Self-adhesive label material is also called self-adhesive label material. It is a composite material with paper, film or special materials as the fabric, adhesive on the back, and silicone-coated protective paper as the base paper. Due to the variety of coating technologies, self-adhesive materials are formed into different grades. The current development direction is from traditional roller coating and blade coating to high-pressure cast coating to ensure the coating to the maximum extent. Uniform sensitivity, avoids the generation of bubbles and pinholes, and ensures coating quality. However, the domestic technology of cast cloth coating is not yet mature.
Self-adhesive production process:
1. Whether the screen printing plate and ink used meet the requirements of the production subpoena or process card;
2. Screen printing Whether the quality meets the quality requirements for printing use
3. Check the surface quality of the self-adhesive material while counting points. After the inspection is correct, fix the screen and adjust the screen distance, and then use self-adhesive positioning materials for positioning. At this time, the position of the printed pattern must be determined strictly according to the positioning frame. The three positioning pieces are located 1?/? of each positioning edge. At 3?, the size of the positioning piece is specified as 1?cm? Before the first product is printed, it must be printed on plate paper. After the first single-color printing is completed, it must be confirmed by the quality inspection personnel. The words "Agree to Print" and signature must be signed on the color sample of the first product; during formal printing, it must be done one by one. Compare and check with it. If any abnormality is found, appropriate adjustments should be made, such as adding thinner, adjusting the angle of the scraper, replacing the ink, etc. For products that require precision, the surface of the self-adhesive material must be wiped with an anti-static brush, a static rag or a non-woven cloth dipped in alcohol before it can be printed. According to the printing quality inspection standards, each printing machine is used as a preliminary self-inspection unit, and qualified products and unqualified products are strictly separated and placed during the printing process. ?When printing transparent self-adhesive materials?, a car body color test must be done, and printing can only be done after passing the test. ?After printing, for self-adhesives printed with Japanese Seiko inks, the drying rack should be pushed into the drying room, the temperature is set to 45~50℃, bake for 20~30min, and then pushed out of the drying room to dry naturally. ; After printing other types of inks, they must be allowed to dry naturally indoors for 24 hours before being stacked. Otherwise, they must be placed vertically; for overprinting of more than two colors, the color registration interval should be controlled to more than 30 minutes. When collecting printed matter from the drying rack, ensure that the positioning edges are consistent without scratches or wrinkles; for unqualified products, mark the corresponding parts with "×" marks on the bottom paper; use laminated paper strips to distinguish them Count the quantities of qualified products and non-conforming products, and fill out the production subpoena.
4. Mold making and die-cutting process? The design department will make the die line pattern of the final product according to the drawing requirements and hand it over to the die maker. After checking it, the pattern will be pasted on the 5 mm? On the thick plastic board, use a sawing machine to cut out the graphic outline according to the die line, and the edges are required to be even and smooth. Use a knife molding machine to embed the daily 0.45 mm × 9.5 mm blade in the gap between the knife mold lines, and then use self-adhesive glue to manually press and cut the tangent line, and check the size of the tangent line. Whether the edge is rounded or not, it is required that there is no gap or misalignment at the blade interface, and it must be inspected and confirmed by the quality inspection personnel, and the mold confirmation report form must be filled out. After the knife template is made, use foam glue to stick it to the blade surface to protect the knife strip from damage. Finally, mark the product name, production date, and producer on the knife template, and hand it over to the die-cutting personnel. ?Die-cutting personnel first check the quality of the knife templates. After confirming that they are correct, they number them and record them in the knife template ledger in a timely manner. The principle is: all knife templates are arranged according to the customer's name, and each customer's? All knife templates are sized according to the drawing number. Arrange without missing any parts, which makes finding the knife template accurate and time-saving. When receiving semi-finished products from the printing process according to the production subpoena, the quantity must be counted, qualified and unqualified products must be distinguished, and the surface of the semi-finished products must be checked for scratches, whether the positioning edges are placed consistently, and mutual inspections must be carried out. ?Find the knife template according to the production voucher and the knife template ledger, install it on the die-cutting machine, adjust the pressure according to the requirements of the product (half or full break), adjust the spacing from large to small, and determine the die cutting according to the original printing positioning position.
?During the die-cutting process, self-inspection is strictly carried out in accordance with the die-cutting quality inspection standards. The ratio is 1?0? to distinguish qualified products from unqualified products; according to the counter display, each die-cutting is 100 pieces, separated by bottom paper. Finally, place the semi-finished products area and fill out the production summons. ?Put the used? knife template back to its original place. If any problem is found, fill in the repair form in time and return it to the knife mold making process. After each die-cutting is completed, the die-cutting date, die-cut quantity and number should be marked in the knife template ledger. Knife template? Quality condition. For self-adhesive labels that require crystal glue, please continue with the following steps.
5. Inspection stage before drop molding? The organizers go to the die-cutting process to receive semi-finished products according to the production subpoena. They need to count the quantities and distinguish qualified products from unqualified products. Check the quality of die-cut semi-finished products according to the quality inspection standards while discarding them, distinguish the qualified products from the unqualified products after inspection, and mark them with laminated paper strips for the next process; if they need to be repaired, fill in the repair form and return the relevant processes.
6. Plastic dispensing process? It is prohibited to use substandard products for plastic dispensing. Before the plastic dispensing operation, the workbench should be adjusted to make it level, and the semi-finished product should be pasted on the glass plate without problems such as bubbles or improper pasting. The pasted glass plates should be stacked accordingly, preferably no more than 1?0? layer. ?According to the requirements of the process card or drawing, use the corresponding crystal glue and operate according to the following corresponding processes: ?① Domestic glue dispensing personnel strictly follow the glue dispensing operation manual. The glue dispensing personnel will prepare and remove bubbles of crystal glue drops. On the pattern, drop one plate to cover the other to prevent dust and debris from falling on the surface. After dripping 3?~4? plates, check the first plate to determine whether the amount of glue needs to be increased or decreased, and trim it with silicone oil base paper so that the crystal glue flows to the edge of the pattern. Do not damage the printing surface during trimming. The thickness of the glue is average. Controlled at (2?±0.2)?mm. ?②Imported glue? The operation of imported glue dispensing is as follows. 1. Process flow: feeding - vacuuming - cleaning machine - foam removal - glue dispensing - repair - sealing. Operators must operate strictly according to the process requirements in the drip molding machine operation manual and the table above. 2. Before dispensing, set the proportion strictly according to the process conditions, and the error shall not be greater than 2. 3. The interval between dispensing shall not exceed the alarm time. If the alarm time is reached, the dispensing shall be carried out as soon as possible. ?Process and Technology 2006.3?Screen printing. 4. The amount of glue dripping shall not fluctuate greatly, and the thickness shall be controlled at (2?±0.2?)mm. 5. When trimming after dispensing glue, do not damage the surface of the printed matter to cause ink to fall off or bubbles to appear. After the glue dispensing is completed, cover the top with an empty glass plate, wrap it with silicone paper, and mark the operator's name, date, time, and ticket number. 6. After the work is completed, thoroughly clean the machine and mixer with methylene chloride. When cleaning, operators need to wear protective masks. If solvent splashes on exposed parts of the body, rinse immediately with plenty of water.
7. Sorting process? Sorting personnel go to the upper process to receive semi-finished products, count the quantities, and distinguish qualified products from unqualified products. For products that require lamination, select and receive a composite film or transfer film with appropriate viscosity according to the drawing requirements. Pay special attention to the fact that the film must not exceed the positioning edge of the self-adhesive material when laminating. ?When removing waste from half-cut products, the surface must not be damaged. While removing waste, inspect each piece one by one; if it needs to be repaired, fill in the repair form and return it to the relevant process. ?For products that have been molded and dried thoroughly, inspect them according to the molded product quality inspection standards to distinguish between qualified and unqualified products. ?For products that need to be spliced, they should be spliced ??with molds according to the drawings and customer requirements, and the dimensional error should be controlled within 2 to 5 mm. ?Quality inspection personnel conduct random inspections of final qualified products and fill out product inspection reports. Packaging is carried out according to the customer's requirements, and the qualification seal and inspector's seal must be stamped, and the date, product name, and quantity must be marked. Packing and storage are carried out. The production department and warehouse management personnel go through the procedures for entering the finished product warehouse. The organizer fills out the production subpoena, in which the sum of the quantity of qualified products and unqualified products must be consistent with the quantity of blanking materials in the blanking process; if there is any inconsistency, the reason must be identified and marked in the remarks column for reference by the statistician. .