Characteristics of a milky white acrylic board process, poly (methyl methacrylate) containing a polar side group, has obvious hygroscopic, water absorption of 0.3% -0.4% in general, must be dried prior to molding, drying condition is 80 ℃ -85 ℃ drying 4-5h. 2, polymethyl methacrylate having effective obvious non-Newtonian fluid characteristics in a molding processing temperature range, the melt viscosity increases with the shear rate will be significantly decreased, the melt viscosity is also very sensitive to temperature. Thus, for polymethyl methacrylate molding process, the molding pressure and temperature can increase significantly lower melt viscosity, to achieve better flowability. 3, PMMA begins to flow temperature of about 160 ℃, the decomposition start temperature of higher than 270 ℃, has a wide working temperature range. 4, Poly methyl methacrylate higher melt viscosity, cooling rate and faster products prone to stress, so the control process conditions demanding during molding, after molding products also require post-treatment. 5, polymethyl methacrylate is an amorphous polymer, the shrinkage and range are small, typically from about 0.5% to 0.8%, in favor of a higher dimensional accuracy of the molded plastic parts. 6, polymethyl methacrylate cutting performance is very good, its profile can be easily machined to dimensions of the various requirements. Processing of poly (methyl methacrylate) can be used casting, injection molding, extrusion, thermoforming and other processes. Casting molding casting molding for molding plexiglass sheets, rods and other profiles that use bulk polymerization method molding profiles. After casting the molded articles need to be processed, the processing conditions after 2h incubation at 60 ℃, at 120 ℃ incubated 2h. Injection Molding Injection Molding by suspension polymerization of the obtained pellets, molded in conventional ram or screw injection molding machine. Table 1 is a typical process conditions polymethyl methacrylate injection molding. Injection products also require post-processing to eliminate stress, processing within 70-80 ℃ hot air circulation oven, depending on the processing time of product thickness, the general need about 4h. Characteristics of a milky white acrylic plate, with crystal clarity, light transmission rate of more than 92%, soft lighting, visual clarity, with colored dyes have a very good exhibition of acrylic color effect. 2, acrylic plate having excellent weather resistance, high surface hardness and surface gloss, and good high temperature properties. 3, acrylic board has good processing properties, both thermoforming, you can also use the machining methods. 4, a transparent acrylic sheet having a light transmittance compared with the glass, but only half the density of the glass. Moreover, unlike glass so fragile, even destroy, nor formed as sharp as glass fragments. 5, acrylic on aluminum plate wear close, good stability, corrosion resistant to many chemicals. 6, acrylic plate with good printability and spray resistance, the use of appropriate technology for printing and coating, acrylic products can give the desired surface decorative effect. 7, flame resistance: not spontaneous but is flammable, do not have the self-extinguishing. Features a milky white acrylic panels, Hardness is the best embodiment of the production process and technical casting parameters acrylic panels, quality control is an important part. PMMA material hardness reflect purity, weather resistance and high temperature performance sheet and so on. Hardness directly affect whether bending sheet will shrink, the surface is cracked, etc. will appear during processing. Hardness is one of rigid acrylic panels to judge the quality of the quality indicators, the average hardness value of about 8,9 Dallow degrees. 2, the thickness (acrylic tolerance) acrylic acrylic sheet thickness tolerances exist, so the acrylic tolerance control is an important manifestation of quality control and production technology. Acrylic production has an international standard ISO7823 pouring plate tolerances: Tolerance = ± (0.4 + 0.1 x thickness) sheet extrusion tolerances: Tolerance = 3 mm Thickness: ± 5% 3, transparency / whiteness strict raw material with the election, advanced formula follow-up and modernization of the production process production, to ensure transparency and white sheet excellent degree. Flame polished crystal clear.