JPS6268281A - Industrial brush bristle - Google Patents

Abstract

PURPOSE:To make possible to obtain a satisfactory finished surface with a high degree of efficiency, by forming grooves in each of bristles in a number of 3 to 5 in the cross-section thereof so that it has a peculiar cross-sectioned shape having an averaged diameter of 0.4 to 3.0mm. CONSTITUTION:Grooves C is formed in each bristle having, as a base member,a synthetic resin monofilament containing abrasive particles B, in a number of 3 to 5 in the cross-section thereof. Further the bristle is not hollow but solid, and has an averaged diameter of 0.4 to 3.0mm. The thus formed bristle has a knife edge-like tip end and therefore, exhibits an extremely excellent grinding and polishing effect, thereby it is possible to obtain a satisfactory finished surface with a high degree of efficiency.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention is capable of obtaining a C1-quality finished surface with high efficiency in grinding and polishing metal surfaces, etc., and has durability that can withstand long-term use. This invention relates to a bristle material for industrial brushes having a monofilament containing abrasive particles as a base.

(Prior art) It has been well known in the field of industrial brushes to use monofilaments obtained by melt-spinning synthetic resin containing abrasive particles. It is used as an ordinary brush, or by hanging the monofilament in the form of a blind and passing the object to be polished under it.

However, brushes in which the above-mentioned monofilament containing abrasive particles is directly grafted onto the base material have poor abrasiveness because the monofilament itself is thin and lacks stiffness as a brush.
It is difficult to efficiently obtain a good polished surface. On the other hand, if an attempt is made to increase the polishing performance by increasing the thickness of the monofilament, the polishing performance will be improved, but the strength of the brush itself will decrease, making it more likely to break, making it impossible to withstand long-term use.

Bristles for brushes aimed at solving such problems and improving polishing properties include, for example, bristle materials for brushes with a rectangular cross section (Japanese Utility Model Publication No. 54-35920 and Japanese Utility Model Publication No. 56-49728). @Publication) can be mentioned, but
Although this brush bristle material has improved abrasiveness, it is easily broken and has poor durability. Also, for example, several thin abrasive particle-containing monofilaments are twisted or bundled and the surface is coated with multifilament etc.
-21294, etc.), but these do not only increase the manufacturing cost due to the addition of processing steps such as twisting and coating, and are not only economically unfavorable, but also reduce the efficiency of grinding and polishing operations. There is still room for improvement.

(Problems to be Solved by the Present Invention) Therefore, the present inventors developed an abrasive that can obtain a good ground and polished surface with high efficiency and is durable enough to withstand long-term use. As a result of intensive studies aimed at obtaining a bristle material for industrial brushes based on monofilament containing particles, we found that it is industrially easy, for example, to completely fuse multiple monofilaments together in the melt spinning process of monofilament containing abrasive particles. The inventors have now discovered that a bristle material for industrial brushes that meets the above objectives can be obtained by imparting a modified cross-sectional structure to the monofilament using a simple means, and have thus arrived at the present invention.

(Means for Solving the Problems) That is, the present invention is a brush bristle material having a synthetic resin monofilament containing abrasive particles as a base, which has [
The number of grooves to be pulled is 3 to 5, and the average diameter is 0.4 to 3. Qm
The present invention provides a bristle material for an industrial brush, which is characterized by having an irregular cross section of m.

The synthetic resins used in the present invention include polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon 6, nylon 66, and nylon 12, polyolefins such as polyethylene and polypropylene, and polyhalogenated polyvinyl chloride and polyvinylidene fluoride. It is a thermoplastic resin that can be melt-spun, such as vinyl.

The abrasive particles used in the present invention include alumina-based abrasives such as coke powder, bauxite, and alumina powder, silicon carbide-based abrasives such as white stone and mineral powder, and natural abrasives such as diamond, emery, and garnet. Examples include physical abrasives, carbide abrasives, zirconia abrasives, and glass abrasives, and two or more of these can be used in combination.The particle diameter of these abrasive particles is determined according to JIS R6001 (1956).
) Particle size specified by #30 to 1500, especially #60
A range of 500 to 500 is preferable, and if the particle size is larger than #30, the spinnability and toughness of the monofilament will deteriorate, and if the particle size is larger than #1
If it is smaller than 500, the polishing properties may deteriorate. The blending ratio of these abrasive particles is 3~
70% by weight, particularly 10 to 50% by weight, is preferred;
If it is less than 7% by weight, the desired polishing effect cannot be obtained;
If it exceeds ffl amount%, the toughness and melt spinnability of the monofilament will decrease, which is not preferable. It goes without saying that when the polishing effect is not particularly intended, a strong and durable brush can be obtained by using the embodiment of the present invention without incorporating abrasive particles.

The bristle material for brushes of the present invention can be obtained by: (1) containing abrasive particles in the above synthetic resin, melt-mixing the mixture and -H pelletizing it, or directly applying it to a melt extrusion spinning machine without pelletizing; A method of spinning from a spinneret equipped with a spinneret with a modified cross-section and stretching as necessary;
After spinning out 3 to 5 mm monofilaments, a plurality of abrasive particle-containing monofilaments are brought into contact with each other and completely fused together while the surface of the monofilaments is still in a molten state before cooling. It can be obtained by

In particular, according to method (1) above, it is possible to easily and efficiently obtain a strong brush bristle material with a stable center of gravity. To explain this method in more detail, the number of discharge holes in a spinneret having a desired number of holes is set to 3 to 5, the interval between the discharge holes is set to 0.2 to 0.7 mm, and the spinneret is placed in a cooling bath. Adjusting the position of the first cooling guide to bring three to five abrasive particle-containing monofilaments that have been spun from the spinneret and are still in a molten state before being cooled into contact with each other,
It is important to join the seven filaments together without leaving a hollow part in the center, and if the distance between the discharge holes of the spinneret exceeds 0.7 mm, complete fusion between the single filaments will be insufficient. Q: If it is less than 2 mm, the wear of the cap will be severe and the cross section will tend to become circular, which is not preferable.

Next, the cross-sectional structure of the industrial brush bristle material of the present invention will be explained according to the drawings. Fig. 1 is an enlarged sectional view of a monofilament single yarn containing abrasive particles, which has been conventionally generally used as a bristle material for brushes, and Fig. 2 is an enlarged sectional view of a bristle material for brushes of the present invention, which has a 1 q. FIG. 3 is an enlarged cross-sectional view of the bristle material for a brush of the present invention obtained by completely fusing three single monofilament yarns containing abrasive particles by the method (1) described above.

As seen in FIG. 1, in the monofilament single yarn containing abrasive particles, the abrasive particles A are uniformly and finely dispersed in the synthetic resin layer B from the core to the outer periphery of the monofilament.

-5 As shown in Figures 2 and 3, the brush bristle material of the present invention has an irregular cross section with 3 to 5 grooves C, and has an average diameter of 0. .4-3.
Qmm, it is characterized by being thicker than normal brush bristle material.

That is, the brush bristle material of the present invention has grooves C formed in its cross section and is solid, so it is strong, and when used as a brush, the tips of the bristles become knife-like, resulting in extremely excellent grinding, This produces a polishing effect. However, if the number of grooves C is less than 2, the brush will lack toughness and work efficiency will be poor, and if it is more than 6, the cross section of the monofilament will become close to circular, which will not only make the polished surface rough but also reduce the stiffness of the brush, so it is preferable. do not have. Also, the average diameter is 0.4
If it is less than 3.0 mm, the grinding and polishing properties will deteriorate, and if it exceeds 3.0 mm, it will be easy to break, which is not preferable.

The bristle material for industrial brushes of the present invention having the above-mentioned structure can be cut to a required length and bundled or implanted on a brush base to form a rotating or reciprocating brush, or it can be made into a slat-like shape. It is used for practical purposes such as letting the polishing material hang down and passing the object to be polished under it.

(Function) When the bristle material for an industrial brush of the present invention is used for practical use in polishing the surface of an object to be polished, the bristle material has grooves C formed in the cross section of the bristle material and is solid as described above. The tips of the bristles become knife-like and exhibit extremely excellent grinding and polishing effects, so not only can a good finished surface be achieved with high efficiency, but the bristles are strong and do not easily break, so they can be used for long periods of time. Excellent durability can be expected to withstand use.

The present invention will be explained in more detail with reference to Examples below.

(Example) A composition in which 25% of Showa Denko Co., Ltd.'s carbonized abrasive (#180) was blended with Toshishiku Co., Ltd.'s nylon 6 chips (M1021) was put into a 40 mm diameter melt extruder. A monofilament containing abrasive particles having a diameter of 0.5 mm and a perfect circular cross section was obtained by melting the mixture, spinning it out from a spinneret, cooling it, taking it off, and stretching it.This monofilament was referred to as a hair material Nα1.

On the other hand, when melt-spinning the above composition, a monofilament containing irregular cross-section abrasive particles having an average diameter of 1.1 mm was prepared in the same manner except that a spinneret having irregular cross-section spinning holes as shown in FIG. 2 was used. was manufactured. This monofilament is the hair material No.

Set it to 2.

Furthermore, when melt-spinning the above composition, the hole spacing Q, 5
Using a spinneret with 3 mm x 3 holes, place 3. QCm
For brushes, three spun single yarns with a single yarn diameter Q of 5 mm are brought into contact with each other at the position of , and completely fused by passing through a cooling guide installed 25 cm below the nozzle and in the first cooling bath. Manufactured wool material. This hair material has an average diameter of 1.
It has a cross-sectional shape of 1 mm as shown in FIG. 3, and this is designated as the hair material Nα3.

Similarly, a brush bristle material having an average diameter of 1.1 mm in which four abrasive particle-containing monofilaments were completely fused was produced using a spinneret with 4 holes with a hole spacing of 0.5 mm. This is referred to as hair material Nα4.

Similarly, a brush bristle material in which two monofilaments containing abrasive particles were completely fused was produced using a spinneret with hole spacing Q of 5 mm x 2 holes.

This is referred to as hair material Nα5.

Furthermore, in the same manner, using a spinneret with hole spacing Q of 5 mm x 3 holes, eight monofilaments with abrasive particles S were completely fused with an average diameter of 2. Qmm brush bristle material was manufactured. This is referred to as hair material Nα6.

Each of the brush bristle materials obtained in this way was densely implanted on a base with an outer diameter of 30 cm, a shaft diameter of 20 cm, and a width of 40 cm with a condolence letter of 5 cm to form a rotating brush, which was then rotated at a brush rotation speed of 100 Or.
Table 1 shows the results of polishing the surface of an aluminum plate with a thickness of 0.5 mm under the conditions of p, m, and lap of 15 mm, and the working time required to obtain a polished surface with a surface specularity of 38. show.

In addition, Table 1 shows the results of investigating the number of bristles that broke and fell from the base when the above polishing work was performed continuously for 2 hours.
It is also shown in .

As is clear from the results in Table-1, the brush bristle material of the present invention (NO2-4
) can obtain a good polished surface with excellent work efficiency, and has excellent durability with less breakage of the bristles.

- When using mari thread (No. 1), the same polished surface is
The work efficiency up to the end of the process is poor, and breakage is common.

Further, when the number of completely fused pieces is 2 (No. 5), the working efficiency is poor, and when the number of completely fused pieces is 8 pieces (No. 6), the number of broken pieces increases and the polished surface becomes rough, which is not preferable.

(Effects of the Invention) As explained above, the brush bristle material of the present invention not only can be made into 'A' shape by a simple and easy means, and can obtain a good finished surface with high efficiency, but also has a long length. Since it is durable enough to withstand use over time, it is expected to be applied to various industrial applications such as surface grinding and polishing of various objects to be polished, such as metal, wood, and stone.

[Brief explanation of drawings]

FIG. 1 is an enlarged sectional view of a single monofilament yarn containing abrasive particles, which has been conventionally used as a bristle material for brushes, and FIGS. 2 and 3 are enlarged sectional views of the bristle material for industrial brushes of the present invention. be. A: Abrasive particles B: Synthetic resin layer C: Hollow portion Patent applicant: Azuma Shinanofilament Co., Ltd. Figure 1 Figure 2 Figure 3

Claims (1)

[Claims] A brush bristle material having a synthetic resin monofilament containing abrasive particles as a base, characterized by having an irregular cross section with 3 to 5 grooves and an average diameter of 0.4 to 3.0 mm. Bristle material for industrial brushes.