WO2016072251A1

WO2016072251A1 - Flat belt

Info

Publication number: WO2016072251A1
Application number: PCT/JP2015/079554
Authority: WO
Inventors: 佑紀佐藤; 小野　充昭; 暁彦栗谷; 秀久川村
Original assignee: ニッタ株式会社
Priority date: 2014-11-04
Filing date: 2015-10-20
Publication date: 2016-05-12
Also published as: JP2016088681A

Abstract

Provided is a flat belt characterized by comprising: a core canvas (12); a first resin layer (14a) and a first outer canvas (16a) which have been successively laminated to one surface (12a) of the core canvas (12); a first rubber layer (18a) laminated to the first outer canvas (16a) with an adhesive; a second resin layer (14b) and a second outer canvas (16b) which have been successively laminated to the other surface (12b) of the core canvas (12); and a second rubber layer (18b) laminated to the second outer canvas (16b) with an adhesive. The flat belt is further characterized in that the sum of the thickness of the first rubber layer (18a) and the thickness of the second rubber layer (18b) is 15-65% of the overall thickness. The flat belt combines high wear resistance with high flexing resistance and has excellent lateral rigidity.

Description

Flat belt

The present invention relates to a flat belt, and more particularly to a flat belt used for a confectionery box forming machine.

Conventionally, a nylon film type flat belt is used as a belt for a confectionery box forming machine (folder gluer). Recently, a flat belt having a total of nine layers in which an inner resin layer, a woven fabric, an outer resin layer, and a surface friction layer are sequentially laminated on both sides of a woven fabric core has been proposed (see Patent Document 1). Wear resistance can be ensured by providing a surface friction layer having an appropriate thickness.

By the way, when used in the folder gluer, the flat belt is used by joining both end portions formed in a predetermined shape integrally to form an endless shape. As joints (that is, joint portions) at both ends of the flat belt, there are a sky bar joint using an adhesive and a finger joint by heat fusion, but the finger joint is advantageous in terms of the hardness and life of the joint. It is said that there is.

Japanese Patent No. 4671742

In order to ensure sufficient wear resistance, the surface friction layer of the flat belt is desired to be thick, but when the surface friction layer becomes thick, the adhesion to the lower layer is lowered. A surface friction layer with insufficient adhesion may be lifted by bending. In particular, in the case of a flat belt formed in an endless shape, the influence of bending is large in the joint portion, and the lift of the thick surface friction layer becomes remarkable in the finger joint portion. At present, a flat belt having both high wear resistance and high bending resistance has not yet been obtained.

Further, in the folder gluer, for example, a flat belt that engages with the paperboard in order to bend the paperboard may be configured to twist 90 ° around the longitudinal axis. The folder gluer belt is required to have excellent lateral rigidity in addition to wear resistance and bending resistance.

Therefore, an object of the present invention is to provide a flat belt that has both high wear resistance and high bending resistance and is excellent in lateral rigidity.

The flat belt according to the present invention includes a core canvas, a first resin layer and a first outer canvas sequentially stacked on one surface of the core canvas, and an adhesive layered on the first outer canvas. The first rubber layer formed, the second resin layer and the second outer canvas sequentially laminated on the other surface of the core canvas, and the second laminated with an adhesive on the second outer canvas. The thickness of the first rubber layer and the thickness of the second rubber layer is 15 to 65% of the thickness of the main body of the flat belt.

According to the present invention, in the flat belt, the first rubber layer is laminated on the first outer canvas, and the first outer canvas is laminated on the first resin layer. And the first resin layer can be made higher in adhesive strength than in the prior art. In addition, the second rubber layer is laminated on the second outer canvas, and the second outer canvas is laminated on the second resin layer, so that the second rubber layer and the second resin layer are separated from each other. The adhesive force can be increased as compared with the conventional case. This makes it possible to prevent the first and second rubber layers from floating due to bending even with a flat belt having a large thickness of the first and second rubber layers. A flat belt having flexibility is obtained.

Further, by setting the total thickness of the first rubber layer and the second rubber layer to 15 to 65% of the thickness of the main body of the flat belt, high wear resistance is imparted to the flat belt.

Moreover, the flat belt can be improved in lateral rigidity and lateral hardness by providing the core body with canvas and providing the first and second outer canvases and providing three layers of canvases. .

It is a longitudinal cross-sectional view which shows the structure of the flat belt which concerns on this embodiment. It is a schematic perspective view which shows the finger joint part of the flat belt which concerns on one Embodiment of this invention, FIG. 2A shows the edge part of the flat belt before joining, FIG. 2B shows the joint part after joining. It is a schematic explanatory drawing which shows the state of the flat belt at the time of folding a paperboard in folder gluer. It is the schematic which shows the bending resistance test in an Example. It is a mimetic diagram showing a twist endurance running test machine. It is a schematic explanatory drawing which shows the flange rubbing endurance running test in an Example, FIG. 6A shows a side view, FIG. 6B shows a top view.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. A core canvas 12 is arranged in the center portion in the thickness direction of the flat belt 10 shown in FIG. A first resin layer 14 a, a first outer canvas 16 a, and a first rubber layer 18 a are sequentially provided on one surface 12 a of the core canvas 12, and a second resin 12 a is provided on the other surface 12 b of the core canvas 12. A resin layer 14b, a second outer canvas 16b, and a second rubber layer 18b are sequentially provided.

The material of the core canvas 12 can be selected from polyester fiber and nylon fiber. Examples of the polyester fiber include polyethylene terephthalate (PET) fiber and polybutylene terephthalate fiber. Examples of the nylon fiber include nylon 6 fiber and nylon 66 fiber. In particular, PET fiber is preferable as the material of the core canvas 12. The thickness of the core canvas 12 is not particularly limited, but is usually preferably about 0.4 to 0.6 mm, and more preferably about 0.45 to 0.55 mm.

The first and

second resin layers

14a and 14b are formed using a thermoplastic elastomer and impart adhesiveness and flexibility to the flat belt 10. Examples of the thermoplastic elastomer include thermoplastic polyurethane elastomers and polyester elastomers, and thermoplastic polyurethane elastomers are preferred because they are more excellent in flexibility and flexibility. The thickness of each of the first and

second resin layers

14a and 14b is not particularly limited, and is usually preferably about 0.4 to 1.0 mm, more preferably about 0.5 to 0.6 mm. preferable.

The first and second

outer canvases

16a and 16b impregnated with an adhesive are laminated on the first and

second resin layers

14a and 14b, respectively. As the material of the

outer canvas

16a, 16b, the same material as that of the core canvas 12 can be used, but nylon fiber may be used. The thickness of each of the first and second

outer canvases

16a and 16b is not particularly limited, but is usually preferably about 0.3 to 0.6 mm, more preferably about 0.4 to 0.5 mm. preferable. As the adhesive impregnated in the first and second

outer canvases

16a and 16b, for example, a polyurethane-based adhesive can be used.

The first outer canvas 16a is well bonded to the first resin layer 14a by the adhesive impregnated in the first outer canvas 16a, and the second outer canvas 16b is bonded to the second outer canvas 16b by the adhesive impregnated in the second outer canvas 16a. The outer canvas 16b is well bonded to the second resin layer 14b.

The first and

second rubber layers

18a and 18b are laminated on the first and second

outer canvases

16a and 16b via an adhesive, respectively. The first and

second rubber layers

18a and 18b are surface friction layers that are subjected to friction with the paperboard when the paperboard is bent in the folder gluer. The first and

second rubber layers

18a and 18b can be formed of, for example, nitrile butadiene rubber (NBR) or NBR rubberized cloth, but it is preferable to use sulfur vulcanized rubber in consideration of bending resistance. .

It is desirable that the material of the first and

second rubber layers

18a and 18b conforms to FDA (American Food and Drug Administration) standards or the Food Sanitation Law.

For adhesion of the first and

second rubber layers

18a and 18b, for example, a conductive adhesive-containing rubber adhesive is used. A rubber-type adhesive agent is not specifically limited, For example, a urethane type, a phenol type, etc. are mentioned. Examples of the conductivity-imparting agent include carbon-based conductivity imparting agents such as carbon black, graphite, and carbon fiber, and metal-based conductivity imparting agents such as various metal fine powders (copper, iron, aluminum, etc.). Is mentioned. Antistatic performance can be imparted to the flat belt by using an adhesive containing a conductivity imparting agent.

On the adhesive surface between the first outer canvas 16a and the first rubber layer 18a and the adhesive surface between the second outer canvas 16b and the second rubber layer 18b, the adhesive is the first and second outer canvas 18a. , 18b. Thus, the first rubber layer 18a is well bonded to the first outer canvas 16a, and the second rubber layer 18b is bonded well to the second outer canvas 16b.

As described above, the first outer canvas 16a is favorably bonded to the first resin layer 14a, and the second outer canvas 16b is favorably adhered to the second resin layer 14b. The presence of the first outer canvas 16a enhances the adhesion between the first rubber layer 18a and the first resin layer 14a, and the presence of the second outer canvas 16b increases the second rubber layer 18b and the second rubber layer 18b. Adhesiveness with the resin layer 14b is improved. As a result, even when the thickness of the first and second rubber layers 18a and 18b is large, it is possible to prevent lifting due to bending.

When the thickness from the surface of the first rubber layer 18a to the surface of the second rubber layer 18b is the main body thickness of the flat belt 10, for example, in the case of the flat belt 10 having a main body thickness of 3 mm, Even if the total thickness of the second rubber layers 18a and 18b is about 0.6 mm, the rubber layers 18a and 18b can be prevented from being lifted. In the case of the flat belt 10 having a main body thickness of 4 mm, the rubber layers 18a and 18b are prevented from being lifted even when the total thickness of the first and second rubber layers 18a and 18b is about 1.6 mm. be able to. In the flat belt 10 of the present embodiment, the total thickness of the first and second rubber layers 18a and 18b can be about 15 to 65% of the main body thickness. By making the sum of the thickness of the first rubber layer 18a and the thickness of the second rubber layer 18b 15% or more of the thickness of the main body of the flat belt, desired wear resistance can be imparted to the flat belt. it can. Moreover, if the sum of the thickness of the first rubber layer 18a and the thickness of the second rubber layer 18b is 65% or less of the thickness of the main body of the flat belt, characteristics required for the flat belt will be impaired. There is no.

Incidentally, as the number of layers constituting the flat belt 10 increases, the ratio of the first and second rubber layers 18a and 18b tends to decrease, and the manufacturing cost increases. For example, in the case of the conventional nine-layer configuration (main body thickness: 5.5 mm), the total of the first and second rubber layers 18a and 18b accounts for about 13% of the main body thickness at the maximum.

In addition, in order to ensure the durability and wear resistance required for the folder gluer belt, the thickness of each of the first and second rubber layers 18a and 18b is desirably at least 0.5 mm or more.

Such a flat belt 10 can be manufactured, for example, as follows. First, an adhesive is applied to both surfaces of the core canvas 12 formed into a belt shape by coating or dipping. The first and second resin layers 14a and 14b are laminated on both sides of the core canvas 12 to which the adhesive is applied by extrusion lamination. On the first and second resin layers 14a and 14b, first and second

outer canvases

16a and 16b impregnated with an adhesive are laminated and adhered, respectively. Further, the belt-like flat belt 10 is obtained by laminating and bonding the first and second rubber layers 18a and 18b formed in a band shape on the first and second

outer canvases

16a and 16b, respectively.

For example, a polyurethane adhesive is used for bonding the core canvas 12 and the first resin layer 14a and bonding the core canvas 12 and the second resin layer 14b. For example, a polyurethane-based adhesive is used for bonding the first resin layer 14a and the first outer canvas 16a and bonding the second resin layer 14b and the second outer canvas 16b. In addition, for adhesion between the first outer canvas 16a and the first rubber layer 18a and adhesion between the second outer canvas 16b and the second rubber layer 18b, the conductivity-containing agent-containing rubber system as described above is used. An adhesive is used.

The main body thickness of the flat belt 10 of this embodiment can be about 2.5 to 6 mm. As described above, in the flat belt 10 of the present embodiment, since the ratio of the first and second rubber layers 18a and 18b in the thickness direction can be increased, the main body thickness of the flat belt 10 is reduced. However, the thickness of the first and second rubber layers 18a and 18b itself has little influence. Even if the thickness of the main body is 4 mm or less, the flat belt 10 of the present embodiment can ensure desired wear resistance and bending resistance.

The belt-like flat belt thus obtained can be made endless by the following method. That is, first, as shown in FIG. 2A, the

end portions

21 and 21 of the flat belt 10 are punched into a saw blade shape. The ends 21 and 21 are cut into finger shapes complementary to each other. Next, as shown in FIG. 2B, after the

end portions

21 and 21 are engaged with each other, the first and second resin layers 14a and 14b are heated to a temperature at which the fluid flows, and heat is applied while applying a predetermined pressure. Bonded together by fusion. The applied pressure can be, for example, about 0.1 to 0.2 MPa per 20 mm width of the flat belt 10. After heat sealing, the endless flat belt 25 having the finger joint portions 22 is obtained by cooling at a predetermined temperature. 2B corresponds to the cross-sectional view of FIG.

When making the flat belt 10 of the present embodiment endless, both ends of the belt may be processed into a taper shape, the taper surfaces may be bonded together with an adhesive, and seamed by a sky bar joint.

In the flat belt 10 of this embodiment, the first and second rubber layers 18a and 18b are laminated and bonded to the first and second

outer canvases

16a and 16b, and the first and second

outer canvases

16a and 16b. Are laminated and bonded to the first and second resin layers 14a and 14b. Due to the presence of the first outer canvas 16a, the first rubber layer 18a is well bonded to the first resin layer 14a, and due to the presence of the second outer canvas 16b, the second rubber layer 18b becomes the second resin. Since it is well bonded to the layer 14b, the lift of the rubber layers 18a and 18b due to bending is reduced. Even when the total thickness of the first and second rubber layers 18a and 18b is about 15 to 65% of the thickness of the main body of the flat belt, the rubber layers 18a and 18b are well bonded to the resin layers 14a and 14b. The When the flat belt 10 is endless, the rubber layers 18a and 18b are not lifted at the finger joints. The flat belt 10 of the present embodiment has wear resistance and bending resistance.

In addition, the flat belt of the present embodiment has a core body made of canvas and is provided with first and second outer canvases, and is provided with a total of three layers of canvases. Is increased. When a paper box is manufactured by twisting the endless flat belt 25 in the folder gluer 30 as shown in FIG. Stiffness is also improved.

Hereinafter, the flat belt of the present invention will be described in detail with reference to examples, but the present invention is not limited to the following examples.

<Production of flat belt>
The flat belt of the example was manufactured using the first and second rubber layers, the first and second outer canvases, the first and second resin layers, and the core canvas in the combinations shown in Table 1 below. In Table 1 below, NBR is an abbreviation for acrylonitrile-butadiene rubber, and TPU is an abbreviation for thermoplastic polyurethane.

First, an adhesive was applied to both sides of the core canvas formed into a belt shape by coating. After laminating the resin layer on both sides of the core canvas coated with the adhesive by extrusion lamination, the outer canvas was laminated and adhered onto the resin layer. The outer canvas is pre-impregnated with a TPU adhesive. Further, the rubber layer formed into a belt shape was laminated and adhered onto the outer canvas using a conductive adhesive-containing rubber adhesive to obtain a belt-like flat belt of an example having a seven-layer structure. Table 1 below summarizes the configuration of the flat belt of the example and the pulley diameter of the driven pulley used in the bending resistance test.

As a comparative example, a flat belt having the structure shown in Table 2 below was prepared. Table 2 below summarizes the configuration of the flat belt of the comparative example and the pulley diameter of the driven pulley used in the bending resistance test.

As shown in Table 1 above, the flat belt of the example includes a three-layered canvas including a core canvas and first and second outer canvases. In the flat belt of the embodiment, both surface layers are composed of rubber layers, and these rubber layers are laminated and bonded to the outer canvas.

Table 1 shows that the total thickness of the first and second rubber layers is about 15 to 65% of the thickness of the main body in the flat belt of the example.

On the other hand, the canvas included in the flat belt of the comparative example is only one layer.

<Evaluation>
Each of the belt-like flat belts obtained above was made endless. First, both ends of the belt main body were punched into a saw blade shape. Next, after engaging both ends, they were heated to a predetermined temperature and joined together by heat fusion to obtain an endless flat belt having finger joint portions.

In addition, the formation conditions of a joint part are as follows, respectively.
Example: 0.2 MPa / 20 mmW, held at 185 ° C. for 1 minute → 40 ° C. cooling Comparative example: 0.1 MPa / 20 mmW, held at 155 ° C. for 1 minute → 40 ° C. cooling

Next, the endless flat belts of Examples and Comparative Examples were evaluated for bending resistance and belt lateral rigidity.

[Flexibility]
As shown in FIG. 4, the endless flat belt 25 was wound around the drive pulley 41, the first driven pulley 42a, the second driven pulley 42b, and the third driven pulley 42c. The pulley diameter of the drive pulley 41 was 100 mm. The pulley diameters of the three driven

pulleys

42a, 42b, and 42c were 40 mm for Example 1, and 50 mm for Example 2 and the comparative example.

The following test for bending resistance was conducted with an attachment elongation rate of 1% (200 mm marked line). The drive pulley 41 was rotated along a direction away from the drive pulley 41 (in the direction of arrow A in FIG. 4) with a constant load acting on the driven

pulleys

42a, 42b, and 42c. The number of bendings until the endless flat belt 25 was broken at a belt speed of 700 m / min was measured, and the state of the joint portion was visually observed. The results are summarized in Table 3 below.

It can be seen that the flat belt of the example has better bending resistance than the flat belt of the comparative example.

[Belt lateral stiffness: Twisted running]
Each endless flat belt was twisted and run as described below, and a twist durability running test was conducted.

The twist durability running test uses a torsion durability running test machine 50 including one drive pulley 51 and a driven pulley 52 as shown in FIG. The endless flat belt 25 is twisted 180 degrees between the driving pulley 52 and the driven pulley 52 and is twisted 180 degrees between the driven pulley 52 and the driving pulley 51, and is wound around the driving pulley 51 and the driven pulley 52. ing. The diameters of the driving pulley 51 and the driven pulley 52 were 100 mm. The endless flat belt 25 has a belt attachment elongation rate of 1% and a traveling speed of 700 m / min. The endless flat belt 25 is allowed to run until an abnormality occurs. Since this torsional durability running test machine 50 is provided with two pulleys including the driving pulley 51 and the driven pulley 52, the endless flat belt 25 is bent twice in one turn.

After 672 hours had passed, the appearance of the joints in each flat belt was visually observed, and no abnormalities were confirmed in the examples. On the other hand, with respect to the flat belt of the comparative example, occurrence of cracks was observed at the finger tips.

[Belt lateral rigidity: Flange rubbing running]
An endless flat belt was run by rubbing the flange as follows, and a flange rubbing endurance running test was conducted.

In the flange rubbing durability running test, as shown in FIGS. 6A and 6B, a flange rubbing durability running test machine 60 provided with a drive pulley 61 and a driven pulley 62 arranged horizontally is used. The endless flat belt 25 is wound around a drive pulley 61 and a driven pulley 62. The diameters of the driving pulley 61 and the driven pulley 62 were 100 mm. As shown in FIG. 6A, the drive pulley 61 was misaligned by being disposed in a state inclined by 0.96 degrees with respect to the longitudinal direction of the flat belt. On one side of the drive pulley 61 and the driven pulley 62, a flange 63 was provided. The height of the flange 63 was 4 mm.

The extension elongation rate of the endless flat belt 25 is 1%, and the driving pulley 61 and the driven pulley 62 are rotated in the direction of arrow B in FIG. 6B, so that the endless flat belt 25 is rotated at a speed of 780 m / min. I drove it.

The flat belt of the example showed no abnormality in the finger joint even after 192 hours. On the other hand, the flat belt of the comparative example climbed on the flange after 3 minutes and was unable to run the test. Even if the test was repeated, a similar ride occurred and the test was interrupted. From this result, it can be seen that the flat belt of the example is superior in lateral rigidity to the flat belt of the comparative example.

The flat belt according to this embodiment can be expected to have the same degree of bending resistance as the current product (nylon film type).

(Modification)
The present invention is not limited to the above-described embodiment, and can be appropriately changed within the scope of the gist of the present invention.

10 flat belt 12 core canvas 12a one surface 12b other surface 14a first resin layer 14b second resin layer 16a first outer canvas 16b second outer canvas 18a first rubber layer 18b second rubber layer 21 End 22 Finger joint 25 Endless flat belt 30 Folder gluer 41 Drive pulley 42a First driven pulley 42b Second driven pulley 42c Third driven pulley 50 Belt twist endurance running test machine 51 Drive pulley 52 Drive pulley 60 Flange rub endurance test machine 61 Drive pulley 62 Driven pulley 63 Flange

Claims

Core canvas,
A first resin layer and a first outer canvas sequentially laminated on one surface of the core canvas;
A first rubber layer laminated with an adhesive on the first outer canvas;
A second resin layer and a second outer canvas sequentially laminated on the other surface of the core canvas;
A second rubber layer laminated with an adhesive on the second outer canvas,
A flat belt characterized in that the sum of the thickness of the first rubber layer and the thickness of the second rubber layer is 15 to 65% of the thickness of the main body.
The flat belt according to claim 1, wherein the first rubber layer and the second rubber layer are made of sulfur vulcanized rubber.
The flat belt according to claim 1, wherein the thickness of the main body is 2.5 mm or more.
2. The flat belt according to claim 1, wherein the adhesive is a conductive adhesive-containing rubber adhesive.
The flat belt according to claim 1, wherein both ends are joined by heat-sealing so as to be endless.