Method for gas-aided dispensing of liquid materials

Details Method for gas-aided dispensing of liquid materials Method for gas-aided dispensing of liquid materials

1990-12-21

1992-05-19

Lawrence, Evan

Coating processes

Nonuniform coating

Deforming the base or coating or removing a portion of the...

4272071, 427286, 427421, B05D 312, B05D 500, B05D 102

Patent

active

051147521

ABSTRACT:
A method for depositing liquid material onto a workpiece in the form of a deposit having a desired conformation wherein the material is discharged under pressure from the nozzle of a dispensing gun which can be manipulated by a robot to lay the deposit according to a programmed pattern on the workpiece. One or more gas jets are directed toward the material after the material is discharged from the nozzle to impart a desired conformation to the material deposited on the workpiece. The flow rate of the gas jets is controlled in accordance with the liquid flow rate to maintain substantial uniformity of the conformation of the deposit. The flow rate of the gas jets may also be controlled with reference to a tool speed signal which varies according to the relative speed between the nozzle and the workpiece as well as an auxiliary signal the latter of which can be used to selectively alter the conformation of the deposit. The invention further provides a system for avoiding disruption of a desired conformation due to irregularities in the manner liquid material is pumped to the dispensing gun by sensing occurrence of the irregularity and adjusting the flow rate of the gas jets in timed relation to the manifestation of the irregularity at the liquid discharge nozzle.

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Technical Publication No. 43-1-11, Nordson Corporation, Amherst, OH, 1981.

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