Application and operation failure analysis of printing thermosetting ink

Suzhou screen printing ink, KUNshan PCB screen printing ink, PCB screen printing material suppliers

Thermosetting ink also known as plastic ink, or adhesive ink. Its ingredients: mainly polyvinyl chloride (PVC) and phthalate ester composition, the polyvinyl chloride and phthalate ester, fixing agent, stabilizer, thickening agent mixed composition of thermosetting ink.

Thermosetting ink is non-solvent-based ink, he is through heating, powder and additives between the dissolution of plasticizing infiltration fiber and cloth tightly bonded to form a firm film. Because of the restriction of the use of polyvinyl chloride now, polyvinyl chloride can be replaced by the modified body, to meet the requirements of environmental protection of thermosetting ink. Because polyvinyl chloride plasticizing temperature is different, thermosetting ink can be divided into high temperature and low temperature.

Thermosetting ink entered the market earlier, but due to the unfamiliar operation and production equipment restrictions, so that its promotion speed is relatively slow, now from its market promotion to production operation has been very mature.

Basic requirements for thermosetting ink

Other plate to use polyester type of hard plate, plate also want to use hard type, now tempered glass is more common, the use of screen according to the printing pattern flexible application. Such as: fine mesh transition recommended for 150 mesh to 250 mesh between the screen is more suitable, thermosetting ink itself on photographic adhesive no requirements. It is recommended to use oil and water for common printing patterns. So whether it is water or solvent can be used when wiping the board.

Stereoscopic thick film printing pattern

To use special thick film plate, photographic adhesive coating made of thick film? The screen is coated with 1 ordinary thickness, outside according to the thickness of the pattern with a round knife coating or coating with ordinary sizing device for many times, placed in the drying plate box for 40, 50, 60 minutes drying can be exposed. Because of the different photosensitive glue and exposure box power is not the same, so the exposure time must be tested. After development must be placed in the drying plate box low temperature drying water. Do not expose yourself to the sun when wet. Temperature is the key to the performance of thermosetting ink characteristics. So the tunnel drying heating equipment is recommended to use good insulation, heating constant temperature stability.

Special auxiliaries for thermosetting ink

Thermosetting ink is a very independent printing material. She has her own printing aid. Such as: diluent, thickening agent, softening agent, fixing agent and so on. If many additives need to be added or reduced during operation, it is recommended to contact the manufacturer first. Listen to your suggestions before performing operations. Do not add or subtract additives according to experience and cause unnecessary waste and loss.

Thermosetting ink process

Thermosetting ink according to different printing effects, divided into ordinary and special two types of technology.

General printing process generally refers to simple, solid, line monochrome color printing. This kind of process in addition to heating, and ordinary printing process. Easy to operate, no need to wipe plate, plasticizing, several times higher than the performance of water-based printing materials.

Special printing process generally refers to three-dimensional printing, foaming printing, suede printing, gravel printing, wire drawing printing, etc.

Grasp the curing temperature of curing ink

Most of the failure cases, the reason is not grasp the curing temperature and time. Ordinary printing pattern, curing generally needs 170? 180 shore ㄊ? Minutes. Special printing pattern, curing generally requires pre-baking 100? 30 seconds, the surface is dried before entering the drying channel dryer 170? 180? - 2 minutes. (The white surface cloth is easy to change color at high temperature, the temperature is appropriately reduced, and the time is prolonged.)

Common problems in thermosetting ink operation

1 ink drawing clean...... If the viscosity does not add diluent, 1% will do

2. Uneven edges... Return knife too much, or ink too thin

3. Bubbles in thick film pattern or on surface...... Curing temperature is not high enough or time is not long enough

4. The surface of the pattern is dull, without tension, falling off in powder form, without curing

5. Overheated ink discoloration, cloth color after sublimation traction ink absorption, recommended for pre-press sample test, if the cloth color is easy to sublimate, the use of anti-rising thermosetting ink.

6. Water-based mortar and thermosetting ink printing superimposed on each other, but the water slurry can cover printing thermosetting ink

7. Water-based printing color, can not be mixed with thermosetting ink

8. Thermosetting ink is not universal ink, different fabrics should choose the corresponding thermosetting ink

9 climate, environmental changes will affect the viscosity of thermosetting ink, according to the need to add thinner or thickener (not more than 2%).