8 tipos especiais de métodos de fabricação de plástico

8 special types of plastic manufacturing methods

Plastic manufacturing methods

Plastics processing is an integral and important aspect of the plastics industry and has been around for several years. It includes many different manufacturing methods, which are discussed in this blog.

Plastic manufacturing is the design, manufacture and assembly of plastic products using several different processes. Custom plastics manufacturing includes tasks such as testing new types of plastics, developing new plastic products, and purchasing state-of-the-art machinery to produce plastics better and faster.

1. Mixing/Composing

Compounding is a plastic manufacturing process in which two or more plastics are first melted and formed into a mixture. Once molded, they are molded into new shapes. When mixing, composite plastics must be mixed with precise specifications and quantities to ensure the final product is produced as desired. As with metal alloys, the composition can be used to improve the performance/properties of the final product. Some of the most common plastic compounds are:

2. Shapes

Molding is one of the oldest manufacturing processes that is still used successfully by many plastics manufacturers. Injection molding, rotational molding, and blow molding are all ways used to create plastics.

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Small plastic pellets used in the molding process. They come in all kinds of sizes and colors.

Injection molding is by far the most versatile molding technology available. Injection molding uses different sized presses depending on the pressure and tonnage of the product. Injection molding can be used to produce large parts, such as plastic automobile parts, as well as small plastic components for surgical applications. Injection molding is a slightly more expensive plastic molding technique and is only used to produce plastics that require a high melt index.

The name of this molding process is self-explanatory. The heated plastic is placed into a heated mold and then compressed in high-performance presses. Curing is then carried out to ensure the product retains its integrity and does not deform. Compressed molding is ideal for high-strength compounds such as thermosetting resin.

Plastic blow molding is similar to glass molding. A preform is first inflated with air. This air is then pressed against the plastic mold of the desired size. After the mold cools, the plastic is ejected. Blow molding is quite simple and linear and can quickly produce large, entire hollow bodies. Plastic bottles, fuel tanks, and other plastic components with cavities are generally made by blow molding.

Rotational molding uses rotational motion and high temperatures to coat the inside of a mold, layer by layer, ultimately creating the part. The constant rotation creates high centrifugal forces, which result in products with uniform walls. Rotational molding is used to produce large hollow containers. Therefore the rotation is not very fast. However, for certain products, this process is economical and sometimes cheaper than other types of plastic molding processes. Hollow plastic components such as buoys, fuel tanks and canoes are all manufactured by rotomolding. Another advantage of rotomolding is that it generates very little waste, as excess or run-off plastic can be immediately reused at the manufacturer.

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Plastic tanks like the one shown above are made using a rotomolding process

3. Plastic extrusion

Plastic extrusion is used to produce plastic sheets, tubes and pipes. In this method, plastic is first melted and processed into pellets. Once the small pellets are formed, they are pressed through a die. Many manufacturers prefer this method due to its speed, robustness and reproducibility. Plastics made using this method also resist stress better than other types of plastic because extruded plastics have no seams.

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Extruded plastic rods. They tend to have better resistance because they have no seams

4.Thermoforming

Thermoforming is a manufacturing process in which thermoplastics are softened through heat and then reshaped depending on the desired product. Thermoforming is performed using many different techniques, such as folding sheets of plastic over a heat tape and shaping them into the desired parts using vacuum molding. In thermoforming, tooling costs are comparatively low compared to other manufacturing processes. This is because thermoformed parts do not need to be treated at high temperatures and pressures.

5. Drilling

Punching is one of the most efficient techniques for cutting plastic films and thin sheets of plastic into finished parts. Some of the common plastics produced by stamping include polycarbonate films, polyester films, and HDPE sheets.

6. Lamination

Lamination is the process of coating the external surface of items to be protected from external influences or environmental damage. Lamination also improves the design, appearance and durability of the product to which it is applied. Resin and foil are two of the common plastic compounds used for lamination. During this process, pressure and heat are often used simultaneously to ensure that the laminated material adheres effectively to the product being laminated. Resin lamination is generally performed to create an adhesive layer between two substrates. Foil lamination, on the other hand, is performed to create a plastic barrier on the outside of the product. Common laminating materials include metal sheets, paper, and soft foam.

7. Welding

Welding is not only used in metal processing. It is also often used to join thermoplastics that cannot be properly joined using adhesives or other bonding techniques. Plastic welding includes manufacturing methods such as hot plate welding, ultrasonic welding, rapid tip welding, and hot gas welding.

8.Plastic foams

By forming plastic foam, plastic insulators are created, ideal as insulation materials for buildings. This manufacturing process uses polystyrene and polyurethane to produce plastic foam. Synthetic foam lasts longer than other types of foam and also has better insulating properties.

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There are many plastic processing companies in China. At Wayken, we can provide a premium plastic machining service to meet your plastic processing needs. Whether prototype or series production – we look forward to hearing from you and turning your ideas from the drawing board into reality.

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