Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B7/00—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas
  • B05B7/14—Spraying apparatus for discharge of liquids or other fluent materials from two or more sources, e.g. of liquid and air, of powder and gas designed for spraying particulate materials
  • B05B7/1404—Arrangements for supplying particulate material
  • B05B7/1468—Arrangements for supplying particulate material the means for supplying particulate material comprising a recirculation loop
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B12/00—Arrangements for controlling delivery; Arrangements for controlling the spray area
  • B05B12/02—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery
  • B05B12/06—Arrangements for controlling delivery; Arrangements for controlling the spray area for controlling time, or sequence, of delivery for effecting pulsating flow
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
  • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
  • B05B5/00—Electrostatic spraying apparatus; Spraying apparatus with means for charging the spray electrically; Apparatus for spraying liquids or other fluent materials by other electric means
  • B05B5/16—Arrangements for supplying liquids or other fluent material
  • B05B5/1683—Arrangements for supplying liquids or other fluent material specially adapted for particulate materials

Definitions

• Methods heretofore used as methods of inter- mittently applying solid particulate powder are of the electrostatic application type, the screen printing type, the roll type, the sprinkling type, etc., but any of these has suffered from the following disadvantages: (1) unclear outline of the applied pattern; (2) adherence of the solid particulate powder to unnecessary portions; (3) the use of masking and adherence of the solid particulate powder onto the masking; (4) reduced productivity; and (5) cumbersomeness of maintenance.
• Even the electrostatic application type which is said to be most excellent of the above-mentioned types has not been free from the disadvantage (1), that is, unclear outline of the applied pattern. Particularly in cord-like or band-like intermittent application, unclear lines of dissection have been a fatal problem to the end products.
• a pinch valve 116 On an air-transport pipe 114, a pinch valve 116 is provided immediately before a gun 101.
• the pinch valve 116 is such that the air pressure is increased or decreased from the outside of a resilient tube, that is, the resilient tube is pushed or released, to thereby open or close the interior thereof and open or close the path of the solid particulate powder passing through the tube.
• this valve When this valve is closed, it is usual from the structure thereof that the valve is closed while holding some solid particulate powder therein. Accordingly, it is difficult for the valve to be fully closed and even when closed, some air may flow.
• Figure 1 is a front cross-sectional view illustrating a gun unit according to the present invention.
• Figure 2 is a front cross-sectional view of a first Modification of the gun of Figure 1.
• I Figure 3A is a front cross-sectional view of a second Modification of the gun of Figure 1.
• Figure 3B is a side cross-sectional view of the second Modification.
• Figure 4 is a cross-sectional view of the electrostatic application nozzle of the Japanese utility model application as attached to the gun of the present invention.
• FIG. 6 is a block diagram of an apparatus using the gun of the present invention.
• Figures 8A and 8B are plan views showing the patterns of intermittent band-like coating provided by the gun with a flat nozzle according to the present invention.
• Figures 9A and 9B are plan views showing two examples of the pattern of multi-streak coating provided by the multi-gun unit of the present invention.
• FIG. 1 The structure of a gun according to the present invention is shown in Figure 1.
• a spout path 2 for a mixture PA of solid particulate powder and air (hereinafter simply referred to as the mixture)
• a connector 8 to a supply hose (or pipe) is attached to the entrance of the path 2 and a nozzle 5 is attached to the other end of the path 2.
• bypass 3 branching off from the spout path 2, that the bypass 3 is connected to an eject path 4 which is also provided in the gun 1, that an air ejector nozzle 6 is provided on the eject path 4 and that the end 6T of the air ejector nozzle is located substantially at the point of intersection with the bypass 3.
• the . spout path 2 and the eject path 4 are parallel to each other and the directions of these paths are opposite to each other, but alter ⁇ natively, as shown in Figure 2, the two paths may be parallel to each other and only the directions thereof may be opposite to each other (a first Modification), or as shown in Figures 3A and 3B, the two paths may be provided not in parallelism to each other, but with an angle " ⁇ " formed therebetween (a second Modification). In Figures 3A and 3B, the angle " " is 90 ° .
• Said sucking action also reaches the bypass 3 and the spout path 2 for solid particulate powder and thus, all the mixture PA_ of the passing solid particulate powder and air is sucked and discharged out of the gun 1. That is, the spout of the solid particulate powder from the nozzle 5 is interrupted. Subsequently, when the intermittent air opening-closing valve 72 is closed and the supply of the air A to the air ejector is interrupted, the aforementioned sucking action by the air -.ejector is interrupted and therefore, the aforedescribed original spout or spray of the solid particulate powder is restored and effected through the nozzle 5. That is, the intermission of the spout of the solid particulate powder from the nozzle 5 is accomplished by the intermission of the supply of the air to the air ejector.
• each nozzle can be operated singly to cause various patterns to appear as shown at "G” and "H” in Figures 9A and 9B.
• the spraying of the solid particulate powder from the gun can be intermittently accomplished by the intermittent operation of the intermittent air opening-closing valve for the ejector in the gun.

Landscapes

• Electrostatic Spraying Apparatus (AREA)
• Application Of Or Painting With Fluid Materials (AREA)
• Nozzles (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=12115092

Family Applications (1)

Country Status (5)

Cited By (10)

Families Citing this family (3)

Citations (3)

• 1986
  • 1986-02-05 JP JP2360086A patent/JPH0615050B2/ja not_active Expired - Lifetime
• 1987
  • 1987-01-30 CA CA000528597A patent/CA1285751C/en not_active Expired - Lifetime
  • 1987-02-04 EP EP19870901121 patent/EP0291534A1/en not_active Withdrawn
  • 1987-02-04 AU AU70203/87A patent/AU595870B2/en not_active Ceased
  • 1987-02-04 WO PCT/JP1987/000073 patent/WO1987004643A1/en not_active Application Discontinuation

Patent Citations (3)

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