JPH0784248B2 - Corrugator belt - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to a corrugator belt used in a corrugator machine for producing corrugated cardboard sheets.

2. Description of the Related Art As shown in FIG. 3, a heating part (1) and a cooling part (2) are used to manufacture a corrugated board by pressure-bonding a single-sided corrugated board coated with an adhesive with a liner paper with a glue machine. In the double facer section (3) of the corrugator machine, the corrugator belt (4), which is formed by endlessly joining thick woven cloth or needle punch felt, is arranged as a corrugated sheet conveying means. The single-sided corrugated paper (5) and the liner paper (6) coated with an adhesive such as starch paste with a glue machine are supplied to the double facer section (3) while being pressed against each other by the corrugator belt (4), and then heated ( The corrugator belt (4) and the ballast roll (8) are heated and heated by 7) to be dried and adhered to each other to form a corrugated cardboard sheet (9) having a predetermined thickness. After passing through the cooling part (2), the corrugated board sheet (9) is conveyed to a cutter (not shown) and taken out as a product cut into a predetermined size.

The heating part (1), when the single-faced corrugated paper (5) and the liner paper (6) carried by the corrugator belt (4) pass over the horizontally held hot plate (7),
A plurality of ballast rolls (8) can be freely rotated above the hot plate arranging area along the conveyance direction of the corrugated board sheet in order to apply a uniform pressing force over the entire length of the corrugated board sheet (9) in the width direction. Support. On the other hand, the cooling part (2) is installed for the purpose of reducing the time-dependent warpage of the corrugated board sheet by lowering the temperature of the corrugated board sheet (9) heated by the heating part (1).

The corrugator belt (4) used as a conveying member for the corrugated cardboard sheet (9) in the heating part (1) and the cooling part (2) maintains the functions described so far at a level satisfying its use. Therefore, it is required to have the following characteristics. That is,
The corrugator belt (4) is for durability against heat, smoothness for improving adhesion to the corrugated cardboard sheet (9), and for evenly transmitting pressure force transmitted from the ballast roll (8) to the corrugated cardboard sheet (9). Maintaining a certain level of appropriate thickness and rigidity, electrothermal property for promoting the drying function and uniformizing the dry state, and running property for stabilizing the transport position of the corrugated cardboard sheet (9). is necessary.

As the corrugator belt (4) capable of satisfying these conditions, a cotton belt having a multi-woven structure as illustrated in FIGS. 4 to 5 and a needle belt having a laminated structure as illustrated in FIG. 6 are used. ing.

Problems to be Solved by the Invention However, the corrugator belt (4) still has some problems left unsolved due to its considerably large thickness.

The problem in Fig. 1 is the deterioration of quality due to the generation of joint marks. As shown in FIG. 7, the corrugator belt (4) is formed by attaching large hooks (10) to both ends of a sheet-shaped base material by an appropriate fixing means such as piercing pressure bonding and abutting the hooks. The core wire (11) is inserted into the common hole to be joined endlessly. At this time, a joint mark may be generated on the surface of the corrugated cardboard sheet (9) due to the pressing of the hook (10) or the core wire (11). A soft cloth may be adhered to the surface of the joint portion as the cloth (12) In the corrugator belt (4) having such joint structure, the corrugator belt serving as the end of the hook (10) is attached. A part of the corrugator belt is scraped off so that the total thickness of the edge portion of (4) and the hook (10) is the same as the thickness of the main body of the corrugator belt (4) other than the joint forming portion. It is necessary to take measures to prevent the occurrence of steps such as adjusting the number of yarns arranged.

However, even if the static thickness of the corrugator belt (4) is made substantially the same over the entire area of the paper contact surface by such a method, it is a practical problem to make the joint forming portion and the other portions have the same rigidity. Not easy. Therefore, when the thin E-type flute is adhered to the liner paper or the like, a dent is often generated on the surface of the corrugated cardboard sheet (9) pressed by the joint forming portion. With the recent advances in printing technology, demands for improvement of paper quality are becoming more and more sophisticated, and it is particularly demanded to establish measures for preventing the occurrence of the above-mentioned joint mark for high-grade corrugated board sheets.

The second problem is the occurrence of curling with time. The single-sided corrugated paper (5) and the liner paper (6) are generally joined by an adhesive, but a mixture of starch and water is often used as the adhesive for economic considerations. The heat energy required to gelatinize the starch-based adhesive is usually supplied from a plurality of hot plates (7) maintained at a temperature of 150 ° C to 180 ° C. The known cotton corrugator belt (4) absorbs the evaporated water from the corrugated cardboard sheet (9) and evaporates the water retained in the woven structure by the capillary phenomenon from the surface of the corrugator belt (4). Circulate the heating part (1). However, the corrugator machine is not provided with an active drying device for the corrugator belt (4), so that the thick corrugator belt (4) is kept in a wet state during circulation running. As a result, the uniform drying of the corrugated board sheet (9) is hindered, and the upper surface of the corrugated board sheet (9) tends to be humid as compared with the lower surface. In order to eliminate such inconvenience, the corrugated cardboard sheet (9) is made so that the adhesive containing starch as a main component can be gelatinized.
The heating temperature of the outer liner paper, which is a component of the above, must be maintained at a high temperature, which increases the warp of the corrugated cardboard sheet (9). This increase in warpage hinders the workability of automatic stacking of corrugated board sheets (9) cut by a cutter at the end of the corrugator machine.
As a result, manual inversion stacking work is inevitable,
The automatic operation and omission of the corrugator machine will be hindered.

The third problem is insufficient durability of the corrugator belt (4). The known cotton belt corrugator belt (4) is a thick woven fabric having a multiple weave structure and has a relatively long aspect period, but is suitable for a fragile ear part to increase its overall strength. In many cases, there are many reinforcement measures. However, when used for a long time,
The thickness of the corrugator belt may be slightly different between the center portion and the both end ears despite the adoption of the reinforcing means. As a result, the pressing force of the corrugator belt (4) on the corrugated cardboard sheet (9) becomes non-uniform, and adhesion failure occurs between the single-sided corrugated paper (5) and the liner paper (6).

A main object of the present invention is to provide a corrugator belt having a unique yarn structure and a multi-woven structure capable of eliminating the above-described disadvantages found in conventional corrugator belts.

Means for Solving the Problems In view of such an object, the present invention uses a large diameter synthetic fiber monofilament yarn for the warp (20) to form the wefts (30) and (40) constituting the surface layer and the intermediate layer. A gist is a corrugator belt consisting of large-diameter synthetic filament monofilament yarn and multiple weave fabric (60) that uses twisted or aligned yarn of synthetic bulky bulky spun yarn for weft yarn (50) that constitutes the back layer. To do.

EXAMPLE FIG. 1 and FIG. 2 are longitudinal sectional views illustrating the structure of a corrugator belt according to the present invention. As shown in these drawings, the corrugator belt has a warp (20) made of large-diameter synthetic fiber monofilament yarn and a weft (30) (30), which is made of large-diameter synthetic fiber monofilament yarn, for forming a surface layer and an intermediate layer. 40) and a weft yarn (50) for forming the backing layer, which consists of a twisted or aligned yarn of thick bulky spun yarn of synthetic fiber. By weaving these yarns into a multi-woven structure, conventional cotton belts and needles are obtained. The corrugated paperboard sheet (9) is lighter than the belt and has a high air permeability. The edge of the corrugator belt has a certain number of wefts (3
The loops (L) for inserting the core wire are formed by pulling out 0), (40) and (50) over the entire width and folding back the warp threads (20) remaining at the edge portions.

The illustrated corrugator belt is finished according to the specifications as shown in Table 1 below. In Table 1,
TM indicates polyester monofilament yarn, T indicates polyester multifilament yarn or spun yarn, AC indicates acrylic spun yarn, C indicates cotton spun yarn, and N indicates nylon multifilament yarn. The numbers next to the TM are
1 shows the minor axis (mm) and major axis (mm) or diameter (mm) of a polyester monofilament yarn having a flat cross section.
Further, the yarn composition is shown as /, the twisted yarn is shown, and the aligned yarn is shown.

The rigidity in the weft direction shown in Table 1 above was measured by the following measuring method. A corrugator belt was cut to prepare a sample with a length of 200 mm and a width of 30 mm, and the distance between branches was maintained at 100 mm on a support table of both ends supporting beam type attached to an Instron tensile tester (model 1123 type) Install. In this state, a tensile load is applied to the center of the sample by a tensile rod connected to the load cell of the Instron tensile tester. At this time, increase the pulling speed of the pull rod to 10
While maintaining 0 mm / min, the bending stress is measured while causing bending deformation of the sample due to the tensile load, and the magnitude of the tensile load corresponding to the maximum bending stress is taken as the rigidity of the sample.

Although the embodiments of the present invention have been described above based on the two embodiments, the scope of rights of the present invention should not be limitedly interpreted by the description of such embodiments, and the following application examples are given. Can be included. That is, the present invention relates to (a) an embodiment in which a monofilament yarn of a synthetic fiber having a flat cross section in the warp and having its major axis oriented in the width direction of the corrugator belt is used.

(B) An embodiment in which a highly rigid synthetic filament monofilament yarn having a thickness twice or more that of the warp in terms of cross section is used as the weft yarns constituting the surface layer and the intermediate layer.

(C) An embodiment in which warp yarns are extended from both ends of the corrugator belt to form loops for folding joints.

(D) An embodiment in which the thickness of the corrugator belt having a multi-fold structure is maintained at 3.0 mm to 6.0 mm.

(E) The air permeability measured according to the Frazier method is 50
Embodiments of maintaining at 15,000 cc / min / cm ² within 00 cc / min / cm ² can be included.

EFFECTS OF THE INVENTION As can be understood from the above illustrative description, the corrugator belt according to the present invention has durability, dryness, and
It is possible to exert a remarkable effect on the improvement of the air permeability and the smoothness of the corrugated board sheet.

The advantages of the present invention will be listed below in more detail. The first advantage is that the corrugator belt is made of monofilament yarn of synthetic fiber, which is superior in heat resistance and thermal stability to cotton yarn, so that high durability, dimensional stability and running stability can be obtained. The second advantage is
Since the monofilament yarn of the synthetic fiber having the flat cross section is used for the warp, the smoothness of the contact surface with the corrugated board sheet is improved. By strongly pressing the corrugated cardboard sheet introduced in the double facer part to this smooth surface, the adhesion between the corrugated cardboard sheet and the hot plate is improved, the strength and surface characteristics of the product are improved, and further, the drying conditions with excellent energy saving properties are improved. Is obtained. The third advantage is that the corrugator belt is made of synthetic fabric with a high air permeability, and has a high moisture evaporation capacity, which is superior to that of the conventional cotton fiber corrugated belt. The drying speed can be improved by 10 to 15%. Therefore, an economical drying means having an excellent energy saving effect is provided. A fourth advantage is that the warp yarn is extended from both ends of the corrugator belt and folded back to form a joint loop, so that an extremely compact main body portion and a joint having a small difference can be obtained. Therefore, it is possible to prevent the occurrence of dents due to the joint forming portion being strongly pressed against the corrugated board-sheet,
The surface smoothness of the corrugated board sheet is significantly improved. A fifth advantage is that it is possible to prevent warpage over time. That is, since the evaporation rate of moisture can be increased by using the corrugator belt according to the present invention, the difference in moisture content between the front and back surfaces of the corrugated board sheet is reduced. Thus, there is substantially no warpage over time due to the difference in water content, and a stable stacked state can be maintained without alternately inverting the front and back when stacking cut corrugated cardboard sheets. That is, by using the corrugator belt according to the present invention, not only the labor-saving effect and the energy-saving effect are achieved, but also the deterioration of the quality of the corrugated board sheet due to excessive drying can be effectively avoided. As a sixth advantage, a twisted yarn or a drawn yarn of a bulky bulky yarn of synthetic fiber is used as a weft yarn constituting the back layer of the corrugator belt,
Since the "lodge" of the ballast roll is absorbed by utilizing the cushioning property of the bulky spun yarn, the pressure applied from the ballast roll to the corrugated cardboard sheet becomes uniform. For this reason, there is no adhesion failure between the single-faced corrugated paper and the liner paper due to the uneven pressure. A seventh advantage is that, as a weft yarn constituting the surface layer and the intermediate layer of the corrugator belt, a highly rigid synthetic fiber monofilament yarn having a thickness (cross-sectional area) more than twice that of the warp yarn is used, and the rigidity in the width direction of the corrugator belt is used. As well as absorbing the ballast roll "odori" by improving the,
By making the pressing force uniform, it is possible to eliminate the crushing of the corrugated cardboard sheets at both ends of the wide cloth and the poor bonding of the central portion. Thus, it is possible to form the double facer portion on the entire surface of the corrugated board sheet, on which the uniform pressing force acts.
An eighth advantage is that since the corrugator belt is formed of synthetic fiber yarn and has a low unit weight, the total weight of the corrugator belt is reduced, and the corrugator belt is easy to put in and the noise during operation is also reduced. As a ninth advantage, since the monofilament yarn of synthetic fiber is used for the weft yarn and the warp yarn on the paper-contacting surface, stains are reduced and even if a stain substance is attached, it can be easily washed off. Therefore, it is possible to provide a corrugator belt which is suitable for long-term continuous operation and has little dirt.

[Brief description of drawings]

FIG. 1 and FIG. 2 are views showing a structure of a corrugator belt according to the present invention and a longitudinal section of a joint portion thereof. FIG. 3 is a front view illustrating the structure of the double facer portion of the corrugator machine, and FIGS. 4 to 6 are organization charts illustrating the structures of known cotton belts and needle belts. Further, FIG. 7 is a partial cross-sectional front view illustrating the structure of the hook attached to the joining end of the corrugator belt. (20) …… Warp, (30) (40) (50) …… Weft, (60)
...... Multiple woven fabric.

Claims (6)

[Claims] 1. A large-diameter synthetic filament monofilament yarn is used as a warp, a large-diameter synthetic-fiber monofilament yarn is used as a weft yarn constituting a surface layer and an intermediate layer, and a large bulkiness of synthetic fibers is used as a weft yarn constituting a back layer. Corrugator belt made of multiple fabrics using twisted yarns or drawn yarns of spun yarns. 2. The corrugator belt according to claim 1, wherein the warp comprises a monofilament yarn of synthetic fiber having a flat cross section. 3. A corrugator belt according to claim 1, wherein a synthetic fiber monofilament yarn having a thickness that is at least twice as large as a warp yarn is used as a weft yarn constituting the surface layer and the intermediate layer. 4. The corrugator belt according to claim 1, wherein warp yarns are extended from both ends of the corrugator belt to form loops for folding joints. 5. The corrugator belt according to claim 1, wherein the corrugator belt having a multi-woven structure has a thickness of 3.0 mm to 6.0 mm. 6. Frazier corrugator belt according to paragraph 1 range of permeability was measured in compliance 5000cc / min / cm ² to claims is 15000cc / min / cm ² in criminal law.