Key Word: Taili Plastic Machinery; Taili Plastic Machinery-Capacity Improving Expert; Efficient; Stable; PVC Wire Box
In the field of injection molding, there is a product that scares almost all injection molding machine factories. Its wall thickness is less than 1 mm, the material used is 6g /min rigid PVC, the injection pressure is as high as 180 bar and the clamping pressure is as high as 160 bar. All of the following condition cast a question to the injection molding manufacturers: which one do you want to break, the piston rod or the coupling?
That’s right! This product is today's protagonist - PVC wire box.
Nowadays, there are not so many injection molding machine manufacturers newly entering the PVC wire box industry. Because the thermal sensitivity of PVC is very strong, which means the fluidity of material is unable to be increased by increasing the barrel temperature, prolonging the plasticizing time or increasing the screw speed. Thus, PVC material is very easy to decompose directly at high temperature, or yellowing, which will affect the appearance and physical properties of the product.
The wall thickness of PVC wire box is generally about 1 mm. Due to its poor fluidity, if high pressure is not used at the injection site, material shortage on the product will be easily caused; if the injection pressure is increased, the clamping pressure must be correspondingly increased to ensure that the mold can be closed during the injection molding process. Under the double effect of high injection pressure and clamp pressure, the injection piston rod and coupling of injection parts bear excessive load for a long time, which make them extremely easy to fracture.

In view of these problems, we must pay attention to the following aspects in the selection of injection molding machine and process parameters:
1. Die nozzle
In the case of meeting the actual conditions, the nozzle diameter and the quality of the nozzle should be increased as much as possible so as to facilitate the entry of PVC materials and to establish the cavity pressure as soon as possible.
2. Material selection of injection piston rod and pull rod
Due to the limitation of processing technology, the steel properties of two ends are sparse and the properties of intermediate materials are dense. Special selection should be made for the pull rod material of PVC injection molding machine, and the corresponding tensile yield strength should be measured to achieve the best effect. In the heat treatment process, the requirement of tempering is particularly high.
3. Assembly accuracy
PVC special injection molding machine should avoid using linear guide instead of injection guide rod. Because the installation accuracy of linear guide rail is generally difficult to meet the requirements, which will make eccentric state easily appear and further reduce the service life of injection molding machine.
After dealing with these problems, PVC wire box will no longer be the "graveyard" of injection molding machine, but a key to open the 10 billion market.
Taili Plastic Machinery always keeps in mind that what a good injection molding machine factory should do is to help improving the capacity and boosting the profits, rather than offer the similar products the customers need. This is also what Taili Plastic Machinery keeps doing.
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