DE2247931A1 - TECHNICAL BAND - Google Patents

Description

The invention relates to a technical stiffening tape and reinforcement of certain materials, especially synthetic resins, multilayer wood and / or metal and embedding materials such as synthetic resin molds.

Carbon threads are a valuable reinforcement material for the Production of, for example, reinforced synthetic resin molds. Such forms, the carbon thread embedded in a synthetic resin structure contain desirable stiffness in relation to their weight. The carbon filaments are preferred lived in the form of a tow made up of about ten thousand individual people Threads can exist. One difficulty in making such reinforced shapes is handling the tow.

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308818/0692

& AD ORIGINAL ^

The invention is based on the object of creating improvements in this regard.

This object is achieved according to the invention by a technical tape made of a base material on which at least There is a carbon fiber tow, which is held on the material by an overlying holding thread «The tape preferably has a knitted design, part of which is formed by the overlying retaining thread is.

In a modified embodiment, a woven or non-woven base material can be provided on which the carbon fiber tow is held by overlying loops.

The base material preferably consists of fiberglass threads, whose physical properties make them particularly suitable as reinforcement in embedding materials. The overlying holding thread is advantageously also a glass fiber thread.

A number of the carbon fiber tow can be made lengthways along the ribbon, each tow being held by an overlying tether. Each Carbon fiber tow can consist of a single carbon fiber bundle or a plurality of such bundles.

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BATH

For "certain areas of application, e.g. for reinforcement of fairly large parts such as wagon superstructures and boat hulls, each carbon fiber spinnaker towers over the rest of the surface of the As far as possible. A flattening of the cable through the overlying retaining thread can be prevented by the tension of the holding thread is reduced, or - in the case of a knitted structure - by increasing the tension of the threads of the basic knitted fabric. In other forms of application such as reinforcement of a multi-layer structure where the Ribbon is embedded between two layers connected to one another by means of a synthetic resin, which closes the carbon fiber tow preferably approximately flush with the rest of the belt surface or at least as succinctly as possible.

Dop carbon fiber tow extends either axially or al ir diagonally in a zigzag shape across the ribbon. The latter Ai-sführungform provides both a reinforcement against torsional stress as well as against longitudinal bending stress. Tapes with at least two carbon fiber spim cables, one of which is axially and the other diagonally in a zigzag shape across the tape extend, provide reinforcement against both longitudinal and torsional bending and are particularly suitable for reinforcement cast skis.

Ribbons according to the invention can be made on a warp knitting machine been knitted, "which is preferably at least three warp thread insertion aversion having. A suitable device would, for example, be a single-bed rachel knitting machine. The tapes can be a

309810/0692

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Have a strength of two or more needles, preferably six needles.

Sin tape according to the invention with a single carbon fiber tow is preferably made as follows: Each warp thread needle acts as a chain link. Kin first single warp rake alternately shifts one or more needle spacings to form the basic structure over two or more needle distances to lay the threads lying behind. A second warp thread insertion rake introduces the carbon fiber tow down into the basic structure between adjacent needles. Venn the second Warp thread inlay rake that inserts carbon fiber tow without offsetting, the cable lies axially along the tape. if However, if the second warp thread rake is offset to both sides, the cable on the tape is diagonally in a zigzag shape arranged. A third warp thread insertion rake alternately displaces two or more needle distances »around the holding thread on each side of the carbon fiber tow between the To lay needles. Should the carbon fiber tow over the remaining one If the area of the ribbon protrudes, the tension of the thread lying behind the carbon fiber tow may increase, or but the tension of the holding thread over the carbon fiber spinning * cables are reduced. For example, the retaining thread can be inserted in a slight tension so that it forms an upstanding mesh around the carbon fiber tow and does not flatten it. To make a tape with a similar procedure is applied to more than one carbon fiber tow using any number of holding thread. If desired, the knitted fabric can be ladder-proof Include thread formation.

309818/0692

BATH ORIGINAL

An exemplary embodiment is shown in the drawing of the invention shown. Show it;

Fig. 1 is a mesh diagram of a belt and

Fig. 2Λ to 20 the movements of the three warp thread insertion rakes of an egg bed-rachel knitting machine for producing a tape according to FIG. 1. In the figures, only the two needles are shown, one on each side of the carbon fiber tow.

Six needles are used to knit the ribbon. On each A chain of stitches is knitted from a fiberglass thread 1 on a needle. Five fiberglass base threads 2 are placed around adjacent needles in successive Rows laid (Fig. 2A). The five basic threads are laid by a single warp thread rake, the carries five chain insertion tubes at individual needle intervals. A Carbon fiber tow 3 is held by a second Ksttfäden-Einleg rake introduced without moving the rake sideways (Fig. 2B). The chain insert tube feeding the carbon fiber tow preferably an outwardly flared inlet around the introduction to make the cable easier and prevent it from tearing. A third warp thread insertion rake is simultaneously a Fiberglass tether 4 around the needles on each side of the cable placed, with this third warp thread insertion rake offset over two needle distances in alternating directions in every aweit row becomes (Fig. 2G). The tension of the holding thread 4 is on

9818/0692

BAD ORfGINAL. ..

reduced to a minimum, bo that the thread does not flatten the cable, it forms an upright mesh around the cable.

The tape produced in this way is relatively easy to handle, especially when used to reinforce relatively large shapes such as car bodies and boat hulls.

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Claims (11)

Claims 1 J Technical tape, characterized by a base material on which at least one carbon fiber tow (3) lies, which is held on the material by means of holding threads (4) lying over it. 2. Tape according to claim 1, characterized by a knitted form, voa dar <aia f @ il durek den the retaining thread (4) lying therein is formed J. Band according to claim 2 "" dadurela g® k eias β i e hn e t that it is warp knitted «, 4. Tape according to claim 1, geke'nnsaietiaet through a woven or non-woven Grmadaat © rial on which-that Carbon fiber spinning dumplings (3) are allowed to be kept is. 5. Tape according to one of the preceding claims © "characterized in that the Gnmamateriai consists of glass fiber threads (1)". 6. Band according to claim 5 »characterized in that that the overlying Haita thread O) is a fiberglass thread is. 309818/0692 224793T 7. Band according to one of the preceding claims, thereby characterized in that the or each carbon fiber tow ($) protrudes beyond the surface of the rest of the band. 8. Tape according to one of claims 1 to 6, characterized in that that the or each carbon fiber tow (3) πι Lt ler remaining Bacdflache closes approximately flush. 9th volume according to eLnev. of the preceding claims, characterized characterized in that the carbon fiber tow (3) o :: iel extends over the tape. 10. Band according to one of claims 1 to 8, characterized in that that the carbon fiber tow (3) extends diagonally, in a ziok-zag shape over the tape 11. Tape according to oinen of claims 1 to 8, characterized in that that at least two carbon fiber tows (3) are kept on the material, τοη which the one axially and the other diagonally in a zigzag shape across that Stretch band. . Werner (Iranm
attorney