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xiuumin

The temperature of the Dustbin Mould(FURNITUREMOULD) directly affects the moulding quality and production efficiency of products, so the dustbin mould needs to increase the heating system to reach the required temperature.

The heating system is divided into electric heating, steam heating and oil heating. Electric heating is the most commonly used heating method. Its advantages are simple and compact equipment, less investment, convenient installation, maintenance and use, easy temperature adjustment and easy automatic control. Steam heating has fast heating speed, relatively uniform temperature, but it is not easy to control, and relatively high electric heating cost. Oil is heated, the temperature is uniform and stable, and the heating speed is fast, but the working environment is polluted.

The heating method for the dustbin mould can be determined according to the existing conditions of each company, the size of the mould and the complexity of the mould cavity.

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xiuumin

A good Dustbin Mould(FURNITUREMOULD) designer began to use UG to design a dustbin mould instead of taking a product. After obtaining the product, he considered injection moulding and processing. After these ideas were established, injection moulding began again. Die design is a process, the result we want is that the product can be put into production quickly. Here we will explain the design concept of the dustbin mould from many aspects.

1. Number of holes and layout of dustbin mould

All specifications of the moulding machine must be considered, and then the general situation shall be determined. In the few occasions where the number of moulded products produced and the precision of moulded products are high, one hole or 2-4 hole mould shall be used. On the other hand, most types of cavities and cavity groups are used in situations where mass production and lower cost are required.

2. The dustbin mould determines the line, runner and gate of the mould

Thus, the basic structure of the mould is determined, and the moulded product is discarded from the extrusion position, thereby also determining the appearance and manufacturing time of the moulded product.

3. The dustbin mould processing sag and determine the demoulding method

When the moulded product has a low sag, first determine which method to use. After moulding is completed, take out from the mould, e.g. sub-mould, side core mould and screw out the mould structure. Ejection mechanism generally adopts the structure of ejector pin and sleeve ejector, but if there is no ejector pin trace on the moulded product, scraper method is used for residual occasions and meat thick occasions, or box-shaped and cup-shaped objects. In addition, if the moulded product is polyethylene resin, an air blowing method will be used.

4. Determination of injection mould cavity and heart-shaped material and its processing method

According to the hardness and processing method of the mould material, it is decided to adopt the press-in method, embedding method, etc. In addition, in this case, it is necessary to determine the entry and press-in positions or press-in directions.

5. Decision on temperature control method of trash container mould

After injection moulding, the mould temperature must be controlled to adapt to the cooling of moulded products. For this purpose, water, coolant, air, etc. Can be used to enter the mould, which determines the cooling method to be used.

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xiuumin

The Dustbin Mould(FURNITUREMOULD) company and its development needs and foreign advanced standards mainly involve six aspects.

(1) The development is uneven and the overall level of products is low. Although the individual companies of the products have reached a high level, the individual business units of the products have reached or are close to international standards, but in general, the accuracy of the dustbin mould, cavity surface roughness, production cycle, life and other indicators and abroad The advanced level still has a large difference in comparison. Including production methods and enterprise management, there is a gap of more than 10 years compared with the overall level of foreign industrialized countries.

(2) The technical equipment is backward and the organization and coordination ability is strong. Although the department has been technologically advanced in recent years, the level of technology and equipment has been relatively advanced, but the technical equipment of most enterprises is still relatively backward. What's more important is that our company's organizational coordination is poor, so it is difficult to integrate or mobilize social resources, so it is difficult to undertake large-scale projects.

(3) The development capability of the majority of enterprises. One is the low proportion of technicians, the level is not high enough, on the other hand, the R&D investment is small, and more importantly, the idea behind it is not enough to pay attention to development.

(4) Administrative lag is behind backward technology. Backward technology is often easy to see, and administrative lags are sometimes difficult to achieve. The gap between enterprise management at home and abroad is very significant, and the subject of governance gap is often more serious than the technology gap.

(5) Market demand, production is difficult to keep up with the development of contradiction between supply and demand, but it is difficult to solve, the situation of short supply will continue for a period of time, especially for high-end products, the contradiction is more prominent.

(6) It takes time to solve the system and talent problems. In the socialist market economy, in the process of economic globalization, industrial competition, especially as a dustbin mould that relies on specific users, is being produced in the industry, and many enterprises' current systems and operating mechanisms are still difficult to adapt to changing the market. . The quantity and quality of talents cannot keep up with the rapid development of the industry. Although efforts are being made to solve these two problems everywhere, it still takes time to get a better solution.

Looking into the future, due to the international and domestic macro environment, the main users of the domestic dustbin mould industry will continue to develop at a relatively fast speed, and the dustbin mould will continue to develop at a high speed. At present, the main problems of exchanges and cooperation at home and abroad will be gradually solved through the joint efforts of all industries and through the joint support of all parties.

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xiuumin

The main reasons for production shrinkage are as follows:

1. Thermal expansion and shrinkage of plastics. In the material handling of the box forming, the molten plastic raw material is required. At this time, the melting temperature is 200-300 degrees, the plastic raw material is thermally expanded, and the Crate Mould(FURNITUREMOULD) is cooled during the material processing, and the temperature is lowered, and the quantity thereof will inevitably occur.

2. Changes in chemical structure. Since the thermosetting plastic transforms from a linear structure to a shape structure during the moulding process, the mass and size of the volume structure are larger than the mass of the linear structure volume, and the total volume thereof is small, thereby causing shrinkage.

3. Changes in residual stress. When a crate mould is formed, it is affected by shear forces under forming pressure, anisotropy, additive non-uniformity, and mould temperature.

After the material is processed, the residual stress will gradually become smaller and redistributed in the presence of residual stress. As a result, the crate mould shrinks, which is generally called shrinkage.

4. Door section size. Different moulds have different cross-sectional dimensions. Large gates help increase the pressure in the mould cavity and extend the gate closure time so that more melt can flow into the mould cavity.

As a result, the density of the plastic part is also large, so the shrinkage rate is lowered, and conversely, the shrinkage rate is increased.

5. Plastic varieties. In general, crystalline plastics, such as PP and PA, have greater shrinkage and wider shrinkage than crystalline plastics such as PC, PS, and ABS.

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xiuumin

The digital design and manufacture of Crate Mould(FURNITUREMOULD) and enterprise information management technology are internationally recognized as effective technical means to improve the overall level of crate mould industry, which can greatly improve the production efficiency and product quality of crate mould and enhance the comprehensive level of enterprises and interests. . The high-tech content represented by large, precise and complex crate mould is currently imported in large quantities, and imported crate mould account for about 50% of the domestic high-end crate mould market. Compared with the international advanced level, this high-tech crate mould has a gap of 5-10 years. Gap is mainly used for precision, manufacturing cycle and service life, stability and reliability. The backward design and manufacture of crate is one of the most important reasons for the backwardness of digital technology.

Although the technology has been applied to different degrees in China, high-end software is mainly imported, and its domestic development capability is weak, and its application level is low. According to reports, the main key technologies included in the technology are: crate mould optimization design and CAD / CAM / CAE integration technology, especially 3D design and computer simulation analysis technology, crate mould modularization, integration, collaborative design technology ERP, PDM, PLM, MES and other information management technologies for crate and mould companies; rapid prototyping and rapid prototyping; establishment of virtual network technology and public service platforms. Through the breakthrough of these key technologies, we can greatly improve the independent innovation capability and market competitiveness of crate mould enterprises, improve the high-tech content of crate mould to meet the domestic market rate, and export a large number, thereby improving the overall level of China's crate mould industry And business benefits.

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xiuumin

In injection moulding, short fills, air burns, high internal stresses, flow marks and weld lines are often seen. To solve these problems, the first thing to consider is the process setup, and the gate design also plays a very important role. Once these two problems are solved, the possible problem may be that the Dustbin Mould(FURNITUREMOULD) is trapped in the air. The main solution is to engrave the groove around the cavity.

The role of the ventilation trough: First, when injecting molten plastic, it can discharge air through the slots in the plastic mould, the second is to discharge the air generated when heating the plastic material.

The thinner the product wall, the farther the ventilation slots should be from the gate area. Ventilation slots are especially important for the formation of thin-walled plastic parts. In addition to avoiding short-circuit fills and surface burns, many defects and contamination of plastic moulds can be eliminated.

So, what is the inflation and ventilation of the dustbin mould? Generally, the maximum velocity melt injection does not leave a flash point on the surface; it can be considered a sufficient vent.

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xiuumin

A technique that has been instrumental in assessing the manner in which Dustbin Mould(FURNITUREMOULD) are filled is to deliberately produce short molded articles. After setting the appropriate fill rate and checking the gate size and all temperatures and pressures, create a series of short molded parts and adjust the feed control to provide different levels of a short circuit. As the test progresses, the study of the molded article will accurately indicate how the material flows, for example, whether additional ventilation is required to produce a complete molded article.

If the dustbin mould filling calculation is correct and the machine conditions are set accordingly, the temperature of the dustbin mould has little difference to the mold filling and the manufacture of the short molded article, except in special cases. An example of such a situation involves molding a sheath over a solenoid that is glass filled nylon. In this case, the dustbin mould needs to be molded between 80 and 90 ° C to complete the jacket.

The draft angle of the mold that makes the dustbin mould scratch-free depends on the shape of the part and material. For polypropylene, it can be used satisfactorily as long as 0-5°, and sometimes no draft angle is allowed at all. For materials such as ABS and acrylics, a more generous draught is required. Even if the draft angle is sufficient, if the dustbin mould has been polished at right angles to the opening direction of the mold, there may be some difficulty in extracting the molded article without causing scratches.

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xiuumin

There are many reasons for short-term molding, and it is sometimes difficult to diagnose. For example, a flash mold is very easy and still allows for a short molding. Based on the same properties, the melt viscosity of the material is too low, which may be the cause of flashing, and also ensures that the Dustbin Mould(FURNITUREMOULD) is easily filled, and a combination of the two defects should not be possible.

The failure of the dustbin mould filling is caused by a combination of factors, the most important of which is that the dustbin mould accumulates back pressure in the mold before it is completely filled. One of the reasons for this back pressure buildup is air or gas in the mold.

Therefore, if the vent is completely blocked, the short molded article may develop into a scorch-marked moulded article. This may be the result of a drop in the dustbin mould, which requires careful “running” like a new car, or grease or dirt entering the vent. In this case, it should always be remembered that the steel constructed by the mould is elastic and, under high pressure during the locking process, it can be compressed considerably; in fact, it is sufficient to fill a small ventilation gap.

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xiuumin

The first material entering the Dustbin Mould(FURNITUREMOULD) is subjected to very little pressure as it flows into the dustbin mold channel, but as it advances toward the end of the dustbin mould, it gradually cools. The following materials are hotter, starting to pressurize the already existing material, but when the dustbin mould has been filled, a layer of solid plastic is formed on each wall, which reduces the gap through which the material passes, thereby increasing the shear rate.

Additional shear stress results in the orientation of the molecular structure, and the melt is typically too viscous to release all of the generated stress. The result is that the shrinkage of the material becomes larger in the flow and orientation directions, that is, in the radial direction, in the circumferential direction compared to the direction at right angles thereto.

Controlling the temperature of the dustbin mould does not completely prevent the above-mentioned series of events, but it can help balance the effect. Cooling to a maximum when the material enters the dustbin mould can reduce the time required for cooling. In turn, the area reduces solids. The degree of crystallinity in the material reduces the size of the crystal.

This reduces the amount of shrinkage after the dustbin mould. Since the coolant is at a slightly higher temperature, the circumference of the bin mold is cooled more slowly, with the opposite effect. There is also a slight annealing effect that allows a little molecular relaxation to mitigate some of the effects of orientation. Therefore, for best results, all cooling devices should ensure that the maximum cooling effect is closest to the point of entry into the dustbin mould. Thereafter, the cooling effect should be carried out as much as possible on the entire dustbin mould, although for large mouldings it may be necessary to have two, or even three or more, cooling systems, each operating at different temperatures.

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xiuumin

If the temperature of the Dustbin Mould(FURNITUREMOULD) is not properly controlled, a portion of the mold can be run at a higher temperature. If the difference is greater than 10 °F (5.5 °C), there is a possibility of a change in thermal expansion that causes expansion and wear. After the bins have completed a specific number of production cycles (varied with product type and molding material), they must be cleaned to remove residues formed during the molding process.

The cavity surface and the venting area will show the maximum amount of residue, but the ejector housing, ejector pin, and runner block are other areas where the residue is also collected. As the dustbin mould maintain tight tolerances, the build-up of such residues may become sufficient to prevent the mold from properly closing and/or forcing certain dimensions out of tolerance. Especially need to pay attention to the ventilation area.

If the vents are clogged (due to residue), they will become ineffective and require a higher injection pressure to fill the dustbin mould. This can cause flicker and cause mold damage. When the mold is pulled out of the molding machine, it should be thoroughly cleaned, inspected and coated (mainly inside, but outside) with anti-rust materials to minimize the possibility of rust. For long-term (over 30 days) storage, the coating should be particularly heavy.

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xiuumin

Defects visible on the surface of the injection molded article include dark spots, gloss differences or fogging areas, and surface wrinkles. Usually, these defects occur near the gate of the gate region or behind the sharp corners. Starting with the two aspects of the Dustbin Mould(FURNITUREMOULD) and the dustbin construction process, we can identify the cause of these defects.

Black spots appear near the door, such as dim smudges. Of particular note is the production of high viscosity, low flow materials such as PC, PMMA or ABS. This visible defect may occur on the surface of the product when the cooled surface layer resin is carried away by the centrally flowing resin.

It is generally believed that such defects often occur during the filling and packing stages. In fact, black spots appear near the door and usually occur at the beginning of the injection cycle. Tests have shown that the occurrence of surface slip is actually due to the injection speed, more precisely the flow rate at the front end of the melt stream.

The dark spots around the gate and the dark spots after the sharp corners are formed because the initial injection speed is too high for the cooling surface to be displaced by the internal fluid. Gradually increasing the injection speed and step injection can overcome this drawback.

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xiuumin

There is a question when you find the manufacturer of the trash can mold for the Dustbin Mould(FURNITUREMOULD). We must see that injection molds are the basic tools for manufacturing quality products, so we provide tips on the quality of the bucket molds as our manufacturing experience for decades.

Why list product designs? It seems to be independent before the mold is manufactured. But it plays a key role in the manufacture of injection molds. If you or the supplier does not pay attention to it, the problem will occur until the mold stops working.

For a 20L dustbin mould, we should check its basic function and any special requirements, then we get a barrel design and check it through mold flow analysis and continuous improvement to ensure the best injection molding process.

When the product design is very good, the mold design experience will make a fantastic mold design important. It should be focused not only on the bucket forming structure, but also on the production capacity, mold life and ease of maintenance.

As one of our 20L dustbin mould, as a high speed operation, we chose DIN1.2738 with the main components of the cube insert, valve gate system and well-designed cooling system to achieve the fastest and most stable operating speed conditions.

These two steps can be seen as a very important process for making quality bin molds, so when you want to check the quality of the mold, discuss this with your supplier and you can see how it will be.

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