Browse Prior Art Database

Bonding Process

IP.com Disclosure Number: IPCOM000076981D
Original Publication Date: 1972-May-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Grossman, WR: AUTHOR [+2]

Abstract

A charged dry powder adhesive is applied to a web that is of opposite charge and is held in place by the opposing static charges; later another web is moved to overlie the first web; then adhesive is inductively heated to bond the webs to one another.

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Bonding Process

A charged dry powder adhesive is applied to a web that is of opposite charge and is held in place by the opposing static charges; later another web is moved to overlie the first web; then adhesive is inductively heated to bond the webs to one another.

As web 1 moves linearly at constant speed, shutter 2 is periodically actuated by a cam 3 (or other suitable control device) to discharge in a desired pattern on to the web a measured volume of dry powder adhesive 4 from a hopper 5. The adhesive comprises particles susceptible to inductive heating.

Another web 6 is fed from a suitable source, not shown, and around roll 7 so as to overlie web 1 and the adhesive deposited thereon. The superposed webs then pass through a high-frequency field which may be applied continuously, but preferably is applied intermittently only while the deposited adhesive passes through the field. In either event, while the field is being applied, the webs are simultaneously subjected to physical pressure, as by passing between closely spaced rotating pressure rolls 8,9 that serve as conductors having a magnetizing loop. These rolls inductively heat the adhesive and thereby firmly bond the webs together wherever adhesive had been applied. The adhesive 4 and web 1 are oppositely charged to assure that there will be no dispersion of the deposited adhesive as it is carried by the web through the high-frequency inductive field. The particles susceptible to inductive heating and em...