Adhesive bonding and miscellaneous chemical manufacture – Methods – Surface bonding and/or assembly therefor
Patent
1986-01-16
1986-12-02
Ball, Michael
Adhesive bonding and miscellaneous chemical manufacture
Methods
Surface bonding and/or assembly therefor
118 57, 118420, 156 736, 156441, 427174, 427175, 427182, 427346, B05D 124
Patent
active
046263063
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a process for manufacturing profiled strips having high mechanical performance properties, consisting of continuous unidirectional fibers embedded in a thermoplastic resin.
The invention further covers an installation for implementing this procedure and the profiled strips thereby obtained.
By way of an example, as in French Pat. No. 2,031,719, a procedure is known for obtaining profiled strips composed of agglomerated fibers using powder-based synthetic resins and intended primarily for producing long-fiber granules.
This process consists of separating out all the fibers initially in strand or slubbing form, of coating these individual fibers with a synthetic resin in powder form and, immediately after coating, of inducing resin fusion followed by the forming and cooling of the product.
The fibers are separated from each other by introducing the fiber slubbing into a venturi through which a fluid flows at high speed. The fibers thus taken apart then pass under a powder-based synthetic resin feeder and the thus impregnated fibers then run through a heated die from which a sectional form is delivered comprised of agglomerated fibers in a synthetic resin.
The drawbacks of this procedure are manifold. Indeed, there is no way of governing the resin distribution inside the fibers.
Granted that the resin spread between the fibers cannot be uniform and that the aforementioned procedure provides no way of obtaining high fiber content, these profiled strips offer rather low tensile strength, well under 100 hbars when using type E glass fibers.
The object of the present invention is to overcome the drawbacks of the aforesaid process.
In the process covered by the invention, a lap of parallel fibers is impregnated with resin particles, the resin is then melted, the profiled strip formed and the latter finally cooled.
In accordance with the invention, this process is characterized in that a lap of parallel and equally-taut fibers is composed starting from several untwisted fiber slubbings. The lap of fibers is dipped in a bath of resin particles, mechanically impregnated with the particles and any excess of particles is then removed to achieve the desired resin content.
Preferably, the lap of fibers can be mechanically impregnated with the resin particles by feeding the lap over rollers immersed in the resin particles and by adjusting the contact pressure of the lap on the rollers such that the resin particles are mechanically forced through the fibers by the rollers. It has been noted that the resin particle impregnation of the lap could thus be perfectly controlled thereby obtaining a very uniform distribution therein.
By way of a variant, this mechanical impregnation can be achieved by other means, such as centrifuging, ultra-sonic methods, etc.
As a result of this procedure, profiled strip can be produced having a fiber content of at least 50% and preferably 70% by weight and a wide cross-section, where the tensile strength exceeds 100 hbars when use is made of type E glass fibers.
These high fiber content and high performance continuous profiled strips are particularly well suited to the wound reinforcement of hollow bodies (tubes or tanks as described in French patent application No. 80 20666 dated Sept. 26 1980, on behalf of Spie-Batignolles).
In a preferred embodiment of the invention, a lap of parallel and equally-taut fibers is made up from several slubbings of untwisted fibers whereupon the surface of the fibers is treated for adherence of the resin employed.
Consequently, excellent adherence of the resin on the fibers is obtained, even when the initial batching of the fibers is not compatible with the resin used.
In an advantageous embodiment of the invention, after resin fusion, the lap loaded with melted resin is cold formed by pinch passing it between two cooled cylinders. This operation provides a method of obtaining better results than feeding the lap through a die due to the high viscosity level of these resins when melted. Furthermore, by having cooled cylinders, it
REFERENCES:
patent: 2852840 (1958-09-01), Harvey
patent: 2881087 (1959-04-01), Schwartz et al.
patent: 3703396 (1972-11-01), LaMarche et al.
patent: 3742106 (1973-06-01), Price
patent: 3862287 (1975-01-01), Davis
patent: 3897533 (1975-07-01), Hani et al.
patent: 3940464 (1976-02-01), Davis
patent: 4158297 (1979-06-01), Winch
Chabrier Gilbert
Maurion Roger
Moine Guy
Szabo Rene
Ball Michael
Coflexip
Spie-Batignolles
LandOfFree
Process for manufacturing profiled strips in fiber-loaded thermo does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Process for manufacturing profiled strips in fiber-loaded thermo, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Process for manufacturing profiled strips in fiber-loaded thermo will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2291107