The seven major plastic surface treatment processes that must be understood:
Surface treatment is the formation of a layer of one or more special properties on the surface of a material by physical or chemical means. Surface treatment can improve the appearance, texture, function and other aspects of the product.
Appearance: color, pattern, logo, glossy lines (3D, 2D);
Texture: feel, roughness, life (quality), streamlined, etc.;
Function: hardening, anti-fingerprint, anti-scratch;
First, in-mold decoration technology (IMD)
In-Mold Decoration-IMD: The film with the printed pattern is placed in a metal mold, and the resin for molding is injected into the metal mold to bond with the film to make the film with the pattern printed. A method of forming a resin into a single body and solidifying into a finished product.
IMD contains IML (no stretch, small surface), IMF (high tensile product, 3D), IMR (surface film removed, leaving only the ink on the surface).
At present, IML and IMF are collectively referred to as IML.
IMR process flow:
1. Exquisite decorative graphic and logo are hidden inside, and disappear without friction or chemical corrosion; 2. Graphic, logo and color design can be changed at any time without changing the mold; 3. Three-dimensional shape product, accurate printing accuracy , error ± 0.05mm; 4, can provide graphic, logo back light transmission and high light transmission window effect; 5, function button convex bubble uniform, feel good, life can reach more than 1 million times; 6, three-dimensional changes Can increase the designer's freedom of product design; 7, composite molding processing achieves seamless effect.
Second, painting ( Painting )
Spraying: A method of spraying on a coated workpiece by atomizing the paint with a spray tool such as a spray gun. Process: injection molding → primer → drying → topcoat → drying technology features:
Advantages: 1, rich in color; 2, processing in liquid environment, can achieve complex surface treatment; 3, mature technology, mass production; 4, unique transparency, high gloss.
Disadvantages: 1. The cost is too high, and the low-cost positioning product is not suitable for this process; 2. The process is relatively complicated and the yield is low.
Third, NCVM non-conductive vacuum plating
NCVM: Also known as discontinuous coating technology or non-conducting electroplating technology, it is a film that is plated with metal and insulating compound. With its discontinuous characteristics, the final appearance has a metallic texture and does not affect the wireless communication transmission effect. .
1. The manufactured product is non-conductive and can be tested by high voltage meter with high voltage of tens of thousands of volts. It is not conductive or not broken. 2. The surface of the product has a metallic texture and can achieve translucent control.
Plating: Provides plastics with a metallic finish at a higher yield and lower cost. Similar to PVD, PVD is a physical principle, electroplating is electroless plating, and is mainly divided into vacuum plating and water plating.
1. Weight reduction; 2. Overall cost saving; 3. Less processing steps; 4. Simulated metal parts.
1, including metal inserts can not be changed during the molding process; 2, mold manufacturing more than 200 square inches of parts than drawing die is more difficult; 3, electroplating plastics used in certain types of household appliances, there is a risk of fire.
Plastic parts printing: plastic parts printing: a process of printing the desired pattern on the surface of plastic parts by pad printing, screen printing, transfer and other methods.
Pad printing: is an indirect concave plastic head printing technology. First, the designed pattern is etched on the printing plate, the etched plate is coated with ink, and then most of the ink is transferred to the object to be printed through the silicone head. on.
Screen printing: It is a main printing method in stencil printing: the printing plate is in the form of a mesh, and the ink on the printing plate is printed on the printing plate through the through-hole portion of the printing plate under the extrusion of the squeegee. Usually the screen is made of nylon, polyester, silk or metal mesh. Transfer: water transfer, thermal transfer
Water transfer: a type of printing in which a transfer paper/plastic film with a color pattern is subjected to macromolecular hydrolysis by water pressure.
Thermal transfer: A technique in which a pattern or pattern is printed on a heat-resistant adhesive tape, and the pattern of the ink layer is printed on the finished material by heating and pressurizing.
Six, laser carving
Laser engraving: also called laser engraving or laser marking, is a process of surface treatment by optical principle. Similar to screen printing, laser engraving can be used to type or pattern on the surface of the product.
1. Wide range, safe and reliable
2, accurate, meticulous, safe and fast
3. Low cost and environmental protection
Seven, biting flowers
Biting flower: It is a method of etching the inside of a plastic molding die with a chemical such as concentrated sulfuric acid to form a pattern in the form of serpentine, etched, plowed, etc., and the plastic has a corresponding texture on the surface after molding through a mold.
Process: mold receiving → sand blasting → chemical cleaning (pickling) → decaling → picking powder → heating → Shangyang → dry paint → chemical corrosion → chemical cleaning → sand blasting → quality inspection
1. Improve the visual effect and feel of the product
3, increase the surface area, which is conducive to heat dissipation
4, is conducive to demoulding, easy to shape