Abstract:
In a powder quantitative supply apparatus according to the present invention, fluidizing air is blown from a controller 28 into an air chamber 13 of a pressurized powder hopper 11 to maintain a powder coating material F in a fluidized state and pressurize the inside of the pressurized powder hopper 11. In a state where the outlet portion of a screw feeder 14 and the inside of the pressurized powder hopper 11 are mutually kept at equal pressures through an equalizing line 20, a drive current is supplied from the controller 28 to a motor 18 and transport air is supplied to a pressure-feeding nozzle 19. Thus, the screw of the screw feeder 14 rotates so as to discharge the fluidized state powder coating material F from the inside of the pressurized powder hopper 11 to be guided to the pressure-feeding nozzle 19. The powder paint is thus sprayed from the pressure-feeding nozzle 19 to an object to be coated by the transport air.
Abstract:
Methods and apparatus are disclosed for spraying powder into the interior of welded hollow can bodies from a spray gun mounted to the welding arm of a can forming machine. The spray gun can either apply a stripe of highly charged powder on the welded seam areas of hollow can bodies, or can simultaneously apply a coating of powder having a first thickness on the longitudinally welded seam areas and a second thickness less than the first thickness on the remainder of the interior surface. Air is vented off from the powder flow being transported through the welding arm so that the powder to air ratio is increased. Air is introduced at the downstream end of the welding arm to provide a suction force to help draw the powder flow through the welding arm and to increase the velocity of the powder flow for better tribo charging of the powder in the gun and to improve spray pattern stability. A flow of cleaning air through the powder spray gun prevents powder from collecting on the front surface of an offset nozzle secured to the spray gun. The gun assembly is affectively grounded to prevent arcing, and has an exterior shape which has been geometrically configured to improve powder coating of the can. A collector hood surrounds an input conveyor on which cans are transported while being spray coated and an output conveyor which removes the cans at a higher speed than at which they traveled on the input conveyor. The collector hood has two operating conditions for collecting oversprayed powder from between the cans during the spraying operation or directly from the gun when the cans are not being sent down the line.
Abstract:
The powder paint feeder for powder coating directly is installed to a powder paint tank of a fluidized bed type. In the powder paint feeder, a cylindrical screw casing is inserted into the powder paint tank and fixed thereto and has an introducing port into which the powder paint fluidized in the powder paint tank is introduced and a discharging port through which the powder paint dispersed externally of the powder paint tank is discharged. A screw is accommodated in the screw casing and feeds the powder paint introduced from the introducing port to the discharging port while compacting it. A deaerating device is disposed to the screw casing and deaerates the fluidized powder paint to accelerate the compaction of the powder paint. A dispersing blade is mounted on the rotational shaft of the screw in the vicinity of the discharging port downstream of the screw for dispersing the compacted powder paint. A driving device rotates the rotational shaft of the screw. The powder paint feeder for powder coating is less expensive and arranged such that it can feed the powder paint with an excellent constant quantity feeding property without being affected by the powder level in a tank and can be washed easily and efficiently.
Abstract:
An apparatus and method for use with powdered resin feeders that provide a continuous stream of powder to a plurality of spray nozzles for the application of powder to a plurality of work-pieces. In one preferred embodiment, the apparatus converts a single powder stream into a plurality of uniform powder streams through the use of a multi-tiered system having dividers and receptacles that accurately divide a single powder stream into a plurality of powder streams. In another preferred embodiment, a double-ended stud having ends with differing break-away torques may be created by the device's ability to distribute different amounts of powder to the spray nozzles.
Abstract:
An apparatus and method of use for spraying powder on substrate which is particularly suited for use in conjunction with a printing press for automatically applying a fine powder onto printed sheets prior to delivery to a stacking station. The electrically controlled and motor driven apparatus comprises a pressurized air source, a powder hopper with a powder agitator contained therein, a brush unit which transfers powder from the powder hopper and, through the use of a flicker bar, mixes powder with air to create an air and powder mixture in a powder chamber. Pressurized air passing through a venturi upwardly vacuums this mixture and propels the air and powder mixture through a selectable series of pneumatic hoses to nozzles with an adjustable width of spray for spraying powder on printed sheets.
Abstract:
A powder supplying apparatus supplies, for example, a powder spraying apparatus with fine powder particles such as of ceramics having particle sizes of several .mu.m to 10 .mu.m at an extremely small rate of several grams to several tens of grams per hour, in the form of micronized discrete particles dispersed at a high degree of uniformity. The powder spraying apparatus is capable of spraying the fine powder particles on an object surface with a high degree of uniformity of distribution. The disclosed apparatus is used typically in uniformly spraying the above-mentioned fine powder particles which serve as spacers between a pair of transparent substrates of a liquid crystal display panel, for the purpose of maintaining a uniform and constant gap to be filled with a liquid crystal between these transparent substrates.
Abstract:
An improved powder particle supply and transport apparatus and method include a hopper filled with powder particles, an ejection chamber spaced from the hopper and a movable conveying member with a plurality of cavities formed therein. During operation, the conveying member moves the cavities between the hopper and the chamber, and the cavities are filled with powder particles at the hopper and emptied of powder particles at the chamber. An ejector nozzle sprays pressurized air into the chamber toward an aligned outlet, thereby to: 1) create negative pressure in the chamber to draw powder particles from the cavities as the cavities are moved therethrough; and 2) transport powder particles through the outlet to a spray gun. Additional structure may be used to assure complete powder filling of the cavities at the hopper and/or complete powder emptying of the cavities in the chamber. The invention achieves supply and transport of uniform and stable quantities of powder particles to a spray gun, even over very small units of time, regardless of powder particle size and/or cohesive properties.
Abstract:
A method of spraying a powder onto a substrate includes the steps of mounting the substrate in a fixed position; mounting a spray nozzle such that an outlet end thereof confronts the substrate; moving the spray nozzle such that a locus on the spray nozzle moves along a zig-zag pattern; and spraying the powder from the spray nozzle onto the substrate during the movement of the spray nozzle. The step of mounting the spray nozzle includes mounting the spray nozzle to a first oscillation link, and mounting the first oscillation link to a reciprocable slider. The step of moving the spray nozzle includes oscillating the first oscillation link relative to the slider, and reciprocating the slider during oscillation of the first oscillation link. The step of mounting the spray nozzle further includes mounting the slider to a second oscillation link. The step of reciprocating the slider includes oscillating the second oscillation link about a pivot point. The step of oscillating the second oscillation link includes positioning a revolving member in a slot formed in the second oscillation link, and revolving the revolving member. The step of oscillating the first oscillation link includes positioning a further revolving member in a slot formed in the first oscillation link, and revolving the further revolving member.
Abstract:
A method for applying particulate powder material to a moving, pre-formed, fibrous substrate. In this method, particulate powder material is entrained in a continuous airstream. The air-entrained stream of particulate material exits a nozzle to be applied to the substrate or recirculated. The stream of air-entrained particulate matter has a velocity component in the direction of movement of the fibrous substrate.
Abstract:
An apparatus for the entraining of powdery materials in a gas stream consists essentially of two sets of rotatable horizontal vanes disposed vertically of each other and separated by a horizontal partition. Powdery material arriving at the upper set of vanes is pushed around to a communication conduit in the partition through which it falls to the lower set of vanes. These move the material around to an exit conduit whose cross section does not overlap with that of the communication conduit when the apparatus is viewed in plan. The material falls into the exit conduit to be entrained in a gas stream. Preferably the gas stream enters the apparatus adjacent to the exit conduit.