There are thick and 
                                thin wall injection products. For thick wall products, 
                                the injection speed must be slow, while for thin 
                                wall products, the injection speed must be fast. 
                                Also, the injection pressure must be low for thin 
                                wall products since it would warp the thin wall 
                                products if the internal pressure gets too high. 
                                Yet, some products require high pressure and low 
                                speed injection controlling, which is opposite 
                                to the thin wall products. To satisfy this condition, 
                                using the two set double cylinder injection system 
                                which controls high, normal, and low speed injection 
                                can solve the problem. 
                              For two set double cylinder injection system: 
                              
                                -  When using high speed injection, the injection 
                                  speed increases to above 200mm/sec. With this 
                                  high speed and low pressure injection, it can 
                                  reduce internal force and prevent warping for 
                                  thin wall products or slow flows material. 
 
                                - When using normal speed and pressure injection, 
                                  injection performance is good for general production.
 
                                - When using low speed and high pressure injection, 
                                  it is better for thick wall products, especially 
                                  for high holding pressure and long holding time 
                                  products. Thick wall products must use larger 
                                  barrel to inject in order to avoid injection 
                                  pressure gets too low and causes product shrinkage.
 
                                 
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