China is a big country in the manufacture and consumption of plastic packaging. Plastic packaging plays an irreplaceable role in various fields such as food, beverages, daily chemicals, and medical care. There are many ways to produce plastic packaging products. A large part of them are produced from plastic injection molds. In the mold industry, quality, cost, and time are the core factors that must be considered in design and manufacturing. Combining the past ten years' work experience in the mold industry, the author talks briefly about those things related to the design and manufacture of precision multicavity plastic molds.
Product lightweight design
A large part of the cost of packaging products is on raw materials. Assuming that the cost of other production factors cannot be reduced, reducing the use of raw materials can effectively save production costs. For this reason, mold companies are obliged to help customers to reduce costs by adopting Reasonable realization of production capacity and efficiency.
Taking a cap as an example, we have succeeded in reducing the weight of the 3025 cap to less than 1.8g by changing the thickness of the cap, making fine adjustments to the shape of the clip, etc., and verifying it repeatedly on the mold. 2925 bottle cap can reach 1.2g, 38mm water cap can be less than 2g.
Shorten product molding cycle
Under the basic premise of ensuring the appearance, size, and function of the product, a shorter molding cycle is always the goal of the mold factory to tirelessly pursue. The main ideas for shortening the product molding cycle are as follows:
1. According to the shape of parts and products, rationally design the arrangement of the mold waterway to ensure the uniformity of the cooling of each cavity product.
2, as close to the product shape as possible, design mold cooling water circuit (with shape cooling), if necessary, use 3D printing technology to make mold kernel, to ensure that the product fully and quickly cooled.
3. Reasonably choose mold material to ensure rapid cooling of parts. The part of the top surface of the part that is in contact with the product is usually the hot runner inlet position. The mold is designed in the form of an insert and is made of a special material to make the cooling effect better and to improve the stability of the product size.
Adjustable product thickness design
For products with a torn structure, such as flavoring caps, xylitol chewing gum lids, etc., the wall thickness at the tearing point itself is very thin, and the functional requirements are extremely high (when considering consumers tearing Touch and strength, but also to consider the sealing performance of the tear ring itself, too thin may destroy the tightness of the cap, and too thick may affect consumer experience). The output of such fast-moving consumer goods is huge, and the requirements for the life of the die are high. Generally, millions of millions or even tens of millions of die are required. The mold has inevitable natural wear during the production process, and it is necessary to maintain the tearing function of the pull ring product consistently. Therefore, we have specially developed an innovative mold design that can adapt to the injection molding plant in the production process according to the nature of the mold. Wear conditions to adjust the mold height, so as to achieve product thickness adjustment, to ensure product quality is stable and reliable.
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