under normal circumstances, normal temperature is used.

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