JP2010065343A - Felt with seam for paper manufacture - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a seam felt for paper manufacture, having seam loops intermeshed with one another so that the felt is preferably installed. <P>SOLUTION: The felt F for a papermaking machine has seam loops formed at opposite ends in the MD direction of a ground fabric having two ends, and to the ground fabric layers of batt fiber are integrated by needle punching. A group of seam loops is composed of a plurality of seam loops arranged in side by side relationship, and a seam core line member is inserted into a common bore formed by the meshing of the seam loops to connect the ends in the MD direction of the seam felt together. The seam loops of each group can be integrated by adhesive bonding, heat adhesion of core-in-sheath composite fibers, or the like. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a felt used in a press part of a papermaking machine, and more particularly, to a felt with a seam for papermaking having a seam loop (hereinafter sometimes simply referred to as “seam felt”).

Conventionally, in a press part of a papermaking process, wet paper is squeezed by a needle felt and a pair of press rolls.
As this felt, an end piece having a seam loop shown in FIG. 1 is known. The felt F is formed in an end shape, and a plurality of loops L are formed at each end.
For example, as shown in FIG. 2, the felt F includes a base fabric B and two bat fiber layers W formed on the front and back sides thereof. The batt layer W is formed by entanglement and integration of web fibers laminated on the base fabric B with a needle punch.
The base fabric B is configured by weaving a thread material in the MD direction and a thread material in the CD direction. And the loop L for seam is comprised with the thread material of MD direction.

At the time of use, the end felt F is put into a paper machine, both ends are butted together, and the loops at both ends are fitted between the loops at one end, and the loops at both ends are fitted together. Engage one by one alternately.
In this engagement operation, the loops are not directly attached to each other from the front, but the both ends are attached in a mountain shape as shown in FIG. Therefore, when the other loop is fitted between the one loops, the other loop is fitted between the one loops from the lower side to the upper side.
In the meshing operation, a dedicated jig may be used, but details thereof are omitted.

When the meshing operation is finished, as shown in FIG. 2B, a common hole is formed by meshing, and the core wire S is inserted into the common hole. And the endless papermaking felt F is formed by making the edge part attached to the mountain shape into a planar shape.
Such a felt F is called a “seam felt”, and has been in an increasing trend in recent years because it is very easy to put in (see Patent Document 1).

  The felt-like felt F has a width in the CD direction, a length in the MD direction, and front and back surfaces (both surfaces). When the felt F is changed from endless to endless, both surfaces constitute an outer peripheral surface and an inner peripheral surface. In this case, the outer peripheral surface is a surface in contact with the wet paper, and the inner peripheral surface is a surface in contact with the press roll.

  Next, the structure of the base fabric B will be described with reference to FIG. FIG. 3 is a schematic view of one end of the end-like base fabric. Here, the MD direction yarn material is folded at the end portion to form a pair of upper and lower structures. FIG. 3 is a perspective view of a known double woven base fabric B. FIG.

  The base fabric B is composed of MD direction thread materials 11A to 14B and CD direction thread materials 21 to 24. In the thread group 11A to 14B in the MD direction, the thread materials 11A and 11B, 12A and 12B, 13A and 13B, and 14A and 14B are continuous, respectively. An end seam loop L is formed.

In this way, after forming the base fabric B and heat-setting in the next step to stabilize the shape of the seam loop, the bat fiber layer is further entangled and integrated in the needle punching step to complete the felt shape. FIG. 4 shows the result (see Patent Document 2).
In FIG. 4, when the seam loops are engaged with each other, one of the seam loops is made to appear a little black so that it can be easily confirmed that the seam loops are engaged alternately.

  The seam felt thus completed is pulled out of the core wire S, removed from the seam loop and made into an end shape, and then packed. And when hanging on the papermaking machine, after removing the roll and the support member of the roll, after stopping the machine, to the seam felt to be newly hung, through the seam felt induction band attached in advance, The used seam felt is connected and pulled into the machine (see Patent Document 3).

After that, both ends of the seam felt that has been put in contact with each other, and the core wire S is inserted into the space formed by alternately meshing the seam loops L. Sometimes it would hang. For example, when the seam loop is slanted or the loop is drawn in the root direction and the inner diameter of the loop is reduced, and the space that can be meshed is not uniform, the insertion of the core wire may be worsened. was there.
Further, the operation of alternately meshing the seam loops L is complicated, and the smaller the fineness (thickness) of the MD direction thread material, the more difficult and long the operation may be.
JP 2004-232142 A US Pat. No. 4,938,269 JP-A-8-284092

  Accordingly, an object of the present invention is to provide a seam felt for papermaking which can solve the above-mentioned problems and can satisfactorily perform a felt putting operation for meshing a seam loop.

  The present inventor has conducted intensive research to solve the above problems, and in a seam felt base fabric, two or more MD direction yarn materials forming a seam loop are aligned to form a set of seam loop groups. As a result of finding out that the above-mentioned problems can be solved and further researching, the present invention has been completed.

That is, the present invention
A felt for a papermaking machine having seam loops at both ends in the MD direction of an end-like base fabric, wherein a bat fiber layer is entangled and integrated with the base fabric by a needle punch,
A plurality of seam loops are aligned to form a set of seam loop groups, and seam core wires are inserted into common holes formed by alternately engaging the seam loop groups with both ends in the MD direction. A felt with a seam for papermaking.

  In the present invention, the seam loop group is preferably formed by two or three seam loops. The seam loop group of the present invention is preferably formed so that the seam loops are close to each other, and the seam loop interval is preferably a fiber diameter of the MD direction yarn material or an interval narrower than that. More preferably, the seam loops are formed so as to be close to each other.

  Furthermore, in the present invention, it is a preferred embodiment that the seam loops forming the seam loop group are integrated by bonding with an adhesive.

  In the present invention, the MD direction yarn material forming the seam loop group is a core-sheath composite fiber yarn comprising a sheath portion containing a low melting point component and a core portion containing a high melting point component, and the MD direction yarn It is also a preferred embodiment that the material forms the seam loop group at both ends in the MD direction, and the seam loop group is integrated by thermal bonding.

In the seam felt base fabric of the present invention, a set of seam loops are formed by aligning a plurality of seam loops. Therefore, even if the MD direction yarn material forming the seam loops is thin, seam ( The seam loops can be stably meshed when connecting).
Further, in the present invention, since the seam loops forming the seam loop group are joined and integrated, the seam loop group is not easily displaced in either the outer direction or the CD direction, and is stably disposed at a predetermined position. Since the shape of the loop is maintained, the seam loop meshing operation can be performed satisfactorily.

Hereinafter, the felt with a seam for papermaking of the present invention will be described in detail.
Here, embodiments of the present invention will be described using specific examples based on the drawings. However, these are specific examples, and the present invention is not limited thereto.

  FIG. 5 is a perspective view of one end of the double woven base fabric BA of the present invention. The base fabric BA is configured by weaving with the MD direction thread material 50 and the CD direction thread material 60. And MD direction thread material 50 is turned up in the end and constitutes seam loop group LA. In FIG. 5, the seam loop group shows the best state in which the seam loops are substantially in contact with each other, but the seam loops may be arranged at a fiber diameter of the MD-direction yarn material 50 or at an interval narrower than that. .

  The MD direction yarn material 50 is supplied to the loom by aligning a plurality of monofilaments (single yarn). In FIG. 5, the seam loop forms one seam loop group by a set of two monofilaments. In the present invention, the seam loop is preferably characterized in that one seam loop group is formed by one set of two or three sets. When one set is formed by four or more sets, one end is formed. Since the interval between the seam loop groups in the portion (the interval between LA1 and LA2) increases, the strength of the entire seam portion may decrease.

  As the CD direction yarn material 60, a monofilament can be used as a single yarn or a twisted yarn. When multifilament or spun yarn is used for the CD direction thread material 60a in the vicinity of the core S, the entanglement between the bat fiber and the CD direction thread material 60a can be strengthened when the bat fiber layer is entangled and integrated with the outer peripheral surface. preferable.

  After configuring the base fabric BA, heat setting is performed in the next step in order to stabilize the shape of the seam loop by the same method as before, and the bat fiber layer is entangled and integrated in the needle punching step to Finalize. Then, the core wire of the completed felt is pulled out, the seam loop is disengaged to form an end, and then packed. Then, the method of hanging into the papermaking machine is the same as the conventional method, that is, the core S is inserted into the space (common hole) formed by butting both ends of the loaded seam felt and alternately meshing the seam loop groups at both ends. It will be completed.

  The MD direction yarn material of the present invention is obtained by joining and integrating seam loops with an adhesive, or a core-sheath composite fiber consisting of a sheath portion containing a low melting point component and a core portion containing a high melting point component. It is preferable to use and integrate the seam loops by thermal bonding. Such joining between the seam loops or thermal joining can be performed in a heat setting process for stabilizing the loop form.

  In the present invention, by joining and integrating the seam loops, the seam loop group is not easily displaced in either the outer direction or the CD direction, and is stably disposed at a predetermined position, and the shape of the loop is maintained. Therefore, the seam loop can be easily engaged after the felt has been put on the papermaking machine. In particular, the seam felt of the present invention does not incline the seam loop or pull the loop in the root direction, and the space that can be meshed is uniform and the core wire can be inserted very easily.

  Examples of the felt with a seam for papermaking of the present invention will be described below, but these do not limit the present invention.

In the embodiment of the present invention, MD direction thread material and CD direction thread material were prepared. The detailed configuration of the yarn material is as follows.
・ Thread material A. ・ Nylon 6 monofilament (single yarn). Fineness 1000dtex (fiber diameter 0.33mm)
-Thread material B-Nylon 6 monofilament (single yarn). Fineness 500dtex (fiber diameter 0.23mm)
Thread material C: A monofilament (single yarn) of a core-sheath type composite fiber having a nylon 6 component (high melting point: 250 ° C.) as a core and a copolymer nylon component as a sheath (low melting point: 180 ° C.). Fineness 1000 dtex (fiber diameter 0.32mm)

Example 1
The base material BA1 was obtained by weaving 3/1 1/3 warp with the thread material A as the MD direction thread material and the thread material B as the CD direction thread material. FIG. 6 shows a cross-sectional view in the CD direction. Since the MD direction yarn material is woven by aligning two yarns and supplying them to the loom, the seam loop forms a group of two seam loops.
The base fabric BA1 is formed in an endless shape as shown in FIG. 7 by folding back the MD direction yarn material at the core line S supplied on the loom.
FIG. 7 shows that the seam loop groups LA1, LA2,... Constituted by one end of the end-like base fabric BA1 and the seam loop groups LB1, LB2,. It is a perspective view in the state where it was constituted endlessly via core wire S.
Next, the base fabric BA1 is removed from the loom, placed between a pair of rolls, and the base fabric BA1 is heat-set using a roll and / or a heating device (not shown) installed between the rolls. The seam loop groups LA and LB are stabilized. Thereafter, a liquid resin is applied to the seam loop groups LA and LB, and then dried and solidified to join and integrate the seam loops. If the core wire S is made of a thread material made of a resin having a low surface free energy such as a fluororesin, the liquid resin is applied only to the seam loop group, so that the core wire S described later can be easily pulled out. Good.
Then, the heat-set base fabric BA1 was put into a needle punch machine, and bat fibers made of 15 dtex staple fibers were entangled and integrated on both surfaces (outer peripheral surface and inner peripheral surface) to form a felt. Incidentally, batt fiber layer having a basis weight 300 g / m ² on the outer peripheral surface, the inner peripheral surface was laminated with a basis weight of 100 g / m ^2.
Finally, the core wire S was drawn out to complete an end felt, that is, the seam felt 1 of the present invention.

(Example 2)
The thread material A is MD direction thread material, the thread material B is CD direction thread material, and weaving is 3/1 1/3 warp double so that the seam loop interval approximates the fiber diameter of the thread material A. Further, the supply speed of the CD direction yarn material and the supply speed of the MD direction yarn material were adjusted on the loom to obtain a base fabric BA2 having a seam loop interval of 0.2 mm. Otherwise, the seam felt 2 of the present invention was completed in the same manner as in Example 1.
(Example 3)
A base fabric BA2 was obtained in the same manner as in Example 1 using the thread material C as the MD direction thread material and the thread material B as the CD direction thread material. Next, the base fabric BA2 was heat-set in the same manner as in Example 1 to stabilize the seam loop group. However, in Example 2, the heat setting temperature was adjusted to 180 ° C. or higher in order to melt the copolymer nylon component (sheath portion) of the thread material C and integrate the seam loops by thermal bonding. Otherwise, the seam felt 3 of the present invention was completed in the same manner as in Example 1.

Example 4
A base fabric BA3 was obtained using the thread material A as the MD direction thread material and the thread material B as the CD direction thread material. Since the MD direction yarn material was woven by supplying three yarns to the weaving machine, the seam loop formed a group of three seam loops. Otherwise, the seam felt 4 of the present invention was completed in the same manner as in Example 1.

(Example 5)
A base fabric BA4 was obtained using the thread material A as the MD direction thread material and the thread material B as the CD direction thread material. In addition, since the MD direction thread material prepared the four yarns and supplied them to the loom and woven them, the seam loops formed a group of four seam loops. Otherwise, the seam felt 5 of the present invention was completed in the same manner as in Example 1.

(Comparative example)
The base material B was obtained by weaving 3/1 1/3 warp with the thread material A as the MD direction thread material and the thread material B as the CD direction thread material. The MD direction yarn material was continuously woven with one yarn, and the MD direction yarn material was folded at the end portion to form a pair of upper and lower structures as shown in FIG.
Thereafter, the seam felt 6 of the comparative example was completed in the same manner as in Example 1.

The seam strength of the seam felt produced in the above examples and comparative examples, the state in which the seam loops were engaged, and the felt workability were evaluated. The results are shown in Table 1 as a list.
here,
-The seam strength is expressed by kg / 5 cm when the seam loop is alternately meshed and the core wire is inserted.
-Regarding the meshing state of the seam loop, the inclination of the seam loop and the pulling state toward the root of the loop were examined. A seam portion having a slope or pull-in of less than 5 points per 1 m was good, 5 points or more and 10 points or less were good, and 10 points or less were considered bad.
-Regarding the felt workability, the time required for seaming (working time per meter in the CD direction; in minutes) was measured after placing the seam felt on the papermaking machine.

以上の結果について検討する。
シーム強度について、シームフェルト１とシームフェルト５を比較すると、シーム強度に差が出ていないことが分かる。シームフェルト１では、シームループ群の間隔がＭＤ糸２本分開いているが、この程度の間隔では、シーム強度に影響せず、従って、シームループの噛み合わせ状態と掛け入れ性の良いシームフェルト１の評価が高いことが分かる。また、シームフェルト２では、シームループ同士は厳密には接触していないが、シームループ間隔が狭いため、本発明のシームループ群として機能し、シームフェルト１と同様、評価が高いことが分かる。
また、シームフェルト３では、芯鞘複合繊維の糸を使用しているから、液体樹脂が塗布されシームループ近傍で固化しているシームフェルト１と比べてシームループの噛み合わせ状態が良い。
さらに、シームフェルト４は、シーム強度がやや下がるものの、シームループの噛み合わせ状態とフェルト掛け入れ性が良くバランスしている。
なお、シームフェルト５は、シームフェルト４と同様に、シームループの噛み合わせ状態とフェルト掛け入れ性が最も良くバランスしている反面、シームループ群の間隔がＭＤ糸４本分開いているため、シーム強度にやや影響が出ていることが分かる。

Consider the above results.
When the seam felt 1 and the seam felt 5 are compared with each other, it can be seen that there is no difference in the seam strength. In the seam felt 1, the distance between the seam loop groups is two MD yarns open, but this distance does not affect the seam strength. Therefore, the seam loop seam felt and the seam felt have good engagement characteristics. It can be seen that the evaluation of 1 is high. In the seam felt 2, the seam loops are not strictly in contact with each other, but the seam loop interval is narrow, so that the seam loops function as the seam loop group of the present invention, and the evaluation is high as with the seam felt 1.
Further, since the seam felt 3 uses the yarn of the core-sheath composite fiber, the seam loop meshing state is better than the seam felt 1 coated with the liquid resin and solidified in the vicinity of the seam loop.
Further, the seam felt 4 has a good balance between the meshed state of the seam loop and the felt insertion property, although the seam strength is slightly lowered.
As with the seam felt 4, the seam felt 5 has the best balance between the seam loop meshing state and the felt insertion property, but the seam loop group is spaced apart by four MD yarns. It can be seen that the seam strength is slightly affected.

1 is a schematic perspective view of a felt for papermaking with ends. (A) And (b) is explanatory drawing of the meshing operation | work of the felt for paper-making ends. The perspective view of the seam loop part of the felt for paper-making ends. FIG. 3 is a perspective view of a finished papermaking felt in a completed state. The perspective view of the seam loop part of the felt for papermaking of the present invention. Sectional drawing of the CD direction of the felt for edged paper manufacture of other embodiment of this invention. The perspective view of the meshing state of the seam loop part of the felt for papermaking of the present invention.

Explanation of symbols

BA: Base fabric L: Loop LA: Seam loop group LB: Seam loop group F: Felt

Claims (4)

A felt for a papermaking machine having seam loops at both ends in the MD direction of an end-like base fabric, wherein a bat fiber layer is entangled and integrated with the base fabric by a needle punch,
A plurality of seam loops are aligned to form a set of seam loop groups, and seam core wires are inserted into common holes formed by alternately engaging the seam loop groups with both ends in the MD direction. It is characterized by being
Felt with seam for papermaking.   The felt with a seam for papermaking according to claim 1, wherein the seam loop group is formed by two or three seam loops.   The felt with a seam for papermaking according to claim 1 or 2, wherein the seam loops forming the seam loop group are integrated by bonding with an adhesive.   The MD direction yarn material forming the seam loop group is a yarn of a core-sheath composite fiber comprising a sheath portion containing a low melting point component and a core portion containing a high melting point component, and the MD direction yarn material is at both ends in the MD direction. The felt with a seam for papermaking according to claim 1 or 2, wherein the seam loop group is formed in the seam loop, and the seam loop is integrated by thermal bonding.

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