JPH0765260B2 - Method and apparatus for manufacturing glass fiber mat - Google Patents

Description

The present invention relates to a method for producing a glass fiber mat by needling a laminated unidirectional fiber layer and non-directional fiber layer (random fiber layer). And its device.

[Conventional technology]

FIG. 13 shows a conventional glass fiber mat manufacturing apparatus. In this case, first, at the start end of the mat production line, the unidirectional fiber bundle 2 is supplied onto the belt conveyor 3 from the warp beam 1 in which the glass fiber bundle (cake, roving or yarn) is rewound, and the unidirectional fiber layer is supplied. Is formed, and the continuous long glass fiber bundles 4 are shaken off in a random manner, and the non-directional fiber layer 5 is laminated. The laminate of the unidirectional fiber layer and the non-directional fiber layer 5 is subsequently passed through a dryer 6 to be dried, and then sent to a needler 7 where they are entangled by needling. Thereby, the unidirectional fiber layer and the non-directional fiber layer 5 are integrated into a glass fiber mat.

This glass fiber mat is used, for example, for producing a FRTP stampable sheet (original plate). This stampable sheet is disclosed in JP-B-63-15135 and JP-B-61-11264.
It is produced by impregnating a glass fiber mat with a molten resin by a known method as disclosed in, for example, 2 gazettes and the periodical publication "Plastic Age" page 194 (issued in April 1989). The stampable sheet is further cut into a predetermined size and number of sheets, and is stamped and molded into a molded product having high strength and elasticity in one direction, such as a bumper beam of an automobile.

[Problems to be Solved by the Invention]

The final product, such as a molded article, for example, a bumper beam, must have stable performance (for example, bending fracture strength). For that purpose, it is necessary that the glass fiber bundles of the unidirectional fiber layer are correctly oriented in the direction in which the strength of the molded product is required. This is likewise necessary in the stampable sheet which is the original plate of the molded product, and also in the glass fiber mat used for producing the stampable sheet. In other words, when the unidirectional fiber layer and the non-directional fiber layer are entangled by needling to form a glass fiber mat, the glass fiber bundles forming the unidirectional fiber layer are spaced as evenly as possible in the width direction of the mat. It must be arranged in parallel (not to meander). This array uniformity influences the performance of the molded product.

However, in the conventional method, although the glass fiber bundles are uniformly arranged in the width direction of the mat at the entrance of the conveyor, the non-directional fiber layer is shaken off and superposed on the unidirectional fiber layer and dried. As it passes through the plane, the force of the hot air disturbs the array. Further, when the vehicle travels on the conveyor to reach the position just before the needler, the arrangement of the needle is further disturbed by the vibration of the needler. Since the glass fiber mat needling in such a state has a very non-uniform arrangement of the glass fiber bundles constituting the unidirectional fiber layer, it is stable from a stampable sheet made using such a mat. A molded product with the specified performance cannot be obtained.

Therefore, an object of the present invention is to eliminate the above-mentioned drawbacks, and to provide a method and an apparatus for manufacturing a glass fiber mat in which glass fiber bundles are arranged in parallel at regular intervals in the width direction of the mat. .

[Means for Solving the Problems]

In the invention of the method, a glass fiber bundle is shaken off on a horizontally arranged belt conveyor to form a non-directional fiber layer, and the non-directional fiber layer is dried in a dryer, and then unidirectionally dried. By the fiber bundle supply device, the unidirectional fiber bundle is supplied onto the dried non-directional fiber layer to laminate the unidirectional fiber layer, and at this time, the unidirectional fiber bundle is arranged at regular intervals in the width direction. By guiding in parallel and feeding the laminated unidirectional fiber layer and non-directional fiber layer to a needler to form a glass fiber mat, the glass fiber mat is formed, and the glass fiber mat is discharged by a delivery roller. To be achieved.

Further, in the invention of the apparatus for producing a glass fiber mat by needling the laminated unidirectional fiber layer and non-directional fiber layer, in the invention of the belt conveyor arranged horizontally, the glass fiber on the belt conveyor is arranged. A non-directional fiber bundle supply device that shakes the bundle to form a non-directional fiber layer, a dryer disposed in front of the non-directional fiber bundle supply device, and a glass fiber bundle is supplied on the non-directional fiber layer In order to form a unidirectional fiber layer, the unidirectional fiber bundle supply device arranged in front of the dryer, and the unidirectional fiber bundle supplied from the unidirectional fiber bundle supply device at a constant interval in the width direction. In order to guide in parallel at a position, means for applying a constant tension to the unidirectional fiber bundle supplied from the unidirectional fiber bundle supply device, and the laminated unidirectional fiber layer and non-directional fiber layer , Needlin By providing a needler arranged in front of the one-way fiber bundle supply device for entanglement by and a delivery roller arranged in front of the needler for carrying out the glass fiber mat. To be achieved.

In this case, it is desirable that the unidirectional fiber bundle supply device is a warp beam in which a glass fiber bundle is wound. Further, the unidirectional fiber bundle supply device comprises a pipe and a guide for guiding the glass fiber bundle from the roving, the yarn and the cake, and a feed roller which is driven to rotate and supplies the glass fiber bundle onto the non-directional fiber layer. Is desirable. Further, the means for applying a constant tension to the unidirectional fiber bundle is an electromagnetic clutch attached to the warp beam or the feed roller, and this electromagnetic clutch operates in synchronization with the intermittently rotating delivery roller, and its braking action It is desirable to apply tension to the unidirectional fiber bundle. Further, the means for applying a constant tension to the unidirectional fiber bundle is a rotary drive device for the warp beam or the feed roller, and this rotary drive device rotates at a peripheral speed almost the same as the average take-up speed of the intermittently rotating delivery roller. It is desirable to apply tension to the unidirectional fiber bundle. Further, it is desirable that the means for applying a constant tension to the unidirectional fiber bundle is a tension roller arranged so as to be lightly pressed against the unidirectional fiber bundle.

〔Example〕

 Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an embodiment of a glass fiber mat manufacturing apparatus according to the present invention. In FIG. 1, 10 and 11 are belt conveyors arranged substantially horizontally. In the starting end area (the area on the right side in FIG. 1) of the belt conveyor 10, continuous glass long fiber bundles 12 are randomly shaken off by a non-directional fiber bundle supply device (not shown) to form a non-directional fiber layer (random A fiber layer) 13 is formed. A plurality (4 in the illustrated embodiment) of the non-directional fiber bundle supply device are arranged at a constant interval in the conveying direction of the conveyor, and the continuous glass fiber bundle 12 is spirally dropped while reciprocating at a predetermined speed in the width direction. (See, for example, Japanese Examined Patent Publication No. 63-6660). The continuous glass fiber bundle 12 is, for example, a filament with a single yarn diameter of 23μ.
400 pieces are bundled and shaken off so that the weight of the non-directional fiber layer 13 per unit area is, for example, 440 g / m ² .

The non-directional fiber layer 13 thus formed is conveyed by the belt conveyor 10 and passes through the dryer 14. The dryer 14 blows hot air of about 50 ° C. onto the non-directional fiber layer 13 to dry it.

The non-directional fiber layer 13 is subsequently transferred to the belt conveyor 11. A unidirectional fiber bundle 15 is supplied from a warp beam 16 on the non-directional fiber layer 13 in the end region of the belt conveyor 11. The warp beam 16 has, for example, a single yarn diameter of 23 μ,
A glass fiber bundle (cake, roving or yarn) having a bundle number of 2000 and a moisture content of 4 to 5% is rewound in advance with a length of about 200 m and a length of about 540 with a pitch of 4 mm and a width of 2.2 m. War Beam 1
6 is rotatably supported by its shaft, and is equipped with an electromagnetic clutch (not shown) for braking rotation. This electromagnetic clutch operates in synchronization with a later-described delivery roller that rotates intermittently, and serves to stretch the unidirectional fiber bundle 15. However, the warp beam 16 can also be rotated by a rotary drive. In this case, the warp beam 16 rotates at about the same speed as the average take-up speed of the intermittently rotating delivery roller, and also serves to stretch the unidirectional fiber bundle.

Unidirectional glass fiber bundle 15 drawn out from the warp beam 16
Is fed onto the non-directional fiber layer 13 after passing through the comb-shaped guide 17. The comb-shaped guide 17 preferably has a variable pitch. The unidirectional fiber bundles 15 may be passed through the comb-shaped guide 17 one by one or two. The comb guide 17 itself is known in the textile industry and will not be described in detail here.

The laminated unidirectional fiber layer and non-directional fiber layer 13 are subsequently supplied to a needler 18, and needling is performed so that the needle enters from the side of the unidirectional fiber layer. As a result, both layers are entangled and integrated to form a glass fiber mat. The needler 18 itself is known and will not be described in detail here.

A delivery roller 20 for carrying out the glass fiber mat 19 is provided on the exit side of the needler 18. The delivery roller 20 is intermittently rotated.

In the case of the glass fiber mat manufacturing apparatus configured as described above, the warp beam which is a supply device for the unidirectional fiber bundle 15 is used.
Since 16 is arranged between the dryer 14 and the needler 18, the arrangement of the unidirectional fiber bundle is not disturbed by the hot air blowing of the dryer 18. Further, since the unidirectional fiber bundle 15 is guided through the comb-shaped guide 17 and the unidirectional fiber bundle 15 is tensioned, the unidirectional fiber bundles 15 are guided and supplied in parallel with each other at a constant interval, and even if the needler 18 is vibrated. It is arranged straight on the non-directional fiber layer 13 without meandering.

In the case of applying tension by the electromagnetic clutch, when the delivery roller 20 rotates, the electromagnetic clutch weakens the braking force to apply a constant tension to the unidirectional fiber bundle 15, and when the delivery roller 20 stops. The braking force of the electromagnetic clutch increases and the rotation of the warp beam 16 is stopped.

In the case of applying tension by the rotary drive device of the warp beam 16, the warp beam is rotationally driven at a speed almost the same as the average take-up speed of the intermittently rotating delivery roller, so while the delivery roller 20 is stopped, Although the unidirectional fiber bundle 15 sags, it is stretched when the delivery roller rotates again, so there is no problem in arranging the unidirectional fiber bundle 15 uniformly.

FIG. 2 shows another device for applying tension to the unidirectional fiber bundle 15. This device comprises a tension roller 22 which is biased by a spring 21 so as to be lightly pressed against the unidirectional fiber bundle 15 pulled out from the warp beam 16. In this case, the tension roller 22 may be rotatably supported by a bearing or may not be rotated. Furthermore,
Instead of using the spring 21, tension may be applied to the unidirectional fiber bundle 15 only by the weight of the tension roller.

3 to 12 show modifications of the unidirectional fiber bundle supply device. In the case of the warp beam 16 as the unidirectional fiber bundle supply device shown in FIG. 1, first, roving and cake,
This requires a process of preparing a large number of yarns, once arranging them in parallel with the same tension and rewinding them into a warp beam, which is costly and uneconomical. Further, the production of glass fiber mats is also limited to the length of glass fiber wound on the warp beam 16 (eg, 200 m). When the warp beam 16 glass fiber bundles are used up, production must be stopped and the warp beam replaced. In the replacement work, 540 glass fiber bundles must be reattached one by one, passed through a comb-shaped guide, and the length must be adjusted so that a constant tension is applied.
This series of work takes several hours and is very inefficient.

Modification 16 'of the unidirectional fiber bundle feeder shown in Figs.
In order to eliminate the above-mentioned drawbacks of the warp beam 16, the roving, cake and yarn are directly supplied to the needler 18 without being rewound on the warp beam.

The unidirectional fiber bundle supply device 16 'is essentially a shelf 24 on which a roving, cake or yarn winding 23 is placed, and a glass fiber bundle (unidirectional fiber bundle) drawn from the roving, cake or yarn winding 23. ) 15, a rigid straight pipe 25, a flexible pipe 26 connected to the pipe 25, and a feed roller 27 to which a glass fiber bundle is supplied from the flexible pipe 26.

Shelving 24 for rolling rovings, cakes or yarn rolls 23
Are arranged in a V-shape, for example, at a position apart from the mat production line. The glass fiber bundle 15 is a roll of roving, cake or yarn as shown in FIGS. 4 and 5.
It is pulled out from 23 and straddles the stainless steel guide rod 28, and the two rods are put together and passed through the hole of the guide plate 29. The guide plate 29 is fixed to the side surface of the shelf 24 with screws or the like, and a titanium guide 30 is attached to the hole. Next, a glass fiber bundle
15 is guided into a straight pipe 25 made of hard vinyl chloride having a cap 31 and a titanium guide 32 attached to its tip (see FIG. 6).

If the individual glass fiber bundles are not separated by the pipes 25, the glass fiber bundles 15 will be in a taut state when pulled out or in a drooping state, so that the glass fiber bundles are They get entangled and entangled. Then, the glass fiber bundles 15 advance while rubbing against each other, breakage of single yarn occurs, fluff occurs, and finally the glass fiber bundles 15 are cut. The vinyl chloride pipe 25 functions to separate the glass fiber bundles 15 from each other and prevent such troubles from occurring.

Furthermore, when the glass fiber bundle 15 moves up and down, the tension applied to the glass fiber bundle also changes. That is, when the glass fiber bundle droops largely, the tension also becomes large, and when the drooping is small, the tension becomes small. However, as described above, when the glass fiber bundle 15 is drawn through the straight pipe 25, the range in which the glass fiber bundle 15 moves up and down can be minimized and the fluctuation in tension can be reduced.

The material of the pipe 25 suitable for these purposes may be made of metal or plastic, but if it is made of metal, the pipe becomes heavy, and the pedestal for suspending it must also be strong, and the glass fiber It is necessary to select one that is also resistant to corrosion by the peroxide contained in the binder of the bundle. On the other hand, if it is made of plastic, a hard plastic having no tackiness may be light in weight and have a simple pedestal, and there is no need for corrosion. If the inner wall surface is smooth, pipes made of, for example, fluorine resin, olefin resin, vinyl chloride, ABS, PC, acrylic can be used. In particular, a hard vinyl chloride pipe that is widely commercially available for piping is preferable in terms of cost and performance.

The glass fiber bundle exiting the straight pipe 25 passes through the flexible pipe 26 with a corrugated inner wall surface that draws a gentle curve.
It is guided to the feed roller 27. The role of the flexible pipe 26 is to reduce the abrasion of the glass fiber bundle 15 as much as possible and to change the direction gently. Therefore, it is desirable that the inner wall surface of the flexible pipe 26 is corrugated and the contact area between the glass fiber bundle 15 and the pipe 26 is small. First
7a to 7e show an example of the flexible pipe 26. In FIG. 7a, the corrugations are independent in a ring shape and are formed at regular intervals. In the case of FIG. 7b, the corrugations are formed in the shape of a single or multiple threads. 7c
In the illustrated case, an independent ring-shaped protrusion is formed on the inner wall surface. In the case of FIG. 7d, the projecting portion is formed in the shape of a single thread or a plurality of threads. In Fig. 7e, a spring is inserted and fixed in the flexible pipe.

The material of the flexible pipe 26 is also a straight pipe.
The same as 25 is suitable. In other words, it is lightweight and
It is good that the surface is finished smoothly. For example,
Widely marketed as a wire protection tube by Mirai Kogyo Co., Ltd.
Product name of "Miraflexi SS, MFS-16 "are preferred.

The glass fiber bundle 15 is guided from the flexible pipe 26 to the entrance.
It is supplied to the feed roller 27 via 35 (referred to as an entrance guide because it is located on the entrance side with respect to the feed roller 27). As shown in FIG. 8, the inlet guide 35 is attached by an iron pipe 36 having an inner diameter equal to the outer diameter of the flexible pipe 26, an iron plate 37 to which this iron pipe is welded, and a guide retainer 38 at the opening of the iron pipe 36. It consists of a titanium guide 39 that has been removed. The iron plate 37 extends over the entire length of the feed roller 27, which will be described later, and has a rectangular shape curved in an arc shape.
As shown in the plan view of FIG. 9, a large number of iron pipes 36 are arranged and fixed on the iron plate 37 while being offset from each other in the width direction and the longitudinal direction of the iron plate 37. The flexible pipe 26 is inserted and fixed to each iron pipe 36.

The glass fiber bundle 15 is supplied from the flexible pipe 26, the titanium guide 39, and the three rubber-coated rollers 41, 42, and 43 to the feed roller 27. At this time, when the iron plate 37 is flat, the center line 40 (see FIG. 8) of the inlet guide 35 (the flexible pipe 26, the titanium guide 39 or the iron pipe 36) and the tangent line of the first roller 41 of the feed roller 27 are formed. Does not match, the glass fiber bundle 15 travels while being rubbed by the edge of the titanium guide 39. Then, the larger the contact angle at the edge of the titanium guide 39, the more fluff is generated, and the generated fluff adheres to the traveling glass fiber bundle 15 and also migrates to the surface of the feed roller 27, and the fluff is successively generated. Occurs, and finally the glass fiber bundle is cut and wound around the feed roller. In order to prevent such trouble, the center line 40 (normal line) of the inlet guide 35 is arranged so as to coincide with the tangent line of the first roller 41 of the feed roller 27 (see FIGS. 10 and 10A). . In this way, the glass fiber bundle 15
Has a small contact angle at the edge of the titanium guide 39 and almost no fluff occurs.

The glass fiber exiting the inlet guide 35 is supplied to the feed roller 27 at intervals of the titanium guide 39.
Since the pitch of 15 is as narrow as 8 mm, it may be traversed between the titanium guide 39 and the feed roller 27 as shown on the right side of FIG. When contacting the feed roller 27 while being twilled, the glass fiber bundle 15a and the glass fiber bundle 15b are overlapped and sandwiched between the rollers of the feed roller 27 (for example, the first roller 41 and the second roller 42). (See Figure 12).
Then, the glass fiber bundle 1 adjacent to the glass fiber bundles 15a and 15b
In 5c, the force sandwiched between the first roller 41 and the second roller 42 becomes small, so the take-up speed becomes slow, and the supply tension to the Benedler 18 becomes large relative to the glass fiber bundle that is normally sent. As a result, impregnation of the glass fiber bundle 15c with the resin becomes worse during the production of the stampable sheet, which hinders the development of strength and deteriorates the appearance of the molded product. Therefore,
A comb-shaped guide 44 as shown in FIG. 11 is provided in front of the first roller 41. By this guide 44, the adjacent glass fiber bundles 15 are taken up by the feed roller 27 without being twilled.

The glass fiber bundle 15 is fed from the feed roller 27 to the needler 18
Through the comb-shaped guide 17 with variable pitch installed at the entrance of
The needler 17 is supplied with a uniform arrangement and tension. As a result, the glass fiber bundle (unidirectional fiber bundle) 15 becomes
In the figure, they are stacked on the non-directional fiber layer 13 conveyed from the right side to the left side below the feed roller 27 and needling.

In this way, the roving, cake or yarn is directly fed as a unidirectional fiber bundle to the glass fiber mat manufacturing apparatus (for example, the needler), so that the step of rewinding the roving, cake or yarn into the warp beam is unnecessary. . Also, roving, cake or yarn roll replacement is performed by connecting the roving, cake or yarn start end of a new roll in sequence from the one where the glass fiber is near the end. It's very easy because you don't need to adjust the length or tension like. Furthermore, since the replacement of the rolls is performed without stopping the glass fiber mat manufacturing equipment, the glass fiber mat can be continuously produced.

〔The invention's effect〕

In the case of the method and apparatus for producing a glass fiber mat according to the present invention, since the unidirectional fiber bundle supply device is arranged between the dryer and the needler, the arrangement of the unidirectional fiber bundle is disturbed by the hot air blowing of the dryer. Absent. Further, since the unidirectional fiber bundles are guided through the comb-shaped guide and the tension is applied to the unidirectional fiber bundles, the unidirectional fiber bundles are guided and fed in parallel with each other at regular intervals, and are subjected to the vibration of the Needler. Is also arranged straight on the non-directional fiber layer without meandering.

Therefore, a glass fiber mat having stable performance can be manufactured by the method and apparatus for manufacturing a glass fiber mat according to the present invention.

[Brief description of drawings]

FIG. 1 is a perspective view showing an apparatus for producing a glass fiber mat according to an embodiment of the present invention, FIG. 2 is a view showing an example of an apparatus for applying tension to a unidirectional fiber bundle, and FIGS. 3 to 12 are unidirectional fiber bundles. It is a figure which shows the modification of a supply apparatus, FIG. 3 is a top view of the glass fiber mat manufacturing equipment provided with the unidirectional fiber bundle supply apparatus by this modification, FIG. 4 is roving winding of a unidirectional fiber bundle supply apparatus. FIG. 5 is a perspective view showing the positional relationship between the body, the shelf, and the hard pipe, FIG. 5 is a side view of FIG. 4, and FIG. 6 is a cross-sectional view showing an inlet portion of the hard pipe, FIGS. 7a, 7b, and 7c. 7d and 7e are sectional views showing different examples of the flexible pipe,
FIG. 8 is a sectional view of an inlet guide provided in front of the feed roller, FIG. 9 is a plan view of an iron plate and an iron pipe of the inlet guide, and FIG. 10 is a schematic side view showing a positional relationship between the inlet guide and the feed roller. , Fig. 10A is a partially enlarged view of Fig. 10, Fig. 11
FIG. 12 is a perspective view showing a feed roller, FIG. 12 is a view showing a glass fiber bundle which is twilled and overlapped between the feed rollers,
FIG. 13 is a perspective view showing a conventional apparatus for manufacturing a glass fiber mat. 10,11 …… Conveyor belt, 12 …… Glass filament bundle, 13
...... Non-directional fiber layer, 14 …… Dryer, 15 …… Unidirectional fiber bundle, 16 …… Warp beam, 17 …… Comb guide, 18 …… Needler, 19 …… Glass fiber mat, 20 …… Deli Berry roller, 21 …… Spring, 22 …… Tension roller, 23 ……
Roving, roll of cake or yarn, 24 ... shelf, 25
…… Straight pipe, 26 …… Flexible pipe, 27 ……
Feed roller, 28 …… Guide rod, 29 …… Guide plate, 30
…… Titanium guide, 31 …… Cap, 32 …… Titanium guide, 35 …… Inlet guide, 36 …… Steel pipe, 37 …… Steel plate,
38 …… Guide retainer, 39 …… Titanium guide, 40 …… Entrance guide center line, 41, 42, 43 …… Roller, 44 …… Comb guide

Claims (7)

[Claims] 1. A glass fiber bundle is shaken off on a horizontally arranged belt conveyor to form a non-directional fiber layer, the non-directional fiber layer is dried by a drier, and a unidirectional fiber bundle supply device is used. , Supplying a unidirectional fiber bundle on the dried non-directional fiber layer to laminate the unidirectional fiber layer, in which case the unidirectional fiber bundle is guided in parallel at a constant interval in the width direction, A glass fiber characterized by forming a glass fiber mat by supplying a laminated unidirectional fiber layer and a non-directional fiber layer to a kneader and needing the glass fiber mat, and discharging the glass fiber mat by a delivery roller. Method of manufacturing mat. 2. An apparatus for producing a glass fiber mat by needling a laminated unidirectional fiber layer and a non-directional fiber layer, wherein a belt conveyor arranged horizontally, and a glass fiber on the belt conveyor. A non-directional fiber bundle supply device that shakes the bundle to form a non-directional fiber layer, a dryer that is arranged in front of the non-directional fiber bundle supply device, and a glass fiber bundle is supplied onto the non-directional fiber layer. To form a unidirectional fiber layer, the unidirectional fiber bundle supply device arranged in front of the dryer and the unidirectional fiber bundle supplied from the unidirectional fiber bundle supply device are arranged at regular intervals in the width direction. At the same time, a comb-shaped guide for guiding in parallel, a means for applying a constant tension to the unidirectional fiber bundle supplied from the unidirectional fiber bundle supply device, and the laminated unidirectional fiber layer and non-directional fiber layer. , Needle And a delivery roller arranged in front of the one-way fiber bundle supply device for connecting by a ring, and a delivery roller arranged in front of the needler for discharging the glass fiber mat. Characteristic glass fiber mat manufacturing equipment. 3. The apparatus for producing a glass fiber mat according to claim 2, wherein the unidirectional fiber bundle supply device is a warp beam in which a glass fiber bundle is wound. 4. A pipe and a guide for guiding a glass fiber bundle from a roving, a yarn and a cake by a unidirectional fiber bundle feeding device, and a feed roller driven to rotate the glass fiber bundle onto the non-directional fiber layer. The apparatus for producing a glass fiber mat according to claim 2, wherein the apparatus comprises: 5. A means for applying a constant tension to a unidirectional fiber bundle is an electromagnetic clutch attached to a warp beam or a feed roller, and this electromagnetic clutch operates in synchronization with an intermittently rotating delivery roller, The apparatus for manufacturing a glass fiber mat according to any one of claims 2 to 4, wherein tension is applied to the unidirectional fiber bundle by a braking action. 6. A means for applying a constant tension to a unidirectional fiber bundle is a rotary drive device for a warp beam or a feed roller, and this rotary drive device has a peripheral speed substantially the same as the average take-up speed of a delivery roller which makes intermittent rotary motion. The glass fiber mat manufacturing apparatus according to any one of claims 2 to 4, wherein the unidirectional fiber bundle is rotated by rotating the fiber to apply tension. 7. The tension roller arranged to apply a constant tension to the unidirectional fiber bundle is a tension roller arranged so as to be lightly pressed against the unidirectional fiber bundle.
5. The manufacturing apparatus for a glass fiber mat according to claim 4.