Adhesive bonding and miscellaneous chemical manufacture – Surface bonding means and/or assembly means therefor – Longitudinally progressive helical winding means
Patent
1982-12-29
1985-04-16
Ball, Michael
Adhesive bonding and miscellaneous chemical manufacture
Surface bonding means and/or assembly means therefor
Longitudinally progressive helical winding means
118405, 156174, 156428, B65H 8100
Patent
active
045114242
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
The present invention relates to a method and an apparatus for producing a sheet molding compound.
2. Background Art
The term "linear material" as used herein and in the appended claims is to be understood to mean any such materials as vegetable fiber, animal fiber, mineral fiber, synthetic fiber, metal wire, and the like.
Glass fiber sheet used heretofore was a textile fabric in which warps and wefts were crossed and interwoven together as in a common textile fabric. In such woven glass fiber sheet, however, there was a tendency that the threads bent at intersections broke easily, resulting in a disadvantageous decrease in the strength of the sheet as a whole. In general, a sheet used as a reinforcing material of a product of a reinforced synthetic resin is preferably not a woven sheet but an unwoven sheet in which warps and wefts are laid on each other in a lattice shape. In producing a long belt-like sheet in this way, however, arrangement of wefts was difficult and inefficient. Accordingly, continuous production of such sheet was impossible, and multi-layer arrangement of warps and wefts was difficult.
Therefore, the present applicant previously proposed methods and apparatuses for continuous production of a sheet, in which glass fibers were not woven but were only laid on each other (Japanese Patent Public Disclosures Nos. 114979/78 and 125772/79). These inventions included an indispensable step of winding a glass fiber as a weft. In the heretofore employed winding processes including the step employed in these inventions, a linear material was wound around a core bar either by rotating the core bar while holding a bobbin on which the linear material was wound in a fixed position or by moving the bobbin about the core bar which was fixed. However, the conventional winding processes had serious disadvantages such that:
(1) It was difficult to enlarge the equipment because either the bobbin or the core bar had to be rotated or moved about;
(2) A continuous operation over a long time was difficult because exchange of the reel and extension of the core bar were necessary;
(3) It was difficult to wind a number of linear materials simultaneously; and
(4) Since the rotating and moving means was relatively complicated in construction and large in size, it was difficult to add thereto apparatuses to perform other working processes simultaneously.
DISCLOSURE OF THE INVENTION
Accordingly, an object of the present invention is to provide a method and an apparatus for producing a sheet molding compound without weaving linear materials, which are simple and economical and yet are capable of obviating disadvantages of the conventional winding processes.
The method according to the present invention comprises the steps of circulating a flat belt, changing the shape of the flat belt in the intermediate portion thereof into a cylindrical form, guiding a carrier film and warp linear materials longitudinally of the cylindrically formed portion, winding a weft linear material thereon, supplying synthetic resin, cutting open the cylindrically formed body comprising the warp linear materials and the weft linear material longitudinally into a belt-like sheet, and winding up the belt-like sheet. The method according to the present invention is characterized in that the flat belt is changed in shape at the intermediate portion thereof into the cylindrical form and the weft linear material is wound thereabout.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic side view showing the construction of the apparatus according to the present invention;
FIG. 2 is a perspective view of the belt circulator;
FIG. 3 is a schematic illustration of the principle of the winding method according to the present invention;
FIGS. 4A to 4C are sectional views showing the relationships between the winding disk and the winding drum;
FIG. 5 is a perspective view of the winder;
FIG. 6 is a sectional view of an embodiment of the winder according to the present invention;
FIG. 7 is an elevation viewed from the
REFERENCES:
patent: 3282757 (1966-11-01), Brussee
patent: 3616072 (1971-10-01), Bostrum
patent: 4251036 (1981-02-01), McLain
patent: 4265691 (1981-05-01), Usui
patent: 4295917 (1981-10-01), Stinnes
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