JPH081809Y2 - Structure of polishing yarn for polishing brush - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to the structure of a polishing yarn (abrasive yarn) used for an abrasive brush.

(Prior Art) For example, as described in Japanese Patent Laid-Open No. 58-64157, the coated surface of a vehicle body of an automobile or the like, which has undergone an undercoating step or an intermediate coating step by electrodeposition coating or the like, is treated with water before the overcoating step. In the polishing step, it is polished smoothly by a polishing brush held by a playback robot or the like. This polishing brush is
A wheel-shaped product is used in which nylon fibers to which abrasive particles are attached are planted in a radial pattern, and the polishing brush is rotated by an actuator such as an air motor and is pressed against the coated surface with a predetermined pressing pressure. Then, the coated surface is polished while moving the polishing brush while supplying water by a separately provided water supply device.

By the way, as a yarn to be used for such a polishing brush, there is a yarn in which abrasive grains are mixed or attached in order to enhance the grinding ability.

(Problems to be solved by the invention) However, the polishing yarn for abrasive brushes in which such abrasive particles are mixed or adhered is usually nylon thread, and in order to take advantage of the characteristics of the material as nylon, the amount of abrasive particles mixed or adhered The amount cannot be made too large, and the abrasive grains are 30% to 35%
Since the amount of abrasive grains exposed on the end face of the grind yarn for polishing the coating film is small, it is impossible to expect a very high grinding force.

By the way, there is also known a technique in which a binder mixed with abrasive grains is uniformly attached to the outer peripheral surface of a polishing thread that does not contain abrasive grains (see, for example, Japanese Utility Model Laid-Open No. 56-78885), but it is evenly attached to the outer peripheral surface. It is difficult in practice, and the abrasive yarns rub against each other during use and the abrasive grains come off, so even if the diameter increases, the number of abrasive grains does not increase so much, and a sufficient effect can be obtained. Absent.

The present invention has been made in view of the above point, and it is an object of the present invention to provide a structure of a polishing yarn for a polishing brush, in which the number of abrasive grains mixed or attached is increased and the rigidity of the yarn is increased to enhance the grinding force. To aim.

(Means for Solving the Problems) In order to achieve the above object, the present invention provides a polishing brush spun yarn containing or adhering abrasive grains, and a central layer containing or adhering a predetermined amount of abrasive grains, An outer layer formed by laminating a plurality of thin layers in which abrasive grains are mixed or adhered to the outside of the center layer with an abrasive grain density higher than that of the center layer,
It is characterized by having a coating layer in which abrasive grains are not mixed or attached to the outside of the outer layer.

(Function) By keeping the abrasive density of the center layer low, the characteristics of the material of the center layer (nylon, etc.) are utilized to secure the rigidity such as the toughness and elasticity as a yarn, while the outside of the center layer is An outer layer is provided which is made up of a plurality of thin layers in which abrasive grains are mixed or adhered at an abrasive grain density higher than that of the central layer.
As a whole, the total number of abrasive grains mixed or attached to the yarn is increased, which increases the grinding force.

Further, the outer layer having a high abrasive grain density is not formed by coating once, but is formed by laminating a plurality of thin layers by repeating coating in small amounts. Grain retention is increased, and in combination with the coating layer located on the outer side of the outer layer, the removal of abrasive grains mixed or attached to the outer layer is significantly suppressed.

Embodiment An embodiment of the present invention will be described in detail below with reference to the drawings.

In FIGS. 1 and 2 showing a polishing brush, 1 is a wheel type polishing brush, and a unit brush 5 having a yarn 3 attached to a channel member 4 is attached around a drum 2 and the unit brush 5 is attached. The yarn 3 of No. 5 extends radially.

The braided yarn 3 has a base end portion attached and fixed to a channel member 4, while the drum 2 has left and right flanges 6 and 7 attached and fixed to a hollow cylindrical middle drum 8 with a plurality of bolts 9. Both ends of the channel member 4 are sandwiched between the inner peripheral surfaces of the outer peripheral wall portions 6a, 7a of the flanges 6, 7 on both sides of the drum 2 and the outer peripheral surface of the middle drum 8 to be adhesively fixed, so that the yarn spinning 3 Is attached to the drum 2.

In addition, as shown in FIGS. 3 and 4, the above-mentioned yarn 3 has a central layer 12 in which a predetermined amount of abrasive grains 11 are mixed or adhered.
Have. On the outside of the center layer 12, an outer layer 14 composed of a plurality of thin layers in which abrasive grains 13 are mixed or adhered at an abrasive grain density higher than that of the center layer 12 is formed, and the outside of the outer layer 14 A coating layer 15 is formed of a binder in which abrasive grains are not mixed or attached.

The center layer 12 is made of nylon yarn in which approximately 30% of abrasive grains are mixed or adhered, similarly to the conventionally known polishing brush yarn.

Then, in order to enhance the grinding force, a plurality of thin layers in which the abrasive grains 13 are mixed or attached at an abrasive grain density higher than the abrasive grain density of the central layer 12 are laminated on the outer side of the central layer 12 and the outer layer 14
Are formed. In this way, since the thin layers are laminated in multiple layers, the adhesion of each layer is good and the adhesion of the abrasive grains is also good,
A large amount of abrasive grains will be mixed in or attached to the outer layer 14 with a large holding force. A urethane-based, epoxy-based, or phenol-based binder is used as a binder for mixing or adhering the abrasive grains 13.

Abrasive grains 13 mixed or adhered in this way, in order to prevent the abrasive yarns 3, 3 from rubbing against each other and dropping off during use as a polishing brush, on the outer periphery of the outer layer 14,
A coating layer 15 made of the same or the same binder as the binder of the outer layer 14 is laminated.

The test results show that the center layer 12 has a thickness of about 0.9 mm, and the outer layer 14 has a laminated structure of four thin layers and has a diameter of about 1.25.
In the case of the 3 mm yarn, the amount of abrasive grains mixed or adhered is 5 as compared with the conventional one (where about 30% of abrasive grains are mixed or adhered and no outer layer or coating layer is provided). It has been confirmed that the workability can be improved by up to 6 times, the grinding force can be increased by 5 to 6 times, and the workability of grinding can be improved, and that it can be applied to the case of wet grinding.

It suffices that the coating layer 15 has a thickness of about 1 μm, which is formed by coating the binder in the above-mentioned embodiment.
It can be formed by dip coating, winding the yarn, or coating buff cement.

Specifically, as shown in FIG. 5, the permeation holes 24a, 25a of the perforated plates 24, 25 of the binder tank 22 containing the liquid binder 21 in which the abrasive grains 13 are mixed at an abrasive grain concentration of about 70%. In the central layer
The abrasive grains 13 are mixed or adhered to the outer peripheral surface of the abrasive yarn 13 via the binder 21 by passing the abrasive yarn 26 which becomes 12. By repeating this operation several times, the outer layer 14 formed by laminating a plurality of thin layers in which a large amount of abrasive grains 13 are mixed or attached is formed around the yarn 26 (center layer 12).
After that, the coating layer 15 is laminated on the outer peripheral surface of the outer layer 14 by passing through another binder tank containing only the binder in the same manner to manufacture the polishing yarn 3 for a polishing brush having a desired structure.

In this way, the mixing or attachment of the abrasive grains 13 of the outer layer 14 is performed by the binder 21, and the coating layer on the outer side of the binder 21 is used.
Since 15 is also formed of a binder, it is easy to manufacture.

According to this structure, the rigidity of the polishing yarn 3 for the polishing brush 1 is ensured by the central layer 12 and the number of abrasive grains can be significantly increased by the outer layer 14, so that the polishing performance (grinding force) is improved. Will be greatly improved.

Further, the abrasive grains 13 of the outer layer 14 are mixed or attached with a good holding force due to the good adhesiveness of the laminated structure thereof, and are protected by the coating layer 15, so that the spinning yarn 3, during use, The abrasive grains 13 mixed or adhering to each other will not fall off due to the friction between the three. As a result, the grinding performance does not deteriorate during use, the durability is excellent, and it is advantageous in terms of the life of the polishing brush 1.

(Effects of the Invention) As described above, the present invention has an outer side formed by laminating a plurality of thin layers in which abrasive grains are mixed or adhered to the outside of the center layer with an abrasive grain density higher than that of the center layer. Since the layer is provided, it is possible to improve the polishing performance by increasing the total amount of the abrasive grains mixed or attached to the yarn as a whole while ensuring the rigidity of the yarn by the central layer. Moreover, because of the good adhesion of the abrasive grains due to the laminated structure of the outer layer, and because the coating layer is laminated on the outer side of the outer layer, peeling of the outer layer and dropping of the abrasive grains are prevented, and also in terms of durability. Excellent, prolongs the life of the polishing brush.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIGS. 1 and 2 are a front view and a sectional view of an essential part of a polishing brush, and FIGS. FIG. 5 and FIG. 5 are views showing an example of a manufacturing apparatus for manufacturing a yarn. 1 …… Abrasive brush 3 …… Bonding yarn 11,13 …… Abrasive grain 12 …… Center layer 14 …… Outer layer 15 …… Coating layer

Claims (1)

[Scope of utility model registration request] 1. In a polishing yarn for a polishing brush containing or adhering abrasive grains, a center layer in which a predetermined amount of abrasive grains is incorporated or adhered, and an abrasive having a density higher than that of the center layer on the outside of the center layer. Polishing characterized by having an outer layer formed by laminating a plurality of thin layers in which abrasive grains are mixed or adhered at a grain density and a coating layer in which abrasive grains are not mixed or adhered outside the outer layer Structure of the brush yarn.