JP5684502B2 - Tip split endless belt - Google Patents

Description

  The present invention relates to a chip split endless belt used when a chip such as a chip resistor is divided into predetermined dimensions.

  Conventionally, it is known that a chip such as a chip resistor is manufactured by sandwiching a board between a pair of chip split belts. In such chip division, the board is usually divided into elongated boards along one direction (primary division), and then the elongated board is divided along the width direction (secondary division) to form a large number of small chips. .

  In recent years, the size of chips has been reduced, and accordingly, belts used for chip division, particularly secondary division, have been reduced in size and may be wound around a minimum pulley and used. Therefore, as the belt used for chip splitting, a belt having high flexibility and thin thickness is preferred. For example, as disclosed in Patent Document 1, a woven fabric core is covered with rubber or resin. Is used (see Patent Document 1). In Patent Document 1, rubber or resin is coated on a woven fabric by dipping or coating, for example.

JP 2006-62141 A

  However, as in Patent Document 1, if the surface of the woven fabric is simply coated with rubber or resin, the rubber or resin may be peeled off from the woven fabric due to the load during chip splitting. Further, misalignment may occur in the woven fabric, and the warp and weft of the woven fabric may rub against each other and be worn away. Exfoliation of these resins and abrasion of the woven fabric may lead to a decrease in belt strength and shorten the belt life. Furthermore, even if the entire woven fabric is impregnated with rubber glue or resin by dipping, it cannot sufficiently prevent the resin from peeling or misalignment of the woven fabric. May become hard.

  Therefore, the present invention has been made in view of the above problems, and provides a chip-divided endless belt that can prevent peeling of the resin from the woven fabric and misalignment of the woven fabric and improve the belt life. The purpose is to do.

  The tip split endless belt according to the present invention includes a canvas and a thermoplastic resin layer laminated on one surface side of the canvas and press-fitted into the canvas so as to reach the other surface of the canvas. Features.

  It is preferable that the resin of the thermoplastic resin layer oozes out on the other surface and covers the other surface. The canvas is, for example, a bag-woven fabric.

  The chip split endless belt manufacturing method according to the present invention is a manufacturing method in which a thermoplastic resin sheet is overlapped on one surface of a canvas to integrate them, and by applying pressure while heating the thermoplastic resin sheet, The melted thermoplastic resin sheet is pressed into the canvas to reach the other surface of the canvas.

  In the present invention, by inserting the thermoplastic resin layer into the canvas, it is possible to prevent misalignment of the canvas and peeling of the resin layer that occur during use, and to improve the belt life.

It is a schematic diagram showing a chip division device. It is sectional drawing which shows the outline of a chip | tip split endless belt. It is sectional drawing which shows the outline of the manufacturing method of a chip split endless belt. It is the schematic which shows the testing machine and belt layout of a durability test.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is a schematic view showing a process of obtaining a large number of chips 12 from a single board 10 using a chip split endless belt according to an embodiment of the present invention.

  As shown in FIG. 1, the board 10 is divided along one direction into a large number of elongated boards 11. The elongated board 11 is further divided along a direction perpendicular to the longitudinal direction to form a chip 12. The chip 12 is a small chip having a length and width of 1 mm or less, such as 0.6 mm × 0.3 mm and 0.4 mm × 0.2 mm.

  In this embodiment, when the elongated board 11 is divided into chips 12, the chip dividing device 20 is used. The chip splitting device 20 is an upper endless belt 22 that runs around four pulleys 21 and a lower endless belt that runs around the four pulleys 23 and is disposed below the upper endless belt 22. 24.

  The lower endless belt 24 is disposed such that a part of the outer peripheral surface thereof faces a part of the outer peripheral surface of the upper endless belt 22. A portion of the lower endless belt 24 facing the upper endless belt 22 is pushed upward by the small-diameter pulley 25 and a part thereof is bent. In addition, a pressing pulley 26 that is movable up and down is disposed so as to face the small-diameter pulley 25 with the belts 22 and 24 interposed therebetween.

  The elongated board 11 is fed into the gap between the portions of the belts 22 and 24 facing each other. At this time, the longitudinal direction of the elongated board 11 coincides with the belt circumferential direction. The elongated board 11 is divided into chips 12 by being pressed against the pressing pulley 26 via the upper endless belt 22 at the bent portion S bent by the small-diameter pulley 25.

  The belts 22 and 24 are flat belts, and the upper endless belt 22 has a belt outer peripheral surface serving as a chip dividing surface formed of rubber, for example. On the other hand, the lower endless belt 24 has a belt outer peripheral surface which is a chip splitting surface formed of a thermoplastic resin as will be described later. Also increases the hardness.

  Next, the lower endless belt 24 will be described in more detail with reference to FIG. The lower endless belt (chip split endless belt) 24 is a seamless endless flat belt, and includes a canvas 31 constituting a belt core and a thermoplastic resin layer 32.

  The canvas 31 is a woven fabric woven seamlessly by bag weaving or the like, and is woven by wefts arranged along the circumferential direction and warps arranged along the width direction. . Here, the thread (weft) along the circumferential direction is preferably a stretchable thread in order to impart stretchability in the belt circumferential direction, for example, a polyamide fiber thread such as a wooly nylon thread, or a polyester fiber thread. . Further, the yarn (warp yarn) along the width direction is preferably a non-stretchable yarn having high rigidity, for example, an aramid fiber yarn.

  The warp and weft of the woven fabric preferably have a yarn thickness of 33 to 240 dtex and a weave density of 50 to 190 yarns / inch. When the thickness and weaving density of the yarn are in such ranges, the thermoplastic resin layer 32 can reach from one surface of the canvas 31 to the other surface by heating and pressurizing described later. In addition, the above-described small chip is prevented from sinking into the concave portion of the weave, and chip breakage or the like is prevented. The canvas 31 may be impregnated with an adhesive such as rubber glue or RFL.

  The thermoplastic resin layer 32 is laminated on the one surface 31 </ b> A side that is the outer peripheral surface of the canvas 31, and is integrated with the canvas 31. In the lower endless belt 24, the surface on which the thermoplastic resin layer 32 is laminated is a belt outer peripheral surface 24A to form a chip splitting surface, and the opposite surface is a belt inner peripheral surface 24B. The pulley contact surface.

  The thermoplastic resin layer 32 is composed of a thermoplastic resin such as a urethane resin. The hardness of the thermoplastic resin layer 32 is set to, for example, about 85 to 98 degrees in consideration of chip splitting and durability. The hardness is a type A durometer hardness measured based on JIS K 6253.

  The thermoplastic resin layer 32 is press-fitted into the canvas 31 from one surface 31 </ b> A, passes between yarns constituting the canvas 31, and reaches the other surface (inner peripheral surface) 31 </ b> B of the canvas 31. In the present embodiment, the thermoplastic resin reaches the entire other surface 31 </ b> B of the canvas 31, and the thermoplastic resin penetrates into the entire clearance inside the canvas 31. Further, the thermoplastic resin oozes out on the other surface 31B of the canvas 31 and covers the entire other surface 31B.

  However, a part of the thermoplastic resin layer 32 is not press-fitted into the canvas 31 and remains disposed on the one surface 31 </ b> A of the canvas 31. The thickness of the thermoplastic resin layer that is not press-fitted into the canvas 31 and is disposed on the one surface 31A of the canvas 31 is thicker than the thickness of the thermoplastic resin that covers the other surface 31B of the canvas 31. Thus, by increasing the thickness of the resin arranged on the chip splitting surface (belt outer peripheral surface 24A), the load generated during chip splitting is less likely to be applied to the canvas 31, and the life of the belt can be easily improved.

  Next, the manufacturing method of the chip | tip split endless belt in this embodiment is demonstrated using FIG. In the present embodiment, the belt is manufactured by a forming die having a lower die 40 and an upper die 41. First, the lower mold 40 is disposed on the inner peripheral side of the endless canvas 31, and a part of the canvas 31 in the circumferential direction is placed on the lower mold 40. Next, the thermoplastic resin sheet 42 is wrapped around the outer periphery of the canvas 31 in a cylindrical shape, so that the thermoplastic resin sheet 42 is stacked on one surface 31 </ b> A of the canvas 31.

  Next, the lower mold 40 and the upper mold 41 are heated to a predetermined temperature, and the upper mold 41 disposed above the thermoplastic resin sheet 42 is moved downward, and the canvas 31 is moved by the upper mold 41 and the lower mold 40. And the resin sheet 42 is inserted | pinched and it pressurizes in the thickness direction, heating these. At this time, the lower mold 40 and the upper mold 41 are heated to a temperature higher than the melting start temperature of the thermoplastic resin constituting the thermoplastic resin sheet 42. The heating temperature of the lower mold 40 and the upper mold 41 is preferably higher by 10 ° C. or more than the melting start temperature in order to allow the resin to uniformly reach the other surface 31B of the canvas 31. Furthermore, in order to prevent foaming of the resin and improve the formability of the belt, the difference between the melting start temperature and the heating temperature is preferably about 20 ° C. or less.

  The thermoplastic resin sheet 42 is melted by the heating, and the molten thermoplastic resin sheet 42 is pressed into the canvas 31 by being pressed by the upper mold 41 and reaches the other surface 31B of the canvas 31. At this time, the surface of the canvas 31 is uneven due to the texture or the like, and there is a slight gap between the lower mold 40 and the other surface 31B of the canvas 31. Therefore, the thermoplastic resin that has reached the other surface 31B oozes out into the gap (that is, on the other surface 31B) and covers the other surface 31B of the canvas 31.

  Thereafter, a cooling medium such as cooling water is fed into the upper mold 41 and the lower mold 40 to cool and solidify the thermoplastic resin sheet 42 that has been heated and melted, and heat is partially applied in the circumferential direction of the canvas 31. The plastic resin sheet 42 is integrated. Such an operation is repeated a plurality of times, and the thermoplastic resin sheet 42 is integrated with the entire circumference of the canvas to obtain the chip split endless belt 24 shown in FIG.

  As described above, in the present embodiment, since the thermoplastic resin layer 32 is press-fitted into the canvas 31, each yarn of the canvas 31 is strongly held by the thermoplastic resin. Therefore, peeling between the canvas 31 and the resin layer 32 and misalignment in the canvas 31 can be prevented, and the life of the belt can be extended. In addition, since the thermoplastic resin layer 32 is press-fitted into the canvas 31, the thickness of the belt 24 can be reduced and the belt can be easily wound around a small-diameter pulley.

  In the present embodiment, the upper endless belt 22 (see FIG. 1) is, for example, a conventionally known tip split endless belt, and therefore detailed description thereof is omitted. However, a tip split endless belt having the same configuration as the lower endless belt 24 described above may be used.

  An apparatus for dividing the board 10 into the elongated boards 11 is the same as the chip dividing apparatus 20. As the upper endless belt and the lower endless belt in the apparatus, those different from the belt of the chip dividing apparatus 20 described above are used, but belts having the same configuration may be used.

  Next, the present invention will be described in more detail using examples, but the present invention is not limited to the examples described below.

[Formability evaluation]
First, formability evaluation was performed using Examples 1 to 7 and Comparative Example 1 shown below.
[Example 1]
An aramid fiber yarn having a yarn thickness of 110 dtex is used as a warp, and a polyester fiber yarn having a yarn thickness of 140 dtex is used as a weft. The yarns are arranged in the width direction and the circumferential direction, respectively. An endless bag woven fabric woven with a book / inch was prepared. A thermoplastic resin sheet made of polycarbonate urethane resin having a hardness of 98 degrees and having a thickness of 0.15 mm was stacked in a cylindrical shape on the outer peripheral surface of the bag-woven fabric. A part of the woven fabric and the resin sheet in the circumferential direction are press-heated at a pressure of 0.7 MPa for 3 minutes with an upper mold and a lower mold heated to 210 ° C., and the thermoplastic resin sheet is softened and melted to be fluidized. And pressed into a part of the woven fabric in the circumferential direction. Thereafter, cooling water was fed into the upper mold and the lower mold and cooled to obtain a thermoplastic resin sheet integrated with a part of the woven fabric in the circumferential direction. This operation was repeated a plurality of times to integrate the thermoplastic resin sheet all over the woven fabric, and the chip split endless belt of Example 1 was obtained.

[Examples 2 to 7]
Examples 2 to 5 were carried out in the same manner as Example 1 except that the weaving density of warps and the temperatures of the upper and lower dies during pressing were changed as described in Table 1. In Examples 6 and 7, a thermoplastic resin sheet made of a polycarbonate urethane resin having a hardness of 85 degrees was used as the thermoplastic resin sheet, and the press temperature was changed as described in Table 1, except that the press temperature was changed as shown in Table 1. 1 was carried out.

[Comparative Example 1]
In Comparative Example 1, a one-pot type molding apparatus was used as an apparatus for molding the belt. In Comparative Example 1, a bag woven fabric and a thermoplastic resin sheet wound in this order on a mandrel of a molding apparatus were placed in a molding kettle, the kettle temperature was 175 ° C., and the pressure was 1.10 MPa at 20 ° C. By pressurizing for a minute, the thermoplastic resin sheet was integrated with the bag-woven fabric, and the endless belt of Comparative Example 1 was produced. Note that the thermoplastic resin sheet was not melted during heating and pressurization. Other conditions were the same as in Example 1.

  In the moldability evaluation, it was evaluated whether the resin was press-fitted into the woven fabric and oozed out into the inner peripheral surface of the woven fabric with respect to the chip split endless belts obtained in each of the above Examples and Comparative Examples. In Table 1, the resin oozes out on the entire inner peripheral surface of the woven fabric and covers the entire inner peripheral surface. In Table 1, the resin oozes out on the inner peripheral surface of the woven fabric. A case where the resin was not removed is indicated by Δ, and a case where the resin did not ooze out on the inner peripheral surface of the woven fabric is indicated by ×.

  As described above, in Examples 1 to 7 in which the thermoplastic resin sheet is melted and fluidized and integrated with the woven fabric, the resin sheet oozes up to the inner peripheral surface of the woven fabric and is appropriately integrated with the woven fabric. I was able to. However, in Examples 5 and 7, since the heating temperature was relatively low and the resin sheet was not sufficiently fluidized, the entire inner peripheral surface of the woven fabric could not be covered with the resin. On the other hand, in Comparative Example 1, since the heating temperature is low and the resin sheet and the woven fabric are integrated without fluidizing the thermoplastic resin sheet, the resin sheet oozes up to the inner peripheral surface of the woven fabric. There wasn't.

[Durability test]
Next, a durability test was performed using the belts of Example 8 and Comparative Example 2.
[Example 8]
The bag woven fabric before being integrated with the resin sheet was immersed in an adhesive treatment solution and then impregnated by drying, and the pressure during press heating was changed to 0.89 MPa, as in Example 1. Implemented. In addition, the obtained chip | tip split endless belt was 880 mm in length, and was cut | judged to 15 mm in width.

[Comparative Example 2]
This was carried out in the same manner as in Comparative Example 1 except that the bag-woven fabric was subjected to the same impregnation treatment as in Example 8. The length and width of the belt were the same as in Example 8.

  The belts of Example 8 and Comparative Example 2 were attached to a testing machine 50 shown in FIG. The test machine 50 is a test machine that virtually reproduces the chip dividing device. The belt 51 is arranged around a driving pulley 52 and driven pulleys 53 and 54 of the testing machine 50, and is arranged in a layout in which tensioners are provided by two pulleys 55 and 56. At this time, the woven fabric was disposed on the belt inner peripheral surface side, and the resin layer was disposed on the belt outer peripheral surface side. Further, the belt 51 had a mounting elongation rate of 1%.

  A small-diameter pulley 57 having a diameter of 8 mm was disposed so as to push the belt 51 upward, and a pressing pulley 58 having a diameter of 40 mm was disposed at a position facing the small-diameter pulley 57. The pressing pulley 58 was affixed with a chip on the outer peripheral surface serving as a belt contact surface. A 5 kg weight (not shown) was attached to the pressing pulley 58, and the pressing pulley 58 was pulled downward by the weight so that the outer peripheral surface to which the chip was attached was always pressed against the outer peripheral surface of the belt 51. In this state, the rotational speed of the drive pulley 52 was set to 700 rpm, and the belt 51 was allowed to travel for 2 hours. Then, the appearances of the belts of Example 8 and Comparative Example 2 were visually observed.

  In the belt of Example 8 after running for 2 hours, streaks were formed at the portion where the chip was pressed, but the resin layer was not peeled off from the woven fabric and the yarn of the woven fabric was not broken. On the other hand, the belt of Comparative Example 2 was streaked in the same manner as in Example 8, and the resin layer where the streaks were formed was peeled from the woven fabric. In addition, in the portion where the chip was pressed, a part of the weft was broken. The formability of the belt before running was evaluated. As a result, Example 8 was evaluated based on the above evaluation criteria, and Comparative Example 2 was evaluated as x.

  As described above, the belt of the example has good integral formability of the resin layer and the woven fabric, and in the chip dividing device, the resin layer is not easily peeled off from the woven fabric or the yarn is not easily broken. Durability could be improved.

10 Board 11 Slender board 12 Chip 24 Lower endless belt (Chip split endless belt)
31 Canvas 32 Thermoplastic resin layer 42 Thermoplastic resin sheet

Claims (4)

A canvas and a thermoplastic resin layer laminated on one side of the canvas and press-fitted into the canvas to reach the other side of the canvas;
In the canvas and the thermoplastic resin layer, an upper mold and a lower mold are formed by superposing a thermoplastic resin sheet made of a urethane resin on one surface of the canvas and heating it to a temperature that is 10 ° C. or more and 20 ° C. or less lower than the melting start temperature are integrated by heat-pressing by,
A portion of the thermoplastic resin layer is not press-fitted into the canvas, but is still placed on one surface of the canvas, and is not press-fitted into the canvas, on one surface of the canvas. A chip split endless belt , wherein the thickness of the thermoplastic resin layer disposed is greater than the thickness of the thermoplastic resin covering the other surface of the canvas .   2. The chip split endless belt according to claim 1, wherein the resin of the thermoplastic resin layer oozes out on the other surface and covers the other surface.   The tip split endless belt according to claim 1, wherein the canvas is a woven bag. In the method of manufacturing a chip split endless belt in which a thermoplastic resin sheet made of urethane resin is overlapped on one surface of a canvas and integrated,
The molten thermoplastic resin sheet is press-fitted into the canvas by press-heating the canvas and the thermoplastic resin sheet with an upper mold and a lower mold heated to a temperature of 10 ° C. or more and 20 ° C. or less lower than the melting start temperature. Let it reach the other side of the canvas ,
A portion of the thermoplastic resin layer is not press-fitted into the canvas, but is still placed on one surface of the canvas, and is not press-fitted into the canvas, on one surface of the canvas. The method of manufacturing a chip split endless belt , wherein the thickness of the thermoplastic resin layer to be disposed is made thicker than the thickness of the thermoplastic resin covering the other surface of the canvas .

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