Cap Compression Molding Machine (36 Cavities, 50,000PCS/hour)

This machine combines extrusion, molding, rotational molding technology advantages, and the original on the multimode high speed rotary compression molding process.
Our compression machine with quantitative feeding, no pouring system, without waste material in the runner scraps and flash, forming a high rate of raw materials; raw material is heated and plasticized, small shrinkage and deformation, beautiful forming; With the continuous flow manufacturing cap, low energy consumption, production efficiency and high rate of finished products.
 
2.    Equipment datasheet

 
3.    Technological process

3.1   Quantitative feeding
The mold position on the transmission system shaft is moving by motor, drive the pneumatic scraping according to the pre-set speed simultaneously. The plasticized material with a constant weigh extrudes and rotates with the pneumatic material scrapping system. When the pellet is just on the top of the lower mold, force from the air hole blows it into the mold cavity.

3.2   Rotary type upper and lower compress molding
When main shaft of cap compression molding system continuously rotates transmitting the big upper and lower wheel of the mold plate rolling on the surface of the upper and lower cam, it drives the punching rod upper and lower mold on the mold plate moving up and down. The lower mold is pushed upward and closes with the upper mold to compress the plastic pellet for forming cap. At the same time, the rotary tray moves with high speed. Multi molds are positioned on the rotary tray rotating with the main shaft. Each mold's up and down movement is controlled by a lifting device to fulfill the cap compression action to realize continuous cap production.

3.3   Cooling molding
The material be solidified completely and form a qualified cap only under a certain molding temperature, pressure, and time. 
Too long or too short time will have bad effect on cap quality. Heat distribution and cooling rate are the most important factors when the cap is cooled close to room temperature. If uneven cooling or not timely, cap will deforms because of mate residual stress. In order to keep the precision of cap dimension, we adopt small volume cavity cooling system cooling the cap completely on time.

3.4   Pneumatic assist release
When the plastic solidification and cooling process finishes, the demolding process begins. The lower mold moves downward. Transmission fork on the upper mold moves downward causing stripper moving downward to demold the plastic cap. Airflow goes through the interspaces into the plastic cover, to make a pressure difference between the inside and outside of the cap. This pressure difference forms a little cap expansion which is helpful to the stripper demolding the cap. This cap expansion avoids damage to the cap and improves demolding efficiency.