(1) Grating material.
There are mainly hard plastic stereo gratings. The polystyrene raw material is processed by injection molding to form a concave-convex cylindrical mirror grating. Polystyrene is colorless and transparent (transparency is 88% -92%), refractive index is 1.59-1.6, non-ductile and flammable. Because of such a high refractive index, it has good gloss. Processing of transparent plastics produces birefringent stresses-optical effects. Its tensile strength is 3.52-6.33MPa, its bending strength is 6.12-9.84MPa, and its thermal deformation temperature is 70 ° C-98 ° C. The chemical properties of polystyrene are resistant to certain mineral oils, organic acids, alkalis, salts, lower alcohols and their aqueous solutions. It is softened after being eroded by hydrocarbons, ketones, higher fatty esters, etc. It is soluble in aromatic hydrocarbons and toluene, ethylbenzene and styrene monomers. In some cases, the degree of erosion of polystyrene by chemical reagents can be reduced by annealing, stress relief and other measures. Soft plastic stereo grating. The main use of PVC film base through the metal grating drum or grating plate into soft plastic three-dimensional grating. Polyvinyl chloride is a polymer compound formed by polymerizing chlorinated olefins and is difficult to burn. Although polyvinyl chloride and polyethylene are both milky white, polyvinyl chloride can be made into a colorless, transparent and shiny film, and can produce various softness films according to the content of plasticizer. This material is also fast after pulse heat sealing, high frequency heat sealing and adhesion. The chemical properties of PVC have good chemical resistance, but poor thermal stability and light resistance. Hydrogen chloride begins to decompose at 140 ° C, and stabilizers need to be added during manufacturing. Polyvinyl chloride has a chlorine content of 56% -58%, and it is easily soluble in ketones, esters and chlorinated hydrocarbon solvents with low molecular weight. High molecular weights are difficult to dissolve.
(2) Paper.
Printing paper is required to have the characteristics of compactness, smoothness, smoothness, and small stretchability; usually coated paper or cardboard is used.
(3) Adhesive.
The role of the adhesive is to enable the printed matter and the grating to be firmly pasted together; secondly, it can protect the ink layer from discoloration at high temperatures. Three-dimensional printing should pay attention to the following issues: single-lens camera or multi-lens camera is used for photography, which requires the camera to have high accuracy to avoid errors caused by vibration. And accurately adjust the focal length, angle and raster data movement spacing; improve the accuracy of color separation and copying of the plate making, 300-line dots are required to be solid, and the scene image maintains a rich level; color printing must be produced as planned to avoid The paper is stretched, resulting in inaccurate overprinting; the spacing and angle of the grating have high precision, and the composite molding requires accurate positioning. Hard plastic and soft plastic have better transparency performance.
(4) Ink.
At present, some ink manufacturers can provide inks and additives suitable for three-dimensional (three-dimensional) printing, and some manufacturers have developed new ink production lines. However, it should be noted that the three-dimensional printing ink is not a foaming ink. In fact, any visible degree of foaming will affect the clarity and three-dimensional effect. The curing temperature of 3D printing inks is within the curing range of standard plastic inks (149 ° C-171 ° C), but it must be increased to the curing temperature suitable for ultra-thick ink layers. If the ink layer is fully cured, the three-dimensional ink will have the same elasticity as the standard plastic ink. Although 3D printing inks are not yet common, this ink is very different from the thicker plastic ink layers that people commonly see. If the operation is carried out correctly, the three-dimensional printed image will have sharp subtle levels and clear edges, the printed edges will protrude vertically from the fabric surface, and the ink wall will be very smooth. Although this ink is very thick and the ink plate is very thick, 3D printing can still print exciting subtle levels and screen prints.
Picking up fruit and vegetable is also a knowledge to learn. Some fruit and vegetable are better handled, while others require peeling, nuclear work, etc., which is more troublesome. So they will require some tools to help.
The use of these tools to deal with the fruit and vegetable, in addition to the convenience, and more importantly, the powerful processing function, allows us to have more space to eat the fruit and vegetable, let it no longer limited to eating directly or cutting fruit and vegetable.
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