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Heated Air Knife for Removing Solder From Contacts

IP.com Disclosure Number: IPCOM000038371D
Original Publication Date: 1987-Jan-01
Included in the Prior Art Database: 2005-Jan-31
Document File: 2 page(s) / 37K

Publishing Venue

IBM

Related People

Beaman, DP: AUTHOR [+2]

Abstract

A heated air knife is shown in Figs. 1 and 2 which provides a non-contact technique which removes soldered contacts from printed circuit cards/boards. This air knife provides a flow of hot air which blows off the contacts and removes all solder. Figs. 1 and 2 show the air knife. Two important dimensions are: 1. The orifice diameter: 4 mm 2. Orifice angle: 15 degrees This angle is established by the orifice axis and the vertical axis. This orifice is on one side of the air knife so that it can be mounted as close as possible to the outlet of the heating chamber. Therefore, the solder and contacts would be blown off as soon as they exit the heat chamber.

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Heated Air Knife for Removing Solder From Contacts

A heated air knife is shown in Figs. 1 and 2 which provides a non-contact technique which removes soldered contacts from printed circuit cards/boards. This air knife provides a flow of hot air which blows off the contacts and removes all solder. Figs. 1 and 2 show the air knife. Two important dimensions are: 1. The orifice diameter: 4 mm

2. Orifice angle: 15 degrees

This angle is established by the orifice axis and the

vertical axis.

This orifice is on one side of the air knife so that it can be

mounted as close as possible to the outlet of the heating

chamber. Therefore, the solder and contacts would be blown

off as soon as they exit the heat chamber. The soldered

contacts and solder must be removed at the solder's melting

point and before it condenses. Three more important dimensions which are relative dimensions from the air knife orifice to printed circuit cards are listed below: 1. 3.77 mm is the horizontal distance from the orifice center to

the solder tap.

2. 4.42 mm is the vertical distance from the orifice center to

the contact top.

3. 4.84 mm is the shortest distance traveled by the hot air flow

after leaving the orifice and prior to hitting the contact.

As soon as the contacts and solder exit the heat chamber, the solder is melting and traveling under the air knife. The air knife blows off the contacts and all solder to a container. The hot air flow for the air knife is heated up by an air knife heater...