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Acrylic is also called special treated plexiglass. It is a replacement of plexiglass. The lighting made with acrylic is good in light transmission, rich in color, beautiful in appearance, and can take into account both the day and night effects, and the service life is quite long.
Acrylic sheet production methods mainly include: casting, injection molding, extrusion molding and thermoforming. Four flowers are bloomed, one for each table. The following are four different production techniques.
Casting production method
Casting method - Casting requires the use of a mold, the texture of the processed product, the shape and structural complexity are high, so the production scale is suitable for small batch production. The products produced by the casting method have high toughness and strength, and also have good decorative properties. Therefore, industries such as craft making and decoration often use casting methods. The cast product required post treatment in the treatment, after which the treatment conditions were incubated at 60 ° C for 2 hours and at 120 ° C for 2 hours.
Extrusion molding method
Polymethyl methacrylate can also be prepared by extrusion molding, using granules prepared by suspension polymerization to prepare plexiglass sheets, rods, tubes, sheets, etc., but the prepared profiles, especially the sheets, are not as good as the cast profiles. Due to the small molecular weight of the polymer, especially for pipes and other casting molds. Profiles that are difficult to manufacture. Extrusion can be carried out using a single or dual stage vented extruder with a screw length to diameter ratio of 20-25.
Squeeze to achieve large-scale, mass production methods. The reason is that the extrusion method can be fully automated, the advantage is that the processing is not flexible, and the process flow and product model are not easy to change.
Injection molding production method
Injection molding uses granular pellets which are formed on a common plunger or screw injection molding machine. Typical process conditions for injection molding: injection molding products also need to eliminate internal stress. In the treatment and processing in 70-80 ° C hot air circulation oven, the processing time depends on the thickness of the product, generally takes about 4h.
Problems in the production process
(1) Bubble problem
Acrylic production is the same as other alloys, and foam is the biggest trouble. Each process and process in the production process is designed to prevent the storage of bubbles in the body of the processed product. Once the bubble formation will cause great damage to the aesthetics and rigidity of the processed product. Moreover, acrylic products are mostly transparent and difficult to sell after the generation of bubbles, so the processing cost is greatly threatened. Regardless of the type of processing, care must be taken to clean the gas and ensure a vacuum.
(2) Transportation problems
Transportation must take certain protective measures. Whether it is a cycle between production plant equipment or road transport, certain protective measures are required. Although the toughness of plexiglass is much higher than the toughness of plexiglass, it is not too hard, and the impact resistance of PC is not good. Once the crack occurs, the entire plate will gradually break. Therefore, when transporting acrylic, a protective film and a vacuum device should be used to fix the material to prevent irreversible consequences caused by the collision.