US Patent No: 5,486,684
Number of patents in Portfolio can not be more than 2000
Multipass induction heating for thermoplastic welding
Stats
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Jan 23, 1996
Issued date -
Jan 3, 1995
filing date -
08/367,546
serial no -
Expired
status
Importance
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Abstract
An induction coil is passed over an interface between two resinous parts to be welded and an alternating magnetic field generated by the coil induces eddy currents in a foraminous susceptor positioned in the interface between the two parts. Pressure is applied to squeeze the two parts together while the induction heating of the susceptor raises the temperature of the resin in the faying surfaces of the two parts to the softening temperature so that resin flows through the interstices in the susceptor and bonds the two parts together. The induction heating and pressure application passes are repeated four or more times, increasing the power to the induction coil in the later passes to increase the heat input. The strength and continuity of the weld improves with each pass, although the incremental improvement diminishes after about four passes.
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First Claim
Related Publications
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International Classification(s)
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Cited Art
| Patent Info | (Count) | # Cites | Year |
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| 4,355,222 Induction heater and apparatus for use with stud mounted hot melt fasteners | 94 | 1981 | |
| 4,673,450 Method of welding together graphite fiber reinforced thermoplastic laminates | 45 | 1985 | |
| 5,313,037 High power induction work coil for small strip susceptors | 57 | 1991 | |
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| 4,897,518 Method of monitoring induction heating cycle | 64 | 1988 | |
| 5,250,776 Apparatus and method of measuring temperature | 45 | 1991 | |
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| 5,079,817 Apparatus for controlling the heating and cooling of a roll | 43 | 1989 | |
| 5,283,409 Coil body for the inductive heating of rollers | 35 | 1992 | |
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| 4,343,982 Method of joining metal to graphite by spot welding | 39 | 1981 | |
| 4,382,113 Method for joining graphite to graphite | 47 | 1981 | |
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| 4,768,433 Hot air calender roll controller | 42 | 1985 | |
| 4,653,396 Recirculating air calender roll controller | 47 | 1985 | |
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| 4,313,777 One-step dual purpose joining technique | 74 | 1979 | |
| 4,521,659 Induction heating gun | 79 | 1983 | |
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| 4,304,975 Inductively heatable godet | 45 | 1979 | |
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| 5,313,034 Thermoplastic welding | 75 | 1992 | |
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| 4,421,588 Plastics alloy compositions | 59 | 1982 | |
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| 4,904,972 Gas-insulated stationary induction electrical apparatus | 45 | 1989 | |
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| 5,101,086 Electromagnetic inductor with ferrite core for heating electrically conducting material | 87 | 1990 | |
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| 4,296,295 Induction heating coil | 46 | 1980 | |
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| 5,199,791 Temperature sensor | 46 | 1991 | |
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| 4,978,825 Thermoplastic composite induction welder | 46 | 1989 | |
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| 4,445,951 Method of manufacturing composite materials | 63 | 1982 | |
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| 5,074,019 Roll with induction heating arrangement | 61 | 1989 | |
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| 4,947,464 Heating coil assembly for an electromagnetic induction cooking assembly | 36 | 1988 | |
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| 4,822,972 Bearing cooling apparatus of heating roller | 40 | 1987 | |
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| 5,001,319 Arrangement for continuous induction welding | 45 | 1990 | |
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| 4,288,673 High frequency induction heating apparatus | 35 | 1979 | |
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| 4,919,759 Control of detachment of a paper web from a roll using heat | 39 | 1988 | |
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| 4,791,260 Induction type electrical wire preheater | 34 | 1987 | |
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| 4,416,713 Method and apparatus for joining abutting edges of sheet material | 83 | 1980 | |