¡æ Plastics that allow for U.V coating |
Materials include ABS, PC (Poly Cabonet), PC-ABS, PP (Poly Propilen) |
¡æ External inspection on molded products |
When injection molded products are received, overall external conditions such as contraction, |
burr, flow mark and gas are inspected. |
¡æ Ultrasonic cleaning |
Since large amount of anti-rust additive and release agent is used during injection molding, |
ultrasonic cleaning must be done at least once usinig a volatile cleaning agent to remove release |
agent or dust, improving adhesiveness and surface hardness during U.V coating. Here, the |
principle of ultrasonic cleaning is to add physical force on crystal oscillator after adding volatile |
liquid into cleaning tank. Liquid spreads out at tens of thousands of cycles per second from |
crystal oscillator for easy cleaning of corners. This is the main cleaning method used. |
¡æ Q - RING |
Cleaned product is placed in an electric oven to dry vaporize volatile component and moisture. |
Drying time: PC- 10 minutes at 70¡É, ABS- 10 minutes at 60¡É, AS&PP- 10 minutes at 50¡É |
¡æ Jig Assembly |
Jig is needed for each product to take post processing line, and selection of incorrect jig can |
cause various defects such as deformation and color deviation. |
¡æ U.V Base Coating |
The purpose of base coating is to cover the surface of injected products, and quality of the |
product is determined in pretreatment process. Base coating is divided into glazed, semi-glazed |
and matt. |
¡æ U.V Coating Process |
Jig is assembled after cleaning of product to follows the line to pass by anti-static room and |
booth to vaporize solvent in U.V primer. Solid remaining after vaporization passes by U.V drying |
room in 2 or 3 seconds to momentarily harden using U.V light. |
1) U.V intensity in U.V drying room 800mJ /§² ¡ 1000mJ /§² |
2) U.V intensity at 1 PM on a sandy beach during summer 400mJ/§² |
¡æ Vacuum - AL Metallizing |
U.V base coated material is inserted into chamber, and about 20 ~ 30 minutes are required until |
pumping start high vacuum 2¡¿10-4 Torr. Detection sensor is operated to evaporate aluminum foil |
hanging on tungsten coil by turning it into liquid. Here, evaporation phenomenon is referred to |
as "vacuum deposition of aluminum". Unit is in ohms, and 10~200 ohms are widely used.
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