JP4950766B2 - Felt with seam for papermaking - Google Patents

Description

  The present invention provides a papermaking having a base fabric in which a loop for joining an end is formed at a folded portion of two warp yarns, and an additional weft made of a yarn material different from a ground weft is woven in the vicinity of the loop. For felts with seams.

  In order to improve the workability into the paper machine, a so-called seam felt in which end felts are drawn into a felt run and both ends thereof are joined to each other to be endless is widely used. In this type of seamed felt, loops formed at the end in the length direction by folding back the warp constituting the base fabric are alternately meshed so that their center holes are aligned with each other, thereby forming a common hole formed thereby. The structure which joins both ends through a core wire is common.

Such a felt with a seam has a seam portion, and various problems that do not occur with an endless felt, such as a seam mark on a product due to structural differences between the seam portion and the ground portion, Or the problem that the non-woven fiber layer falls off at the seam part occurs, and the problem that the workability at the time of end joining deteriorates due to the deformation of the loop occurs. On the other hand, various techniques are known in which a yarn different from the ground portion is separately added in the vicinity of the loop to cope with it (for example, see Patent Documents 1 to 15).
Japanese Utility Model Publication No. 56-6479 Japanese Utility Model Publication No. 55-47920 JP 02-68389 A Japanese Patent No. 3027415 Japanese Patent No. 3629276 Special Table 2002-52365 JP 2002-523653 A Special table 2003-504533 gazette JP 2002-294579 A Japanese Patent No. 3767585 JP 2003-239194 A JP 2003-247191 A JP 2002-294579 A JP 2004-232142 A JP 2004-285554 A

  However, in the conventional felt with a seam, since there is nothing equivalent to a weft on both sides of the core wire insertion portion in the seam portion, there are more voids than other portions, and it becomes a recess that is difficult to apply pressure when pressed by a press roll. Therefore, by arranging additional wefts so as to fill the gap in this part, the pressure at the time of pressurization is made uniform, and paper breakage and seam marks due to poor dehydration are suppressed, and the water permeability of the seam part is changed to the ground part. However, if the additional weft is too thick, it becomes a convex part that increases in pressure when pressed, which causes seam marks and vibration, and also adversely affects the loop form.

  Moreover, in the conventional felt with a seam, a thread material that is flattened at an intersecting portion that contacts the warp is used for the additional weft to prevent twisting of the loop, but the additional weft is too flattened. As a result, the effect of filling the gap in the seam portion is reduced, and the effect of suppressing the seam mark cannot be obtained. Furthermore, by adopting a thread that has good entanglement with the fibers forming the nonwoven fiber layer as the additional weft, the flap protruding from one end so as to cover the non-woven fiber layer, particularly the paper-making side of the loop, is removed. However, if the additional weft is too flat, the ability to hold the flap is lowered, and the effect of preventing the flap from falling off cannot be obtained sufficiently.

  The present invention has been devised to solve such problems of the prior art, and its main purpose is a convex portion in which the portion where the additional weft is woven makes the pressure during pressurization uneven. A felt with a seam for papermaking, which is configured to prevent problems such as seam marks, prevent loops from twisting, and prevent flaps from falling off. It is to provide.

In order to solve such a problem, in the present invention, as shown in claim 1 , a loop for joining the end portions is formed at the folded portion of the two warp yarns, and the weft of the ground is formed at the base portion of the loop. In the felt with a seam for papermaking having a base fabric in which an additional weft made of a different thread material is woven, the additional weft is a twisted yarn in which two yarn materials are twisted together and has a length corresponding to a half rotation of the twist However, the number of twists was set so as to be approximately equal to the arrangement interval of the loops arranged in the width direction.

  According to this, two yarn materials constituting the additional weft are arranged in the transverse direction along the warp at the intersecting portion that contacts the warp forming the loop, and the additional weft is flattened as a whole. For this reason, it is possible to avoid problems such as seam marks, vibration, and twisting of the loop that occur when the portion in which the additional weft is woven becomes a convex portion. In addition, the additional wefts support the base portion of the loop in a wide range, and the twist of the loop can be suppressed.

In this case , the additional weft may be a monofilament yarn and a multifilament yarn, a monofilament yarn and a spun yarn, and a multifilament yarn and a spun yarn. Is possible.

  In addition, the multifilament yarn may be a twisted yarn obtained by twisting a plurality of filaments in addition to a draw yarn without warp.

  As described above, according to the present invention, the additional weft appropriately fills the gap in the seam portion, and the portion where the additional weft is woven does not become a convex portion or a concave portion that makes the pressure during pressurization uneven. , Paper breaks, seam marks, vibrations, and twisting of the loop can be avoided, and the water permeability of the seam can be made the same as that of the ground, and the additional weft forms a loop. Appropriately flattening along the warp, the additional weft supports the base of the loop in a wide range, and the twist of the loop can be suppressed. Furthermore, since the additional weft is not excessively flattened, the entanglement of the non-woven fiber layer forming fiber with respect to the additional weft becomes good, and the flap can be prevented from falling off.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view in the length direction showing an example of a felt with a seam according to the present invention. This felt with seam is formed by laminating a non-woven fiber layer 2 on a base fabric 1, and the base fabric 1 is a double woven fabric in which wefts 5 are entangled with a pair of warps 3 and 4. Loops 11 for joining the end portions are formed at both ends 8 and 9 in the length direction by folding the yarns to be warp yarns 3 and 4, respectively, and are alternately meshed so that the center holes thereof are aligned. The both ends 8 and 9 are joined by inserting the joining core wire 13 in the width direction into the common hole formed in this way.

  The warp yarns 3 and 4 are monofilament yarns made of a high-strength synthetic resin material such as polyamide. Similarly, the weft yarns 5 are monofilament yarns made of a synthetic resin material having high strength and relatively high rigidity such as polyamide. .

  An additional weft 15 made of a yarn material different from the ground weft 5 is provided at the base of the loop 11, that is, the portion between the tip of the loop 11 through which the joining core wire 13 is inserted and the weft 5 at the end of the ground. Is provided. Here, the additional weft 15 is woven in a single weave so as to be individually entangled with each of the two warps 3 and 4 forming the loop 11. It is possible to weave the additional wefts 15 by double weaving so that both the warp yarns 3 and 4 are entangled with each other so that the warp yarns 3 and 4 are connected to each other. When weaving with a weave, the base portion of the loop 11 is not restrained, which is effective in suppressing the twist of the loop 11.

  As will be described in detail later, the additional weft 15 is formed of a twisted yarn of a monofilament yarn made of one filament and a multifilament yarn obtained by collecting a plurality of small-diameter filaments, and intersects with the warp yarns 3 and 4. In the portion, it spreads in the lateral direction along the warps 3 and 4 and is flattened.

  The upper side of the loop 11 (on the papermaking surface 17 side) has a form in which the non-woven fiber layer 2 on the end 8 side located on the front side in the running direction is protruded toward the end 9 while being put in the paper machine. Covered with a flap 19.

  FIG. 2 is a schematic diagram showing a manufacturing procedure of the additional weft 15 shown in FIG. The additional weft 15 is a twisted yarn composed of a monofilament yarn 21 made of a single filament and a multifilament yarn 22 in which a plurality of filaments having a smaller diameter are gathered. The monofilament yarn 21 and the multifilament yarn 22 are separated from each other. The additional wefts 15 are manufactured by twisting one by one to form the twisted yarns 23, and further twisting the two twisted yarns 23 together. Here, twisting is performed twice, and the additional weft 15 is a double twisted yarn. In addition, in the manufacturing process of the additional weft 15, heat setting is appropriately performed in order to stabilize the twisted state.

  Here, the direction of the upper twist in which the two twisted yarns 23 are twisted may be opposite to the direction of the lower twist in which the monofilament yarn 21 and the multifilament yarn 22 are twisted, thereby canceling the twisting torque. The warp yarns 3 and 4 forming the loop 11 are stably held by the additional weft yarn 15.

  FIG. 3 is a cross-sectional view in the width direction when the base fabric 1 shown in FIG. 1 is viewed from the loop 11 side. FIG. 4 is a top view of the base fabric 1 shown in FIG. 1 viewed from the papermaking surface 17 side.

  The additional weft 15 has a length corresponding to a half rotation of the twist, that is, a half L / 2 of a length corresponding to one twist (twist pitch) L / 2, which roughly matches the arrangement interval of the loops 11 arranged in the width direction. Thus, the number of twists is set. Thus, each time the two twisted yarns 23 constituting the additional weft yarn 15 are rotated 180 degrees and the positions thereof are switched, the additional weft yarn 15 is brought into contact with the warp yarns 3 and 4 forming the loops 11 arranged in the width direction. Thus, at the intersection where the warp yarns 3 and 4 are in contact with each other, the two twisted yarns 23 are always arranged in the lateral direction along the warp yarns 3 and 4, and the additional weft yarn 15 is flattened as a whole. For this reason, the additional weft 15 comes to support the base of the loop 11 in a wide range, and the twist of the loop 11 can be suppressed.

  Further, the additional weft 15 is flattened by spreading each filament of the multifilament yarn 22 constituting the twisted yarn 23 laterally along the warp yarns 3 and 4 at the intersecting portion where the warp yarns 3 and 4 come into contact. If the twist of the lower twist that twists the monofilament yarn 21 and the multifilament yarn 22 is too strong, the flat twist is not sufficiently flattened. Therefore, the twist of the lower twist may be weakened. It is preferable to make it smaller, that is, twist the lower twist more weakly than the upper twist.

  Further, the number of twists (strength of twist) of the upper twist and the lower twist is preferably 2 to 7 (times / 2.54 cm). In particular, when the number of twists of the upper twist (strength of twist) is 2 to 7 (times / 2.54 cm), as shown in FIGS. 3 and 4, the length L / 2 corresponding to half rotation of the twist is It is possible to substantially match the arrangement interval of the loops 11 arranged in the width direction.

  FIG. 5 is a schematic diagram showing the outline of the weaving of the base fabric 1 shown in FIG. Here, the first and second warps 3 and 4 on the paper machine are woven as driven yarns on the loom, and the wefts 5 and 15 on the paper machine are warps (warp threads) on the loom, forming a loop. The base fabric 1 is woven endlessly by bag weaving while forming the loop 11 by entwining the driving thread around the core material 51. Specifically, the loop 11 is formed on one of the ears 52 and 53 on the loom, and the thread to be warped 3 and 4 is hooked on the loop forming core member 51 and folded at the one ear 52. After the loop 11 is formed and the base fabric 1 is woven in an endless manner in this way, the loop forming core material 51 is pulled out from the loop 11 and is expanded into an end shape.

  In one ear 52, a warp yarn composed of a monofilament yarn and a multifilament yarn serving as an additional weft yarn 15 is disposed, and in other regions, a warp yarn composed of a monofilament yarn serving as a base weft 5 is disposed. The base fabric 1 in which the additional wefts 15 are arranged in the vicinity of the loop 11 is woven by passing the driving yarns to be the warp yarns 3 and 4 as indicated by arrows. At this time, the warp yarn as the additional weft yarn 15 is passed through the warp yarn which can be driven independently of the warp yarn through which the warp yarn as the ground weft yarn 5 is passed. Wefts 15 can be woven.

  FIG. 6 is a schematic diagram showing another example of the additional weft according to the present invention. Here, another example in the case of using two monofilament yarns as in the example of FIG. 2 is shown.

  In the example of FIG. 6A, the additional weft yarn 61 is made of a twisted yarn of only monofilament yarn, and the additional weft yarn 61 is manufactured by twisting the two monofilament yarns 21 together. In the example of FIG. 6 (B), the additional weft yarn 62 is composed of a twisted yarn of a monofilament yarn 21 and a multifilament yarn 22, and two monofilament yarns 21 and one multifilament yarn 22 are twisted together. An additional weft 62 is produced.

  When two monofilament yarns 21 are used in this way, as shown in FIG. 12, monofilament yarns 21 having a yarn diameter of 0.15 mm to 0.27 mm are used, and multifilament yarns 22 have a yarn diameter of 500 d to It is preferable to use the one of 1300d.

  FIG. 7 is a schematic view showing another example of the additional weft in the present invention, and shows an example in which three monofilament yarns are used.

  In the example of FIG. 7A, the additional weft 71 is composed of a twisted yarn of only the monofilament yarn 21, and the additional weft 71 is manufactured by twisting the three monofilament yarns 21 at a time. In the example of FIG. 7B, the additional weft yarn 72 is made of a twisted yarn of the monofilament yarn 21 and the multifilament yarn 22, and the three monofilament yarns 21 and one multifilament yarn 22 are twisted at a time. In addition, an additional weft 72 is manufactured.

  In the example of FIG. 7C, the additional weft 73 is made of a twisted yarn of the monofilament yarn 21 and the multifilament yarn 22. Here, three multifilament yarns 22 are used, and the monofilament yarn 21 and The multifilament yarn 22 is twisted one by one to form a twisted yarn 74, and the three twisted yarns 74 are further twisted to produce an additional weft 73. Here, twisting is performed twice, and the additional weft 73 is a double twisted yarn.

  When three monofilament yarns 21 are used in this way, as shown in FIG. 12, monofilament yarns 21 having a yarn diameter of 0.11 mm to 0.23 mm are used, and multifilament yarns 22 are used with a yarn diameter of 300 d to It is good to use the thing of 1000d.

  8 and 9 are schematic views showing another example of the additional weft in the present invention. Here, an example in which four monofilament yarns are used is shown.

  In the example of FIG. 8 (A), the additional weft yarn 81 is made of a twisted yarn of only the monofilament yarn 21, and the two monofilament yarns 21 are twisted to form a twisted yarn 82, and two twisted yarns 82 are twisted together. An additional weft 81 is produced. Here, twisting is performed twice, and the additional weft 81 is a double twisted yarn.

  In the example of FIG. 8B, the additional weft 83 is made of a twisted yarn of the monofilament yarn 21 and the multifilament yarn 22, and the two monofilament yarns 21 and one multifilament yarn 22 are twisted together. An additional weft 83 is manufactured by twisting two twisted yarns 84 into a twisted yarn 84. Here, twisting is performed twice, and the additional weft 83 is a double twisted yarn.

  In the example of FIG. 9, the additional weft yarn 91 is made of a twisted yarn of a monofilament yarn 21 and a multifilament yarn 22. First, the monofilament yarn 21 and the multifilament yarn 22 are twisted one by one to form a twisted yarn 92. Next, two twisted yarns 92 are twisted to form a twisted yarn 93, and two twisted yarns 93 are further twisted to produce an additional weft 91. Here, twisting is performed three times, and the additional weft 91 is a triple twisted twisted yarn.

  When four monofilament yarns 21 are used in this way, as shown in FIG. 12, monofilament yarns 21 having a yarn diameter of 0.08 mm to 0.15 mm are used, and multifilament yarns 22 have a yarn diameter of 100d to 100d. It is good to use the thing of 700d.

  FIG. 10 is a schematic view showing another example of the additional weft in the present invention. Here, the additional weft yarn 101 is made of a twisted yarn of a monofilament yarn 21 made of one filament and a spun yarn 102 obtained by spinning a staple having a smaller diameter, and the monofilament yarn 21 and the spun yarn 102 are combined. The additional wefts 101 are manufactured by twisting each one to form the twisted yarn 103 and further twisting the two twisted yarns 103.

  When the additional weft is made of a twisted yarn of the monofilament yarn 21 and the spun yarn 102 as described above, in addition to the example of FIG. 10, various configurations are possible as in the examples shown in FIGS. 6 to 9. In this case, the multifilament yarn 22 shown in FIGS. 6 to 9 may be replaced with the spun yarn 102.

  As for the thicknesses of the monofilament yarn 21 and the spun yarn 102, yarns having a diameter as shown in FIG. 12 may be used as in the above example.

  FIG. 11 is a schematic diagram showing another example of the additional weft in the present invention. Here, the additional weft yarn 111 is made of a twisted yarn of a multifilament yarn 22 in which a plurality of filaments are aggregated and a spun yarn 102 obtained by spinning staples, and each of the multifilament yarn 22 and the spun yarn 102 is 1 The additional wefts 111 are manufactured by twisting them one by one to form the twisted yarn 112, and further twisting the two twisted yarns 112.

  When the additional weft is made of a twisted yarn of the multifilament yarn 22 and the spun yarn 102 as described above, in addition to the example of FIG. The monofilament yarn 21 shown in FIGS. 6 to 9 may be replaced with the spun yarn 102 in this case.

  As for the thicknesses of the multifilament yarn 22 and the spun yarn 102, those having substantially the same yarn diameter may be used as shown in FIG.

  In addition, although the example of the additional weft was shown in FIG.2 and FIGS. 6-11, the additional weft by this invention is not limited to these examples, It is possible to use the twisted yarn by various twisting methods It is.

  In addition, in the example shown in FIGS. 6 to 11, when the additional weft is a double twisted or triple twisted twisted yarn, the direction of the upper twist is the same as the direction of the lower twist as in the example of FIG. It is better to reverse. Moreover, it is preferable to twist the lower twist more weakly than the upper twist. Further, the number of twists (strength of twist) of the upper twist and the lower twist is not particularly limited, but may be 2 to 7 (times / 2.54 cm). In addition, in the production process of the additional weft, heat setting is appropriately performed in order to stabilize the twisted state.

  In addition, in each case where the additional weft is a monofilament yarn-only twist yarn, a monofilament yarn and a multifilament yarn twist yarn, a monofilament yarn and a spun yarn twist, and a multifilament yarn and a spun yarn twist, FIG. ), FIGS. 8 (A) and 8 (B), and FIGS. 9 to 11, the additional weft yarn is a twisted yarn (twist yarn) obtained by twisting two yarn materials together, as shown in FIGS. 3 and 4. As shown in (1), the number of twists can be set such that the length L / 2 corresponding to the half rotation of the twist substantially matches the arrangement interval of the loops arranged in the width direction.

  FIG. 13 shows the pressure distribution state of the seam portion in the embodiment according to the present invention shown in FIG. 1 and the comparative example according to the prior art. Here, a pressure measurement film (prescale) whose color density changes according to the pressure is used, and this pressure measurement film is layered on the felt according to the example and the comparative example under a pressure condition of 78.45 kN / m. Pressurized by a press roll.

  In the embodiment shown in FIG. 13 (A), two additional yarns made by twisting a monofilament yarn and a multifilament yarn one by one as shown in FIG. A twisted product was used. Here, monofilament yarns having a thickness of 0.21 mm and multifilament yarns each having 140 filaments having a thickness of 6d bundled were used.

  In the comparative example shown in FIG. 13B, a multifilament yarn (a non-warped draw yarn) was used as the additional weft. Here, as the multifilament yarn, 175 filaments having a thickness of 6d were aligned.

  In the comparative example shown in FIG. 13B, areas with low color density appear on both sides of the core wire insertion portion, indicating that the pressure is low here. On the other hand, in the example shown in FIG. 13A, there is almost no low pressure portion as in the comparative example, and the pressure distribution is almost uniform, confirming the effectiveness of the present invention.

  The felt with a seam for papermaking according to the present invention avoids a problem such as a seam mark so that a portion woven with additional wefts does not become a convex portion or a concave portion that makes the pressure during pressurization uneven. In addition, it has the effect of suppressing the twist of the loop and preventing the flap from falling off, and a loop for joining the end portion is formed at the folded portion of the two warps, and in the vicinity of the loop. It is useful as a felt with a seam for papermaking having a base fabric in which an additional weft made of a yarn material different from the ground weft is woven, particularly a press felt used in a press part of a paper machine.

It is sectional drawing of the length direction which shows an example of the felt with a seam by this invention. It is a schematic diagram which shows the manufacture procedure of the additional weft shown in FIG. It is sectional drawing of the width direction which looked at the base fabric shown in FIG. 1 from the loop side. It is the top view which looked at the base fabric shown in FIG. 1 from the papermaking surface side. It is a schematic diagram which shows the point of the weaving of the base fabric shown in FIG. It is a schematic diagram which shows another example of the additional weft in this invention. It is a schematic diagram which shows another example of the additional weft in this invention. It is a schematic diagram which shows another example of the additional weft in this invention. It is a schematic diagram which shows another example of the additional weft in this invention. It is a schematic diagram which shows another example of the additional weft in this invention. It is a schematic diagram which shows another example of the additional weft in this invention. It is a figure which shows the example of the yarn diameter of the monofilament yarn, multifilament yarn, and spun yarn in the example shown in FIGS. It is a figure which shows the distribution state of the pressure of the seam part in the Example by this invention shown in FIG. 1, and the comparative example by a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base fabric 2 Non-woven fiber layer 3/4 Warp 5 Weft 11 Loop 15, 61, 62, 71, 72, 73, 81, 83, 91, 101, 111 Additional weft 19 Flap 21 Monofilament yarn 22 Multifilament yarn 102 Spinning yarn

Claims (5)

A felt with a seam for papermaking having a base fabric in which a loop for end joining is formed at the folded portion of two warp yarns, and a base fabric in which an additional weft made of a different thread material from the ground weft is woven is formed at the base of the loop Because
The additional weft is a twisted yarn obtained by twisting two yarn materials, and the number of twists is set so that the length corresponding to the half rotation of the twist substantially matches the arrangement interval of the loops arranged in the width direction. Featuring a seam felt for papermaking.   The felt with a seam for papermaking according to claim 1, wherein the additional weft is a twisted yarn of only a monofilament yarn made of one filament.   The felt with a papermaking seam according to claim 1, wherein the additional weft yarn is a twisted yarn of a monofilament yarn made of one filament and a multifilament yarn in which a plurality of filaments having a smaller diameter are gathered.   The felt with a seam for papermaking according to claim 1, wherein the additional weft yarn is a twisted yarn of a monofilament yarn made of one filament and a spun yarn obtained by spinning a staple having a smaller diameter.   The felt with a seam for papermaking according to claim 1, wherein the additional weft yarn is a twisted yarn of a multifilament yarn obtained by collecting a plurality of filaments and a spun yarn obtained by spinning staples.