JP4173080B2 - Corrugator belt - Google Patents

Description

  The present invention relates to an improvement of a corrugator belt used in a corrugator machine for producing a corrugated cardboard sheet.

  When producing a corrugated cardboard sheet by pressure-bonding the single-sided corrugated paper coated with adhesive and liner paper with a glue machine, as shown in FIG. 1, a double corrugator machine comprising a heating part 1 and a cooling part 2 is used. A corrugator belt 4 formed by joining a thick fabric endlessly as a cardboard sheet conveying means is disposed on the facer unit 3.

  The single-sided corrugated cardboard 5 and the liner paper 6 to which the adhesive is applied are supplied to the double facer unit 3 while being pressed by the corrugator belt 4 and heated to 180 to 200 ° C., the corrugator belt 4 and It is dried and bonded by pressure contact with the ballast roll 8 and formed into a corrugated cardboard sheet 9 having a predetermined thickness.

The properties required for the corrugator belt 4 are moderate weight, rigidity and thickness, and durability against heat in order to maintain adhesion to the corrugated cardboard sheet 9 and to uniformly transmit the applied pressure transmitted from the ballast roll 8 to the corrugated cardboard sheet 9. I need sex. As the corrugator belt 4 that can satisfy these requirements, for example, a multilayer woven cotton belt as shown in FIG. 2 is frequently used. However, there is a problem that the cotton belt is too hard and the noise is too high just by making the cotton belt into a multi-layer woven,
In order to solve the above problems, the following proposals have been made conventionally.
The one disclosed in Japanese Patent Laid-Open No. Sho 50-71965 has a tensile layer (intermediate layer) 50 made of a material that is strong and hardly stretched as shown in FIG. For example, both sides are covered with an outer layer 51 made of a highly hygroscopic fiber material such as polyester fiber yarn mixed with cellulose fibers. As its effect, the hygroscopicity is remarkably improved, and antistatic properties and smooth conveyance of the corrugated cardboard sheet are realized.

  In Japanese Patent Application Laid-Open No. 61-287607, as shown in FIG. 4, a large-diameter monofilament yarn is used for the warp 52, a large-diameter monofilament yarn is used for the weft 53 of the surface layer and the intermediate layer, and the weft 54 of the back layer is thick. Disclosed is a multi-woven fabric using a high-quality spun yarn or drawn yarn. As its effects, the durability, the drying property, the air permeability and the improvement of the smoothness of the cardboard sheet are mentioned.

  JP-A-5-93342 has an intermediate ply 57 that absorbs tensile force and is sandwiched between upper and lower plies 55 and 56, as shown in FIG. Arranged over at least two wefts 56a, the upper and lower plies 55, 56 form a group of warps that are offset from each other, all the plies are entangled with each other by knots 57a-57d, and the wefts are in the ply The thing of the structure connected by is disclosed. As its effect, it is mentioned that the noise level at the place of use is reduced by excellent silent running and the life is extended.

Here, as a required characteristic for a general corrugator belt,
1. Heat resistance,
2. Smoothness to give sheet adhesion,
3. Appropriate thickness and rigidity to transmit the load transmitted from the ballast roll evenly to the sheet as the pressure adhesive force between the single-sided cardboard sheet and liner paper,
4). Hygroscopicity and heat retention to promote drying,
5. The running property and dimensional stability for accurately conveying the sheet can be mentioned. And from a usage point of view,
6). Low noise,
7). It is difficult for dirt to adhere, and the attached dirt can be easily removed,
8). It is required to withstand long-term use.

  Conventionally, it has been sufficient to satisfy the above-mentioned characteristics to some extent, but recently, it is impossible to meet the demand unless all of the above-mentioned characteristics are satisfied.

  In recent years, the manufacturing apparatus has been improved, but a new problem has been generated even in the improved portion, which brings a new problem to the corrugator belt.

  For example, in FIG. 1, the hot plate 7 may bend to the side in contact with the corrugated cardboard sheet 9 during use, and the heating surface of the hot plate 7 and the corrugated cardboard sheet 9 are not in contact with each other at the central portion. It has been found that heat is not sufficiently transmitted to the sheet 9, and as a result, a problem such as creating a defective product occurs.

  In order to solve the problem, an apparatus disclosed in Japanese Patent Laid-Open No. 6-328596 has been proposed. In this apparatus, as shown in FIG. 6, the corrugator belt 21 is pressed uniformly against the heating surface by the contact member 24 from the back surface of the corrugator belt 21. Specifically, the contact member 24 is slidably disposed with respect to the corrugator belt 21, and the contact member 24 is formed of a rectangular plate group supported by a support frame body extending in the lateral direction. Each rectangular plate is biased with respect to the corrugator belt 21, and can be individually moved up and down and pivoted around an imaginary longitudinal center line. As a result, even if the heating plate 23 has a curved surface, the cardboard sheet 22 can be heated uniformly.

  However, in the above-described case, the contact member 24 presses the corrugator belt 21, and therefore the pressure of the contact member 24 is applied to the surface of the corrugator belt 21 that contacts the contact member 24. For this reason, the fuzz of the corrugator belt 21 increases, resulting in a lot of fuzz scattering and new problems that damage due to wear occurs.

  Specifically, when the fluff is scattered, the fluff adheres to the drive roll surface of the corrugator machine, and the corrugator belt 21 and the drive roll become slippery. Even if the rotation of the drive roll is increased, the corrugator belt 21 slips. The speed of the corrugator belt 21 does not increase. Further, the scattered fluff has a problem of adhering to the corrugated cardboard sheet 22. Furthermore, there is a problem that the corrugator belt 21 is damaged due to wear and the life is shortened.

  By the way, as the material of the yarn used for the corrugator belt, synthetic fibers can be used alone or in combination with other materials instead of the conventionally used cotton for the purpose of heat resistance and dimensional stability. It has come to become. In the corrugator belt using such a method, the present applicant has made the following two proposals (hereinafter referred to as the preceding two inventions) as sufficiently satisfying these required characteristics.

  The first is JP-A-8-175636, and this corrugator belt is not in contact with the warp yarn 74 on the surface side (hereinafter referred to as PS) 71 in contact with the sheet, as shown in FIGS. 7 and 8. For the warp 76 and the binding warp 77 on the back surface side (hereinafter referred to as “BS”) 73, a mixed yarn of polyester fiber and rayon fiber is used, and for the warp 75 of the intermediate layer 72, a multifilament yarn of polyester fiber is used. Polyester fiber spun yarn is used for the weft 78, and the overall is a four-fold long crimp structure. The PS layer 71 is a 2/2 twill (breaking twill weave) and the BS layer 73 is a 3/1 twill. It is proposed that the PS layer 71 is a 3/1 twill weave (torn twill), and the BS layer 73 is a 2/2 twill weave (torn twill).

  The second is Japanese Patent Application Laid-Open No. 10-30683, which is a proposal for adapting to the improved corrugated sheet manufacturing apparatus in which the contact member is disposed, and this corrugator belt is shown in FIGS. As shown in FIG. 11, a polyester fiber and rayon fiber blended yarn is used for the PS layer, the BS layer, and the binding warp, a polyester fiber multifilament yarn is used for the intermediate layer warp, and a polyester yarn is used for the weft. Each fiber spun yarn is used to form a four-fold weave, the PS is 2/2 twill, 3/1 twill or 1/3 twill, and the BS is 1/3 twill, 2/2 twill or plain weave. And a structure in which any one of the PS and BS is combined, and the degree of freedom and the frictional resistance of the yarn on the back surface side where the contact member contacts are reduced.

However, coupled with problems in the work environment and further higher quality requirements for corrugated cardboard products, higher achievement levels of the required characteristics 1 to 8 are required than conventional corrugator belts.
As described above, one of the characteristics required for the corrugator belt described above requires moisture absorption and heat retention to promote drying (required characteristic 4). However, it has been found that sheet warpage or a “rule cracking phenomenon” in which the corrugated cardboard and the liner paper do not adhere to each other, which easily causes defects in sheet quality.

  Further, the corrugator belt of the preceding two inventions is a variety of corrugator belts, drive rollers and corrugator belts depending on the manufacturing environment, as well as various uses of corrugated cardboard products, types of glue used for bonding, equipment arrangement of corrugator machines, equipment conditions, etc. It has also been found that slippage occurs between the meandering correction guide rolls, and the sheet quality may be deteriorated due to deterioration of accurate sheet travel.

  As described above, even a corrugator belt having a configuration in which synthetic fibers developed in recent years alone or in combination with other materials and the corrugator belt of the preceding two inventions cannot be used satisfactorily depending on the use environment. I understand that there are cases.

  The object of the present invention is to provide a further improved product of the preceding two inventions. Specifically, in addition to the diversification and high quality of the corrugated cardboard sheet as described above, there are various conditions in the manufacturing environment. Provides a corrugator belt with a wide range of functions that can be used more stably.

The present invention is a further improvement of the preceding two inventions, and the present inventors only have the advantage of a cotton-based corrugator belt that has been used in the past and a belt mainly made of a blended yarn of polyester and rayon that has been used in recent years. As a result of analyzing the factors of each problem and researching optimization of composition, the arrangement method and blending ratio of cotton yarn, polyester yarn and rayon yarn, that is, stratification by specific material It has been found that the object of the present invention can be achieved when a corrugator belt is manufactured with a fixed configuration, a weave structure, a mixing ratio of each material, and a fineness and a weave density of each constituent yarn.
Originally, a glue machine is a device that presses and bonds single-sided corrugated board and liner paper between a hot plate and a number of ballast rolls, but direct pressure is difficult to work in the section between the ballast rolls and the ballast rolls. In order to apply the pressure of the roll over a wider range, multiple weaves of cotton-based fabrics that are very stiff and thus thick and tight have been employed. In this case, there was no particular problem regarding the proper water absorption, water retention, and divergence to the outside, which is a function inherent to the cotton belt, but generally adopted to obtain its rigidity and rigidity. Due to the poor surface property due to the woven structure in which the warp of the outermost layer spans only one weft of the outermost layer, running noise was generated between the ballast roll that does not have a fixed bearing and is pressurized by its own weight. Further, the corrugator belt is set wider than the corrugated cardboard sheet, and since the vicinity of the ear portion of the belt is in direct contact with the hot plate near 200 ° C., the cotton that is easily deteriorated by heat is in a state of losing the strength of the portion early. Further, the stretch of the belt mainly made of cotton was large, and there was a problem that the stretch allowance was lost and the belt tension was not applied.

  For this reason, a corrugator belt is constructed by combining polyester and rayon, etc., and attempts have been made to improve the drawbacks. The conventional problems have been improved, but the above-mentioned new problems have occurred. is the current situation.

In particular, the same cellulosic rayon was adopted in place of cotton, but it has been found that the difference in properties between cotton and rayon has created the current problems, leading to the present invention.
That is, the corrugator belt of the present invention for solving the above-described problem is provided with two outermost layers exposed on the front and back sides and an intermediate layer sandwiched between them, and the two outermost layers and the intermediate layer are mutually connected by a binding warp. In the multi-woven corrugator belt bonded to the
The other outermost layer warp yarn is a blended yarn of polyester fiber and rayon fiber, or a blended yarn of polyester fiber and cotton, the intermediate layer warp yarn is a polyester fiber multifilament yarn, and the weft yarn is a polyester fiber alone, or Each of the polyester fibers and cotton twisted yarns is used to make a structure of either a triple woven or a quadruple woven, and each of the one outermost layer and the other outermost layer has a 2/2 broken twill, Either 1/3 broken twill or 3/1 broken twill is selected. {Related to Claim 1}

The intermediate layer is composed of only one layer in the case of triple weave and two layers in the case of quadruple weave.
The warp yarn of the intermediate layer can be a warp yarn entangled with the weft yarn of the intermediate layer in a plain weave structure and / or a core yarn not entangled with any of the weft yarns. {Claim 2 relationship}

  The core yarn is a yarn that is between the weft layers and is not entangled with any of the wefts of the belt as shown in the conceptual diagram of the longitudinal section parallel to the warp yarn of the corrugator belt in FIGS. 15 and 17, for example. Therefore, the weaving density, which is the number of core yarns used, is included in the total weaving density.

In the cotton yarn used for the warp of the one outermost layer, the cotton count of one warp can be 0.2 to 1.0 ^s , and the woven density can be 15 to 55 / 2.54 cm. {Claims 3 and 4} Here, the “cotton count” of the present application means a so-called total value cotton count when a plurality of original yarns are aligned or twisted to form a set of yarns. Shall.

  The single warp means a set of yarns after a plurality of raw yarns are aligned or twisted. {Related to Claim 6}

  The single weft means a set of yarns after a plurality of original yarns are aligned or twisted. Moreover, when the mixing ratio in the case of the twisted yarn of the said cotton and polyester fiber is set to 0: 100, it means using a polyester fiber alone.

  According to the present invention, in the multi-woven corrugator belt in which two outermost layers and an intermediate layer sandwiched between the two outermost layers and the intermediate layer sandwiched between the two outermost layers are joined together, the cotton yarn is used for the warp of one outermost layer. It is not only the intermediate characteristics of the belt using the cotton-based belt of No. 1 and the synthetic fiber of the preceding two inventions, but it has a lot of advantages, and the defects are almost eliminated. In addition to diversification and improvement in quality of corrugated cardboard sheets, a corrugator belt having a wide range of functions that can meet various sheet manufacturing conditions even under various conditions in the manufacturing environment can be obtained.

  In other words, the moisturizing property of an appropriate amount of cotton provides a more uniform and stable strong adhesive force in the adhesiveness of the corrugated cardboard sheet.

  In addition, even in a manufacturing environment where slipping between the corrugator belt and the seat, drive roller or guide roll is likely to occur, the surface side of one outermost layer covered with cotton is placed on the side where slip is likely to occur. If used, slip can be prevented.

  Furthermore, since the cotton layer is arranged in only one layer among the layers woven in multiple layers, moderate rigidity is obtained, and it also prevents drooping of the belt ear due to insufficient rigidity in the belt width direction, Also, noise can be suppressed.

  Furthermore, when a structure is selected in which the binding warp joins one outermost layer and the intermediate layer and the other outermost layer and the intermediate layer and does not penetrate the cross section of the corrugator belt, it has two surfaces with different functional differences. As a belt, the fiber characteristics of the respective warp yarns on the surfaces constituting the two outermost layers can be expressed to the maximum.

  Further, in the portion including both ears except for the central portion in the width direction of the belt, if the warp of the one outermost layer is replaced with cotton yarn and a twisted yarn of cotton and polyester fiber is used, elongation of the belt can be prevented. I can do it. Moreover, the corrugator belt without elongation according to specification environment is obtained by adjusting the replacement amount of the twisted yarn of cotton and polyester fiber.

  In order to eliminate the above-mentioned cracking phenomenon of the corrugated cardboard sheet, it is necessary to control the moisture transfer to the belt so that the paste can maintain an appropriate moisture so that it has an appropriate viscosity. It is necessary to maintain high hygroscopicity and water retention. In recent years, it has been understood that it is more important to maintain an appropriate viscosity of the glue while the bonding speed is increased. In this regard, we tried to investigate the characteristics of rayon and cotton. Rayon has a moisture content of 1.5 to 2 times higher than that of cotton and has a high hygroscopic property, but water retention, that is, the property of retaining the absorbed moisture may be weak. That is, rayon has a tendency to absorb moisture from the sheet abruptly and easily diverge to the outside. This tendency seems to cause overdrying and the occurrence of the ruled cracking phenomenon. Also, steam escapes actively through the corrugator belt, and steam containing glue adheres to and accumulates on the ballast roll, causing roll rotation failure, and further rusting by the steam causes rust to corrugated cardboard products. In some cases, the adhesion of is remarkable. In order to improve this, it has been found that it is necessary to devise a method for keeping moisture in the belt moderately and not causing a sudden vapor escape while smoothly absorbing moisture from the corrugated cardboard sheet.

  For this purpose, in the layered construction of the corrugator belt, it is considered most preferable to place rayon on the corrugated sheet side layer and cotton on the ballast roll side layer. As a result, it was confirmed that the problem was solved. However, since rayon also does not have high heat resistance when used alone, polyester having the highest heat resistance among general chemical fiber yarns was blended. As a result, the cotton layer does not come into contact with the high-temperature corrugated cardboard sheet side, and in particular, a layer of a blended yarn of polyester having higher heat resistance and rayon having higher heat resistance than cotton comes into contact with the earliest area near the ear. It is possible to take measures against thermal degradation. This configuration is a basic requirement of the present invention.

  Therefore, according to the present invention, in a multi-woven corrugator belt in which two outermost layers (one outermost layer and the other outermost layer) and an intermediate layer sandwiched between the two outermost layers are joined together by a binding warp, Cotton yarn is used for the outermost warp, and a moderate amount of cotton moisturizes to reduce the moisture diffusion speed of the glue when the sheet is bonded and dried. Is semi-cured and pressure-bonded in a state where the timing of increasing the adhesive force is kept moderate, so that a more uniform and strong adhesive force can be obtained.

  The above configuration also assumes improvement on the problem of slip between the corrugator belt and the driving roller and the corrugator belt and the guide roll for meander correction. As will be described later, the belt and the contact object are driven by arranging the cotton layer side fabric surface, which has a higher coefficient of friction than the fabric surface of the layer using the mixed yarn of polyester fiber and rayon fiber, on the driving roller side. The frictional force is increased and slipping is prevented.

  However, in the basic requirement of the present invention, particularly with respect to the purpose of controlling steam escape, for example, when the temperature of the hot plate of the cardboard sheet manufacturing apparatus is relatively low in the manufacturing condition of about 180 ° C., and manufacturing a thin cardboard sheet In such a case, when the heat capacity of the hot plate is set to be relatively low, there is a case where the heat retention and water retention of the corrugator belt must be further increased to suppress the escape of steam. In such a case, the function of the corrugator belt is adjusted using a blended yarn of polyester fiber and cotton instead of the blended yarn of polyester fiber and rayon fiber used for the warp of the other outermost layer. I am going to do that. In the manufacturing environment as described above, since the hot plate temperature is relatively low, there is no problem even if the heat resistance on the paper contact side surface of the corrugator belt is somewhat lowered.

Next, with regard to noise, a thick fabric with a plain weave that is highly filled with cotton yarn, such as a corrugator belt mainly made of cotton, which has been the mainstream in the past, is very stiff. Since it is known that a problem occurs, the corrugator belt of the present invention has a cotton layer disposed only on one warp of the layers woven in multiple layers so as not to have excessive rigidity, and the other Polyester fiber or a blended yarn of polyester fiber and rayon fiber was arranged on the warp of this layer. Also, by selecting the structure of the 2/2 torn twill weave, 1/3 torn twill or 3/1 torn twill, not the plain weave of the two outermost layers, and long crimping the warp of the outermost layer The outermost layer was smoothed to prevent noise generated between the belt and the contact object during belt running.
Note that it is not preferable to adopt a 1/3 broken twill structure in which the warp straddles only one weft on the surface side of the cotton layer. 6 is intended for use in a device that does not have the ballast roll in FIG. 6 and is pressed by a contact member. That is, in the case of a device that presses with a contact member, there is no ballast roll, so there is no concern about noise. Rather, it is necessary to take measures against fluffing of the corrugator belt due to wear with the contact member. For this purpose, it is preferable that the corrugator belt surface in contact with the contact member is arranged with a surface that is a 1/3 broken twill that makes point contact rather than a belt surface in which the warp is floated over a number of wefts. by.
In addition, the belt elongation due to use, which was a disadvantage mainly of cotton, is due to the fact that the cross-sectional shape of the yarn is not collapsed due to the goodness of the cotton spinning in addition to the elongation of the fiber itself due to water absorption, especially during weaving. Since the crimp when the warp straddles the weft is large, it is constituted by an elongation (commonly referred to as “tissue elongation”) that is likely to occur with respect to the tension or pressure in the thickness direction of the belt after weaving. Though considered, the corrugator belt of the present invention arranges a multifilament yarn of polyester fiber in the warp of the intermediate layer, and the structure of the intermediate layer is a plain weave and / or A core yarn that does not have entanglement crimps with the weft yarn (the structure does not stretch during tension) is used, and at the same time, either a polyester fiber alone or a twisted yarn of polyester fiber and cotton is placed on the weft yarn. By Rukoto, and easily flattened cross section of the weft than in the case of 100% cotton weaving, suppressed tissue elongation due to external forces after weaving. This makes it possible to adjust the balance between the rigidity of the corrugator belt of the present invention and the required degree of elongation resistance. In other words, the polyester multifilament provided in the intermediate layer with appropriate rigidity contributes to the dimensional stability in the belt traveling direction by minimizing the warp structure elongation during use. Can be suppressed.

  In addition, as one of the forms of the corrugator belt of the present invention, in order to maximize the fiber characteristics of the respective warp yarns on the surfaces constituting the two outermost layers, and in order to achieve stable and strong bonding, A structure that reduces the number of exposed portions of the yarn on the surface was adopted. That is, the binding warp has a structure in which one of the outermost layer and the intermediate layer and one of the other outermost layer and the intermediate layer are bonded to each other so as not to penetrate the cross section of the corrugator belt.

  In addition, the corrugator belt of the present invention is one of the forms, and as a countermeasure measure when the elongation of the cotton yarn used for one surface layer is considered to be larger depending on the usage environment, both ears except for the central portion in the width direction of the belt are used. In the portion including the above, the warp of the one outermost layer was replaced with cotton yarn, and twisted yarn of cotton and polyester fiber was used. This is sometimes combined with the belt sag, and if this occurs, this measure may be taken precautionary, especially since it is often the part except the center. In addition, the twisted yarn of cotton and polyester fiber, which is used instead of the one outermost warp, is a twisted yarn substantially matched to the apparent thickness of the warp at the center. As an example, if the warp at the center in the width direction of the outermost belt is one of 11 cotton 6S twisted yarns, 5 cotton 6S yarns and 5 polyester yarns are used. A spun yarn count of 10S is used.

  Moreover, the corrugator belt of the present invention has, as one form, a cotton yarn used for one outermost warp, having a warp count of 0.2 to 1.0 S and a weave density of 15 to 55/2. .54 cm, more preferably, the cotton count of one warp is 0.4 to 0.7 S, and the weave density is 22 to 45 / 2.54 cm. If the count of the cotton yarn used is too thin, the preferred thickness of the cotton layer is insufficient. Conversely, if the count is too thick, surface smoothness cannot be obtained. The weaving density varies depending on the number of warp yarns used, but at least when the space between the warp yarns or the intermediate layer is exposed, the function of the outermost layer of the corrugator belt of the present invention cannot be effectively expressed. It is necessary to select a range.

  The other outermost warp also has the same purpose as the above-mentioned one outermost warp, and in the blended yarn of the polyester fiber and the rayon fiber to be used, the cotton count of one warp is 0.2-1. The cotton count of one warp is 0.4 to 0.7 S, and the weave density is 22 to 45 yarns / 2.54 cm.

  By the way, when the blend ratio of the polyester fiber and the rayon fiber was examined, in the relationship between the blend ratio and the strength characteristics, when the ratio of the polyester fiber by weight ratio was lower than around 55%, the strength suddenly decreased, It has been found that the strength increases from around 55% to 65%, and when it exceeds 65%, the strength becomes slightly stronger even if the proportion of the polyester fiber increases. Taking into account rigidity, it was found that the blend ratio of the polyester fiber and the rayon fiber is appropriately in the range of 65:35 to 55:45, and the ratio of the blend ratio of 65:35 is polyester. It has been found that the respective properties of the fiber and the rayon fiber are most effectively utilized, and is optimal as a corrugator belt.

  In addition, when using a blended yarn of polyester fiber and cotton instead of the blended yarn of polyester fiber and rayon fiber used for the warp of the other outermost layer, the cotton count of one warp is 0.2 to 1.0S, the weave density is 15-55 / 2.54 cm, and more preferably, the cotton count of one warp is 0.4-0.7S, and the weave density is 22-45 / 2.54 cm. In addition, regarding the strength characteristics regarding the blend ratio of polyester fiber and cotton, it is understood that the blended yarn ratio of the polyester fiber and rayon fiber and the tendency of the strength characteristics are the same in the case of this blended yarn. The preferred blending range is 65:35 to 55:45 by weight.

As for the weft, as described above, it is not preferable to use 100% cotton. Therefore, either polyester fiber alone or twisted yarn of cotton and polyester fiber was selected, and the blending according to the use conditions was selected. In this regard, the relationship between the weft material and the elongation of the corrugator belt was investigated and found to be very large. In the investigation, in the corrugator belt of Example 1 described later, the elongation behavior of the belt was confirmed by changing only the mixing ratio of cotton (C) and polyester (T) used for the weft. The test belt is hung on a paper machine mini-size test machine, and it is about 100 under a tension of 5 kg / cmf.
Run at m / min, raise the temperature of the drying cylinder to 160 ° C, place a water tank on the belt running path, put water at regular intervals, dip it, and drain the water again. The elongation percentage when wet and dry was measured. The results obtained from this test are shown in FIG. In the figure, Wet is the wet elongation and Dry is the dry elongation. The numerical value in the upper frame in the figure is the blend ratio.

  From FIG. 12, it can be seen that the higher the mixing ratio of the weft polyester, the smaller the belt elongation rate, and the smaller the difference in the wet and dry elongation rates. The higher the cotton mixing ratio, the greater the belt elongation rate and the wet and dry elongation. It was found that the rate difference was also large. From this, in the case of an apparatus or manufacturing environment that gives priority to the rigidity of the corrugator belt, the ratio of the cotton yarn should be increased, and when priority is given to the prevention of elongation of the corrugator belt, the ratio of the polyester fiber may be increased. I understand. Therefore, the mixing ratio in the case of twisted yarn of cotton and polyester fiber used for weft is set to 0: 100 to 80:20 (0: 100 means polyester fiber alone) and adjusted according to the manufacturing equipment and manufacturing environment. It was decided to.

  In consideration of the belt thickness (10 to 11 mm) normally required for the corrugator belt, the thickness of the weft is 0.1 to 1 when the cotton count of one weft is taken into consideration from the entanglement balance with the warp of the warp layer. 0.0S is preferable, and a range of 0.2 to 0.5S is more preferable.

  In addition, the weaving density of all the warps is 60 to 220 / 2.54 cm in terms of the weaving and structural balance of the corrugator belt in order not to leave a space between the two outermost warps or expose the intermediate layer. The range is preferable, and the range of 95 to 180 yarns / 2.54 cm is more preferable. When the cotton count of all warps is 0.45 to 0.6 S, the range of 115 to 140 yarns / 2.54 cm is particularly preferable. It turned out to be preferable.

  Further, the corrugator belt of the present invention has a structure of either a triple weave or a quadruple weave. As shown in FIG. 15, a core yarn that does not intertwine with any of the wefts of the belt is provided between the weft layers as necessary. Can also be inserted. Its purpose is to prevent stretching in the warp direction of the belt, and as a core yarn, usually a multifilament yarn of polyester fiber is used, but it can be applied to the corrugator belt usage environment and can achieve the same purpose. The material is not limited.

  In the belt production, in order to further improve the dimensional stability, it is possible to select a yarn having a low heat shrinkage rate or a heat set yarn as the yarn to be used.

  In addition, if necessary, a synthetic resin is applied to the surface of the corrugator belt that is in direct contact with the contact member, and then it is possible to prevent the occurrence of fuzz and reduce the occurrence of wear damage. As the resin to be applied, for example, acrylic ester resin, which is usually used for resin processing of a dryer canvas used in a dry part of a paper machine, is effective.

  It is also possible to take antistatic measures as necessary. For example, a known technique such as application of a known conductive resin or use of a conductive fiber such as metal fiber or carbon fiber as a part of the warp of the outermost layer of the present invention can be applied.

Embodiments of the present invention will be described below with reference to the drawings.
[Embodiment 1] FIG. 13 shows a corrugator belt of Embodiment 1, and the figure shows a cross section in the warp direction.

  The woven structure was a quadruple woven structure, and the structure of one outermost layer and the structure of the other outermost layer were both 2/2 broken twills. There are two intermediate layers, and the warp yarns of each layer are structured over one weft yarn. 13 to 15 do not distinguish between “PS” and “BS” because the outermost layer on either the front or back side can be on the “PS” side.

  One of the outermost warp yarns is a twist of 11 cotton yarns of cotton count 6S, and the other outermost warp yarn is polyester (hereinafter referred to as T) and rayon fiber (hereinafter referred to as R). 3 blended yarns (hereinafter referred to as (T + R)) obtained by twisting 8 strands of 12S yarns and drawing three more. A binding warp (hereinafter referred to as a binding yarn) is obtained by further arranging two twisted yarns of six (T + R) 12S yarns. The warp yarns in each intermediate layer are two multi-filament yarns of 1670 dtex twisted together and twisted together. The weft is a combination of three 6S cotton yarns and 22 T spun yarns 10S.

  The yarns of (T + R) and T used in this example are low heat shrinkage yarns, and the shrinkage rate is (T + R) 2.1% at 180 ° C, 3.6% at 200 ° C, T was 2.1% at 180 ° C and 3.3% at 200 ° C. The heat shrinkage rate is not limited to this value, and it is of course possible as long as it is within the range where the corrugator belt of the present invention can be realized.

The density was 131.4 pieces / 2.54 cm for all warps and (6.0 × 4) pieces / 2.54 cm for wefts. As a result, the obtained corrugator belt had a thickness of 10.36 mm, a weight of 7.53 kg / m ² , and an air permeability of 44 cm 3 / cm ² · min.
[Embodiment 2] FIG. 14 shows a corrugator belt of Embodiment 2, which shows a cross section in the warp direction.

  In this example, the woven structure is a quadruple woven structure, the structure of one outermost layer is a 2/2 broken twill, and the structure of the other outermost layer is a 3/1 broken twill. There are two intermediate layers, and the warp yarns of each layer are structured over one weft yarn. Each of the yarns used for the warp of one outermost layer, the warp of the other outermost layer, the binding yarn, and the warp of the intermediate layer is the same as in Example 1, and for the weft, 32 T spun yarns 10S are used. It is twisted.

The density was 131.2 / 2.54 cm for all warps, and (6.2 × 4) /2.54 cm for wefts. As a result, the obtained corrugator belt had a thickness of 10.50 mm, a weight of 7.78 kg / m ² , and an air permeability of 36 cm 3 / cm ² · min.
[Embodiment 3] FIG. 15 shows a corrugator belt of Embodiment 3, which shows a cross section in the warp direction.

  In this example, the woven structure is a triple woven structure, and the structure of one outermost layer and the structure of the other outermost layer are both 2/2 broken twills. A warp yarn entangled only with the weft yarn of the intermediate layer was not used, and two core yarn layers were arranged. (Core yarn A and core yarn B were used.) The core yarn was obtained by aligning two twisted yarns of 1670 dtex of T multifilament yarns and then drawing two more. It should be noted that the yarns used for one outermost layer warp, the other outermost layer warp, and the binding yarn are the same as in Example 1. The weft is a combination of four 6S cotton yarns and 28 T spun yarns 10S.

  The density was 131.0 / 2.54 cm for all warps. However, in this embodiment, a core yarn is used for the intermediate layer, and the woven density of the core yarn is included in the woven density of all the warp yarns. .3 pieces / 2.54 cm.

The weft was (5.9 × 3) /2.54 cm. As a result, the corrugator belt obtained had a thickness of 10.09 mm, a weight of 7.23 kg / m ² , and an air permeability of 55 cm 3 / cm ² · min.
[Comparative Example 1] FIG. 16 shows a corrugator belt of Comparative Example 1, which shows a cross section in the warp direction.

  The woven structure was a quadruple woven, the PS surface layer was a 2/2 broken twill, and the BS back layer was a 1/3 broken twill. The warp yarns in the intermediate layer are structured so as to straddle one weft in each layer. In addition, the surface layer warp and the back layer warp are obtained by further arranging three twisted yarns of eight (T + R) 12S yarns. The yarns used for the binding yarn, the warp yarn of the intermediate layer and the weft yarn are the same as those in the second embodiment.

The density was 130.5 pieces / 2.54 cm for all warps and (6.2 × 4) pieces / 2.54 cm for wefts. As a result, the obtained corrugator belt had a thickness of 10.50 mm, a weight of 7.85 kg / m ² , and an air permeability of 35 cm 3 / cm ² · min.
[Comparative Example 2] FIG. 17 shows a corrugator belt of Comparative Example 2, which shows a cross section in the warp direction. The woven structure is a six-fold weave. In this comparative example, as a distinction between the warp of the surface layer and the warp of the intermediate layer, the warp other than the binding yarn that is partially exposed on the PS surface is used as the warp of the surface layer. The warp of the surface layer is obtained by further arranging two twisted 8S cotton yarns. The warp yarns entangled with the wefts in the intermediate layer and the warp yarns in the back layer of the BS are 15 cotton yarns 8S twisted. The binding yarn is obtained by twisting two cotton yarns 8S twisted with two twisted yarns of 280 dtex of T multifilament yarns, and twisting them together. In this comparative example, a core yarn was arranged at the center of the intermediate layer as shown in the figure. This core yarn is obtained by twisting four 280 dtex yarns of T multifilament yarns and twisting them together. The wefts are twisted together with 12 cotton 8S twisted yarns and 3 T spun yarn 10S twisted yarns. The density was 114.1 / 2.54 cm for all warps. However, this comparative example employs a core yarn for the intermediate layer, and the woven density of the core yarn is included in the woven density of all warps. The woven density of the core yarn alone is 14.3 pieces / 2.54 cm.

  The weft was (7 × 6) pieces / 2.54 cm.

As a result, the obtained corrugator belt had a thickness of 10.80 mm, a weight of 8.42 kg / m ² , and an air permeability of 70 cm 3 / cm ² · min.
[Evaluation test and results]
1. About belt stretch

The elongation of the belt was measured by using a constant speed extension type universal material testing machine (Instron, model 5568) based on the general textile test method (Method A) of JIS L 1096. The elongation at 3 kgf / cm and 5 kgf / cm was obtained from the tension-strain curve of the measurement result. The results are shown in Table 1.

From the results, although Example 1 had a higher elongation than the belt mainly composed of the synthetic fiber blended yarn of Comparative Example 1, the elongation was smaller than that of the cotton-based belt of Comparative Example 2. It is a value closer to Comparative Example 1 than Comparative Example 2, and it can be determined that the corrugator belt of Example 1 is hard to stretch in actual use.
2. Thickness change under surface compression

  When the contact member presses the corrugator belt, the contact member sinks into the corrugator belt. When this amount of sinking increases, it is considered that the friction between the contact member and the corrugator belt increases. Therefore, a test was conducted to confirm how the thickness of the corrugator belt under pressure decreases.

This test uses a universal material testing machine (Instron, model 5568). A sample of a corrugator belt with a width of 10 cm and a length of 10 cm is fixed to the testing machine, and the sample is gradually pressed from under no load. Compressed. The thickness at the time of pressurization at 5 kgf / cm ² and 10 kgf / cm ² was read from the obtained thickness-load curve, and the ratio (%) of the thickness reduction to the thickness under no load was calculated as the thickness reduction rate. The results are shown in Table 2.

Although the corrugator belt of Example 1 has a larger thickness reduction rate than the cotton-based belt of Comparative Example 2, the thickness reduction rate is smaller than that of a belt mainly composed of synthetic fiber blended yarns as in Comparative Example 1. It can be determined that the finish is sufficiently harder than Comparative Example 1. From this result, even when the contact member presses the corrugator belt of the present invention, it is determined that the amount of the contact member sinking into the corrugator belt is reduced.
3. About coefficient of friction

The sliding with the sheet and the sliding between the driving belt and the driving drum of the corrugator machine were measured. As shown in FIG. 18, a sample 82 of each belt is overlaid on a cardboard sheet 81, a constant load W = 5 kg is applied, and the belt is pulled by a universal material testing machine (Instron, model 5568). ,
1. Force F1 when starting to move
2. Force F2 to move after starting to move
Was measured. Friction coefficients μ1 and μ2 were calculated from the frictional forces F1 and F2 and the load (W) by the following equations, respectively.
Friction coefficient (μ) = Friction force (F) / Load (W)
Therefore, μ1 is a static friction coefficient and μ2 is a dynamic friction coefficient. In Comparative Examples 1 and 2, the surface in contact with stainless steel and corrugated cardboard was the surface layer on the PS side. The results measured by the above method are shown in Table 3.

As described above, in Example 1, when both the static friction coefficient μ1 and the dynamic friction coefficient μ2 are used on the cotton layer side (one outermost layer side) of the belt, the non-cotton layer side (the other outermost layer side) is used. Can be seen to be a little bigger. When the results are seen together with Comparative Examples 1 and 2, the surface of Comparative Example 1 is a non-cotton layer surface, and the surface of Comparative Example 2 is a cotton layer surface, so the cotton layer surface has a higher coefficient of friction than the non-cotton layer surface. I understand that. Judging from this result, it can be evaluated that the coefficient of friction of the cotton layer side of Example 1 is higher than that of Comparative Example 1 and includes elements that are less likely to slip.
4). About bending resistance

In order to bend smoothly and softly when passing through the roll of a corrugator machine or when the corrugator belt is bent, the belt needs to have a certain degree of softness, but to prevent the belt body from bending, ear sag and drooping. A certain rigidity is also necessary, and this confirmation was performed. As shown in FIG. 19, a sample 84 of 2 cm width × 18 cm length of each belt, which was allowed to cool for 5 minutes after treatment at 120 ° C. for 20 minutes, was cantilevered (belt gripping length at the support end: 2 cm, net overhang length) The deflection amount mm of the free end when the weight 85 of 50 g was placed on the free end was measured, and the bending resistance was evaluated. That is, the smaller the amount of deflection, the greater the rigidity, and the greater the amount of deflection, the higher the flexibility. The measurement results are as shown in Table 4,

  The warp direction means the warp direction and is the traveling direction of the corrugator belt. The horizontal direction means the weft direction and indicates a direction perpendicular to the traveling direction of the corrugator belt. In bending resistance, Example 1 is between Comparative Example 1 and Comparative Example 2. Among these, it can be seen that the bending resistance in the vertical direction is closer to Comparative Example 1 in Example 1, and the bending flexibility in the horizontal direction is closer to Comparative Example 2 in Example 1. The measurement was performed under normal humidity.

Therefore, Example 1 is judged to have low noise characteristics because it smoothly and softly bends when the corrugator machine passes a roll or the like or when the corrugator belt is bent. On the other hand, in order to uniformly transmit the force of the ballast roll on the side not in contact with the sheet to the sheet by the rigidity of the corrugator belt, a certain level of rigidity is required. Since Example 1 is a numerical value close to the cotton-based belt of Comparative Example 2, it is determined that there is sufficient rigidity. It can be evaluated that Example 1 has many advantages of Comparative Examples 1 and 2.
5. About noise measurement

In order to confirm whether or not a corrugator belt having low noise characteristics was obtained, noise measurement was performed using a test apparatus shown in FIG. The test sample was 150 mm in width with the running direction of the belt as the warp direction of the sample. The sample 86 is fixed to one end of the fixing portion 87, raised vertically to the warp direction, held on a drivable roll 88 at an angle of 90 °, passed to the horizontal portion, and held on the other roll 89. After weighing, a 3 kg weight 90 was attached. The driving roll 88 and the other roll 89 are chrome-plated surfaces and have a diameter of 150 mmφ. Further, a stainless steel bar 91 having a diameter of 3 mmφ is firmly fixed to the surface of the drive roll symmetrically with respect to the roll center axis over the entire width in the roll axis direction. After fixing the sample, the driving roll was rotated at 250 rpm in the direction of the arrow, and noise measurement was performed at a height position of 300 mm on the driving roll 88 with a noise measuring device 92 (manufactured by Lion Corporation, model number NL-04). That is, in this test, the sample does not travel, and the noise during actual traveling is evaluated based on the loudness of the sliding sound between the belt and the drive roll. In addition, Example 1 measured about each of the "cotton layer side" when one outermost layer is arrange | positioned at the drive roll side, and the other side when it arrange | positions conversely. In Comparative Examples 1 and 2, the measurement was performed with the back layer surface disposed on the drive roll side. Table 5 shows the measurement results.

  As a result, it was found that even when the belt surface was replaced and mounted in Example 1, the low noise level close to that of Comparative Example 1 which is currently regarded as a low noise belt was achieved.

The side view of a corrugator machine. The cross-section figure of the multilayer woven cotton belt used as a corrugator belt. The cross-section figure of the corrugator belt of Unexamined-Japanese-Patent No. 50-71965. The cross-section figure of the corrugator belt of Unexamined-Japanese-Patent No. 61-287607. The cross-section figure of the corrugator belt of Unexamined-Japanese-Patent No. 5-93342. The side view of the apparatus which presses a corrugator belt with a contact member from a back surface. The cross-section figure of the corrugator belt of Unexamined-Japanese-Patent No. 8-175636. The cross-section figure of the corrugator belt of Unexamined-Japanese-Patent No. 8-175636. The cross-sectional structure figure of the corrugator belt of Unexamined-Japanese-Patent No. 10-30683. The cross-sectional structure figure of the corrugator belt of Unexamined-Japanese-Patent No. 10-30683. The cross-sectional structure figure of the corrugator belt of Unexamined-Japanese-Patent No. 10-30683. The figure which shows the result of the measurement test of the elongation rate at the time of wet and dry of a belt. The woven structure chart of the corrugator belt of Example 1. FIG. The woven structure chart of the corrugator belt of Example 2. FIG. The woven structure chart of the corrugator belt of Example 3. FIG. The woven organization chart of the corrugator belt of the comparative example 1. FIG. The woven organization chart of the corrugator belt of Example 4. FIG. A side view of a friction coefficient measurement tester. The side view of the bending tester of a corrugator belt. Side view of a corrugator belt noise measurement tester.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Heating part 2 Cooling part 3 Double facer part 4 Corrugator belt 5 Single-sided cardboard 6 Liner paper 7 Hot plate 8 Ballast roll 9 Cardboard sheet

Claims (8)

In the multi-woven corrugator belt in which two outermost layers exposed on the front and back sides and an intermediate layer sandwiched between the two outermost layers are arranged and the two outermost layers and the intermediate layer are bonded to each other by a binding warp,
Cotton on one outermost warp,
In the other outermost warp, a blended yarn of polyester fiber and rayon fiber, or a blended yarn of polyester fiber and cotton,
Polyfilament yarn of polyester fiber for the warp of the intermediate layer,
Using either polyester fiber alone or polyester fiber and cotton twisted yarn for the weft,
The structure is either triple or quadruple,
A corrugator belt characterized in that a structure of 2/2 broken twill, 1/3 broken twill or 3/1 broken twill is selected for each of the one outermost layer and the other outermost layer. The corrugator belt according to claim 1, wherein the warp of the intermediate layer is a warp entangled with the weft of the intermediate layer in a plain weave structure and / or a core yarn not entangled with any of the wefts. The cotton yarn used for the warp of the one outermost layer has a cotton count of one warp of 0.2 to 1.0 S and a weave density of 15 to 55 / 2.54 cm. The corrugator belt according to any one of 2 above. In the blended yarn of polyester fiber and rayon fiber or the blended yarn of polyester fiber and cotton used for the warp of the other outermost layer, the cotton count of one warp is 0.2 to 1.0 S, and the weave density is 15 to The corrugator belt according to any one of claims 1 to 3, wherein the ratio is 55 / 2.54 cm, and the blend ratio of the polyester fiber and the rayon fiber or cotton is 65:35 to 55:45 by weight ratio. The corrugator belt according to any one of claims 1 to 4, wherein a woven density of all warps of the corrugator belt is 60 to 220 yarns / 2.54 cm. In the weft of either the polyester fiber used alone or the twisted yarn of cotton and polyester fiber, the weft of one weft is 0.1 to 1.0 S, and the mixing ratio of cotton and polyester fiber is The corrugator belt according to any one of claims 1 to 5, wherein 0: 100 to 80:20. The bonding warp binds one of one outermost layer and each intermediate layer and one of the other outermost layer and each intermediate layer, and does not penetrate the cross section of the corrugator belt. The corrugator belt according to any one of 1 to 6. The portion including both ears excluding the central portion in the width direction of the corrugator belt, the warp of the one outermost layer is replaced with cotton yarn, and twisted yarn of cotton and polyester fiber is used. The corrugator belt according to any one of 7 above.