JPS6331583B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention detects the amount of strands fed out from a feeding machine onto a conveyor disposed in a horizontal or almost horizontal position below the feeding machine, and collects the strands in layers on the conveyor based on the detection result. The present invention relates to a method of manufacturing a glass fiber mat while adjusting the moving speed of the conveyor, the payout speed of the payout machine, or both speeds so that the strand distribution density is maintained at a set value. There are two known conventional methods for producing glass fiber mats: One is to arrange multiple strand cutters in the width direction above the conveyor.
One method is to feed a certain amount of strand per unit time, cut it into a predetermined length, and supply it by dropping it uniformly onto a conveyor to obtain a chip strand mat. A fixed amount of strands are fed out per unit time from multiple cakes or rovings by a machine, and based on the reciprocating movement of the feeding machine, the fed strands are collected in a swirl so that they are evenly distributed on a conveyor, and when the strands fall, Another method is to obtain a swirl mat by combining the strands at intertwined points by curing the binder applied after falling, or to obtain a non-woven mat by intertwining the swirl-like layers with vertically moving needles. The mechanical strength and rigidity of the reinforced plastic products are largely controlled by the content and arrangement of the glass fiber mat as a reinforcing material. This will help improve the quality of reinforced plastic products. However, at present, the amount of collection per unit time on the conveyor is reduced due to consumption of individual cakes or rovings during the manufacturing process (completed feeding), unexpected breakage of strands, malfunction of feeding, and various other factors. It is difficult to avoid fluctuations in the amount of cotton. Normally, a large number of cakes and rovings are used to increase pine productivity, and the degree of wear and tear is statistically determined by the fact that the difference between the average value over the entire process and the individual values during the process is within an acceptable range. Although this may be an objective point of view, in reality there is considerable variation in the unit weight distribution. The above-mentioned method was previously proposed by the applicant in view of the above circumstances, and has the following advantages. That is, if one or more of the total number of cakes or rovings is worn out or cut, the amount of strand payout toward the conveyor will decrease, and the distribution density on the conveyor will decrease; If the item that has been worn out or cut is restored and feeding is resumed, the above will be reversed, and the frequency of wear and tear and recovery will fluctuate randomly, and the distribution density will change each time. ,
In the method described above, the amount of strand payout that summarizes the wear and tear, etc., and recovery, which are the causes of changes in the distribution density, is detected, and based on the detection results, the moving speed of the conveyor and the payout of the payout machine are adjusted in the manner described above. Adjusting the relative relationship with the speed, specifically, for example, when the feed amount decreases (increases), (i) the conveyor moving speed is directly proportionally reduced (increased), or (ii) the feed speed (iii) Decrease (increase) the conveyor travel speed and increase (reduce) the payout speed such that the value obtained by dividing the conveyor travel speed by the payout speed is directly proportional to the payout amount. As a result, the strand distribution density on the conveyor can be automatically maintained at a set value at all times, and thereby high-quality glass fiber mats can be produced efficiently. However, the strand dispensing action by the dispensing machine may be in a state where the strand distribution density cannot be maintained at the set value even by the speed adjustment. For example, this is the case when a group of strands among a large number of strands is broken to such an extent that they cannot be fed out by the opposing rollers, and in such a case, it is difficult to do anything without interrupting the work. In this way, the present invention maintains the distribution density at the set value without interrupting the pine manufacturing process even when the amount of strand payout changes significantly enough to impair product quality, regardless of speed adjustment. Its purpose is to enable continuous operation under certain conditions. The characteristic structure of the present invention for achieving the above object is as follows:
In the above-mentioned method for manufacturing glass fiber mat, a preliminary feeding machine is provided on the downstream side of the feeding direction of the conveyor with respect to the feeding machine, and the strand feeding action maintains the strand distribution density at the set value even by the speed adjustment. The strand is fed out onto the conveyor from the preliminary feeding machine in place of the feeding machine that has become unable to operate, and the starting end of the strand fed out from this preliminary feeding machine is transferred from the feeding machine replaced with the preliminary feeding machine. The strand that has already been fed out onto the conveyor is fed to the terminal position to maintain the strand distribution density at a set value, and this configuration provides the following effects. That is, in the process of manufacturing pine by operating a feeding machine, even if the feeding action of the feeding strand is under the speed adjustment, the distribution density of the strands on the conveyor cannot be maintained at the set value. A pre-feeder feeds the strands onto the conveyor without interrupting conveyor operation.
While eliminating the disadvantage of large fluctuations in the strand distribution density, the pine manufacturing process itself can be continued as it is, and the strand distribution density can be adjusted without interrupting the production using the auxiliary operation of the pre-feeding machine. However, in the present invention, in particular, the preliminary feeding machine is provided on the downstream side in the transport direction of the conveyor compared to the normally operated feeding machine, so that stable mats can be manufactured continuously and efficiently. Since the starting end of the strand to be fed out is fed to the end position of the strand that has already been fed out onto the conveyor from the replaced feeding machine with this preliminary feeding machine, the starting end of the strand that has already been fed out from the feeding machine onto the conveyor is used. There is little risk that there will be parts where the amount of strand is too large or too small due to a discrepancy between the end position of the strand fed out from the preliminary feeding machine and the starting position of the strand fed out from the pre-feeding machine. This method has the advantage of producing high-quality glass fiber mat. Next, embodiments of the present invention will be described with reference to the drawings. In Fig. 1 showing an example of the apparatus used in carrying out the method of the present invention, 2... is a cake of glass fiber strands held in large numbers on a clique 1, and 3... is a glass fiber strand cake fed out from this cake 2... Strand 4 is strand 3... and cake 2...
A feeding machine 5 that feeds out the net from the net conveyor 6 and feeds it out toward the net conveyor 6 provided in a horizontal or almost horizontal position below.
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 drive motor for the conveyor 6, 8 is a swirl mat fed onto the conveyor 6 and collected in a swirl shape, 9 is a needler for punching the swirl mat 8, 10 is a non-woven mat, and 11 is its winding roller. Also, as shown in Fig. 2, 12... is a strand guide provided on the axis extension of cake 2..., 13 is a focusing guide for strands 3... group,
14... is a detector for detecting the presence or absence (running or not) of strand 3 near each strand guide 12, that is, whether or not it is contributing to cotton collection; 15 is a detector 14... and a feeding machine. This is a control panel that is interposed in series between either one of the drive motor 5' and the conveyor drive motor 7, or both motors 5' and 7. The control panel 15 has a function of adjusting the input voltage to one motor 5' or 7 or both motors 5' and 7 using the sum of the signals from the detectors 14, that is, the actual number of strands 3... as a control factor. have. If the actual feed amount of the strand 3 is expressed as weight per unit length and is x, and the moving speed of the conveyor 6 is V ₁ , the feed speed is V ₂ , and the effective width of the swirl mat is L, then the conveyor 6 The weight M per unit area of the upper mat 8 is as follows: M=x·V ₂ /L·V ₁ In other words, x=M·L·V ₁ /V ₂ . Since L is a constant, in order to keep M constant regardless of changes in x, (i) If V ₂ is unchanged, make V ₁ directly proportional to x. (ii) If V ₁ is left unchanged, make V ₂ inversely proportional to x. (iii) Both V ₁ and V ₂ are changed so that V ₁ /V ₂ is proportional to x. For example, assuming that x doubles from a certain state, in (i), V ₁ is doubled. In (ii) V ₂
Reduce to 1/2. For these, in (iii), for example, V ₁ is √
2x and V ₂

The adjustment width can be small by using [Formula]. In other words, it is possible to cope with larger fluctuations in x. When motors 5, 5', and 7 are driven, cake 2...
Strand 3... is fed out from ... and focusing guide 1
After being collected at 3, the material is fed by dropping from a 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 numerous strands 3... are worn out or accidentally cut, the detector 14
The total signal 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 7, or both. Therefore, the monomer distribution of the swirl mat 8 is maintained at the set value. A plurality of feeding machines 4 having the above configuration are installed for one common conveyor 6, and the control panels 15...are linked together. This embodiment will be described with reference to a case where two conveyors are arranged in parallel in the moving direction of the conveyor 6.
Among them, the feeding machine that is normally operated is shown as 4a,
The feeding machine 4 is located on the downstream side of the feeding machine 4a in the conveying direction of the conveyor 6, and when the feeding of the strand 3a from the feeding machine 4a is stopped.
A preliminary feeding machine which feeds out the strand 3b in place of the strand a is shown as 4b. For convenience of explanation, the reason why the amount of the strand 3a fed out during operation of the feeding machine 4a is below a certain level is assumed to be due to the end of feeding of the entire bundle of focused strands or unexpected cutting, and the end of the bundle of focused strands is represented by _3a2 , The starting end is represented by 3a ₁ . The feeding of the focused strand bundle from the feeding machine 4a has stopped, and the terminal end _3a2 of this focused strand bundle has reached the reciprocating path of the preliminary feeding machine 4b on the conveyor 6 as shown in Fig. 3 A, B, and C. When, reserve feeding machine 4
drive b. The exact timing of this operation is
Ideally, the starting end 3b ₁ of the bundle of focused strands fed out from the preliminary feeding machine 4b should be set so as to be continuous with the terminal end 3a ₂ as shown in FIG. 3D.
During this time, the feeding machine 4a, which has stopped feeding out the focused strand bundle, is restored and its operation is resumed as shown in FIG. 3E. When the starting end _3a1 reaches the reciprocating path of the preliminary feeding machine 4b, the operation of the preliminary feeding machine 4b is stopped. At this time, the strand 3b fed out from the preliminary feeding machine 4b is cut, and it is ideal to set the timing so that the terminal end _3b2 is connected to the starting end _3a1 of the bundled strand bundle fed out from the feeding machine 4a. . By repeating the above steps, as shown in FIG.
will be manufactured continuously. The above timing settings are based on the conveyor moving speed,
This can be easily done based on the strand feeding speed, the distance between the two feeding machines 4a and 4b, the distance from the terminal end _3b2 detection position to the feeding machine 4a, etc. The cause of the unwinding amount being below a certain level is not due to the end of unwinding the entire bundle of focused strands or accidental cutting.
In overwhelmingly many cases, the number of strands constituting the strand bundle is reduced due to the end of unwinding of individual strands or unexpected cutting, or malfunction. However, the principle is the same in this case as well, and the difference is that when such a situation occurs, the strand 3a is actively cut. In the above example, the detectors 14... detect whether or not the strand is running, but they may also detect the weight per unit length of the strand. 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 are drawings for explaining the method for manufacturing glass fiber mat according to the present invention, in which FIG. 1 is a schematic perspective view showing the method and the apparatus used to carry it out, FIG. 2 is an enlarged side view of a portion, and FIG. Figures A to F are schematic plan views sequentially showing the steps of one means. 3...Strand, 3a ₁ , 3b ₁ ...Starting end, 3
a ₂ , 3b ₂ ... terminal, 4a ... feeding machine, 4b ... preliminary feeding machine, 6 ... conveyor, 8 ... glass fiber mat.

Claims (1)

[Scope of Claims] 1. The amount of the strand 3 fed out from the feeding machine 4a onto the conveyor 6 disposed in a horizontal or almost horizontal position below the feeding machine 4a is detected, and the amount of the strand 3 fed out from the feeding machine 4a is adjusted based on the detection result. A method of manufacturing glass fiber mat 8 while adjusting the moving speed of the conveyor 6, the feeding speed of the feeding machine 4a, or both speeds so that the distribution density of the strands stacked and collected on the top is maintained at a set value. Then, the feeding machine 4
A preliminary feeding machine 4b is provided on the downstream side of the conveyor 6 in the transfer direction from a, and the strand 3 feeding function replaces the feeding machine 4a in which the strand distribution density cannot be maintained at the set value even by the speed adjustment. Then, the strand 3 is fed out from the preliminary feeding machine 4b onto the conveyor 6, and the starting end _3b1 of the strand 3 fed out from the preliminary feeding machine 4b is
Feeding machine 4 replaced with the preliminary feeding machine 4b
A method for manufacturing a glass fiber mat, characterized in that the strand distribution density is maintained at a set value by feeding the strand 3 already fed out onto the conveyor 6 from a to the terminal end _3a2 position. 2. After the strand 3 feeding action by the feeding machine 4a, which has been replaced with the preliminary feeding machine 4b, is restored to a state in which the strand distribution density can be maintained at the set value by the speed adjustment, this feeding machine 4
When the starting end 3a1 of the strand 3 fed out from the feeding machine 4a reaches the feeding position by the preliminary feeding machine 4b, the feeding of the strand ₃ onto the conveyor 6 by the feeding machine 4a is resumed.
The method for manufacturing a glass fiber mat according to claim 1, wherein the feeding of the strands 3 onto the conveyor 6 from b is stopped. 3. The state in which the strand 3 feeding action of the feeding machine 4a is unable to maintain the strand distribution density at the set value even through the speed adjustment is caused by the completion of feeding the strand, the strand being cut midway, or malfunction. A method for producing glass fiber mat according to item 1 or 2.