Why is there an obvious trace line on both sides of the plastic water cup?

Today, editor met a studious customer who kept asking various questions about the production process of water cups.When answering the other party's question, the editor found that the trace lines on both sides of the plastic water cup were both caring and completely incomprehensible. So why is there a trace line on each side of the plastic water cup?

This trace line is called parting line with our professional production.The production of plastic water cups varies with the size of the product, and the molds are also different.However, most plastic water cup processes require that the mold to be processed needs to be composed of two parts, and the two half molds are combined to form a complete mold.

Then the gap where the two halves meet is the parting line.The more precise the mold processing, the thinner and lighter the mold closing line of the finished water cup.Therefore, the light and shade of the parting line is mainly caused by the process of the mold.

Is there a way to completely eliminate the parting line?Under the premise of using two-piece mold clamping production process, it is impossible to really eliminate the clamping line in real time.However, through the excellent workmanship of the mold and the exquisite production process, the effect of the clamping line on the finished product that the eye cannot recognize can be achieved.But if you touch it with your hands, you can still feel that there will be some line bulges in the parting line.

Is there any process, but there is no mold clamping line? This is possible.Open a complete barrel mold, so that the processed product has no parting line.But not all products are suitable for barrel molds.Therefore, it is normal for the surface of the plastic to follow the parting line, and it does not mean that the surface of the water cup is a defective product from the parting line.But when you buy a water bottle, you can get started and feel the workmanship.

Will there be a clamping line on the body of the stainless steel water cup?Basically there is no such thing.Because the production methods of stainless steel water cups and plastic water cups are completely different, even if there are some raised points or lines on the surface of stainless steel water cups, they can be corrected and smoothed by shaping and polishing processes.However, once the plastic water cup is released from the mold, these problems cannot be solved by similar shaping or polishing.

In addition to plastic water cups with mold clamping lines, what other material water cups have mold clamping lines?In this way, as long as the water cup is produced by hot-melt material and is produced by two half-mold clamping, there will be a clamping line.