JPH0350125Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a roving formed by converging a plurality of strands into one.

[Conventional technology]

When manufacturing this type of roving, the conventional method was to set a predetermined number of cakes in the order in which they were taken out, regardless of the winding direction of the strand cakes, and then collect the strands that were unwound from each cake into one. There is.

However, when considering the state in which the strands are unwound from the cake, even if the strands wound around the cake are untwisted, twisting occurs in the strands as they are untwisted from the cake toward the winding shaft. For example, when looking at the end surface of the cake from the unwinding side of the strand, if the winding direction is right-handed, the strand will have a left-handed twist (Z-twist), and if the winding direction is left-handed, the strand will have a right-handed twist (S twist). .

Therefore, in the roving manufactured by the conventional method described above, there may be a large difference between the number of right-handed and left-handed strands, and when such a large difference occurs, the roving is also twisted. At the same time, the focusing diameter also becomes smaller, and as a result,
As shown in Figures 4 and 5, FRP products using this roving had the disadvantages of twisting and warping, as well as uneven fiber distribution within the rod.

In addition, as a means to solve these drawbacks,
It is conceivable to give the strands untwisted from the cake a twist in the opposite direction to the twist that occurs as the strands untwist, and to construct roving from the non-twisted strands.
This method requires processing steps and equipment for imparting reverse twist to each of the plurality of strands constituting the roving, resulting in high equipment and manufacturing costs.

[Problem that the invention attempts to solve]

The purpose of the present invention is to eliminate or reduce the twisting of the entire roving by actively utilizing the twisting that occurs when the roving is rolled out from the cake.

[Means for solving problems]

The characteristic structure of the roving according to the present invention is that left-twisted strands and right-twisted strands are converged into one with the same or almost equal number, and the effects and effects thereof is as follows.

[Effect]

Left-handed twist of the strands that make up the roving (Z
Since the number of twists (twists) and the number of right-handed twists are the same or almost equal, the bundled strands cancel out the twists in opposite directions, eliminating or eliminating twists in the entire roving. It can be reduced as much as possible.

[Effect of idea]

Therefore, it is only necessary to actively utilize the twisting of the strands that occurs as they are rolled out from the cake, and converge the strands so that the number of right-hand turns and the number of left-hand turns are the same or almost equal. , there is no need to modify the roving equipment in any way,
It has now become possible to advantageously manufacture untwisted rovings or rovings with very little twist in terms of equipment and costs.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings.

Figures 1 and 2 show the case where the glass fiber roving of the present invention is used in FRP product A. This glass fiber roving is constructed by converging left-handed (Z-twist) strands 3a and right-handed (S-twist) strands 3b into one with the same or almost equal numbers. has been done.

Next, to explain the manufacturing method of such glass fiber roving, as shown in Fig. 3,
The same number of right-handed cakes 2a and left-handed cakes 2b are set at multiple locations spaced apart from each other by predetermined intervals in the vertical and horizontal directions within the creel 1, and the strands 3a, 3b of each of these cakes 2a, 2b are wound. The strands 3a and 3b are fed out in an internal manner through a guide member 4 provided at one end in the direction of the take-up axis, and the strands 3a and 3b are fed into a collection 6a of the winder 6 through a tension bar 5 while converging them into one.
Wind it up.

With such a roving manufacturing method, the number of strands 3a drawn from the cake 2a in the right-handed state is the same as the number of strands 3b drawn out from the cake 2b in the left-hand state, so that the number of strands 3a drawn out from the cake 2a in the right-handed state is the same as the number of strands 3b drawn out from the cake 2b in the left-hand state. Accordingly, even if twist occurs in the strands 3a and 3b, the number of strands 3a with left twist (Z twist) and strand 3b with right twist (S twist) will be the same, and the number of strands 3a with left twist (Z twist) will be the same, and the number of strands 3b with right twist (S twist) will be the same. , 3b cancel out the twists in opposite directions, making it possible to eliminate twists in the entire roving or to reduce twists as much as possible.

In the above-mentioned embodiment, the case where the number of convergence of the strands 3a and 3b constituting the roving is an even number is explained, but in the case of an odd number, the number of left-twisted strands and the number of right-twisted strands are different. Right-handed and left-handed cakes 2a and 2b are made so that the difference is minimal or close to it (at least 1/3 or more on both the left and right sides is effective).
It is recommended to set

In addition, in the above embodiment, an internal take-up type was described in which the strands 3a and 3b are paid out from the inside of the cakes 2a and 2b toward the winding axis, but the invention is not limited to this. A take-out type may be adopted in which the strands 3a, 3b are let out on the winding axis side.

[Brief explanation of drawings]

Figures 1 to 3 show examples of the roving according to the present invention, Figure 1 is a cross-sectional view of the FRP product, Figure 2 is a perspective view, and Figure 3 is a perspective view showing the method for manufacturing the roving. . Figures 4 and 5 are a cross-sectional view and a perspective view of an FRP product using conventional roving. 3a, 3b... strands.

Claims (1)

[Scope of utility model registration request] A roving made by converging left-handed strands 3a and right-handed strands 3b in the same or almost equal number.