With the continuous development of the label printing industry, it has evolved from the former common job to color multicolor, and the adhesive printer has also turned from single sheet to automatic web color printing. There are two kinds of processes for the adhesive printing machine printing plate making: Flat and flat. Flattening and flattening can be used for hardwood and soft substrate (polyester substrate) in the choice of plate material, but can only use polyester plate material for round platen in order to achieve the best printing effect. . The following describes the resin plate making process.
First introduce the equipment for plate making. The resin platesetter consists of four systems: exposure, vacuum, plate washing, and constant temperature drying. The light source of the plate making machine is usually a side-by-side black light lamp group, and its light source output power is around 360 nm. The purpose of the vacuum in the plate making machine is to allow the film and plate to fit tightly, and the exposed resin plate will not be distorted. The platesetter plate washing system is composed of a stainless steel washing tank and a soft and hard-appropriate brush and motor. Bi-directional plane rotation. The drying oven of the plate making machine requires uniform heating, good circulation, and automatic thermostat device to avoid overheating.
1. Film production
The film production is photographed with a camera, or typeset with a computer, and a laser image-setter is used to print. It is common to use a negative image, which is a positive image (negative film). The density of the light-transmissive part of the film is less than 0.05, and the density of the light-shielding part is greater than 3. If it is lower than this standard, it will cause the exposure of ultraviolet rays to penetrate the film and cause the part of the graphic text to not flush. Do not crease the film. Color network cable jobs usually use electrical extensions, or laser imagesetters, to produce films.
2. Platemaking process
(1) Exposure
First, the plate is cut according to the size of the film, the plate is preferably larger than the film 2-3mm, the vacuum film must be cleaned, if there is dust and stains, the application of anhydrous ethanol to clean. The protective film on the plate is peeled off so that the film surface of the film and the film film of the plate face each other. Vacuum adsorption is turned on to queue the air between the film and the plate. Set the desired exposure time. (This time is determined by the light source intensity of the platesetter and the font size of the plate. If a plate has both large and small fonts, the exposure time should be determined separately: Large words have a short exposure time, small words and fine lines have a long exposure time. The large part is masked with a mask and the vacuum pump cannot be closed to prevent it from drying out.
(2) Flushing
The smeary plate is affixed to the rinsing automatic plate with double-sided adhesive, and the bidirectional automatic rinsing is performed. The stencil is washed to the base layer of the plate (rinsing water must be filled in the rinsing tank before rinsing, and the rinsing temperature is set).
(3) Drying
The washed plate is sucked with a sponge to remove the floating water on the surface of the plate, and placed in a drying oven for drying. The temperature is generally set between 60-70°C. The time is 10-20 minutes.
(4) After exposure
After drying, the plate should be exposed again, so that the photo-sensitive and incompletely cured part is completely cured in this process, so that the plate material can reach the required hardness standard.
The above plate-making process is a plate-making method for a flat pressurizing resin plate, and a hard-base domestic plate is used as a resin plate. Of course, imported polyester version can also use this mode of plate making. The following describes the round flattening polyester version, which is the plate making process of fully automatic label printing.
The process of making round flattened polyester version and flat pressed flat resin version mainly differs in equipment. A roller type rotary exposure machine for producing a round flattened polyester version uses the diameter of the exposure roller according to the drum diameter of the fully automatic sticker machine. This plate-making machine rotates the drum for exposure, and the lamp is placed in an arc shape. After the film is prepared, the cut plate is vacuum adsorbed on a circular roller. After exposure, the exposure is completed. After the exposure is completed, the subsequent plate making process is the same as that of the lithographic plate making process.
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