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The basic principle of water cooling in plastic mold

Yesterday is Tanabata, is China's traditional Valentine's Day, Dongguan Plastic mold factory colleagues how do you spend this holiday, I believe most people are quietly in their own jobs on the tireless work of it So hard, the boss has not added your chicken it Well, some time ago are busy, has no time to update the site, today to introduce the basic principles of water mold cooling in plastic mold.

Thermal conduction from plastic to mold cavity wall: The behavior of the cooling system is affected by the heat removed from the plastic and the temperature transferred to the surface of the mold cavity. It will be affected by the nature of the material, the difference between the melt temperature and the mold surface temperature, and the contact between the plastic and the mold material in the cooling.

Thermal conductance from the wall of the mold cavity to the wall of the water pipe: The behavior of the cooling system is also affected by the heat transfer through the mold material to the cooling water pipe. The nature of the mold material, including the thermal conductivity, the distance between the cooling water pipe and the plastic surface, and the difference between the temperature of the plastic melt and the cooling water pipe, also affect the cooling system behavior. The closer the water pipe is to the mold cavity, the faster the heat is removed. However, placing them closer to the mold cavity creates a local change in the surface temperature of the mold cavity unless additional water pipes are added to reduce the distance between adjacent water pipes. Therefore, the optimal placement of the water pipes should be a compromise between uniform cooling and rapid cooling.

Thermal conductance from the water pipe wall to the cooling medium: The cooling system is also affected by the heat transfer from the mold material to the cooling medium, the degree of turbidity of the heat transfer through the mold material, the coolant inlet temperature, the coolant properties, and the coolant The impact of the flow rate. When the coolant is disturbed, the heat transfer from the outer wall of the water pipe to the coolant is much more effective than the laminar flow. Excessive turbulence wastes pump power and does not achieve greater heat transfer capability. When considering the cooling medium, make sure that the molding plant is capable of providing sufficient volume of coolant, reaching the required flow rate at sufficient pressure, and releasing heat at a temperature and at a desired rate.


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