JPH08284055A - Production of cloth lay web and production apparatus therefor - Google Patents

Abstract

PURPOSE: To provide both a method for producing cross lay web and a device for producing it. CONSTITUTION: In a method for producing a cross lay web by supplying a web from a carding machine through a carding machine, a web transporting means 21 and an accumulating means 5 to a web laminating and transporting means, the web sending speed of the carding machine is periodically changed to increase and reduce weight, the web transporting distance in the accumulating means is changed correlatively with the periodic change of the web sending speed and the web sending speed of the accumulating means is made constant. A web is supplied to the web laminating and transporting means from the web transporting means which performs reciprocating movement at a fixed speed so as to laminate web parts with light weight to both end parts of a cross lay web, and the transporting speed of the web laminating and transporting means is made constant to produce the objective cross lay web.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for manufacturing a crosslay web. By the method of the present invention or the apparatus of the present invention, it is possible to manufacture a crosslay web having a substantially uniform thickness in the width direction.

[0002]

2. Description of the Related Art As shown in FIG.
0 is formed by obliquely deflecting the long web 9 and alternately folding back the web 9 in the lateral direction, and stacking the webs one after another.
It is an intermediate product in the non-woven fabric manufacturing process. In a general manufacturing method, the cross ray web transfer is performed on the cross ray web transfer unit (for example, a floor conveyor) 4 that moves at a substantially constant speed in the direction indicated by the arrow B in a direction substantially orthogonal to the arrow B. An elongated web 9 is fed from above at a substantially constant rate between the lateral ends of the section 4. Therefore, the long web 9 is obliquely folded back at a position that constitutes one end of the cross-lay web on the cross-lay web transport unit 4, and the webs are stacked so that a part of the webs overlap each other, and further, on the other side. The webs are obliquely folded back in the opposite directions at the positions forming the ends, and the webs are stacked again so that some of the webs overlap each other, and the structure is repeated periodically. In order to stabilize the quality of the completed crosslay web 10, an angle θ (hereinafter referred to as a web orientation angle) between the manufacturing direction of the crosslay web at the time of manufacturing indicated by arrow B and the length direction of the elongated web indicated by arrow C. Called)
However, it is desirable that it is constant.

As shown in FIG. 2, the conventional typical cross-ray web manufacturing apparatus mainly comprises a card machine 1 and a cross-layer apparatus 7. The cross layer device 7 includes a web transporting means 2 including a climbing apron 23 and a fall apron 24, and a web stacking and transporting means 8 having a crosslay web transporting section (for example, a floor conveyor) 4.
And further includes a web receiving portion 2 of the fall apron 24.
Carriage means 3 is provided which reciprocates the entire fall apron 24 in the direction indicated by arrow A with the web feeding portion 22 as the tip and the fulcrum 6 as a fulcrum. When a crosslay web is manufactured using this manufacturing apparatus, the card machine 1
Thus, the raw material fibers are opened to form the web 9, and the web 9 delivered from the web delivery section 6 of the card machine 1 is supplied from the climbing apron 23 of the web transporting means 2 to the fall apron 24. The web 9 is supplied onto the floor conveyor 4 from a web delivery section 22 which is the tip of a fall apron 24 that reciprocates in the direction indicated by arrow A.
Since the floor conveyor 4 is traveling in the direction substantially orthogonal to the reciprocating motion, the webs 9 are alternately folded and stacked one after another on the floor conveyor 4 to form a crosslay web. . The direction of conveyance of the web 9 is indicated by arrow F.

In a typical conventional method using this apparatus, the feeding speed of the web fed from the web feeding portion 6 of the card machine 1, the web feeding speed of the web feeding means 2, and the web feeding portion 22 of the web feeding means 2 are used. The delivery speed of the web to be delivered and the web transport speed of the cross-lay web transport unit 4 were set to be substantially constant. Further, the reciprocating motion of the carriage device 3 which reciprocates in the direction indicated by the arrow A is kept at a substantially constant speed except when the both ends of the crosslay web are reversed, so that the thickness of the crosslay web is maximized. It has been attempted to make them uniform and make the web orientation angle at the time of lamination as constant as possible.

However, since the reciprocating motion of the carriage means 3 is always stopped at the time of reversing, the reciprocating speed decreases before and after the reversing of both ends, so that the web stacking amount at both ends is in the central part. More than. Further, in order to prevent wrinkles from being generated in the crosslay web, tension is applied to the webs stacked on the crosslay web transport unit 4. When the tension acting on the crosslay web is released after the laminating process is completed, the crosslay web contracts, but the resistance force derived from the weight of the web is large in the central part and small in both ends, so the contraction method is It is not uniform in the width direction and tends to shrink more at both ends than at the central part. Therefore, both ends of the contracted cross-lay web were thick, and the thickness in the width direction was not uniform.

As a means for solving this problem, the web feeding speed from the web feeding portion 22 of the fall apron 24 and the traveling speed of the crosslay web conveying portion 4 are kept constant, and the reciprocating movement of the web feeding portion 22 is performed. There is a method to control the maximum speed at both ends of the crosslay web. That is, the reciprocating motion of the web sending unit 22 is accelerated by the carriage means 3 so as to reach the maximum speed at both ends of the cross-lay web, and the supply amount to the cross-lay web carrying unit 4 is reduced and the cross-lay web carrying is carried out. By applying tension to the web on the portion 4, it is possible to manufacture a crosslay web having a small basis weight at both ends.

However, since the tension that can be applied to the web is limited, the effect of the tension is limited. In addition, the crosslay web transport unit 4
While the speed (line speed) is constant, the feed speed (laying speed) from the web feeding portion 22 of the fall apron 24 changes, so that the orientation angle is as shown by the broken line C ′ in FIG. θ is deviated and adversely affects the quality of the product. Further, since the web sending unit 22 of the fall apron 24 needs to be stopped at the time of reversing at both ends of the crosslay web, it gives the maximum deceleration from acceleration to the maximum speed immediately before the stop and immediately after the reversal. The mechanical load becomes extremely large because it is necessary to apply acceleration from the stop to the maximum speed, and immediately after that, to rapidly reduce the speed to reach the laying speed in the central region. Further, even if such a method is carried out, the thickness control is at most about several percent, and a sufficient effect cannot always be obtained.

As another solution, a manufacturing method has been proposed in which the weight per unit area of a web sent out from a card machine is periodically increased and decreased, and a web with a small weight per unit is laminated on both ends (US Pat. 5,060,347 or JP-A-6-116853). In these methods, the feed amount of the raw material fiber to the card machine per unit time is kept constant, and the feed rate of the web fed from the card machine is increased or decreased to increase or decrease the basis weight of the web. In other words, when the speed of sending the web sent from the card machine is increased, the weight of the web sent from the card machine is reduced, and conversely, when the speed of sending the web sent from the card machine is slowed, the weight of the web sent from the card machine is decreased. The basis weight of the delivered web is large. The cyclic changes of the basis weight and the delivery speed are synchronized with the reciprocating motion of the carriage means 3, and webs having a low basis weight are laminated on both ends.

However, even in these manufacturing methods, while the line speed of the cross-lay web transporting section 4 is constant, the laying speed by the carriage means 3 changes, and as shown by the broken line C'in FIG. Then, the orientation angle θ is deflected. Further, since the web feeding portion 22 of the fall apron 24 needs to have the maximum speed before and after the both ends of the crosslay web, the mechanical load becomes extremely large as described above.

[0010]

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a conventional method such as a mechanical load generated when the reciprocating movement of the web feeding portion is reversed by the carriage means and a quality variation caused by a change in orientation angle. SUMMARY OF THE INVENTION It is an object of the present invention to provide a method and an apparatus for manufacturing a cross-lay web having a uniform thickness in the width direction by solving the above problem.

[0011]

SUMMARY OF THE INVENTION According to the present invention, the above-mentioned object is to supply a web fed from a card machine to a web conveying means, and from a web feeding portion of the web conveying means, to a crosslay of the web stacking conveying means. In a method of manufacturing a cross-lay web, which comprises supplying to a web transport section,
By periodically changing the web delivery speed of delivering the web from the card machine, the basis weight of the web delivered from the card machine is periodically increased or decreased, and the web delivery section of the card machine and the web transporting means. A web accommodating section, or an accumulator means in the middle of the web transporting means, and correlates with a periodical change in the web sending speed from the card machine so that the web sending speed from the card machine is cyclic. By increasing the web transport distance in the accumulating means as the speed becomes faster, and shortening the web transport distance in the accumulating means as the web sending speed from the card machine becomes cyclically slower. The web feeding speed for feeding is made substantially constant, and the web feeding portion of the web conveying means is substantially moved by the carriage means. The reciprocating motion is performed at a constant speed, and a cyclic change in the web feeding speed from the card machine and the reciprocating movement by the carriage means are performed so that the web portions having a small basis weight are laminated on both ends of the crosslay web. Correlating with movement, the web is fed at a substantially constant speed from the web sending section of the web transporting means to the crosslay web transporting section of the web stacking transporting means, and the web stacking transporting means of the web stacking transport means is supplied. This can be achieved by the above method for manufacturing a crosslay web, which is characterized in that the transport speed of the crosslay web transport unit is set to be substantially constant.

Further, the above-mentioned object is, according to the present invention, a card machine for delivering a web; a web carrying means for receiving and carrying a web sent from the card machine; and a web sending part of the web carrying means. A web stacking and conveying means for receiving and conveying webs while laminating the web; a carriage means for causing a web delivering portion of the web conveying means to reciprocate at a substantially constant speed; a web delivering portion of the card machine and the web conveying Accumulating means arranged between the web receiving portion of the means or in the middle of the web conveying means;
A crosslay web manufacturing apparatus including: a control unit; wherein the control unit periodically changes a web delivery speed at which the web is delivered from the card machine, so that the basis weight of the web delivered from the card machine is changed. The amount is periodically increased / decreased and correlated with the periodic change in the web delivery speed from the card machine, and the web transport distance in the accumulating means is increased as the web delivery speed from the card machine is periodically increased. By increasing the web feeding speed from the card machine and periodically changing the web conveying distance in the accumulating means as the web feeding speed from the card machine becomes slower, the web feeding speed sent from the accumulating means becomes substantially constant, and the basis weight is increased. The web feed speed from the card machine is changed cyclically so that the web portion with less heat is laminated on both ends of the crosslay web. And correlating the reciprocating movement by the carriage means, from the web sending section of the web carrying means to the cross-lay web carrying section of the web stacking and carrying means, supplying the web at a substantially constant speed, Further, it can be achieved by the above-mentioned crosslay web manufacturing apparatus, characterized in that the transport speed of the crosslay web transport section of the web stacking transport means is set to a substantially constant speed.

The present invention will be described below with reference to the accompanying drawings. The card machine used in the present invention is an apparatus for opening a raw material fiber to produce a web. For example, the card machine 1 shown in FIG. 2 which has been conventionally used can be used as it is. In the card machine 1, first, raw material fibers are carded by a plurality of workers (not shown) and a stripper (not shown) on a main cylinder (not shown) to form a web in which the fiber directions are aligned. To do. This web is sent to the doffer 14, stripped from the doffer by the stripping roll 15, passes between the fluted roll 16a and the smooth roll 16b, and passes through the web delivery unit 6
And is supplied to the next web conveying means or accumulating means.

In the present invention, the feed amount of the raw material fiber to the card machine per unit time is kept constant, and the delivery speed of the web delivered from the card machine is periodically increased or decreased to obtain the weight of the web. Increase or decrease periodically. That is, when the web sending speed of the card machine is slowed down, the basis weight of the web to be sent out is large, and when the web sending speed of the card machine is fast, the basis weight of the sent web is small. In the present invention, the web delivery speed of the card machine and the periodic increase / decrease in the weight per unit area of the web delivered from the card machine are correlated. The feeding speed of the web fed from the card machine, and therefore the increase / decrease in the basis weight, can be adjusted by a known method, for example, the doffer 14 or stripping roll 15 shown in FIG. 2, the compact roll 17 shown in FIG.
Alternatively, it can be controlled by changing the rotation speed of the drafter 18 shown in FIGS. 4 and 5.

The web conveying means 2 used in the present invention has a climbing apron 23 to which supporting rolls at both ends are fixed and a fixed supporting roll at one end as a fulcrum, as shown in FIG. , A fall apron 24 capable of reciprocating movement with a support roll at the other end. The web transfer means 2 moves the web delivered from the card machine 1 at a substantially constant speed and supplies it to the crosslay web transfer part 4. For the climbing apron 23 and the fall apron 24, conventionally known means such as a belt conveyor can be used. As shown in FIG. 2, the climbing apron 23 is not limited to a mode in which the web is conveyed slightly upward, and may be a mode in which the web is conveyed in a substantially horizontal direction or slightly downward. The fall apron 24 also preferably has a mode in which the center line of the crosslay web is set as the midpoint of the reciprocating motion, as shown in FIG. 2, but the present invention is not limited to this mode. It may be located off the center line of the web. Although a vertical type device has been described here as the web transfer means 2, a conventionally known horizontal type device can also be used.

The web delivery section 22 of the fall apron 24
A floor conveyor 4, which is a cross-lay web transporting unit, travels at a substantially constant transport speed in a direction perpendicular to the plane of FIG. The web feeding portion 22 which is the tip portion of the fall apron 24 reciprocates at a substantially constant speed in the direction of arrow A by the carriage means 3, so that the web feeding portion 22 of the fall apron 24 crosses the web. The web 9 can be supplied to the transport unit 4. At this time, the web 9 passes through the web delivery portion 22 of the fall apron 24 at a substantially constant speed. The supplied webs 9 are alternately folded and laminated on the floor conveyor 4 to form a crosslay web.

In the present invention, the web delivery section 6 of the card machine 1 and the web delivery section 22 of the web transfer means 2 are used.
The accumulating means is arranged at an arbitrary position between and, and correlates with the periodic increase / decrease of the web sending speed from the card machine 1, and as the web sending speed from the card machine 1 becomes periodically high, By increasing the web conveying distance in the accumulating means and changing the web conveying distance in the accumulating means to be shorter as the web feeding speed from the card machine 1 becomes slower, the web feeding sent from the accumulating means. Make the speed substantially constant. The accumulating means is provided, for example, between the web sending section 6 of the card machine 1 and the web receiving section 21 of the web carrying means 2.
Alternatively, it may be arranged in the middle of the web transfer means 2, preferably near the web transfer part 6 of the card machine 1, in the middle of the web transfer means 2, and more preferably in the web transfer part 6 of the card machine 1. And the web receiving portion 21 of the web transfer means 2 are arranged.

According to the present invention, although the web delivery speed of the card machine periodically increases and decreases, the web is finally delivered to the web delivery section 22 of the crosslay web transport section 2 by providing the accumulating means. It can be fed at a substantially constant rate. Further, by providing the accumulating means, the tension applied to the web can be kept constant, and the web can be prevented from wrinkling.

Specific embodiments of the accumulating means that can be used in the present invention will be described below with reference to FIGS. 6 to 9. In FIG. 6, a belt conveyor 51 is provided between the web sending section 6 of the card machine 1 and the web receiving section 21 of the web transporting means 2, and includes a pair of movable rolls 52a and 52b and four fixed rolls 53a, 53b and 53c. , 53d having a structure for rotating the locus defined by 53d.
The mode which arranged is shown.

Four fixed rolls 53a, 53b, 53
c, 53d and a pair of two movable rolls 52a, 52b
Are arranged so that their axial directions are parallel to each other, and the four fixed rolls 53a, 53b, 53c, 53d are arranged at the respective vertices of a rectangle (including a square) when viewed from the axial direction.
The fixed roll 53a is close to the web delivery section 6 of the card machine 1, and the fixed roll 53b is the web transporting means 2.
It is provided in the vicinity of the web receiving portion 21. The pair of movable rolls 52a and 52b maintain the distance between the two rolls at a constant value, and set a substantially midpoint of a side between the fixed rolls 53a and 53b and a substantially midpoint of a side between the fixed rolls 53c and 53d. It is possible to move in the direction of arrow D on the connecting straight line. The pair of movable rolls 52a and 52b is movably held within a predetermined range by a suitable holding means (not shown).

The belt conveyor 51 passes outside the four fixed rolls 53a, 53b, 53c and 53d and passes inside the two movable rolls 52a and 52b, respectively. In the locus of the belt conveyor 51 thus formed, the range from the surface where the belt conveyor 51 contacts the fixed roll 53a to the surface where the belt conveyor 51 contacts the movable roll 52a to the surface contacting the fixed roll 53b is the web transport unit 5
4, the web 9 sent from the web sending unit 6 of the card machine 1 is received, and the web receiving unit 2 of the web transporting unit 2 is received.
Send to 1.

Since the pair of movable rolls 52a and 52b move in the direction D connecting the respective axes of the movable rolls, the trajectory of the belt conveyor 51 changes as the movable rolls 52a and 52b move. A pair of movable rolls 52a,
The range of movement of 52b is four fixed rolls 53a, 53.
It is preferable that the inside of the movable rolls 52a and 52b does not exceed the range of the sides of the rectangle formed by the belt conveyor that passes b, 53c, and 53d.

As shown by the solid line in FIG. 6, when the movable rolls 52a and 52b are lowered to a position where the surface of the movable roll 52a in contact with the belt conveyor 51 substantially coincides with the side between the fixed rolls 53c and 53d, the belt conveyor is moved. 5
1 is the locus shown by the solid line, and the distance of the web transport unit 54 in the accumulation means is the maximum. On the other hand, the movable roll 5
When 2a and 52b move up to the positions shown by the broken lines, the belt conveyor 51 takes the locus shown by the broken lines, and the distance of the web transfer unit 54 in the accumulation means becomes the minimum. By moving the pair of movable rolls 52a and 52b continuously,
The distance of the web transport section 54 in the accumulating means can be continuously changed between the maximum distance and the minimum distance. FIG. 6 shows a web transport unit 54 in the accumulation means.
Only the conveyance path of the web 9 when the distance is substantially maximum is shown, and the conveyance path of the web 9 in other cases (for example, when the web conveyance distance in the accumulating means is minimum) is omitted.

When the delivery speed of the web 9 delivered from the web delivery section 6 of the card machine 1 is periodically increased or decreased, the position of the pair of movable rolls 52a and 52b is controlled by an appropriate control means (not shown) in correlation with it. ) To change the distance of the web transfer unit 54 in the accumulation means. As a result, the web feeding speed of the accumulating means, that is, the feeding speed to the web conveying means 2 can be made substantially constant.

In FIG. 7, as another mode of the accumulating means 5, a movable guide roll 55 and a fixed roll 56 are arranged between the web sending part 6 of the card machine 1 and the web receiving part 21 of the web transporting means 2. The accumulating means 5 is shown. It is preferable that the fixed roll 56 is fixedly installed on the web receiving portion 21 of the web conveying means 2 and is provided on a substantially horizontal plane with the web sending portion 6 of the card machine 1. On the other hand, the movable guide roll 55 capable of translating the web feeding unit 6 of the card machine 1 and the fixed roll 56 substantially in the middle point in the direction of the arrow E is the web guiding unit 6 of the card machine 1.
And the fixed roll 56. The movable guide roll 55 is movably held within a predetermined range by an appropriate holding means (not shown).

The web 9 delivered from the web delivery section 6 of the card machine 1 passes under the movable guide roll 55, passes between the fixed roll 56 and the web receiving section 21 of the web transport means 2, It is sent to the web transfer means 2. As shown by the solid line in FIG. 7, when the movable guide roll 55 descends, the transported web 9 passes through the trajectory shown by the solid line, and the web transport distance in the accumulation means (in this mode, the web delivery of the card machine 1 is sent out. The distance from the part 6 to the fixed roll 56) is maximum.

On the other hand, when the movable guide roll 55 rises to the position shown by the broken line, the conveyed web 9 follows the locus shown by the broken line, and the web conveying distance in the accumulating means becomes the minimum. By continuously moving the movable guide roll 55, the web conveying distance in the accumulating means can be continuously changed between the maximum distance and the minimum distance.

When the delivery speed of the web 9 delivered from the web delivery section 6 of the card machine 1 is periodically increased or decreased, the position of the movable guide roll 55 is changed in correlation with the appropriate control means (not shown). Then, the web transport distance in the accumulation means is changed. As a result, the web feeding speed of the accumulating means, that is, the feeding speed to the web conveying means 2 can be made substantially constant. Although the structure shown in FIG. 7 has a simple structure, it can be easily used when the difference between the maximum distance and the minimum distance of the web conveyance distance is about 25 cm or less. Further, it is preferably used when the entanglement of the fibers of the web is strong. In FIG. 7, the solid line indicates the conveyance path of the web 9 when the web conveying distance in the accumulating means is maximum, and the broken line indicates the case where the web conveying distance in the accumulating means is minimum.
The transport route in other cases is omitted.

FIG. 8 shows a web feeding section 6 of the card machine 1 and a web transporting means 2 as another mode of the accumulating means.
, A pair of rotatable conveying means (for example, a belt conveyor) having a fixed end and a free end, that is, a web receiving side conveying means (for example, a receiving side belt conveyor 63) and a web. The accumulating means 5 having a delivery side transport means (for example, a delivery side belt conveyor 66) is shown. The receiving-side belt conveyor 63 is held at a fixed distance by a fulcrum roller 61 and a free-end roller 62, which are fixedly installed near the web feeding section 6 of the card machine 1, and the feeding-side belt conveyor 66 is It is held at a constant distance by a fulcrum roller 64 and a free end roller 65, which are fixedly installed in proximity to the web receiving portion 21 of the web conveying means 2. The receiving-side belt conveyor 63 can rotate about the fulcrum roller 61 in the direction indicated by G in the range from the lower limit indicated by the solid line to the upper limit indicated by the broken line in FIG. On the other hand, the belt conveyor 66 on the delivery side also includes the fulcrum roller 6
It is possible to rotate in the direction indicated by H in the range from the lower limit indicated by the solid line to the upper limit indicated by the broken line around the point 4.

When the receiving side belt conveyor 63 and the sending side belt conveyor 66 are at the lower limit position shown by the solid line, the web 9 sent from the web sending section 6 of the card machine 1 is
It is conveyed on the receiving side belt conveyor 63, then on the sending side belt conveyor 66, and is supplied to the web receiving portion 21 of the web conveying means 2. In this case, the web conveying distance in the accumulating means substantially corresponds to the sum of the total length of the receiving side belt conveyor 63 and the total length of the sending side belt conveyor 66, and becomes the maximum.

On the other hand, when the receiving side belt conveyor 63 and the sending side belt conveyor 66 are at the upper limit position shown by the broken line, the web 9 sent from the web sending section 6 of the card machine 1 moves on the receiving side belt conveyor 63. It is conveyed and then conveyed on the delivery side belt conveyor 66 and supplied to the web receiving section 21 of the web conveying means 2. In this case, a part of the reception side belt conveyor 63 and the delivery side belt conveyor 6 are provided.
Since a part of 6 is overlapped, the web conveying distance in the accumulating means is substantially equivalent to the distance between the fulcrum roller 61 and the delivery side fulcrum roller 64, and becomes the minimum.

By continuously moving the receiving side belt conveyor 63 and the sending side belt conveyor 66, the web conveying distance in the accumulating means can be continuously changed between the maximum distance and the minimum distance. . Similar to FIG. 7, FIG. 8 shows the transport path of the web 9 in the case where the web transport distance in the accumulating means is maximum by a solid line,
The case where the web conveying distance in the accumulating means is the minimum is shown by a broken line, but the conveying path in other cases is omitted. When the delivery speed of the web 9 delivered from the web delivery unit 6 of the card machine 1 is periodically increased or decreased, the receiving side belt conveyor 63 and the delivery side belt conveyor 63 are correlated by appropriate control means (not shown). The position of 66 is changed to change the web transport distance in the accumulation means. This allows the web delivery speed of the accumulation means,
That is, the feeding speed to the web conveying means 2 can be made substantially constant.

FIG. 9 shows another embodiment of the accumulating means 5, which is a web sending section 6 of the card machine 1 and a web conveying means 2.
The web receiving portion 21 of the fixed web receiving side conveying means (for example, the receiving side belt conveyor 73), and the rotatable web sending side conveying means having the fixed end and the free end (for example, The accumulating means 5 with the delivery side belt conveyor 76) is shown. Receiving side belt conveyor 73
Is a fixed roller a71 and a fixed roller b72 which are fixedly installed in the vicinity of the web sending unit 6 of the card machine 1.
It is held at a fixed distance, and the belt conveyor 7 on the delivery side
Reference numeral 6 denotes a fulcrum roller 74 and a free end roller 75, which are fixedly installed near the web receiving portion 21 of the web conveying means 2.
With the fulcrum roller 74 as a center, the fulcrum roller 74 can be rotated in the direction indicated by J in the range from the lower limit indicated by the solid line to the upper limit indicated by the broken line in FIG.

When the delivery side belt conveyor 76 is at the lower limit position shown by the solid line, the web 9 delivered from the web delivery section 6 of the card machine 1 is conveyed on the receiving side belt conveyor 73, and then the delivery side belt. It is conveyed on the conveyor 76 and supplied to the web receiving section 21 of the web conveying means 2. In this case, the web transport distance in the accumulator is
Substantially, it corresponds to the sum of the total length of the receiving side belt conveyor 73 and the total length of the sending side belt conveyor 76, which is the maximum.
On the other hand, when the delivery-side belt conveyor 76 is at the upper limit position shown by the broken line, the web 9 delivered from the web delivery unit 6 of the card machine 1 does not pass through the receiving-side belt conveyor 73 and is delivered directly. It is sent to the belt conveyor 76, carried on the sending side belt conveyor 76, and supplied to the web receiving section 21 of the web carrying means 2. in this case,
The web conveying distance in the accumulating means substantially corresponds to the distance between the receiving-side fixed roller a71 and the sending-side fulcrum roller 74 and becomes the minimum.

By continuously moving the delivery side belt conveyor 76, the web conveying distance in the accumulating means can be continuously changed between the maximum distance and the minimum distance. In FIG. 9, as in FIG. 7, the solid line indicates the conveyance path of the web 9 when the web conveying distance in the accumulating means is maximum, and the broken line indicates the case where the web conveying distance in the accumulating means is minimum. However, the transport route in other cases is omitted.

When the delivery speed of the web 9 delivered from the web delivery section 6 of the card machine 1 is periodically increased or decreased, the position of the delivery side belt conveyor 76 is correlated with an appropriate control means (not shown). To change the web transport distance in the accumulation means. As a result, the web feeding speed of the accumulating means, that is, the feeding speed to the web conveying means 2 can be made substantially constant.

In the embodiment shown in FIG. 9, the belt conveyor on the web receiving side is a fixed type and the belt conveyor on the web sending side is a rotatable type. However, the belt conveyor on the sending side is fixed, It is also possible to make the receiving side belt conveyor rotatable.

As a special mode of the accumulating means, when the web itself has sufficient strength, a sufficient distance is provided between the web sending part of the card machine and the web receiving part of the web carrying means. May be provided and the conveyance distance may be adjusted by the slack of the web. That is, the web passing between the web sending part of the card machine and the web receiving part of the web transfer means has a space in which it can descend in the direction of gravity due to its own weight. It may be provided between the web receiving part and the web receiving part. In this case, when the web delivery speed from the card machine periodically increases, the slack of the web increases in the above interval, and when the web delivery speed from the card machine periodically decreases, the slack of the web in the above interval decreases. . When the above-mentioned interval is provided between the web sending section of the card machine and the web receiving section of the web conveying means, it is lowered in the direction of gravity between the web sending section of the card machine and the web receiving section of the web conveying means. It is preferable to provide a means (for example, a pressing roll provided in combination with the belt conveyer of the web conveying means) for pulling up the slack portion of the formed web to the web receiving portion of the web conveying means.

In the prior art in which the basis weight of the web and the delivery speed are correlated in the card machine, the web delivered from the card machine 1 is conveyed to the fall apron 24 while being accompanied by the speed change at the time of delivery. However, there is a drawback that a large mechanical load is generated when reciprocating the reciprocating motion by the carriage means. On the other hand, in the present invention,
Since the web having a changed basis weight is conveyed at a constant speed to the web feeding portion 22 at the tip of the fall apron 24, the reciprocating motion of the carriage means is kept substantially constant, and the reciprocating motion of the carriage means is reversed. The mechanical load can be reduced.

Here, the reciprocating motion at a substantially constant speed means that the front end of the web supplied from the web feeding section 22 at the front end of the web conveying means 2 onto the floor conveyor 4 is one end of the crosslay web. After moving at a constant speed from one part to the other end, stop and reverse to reverse at the end, move in the opposite direction at the same speed, then stop and reverse again at the end, The same exercise is repeated. Ideally, the stopping / reversing time is preferably 0, and in reality, the shorter the stopping / reversing time is, the more preferable. Such reciprocating motion can be performed by a conventionally known means, for example, a reversing clutch system, or an AC servo motor or a DC servo motor.

In the present invention, the periodic increase / decrease of the weight per unit area of the web sent out from the card machine and the reciprocating motion of the carriage means are correlated by an appropriate control means so that the web portion having the smaller weight per unit area is cross-laid. Laminate on both ends. As described above, generally, the contraction that occurs in the crosslay web is larger at both ends than in the central part, so that both ends are thicker. In the present invention, since the weight of the web laminated on both end portions is smaller than that in the central portion, it is possible to manufacture a crosslay web in which the thickness in the width direction is substantially uniform after shrinkage occurs. .

In the present invention, a conventionally known device can be used as the web laminating and conveying means, and the conveying speed of the cross-lay web conveying section on the web laminating and conveying means is kept substantially constant, so that the web of the web conveying means 2 can be used. The web from the sending unit 22 can be received. The crosslay web thus obtained can have a more uniform alignment angle θ as compared with the crosslay web obtained by the conventional method, and the thickness of the crosslay web after releasing the tension can be made more uniform. be able to. Further, in the present invention, a conventionally known device is used as the control means, and the card machine, the web conveying means, the accumulating means, the carriage means, and the web stacking conveying means are controlled by the above-mentioned specific method.

[0043]

According to the present invention, it is possible to manufacture a crosslay web having a uniform thickness in the width direction. Further, it is possible to reduce the mechanical load generated when the reciprocating motion is reversed by the carriage means. Furthermore, since the orientation angles of the webs laminated on the floor conveyor can be made uniform, the quality can be stabilized.

[Brief description of drawings]

FIG. 1 is a plan view of a crosslay web laminated on a crosslay web transport unit of a cross layer device.

FIG. 2 is an explanatory view schematically showing a crosslay web manufacturing apparatus according to a conventional method.

FIG. 3 is an explanatory view schematically showing another embodiment of the web sending unit of the card machine that can be used in the present invention.

FIG. 4 is an explanatory view schematically showing still another embodiment of the web sending unit of the card machine that can be used in the present invention.

FIG. 5 is an explanatory view schematically showing still another embodiment of the web feeding section of the card machine that can be used in the present invention.

FIG. 6 is an explanatory view schematically showing one embodiment of the accumulating means that can be used in the present invention.

FIG. 7 is an explanatory view schematically showing another embodiment of the accumulating means that can be used in the present invention.

FIG. 8 is an explanatory view schematically showing still another embodiment of the accumulating means that can be used in the present invention.

FIG. 9 is an explanatory view schematically showing still another embodiment of the accumulating means that can be used in the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Card machine; 2 ... Web transport means; 3 ... Carriage means; 4 ... Floor conveyor; 5 ... Accumulation means; 6 ... Card machine web sending section; 7 ... Cross layer device; 8 ... Web stacking transport means; 9 ... Web 10 ... Cross Ray Web; 14 ... Doffer; 15 ... Stripping Roll; 1
6a ... fluted roll; 16b ... smooth roll; 17 ... compact roll; 18 ... drafter; 21 ...
Web transport means Web receiving section; 22 ... Web transport means Web sending section; 23 ... Climbing apron; 24 ... Fall apron; 25 ... Climbing apron Web sending section; 26 ... Fall apron Web receiving section; 51 ... Belt conveyor; 52a ... Movable Roll a; 52b ... Movable roll b; 53a-d ... Fixed roll; 54 ... Web transport section;
55 ... Movable guide roll; 56 ... Holding roll; 61 ... Support roller; 62 ... Free end roller; 63 ... Receiving side belt conveyor; 64 ... Support roller; 65 ... Free end roller; 66 ...
Sending side belt conveyor; 71 ... Fixed roller a; 72 ... Fixed roller b; 73 ... Receiving side belt conveyor; 74 ... Support roller; 75 ... Free end roller; 76 ... Sending side belt conveyor

Claims (2)

[Claims] 1. A crosslay web comprising feeding a web fed from a card machine to a web transport means, and feeding the web from a web feed portion of the web transport means to a crosslay web transport portion of the web stacking transport means. In the manufacturing method, the web sending speed of sending the web from the card machine is periodically changed to periodically increase or decrease the basis weight of the web sent from the card machine. And an accumulating means is arranged between the web receiving portion of the web transporting means or in the middle of the web transporting means, and is correlated with a periodical change of the web sending speed from the card machine, As the web delivery speed increases cyclically, the web transport distance in the accumulating means is lengthened so that the web delivery speed from the card machine becomes cyclic. By changing the web transport distance in the accumulation means to be shorter as
The web feeding speed fed from the accumulating means is made substantially constant, the web feeding portion of the web conveying means is reciprocated at a substantially constant speed by the carriage means, and the web portion having a small basis weight is crossed. Corresponding the periodical change of the web feeding speed from the card machine and the reciprocating motion of the carriage means so that the web is laminated on both ends of the lay web, The web is supplied to the cross-lay web transfer section of the laminated transfer means at a substantially constant speed, and the transfer speed of the cross-lay web transfer section of the web stacked transfer means is set to a substantially constant speed. The method for manufacturing a crosslay web described above, characterized in that: 2. A card machine for sending a web; a web carrying means for receiving and carrying a web sent from the card machine; and a web carrying means for receiving and laminating a web from a web sending part of the web carrying means. Web stacking and conveying means; carriage means for reciprocally moving the web delivering portion of the web conveying means at a substantially constant speed; between the web delivering portion of the card machine and the web receiving portion of the web conveying means; Alternatively, a crosslay web manufacturing apparatus including an accumulating means arranged in the middle of the web transporting means; and a controlling means, wherein the controlling means periodically changes the web sending speed for sending the web from the card machine. By doing so, the basis weight of the web sent from the card machine is periodically increased or decreased, and the web sending speed from the card machine is periodically changed. Correlating with such changes, the web transport distance in the accumulating means is lengthened as the web delivery speed from the card machine periodically increases, and as the web delivery speed from the card machine periodically decreases. By changing the web transporting distance in the accumulating means to be short, the web feeding speed sent out from the accumulating means is made substantially constant, and the web portion having a small basis weight is laminated on both ends of the crosslay web. By correlating the periodical change of the web delivery speed from the machine and the reciprocating motion of the carriage means, the web is transferred from the web delivery part of the web transfer means to the cross-lay web transfer part of the web stacking transfer means. , Feeding at a substantially constant speed, and controlling the transfer speed of the cross-lay web transfer section of the web stacking transfer means. To constant speed manner, characterized in that, the cross lay web manufacturing apparatus.