JP2010264699A - Tip split endless belt - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve durability of a chip splitting endless belt while preventing increase in production cost and deterioration in running property. <P>SOLUTION: A chip splitting endless belt 10 is formed by coating both sides of a fabric 11 with a surface material 12. The fabric 11 is formed by weaving first and second yarns 11a, 11b overstretching in first and second directions. A twisted yarn twisted 90 T/m in S twist is used as the first yarn 11a. The chip splitting endless belt 10 is formed so that the first yarn 11a may head for the chip splitting endless belt 10 in the longitudinal direction. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a chip split endless belt for dividing a chip such as a ceramic chip resistor into predetermined dimensions.

  In recent years, chip sizes such as ceramic chip resistors have been reduced to, for example, 0603 size or smaller. For this reason, when the dicer system which cut | disconnects a chip | tip with a cutter is used, productivity falls and the manufacturing cost of a chip | tip increases.

  Therefore, it is known to divide the chip thus miniaturized by passing it between a pair of upper and lower chip split endless belts. In order to improve the yield of chip splitting, it has been proposed to use a woven cloth for the core of the chip splitting endless belt (see Patent Document 1).

  The tip split endless belt is required to have good running performance. In order to obtain good running properties, it is conceivable to use a woven fabric (see Patent Document 2) in which the circumferential yarn of the woven fabric is a non-twisted yarn or an S-twisted yarn and a Z-twisted twisted yarn are arranged in the circumferential direction. It was.

  When non-twisted yarn is used, chip split endless belts tend to generate fluff from the side during use, and the side of the belt undulates, making it more durable than using woven fabrics with S-twisted and Z-twisted yarns. The sex was low. Further, when using a woven fabric having S-twisted and Z-twisted yarns, it is necessary to form the woven fabric using different twisted yarns, which complicates the manufacturing process of the woven fabric and increases the manufacturing cost. It was.

JP 2006-62141 A Japanese Utility Model Publication No. 02-124916

  Accordingly, an object of the present invention is to improve the durability of a tip split endless belt while preventing deterioration in running performance and an increase in manufacturing cost.

  The chip split endless belt of the present invention uses a woven fabric in which a twisted yarn twisted so as to have a twist number of 30 to 150 T / m in one of an S twist and a Z twist is oriented in the circumferential direction. It is characterized by providing.

  The twist number is preferably 90 T / m or less. Moreover, it is preferable that the number of twists is 60 T / m or more.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to improve durability, suppressing the increase in manufacturing cost by using as a core the twisted yarn extended in the circumferential direction and twisted in the same direction. Moreover, it is also possible to suppress the deterioration of runnability by limiting the number of twists.

It is a figure which illustrates roughly the division | segmentation method of the chip | tip with a chip | tip split endless belt. It is a lineblock diagram showing roughly composition of a chip division device using a chip split endless belt in this embodiment. It is a perspective view containing the cross section of the thickness direction of the chip | tip split endless belt in this embodiment. It is a schematic diagram of a running test machine.

  Embodiments of the present invention will be described below with reference to the drawings.

  The division of the chip using the chip split endless belt of the present embodiment will be described below. As shown in FIG. 1, the board | substrate 30 is first divided | segmented along one direction, and many row-shaped bodies 32 are formed. Next, each column 32 is further divided along a direction whose name is perpendicular to the hand direction, so that a large number of chips 34 are formed.

  As described above, the chip dividing device 40 is used in the step of dividing the board 30 to form the columnar body 32 and the step of dividing the columnar body 32 to form the chip 34 (see FIG. 2). For the chip dividing device 40, a pair of chip split endless belts are used.

  The first tip endless end belt 10a, which is one end tip split end belt, is wound around the first pulley 41 and the second pulley 42. The second tip endless belt 10b, which is the other tip endless belt, is wound around the first pulley 41 and the third pulley 43.

  The second pulley 42 is formed to have a larger diameter than the third pulley 43. The first tip split endless belt 10a is urged by the second pulley 42 to the second tip split endless belt 10b. The second tip split endless belt 10b is urged by the third pulley 43 to the first tip endless belt 10a. By urging the first and second tip split endless belts 10a and 10b, a bent portion 44 is formed in the first and second tip split endless belts 10a and 10b.

  The board 30 or the columnar body 32 is introduced into the gap S between the first and second chip split endless belts 10a and 10b. The board 30 or the row body 32 introduced into the gap S is pressed in the vertical direction at the bent portion 44 and divided into the row body 32 or the chip 34.

  Next, the configuration of the tip split endless belt will be described. As shown in FIG. 3, the chip split endless belt 10 is formed by covering both surfaces of a woven fabric 11 with a surface material 12.

  The woven fabric 11 includes a first yarn 11a extended in a first direction and a second yarn 11b extended in a second direction orthogonal to the first direction, with a thickness of 0.3 mm. It is formed by weaving to be as follows. As the first and second yarns 11a, for example, any one of aramid fiber, polyethylene terephthalate yarn, polyamide fiber, polyester fiber, glass fiber, and cotton yarn, or a combination thereof is used.

  As the first yarn 11a, a twisted yarn twisted in an S twist with a twist number of substantially 90 T / m is used. The woven fabric 11 is arranged so that the first yarn 11a faces the longitudinal direction of the tip split endless belt 10, and the tip split endless belt 10 is formed.

  The surface material 12 is formed of rubber or resin. For example, nitrile rubber, chloroprene rubber, polybutadiene rubber, ethylene propylene rubber, hydrogenated acrylonitrile butadiene rubber, styrene butadiene rubber, fluorine rubber, silicone rubber, natural rubber, millable urethane, polyurethane, polyamide, vinyl chloride, phenol resin, polyimide, polyester Any of fluororesins or a mixture of these is used.

  Next, the configuration of the present invention will be described more specifically.

  [Durability Test and its Evaluation] Using endless yarns and woven fabrics 11 in which the first yarn 11a is a twisted yarn having a twist number of 30, 90 T / m, a comparative endless belt, an example endless belt 1, And Example Endless belt 2 was manufactured. A durability test was performed using the endless belt of the comparative example, the endless belt 1 of the example, and the endless belt 2 of the example in the above-described chip dividing device 40.

  In the durability test, the columnar body 32 was divided using the chip splitting / dividing device 40 until the chip split endless belt 10 failed. It should be noted that the failure state of the tip endless endless belt 10 is defined when fluff is generated from the side surface of the endless tip endless belt 10 or when the surface of the endless tip endless belt undulates. Durability was evaluated by measuring the number of rows 32 divided until the chip endless belt 10 broke down as the life of the chip endless belt. The measurement results are shown in Table 1.

In Table 1 above, * 1 indicates the following items.
* 1 Ratio B / A of the number of columnar bodies divided by each endless belt to the number of columnar bodies divided by the comparative endless belt (A: number of columnar bodies divided by the comparative endless belt, B: endless The number of rows of belts divided by the belt).

  As can be seen from Table 1, it can be seen that the life of the tip split endless belt increases as the number of twists of the yarn used as the first yarn 11a increases. It can be seen that the durability is sufficiently improved even when a twisted yarn having a twist number of 30 T / m is used as compared with the case of using a non-twisted yarn. It can also be seen that the durability is further improved by using a twisted yarn having a twist number of 90 T / m. Therefore, it is estimated that durability increases as the number of twists increases.

  [Running Test and Evaluation] Examples Endless belts 1 to 4 were manufactured using a woven fabric 11 having a twisted yarn of 30, 60, 90, and 150 T / m as a first yarn 11a. Example Endless belts 1 to 4 were formed so that the width was 10 mm and the length of one circumference was 875 mm. Example The endless belts 1 to 4 were used in a runnability tester 50 as shown in FIG.

  The traveling tester 50 is composed of two crown pulleys 51a and 51b. One crown pulley 51a is rotatably supported. The other crown pulley 51b rotates at a rotation speed set by a motor (not shown). In addition, a crown pulley with a diameter of 20 mm, which was crowned to have a crown height / belt width of 0.13, 0.063, 0.042, 0.025, and 0.013, was used for the running test machine 50.

  The endless belts 1 to 4 of the example were wound around the crown pulleys 51a and 51b at an extension ratio of 1.0%, the crown pulley 51b was rotated, and the endless belts 1 to 4 of the example were run. After running for about 5 seconds, the running performance was evaluated by measuring the amount of deviation of the endless belts of the example endless belts 51a and 51b from the wrapping positions. The measurement results are shown in Table 2.

  As shown in Table 2, the endless belt was not biased when the crown height / belt width was in the range of 0.13 to 0.025. Further, even after running for about 5 seconds, stable running was maintained without causing any bias. Further, when the crown height / belt width was 0.013, the endless belts 2 to 3 of the example had a deviation of 0.5 mm, but the running was maintained without deviation to 0.5 mm or more in the following running. . In an endless belt having a width of 10 mm, a deviation of 0.5 mm is a range that does not cause a problem in running. Therefore, even if it uses the twisted yarn whose twist number is 60-150 T / m, it turns out that there is no problem in running property.

  According to the chip split endless belt of the present embodiment having the above-described configuration, while using the twisted yarn having a predetermined number of twists or less to achieve good running performance, either the S twisted yarn or the Z twisted yarn is used. Therefore, it is possible to prevent an increase in cost and improve durability.

  In the present embodiment, the first yarn 11a has a configuration in which a twisted yarn twisted in an S twist is used, but a configuration in which a twisted yarn twisted in a Z twist may be used. If a twisted yarn twisted in one of the S twist and the Z twist is used, the same effect as this embodiment can be obtained.

  In this embodiment, a woven fabric having a thickness of 0.3 mm or less is used, but the thickness of the woven fabric is not limited to 0.3 mm or less. Regardless of the thickness of the woven fabric, it is possible to obtain a highly durable chip split endless belt while maintaining good running performance and preventing an increase in cost. However, in order to obtain a miniaturized chip, it is preferable to use a thin woven fabric.

  In the present embodiment, the surface material is formed by a member such as rubber or resin, but the surface material may be formed by another elastic member. Furthermore, even if the surface material is not provided, it is possible to obtain the same effect as the present embodiment.

DESCRIPTION OF SYMBOLS 10 Tip split endless belt 11 Woven cloth 11a, 11b 1st, 2nd thread 12 Surface material

Claims (3)

  Chip split endless characterized by comprising as a core a woven fabric in which either one of S twist and Z twist is twisted so that the number of twists is 30 to 150 T / m is oriented in the circumferential direction. belt.   The tip split endless belt according to claim 1, wherein the number of twists is 90 T / m or less.   The tip split endless belt according to claim 1 or 2, wherein the twist number is 60 T / m or more.

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