1. Tips for ink preparation
1. What color ink is missing. For example, in orange ink, a small amount of red can be added when red is visually lacking.
2. When removing more than one hue in a hue, the principle of complementary colors should be applied correctly. In the production practice, sometimes in order to make the whiter white, add a small amount of ultramarine blue (about 1%) to the white ink, which can be used to eliminate the yellow in the white. You can eliminate the yellow tone in the black ink.
3. When making light color ink, add color ink to the white ink instead of adding the white ink to the color ink. The hiding power of the white ink is extremely strong. Too much addition will quickly dilute the color; To add black ink to the color ink, do not add the color ink to the black ink, because the color strength of the black ink is very strong, and if you add too much, you need to add a lot of color ink to adjust the color.
4. When observing color samples, it is best to use a standard light source, and use the same bottom plate.
2. Tips for printing plate installation
1. Check the network cable and layout to ensure that there are no bumps, scratches, or chrome. Pay attention to the direction and position of the version to ensure that the vertical version is basically correct.
2. Special attention should be paid to check the cleanliness of the stuffy cover and the plug to prevent the assembly errors caused by foreign objects. Care should be taken to avoid scratching the layout.
3. Run at low speed to check whether the plate roller is eccentric or not, which is the unbalanced rotation caused by assembly error.
Three, manual addressing tips
When the color code is in reverse order, select the leftmost group of signals; when the color code is in reverse order, select the rightmost group of new numbers.
Four, aging judgment tips
1. The aging time refers to the continuous aging time, not the accumulated time after intermittent aging. Under normal circumstances, it is not necessary to wait for the main agent and curing agent to fully react before they are fully cooked, but some emergency production of cooking bags, that is, customers will use it immediately, need The aging is complete. Although the peel strength of the packaging bags produced by these two methods is not much different, the temperature resistance and corrosion resistance are very different.
2. According to the state of the adhesive after aging, it can be judged whether the ratio of curing agent and main agent is appropriate. If the adhesive is not dry, it means that the content of curing agent is too small. If the adhesive is hard and brittle , Indicating that the content of curing agent is too high.
Fifth, check if the tension matches the tips when compounding
Stop during the lamination process, and use a blade to draw a cross on the composite film at the rewinding position. The most ideal state is that the composite film remains flat after the scoring. If the composite film is curled in a certain direction, it means that the tension of this layer of film is too large, and the tension of this layer of film should be appropriately reduced or the tension of another layer of film should be increased.
6. Tips for setting the heat sealing temperature during bag making
When setting the heat-sealing temperature, the thickness of the heat-sealing film, heat-sealing cloth and composite materials with different structures should also be considered. For example, the heat-sealing temperature of the PE80 single-layer film is 120 ° C, and the temperature barrier of the heat-sealing cloth is generally 40 ~ Around 60 ℃, the temperature barrier of PET12 / A17 is 20 ℃, and the temperature barrier of NY15 is 15 ℃, that is, due to the influence of material structure and heat sealing cloth, the final heat sealing temperature of PET12 / A17 / PE80 is 185 ℃ The heat sealing temperature of NY15 / PE80 is 180 ℃.
Basic knowledge of plastic printing
1. What are the characteristics of ink commonly used in plastic gravure printing?
(1) Good fluidity and transferability; (2) Good affinity; (3) Good weather resistance; (4) Bright hue, high saturation, high color density, good The transparency or opacity, strong adhesion and other characteristics.
2. What determines the high and low printing speed of the gravure printing machine?
The printing speed of the gravure printing machine is first determined by the length of the transmission distance between the colors of the printing machine. Secondly, the printing speed is determined by the quality of the drying box. The drying box has a good effect and the ink is completely dried. Not only will the ink of the previous color not dissolve, but also the residual of the solvent will be reduced.
3. What are the four elements of the gravure printing machine and the main points of the device?
Gravure printing is determined by the four major elements of the printing machine, which determine the quality of the printed matter. The four major elements are: (1) doctor blade; (2) embossed rubber roller; (3) ink supply system; (4) drying box.
â‘ The part of the doctor blade device should be selected: whether the blade clamp and the blade holder are separated, the height adjustment device of the blade holder, the pressure adjustment method, and the swinging device.
â‘¡Selection of the part of the embossing rubber roller and the adjustment device: the hardness and solvent resistance of the material of the embossing rubber roller, the device that is separated from the printing plate roller, and the method of pressure adjustment.
â‘¢ The main points of the ink supply system selection: the method of applying ink, whether the ink tank circulation is reasonable, the configuration of the ink pump, and the configuration of the ink viscosity test.
â‘£The choice of drying box configuration: heating method, temperature adjustment device, blowing device and adjustment device, whether it matches the printing speed, whether it is running down, whether there is a secondary air return device, exhaust device.
4. How much dyne is needed for the surface tension of plastic film for plastic printing?
The tension of the solvent ink used in plastic printing is about ≥33dyn / cm, and the tension of the adhesive for plastic composite is about ≥39dyn / cm; so the surface of the plastic film used for letterpress printing, gravure printing, lithographic printing, and leak printing Tension is required to be above 36-38dyn / cm, and the surface tension of the plastic film for compounding is required to be> 42-54dyn / cm.
Therefore, PE, PP, PC and other plastic films with a critical surface tension <29 to 33 dyn / cm require surface treatment. Like polar plastic film with critical surface tension> 39 ~ 45dyn / cm or more, such as PVC, PA, PET plastic film, no surface treatment is required during printing, compounding, and aluminum plating.
5. Why do corona pretreatment before printing materials such as polyethylene and polypropylene? What is its corona treatment effect?
(1) Non-polar characteristics of molecular structure; (2) Small surface tension; (3) Strong chemical stability; (4) Influence of additives, the film corona treatment degree generally needs to reach 38 dynes / cm. The effect is surface oxidation; microscopic rough surface; crosslinking reaction of low molecular substances on the surface, remove the weak interface layer on the surface, and enhance the adhesion of the ink.
6. When plastic packaging adopts gravure printing method, what are the methods of gravure plate-making?
The gravure plate-making methods are: (1) etching plate-making; (2) direct method; (3) electronic engraving; (4) offset gravure conversion method; (5) electron beam engraving; (6) laser engraving, etc.
7. When intaglio printing, is it necessary to install an auxiliary blade (hard blade) for the doctor blade? What is the best angle of the blade? What is the best tangent angle of the contact point of the blade and the roller? How can the blade extend its life?
The auxiliary blade must be installed; 60 degrees; 55-70 degrees; (1) the blade is installed correctly; (2) the plate roller is installed accurately; (3) the plate roller has no eccentricity, cone, drum and other disadvantages; (4) the blade should be flat Straight and smooth; (5) Use a large angle (between the doctor blade rollers) for printing; (6) Reduce the doctor blade pressure appropriately.
This part of BBQ Tools Set usually is packing with tired card, head card,buster card for showing the item clearly. And the single item also will be packed with color box .In this part we will show some item for special use such as slotted turner with jag for cutting side cooking,a large area of turner for cooking massive meat and so on.Certainly ,customized is accepted that you can print your logo on it or manufacture your design. Our bbq tools of handle material have many different choice like hardwood ,beech,PP,PVC, bakelite , metal etc..
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