automatic flexo printing die cutting slotting machine

1. A rural base layer that can be created based on back exposure facilitates obtaining the required relief patterns and improving the adhesion of the polyester support point film and the photosensitive resin layer. Proper back exposure from the polyester support point film orientation can maintain the micro pattern design of the version throughout the cleaning process and prevent the collapse of relief patterns.

2. After back exposure, the main exposure should be carried out immediately. Due to the specific light sensitivity, it will gradually fade, resulting in a longer main shutter speed and a weaker exposure sensitivity.

3. When the layer of the epoxy resin plate is torn off, the film should be immediately placed on the plate or subjected to primary exposure within a clock to obtain practical results.

4. The main shutter speed can be determined based on the main exposure detection. The photosensitive epoxy resin becomes insoluble based on the polycondensation reaction, and the printed version can reproduce the micro pattern design on the film. Before carrying out the main exposure, it is necessary to manually wipe the vacuum pump membrane to discharge gas to facilitate the sealing between the plate and the negative film.

5. The printing plate should be dry, otherwise it will harm the thickness uniformity of the printing plate. After drying, it is not necessary to let the printing plate touch the surface of other objects, and it is not necessary to touch the packaging printing surface with your fingers, otherwise there will be imprints. However, before debonding, remove the black spots on the surface of the printed plate. After debonding, it is necessary to remove residual black spots on the reverse side of the epoxy resin plate. If this item is not removed, it can harm the thickness uniformity of the printing plate and the adhesion of the plate mounting adhesive.

water ink printing slotting machine

When making epoxy resin plates, it often occurs that a portion of the thin wire frame is washed off or a portion of the embossed pattern on the negative image is too shallow. At this time, it is necessary to choose a processing process to achieve an ideal practical effect:

The “separated back exposure” processing process is selected. Generally, a flexible epoxy resin version with a thickness of 3.94mm is used for cartons, with a deep layer of 1.52-2.00mm in the text and graphics. The rural base layer is relatively thin, and small parts of the packaging and printing pattern design cannot bear basic exposure. At this time, it is necessary to select the “separate back exposure” processing process. First, determine the thin solid lines and text areas in the film, cut the mask into a regional contour template, first expose the back of the template to create all rural grassroots, then accurately position the mask on the surface of the polyester support point film according to the film label, and then conduct back exposure to create the rural grassroots in the desired area. The second back shutter speed is determined based on the thickness of the rural grassroots required.

Select the “main exposure mask” processing process. If the design drawing includes thin wireframe text and a negative image that is very easy to paste, then applying the mask processing process can achieve an ideal practical effect. The mask should be made of raw materials that are impervious to UV light. First, use a shorter main shutter speed that allows for deeper layers of the negative image to expose the plate, and then use a mask to cover a portion of the negative image and increase exposure to a portion of the thin wireframe.

Actual operation:

Ready, stick the dried epoxy resin plate onto a 4mm gasket, and then paste it onto the printing plate drum according to the specified specifications. Later, adjust the viscosity of the offset printing ink with industrial ethanol at a 1:1 ratio. Then, start the printing ink pump to apply ink, rotate the inking roller until the ink amount is uniform, check the ink amount, and ensure that the printing ink is evenly distributed on the inking roller with a faint pattern. At this time, start the trial printing, If the text and drawings are unclear and there is a leak, the working pressure of packaging and printing can be appropriately adjusted, and excessive pressure should be avoided to prevent deformation of the printing plate; If the text and graphics are unclear and the network lines are unclear, the ink amount can be reduced until the text and graphics are clear and the network lines are distinguishable, and the business outlets become invisible.

After a trial print is confirmed, it can be packaged and printed in large quantities. During normal packaging and printing, the speed should be balanced and maintained at 900~1000r/min. During the entire process of packaging and printing, attention should be paid to the ink volume and size, whether the business outlets are deformed, and whether there are dirty spots. It should be treated as strictly as offset printing, “Three levels at all times (ink coating roller level, printing plate roller level, and working pressure roller level), two levels (low ink volume, and low working pressure), and four levels (frequent inspection of samples, frequent mixing of ink barrels, frequent inspection of ink volume, and frequent plate wiping)” 。 Here, it is important to note that the plate can be cleaned with a thin cloth dipped in anhydrous ethanol. It is prohibited to use gasoline for vehicles, otherwise the epoxy resin plate will easily etch and deform. Use appropriate force when erasing the version, and do not use excessive force to damage the network cable. After wiping the plate, it should be continuously rotated for several circles, and then sent to cardboard packaging and printing after the printed plate is evenly coated with ink.

We also have other packaging machines: partition assembly machine china 、 semi automatic stitching machine for box 、 full automatic box stitcher machine 、 automatic box stitcher folding gluer machine 、 flexo ink sewage treatment clear equipment 、 paper angle edge corner making machine 、 air bubble film machine 、 printer die cutter slotter machine 、 hard paper board production line 、 EPE tube making machine 、 paper tube machine 、corrugated cardboard folder gluer machine and so on.

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Overseas manager: Tom Wang

Email:cartonmachine.tomwang@aliyun.com

Phone/Wechat/Whatsapp:+86 13303078975