Adhesive system is very important part of an automatic flat screen printing machine. When fully automatic flat-screen printing machines were first introduced, it was quite common to combine the fabric to be printed with a back-grey, especially if the GSM of fabric was low. As adhesives and way of printing of their application were improved, this practice of printing became less important. The method of automated printing then became established, and which is still in use in many plants, is to apply a liquid-based adhesive to the blanket at the entry end, by means of a brush running in a trough containing the adhesive solution, and to spread the layer more evenly with a rubber squeegee; the textile material is then pressed against the tacky blanket with a pressure roller. A hot-air dryer is sometimes employed to dry the adhesive before the material is printed by automatic flat screen printing machine.
The available as another chose of the continuous application and removal of aqueous adhesive is the use of a tacky semi-permanent or ‘permanent’ adhesive on the blanket. Such adhesives, often based on acrylic co polymers, can withstand the washing necessary to remove excess print paste without becoming detached from the blanket. Their permanence is limited, however, replacement being needed after perhaps two weeks’ printing, and permanent thermoplastic adhesives have proved more satisfactory. These adhesives are coated on to the blanket and are only tacky when heated. Heat can be applied either directly to the adhesive layer or to the textile material, in order to achieve the required bond. Such thermoplastic adhesives often remain serviceable during the printing of several hundred thousand meters of textile material.
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The available as another chose of the continuous application and removal of aqueous adhesive is the use of a tacky semi-permanent or ‘permanent’ adhesive on the blanket. Such adhesives, often based on acrylic co polymers, can withstand the washing necessary to remove excess print paste without becoming detached from the blanket. Their permanence is limited, however, replacement being needed after perhaps two weeks’ printing, and permanent thermoplastic adhesives have proved more satisfactory. These adhesives are coated on to the blanket and are only tacky when heated. Heat can be applied either directly to the adhesive layer or to the textile material, in order to achieve the required bond. Such thermoplastic adhesives often remain serviceable during the printing of several hundred thousand meters of textile material.
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