To solve the shrinkage problem, the first thing to think about is to increase the injection pressure and prolong the injection time. But if the injection speed has been adjusted very fast, it is not conducive to solve the shrinkage problem. Therefore, sometimes when the shrinkage is difficult to eliminate, it should be solved by reducing the injection speed.

Reducing the injection speed can form a large temperature difference between the melt in front and the inlet, thus conducive to the sequential solidification and shrinkage of the melt from far to near, and also conducive to the higher pressure supplement at the shrinkage level far from the nozzle, which will be of great help to the solution of the problem.

Because of the lower injection speed, the lower melt temperature in front and the slower speed, it is not easy for the injection parts to produce batch fronts. The injection pressure and time can be further increased and lengthened, which is more conducive to solving the serious shrinkage problem.

In addition, the effect will be more obvious if the last stage end filling mode with slower speed, higher pressure and longer time and the pressure holding mode with gradual slowdown and pressure will be adopted. Therefore, it is a good remedy to use this method from the later stage of the injection when the slower speed of the injection can not be used at the beginning.

However, it is worth noting that filling is too slow to solve the shrinkage problem. Because by the time the cavity is filled, the melt has been completely frozen, just as the melt temperature is too low, there is no ability to compensate for the shrinkage in the distance.

NINGBO HAIJIANG MACHINERY MANUFACTURING CO.,LTD., situated in Ningbo Yinzhou Investment & Innovation Center, coversa land of more than 50,000M2.It was established in 1992 and now employs a staff of more than 500 people. with CE and ISO9001

Haijiang Company is a hihg-tech enterprise specialized in manufacturing injection molding machine that mainly covers dozens of speci?cations with injection shot of 45-2,0000g and mold clamping force of 400-15,000KN. Based on the marrow of the trade gained and through years' accumulation, the company has made constant innovation to ensure the machine quality.Parts built into the machines of defferent mold locking forces are all processed under specialized management. HJF series injection molding machines are developed by Haijiang Company on the basis of a collection of the advantages assimilated from all world famous brand machines with optimized design realized by CAD/CAM/CAPP where technical problems such as noise of the entire machine and low energy dissipation are removed and thus the design quality of products is secured. The company adopts advanced equipment and technology and applies scientific management. Besides, it has introduced high-precision full automatic CNC machines fitted with imported electric and hydraulic parts, which have tremendously improved the accuracy and steadiness of the whole machine. Its present products such as HJK and KJF series and widely applied in the electronic, automobile and civil industries.
In order to participate in competition in the world market,the company has clustered a group of high quality technical and managerial personnel with innovative spirit by means of optimized combination fo personnel. The company faces the society and users by acting on the principle of pursuit for ?rst class and sincere service. We will appreciate friends from all circles who have given their concern and support to Haijiang machines with first class products and first class after service.