Precautions for using water based adhesive
Time：2013/09/18 8:44:58 Hits：1991
Water-based adhesives , the main purpose is to reduce the transfer of aluminized , shorten delivery cycles. Through a long period of use, we summed up some experience for your reference: Compared with solvent-based adhesives , water-based adhesives Although the operation is relatively simple, but also pay attention to control some aspects .
( 1 ) the water-based adhesive in a small amount of glue , the rubber roller must select lines and shallow dense laser engraved roll , typically 200 lines / 35U, the shape of a mesh opening of roller laser is relatively large, it will ensure that water better adhesive transfer to the film .
( 2 ) water-based adhesive prior to use water-based adhesive in the tub must take slowly for 5 to 10 minutes , to ensure a variety of additives in a water-based adhesive mixture. Best to use special glue water circulation pump .
( 3 ) to be detected before the glue film on the surface tension dyne detection tools best solution instead dyne pen , the surface tension of the film at least more than 3.8 × 10-2N / m, the ink surface must testing. ( The surface tension of the ink is not greater than the glue surface tension in the composite transparent ink, the problem encountered .
( 4 ) Whenever possible, use the reverse rotation roller leveling . Reverse flattening roller great influence on the apparent , by adjusting the speed, you can achieve the best results so apparent .
( 5 ) Set the oven temperature to 80 ℃, 85 ℃ or 95 ℃ ( temperature to the set temperature only after boot ) . Because wind drying for water-based adhesive is very important, so the oven inlet and exhaust to be maximized . Composite heat drum temperature is set to 75 ~ 85 ℃, composite heat drum set to the maximum possible pressure .
( Note: For the temperature setting , in considering the affordability of film and process the case to be recommended to operate according to the above conditions . )
( 6 ) on the plastic tank and water-based adhesives must be used between the air diaphragm pump barrel , clean the pump before use , can not be mixed with the solvent . Best used filter.
( 7 ) In order to prevent blocking the version, release the blade must be shut down , and make the rubber roller soaked in water-based adhesive to keep turning.
( 8 ) To prevent the machine speed is too high will produce bubbles , you can put a uniform ink stick in plastic tank .
( 9 ) After use , wipe the rollers with water on the water-based adhesive , and then do a thorough cleaning of ethyl . If the resulting blocking version , you need to use MEK cleaning .
( 10 ) Water-based adhesive storage temperature not lower than 5 ℃, not in the sun exposure, can not be dirt and solvent contamination. The remaining glue used within 24 hours if possible , to pay attention to good seal .
( 11 ) If the scratches apparent phenomenon , generally there are two reasons: First, not clean spatula , scrape caused lock phenomenon, then to clean up the blade ; Second, blocking version , this time to clean up version of the roller.
Because water-based adhesive film works by sticking together the two films , so its effect is very stable compound , produced by the product immediately cut. If due process or a composite substrate causes of poor quality , you can also see the next machine the first time out , not in mass production after the discovery of the problem .
Four: the development of existing water-based adhesive : water-based adhesive for more functionality will be available .
Most companies now on the market to use, is a single component water-based adhesive , mainly for light packaging aluminum structure , in order to expand the use of water-based adhesives and some leading technology companies in recent years focused on the development of the dual group of water-based adhesive , that is, by a crosslinking , so that plastic heat and chemical resistance are greatly increased , greatly improving the peel strength of the composite and heat seal strength . Rohm and Haas is currently used as the U.S. broader L-80D, L-260A, L-95D ( transparent composite structure classes can be used to glue ) . In recent years, there are many excellent domestic enterprises by foreign investors or their technical research strength , but also the emergence of a water-based glue domestic producers , but the overall quality and stability , domestic water glue producers compared with other countries , and its mature technology, innovation need to be further improved.
