JPS6331582B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for manufacturing glass fiber mat, which is used as a reinforcing material for reinforced plastic products mainly used in general industry. Alternatively, the present invention relates to a method of manufacturing glass fiber mat by feeding the fibers onto a conveyor in a substantially horizontal position and collecting the fibers in layers.

The following two types of methods are known: One is to arrange multiple strand cutters in parallel in the width direction above the conveyor, feed a fixed amount of strand bundle per unit time from a feeding machine to the strand cutter, cut it into a predetermined length, and distribute it uniformly on the conveyor. One method is to feed the strands falling to obtain a chip strand, and the other method is to feed a fixed amount of strand bundles per unit time from the feeding machine as described above, and to calculate this feeding based on the reciprocating movement of the feeding machine. The resulting strand bundle is collected in a swirl so that it is uniformly distributed on a conveyor, and the glass strands are bonded together at intertwined points by hardening of the binder applied when or after the strand bundle falls, thereby obtaining a swirl mat. Alternatively, a nonwoven mat can be obtained by intertwining this swirl-like layer with needles that are moved up and down.

The mechanical strength and rigidity of the reinforced plastic product are largely controlled by the content and arrangement of the glass fiber mat as a reinforcing material, and the diameter of the glass strands constituting the glass fiber mat also It has a great effect on the abrasion resistance as well as on the defoaming efficiency when glass fiber mat is impregnated with resin. Stabilizing the diameter of the strands leads to improved quality of reinforced plastic products, especially when the diameter of the glass strands varies and there are parts where the diameter of the glass strands is smaller than the specified diameter. For glass fiber mats such as
During resin impregnation work, it is necessary to take special care to defoam the small diameter portions of the glass strands, but this is often neglected, resulting in reinforced plastic products that are inferior in quality due to the inclusion of air bubbles. There is a risk that it will be manufactured.

However, in the past, for example,
As described in Publication No. 23828, a drawing device is used to draw heat-softened glass to form a continuous glass strand, and to bundle the continuous glass strands into a single strand bundle, and to A feeding machine for distributing and dispensing on a conveyor and the conveyor were installed in series to continuously and consistently manufacture everything from raw glass to glass fiber mat, which improved the distribution characteristics of the glass fiber mat and the glass strands. In order to maintain a constant diameter of glass fibers, it is necessary to adopt a method of detecting breaks or partial breaks in the strand bundle and adjusting the conveyor drive speed based on the detection results. Since the manufacturing speed of the mat tends to vary, there is a problem in that the mat cannot be manufactured efficiently.

That is, in order to improve the distribution characteristics of the glass fiber mat described above while manufacturing the glass fiber mat at a constant speed, it is necessary to adjust the driving speed of the drawing device and the feeding machine. This is because, since the drawing speed changes, the diameter of the glass strand being drawn cannot be kept constant, making it impossible to produce a glass fiber mat with stable quality.

In addition, in conventional manufacturing methods, breaks or partial breaks in the strand bundle were detected analogously based on the load or phase fluctuation characteristics of the electric motor that drives the drawing device, making it impossible to control quality with high precision. However, due to this, there was a problem in that the quality was likely to vary.

The present invention has been made in view of the above-mentioned circumstances, and it is possible to produce glass fiber mats by devising a method for supplying a strand bundle to a feeding machine and a method for detecting breakage or partial breakage of a strand bundle. Provided is a method for producing glass fiber mats that is capable of efficiently producing glass fiber mats at a constant speed, while also making it possible to stabilize the distribution characteristics of the glass fiber mats and the diameter of the glass strands, as well as allowing highly accurate quality control. The purpose is to

The characteristic configuration of the present invention for achieving the above object is that, in the above-described glass fiber mat manufacturing method, one glass strand is pulled out from a plurality of aggregates of glass strands that can be pulled out in series and bundled. While the strand bundle is fed out by the feeding machine, a detector is provided to detect the presence or absence of glass strands drawn out from each of the aggregates, and the strand distribution density on the conveyor is determined based on the detection result by this detector. The point is that the feeding speed of the feeding machine is adjusted so as to be kept constant or almost constant, and this configuration provides the following effects.

That is, instead of manufacturing everything from raw material glass to glass fiber mats continuously and consistently, glass strands are individually drawn out from a plurality of aggregates of glass strands that have already been produced and assembled so that they can be pulled out in series. The book is bundled into a strand bundle, and this strand bundle is fed out by a feeding machine, and by adjusting the feeding speed of this feeding machine, the strand distribution density is kept uniform or almost constant.
This is a method that can efficiently produce glass fiber mats by keeping the speed of the conveyor constant, while keeping the diameter of the glass strand constant and ensuring consistent quality in terms of abrasion resistance and work during resin impregnation. Glass fiber mats can be produced with less risk of deteriorating properties.

Furthermore, since the system detects the presence or absence of glass strands being drawn out from each aggregate and adjusts the feeding speed of the feeding machine, the speed can be adjusted based on accurate understanding of the total amount of glass strands being drawn out from the feeding machine. can be adjusted, and quality can be controlled with higher precision than before.

Therefore, while it is a method that can efficiently produce glass fiber mats at a constant speed, it is possible to maintain the distribution characteristics of glass fiber mats and the diameter of the glass strands at a constant level, and to control quality with high precision, making it possible to manufacture glass fiber mats efficiently at a constant speed. It has now become possible to produce glass fiber mats of higher quality.

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

In FIG. 1 showing an example of the apparatus used in the embodiment of the method of the present invention, 2... is a cake as an example of an aggregate of glass fiber strands held on a clique 1 in large numbers, and 3... is this cake 2. The glass strands 4 pulled out from each of the plurality of cakes 2... are directed toward a net conveyor 6 in which a single strand 3' to be bundled is provided in a downward horizontal or almost horizontal position. A feeding machine, 5 is a motor for reciprocating the feeding machine 4 in the width direction of the conveyor 6, 5' is a drive motor for the feeding machine 4, 7 is a driving motor for the conveyor 6, and 8 is a motor for reciprocating the feeding machine 4 in the width direction of the conveyor 6. A swirl mat is laminated and collected in a swirl shape, 9 is a needler for punching the swirl mat 8, 10 is a non-woven mat, 11 is its winding roller, and as shown in FIG. 2, 12... is a cake 2 Strand guide provided on the axis extension of ..., 13 is glass strand 3
. . group focusing guide; 14 . . . is a detector for detecting the presence or absence (travelling) of the glass strands 3 near each strand guide 12, that is, whether or not they are contributing to cotton collection; 15 is a detector 14 and the feeder drive motor 5', or between the detector 14... and both motors 5', 7.
It is a control panel connected and interposed between the

The control panel 15 calculates the sum of the signals from the detectors 14...
In other words, it has a function of adjusting the input voltage to the payout machine drive motor 5' or both motors 5' and 7 using the actual number of glass strands 3 as a control factor.

The actual payout amount of the glass strand 3 is expressed as the weight per unit length, and this is x, and the conveyor 6
When the moving speed of the mat 8 is V ₁ , the feeding speed is V ₂ , and the effective width of the swirl mat is L, the weight M per unit area of the mat 8 on the conveyor 6 is M=x・V ₂ /L・V ₁ , that is, x = M・L・V ₁ /V ₂ .

Since L is a constant, in order to keep M constant regardless of changes in x, V ₁ should remain unchanged and V ₂ should be adjusted in inverse proportion to x. For example, if the amount of x is halved from a predetermined state, Then, double V ₂ .

In addition, if the input voltage to both motors 5' and 7 is made adjustable by the control panel 15 and both V ₁ and V ₂ are changed so that V ₁ /V ₂ is proportional to x, the glass fiber mat Larger variations in x can be accommodated, although some variations in manufacturing speed will occur.

When motors 5, 5', and 7 are driven, cake 2...
Glass strand 3 is fed out from the focusing guide 1
At 3, the strands are collected into a strand bundle 3' and are fed down from the feeder 4 onto a conveyor 6 below. The feeder 4 is driven by a motor 5' and reciprocated by the motor 5, while the conveyor 6 rotates, so that the supply strand bundle 3' is laminated and collected in a swirl to form a continuous swirl mat 8.

When one or more of the many glass strands 3 are worn out or accidentally cut, the detector 1
4. The sum of signals from... fluctuates. Also, it fluctuates even if the worker recovers after wear and tear. Based on this variation, the control panel automatically adjusts the rotational speed of motor 5' or both motors 5' and 7. Therefore, the unit weight distribution of the swirl mat 8 is kept constant or almost constant.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the method for manufacturing glass fiber mat according to the present invention, with FIG. 1 being a schematic perspective view showing the method and the apparatus used to carry it out, and FIG. 2 being an enlarged side view of a portion thereof. 2...Aggregation, 3...Glass strand, 3'...
... Strand bundle, 4 ... Feeding machine, 6 ... Conveyor, 8 ... Glass fiber mat, 14 ... Detector.

Claims (1)

[Scope of Claims] 1. A method for manufacturing a glass fiber mat 8 by feeding a strand bundle 3' from a feeding machine 4 onto a conveyor 6 in a horizontal or nearly horizontal position disposed below the feeding machine 4 and collecting the strands in a laminated manner. The glass strands 3 are pulled out from a plurality of aggregates 2 of glass strands 3 that can be drawn out in series, and one strand bundle 3' which is bundled is fed out by the feeding machine 4, and from each of the aggregates 2. A detector 14 is provided to detect the presence or absence of the glass strand 3 to be drawn out, and based on the detection result by this detector 14,
A method for manufacturing glass fiber mat, characterized in that the feeding speed of the feeding machine 4 is adjusted so that the distribution density of the strands on the conveyor 6 is kept constant or almost constant. 2 The feeding speed of the feeding machine 4 is determined by the feeding speed of the feeding machine 4.
4. The method for manufacturing a glass fiber mat according to claim 1, wherein the adjustment is made in inverse proportion to the number of glass strands 3 whose presence is detected by the glass fiber mat.