ELECTROMAGNETIC ADHESIVE AND METHOD OF JOINING MATERIAL THEREBY
First Claim
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2. The method as defined in claim 1 wherein the weight ratio of ferromagnetic particles passing through a 20 mesh screen and not passing through a 200 mesh screen to thermoplastic material is from about 1:
- 1 to about 2;
1.
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Abstract
Electromagnetic adhesive comprised of a mixture of a thermoplastic material and ferromagnetic particles having mesh sizes of from 20-200 mesh. The adhesives are employed to bond thermoplastics by the use of inductive heating, the bonding being effected in period of less than two minutes.
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Citations
13 Claims
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2. The method as defined in claim 1 wherein the weight ratio of ferromagnetic particles passing through a 20 mesh screen and not passing through a 200 mesh screen to thermoplastic material is from about 1:
- 1 to about 2;
1.
- 1 to about 2;
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3. The method as defined in claim 2 wherein the ferromagnetic particles is a member selected from the group consisting of iron, cobalt, nickel, alloys containing nickel, alloys containing cobalt and alloys containing iron.
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4. The method as defined in claim 3 wherein the thermoplastic material is selected from the group consisting of polyolefins, polystyrenes, polyamides and acetals.
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5. The method as defined in claim 3 wherein the electromagnetic field has a field intensity of from about 1 to about 30 kilowatts and a frequency from about 5 to about 30 megacycles.
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6. The method as defined in claim 3 wherein the ferromagnetic particles are of a size which pass through a 40 mesh screen and do not pass through a 100 mesh screen.
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7. An electromagnetically activatable adhesive composition, comprising a substantially uniform mixture of thermoplastic material and ferromagnetic particles, said ferromagnetic particles having particle sizes which pass through a 20 mesh screen and do not pass through a 200 mesh screen, whereby upon application of an induced electromagnetic field said particles are rapidly heatable by hysteresis and eddy current effects to a temperature above the Curie temperature of said particles.
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8. The adhesive as defined in claim 7 wherein the weight ratio of ferromagnetic particles passing through a 20 mesh screen and not passing through a 200 mesh screen to thermoplastic material is from about 1:
- 1 to about 2;
1.
- 1 to about 2;
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9. The adhesive composition as defined in claim 8 wherein the ferromagnetic particles is a member selected from the group consisting of iron, cobalt, nickel, alloys containing nickel, alloys containing cobalt and alloys containing iron.
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10. The adhesive as defined in claim 9 wherein the thermoplastic material is selected from the group consisting of polyolefins, polystyrenes, polyamides and acetals.
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11. The adhesive composition as defined in claim 9 wherein the composition is in the form of a solid sheet.
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12. The adhesive composition as defined in claim 9 wherein the composition is in the form of a ribbon.
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13. The adhesive as defined in claim 9 wherein the ferromagnetic particles are of a size which pass through a 40 mesh screen and do not pass through a 100 mesh screen.
Specification