JPS61176304A - Bristle material for brush - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention is an industrial application based on a monofilament containing abrasive particles that can obtain fine and beautiful finished surfaces with high efficiency in polishing metal surfaces. This invention relates to bristle material for brushes.

(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, in brushes in which the above-mentioned monofilament containing abrasive particles is directly grafted onto a base material, the monofilament itself is thin and lacks stiffness as a brush, resulting in poor abrasiveness and difficulty in efficiently obtaining a finely polished surface. . On the other hand, if an attempt is made to increase the stiffness of the brush by increasing the thickness of the monofilament, the polishing performance will be improved, but the polishing surface will become rough and the acquisition of a finely finished surface will be hindered.

To solve this problem and obtain a finely polished surface, brush bristle materials are made by twisting or bundling several thin monofilaments containing abrasive particles, and then covering the surface with multifilament, etc. (Utility Model Publication No. 49-38637 and Utility Model Publication No. 56-21294)
However, these methods are not only economically undesirable as they increase manufacturing costs due to the addition of processing steps such as twisting and coating. There is still room for improvement in work efficiency.

(Problems to be Solved by the Present Invention) Therefore, the present inventors aimed to obtain a bristle material for industrial brushes based on monofilament containing abrasive particles, which can obtain a fine and beautiful polished surface with high efficiency. As a result of intensive research aimed at this purpose, we have found that a bristle material for brushes that meets the above objectives can be created by an industrially easy and simple means of surface-fusing multiple monofilaments together in the melt-spinning process of monofilaments containing abrasive particles. The present invention has been achieved based on the discovery that the present invention can be obtained.

(Means for Solving the Problems) That is, the present invention, when melt-spinning a synthetic resin containing abrasive particles, surface-fuses a plurality of abrasive particle-containing monofilaments together before being cooled after spinning. The present invention provides a brush bristle material made of the following.

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 silica and sawdust, and natural material-based abrasives such as diamond, emery, and garnet. Examples include abrasives, carbide-based abrasives, zirconia-based abrasives, and glass-based abrasives, and two or more of these can be used in combination. The particle diameter of these abrasive particles is JIS R6001 (1956)
Particle size defined by R30~1500, especially #60~
A range of 500 is preferable, and if the particle size is larger than R30, the spinnability and toughness of the monofilament will deteriorate, and if the particle size is larger than R15,
If it is smaller than 00, the polishing properties may deteriorate. The blending amount of these abrasive particles is 3 to 7
0% by weight, especially 10 to 50% by weight is preferable; if it is less than 3% by weight, the desired polishing effect cannot be obtained, and if it exceeds 70% by weight, it is not preferable because the toughness and melt spinnability of the monofilament decreases. . It goes without saying that when the polishing effect is not particularly intended, a strong and durable brush can be obtained by the embodiment of the present invention even without containing abrasive particles.

The brush bristle material of the present invention can be prepared by adding abrasive particles to the above synthetic resin, melt-mixing the mixture and -H pelletizing it, or directly applying it to a melt extrusion spinning machine without pelletizing it, and then applying it to a spinneret. After spinning out a plurality of monofilaments from a monofilament, a plurality of abrasive particle-containing monofilaments are surface-fused together while the surface of the monofilament is still in a molten state before cooling.

Here, the diameter of the monofilament single yarn containing abrasive particles is usually 0.2 to 1.0 mm, particularly preferably 0.3 to 7 mm.

The bristle material for a brush of the present invention is desirably made of 2 to 10 monofilaments, particularly 3 to 7 monofilaments containing abrasive particles, which are surface-fused together.

Next, the surface fusion referred to in the present invention will be explained according to the drawings. Fig. 1 is an enlarged sectional view of a single monofilament yarn containing abrasive particles used in the present invention, and Fig. 2 is an enlarged view of the bristle material for a brush of the present invention, which is made by surface-welding three single monofilament yarns containing abrasive particles. The sectional view and FIG. 3 are enlarged sectional views of an undesirable brush bristle material made of three monofilament yarns containing abrasive particles completely fused together.

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.

- As shown in Figure 2, in the brush bristle material of the present invention, the three monofilament single yarns containing abrasive particles are interposed between each other only through the synthetic resin layer on the surface, preferably with a hollow hole in the center. They are fused with part C remaining, and this state is called surface fusion.

Such surface fusion brings the abrasive particle-containing monofilament single yarns, which are still in a molten state after spinning, into contact with each other,
Obtained by joining only the surface parts.

However, as shown in Figure 3, multiple monofilament yarns containing abrasive particles are completely fused together, making it appear as if they were one
Bristles that resemble book threads are outside the scope of the present invention, and it is not possible to obtain a finely polished surface with such brush bristles.

As described above, the brush bristle material of the present invention, which is made of abrasive particle-containing monofilament single yarns that are surface-fused to each other, has a spinneret with a desired number of holes, and the distance between the ejection holes is 0.3 to Q.
, 7 mm, and by adjusting the position of the first cooling guide installed in the cooling bath, a plurality of abrasive particle-containing monofilaments are spun from the spinneret and whose surfaces are still in a molten state before being cooled. By bringing it into contact,
It can be manufactured efficiently. However, if the interval between the discharge holes of the spinneret exceeds 0.7 mm, surface fusion between the single yarns will be insufficient, and if it is less than 0.2 mm, complete fusion will tend to occur, which is not preferable.

The brush bristle material 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 make a rotating or reciprocating brush, or it can be made into a sash-like bristle. It is used for practical purposes such as hanging down and passing the object to be polished under it.

(Function) When the brush bristle material of the present invention is put to practical use, the fused portion at the tip of the bristle material that contacts the surface of the object to be polished is peeled off in advance and divided into single threads. When polishing the surface of the object to be polished in this condition, the roots of the bristles are hard and stiff because they are fused to the surface, while the ends of the bristles are divided into single threads, so the polishing surface It is possible to precisely polish small gaps, etc., and efficiently obtain a fine and beautiful polished surface.

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

(Example) A mixture of nylon 6 chips (M1021> manufactured by Toshishiku Co., Ltd.) and 25 wt. The spinneret was melted and spun through a spinneret with three discharge holes each having a diameter of 2.3 mm arranged at intervals shown in Table 1.
For brushes, spun single yarns of single yarn diameter Q and 5 mm are brought into contact with each other at position m, and the surface is fused by passing through a cooling guide installed approximately 25 cm below the nozzle and in the first cooling bath. Manufactured wool material.

The tips of the single yarns of the brush bristle material obtained in this way are manually divided into individual single yarns, and the degree of surface fusion of the bristle materials is evaluated. Based on the results, only the tips of Q~ are divided into single yarns. , Δ - the entire hair material is divided into single yarns, and X - completely fused and cannot be divided into single yarns, as shown in Table 1.

In addition, each brush bristle material obtained above had an outer diameter of 3QCm and a shaft diameter of 20
cm, width 40 cm base with a condolence letter 5 cm densely flocked to make a rotating brush, and this brush rotation number 1 ooor, o
The table below shows the results of polishing the surface of an aluminum plate with a thickness of Q and 5 mm under conditions of lap amount 5 mm, and the working time required to obtain a polished surface with a surface specularity of 38.
It is also shown in 1.

For comparison, the working time was also determined for a rotating brush in which abrasive particle-containing single monofilament yarns that were not surface fused were similarly flocked.

Table 1 *1 - Surface specularity of 3S cannot be achieved. )
It is possible to obtain fine and beautiful polished surfaces with excellent work efficiency. On the other hand, the surface fusion state is weak (No5>
Or, in the case of using a single thread (No. 6), the work efficiency until obtaining a similar polished surface is inferior, and when complete fusion occurs (No. 4
), the bristles are too thick, making it impossible to obtain a fine and beautiful polished surface.

(Effects of the Invention) As explained above, the brush bristle material of the present invention can be manufactured by simple and easy means, and is useful for surface polishing of various objects to be polished such as metal, wood, and stone. Moreover, it is possible to obtain a beautiful finished surface with high efficiency, so it is expected to be applied to various industrial uses.

[Brief explanation of drawings]

Fig. 1 is an enlarged sectional view of a single monofilament yarn containing abrasive particles used in the present invention, and Fig. 2 is an enlarged view of the bristle material for a brush of the present invention, which is made by surface-welding three single monofilament yarns containing abrasive particles. The cross-sectional view and FIG. 3 are enlarged cross-sectional views of an unfavorable embodiment of a brush bristle material in which three monofilament yarns containing abrasive particles are completely fused together. A... Abrasive particle B... Synthetic resin layer C... Hollow part

Claims (1)

[Claims] A bristle material for a brush, which is obtained by melt-spinning a synthetic resin containing abrasive particles and surface-fusing a plurality of monofilaments containing abrasive particles together before being cooled after spinning.