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1 Base map production

Decorative pattern base map in addition to computer or hand-drawn, most of the choice of plastic samples and artificial leather on the decorative pattern.

Plastic samples should be selected pattern clear, uniform, flat surface, first sprayed a layer of black self-drying paint, drying, with more than 200 mesh white powder (calcium carbonate) coated, fill in the grain, and then gently wipe away the prominent surface of the white powder, so that it reveals the black, until the layout of the pattern is clear, black and white, the base map will be completed.

If you choose to use artificial leather decorative pattern, you can flatten the artificial leather nailed to the board, according to the above requirements for the same processing, it is best to use black artificial leather, you can save the spray paint.

2Photographic plate

Adopt CR or SO soft film, 1:1 to the bottom picture for shooting. Photographic negative size to 100mm × 200mm or so appropriate, easy to make screen plate and decal transfer.

3 Screen plate making

With 200 ~ 300 mesh yellow polyester silk, 0.02mm thick blue photographic film, aluminum frame and photographic film, according to the manufacture of printed circuit screen plate manufacturing method.

4 ink blending

Selection of high-quality solid asphalt 500g, loaded into a clean rust-free iron cans, plus kerosene 300ml, placed on the adjustable temperature furnace simmering 1 ~ 2h, control the state of micro-boiling, stirring appropriately, refining to the consistency of suitable for screen printing to cool to room temperature for the soft jelly, the surface is not skinned and not wrinkled for the best, this is the asphalt printing ink.

Asphalt ink and 2711-4 ink (Tianjin ink factory products), according to the weight ratio of 1:1 mixing, and then add Peony No78 dry oil, the amount of mixed ink weight of 2% to 5%, with the ink knife mixing, it will be made of resist transfer ink.

5 Decorative paper printing

With WPS400 screen printing machine, mounted screen version, rubber squeegee put on the appropriate amount of resist transfer ink, first with the waste of blue paper reverse try to print, the force should be uniform, light and important moderation, do not return to the ink, until the printing of uniform and clear decorative texture, and then use the decal paper printing.

Decal paper should be cut into the appropriate size before printing, with a clean rubber scraper scraping. Printing process, such as the occurrence of ink clogging the mesh, the pattern is not clear, indicating that the ink is too dry, you can add the right amount of kerosene to dilute;

If the printed decorative pattern is easy to blur, the kerosene in the ink is too much, the ink can be placed on the glass plate, with the ink knife repeatedly blend, volatile part of the kerosene and then print.

6 ink drying

Will be printed on the decal paper into the oven grid, ink face up, spread evenly, not overlap, temperature control 40 ~ 45 ℃, baked to ink half dry out, that is, lightly touch the ink on the decal paper is not sticky, a little pressure will be sticky, generally baked for about 10 ~ 15 min. ink baked too dry, transfer with the mold does not stick or poor bonding force; ink is too moist, transfer easy to blur.

7 mold pre-treatment

This process should be done before the decal paper printing decorative patterns.

Mold to do decorative texture surface roughness should reach above, there should be no sand holes, scratches, to ensure that the decorative texture is complete, clear and consistent. Failure to meet the requirements, should be supplemented by grinding.

Scrub the mold cavity and the surrounding area with gasoline to make the surface clean. Do not do decorative texture surface with nitro lacquer, vinyl chloride paint protection, brush two to three times, holes, slots can be rubber plugs, rubber cement, sealing tape protection.

Wait for the paint film to dry, do decorative pattern surface with magnesium oxide slurry degreasing, cleaning, until the surface can be completely wetted by water. Then, use a sponge to suck the water dry, hairdryer blow dry.

8 decal transfer

According to the characteristics of the mold cavity, the decal paper will be cut into a shape that is easy to paste, gently remove a layer of thin paper printed with decorative patterns, ink facing the mold, carefully pasted, requiring flat service paste without wrinkles, the plane with a rubber spatula scrape, the surface with a skimmed cotton kneaded into a ball, vertical pressure paper base, so that the decal paper ink transfer to the mold.

After the transfer, sponge with a small amount of water to wet the decal paper, and then gently remove the paper base, sponge or absorbent paper to absorb the water on the mold.

9 Drying

Transfer to the ink on the mold, the summer can be naturally dry, winter need to use infrared lamp drying, the requirements of the table, inside dry.

10 Trimming

Applique transfer mutual intersection and defective decorative patterns, with 0 or 1 strokes dipped in transfer ink to repair, after making up the infrared lamp drying, and then use a pen-type revision knife to trim excess ink, until the decorative pattern is uniform and clear, natural articulation.

11 corrosion

(1) corrosion solution formula

Ferric chloride 450 ~ 560g / L

Hydrochloric acid 5～10ml/L

Kerosene 10 ~ 15 drops / tank

Corrosion liquid Brahmi degree control 36～40°Be.

(2)Preparation before corrosion

Mould corrosion, do decorative pattern at the application of magnesium oxide water slurry degreasing, cleaning, and then water gun spray tap water for 1min, in order to check whether the ink and mold combination is solid.

Then use wool brush dipped in corrosion solution brush again, no ink should be uniform gray, completely wetted by water to ensure uniform corrosion. In the course of the above operation, if the ink falls off, should immediately stop corrosion, push back and start again, re-applique transfer.

Under normal operating conditions, the ink and mold combination is very firm, the reason for falling off is improper operation, such as decal transfer, molds are wet and not dry, or decal transfer paper ink baked too dry, or decal transfer without scraping, the operation should pay attention to.

(3) corrosion

After confirming that the mold can be corroded, the cavity around the double-sided self-adhesive paper and PVC plastic cloth paste around three layers, the formation of corrosion protection apron, longer than the mold 400 ~ 600mm. corrosion machine using a nozzle-type spherical nozzle, half of a sphere are 19 nozzles, can be uniformly three-dimensional injection.

Hang the mold with an electric hoist, cavity down, nozzle up and in the center of the protective apron, two people holding the mold slowly rotating, open the corrosion machine, using a stopwatch timing, corrosion 7 ~ 10min, take the lower limit in summer, take the upper limit in winter.

Decorative texture corrosion depth of specific requirements of the mold, the same kind of steel should be made decorative texture corrosion specimens, measured the time required.