Developments in Roll Spreading Techniques

This article describes the use of the adhesive spreader for applying various adhesives to many different substrates. Explanation is given showing that while softer durometer gluing rolls, can better conform to irregular stock surfaces, because the roll is softer, the grooved pattern cut into the roll is not so stable as it is on harder durometer rolls. Where stock uniformity is a major problem, the use of a double sleeve or cushion roll consisting of a hard outer sleeve over a soft inner core has advantages since the hard outer sleeve can be grooved to control the glue spread while the soft inner core will give with the highs and the lows in the stock. Also discussed are roll grooving, buttress grooving as it is used for applying adhesive to veneer for plywood manufacture, and a modified “V” groove as it is used for applying adhesive to rigid stock surfaces such as particleboard. In general, the coarser grooving, ie., fewer threads per inch, gives heavier glue spread than the finer grooving.

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