24 Animated Pictures! It's Interesting To See Plastic Processing Technology In One Go
01
Injection molding
Injection molding is currently one of the most common molding methods in plastic products and can generally be divided into compression molding and die casting.
Injection molding machines mold thermoplastic/thermoset plastics into various shapes. In addition to the injection molding machine, the mold is also an important part of the molding process.
02
Extrusion molding
The plastic passes through the barrel and screw of the extruder. While being plasticized by heat, the plastic is pushed forward by the screw and continuously passes through the machine head to be made into products or semi-finished products of various cross-sections.
03
Rotational molding
This forming method is generally used in the production of axially symmetrical and centrally symmetrical parts. Liquid plastic or powder is added to the mold and then heated while the entire mold rotates.
In this way, the plastic is evenly coated, melted, and adhered to the inner surface of the mold cavity, forming into the shape of the mold. After cooling, shaping and demoulding, the product of the desired shape can be obtained.
04
Blow molding
Also known as hollow blow molding, it is a rapidly developing plastic processing method. The tubular plastic parison obtained by extrusion or injection molding of thermoplastic resin is placed in a split mold while hot (or heated to a softened state).
After the mold is closed, compressed air is immediately introduced into the parison to cause the plastic parison to expand and adhere to the inner wall of the mold. After cooling and demoulding, various hollow products are obtained.
05
Blister molding
A plastic processing technology whose main principle is to heat and soften a flat hard plastic sheet, then use vacuum to adsorb it to the surface of the mold, and then cool it to form.
06
Compression molding
Also known as press molding or compression molding, powdery, granular or fibrous plastic is first placed in the mold cavity at molding temperature, and then the mold is closed and pressurized to form and solidify.
Compression molding can be used on thermosets, thermoplastics and rubber materials.
07
Calendering
The melted and plasticized thermoplastic passes through the gap between two or more parallel counter-rotating rollers, causing the melt to be squeezed, stretched, and stretched by the rollers to become a continuous sheet with certain specifications and quality requirements. product. Finally, the natural cooling molding method is used for processing.
The calendering process is commonly used in the production of plastic films or sheets .
08
foam molding
Add appropriate foaming agents to foam materials (PVC, PE, PS, etc.) to form a microporous structure in the plastic.
Almost all thermosets and thermoplastics can be made into foams, and foam molding has become an important area in plastic processing.
09
Winding/winding forming
The process is to wind continuous fibers (or cloth tapes, prepreg yarns) impregnated with resin glue around a mandrel according to a certain pattern, and then solidify and demould to obtain the product.
10
Laminated molding
It refers to a molding processing method that combines multiple layers of the same or different materials into a whole under heating and pressure. Commonly used in plastic processing, but also in rubber processing.
11
Painting and molding
It is a process that uses plastisol or organosol to coat the surface of substrates such as cloth or paper to make imitation leather products, varnished cloth or plastic wallpaper, or coat powder plastic on metal surfaces.
Common plastic-coated products include artificial leather, varnished cloth, plastic wallpaper and various metal plastic-coated products.
12
casting
It is a method of plastic processing. In the early stage of pouring, liquid monomer, prepolymer or polymer is injected into the mold under normal pressure. After polymerization and solidification, it becomes a product with the same shape as the inner cavity of the mold.
Nylon monomer casting appeared in the 1960s, and the traditional casting concept changed. Polymer solutions, dispersions and melts can now also be used for cast molding.
13
Drop plastic
This technology takes advantage of the state-changeable characteristics of thermoplastic polymer materials, that is , it has viscous flow characteristics under certain conditions and can return to a solid state at room temperature , and uses appropriate methods and specialized tools for inkjet to achieve viscosity. The flow is molded in them into the designed shape as required and then solidified at room temperature.
14
Compression molding
Mainly used in the production of thermosetting plastic products. After molding, it is heated and melted, pressurized and punched, then heated and cross-linked to solidify, and the finished product is obtained after demoulding.
15
Cold press forming
It is a type of compression molding. Different from ordinary compression molding, the material is pressed and molded at room temperature.
After demoulding, the molded product can be cured by heating again or chemical action.
16
resin transfer molding
It is the process of injecting resin into a closed mold to penetrate the reinforcement material and solidify. This technology does not require prepregs and autoclaves, effectively reducing equipment and process costs.
This technology has developed rapidly in recent years and has been widely used in the aircraft industry, automobile industry, shipbuilding industry and other fields. RFI, VARTM, SCRIMP, SPRINT and other branches have been developed to meet the application needs in different fields.
No. 17
extrusion
It is a pressure processing method that uses a punch or punch to pressurize a blank placed in a concave mold to cause plastic flow, thereby obtaining parts corresponding to the shape of the die hole or concave and convex mold.
During extrusion, the billet generates three-dimensional compressive stress, and even billets with low plasticity can be extruded.
18
Sheet thermoforming
It is a special plastic processing method that processes thermoplastic sheets into various products.
Clamp the sheet to the frame and heat until softened. Under the action of external force, it adheres closely to the surface of the mold and obtains a shape similar to the surface of the mold. After cooling and shaping, the finished product is finished after trimming.
19
3D printing
One of today's "hot" rapid prototyping technologies. Specifically, it is a technology that uses adhesive materials such as powdered metal or plastic to construct objects by printing layer by layer based on digital model files.
Commonly used materials for 3D printing include GF+PA, PLA, ABS, PA, gypsum materials, aluminum materials, titanium alloys, stainless steel, silver plating, gold plating, rubber materials, etc.
The differences between 3D printing technologies are materials and printing speed. There are already some 3D printed parts that have shown good application performance in the downstream market.
Don’t worry, keep reading below for some related surface treatment techniques.
20
film formation
The film forming process is a process in which the film is heated and softened, and then external force is applied to shape and cool the film to form a 3D film.
It is mainly divided into two types: hot pressing and molding : the pressing process uses the temperature of the mold to soften the film, and then relies on the pressure of the mold closing to press the softened film into the cavity of the hot pressing mold, and then cools and finalizes the shape.
twenty one
Glue filling process
By mixing two kinds of glue, the surface of the product is painted to give the product a crystal clear effect.
The main functions include increasing surface effects, full glue dispensing, partial glue dispensing, glyph filling effect, filling effect, partial filling, weight controlled filling and other different effects.
twenty two
hot gas welding
Hot gas welding is also called hot air welding. Compressed air or an inert gas (usually nitrogen) is heated to the required temperature by a heater inside the welding gun and sprayed onto the plastic surface and steel bars, causing the two to melt and combine under moderate pressure.
, duration 01:35
Oxygen-sensitive plastics should use inert gas as the heating medium, while other plastics generally use filtered air. This method is commonly used for welding PVC, PE, PP, PS, POM and other plastics.
twenty three
hot plate welding
Hot plate welding uses an air extraction plate structure to transfer the heat from the heating plate to the welding surfaces of the upper and lower plastic heating elements through electric heating.
The surface is melted and then the heated platen machine is quickly withdrawn. After the upper and lower heating elements are heated, the molten surfaces fuse, solidify, and become one.
The whole machine is in the form of a frame and consists of three large plates: the upper template, the lower template and the thermal template . Also equipped with hot mold and upper and lower plastic cold mold. The action mode is pneumatic control.
twenty four
resistance welding
It is a manufacturing process and technology that joins metal or other thermoplastic materials (such as plastics) through heat. It is a method of welding by applying pressure through electrodes after the workpiece is assembled, and using resistance heat generated by current passing through the contact surface of the joint and adjacent areas.