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Jug Mould
The plastic can be pure resin or a mixture with various additives. The resin acts as a binder. The purpose of adding additives is to improve the physical and mechanical properties of pure resin, improve processing performance or to save resin.
Therefore, the most basic Plastic medical mould physical and chemical properties of plastics are determined by the properties of the resin. Resin can be divided into natural resin and artificial resin, the latter is also called synthetic resin.
Resins are all polymers, these polymers have unique molecular internal structure and molecular external structure. The internal structure of the polymer determines the most basic physical and chemical properties of the polymer; the external structure of the polymer determines the processing and physical mechanical properties of the polymer.
Polymers can be divided into non-crystalline (amorphous), semi-crystalline and crystalline according to the structural morphology between the chains after solidification. Therefore, plastics are also divided into amorphous and crystalline types.
When the crystalline plastic is solidified, there is a process of nucleation to crystal grain formation, forming a certain body state. Such as PE, PP, PA, POM, etc. are all crystalline.
When amorphous plastics solidify, the growth process without crystal nuclei and crystal grains is just the "freezing" of free macromolecular chains such as PS, PVC, PMMA, PC, etc.
According to the reflection of its plastics on heat, it can be divided into two types: thermoplastics and thermosetting plastics: Thermoplastics are characterized by being softened by heating and returning to solid state when cooled. This reversible process can be repeated many times. Such as: PS, PVC, PA, PP, POM, etc.; while thermosetting plastics are characterized by being transformed into plastic melts at a certain temperature, but if you continue to increase the temperature and extend the heating time, the inside of the polymer will undergo cross-linking and solidify. It can no longer be softened to the original state by heating, and can not be processed repeatedly. Such as: epoxy, furan, amino, phenolic, etc.
Garbage bin mould
It is a method in which the plastic material is first heated and melted in the heating barrel of the injection molding machine, and then the melt is pushed into the cavity of the closed mold by the reciprocating screw.
It can not only produce high-precision, high-quality products under high productivity,Bucket mould but also has a wide variety of plastics that can be processed, a large output (about 1/3 of the total amount of plastic) and a wide range of uses. Therefore, injection molding is an important part of plastic processing One of the molding methods
Extrusion molding
Extrusion is a method in which the plastic is continuously passed through the die in a flowing state by heating and pressing in an extruder.
It is generally used in the molding of plates, pipes, monofilaments, flat wires, films, wire and cable coatings, etc., with a wide range of uses and high yields. Therefore, it is one of the important molding methods in plastics.
Foam molding
It refers to the addition of suitable foaming agents to the foaming materials to produce porous or foamed products. The foamed products have low relative density, high specific strength, low raw material consumption, sound insulation, heat insulation and other volt points. There are PVC, PE and PS etc.
Products include: films, sheets, pipes, and profiles, etc. Foaming can be divided into chemical foaming and physical foaming.
Blow molding
Blowing (expanding film) molding (or hollow blow molding) refers to a molding method in which the hot thermoplastic parison or sheet in a closed mold is inflated into a hollow product by means of fluid (compressed air) pressure.
Plastic containers produced by this method. Such as various bottles, square, round or flat barrels, gasoline tanks, etc. have been widely used, and newly developed various industrial parts and daily products, such as double-walled box-shaped products, L-ring large drums. Stacking boards. Surfboards. Seat backs and desks, as well as front spoilers for automobiles, belt covers, instrument panels, air-conditioning vent pipes, etc., which have been applied in practice and processed materials From daily-use plastics to engineering plastics, blow molding has become one of the important molding methods in plastic processing.
What is the mold used to make a resin table?
1. What is the mold used to make the resin table?
A typical fence structure can be done. Because the river table is mostly in the form of a board surface and not very thick, it can generally be made without any special molds. You can find some pvc boards or other flat boards as frame fences, both are ok. If you use glass plates or metal plates, you can use some mold release materials, such as mold release wax, for smoother demolding.
What is the mold used to make a resin table?
2. What material is used to make resin mold?
A typical resin glue mold is referred to as a glass fiber reinforced plastic mold, or glass fiber mold, which is generally composed of glass fiber and resin hand-laid laminated composite.
The main materials of the resin glue mold are glass fiber, resin glue and mold gel coat. Other materials include some mold release wax, curing agent, polishing wax and so on. Glass fiber has 30g surface mat without alkali, 300g chopped strand mat and 400g gingham cloth. The resin includes vinyl resin or unsaturated resin and epoxy resin, etc. The mold gel coat generally uses vinyl system.
If you want to know the specific mold materials to be used, it is recommended that you contact your local composite material distributor. Generally, they will provide you with a complete list of mold making materials based on your actual situation.
. The underdevelopment of the mold industry will seriously affect the production of manufacturing products such as automobiles, IT and electronic technology products, mechanical and electrical products, aviation (sky), ships, building materials, and household appliances.
Moulds are special forming tools and special tooling for forming manufacturing product parts (including stamping parts, plastic parts, forgings, rubber parts, glass and ceramic parts, etc.), as well as special technical products.
The mold will be specially designed and manufactured according to the technical requirements and production batches of the shape, size and dimensional accuracy, surface quality of the manufacturing product parts.
Therefore, study the modern design and manufacturing technology of molds, study the practical experience in the mold design and manufacturing process, and the technical management and process control of the production process, and form a standard, form an expert system, which is helpful to improve the mold production technology and management level, Improving the core competitiveness of mold companies will be of utmost importance.
Modern mold production method and production process
Before the 1930s, simple tools and equipment were used to form a workshop-style production method of hand-made molds. During this period, only simple molds can be manufactured. The manufacturing accuracy and quality of molds are completely dependent on manual skills and practical experience.
From the 1930s to the late 1970s, it was the development process of industrialized production methods for molds. Its main achievements and characteristics are:
Widely use milling process, precision forming and grinding process, and realize round hole and shape with precise pitch
EDM processing technology and NC wire EDM processing technology are widely used, providing key processing technology for high-hard materials.
Realize the specialization, serialization and standardization of mold materials.
In the meantime, the high development of mold standardization, the comprehensive use of standard parts and components for design and manufacturing in mold production, is not only a major achievement and feature of the industrialized production method of molds, but also an important technical basis for realizing modern mold production methods.
With the progress and development of the computer and machine tool industry, since 1980, mold CAD/CAM and CAD/CAM/CAE have become widely used production technologies. They cooperate with the high degree of standardization to form a modern mold production method, that is, an informatized and digital mold production method that realizes mold design and manufacturing.
Flower pot mould
The mold steel materials processed by the mold parts have high hardness, which requires the mold processing equipment to have thermal stability and high reliability.
For complex cavities and multi-functional composite molds, as the shape of the part becomes more complex, the design and manufacturing level of the mold must be improved. Multiple grooves and multiple materials are formed in a set of molds or assembled into a multi-functional composite of components The mold requires a large amount of processing programming, a high-deep cavity comprehensive cutting ability and high stability, which increases the processing difficulty.
The machining quality of mold parts includes machining accuracy and surface quality: machining accuracy is the degree of conformity between the three geometric parameters of the actual size, shape, and position of the surface of the processed part with the ideal geometric parameters required by the drawing; the deviation of the actual geometric parameters of the part from the ideal geometric parameters The value is called machining error.
Machining accuracy and machining error are both terms to evaluate the geometric parameters of the machined surface. Machining accuracy is measured by tolerance grade, the smaller the grade value, the higher its accuracy; the processing error is expressed by a numerical value, the larger the value, the greater the error. High machining accuracy means small machining error, and vice versa; the actual parameters obtained by any machining method will not be absolutely accurate. From the perspective of the function of the part, as long as the machining error is within the tolerance range required by the part drawing, the machining is considered guaranteed Accuracy.
The quality of the machine depends on the machining quality of the parts and the assembly quality of the machine. The machining quality of the parts includes the machining accuracy and the surface quality. The machining accuracy refers to the actual geometric parameters (size, shape and position) and the ideal geometry after the machining The degree to which the parameters match. The difference between them is called machining error. The size of the machining error reflects the level of machining accuracy. The greater the error, the lower the machining accuracy, and the smaller the error, the higher the machining accuracy; the main aspects that affect the machining accuracy: dimensional accuracy, the degree of conformity between the actual size of the processed part and the center of the tolerance zone of the part size.
The injection cycle time is as short as possible under the premise
The injection cycle time is as short as possible under the premise of ensuring product quality. The shorter the injection cycle time, the more the production quantity, the lower the manufacturing cost per unit product. Injection cycle time includes: injection time, holding pressure time, cooling time (melting time), mold opening time, ejection time (including dwell time), door opening time, pickup time, door closing time, and mold clamping time (special The situation also includes the forward/backward time of the shooting stage and the time of spraying release agent).
The most important methods to shorten the injection cycle time are: reduce the wall thickness of the plastic part/runner size (to shorten the cooling time), reduce the opening and closing distance/thimble stroke, quickly take out the product, manipulator operation, and accelerate the speed of opening/closing the safety door , Reduce the phenomenon of plastic parts sticking to the mold, correctly choose the cooling time, reasonably set the opening/closing speed and the ejector speed/number of times.
"Scrap is the biggest waste." If there is a high defect rate, a large amount of scrap or a return phenomenon in the injection molding production process, the loss of raw materials, electricity, labor, and equipment (excluding other costs) will be very high. Big.
If mold maintenance is not done in place, mold failures will often occur during the production process, and frequent production stops will be required for maintenance. This will affect the smooth production and the stability of the quality of rubber parts, and will cause economic losses to the enterprise (such as mold repairs) Costs, plastic materials/power consumption, labor costs, loss of machine shutdown, etc.)
Taizhou Huangyan Jtp Mould Co.,ltd is known as one of the best China Plastic Bucket mould Manufacturers and Plastic Bucket mould factory for plastic household items