The two-color injection mold is also called double material injection molding, which is usually carried out by a set of stamping molds and must be a professional two-color injection molding machine. How many kinds of raw materials must be selected for the two-color injection mold, and the raw materials need to be replaced, so how to replace the raw materials for the two-color injection mold?
When the machine and equipment are shut down, the machine shall be cleaned, the material gate shall be closed, the finished products shall be discharged, the manual screw shall be reversed, and then the air shall be injected, and the screw shall be reversed and moved forward repeatedly for many times, and the high-precision two-color mold shall be used until no finished products are removed. If it is raw material with flame retardant grade, use non flame retardant grade raw material first, remove the barrel, and then clean the machine.
To change the color of the two-color injection mold, the following steps are generally required: turn off the material gate – hit repeatedly without air – remove the raw materials in the barrel – clean the silo – add white materials – use broken materials; Air injection, until the color change is carried out, or after injection into products and crushing, for the next application.
If the above methods are invalid, screw cleaning fluid or gasoline shall be used for cleaning, and the process flow is as follows:
1. Clean the silo and shoot the leftover materials;
2 The plastic of the washing machine seeps into gasoline or cleaning liquid;
3. The barrel temperature shall be less than the specific forming temperature as far as possible;
4. The screw speed ratio should be low, reducing the back pressure type to avoid the temperature rise of raw materials caused by friction heat;
5. Increase the projectile speed and injection pressure, and adjust the material quantity to 1;
6. Slightly add back pressure type to keep the melt adhesive from retreating; After the plastic color is cleaned, remember to return the temperature, pressure and material quantity to the two-color mold;
7. If the cylinder is not cleaned up under such circumstances, remove the nozzle, clean the cylinder head of the cylinder, and remove the screw if necessary.
