Process for producing tack-free hotmelt material and device for producing the same
AssigneeOrganik Kimya Sanayi Ve Tic. A.S.
InventorsViktor Benbanaste, Filiz Öztürk, Oguzhan Calik, Mahmut Alper Er
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Abstract
The present invention relates to a process for producing a hot melt adhesive (HMA) material, preferably hot melt pressure sensitive adhesive (HMPSA) material, having a substantially tack-free coating comprising a novel moulding and spraying step, wherein said HMA material, preferably HMPSA material, can be easily handled, packed and transported for further use. In addition, the present invention relates to a corresponding device for producing a hot melt adhesive (HMA) material, preferably hot melt pressure sensitive adhesive (HMPSA) material, having a substantially tack-free coating.
Claims17
A process for producing a hot melt adhesive (HMA) material having a coating, wherein the coating has a tack-free property up to 50° C., the process comprising:
- moulding cold HMA granules into a solid, moulded block of agglomerated HMA granules, wherein the moulded block of agglomerated HMA granules has a truncated cone shape;
- and
- a liquid or molten coating material at least partially to top, bottom and lateral surfaces of the moulded block of agglomerated HMA granules,
- wherein the surfaces of the moulded block of agglomerated HMA granules are continuously coated with the coating material while the moulded block of agglomerated HMA granules is being rotated.
A device for producing a hot melt adhesive (HMA) material having a coating, wherein the coating has a tack-free property up to 50° C., the device comprising moulding means for moulding HMA granules into a moulded block of agglomerated HMA granules, wherein the moulded block of agglomerated HMA granules has a truncated cone-shape, and spraying means for applying a coating material present in liquid or molten form at least partially to a surface of the moulded block of agglomerated HMA granules present in solid form,
- wherein the moulding means comprises a mould having an open top and an open bottom, a movable disc forming a bottom lid and a movable compressor/extractor disc for compressing the HMA granules from the top of the mould in a state in which the disc closes the bottom of the mould while it is being filled and for moving the moulded block of agglomerated HMA granules present in solid form through the bottom of the mould via the pressure of the compressor/extractor disc, wherein the inner diameter of the bottom of the mould is larger than the inner diameter of the top of the mould.
Dependencies are inferred from the claim text.