Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – With bending – folding – winding – or wrapping means
Patent
1987-09-17
1990-03-13
Woo, Jay H.
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
With bending, folding, winding, or wrapping means
156140, 156141, 156156, 156500, 425 35, 425 43, 425 47, F16G 500
Patent
active
049080903
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to the manufacture of circular polymer products and has specific reference to apparatus for the pressure-forming and curing of polymer products.
PRIOR ART
There is known an apparatus for the pressure-forming and curing of polymer products incorporating two contoured moulds in the form of cylinders which are rigidly linked to each other by a screw pair and can revolve about a common axis. A means of forming and curing consists of platens (cf. FRG Patent No. 2,248,865).
The known apparatus copes with the forming and curing stepwise, in a number of cycles, and therefore erroneous pitching of cogs is likely to occur, impairing product quality. The process is time-consuming and, as a result, its productivity is low.
SUMMARY OF THE INVENTION
The principal object of the invention is to provide an apparatus for the pressure-forming and curing of polymer products wherein the features of construction of interlinked moulds and those of a forming means would improve product quality and speed up the process.
This object is realized by disclosing an apparatus for the pressure-forming and curing of polymer products comprising two moulds and a forming means, the moulds being sturdily linked to each other with provision for setting the separating distance as required and for revolving about a common axis so that the material of a circular product can be wound therearound, wherein according to the invention the moulds are semicylinders which face each other with their flat sides and are sturdily interlinked by two parallel plates so as to form integrally therewith a sturdy building core having a contoured outside surface, whereby the forming means is a girdling structure which embraces the semicylinders and plates circumferentially and is made up of at least two elements at least one whereof is located with provision for radial displacement in the course of pressure-forming.
It is expedient to have the girdling structure made up of two elements located one inside the other, the inside element contiguous with the product being an airtight hose connected to a source of pressure which causes it to displace radially, whereby the ends of the air-tight hose overlap each other and the end contiguous with the product has a flat tip.
The girdling structure of such construction provides for applying a pressure to the product which is uniform at every point thereof. It also prevents overflows of the polymer material at the joint, improving thus product quality. The removable air-tight hose renders the apparatus suitable for forming belts of various lengths under the conditions of uniform pressure applied to the blank.
It is also expedient to have the girdling structure made up of four parts located pairwise opposite to each other and movably linked to actuating means used during the pressure-forming.
Such a girdling structure is simple and reliable in operation.
The apparatus provided in accordance with the invention improves product quality, for a uniform pressure is applied to the entire product, and speeds up the process of forming.
BRIEF DESCRIPTION OF THE DRAWINGS
A preferred embodiment of the invention will now be described by way of example with reference to the accompanying drawings in which:
FIG. 1 is a sectional elevation of the apparatus for the pressure-forming and curing of polymer products according to the invention;
FIG. 2 is a plan view of FIG. 1;
FIG. 3 is a section on line III--III of FIG. 1;
FIG. 4 is a sectional elevation of the apparatus according to the invention featuring a forming means made up of two parts;
FIG. 5 is a sectional elevation of the apparatus according to the invention featuring a forming means made up of four parts.
DESCRIPTION OF THE PREFERRED EMBODIMENT
The apparatus for the pressure-forming and curing of polymer products incorporates two moulds 1 (FIGS. 1, 2) which are semicylinders, also shown at 1, facing each other with their flat sides; they are sturdily interlinked with provision for setting the separating distance as required wit
REFERENCES:
patent: 4379011 (1983-04-01), Henderson
patent: 4710251 (1987-12-01), Borchardt
Boikov Vladimir P.
Gorodnichev Jury N.
Guskov Valery V.
Kachur Isaak Y.
Kholmovsky Alexandr S.
Heitbrink Timothy W.
Woo Jay H.
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