/ep_edm/en/contect_993.html SHINI PLASTICS TECHNOLOGIES, INC.

Special Reports

2015 Quarter 4 Issue 25

Notice for Pipe Connection of Mould Temperature Controller and Mould

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Generally speaking, the circulating inlet and outlet of the mould temperature unit connects with the mould inlet and outlet. As a result this would form a closed circulation loop. A high temperature medium circulates in the loop to heat up and maintains constant temperature for the mould. In the process, factors of different heating temperature, demands a pipeline structure which affects the actual result of mould temperature control. Following is the explanation of the aspects of pipe connection.     

Selection of Pipeline Material

There are two kinds of materials commonly used in pipeline: the Teflon pipe and metallic flexible pipe. For pipe material, the heat-resistant issue is the main consideration. If the maximum temperature of the mould temperature controller is not more than200℃, you should choose the Teflon pipe; If the maximum temperature of mould temperature controller is more than200℃, you should choose the metal flexible pipe.  

Pipe Diameter

Pipe diameter will directly affect the demand of pump pressure. The less pipe diameter, the larger the pressure would drop when the medium passes by. Normally, pipe diameter should be a little bit larger than the indicated dimension and it needs to comply with the pump capacity.

In the actual production process, it is always required to use a quick connector for easy dismantlement. However, the quick connector would cause much of the pressure to decrease, therefore during the use of the quick connector, you need to ensure its diameter should not be smaller than the inner diameter of the mould, so is the pipe diameter.            

Length, Quantity and Heat Loss of Pipe Connection

Usually, the mould temperature controller is placed beside the molding machine, the length of the connected pipe is short, and it is suggested that the length should be within 3 meters. Length of the connected pipe has the proportional relation to the heat loss of medium running in the pipeline. The longer the pipe, the larger the temperature difference will be. It actually reached the mould core and the set temperature of mould temperature controller.

If it is in a low temperature environment, the temperature difference between the inside of the pipe and outside of the pipe is even larger. In this situation, it can use the glass-fiber cotton to wrap the pipeline for heat loss reduction or increase the machine’s working temperature to compensate the heat dissipation. Besides, the quantity of the pipe’s inlet and outlet would also affect the heat loss. The quantity of pipes increases the heat loss acceleration.    

Connector

Mould connector and pipe should be firmly connected and with leakage-proof. It is suggested to choose the male-thread mould connector, and choose the pipe with trumpet nuts (also named flare nuts) at both ends. The trumpet nut and male-thread mould connector locked up fitly, can obtain confirmation connection and make it unable to leak. Add some leakage-proof glue at the threads to strengthen the leakage-proof effect when necessary.  

Other Notices

During the pipeline connection, too much twisting of each pipe should be eliminated, and try the best to make through the twist.  

Don’t fold or flatten the pipe. Pipe bent radius should not be small, otherwise it will cause much flow and pressure loss of the heating medium. When bending, don’t make the pipe flat. 

Try your best to avoid the pipe directly rubbing against sharp objects to prevent the leakage caused by pipe damage.