JPS62250252A - Method for weaving base cloth of papermaking felt - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to a method for weaving a base cloth for papermaking felt, and particularly to a method for weaving a base cloth for papermaking felt, and in particular, a method for weaving a base cloth for papermaking felt, which is particularly easy to fabricate in a non-endless shape and then join into an endless shape on a papermaking machine. The present invention also relates to a method of weaving a felt base fabric with a small difference in characteristics between the joint portion and the base portion and with high uniformity.

[Conventional technology]

Traditionally, papermaking felt has been used in the form of an endless belt. Therefore, when feeding felt into a paper making machine, it is necessary to keep the rolls placed in the felt hanging in a cantilevered state, and the gap through which the felt is passed is quite small, and the Iffk of the felt is over 300 kg. Because there are so many items, it is extremely difficult to insert the hooks, and it is not uncommon for this task to take 4 to 5 hours, and as machines become larger, there is an urgent need to address this problem. Furthermore,
Damage to the surface of the felt has also become a problem due to difficult work being performed over a long period of time. On the other hand, from the perspective of the paper machine, it is necessary to design the paper machine to have considerably high mechanical strength in order to make it possible to cantilever the rolls.

[Problem that the invention attempts to solve]

In view of these circumstances, in recent years, we have created non-endless felt with joints on both ends of the felt, and after passing the felt in a non-endless form along the running route on the paper machine, we cut both ends of the felt. Some methods have been adopted to create an endless shape on papermaking machines by butt-jointing.However, when joining endlessly, the joint must have characteristics that are uniform with the non-jointed portion of the base. . Various methods have been devised to make felt into an endless shape on a paper making machine.
Normally, both loops are interlocked alternately and a common core wire is passed through both loops, but the distance to pass the core wire, that is, the length in the width direction of the paper making machine, may be more than 8 m, so it is difficult to insert small loops. Regularly joining over a long distance is difficult because the interlocking of the loops is incomplete or the linearity of the loops when passing the core wire is insufficient.

In order to make it easier to make the felt into an endless shape on a paper making machine and to reduce the difference in characteristics between the joined and non-joined parts, it is necessary to make the shape and size of the individual loops uniform, and to make the shape and size of each loop uniform. It is necessary to precisely match the loop spacing of each pair of interlocking loops to the loop spacing of the other, to ensure the linearity of the loop arrangement, to match the shape of the loops to the core wire shape, and to adjust the core wire. It is necessary to make the size of the loop as small as possible without causing any problem in passing it through.

In addition, if the joint part formed in an endless shape on the paper machine, that is, the joint part where both loops are interlocked and the core wire is passed through, and the non-joined part, that is, the base part, are not homogeneous, When used, differences occur in the compressive properties when the felt is pressed between rolls and the state of the capillaries formed by the fibers, making it impossible to drain the paper stock liquid evenly, resulting in a homogeneous product. It becomes impossible to make paper.

These problems can be solved by enlarging the loop, which improves the workability of joining on the paper machine, but the difference between the joined part and the non-joined part during use increases, and conversely, this difference If the loop is made smaller in an attempt to make it smaller, the workability during joining will be reduced, which is a contradictory relationship.

The present invention aims to solve the above-mentioned problems and to weave a base fabric for obtaining a felt that is homogeneous, with very little difference between the non-joined parts and the joined parts, and has good workability during joining. It is something.

[Means for solving problems]

A base fabric for papermaking felt that is woven into a bag shape, but by removing some of the warp yarns from the selvedges, it is turned into a non-circular shape, which is then hung on a papermaking machine and joined again into an endless shape on the papermaking machine. of! When fjllll, insert an intermediate plate between the upper and lower base fabric layers of both selvedges inside the bag-like base fabric, tension both selvedges from the inside to the side, and make sure that the weft fed from the shuttle is The threads advance toward the selvage threads alternately from the top and bottom of the board, the threads that have progressed from above the middle plate bypass the selvage threads and go upwards, and the threads that have progressed from below the middle plate move toward the same selvage thread. Detour around the thread and return downward to insert the weft.

[For production]

When weaving a bag-like base fabric, tension is applied to both sides of the bag-like base fabric from the inside toward both sides by the middle plate inserted into both sides of the bag-like base fabric. On the other hand, the weft yarns inserted into the warp openings are yarns that have come from above the middle plate and go around the ears and go upwards, and yarns that have come from below go around the ears and go downwards. Since the weft is inserted so that it returns, the rows of loops in the upper and lower layers of the base fabric receive tension from the middle plate when weaving in the same direction, so even after the end selvage yarn is pulled out, the rows of loops remain Significantly improves linearity.

〔Example〕

The felt base fabric woven by the method of the present invention is shown in FIG.
As shown in Figure 4, it is woven into a bag shape, but by removing some of the warp threads from the selvedge, it can be made into a non-circular shape, put into a paper making machine, and then joined again into an endless shape on the paper making machine. In order to do this, weft insertion must be carried out in such a way that the weft yarn inserted into the selvedge part is hooked onto the extraction yarn and then forms a loop and turns.

Furthermore, when joining the non-circular base fabric together in a circular shape, the loops at both ends of the base fabric must be accurately engaged with each other.

The weaving method will be described in detail below.

As shown in Figure 1, when making an endless shape on a paper making machine, by inserting the weft threads 7 between the warp threads 12 in the order abcd, so that the length direction on the paper making machine becomes the width direction on the loom. The base fabric 1 is woven into a flattened bag-like shape so that the butting position becomes one of the ears 2 on the am. During the above-mentioned weaving, both hem portions 2 of the base fabric 1 woven into a bag shape,
A middle plate 6.6a is inserted between the upper and lower base fabric layers 4, 5 in 2a, and both ear parts 2, 2a are tensioned laterally from the inside. Upper layer 4° and lower layer 5 of base fabric 1 made of weft threads 7 hooked to selvage threads 3
The loops 8 and 9 at each end of the loom are arranged so that the weft yarn 7 on the loom advances toward the selvage yarn 3 alternately from the upper and lower directions of the middle plate 6 in order to ensure the straightness of the loop arrangement 10.11. , the weft thread 7 that has proceeded from above the middle plate 6 bypasses the selvage thread 3 and goes upward, and the weft thread 7 that has progressed from below the middle plate 6 bypasses the same selvage thread 3 and returns below. In this way, 1i on the base fabric! 14 and the rows 10 and 11 of the loops 8 and 9 of the lower base layer 5 are each subjected to weft tension in the same direction during weaving. However, although not shown, even if the loops 8 of the upper layer 4 and the loops 9 of the lower layer 5 are not necessarily located alternately, if the number of each loop is approximately the same, then the loops 8 of the upper layer 4 or the loops 9 of the lower layer 4 will be a decimal number. It is okay to do it twice in a row.

By pulling out the weaving selvage yarn 3 after weaving, the bag-shaped base fabric upper layer 4 and the base fabric lower layer 5 are separated, and the acyclic base fabric 1 is completed.

Therefore, even after pulling out the selvage thread 3 and separating the loops 8 and 9, since the loops 8 and 9 were made by being locked to the selvage thread 3, the arrangement of the loops 8 and 9 is a straight line of 10° 11. This significantly improves performance. Before pulling out the selvage threads 3, mark the positions of the loops where they were interlocked with each other, and make it clear where the loops will interlock when they are turned into a non-endless shape and hung into a paper making machine, and when they are made into an endless state again. Good.

In the above example, the base fabric 1 woven into a bag shape is separated at only one edge to form a single non-circular base fabric (an example of the structure is shown in Fig. 3). As shown in FIG. 4, it is also possible to separate the bag-shaped base fabric 1 at both ear portions 2, 2a to form two non-circular base fabrics. In this case, in order to make it non-circular, the selvage thread 3a to be pulled out is provided on the selvage 2a at the opposite end of the selvage 2 of the flattened bag-shaped base fabric 1, and similar loops are made at both ends. It is also possible to weave with a structure that can form.

In this case, the base cloth kl14 and the base cloth lower lIi! A total of two base fabrics 1 and 1a, one for each of the base fabrics 15, are continuously woven. In order to make two sheets, each base fabric 1, 1a
When is made into an endless shape again on the paper making machine, the weft yarns 7 that have progressed from above the middle plate 6a are the selvage yarns, although there is a point that the interlocking partners at the time of weaving are not interlocked again. Weft yarn 7 bypassing 3a and proceeding upward and from below.
In the same way as in the previous example, a returns downward, and the linearity of the loop arrangement is maintained. Furthermore, when weaving a small base fabric with a large am, it is an advantageous method because two sheets are woven at the same time.

In addition, in order to adapt the loop shape to the core wire shape and to make the size of the loop small within a range that does not interfere with passing the core wire through, on the loom, the selvage threads 3 and 3a for forming the loops are attached to the warp threads of the ground part. 12. The diameter should be 1.5 to 2.5 times that of 12,
The thickness of the core wire when it is made into an endless shape again on a paper making machine is preferably 1.2 to 1.8 times the diameter, and within this range there will be no problem with strength during use.

Furthermore, the material of the selvage thread and core wire on ll1ll is polytetrafluoroethylene 2 whose surface is polytetrafluoroethylene in order to improve slippage, improve workability, and make it easier to maintain a constant loop shape. It is also possible to use a thread made of a material with a small coefficient of friction, such as a coated thread.

The properties of the loops are basically determined during weaving, but the shape of the loops can be made more stable by heat setting the base fabric after weaving.

In the manufacturing process of this felt, as shown in FIG. 6, the base fabrics 1, 1
A batt layer 13 is bonded onto a by needling,
Further, after a finishing process, while cutting the batt layer 13, the selvedge threads 3.3a during weaving are pulled out to make them non-endless.

Example 1 In the production of needle felt for making corrugated cardboard core paper, the warp on aS was used as the base fabric, that is, the thread for the ground part of the thread that becomes the width direction system when the final product is made. Diameter 0.6
Ichi's 6 nylon monofilament system was used, and for the selvage yarn of only one selvage part, which was pulled out after weaving, a yarn made by combining two 6 nylon monofilament systems with a diameter of 0.8IR1 was used. As the driving yarn, that is, the weft, we used two 6 nylon monofilament yarns with a diameter of 0.2 fins, which were further twisted together to form a 1/3
The fabric was woven based on a collapsed warp double weave, with an improved selvage structure, and a warp density of 60 yarns/inch and a weft yarn density of 32 yarns/inch.

The weaving width dimension of the base fabric was set to be the length in the circumferential direction when the final product was made. After weaving, heat setting is performed at a low temperature to stabilize the base fabric itself and the shape of the loop to make it endless, and then, using this as the base fabric, a batt layer is formed on both sides by needling. Combined. The raw material for the batt layer is 9 dtex 6 nylon for the surface layer.

Nylon 6 of 17 decitex was used for the surface layer, and the specifications were 500 g/TIt for the surface layer and 150 g/TIt for the back layer. After needling, heat setting was performed at a high temperature, and while cutting the batts of both the upper and lower layers in the width direction, one end of the batt was cut with 0,
Two strands of 8FM 6 nylon monofilament yarn were pulled out to form a non-endless shape.

When inserting non-endless felt into a papermaking machine, cut the previously used felt in the width direction, join the end of the new non-endless felt to the cut end, and slowly drive the felt. Pull it in, stop when the joined end reaches the first point after one round, butt the felt ends together, and while interlocking both loops, weave a 0.6 diameter 6, which is thinner than the diameter of the selvedge thread during weaving. It was made into an endless shape by passing nylon monofilament through it.

Example 2 In the production of needle felt for making corrugated board liners, 0.75fl 66 nylon monofilament yarn was used on the left and right sides as the warp on the RR as a base fabric, that is, the yarn in the ground portion that becomes the width direction yarn of the final product. Using four strands of 0.7n polyester monofilament yarn for the ears on both ends,
On the other hand, as the weft on the loom, a 6 nylon monofilament yarn with a diameter of 0.2M and a 6 nylon multifilament yarn with a diameter of 840 denier are twisted together, and 3 more strands are used as the weft, and 1/3 warp double weave is used. The warp density is 72 threads/inch based on the selvedge tissue.

The weft density was 28 threads/inch. @ After weaving, the batt layer was bonded by needling without heat setting at low temperature, and after heat setting, 0, 7 was used as the yarn at both ends during weaving.
Four pieces of dark polyester monofilament yarn were pulled out to obtain two non-endless felts each having loops at both ends. 0 for the core yarn when making it into an endless shape on a paper making machine
．． A 65 tm 66 nylon monofilament yarn was used in the paper-made product without any difference between the joint and the base.

(Effects of the Invention) In the process of forming an endless paper on a paper making machine, the shape and size of the loops are uniform, and the linearity of the arrangement of the loops is excellent, so that the interlocking of opposing loops is easy. This produced the effect that the alignment was good and the core wire was easy to pass through. Therefore, the ease of work means that no excessive force is applied to the loops and core wires, resulting in a uniform seam that does not cause distortion, and there is no difference in the characteristics between the joint part and the ground part. It was noticeably smaller.

Length 35m, lff18m,! ftm 320Kg
(1)) In the case of
Conventionally, it took 4 to 5 hours for endless felt, but this was shortened to about 1 hour for felt using the base fabric according to the loop forming method of the present invention.

Furthermore, since the difference between the joint part and the ground part was extremely small, paper making using this felt was completely homogeneous as in the case of using endless felt.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of the base fabric ¥J fiber woven according to the method of the present invention. Figure 2 is a perspective view of the selvage yarn and upper and lower layer loops that make up the selvage part;
Fig. 3 is an organization chart, Fig. 4 is a cross-sectional view of another example when weaving the base fabric, Fig. 5 is a cross-sectional view of felt, and Fig. 6 shows a state in which a part of an ann with a middle plate attached is removed. Schematic diagram. 1.1a...Base fabric, 2,2a...Ear portion, 3.3
a...Selvage yarn, 4...Base fabric upper layer, 5...Base fabric lower layer, 6, 6a...Middle plate, 7...Weft yarn,
8... Upper layer loop, 9... Lower layer loop, 1
0.11 Loop arrangement, 12... warp, 1
3...Bat layer patent Applicant: Nippon Felt Co., Ltd., patent attorney Katsu Ohno, Reiko Ohno
Above Ryunosuke Ohno Figure 4 Figure 3 Figure 5 Figure 6

Claims (1)

[Claims] When weaving a base fabric that is made into a non-endless shape by weaving it into a bag shape and pulling out the warp yarns at the selvedges, an intermediate plate is placed between the upper and lower base fabric layers in both selvedges of the bag-shaped base fabric. The weft yarn fed from the shuttle during weaving advances from the top and bottom of the middle plate toward the selvage yarn, and the yarn that has come from above the middle plate bypasses the selvage thread and moves upwards,
A method for weaving felt base fabric for papermaking, characterized in that the threads coming from below the middle plate bypass the same selvage threads and are inserted so as to return downwards.