The key technology of plastic plate casting process

Plastic plate casting process key process plastic sign key casting & rarr; Die casting & rarr; In die casting technology, thermosetting ABS resin material to join & rarr; Single cavity, which is often called a trough and then forced into one or more closed modules in the aggregated ( Curing) 。 Feeding & rarr; Also called the sprue and runner, make plastic flow from a trough to cavity, before entering the cavity through the current limiter or gate. A lot of cavity with single & rarr; A trough. Material cavity is in the air in the plastic displacement, and through & rarr; Special place of vent discharge. When plastic into a trough, measured quantificationally in a compact measuring device, and preheat to nearly the temperature of the polymerization. Add enough one time injection quantity. Preheating of the raw materials will be sent to the discharge chute feed force to be sent to another note, the note immediately put the case on the chute, to prevent from the gaps between the piston and chute side leakage. Usually will seal the collection into the injection device to further prevent leakage. Feed chute, injection, sprue, runner and cavity surface to maintain can make raw materials rapidly solidified a certain temperature, according to the material properties, mold design and the geometry of the temperature is 280 ~ 380 parts & deg; F。 In plastic plate die casting reaches the end of the curing period, the ejection time complete die-casting plastic signs, including removal gate, runner and sprue and formed in the discharge chute curing material pad ( Also known as the residual material) 。 In sign die-casting, plastic preheating is important. Cold feed flow is slow, first into the cavity of the material has not been to the end, that may be aggregation. In case of the above, the poor quality of the products, is not only appearance, also reflected in the mechanical properties. Some exceptions, such as injection quantity are very few, or some low viscosity materials. Heating lamp or stove heating, but effective and commonly used method is to use made specifically for plastic molding dielectric heater, are now commonly used thermosetting material plasticizing heating screw type. This equipment can be combined with molding equipment, also can be independent, with reduced size and feed rate of the determination of the advantages of accurate, in other systems must be combined with preforming. The types of die casting & other; The whole chute die casting & throughout; The word is used, first because the chute and note material rod as the mould do together as a whole. The most commonly used is the circular chute, may also use other shapes to adapt the demand of special gate, in order to produce less waste. A simple compression type compressor can be used together with die casting machine. The whole chute is a trough in the middle of the frame of three board type; Feeding on rod is installed on the top of the frame, the cavity at the bottom. Area of chute was at least than combined mold area in the cavity section ( The level of the contact with the plastic material) 10% larger. This can prevent redundant mold material overflow caused by clamping force. Material after curing, by moving the knockout pin pressure will mould parts, plastic tag but still waste and the scrap by by one or more of the molding & other; Dove tail & throughout; Keep the note bar at the bottom of the material. Using wooden or soft hammer to remove waste and die.