If the wire drawing material is used for injection molding, the product is easy to warp;
If injection drawing is used, the product is easy to crack.
Question 2: Formulation of plastic wire drawing process. Let me put it in the farmer's language: there are many varieties of polymer materials. Commonly known as plastic. All substances are plastic, but when some substances are added, once they are melted, the fluidity becomes worse, that is, the harder they are, that is, the reversibility is poor. Many products are made of recycled plastics, but of course they are not as good as the original materials. There should be something wrong with your material, and the quality of drawing depends on the processing technology, temperature control of plastic extrusion equipment, cooling length and so on. If the temperature is not well controlled, the product cannot be completely cut.
Question 3: What is the plastic ribbon made of? This ribbon is basically PP, but I seldom see it in PET, mainly because of the price. Most of these cheap things are pulled out with recycled PP materials.
As for color, there are many color masterbatches, which are cheap and the color powder is also useful, but the dust is too big. That is to say, in the early stage of extrusion molding, PP material and color masterbatches are mixed together, and then the color is extruded after melting, and the color masterbatches are cut into pieces by colored particles.
I don't know the rest. I don't know the main ingredients of masterbatch and toner, but there are too many factories selling this kind of thing. LZ can learn more about it. If you want a high surface gloss, you need to add less materials.
Question 4: What's the difference between plastic drawing and granulation? Learn more. 10: granulation means making granules and then making products for downstream customers. Drawing is a direct product, like woven bag, which belongs to drawing.
Question 5: Is it drawn metal or plastic? Is it drawn metal or plastic?
The former has good thermal conductivity, and it will generate heat when it is close to CPU. The thinner the thickness, the better the hardness.
On the contrary, the same toughness requires a higher thickness.
Therefore, ultrabooks are generally metal or metal A-side ABS back.
Question 6: Is it necessary to electroplate the plastic parts with wire drawing effect? Is it okay not to electroplate? To produce this picture effect, other techniques can also be used, and painting is also possible.
Question 7: What is a brushed LCVM metal brushed textured panel? It is a new composite material made of metal and plastic. This material is used in Dell Inspiron 14R series computers, which is officially said to have better heat dissipation than ordinary engineering plastic materials. (I don't feel obvious when I use it)
Piano baking paint process is a kind of baking paint process, and the process is very complicated. First, you need to paint putty on the board as the bottom layer of painting; Leveling the putty, and grinding until the putty is dry; Then spray the primer repeatedly for 3-5 times, and polish it with water sandpaper and emery cloth after each spray; Finally, spray 1-3 times bright topcoat, and then bake and cure the paint layer at high temperature.
Question 8: Plastics have many uses:
① Ordinary plastics
Generally, it refers to plastics with large output, wide use, good formability and low price. Universal element
granule
There are five kinds of materials, namely polyethylene (PE), polypropylene (PP), polyvinyl chloride (PVC), polystyrene (PS) and acrylonitrile-butadiene-styrene (ABS). These five kinds of plastics account for the vast majority of plastic raw materials, and the rest can basically be classified as special plastic varieties, such as PPS, PPO, PA, PC, POM and so on. It is rarely used in daily life products, and is mainly used in high-end fields such as engineering industry and national defense technology, such as automobiles, aerospace, architecture, communications and other fields. Plastics can be divided into thermoplastics and thermosetting plastics according to their plasticity. Usually, thermoplastic products can be recycled, but thermosetting plastics can't. According to the optical properties of plastics, they can be divided into transparent, translucent and opaque raw materials, such as PS, PMMA, AS and PC, which belong to transparent plastics, while other plastics are mostly opaque plastics.
Properties and uses of common plastic varieties
1. Polyethylene: Commonly used polyethylene can be divided into low-density polyethylene (LDPE) and high-density polyethylene (HD
special plastics
PE) and linear low density polyethylene (LLDPE). Among the three, HDPE has better thermal, electrical and mechanical properties, while LDPE and LLDPE have better flexibility, impact properties and film-forming properties. LDPE and LLDPE are mainly used in packaging film, agricultural film and plastic modification. And HDPE is widely used in films, pipes, daily necessities for injection and other fields.
2. Polypropylene: Relatively speaking, polypropylene has more varieties, more complex uses and more fields. The main varieties are homopolypropylene, block polypropylene (copp) and random polypropylene (rapp). According to different uses, homo is mainly used in drawing, fiber, injection molding, BOPP film and other fields.
3.PVC: Because of its low cost and self-flame retardant characteristics, it is widely used in the construction field, especially in sewer pipes, plastic steel doors and windows, plates, artificial leather and so on.
4. Polystyrene: As a transparent raw material, it is widely used, such as car lampshades, daily transparent parts, transparent cups and cans.
5.ABS is a widely used engineering plastic with excellent physical, mechanical and thermal properties. Widely used in household appliances, panels, masks, components, accessories and so on. Especially household appliances, such as washing machines, air conditioners, refrigerators, electric fans, etc. It is also widely used in plastic modification.
② Engineering plastics
Generally speaking, it refers to plastics that can withstand certain external forces, have good mechanical properties, high and low temperature resistance and good dimensional stability, and can be used as engineering structures, such as polyamide and polysulfone. Among engineering plastics, it can be divided into general engineering plastics and special engineering plastics. Mechanical properties of engineering plastics
Engineering plastics (2 sheets)
Performance, durability, corrosion resistance, heat resistance and other aspects can meet higher requirements, processing is more convenient, and it can replace metal materials. Engineering plastics are widely used in electronics, automobiles, construction, office equipment, machinery, aerospace and other industries. Replacing steel with plastic and wood with plastic has become an international fashion trend.
General engineering plastics include: polyamide, polyoxymethylene, polycarbonate, modified polyphenylene ether, thermoplastic polyester, ultra-high molecular weight polyethylene, methylpentene polymer, vinyl alcohol polymer and so on.
Special engineering plastics can be divided into crosslinking type and non-crosslinking type. Cross-linking types include: polyamino bismaleimide, polytriazine, cross-linked polyimide, heat-resistant epoxy resin and so on. Non-crosslinked ones include polysulfone, polyethersulfone, polyphenylene sulfide, polyimide, polyetheretherketone (PEEK) and so on.
③ Special plastics
Generally, it refers to plastics with special functions, which can be used in special application fields such as aviation and aerospace. For example, fluoroplastics and silicone resins have outstanding special functions such as high temperature resistance and self-lubrication, while reinforced plastics and foamed plastics have special properties such as high strength and high cushioning. These plastics belong to the category of special plastics.
A. reinforced plastics:
The raw materials of reinforced plastics can be divided into three types in appearance: granular (such as calcium-plastic reinforced plastics), fibrous (such as glass fiber or glass cloth reinforced plastics) and flaky (such as mica reinforced plastics). According to materials, it can be divided into cloth-based reinforced plastics (such as rags reinforced or asbestos reinforced plastics) and inorganic mineral fillers. & gt