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Фрагмент инструкции
Clay and ink affect this bond. While good adhesion occurs between molten adhesive and ink or clay, poor adhesion may exist between ink or clay and its parent paper. Accordingly, the lamination process will be adequate, but the overall laminate may lack some integrity. Some paper and card stocks are coated with silicones, wax, or varnish which inhibit the ability of molten polyethylene to stick tightly to individual paper fibers. In such cases, a superficial bond develops which may be adequate, depending upon intended use of the finished laminate. Smooth surfaces, especially photographic, metallic, and plastic, are difficult for polyethylene to bond to, since no fibers are exposed for the adhesive to contact. Again, a superficial bond develops which may be adequate but which does not have the same integrity as when bonded to typical office paper. Product containing moisture will not laminate well since the fluid converts to steam, forms bubbles, and impairs lamination. 2. At the moment of lamination, the product-poly-ethylene interface—both top and bottom—must reach a stick-seal temperature of at least 210°F. (99°C.). All GBC laminators intended for polyester-poly-ethylene films are factory adjusted to produce not less than 210°F. (99°C.) at product-film interfaces with typical 20 lb. (75.2 g/m2) paper on a continuous laminating basis. Superficial bonds develop at lower temperatures, and the finished laminate may be adequate for its intended use. However, the ultimate in integrity requires 210°F. (99°C.). A user can check bond by separating film from product and noting whether fibers stick to the polyethylene. If fibers are removed, the bond between paper and polyethylene is likely to be as good as is technically possible to achieve. If no fibers are removed (and no doubts exist with respect to bondability as described in Section 1), a thermostat adjustment-increasing heat roll temperature—may rectify the situation. Thickness of the product bears heavily on the ultimate integrity of the bond, since the thicker a product, the more heat is extracted from the heat rolls—which tends to lower temperature below the critical 210°F. (99°C.). GBC laminators are capable of running continuously at not less than 210°F. (99°C.) interfacial temperatures with typical office paper whose thickness varies from 0.0035" (.09 mm) to 0.005" (.13 mm). Thicker product may extract heat faster than the machine can put heat in, and after 20 feet (6.1 m) or so, the interfacial temperature may drop below the critical point. Generally speaking, most card stocks whose thickness is on the order of 0.012" (.30 mm) thick can be laminated on a continuous basis. 3. Total encapsulation of product, with a complete film-to-film border, is often recommended to prevent an otherwise successful laminate from splitting or separating within itself. Total encapsulation of a product, of course, prevents splitting from casual abuse of a corner or edge of the laminate, and obviously, moisture vapor or liquid cannot enter to weaken the laminated product. Flush cutting of laminated product, or even slightly into the product, yields a neat, trim appearance but renders the product sensitive to splitting at the edges, and particularly at corners. The split occurs within the product and not at the adhesive-product interface. Flush cutting also leaves a paper edge exposed to the atmosphere and any moisture vapor it contains. However, this may be of little consequence unless the laminate is exposed to an actual liquid, whereupon the fibers within the product loosen from one another and splitting occurs. Machine Care and Precautions 1. Only use threading knob initially when threading laminator. Do not rotate knob once film is engaged in pull rolls. 2. During each use, check ejection slot to ensure film exits properly. 3. When leaving laminator in heated condition, but not running, for any great length of time, insert paper or card stock into machine, letting it protrude from entrance and exit slots. 4. Avoid touching heat rolls when in heated condition. 5. The heat and pull rolls should be kept reasonably clean of polyethylene which has oozed out from film edges during lamination. Accurate alignment of top and bottom film webs will minimize this problem. To clean heat rolls, disconnect power cord and allow heat rolls to cool slightly. Swing interlock safety shield up and out of the way. A light deposit of polyethylene can be removed with an ordinary rubber eraser. Heavier accumulations require use of a green Scotch Brite pad. Rub rolls lightly until the polyethylene balls up and can be brushed or blown away. DO NOT USE A SHARP CUTTING EDGE TO TRIM OR SCRAPE THE ROLLS. 6. Two (2) thermostats are used to control operation of the laminat< mounted independently. The right thermostat (as viewed from rear of laminator) con roll temperature and may be adjusted with a small screwdri crease or decrease temperature according to direction indi nameplate. A...
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