Coating processes – Solid particles or fibers applied – Localized different areas produced
Patent
1987-08-24
1989-01-24
Beck, Shrive
Coating processes
Solid particles or fibers applied
Localized different areas produced
427282, 427424, 118301, 118308, 118325, B05D 112
Patent
active
048001023
DESCRIPTION:
BRIEF SUMMARY
This invention relates to an apparatus for and a method of applying a solid particulate powder material onto a substrate. In particular, the present invention relates to an apparatus for and a method of spraying a solid particulate powder material from a nozzle by compressed air or scattering a solid particulate powder material from a scattering port by free falling.
Where a solid particulate powder material is to be intermittently sprayed or scattered onto an elongated substrate running on a conveyer line, it has heretofore been accomplished by intermittently spraying or scattering the solid particulate powder material by a spray device.
Spraying or scattering the solid particulate powder material from the spray device as described above depends on a severe time of one several thousandth of a second along with the higher speed of the line, and this has required a higher degree of technique and at the same time, has encountered the difficulty that the profile of the pattern of spraying or scattering onto the surface to be coated is blurred.
It is a first object of the present invention to solve the above-noted problems and to provide a method and an apparatus capable of spraying or scattering a solid particulate powder material at a high speed by a simple technique.
It is a second object of the present invention to provide a solid particulate powder material spraying or scattering method and apparatus capable of obtaining a relatively clear-cut profile of spraying or scattering pattern.
It is a further object of the present invention to provide a solid particulate powder material spraying or scattering method and apparatus which readily enable any excess solid particulate powder material to be recovered and reused.
FIG. 1 is an elevational view illustrating the solid particulate powder material spraying method and apparatus according to the present invention.
FIG. 2A is a side view illustrating the solid particulate powder material spraying or scattering apparatus according to the present invention.
FIG. 2B is a plan view of the circular template portion of the apparatus of FIG. 2A.
FIG. 2C shows the spraying or scattering pattern on an elongated substrate to be coated on which a solid particulate powder material has been sprayed or scattered by the circular template of FIG. 2B.
FIG. 3A shows the spraying pattern on an elongated substrate to be coated on which groups having a plurality of different spraying patterns and pitches are sprayed at a predetermined pitch.
FIG. 3B is a plan view of a circular plate for the pattern of FIG. 3A.
FIG. 4A shows an example of a hollow pattern.
FIG. 4B is a plan view of a circular template for the pattern of FIG. 4A.
FIG. 5A shows an example of a continuous pattern.
FIG. 5B is a plan view of a circular template for the pattern of FIG. 5A.
Referring to FIGS. 1 to 2B, a rotary shaft 4 of a circular template or disc member 1 forming an essential portion of the apparatus of the present invention is supported by a bearing 16 on the frame 15 (only a portion of which is shown) of the apparatus and further, the shaft 4 is coupled to the shaft of a variable speed motor 5 by a coupling 19. In the circular template 1, a plurality of openings or cut portions 2A, 2B, 2C, . . . spaced apart from one another by a predetermined angle and each having a certain shape or profile are formed along a certain circumference C on the circular template. A rising marginal edge 3 is provided on the outer periphery of the circular template 1. The direction of rotation of the circular template 1 may be either, but in FIG. 1, it is a clockwise direction "S".
At the height "H" above a certain point Q on the circumference C along which said plurality of openings 2A, 2B, 2C, . . . of the circular template 1 are provided, a spray nozzle 6 having a slit-shaped opening for emitting or spraying solid particulate powder material of a linear pattern is provided in opposed relationship with the circular template 1. The nozzle 6 is so arranged that the lengthwise direction of the slit-shaped nozzle opening may b
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Beck Shrive
Nordson Corporation
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