Heating elements for thermoplastic lamination
AssigneeThe Dow Chemical Company
InventorRobert A. Hay, II
Life of this patent
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Abstract
Laminated heating elements are provided which are suitable for joining synthetic resinous thermoplastic bodies particularly thermoplastic foams. The heating elements are of laminar structure having at least two oppositely disposed heating elements which electrically may be fed in parallel. A significant improvement in rigidity and resistance to mechanical abuse is achieved.
Claims16
An apparatus for the thermal bonding of synthetic resinous bodies wherein the apparatus provides a heated platen to be disposed between adjacent bodies to be joined, means for moving said platen relative to the bodies to be joined, means to heat the platen to a temperature sufficient to heat plastify adjacent surfaces of the bodies to be joined, and means to contact said heated surfaces which on cooling provide a bond between adjacent foam bodies, the improvement which comprises an improved heating platen, the heating platen being of laminar construction and generally planar configuration, the heating platen comprising a first electrically conductive lamina and a second electrically conductive lamina, the first and second lamina being affixed to each other in generally face to face relationship;
- the first and second lamina having a first electrical terminal and a second common electrical terminal, the first and second lamina each defining a plurality of slots wherein the first and second lamina are joined at a plurality of locations to provide mutual mechanical reinforcing to minimize bending of the platen under service conditions with the further limitation that the platen comprises two generally like heating elements joined together along a centrally located line and electrically insulated from each other except at the centrally located line and electrical feed terminals.
An improved heating platen, the heating platen being of laminar construction and generally planar configuration, the heating platen comprising a first electrically conductive lamina and a second electrically conductive lamina, the first and second lamina being affixed to each other in generally face-to-face relationship;
- the first and second lamina having a first electrical terminal and a second common electrical terminal;
- the first and second lamina each defining a plurality of slots wherein the first and second lamina are joined at a plurality of locations to provide mutual mechanical reinforcing to minimize bending of the platen under service conditions wherein the platen comprises two generally like heating elements joined together along a centrally located line and electrically insulated from each other except at the centrally located line and electrical feed terminals.
An apparatus for the thermal bonding of synthetic resinous bodies wherein the apparatus provides a heated platen to be disposed between adjacent bodies to be joined, means for moving said platen relative to the bodies to be joined, means to heat the platen to a temperature sufficient to heat plastify adjacent surfaces of the bodies to be joined, and means to contact said heated surfaces which on cooling provide a bond between adjacent foam bodies, the improvement which comprises an improved heating platen, the heating platen being of laminar construction and generally planar configuration, the heating platen comprising a first electrically conductive lamina and a second electrically conductive lamina, the first and second lamina being affixed to each other in generally face to face relationship;
- the first and second lamina having a first electrical terminal and a second common electrical terminal, the first and second lamina each defining a plurality of slots wherein the first and second lamina are joined to provide mutual mechanical reinforcing to minimize bending of the platen under service conditions, the platen comprises a first layer of generally parallel bar-like elements spaced from each other and a second layer of generally parallel bar-like elements in face-to-face relationship and in register with the first bar-like elements, a plurality of adjacent pairs of bar-like elements of the first and second layers being joined by a generally diagonally disposed bar-like element extending between remote ends of adjacent bar-like pairs and being electrically connected thereto only adjacent terminal ends of the bar-like pairs.
An improved heating platen, the heating platen being of laminar construction and generally planar configuration, the heating platen comprising a first electrically conductive lamina and a second electrically conductive lamina, the first and second lamina being affixed to each other in generally face-to-face relationship;
- the first and second lamina having a first electrical terminal and a second common electrical terminal;
- the first and second lamina each defining a plurality of slots wherein the first and second lamina are joined to provide mutual mechanical reinforcing to minimize bending of the platen under service conditions;
- wherein the platen comprises a first layer of generally parallel bar-like elements spaced from each other and a second layer of generally parallel bar-like elements in face-to-face relationship and in register with the first bar-like elements, a plurality of adjacent pairs of bar-like elements of the first and second layers being joined by a generally diagonally disposed bar-like element extending between remote ends of adjacent bar-like pairs and being electrically connected thereto only adjacent terminal ends of the bar-like pairs.
Dependencies are inferred from the claim text.