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How to Design a Blister Mould


Blister molds are what we often see and use, but many people think that the design of blister molds is very simple, but do you really know how to design blister molds? Let's take a look at the issues that need to be paid attention to when designing. . 1. Mould opening direction and parting line At the beginning of the design of each blister product, the mold opening direction and parting line must be determined first to ensure that the core-pulling slider mechanism is minimized and the impact of the parting line on the appearance is eliminated. 2. Demoulding slope 1. Appropriate demoulding angle can avoid product fluffing (drawing). The demoulding slope of the smooth surface should be greater than or equal to 0.5 degrees, the fine skin (sand surface) surface should be greater than 1 degree, and the rough skin surface should be greater than 1.5 degrees. 2. Appropriate demoulding slope can avoid damage to the top of the product, such as top white, top deformation, and top fracture. 3. When designing deep cavity products, the slope of the outer surface should be larger than the slope of the inner surface as much as possible to ensure that the mold core does not deviate during blistering, obtain a uniform product wall thickness, and ensure the material strength of the product opening. 3. Product wall thickness 1. Various plastics have a certain range of wall thickness, generally 0.5 to 4 mm. When the wall thickness exceeds 4mm, it will cause problems such as long cooling time and shrinkage, and should consider changing the product structure. 2. Uneven wall thickness will cause surface shrinkage. 3. Uneven wall thickness will cause pores and weld marks. 4. Reinforcing ribs 1. The rational application of reinforcing ribs can increase the rigidity of the product and reduce the deformation. 2. The thickness of the reinforcing rib must be ≤(0.5~0.7)T product wall thickness, otherwise it will cause surface shrinkage. 3. The unilateral slope of the reinforcing rib should be greater than 1.5° to avoid damage to the top. Blister molds are what we often see and use, but many people think that the design of blister molds is very simple, but do you really know how to design blister molds? Let's take a look at the issues that need to be paid attention to when designing. . 1. Mould opening direction and parting line At the beginning of the design of each blister product, the mold opening direction and parting line must be determined first to ensure that the core-pulling slider mechanism is minimized and the impact of the parting line on the appearance is eliminated. 2. Demoulding slope 1. Appropriate demoulding angle can avoid product fluffing (drawing). The demoulding slope of the smooth surface should be greater than or equal to 0.5 degrees, the fine skin (sand surface) surface should be greater than 1 degree, and the rough skin surface should be greater than 1.5 degrees. 2. Appropriate demoulding slope can avoid damage to the top of the product, such as top white, top deformation, and top fracture. 3. When designing deep cavity products, the slope of the outer surface should be larger than the slope of the inner surface as much as possible to ensure that the mold core does not deviate during blistering, obtain a uniform product wall thickness, and ensure the material strength of the product opening. 3. Product wall thickness 1. Various plastics have a certain range of wall thickness, generally 0.5 to 4 mm. When the wall thickness exceeds 4mm, it will cause problems such as long cooling time and shrinkage, and should consider changing the product structure. 2. Uneven wall thickness will cause surface shrinkage. 3. Uneven wall thickness will cause pores and weld marks. 4. Reinforcing ribs 1. The rational application of reinforcing ribs can increase the rigidity of the product and reduce the deformation. 2. The thickness of the reinforcing rib must be ≤(0.5~0.7)T product wall thickness, otherwise it will cause surface shrinkage. 3. The unilateral slope of the reinforcing rib should be greater than 1.5° to avoid damage to the top.


2022-01-25

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How to properly maintain rubber molds


Everything has a certain lifespan. In order to prolong the service life, we must know the correct maintenance method. The following is the correct maintenance method for rubber molds. First, the mold wear curve of regular maintenance is present in each mold. Die maintenance is to achieve abnormal wear in the field, and the number of stamping processes during this time is easy to learn. When the processing quantity is satisfied, the mold maintenance is realized, and the maintenance plan is not only easy to learn the maintenance items, but also easy to control the maintenance time. Second, improved maintenance In order to prolong the life of the mold, stabilize the quality, and facilitate maintenance, some improved molds are specially maintained. Third, daily maintenance refers to normal rubber mold cleaning, inspection, and oil removal. This work is usually to confirm that the mold is in a normal state, and abnormalities can be detected early. Fourth, there will be some changes in the processing of rubber molds repaired in accident status, and the country cannot continue to use them. Such as burrs become larger, wrong size, such as scars, burning of mold parts. Because of similar abnormality, the content of mold repair and maintenance is called accident. This maintenance is usually used until the near limit, if the time of the rubber mold maintenance cost is more important, the life of the mold is short. Because this is a sudden maintenance, there must be a planned shutdown of equipment, and emergency repairs.


2022-01-25

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Two indicators of the development of my country's plastic mold industry


The development of mold standard parts is of great significance to shorten the mold design and manufacturing cycle, reduce mold production costs, and improve mold quality. If the professional production and commercial supply of mold standard parts can be realized, it will greatly promote the development of my country's mold industry. developing. The plastic mold industry has developed rapidly in my country in recent years, followed by increasingly fierce market competition. After joining the WTO, foreign mold manufacturers have entered the domestic market. They must stand out in the fierce competition, develop mold standard parts, implement mold Specialized production is essential. According to Luo Baihui, secretary general of the International Mold Association, the standardization degree of molds in foreign developed countries is 70% to 80%, while only about 30% in my country. If the mold standard parts can be widely used, the mold design and manufacturing cycle will be shortened by 25% to 40%, and the waste of man-hours caused by the user's modification of the mold parts can be reduced. The application of mold CAD/CAM technology to design molds has become more common. The promotion and use of mold standard parts can realize some resource sharing, which will greatly reduce the workload and working time of mold design. It is necessary to develop CAD/CAM technology and improve mold precision. Significance. Even if only one part is damaged, the previous mold will not be usable. Since it is not a standard part, it is difficult to have corresponding products on the market. It is time-consuming and laborious to go to the manufacturer to replace the parts. If standard parts are used, it can be easily repaired and replaced, which will greatly improve the service life of the mold. Now, domestic enterprises have realized the importance of mold standardization. At present, there are more than 100 manufacturers of mold standard parts with a certain production scale. The main products are plastic mold frames, side punch devices, push rod push tubes, etc. Larger products can be produced, which lays the foundation for the development of large-scale precision molds. Although the domestic mold industry has made great progress, there is still a big gap compared with foreign countries. Implementing the specialized production of molds is an important link to speed up the development of the industry. Many regions in my country have successively established regional mold cities, which have played a positive role in the development of the mold industry. For example, Yuyao Mould City in Ningbo, Zhejiang is the first mould city in China. There are hundreds of mould enterprises and it has promoted the development of mould industry in Yuyao and surrounding areas. Shenzhen, which has successfully implemented the specialized production of molds, has nearly 1,000 mold processing enterprises. Its mold enterprises have a strong awareness of establishing a quality assurance system, and their enthusiasm for applying for ISO9000 certification is high, and they all realize that specialized production is a passport to enter the international market. Wholly foreign-owned mold enterprises have an absolute advantage in Shenzhen, with national leading professional technical level, wide application of technology, complete mold varieties, high quality and short molding cycle. These companies can produce all kinds of molds except large-scale cover molds for automobiles, such as high-speed milling, gas-assisted injection molding, reverse engineering, hot runner technology, rapid prototyping technology, etc. Shenzhen's mold enterprises have not only achieved specialization in technology, but also in the production management of mold enterprises, more and more professional production methods with design as the leader and processing according to the process flow are adopted, which reduces the need for mold workers. Comprehensive requirements, emphasizing specialization. Despite this, the molds produced in Shenzhen can only be said to belong to the middle and upper level, and some key molds, such as the main frame molds of copiers, cameras and video cameras, still need to be imported. The implementation of standardization and specialization has promoted the development of my country's plastic mold processing industry, and will continue to provide necessary technical support for my country's plastic mold manufacturers to improve their technical level, enhance their competitiveness, and accelerate their integration into the international market.


2022-01-25

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