Filter element fixation for filter presses
A method of making a filter by bonding two pieces of cloth to the flanges of a barrel-neck connector by locating a ring of bonding agent mixed with a metal powder between each flange and the adjacent surface of each cloth and using induction heating to heat the metal and thus cause the bonding agent to bond the cloth to the flanges. The bonding agent may comprise guide legs which allow its accurate location between the respective cloth and flange and/or the ring may be flexible allowing the ring to be flexed into position over the respective flange of the barrel-neck.
1. A filter element fixation apparatus comprising:
a flexible piece of thermoplastic elastomeric bonding agent mixed with a metal powder; and
a flanged tube including two flanges, wherein a piece of cloth is bonded to each of the flanges, wherein said flexible piece is located between each flange and the adjacent surface of each piece of cloth, and wherein the metal powder is heated by induction heating, thereby causing the bonding agent to bond the cloth to the flanges.
2. An apparatus as claimed in claim 1 , wherein the flexible piece has guide means to ensure its accurate location between the respective cloth and flange.
3. An apparatus as claimed in claim 1 , wherein the flexible piece is annular.
4. An apparatus as claimed in claim 1 , wherein the flexible piece has integral guide means to ensure its accurate location between the respective cloth and flange.
5. An apparatus as claimed in claim 1 wherein the flexible piece is annular and has guide means comprising a plurality of radially extending guide legs which extend from the inner periphery of said annular flexible piece.
6. An apparatus as claimed in claim 1 , wherein the flexible piece is annular and has guide means comprising a plurality of radially extending guide legs which extend from the inner periphery of said annular flexible piece, and wherein said radially extending guide legs are provided in oppositely disposed pairs.
7. An apparatus as claimed in claim 1 , wherein the flexible piece has guide means which comprises thermoplastic bonding agent mixed with a metal powder.
8. An apparatus as claimed in claim 1 , wherein the flexible piece comprises flexible guide means.
9. An apparatus as claimed in claim 1 wherein the metal powder in the bonding agent is a fine iron of 5 to 30 m diameter.
10. An apparatus as claimed in claim 1 wherein the metallic powder is distributed in the bonding agent at a ratio of about 1:1 by weight ratio of metal to bonding agent.
11. An apparatus as claimed in claim 1 , wherein the size distribution of the metallic powder in the bonding agent is not greater than 100 mesh (minus 10 to 12%).
12. An apparatus as claimed in claim 1 , further comprising a flanged tube, the flanges of the tube being flexible.