Doellken ABS Edgebands can be processed on all edgeband machines (straight processing and machinery for curved pro les) using hot melt glue. Gluing, cross-cutting, milling, scraping and subsequent buffing with polishing wheels and hot-air dryers for high quality surfaces pose no problem. To ensure clean and durable edgeband application, certain salient processing para- meters should be followed which may be dependent on the materials used (edgebands, glue, boards), the edgeband machine and ambient temperatures. Trials to determine relevant optimal settings are therefore recommended. Manufacturers’ guidelines for an intended application should also be considered.
All conventional hot melt glues (EVA, PA, APAO, PUR) may be used on Doellken ABS Edgebands. The low-shrink raw material formulation of Doellken ABS, together with highly heat-resistant adhesives can guarantee reliable bonding even for edgebands thicker than 3 mm. Particularly heat-resistant adhesives are recommended for applications exposed to high temperatures, e.g. near kitchen ovens or for furniture exported in containers. Ensure that the glue hopper on the edgeband machine has sufficient glue to maintain a constant temperature during application. The glue application temperature will vary between 90°C and 220°C, depending on the type of adhesive. Please note that thermostats in hot melt hoppers are often inaccurate and may deviate considerably from the actual temperature on application rollers. It is advisable to measure the temperature on the application roller. Doellken ABS Edgebands cannot be glued using PVAC glue and the CA method.
Adhesive amounts to apply
Please follow the adhesive manufacturer’s instructions. Apply the adhesive evenly and in sufficient quantities for beads of adhesive to be pressed out along the edges of the freshly glued edgebands, ensuring that the spaces between board wood- chips will be filled. The amount of glue required depends on the density of the chipboard and the type of adhesive.
For best results fitting edgebands, work with boards and edgebands at room temperature (not below 18°C). Material stored outdoors should be warmed up overnight. Hot melt glue will cure before the edgeband is in place if the temperature of the board or edgeband is too low. Draughts should for this reason also be avoided.
The optimal moisture content of the boards should be between 7 and 10% for further processing.
The special Doellken ABS Edgeband raw material formulation is designed to suit feed rates required in both low and high volume processing. Depending on the edgeband gluing machine, speeds between 10 and 100 m/min. are possible. Speeds of up to 30 m/min. are also feasible on modern portal type machining centers, depending on the shape of the pro le to be processed.
Bearing in mind the machine parameters, ensure that an adequate number of rollers are available and adjust the pressure to achieve the best possible appearance of the joint.
Thermoplastic edgebands require higher extraction power than duroplastic edgebands. Doellken ABS Edgebands have the advantage that electrostatic charging is lower, compared to other thermoplastic raw materials.
If possible, use cutters with 3 to 6 teeth, with ca. 70 mm diameter and at speeds between 12 000 and 18 000 rpm. Incorrect speeds or blunt cutters may damage the edgebands. In the event of smearing, reduce the speed of the cutter or cut against the feed (increase feed, if necessary).
Since ABS colors tend to fade slightly after scraping, the plastic scrapings should be 0.1 to 0.2 mm thick at the most. To avoid chatter marks, the routers used for milling should be running true. Diamond coated cutters are recommended. Hot air blowers may be used for optimal scraping results where color shades are critical.
Buffing wheels are ideal for buffing the radii of Doellken ABS Edgebands. Any fading after scraping may simply be buffed away with these wheels, with the color of the radius then matching that of the edgeband itself. With through-feed edgeband machines, remnants of the glue may also be removed with the buffing wheel. Glue remnants may also be removed using electronically controlled release agent spraying units as is common in industry. This improves the scraper blade finish as well.