Plastic cup mold manufacturer and supplier in China

As a common item in daily life, the production of plastic cups cannot be separated from precision mold technology and strict quality control. As a key tool for plastic parts forming, the design and manufacturing accuracy of the mold directly affect the appearance, performance and production efficiency of the plastic cup. This paper will deeply discuss the molding technology and quality control method of plastic cup mould, in order to reveal the secret of efficient and high quality production of plastic products.

Molding technology of plastic cup mould
Injection molding technology
Injection molding is common way to produce plastic cups, which involves injecting molten plastic into a pre-designed mold cavity. After the plastic has cooled and solidified, the mold is opened to remove the finished product. Injection molding has the characteristics of fast production speed, short molding cycle, mass production, etc., which is very suitable for the manufacture of standardized products such as plastic cups.

Mold design: plastic cup mould design needs to consider material flow, cooling system layout, demoulding slope and other factors to ensure that the product is flawless and easy to demoulding. The plastic cup mould is usually composed of two parts: a moving mold and a fixed mold. The moving mold is provided with a gate system, and the fixed mold includes a cavity and a cooling channel.

Temperature control: Accurate temperature control is the key to ensure the quality of plastic cup moulding. The plastic cup mould needs to be equipped with an efficient cooling system to ensure rapid and uniform cooling of the plastic and avoid problems such as deformation and internal stress caused by uneven cooling.

Injection parameter adjustment: including injection pressure, speed, time and temperature, etc., the optimization of these parameters directly affects the density, strength and appearance of the plastic cup.

Blow molding technology
For plastic cups with high strength and wall thickness requirements, blow molding is a preferred solution. In this technology, the tubular billet obtained by extrusion or injection molding is placed in the mold, and then compressed air is blown into the billet to expand and cool and harden against the mold wall.

Preform preparation: According to the size and wall thickness requirements of the plastic cup, choose the appropriate extrusion or injection molding equipment to prepare the preform.

Mold design: Blow plastic cup mould is usually divided into two or more pieces, easy to open and close and take out the product. The surface finish of the die directly affects the appearance quality of the finished product.

Blowing control: The precise control of blowing pressure and time is the key to ensure the uniform expansion of the plastic cup and the consistent wall thickness.

Quality control method of plastic cup mould
plastic cup mould materials and processing accuracy
Different from the ordinary cup silicone mold，choose high-quality plastic cup mould steel, such as P20, 718H, etc., these materials have good wear resistance and toughness, and can ensure the service life and molding accuracy of plastic cup moulds. The machining accuracy of the mold directly affects the dimensional accuracy and surface quality of the plastic cup. Advanced processes such as CNC machining and EDM are used to ensure the high precision of the mold.

Model flow analysis and test model verification
In the early stage of plastic cup mould design, CAE software is used to analyze mold flow, predict melt flow path, filling mode, cooling process, etc., and timely adjust mold design to optimize molding effect. In the mold trial stage, the actual performance of the mold is checked by producing samples in small batches, and the problems found are corrected until the expected production standard is reached.

Quality inspection and monitoring
Size detection: Use coordinate measuring machine (CMM), projector and other equipment to accurately measure the size of the plastic cup to ensure that the product meets the design specifications.

Appearance inspection: Manual visual inspection is combined with automated vision system to check whether there are scratches, dents, color differences and other problems on the surface of the product.

Performance test: temperature resistance, pressure resistance, sealing and other tests to ensure that the plastic cup meets the requirements of use.

Care and maintenance
Regular cleaning, lubrication and wear inspection of the mold, timely repair or replacement of damaged parts, and maintaining good working condition of the mold are important links to ensure the continuous production of high-quality plastic cups.

In summary, the molding technology and quality control of plastic cup moulds is a whole-process management involving design, manufacturing, commissioning, production and post-maintenance. Through fine mold design, strict process control and effective quality testing means, we can ensure the high-quality and efficient production of plastic cups to meet the market's demand for product diversification and high performance.