In the whole process of ejecting and closing the mold of the bmc mold, overflow often occurs, also called overflow and overflow. For example, the parting surface of the material pipe, the gap between the inserts, and the holes of the small chain. If it is not eliminated immediately, part of the bmc mold may collapse and even cause the mold to be destroyed. In addition, if the insert gap is too large or the injection pin hole is too large, it will cause the finished product to jam the mold and endanger the whole process of mold ejection. Then why does bmc produce integrated ic overflow when it solves it? How to deal with the overflow problem? Let me introduce to you below.

First, machinery and equipment.

1. Improper adjustment of the machine clamping equipment or uneven rotation of the organization will cause the needle mold to be non-parallel, resulting in a tightly closed end of the needle mold and a tight connection at the other end, and it is very easy to overflow during the entire injection process.

2. The flatness of the equipment itself is a problem, and the uneven bearing force of the support rod will also cause the BMC mold to be unable to be tightened, resulting in overflow.

3. The damage of the stop loop is serious. The screw of the extruder is damaged too much, the injection volume in the injection cylinder is not enough, and the shock-absorbing rubber pad is too small, which may cause overflow. Therefore, the actual operation staff should immediately check and repair or replace the parts.

Second, the bmc mold.

The precision of the parting surface of the c-type mold is not high.

The moving template (such as the middle plate) deforms and shrinks, there is dirt on the parting surface, and there are protruding sliding burrs around the bmc mold base, which can cause the bmc mold to overflow.

Poor design of 2×2mm mold.

If the opening position of the bmc mold cavity is greatly deviated, the bmc mold will cause excessive unilateral support force during the entire injection process, resulting in burrs.

Plastic materials, such as high-pressure polyethylene and polypropylene, have good circulation and low viscosity in the molten state, which is easy to enter the gap of the bmc mold. Therefore, when making high-precision bmc molds, the operator should try to put the raw materials into the thick part of the bmc mold to prevent overflow and harm the consistency of the bmc mold product.

The precision of the sliding mold cores of the BMC material tube is not high, and the mounting positions of the fixed core and the concave mold are inconsistent, which will also cause overflow.

For the two-cavity bmc mold, pay attention to the effective design plan through the runner and the glue inlet when designing, otherwise it will cause uneven filling and burrs.

3. The whole process.

Under the effect of high voltage and high-speed operation, the supporting force of the mold will expand, which will cause overflow. Therefore, the operator must adjust the injection processing rate and injection processing time according to the thickness of the bmc mold product. High-speed rapid filling should be used for thin products, and low-speed filling should be used for thick products;

2. In order to better avoid bmc mold slack, some actual operators often choose to inject a large amount of molten raw materials, but this is likely to be difficult to solve, but it will cause overflow. Therefore, when we encounter such conditions, we should increase the injection time or hold time. The analysis above is the analysis of the overflow of the bmc mold. I mainly introduced the machinery and equipment, bmc mold and processing technology in detail, and I look forward to some assistance to everyone.