Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1992-12-17
1995-01-03
Aftergut, Jeff H.
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
156 622, 156285, 156296, 1563082, 156245, 19148, 425 801, 264121, 264122, B68G 1103
Patent
active
053782968
DESCRIPTION:
BRIEF SUMMARY
The invention relates to an apparatus for formed parts used as pads in seats, for instance.
In such formed parts, which are used e.g. in seats and backs produced by the furniture and car industry, the pad is usually formed of fibres which harden under the combined action of heat and compression into a shape determined by the press. The production has previously been carried out by placing a so-called cut block usually regular in shape and made of a padding material of uniform density in a press mould which presses the block into the desired shape with simultaneous heating.
A drawback is that the density of the padding is no longer even in the finished formed part; the density is considerably greater in the thinner portions of the formed part as compared with the thicker portions.
The object is to provide a new apparatus with a different operating principle, which apparatus enables the production of formed parts in which the density of the padding material is uniform.
The apparatus according to the invention is mainly characterized in that it comprises devices known per se for opening padding raw material into a desired looseness and for transporting it into a weighing device and for transferring the weighed batch of padding material into a filling chamber by means of a suction created by a vacuum pressure acting on the filling chamber; and that a porous mould through which the suction acts is positioned in the filling chamber for receiving the batch of padding material; that the padding raw material is at least partly formed of binding fibres melting under the influence of heat; and that the filling chamber is connected with means for first introducing hot air through the mould and the batch of padding material contained in it for melting the binding fibre material of the batch of padding material at least partly, and thereafter for introducing cold air through the mould and the batch of padding material contained therein for solidifying the batch.
To ensure that the mould is filled evenly so that the density of the padding material will be uniform, it is preferable to position the porous mould in the filling chamber in such a way that the vacuum pressure is equal on all sides of the mould. The padding is preferably of fibre material comprising a matrix fibre and a binding fibre melting at a lower temperature than the matrix fibre.
Since hot air is sucked through the porous fibre material and the mould, the entire fibre material reaches a uniform temperature rapidly. The binding fibres melt, forming bonds between the fibres through the entire fibre material layer. Correspondingly, cooling air is also sucked through the entire fibre structure, so that the cooling is rapid. Molten binding fibres get a fixed shape and the bonds become permanent.
In addition to the even density of the padding material of the finished formed parts, one important advantage of the invention is that the feeding of the fibre is carried out in the same apparatus as the thermal binding and moulding. The vacuum filling of the fibre enables the filling to be carried out with uniform density, and the density is adjustable by varying the vacuum pressure. If required, a fairly high filling density can be achieved.
In the following, the invention will be described in greater detail with reference to the embodiment shown schematically in the attached drawing.
FIG. 1 is a general side view of the structure of the apparatus.
FIG. 2 is a more detailed view of the filling and moulding part of the apparatus.
In FIG. 1, the reference numeral 1 indicates fibre material bales which are opened to a desired looseness in a manner known per se in devices 2 and 3. Through a blower 4 the padding material proceeds as a free mass flow into a cyclone 5, under which a volumetric feed box 6 is positioned, into a weighing device 7 which is controlled by a microprocessor. 8 indicates a filling device, 9 a suction blower and 10 a dust receiving bag or the like.
From the cyclone 5, pure padding material passes into the weighing device 7 controlled by the micropro
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patent: 2543101 (1951-02-01), Francis, Jr.
patent: 3032774 (1962-05-01), Wade
patent: 4520066 (1985-05-01), Athey
patent: 5064484 (1991-11-01), Craig et al.
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