Plastic container mould manufacturer and supplier in China

In the field of plastic container production, the quality of the mold is crucial, which is directly related to the quality, precision and production efficiency of the final product. Therefore, understanding and following the common quality inspection standards in the industry, as well as mastering the corresponding inspection tools and technologies, are of key significance for ensuring the quality of plastic container mould.
1. Quality inspection standards
Dimensional accuracy standards
Plastic containers produced by plastic container moulds must meet strict dimensional requirements. For example, the dimensional deviations of the height, diameter, wall thickness, etc. of the container should be controlled within a very small range. For some high-precision plastic containers, such as pharmaceutical packaging or packaging containers for precision electronic components, the dimensional tolerance may be required to be within ±0.05mm. This requires precise measuring tools and strict quality control.
Surface quality standards
The surface quality of plastic container moulds directly affects the appearance of plastic containers. The surface should be smooth and flat, without obvious scratches, dents, bubbles, pitting and other defects. For transparent plastic containers, the surface finish of plastic container moulds is required to be higher to ensure that the container has good transparency and gloss. At the same time, the parting line of the plastic container mould should be as hidden as possible and not affect the overall appearance of the container.
Demolding performance standard
Good demolding performance is one of the important indicators of mold quality. The plastic container mould should be able to ensure that the plastic container is demolded smoothly after molding without problems such as sticking and pulling. This involves many aspects such as the demolding angle design, surface treatment and selection of mold materials. If the demolding performance is poor, it will not only affect the production efficiency, but also may cause damage to the container surface.
Service life standard
Plastic container moulds should have sufficient service life and be able to maintain stable performance within a certain production cycle. Generally speaking, the service life of plastic container moulds is closely related to factors such as mold materials, processing technology, use environment and maintenance. The industry usually evaluates the service life of the mold based on the number of times it is produced or the time it is used.
2. Quality inspection tools
Calipers and micrometers
Calipers and micrometers are commonly used dimensional measurement tools. They can accurately measure the length, width, height, wall thickness and other dimensional parameters of plastic container moulds. Calipers and micrometers of different precision are suitable for different measurement needs, and the general accuracy can reach 0.01mm or even higher.
Roughness meter
The roughness meter is used to measure the roughness of the surface of plastic container moulds. By moving the probe on the mold surface, the information of the surface microscopic profile can be obtained and the roughness parameters can be calculated. This is of great significance for evaluating the surface quality of molds and predicting the appearance quality of plastic containers.
Three-coordinate measuring machine
The three-coordinate measuring machine is a high-precision spatial dimension measuring device. It can perform three-dimensional measurement of molds and plastic containers, and can accurately obtain the size and geometric error information of complex shapes. For some molds and containers with high precision requirements, the three-coordinate measuring machine is an indispensable detection tool.
Optical microscope
The optical microscope is used to observe the microstructure and defects on the surface of plastic container moulds. It can be magnified dozens or even hundreds of times, helping the inspection personnel to find subtle defects such as scratches, cracks, pores, etc. on the surface, providing an intuitive basis for mold quality evaluation.
Three, quality inspection technology
Mold trial inspection
Mold trial is an important link in the mold production process. Through mold trial, the molding performance, dimensional accuracy, demolding performance, etc. of the mold can be tested. During the mold trial, it is necessary to observe the molding of the plastic container, check whether there are problems such as lack of material, flash, deformation, etc., and adjust and optimize the mold according to the actual situation.
Nondestructive testing
Nondestructive testing technology can detect the internal structure and quality of the mold without destroying the mold. For example, ultrasonic testing can detect whether there are defects such as cracks and pores inside the mold; magnetic particle testing can detect cracks on the surface and near the surface of the mold. These nondestructive testing technologies can timely detect potential quality problems of the mold and avoid failures during the production process.
Hardness testing
The hardness of the mold has an important impact on its service life and performance. Hardness testing can be carried out by equipment such as Rockwell hardness tester and Vickers hardness tester. By detecting the hardness of different parts of the mold, the heat treatment effect and wear resistance of the mold can be evaluated, providing a reference for the quality control of the mold.
In short, the quality inspection standards, tools and techniques of plastic container moulds are important guarantees to ensure the quality of molds and the production quality of plastic containers. In actual production, inspections should be carried out strictly in accordance with the standards, and inspection tools and techniques should be reasonably selected to continuously improve the level of quality inspection to meet the market demand for high-quality plastic containers.