TWI731019B - Brush materials and brushes using them - Google Patents

Abstract

A bristle material for a brush, characterized in that one or both ends of a composite fiber in the longitudinal direction of a composite fiber having a core sheath cross-sectional structure including a plurality of resin layers formed by two or more types of resins with different drug dissolution speeds , Forming at least one annular wall and at least one groove extending in the longitudinal direction of the composite fiber and at the same time extending across the entire circumference in the direction along the outer peripheral surface of the composite fiber, and the groove is in the ring The inner side of the wall is adjacent to the annular wall, extends along the annular wall and is recessed from the front end of the annular wall in the longitudinal direction of the composite fiber, and a brush using the same. The present invention can provide a brush bristle material and a brush using the brush bristle material. The brush bristle material exhibits excellent dirt by forming an annular wall at the tip of the bristle material and a groove formed on the inner side thereof. High-definition sweeping performance of scraping performance and excellent dirt capturing performance.

Description

Brush materials and brushes using them

The present invention relates to brush bristles suitable for various brushes including toothbrushes and brushes using the same.

From the past, it has been widely known to use monofilaments of synthetic fibers as brush hair materials. For brushes using such brush bristles, such as toothbrushes, it is desirable to have an excellent cleaning effect by the tip of the hair, and it is also desirable to have an excellent scraping performance of dirt or tartar during cleaning with the tip of the hair.

However, it is difficult for the brush hair material to be formed of monofilaments of a single material up to the tip of the hair to meet such requirements. That is, a single filament formed from a single material to the tip of the hair has a limited cleaning effect due to the tip itself. In particular, it may be difficult to obtain excellent scraping performance due to dirt or tartar on the tip of the hair.

There are roughly the same problems in brushes used for cleaning or cleaning in other fields.

Therefore, particularly in order to improve the cleaning effect, Patent Document 1 discloses a toothbrush hair material, which is formed by forming a hair material composed of a composite fiber having a core sheath cross-sectional structure so as to have a plurality of concave portions and convex portions on the outer periphery. The cross-sectional shape of the leaf, and at the same time at the front end of the hair material, the branch hairs formed by their convex parts are formed into a crown, and in the crown A dimple is formed in the center of the shaped part. In addition, Patent Document 2 discloses a structure of a bristle material for a brush, in which the front end of the bristle material is formed into a tapered portion, and the outer peripheral surface of the tapered portion is formed with pluralities extending in the fiber axis direction. Ditch.

However, in the toothbrush hair material disclosed in Patent Document 1, the dirt scraping effect is exhibited in the crown portion, and the cleaning effect can be improved by this. However, pits are formed between the convex portions forming the crown portion Therefore, even if the dirt is collected in the pit in the central part of the crown part, the dirt will easily escape through the pit, and there is a problem that the so-called escaping dirt may re-attach. In addition, the convex parts that form the crown of the crown are formed as intermittent convex parts protruding from the front end of the wool material. The elasticity of each convex part is not so high, and the so-called scraping effect remains for high-viscosity dirt. Low probability between problems. In addition, in the brush bristle material disclosed in Patent Document 2, since a plurality of grooves extending in the fiber axis direction are formed on the outer peripheral surface of the tapered portion, although the dirt scraping performance (cleaning performance) is improved The above is considered to be effective, but the performance of capturing the dirt once scraped cannot be too expected, and I hope to further improve it.

Prior art literature Patent literature

Patent Document 1 JP 2012-105743 A

Patent Document 2 JP 2009-089920 A

Therefore, the subject of the present invention is to focus on the problems remaining in the brush hair material as described in the conventional patent document 1, and to provide a brush hair material with excellent cleaning performance, and a brush using the brush hair material. The wool material system can further improve the dirt scraping performance of the hair tip part of the wool material, and at the same time, it can not escape and catch the dirt that has been scraped once.

In order to solve the above-mentioned problems, the brush hair material of the present invention includes a composite fiber having a core sheath cross-sectional structure including a plurality of resin layers formed by two or more types of resins with different drug dissolution speeds. At one or both ends in the longitudinal direction, at least one annular wall and at least one groove are formed, and the annular wall extends in the longitudinal direction of the composite fiber and at the same time spans the entire circumference in the direction along the outer peripheral surface of the composite fiber The groove is adjacent to the annular wall on the inner side of the annular wall, and extends along the annular wall and is recessed in the longitudinal direction of the composite fiber from the front end of the annular wall.

In the brush hair material of the present invention, one end or one end in the longitudinal direction of a composite fiber having a core sheath cross-sectional structure including a plurality of resin layers formed by two or more types of resins with different drug dissolution rates At both ends, the resin layer with a slow drug dissolution rate is appropriately left to form a ring-shaped wall by the drug dissolution treatment, and the resin layer with a fast drug dissolution rate is appropriately dissolved on the inner side to form a groove. That is, in the bristle material for the brush of the present invention, since the front end of the composite fiber constituting the bristle material has at least one annular wall that extends across the entire circumference in the direction along the outer peripheral surface of the composite fiber, The ring The wall system can exert the so-called edge effect when the dirt is scraped. In particular, the ring-shaped wall itself is given high elasticity due to the ring-shaped wall structure continuously extending across the entire circumference, and can exert a high degree of elasticity. It has excellent edge effect, and can also show excellent scraping performance for high-viscosity dirt. The dirt scraped by the ring-shaped wall will be collected in the groove formed on its inner side and captured by the groove. Since the groove system is surrounded by an annular wall extending over the entire circumference from its outside, the dirt caught by the groove does not escape easily beyond the annular wall, and the system is maintained in a good condition. The state of being caught in the ditch. Therefore, the hair tips provided with these ring-shaped walls and the grooves inside will exhibit excellent cleaning performance.

In the above-mentioned brush hair material of the present invention, the number of plural resin layers formed by two or more types of resins with different drug dissolution speeds may be two or more, but preferably 3-6 layers range. The number of the above-mentioned annular wall and the grooves inside each may be at least one. Therefore, when the number of plural resin layers is two, the radially outermost layer in the cross section of the composite fiber becomes the layer forming the annular wall, and the entire inner part becomes the layer forming the groove.

In addition, the depth of the groove formed inside the annular wall is not particularly limited, but it is preferably 0.1 mm or more, more preferably 0.5 mm or more, and still more preferably 1 mm or more. The depth of this groove can be set according to the purpose of the brush hair material, and by setting it to a specific depth or more, it can also exhibit high capturing performance for high-viscosity dirt.

In addition, the thickness of one resin layer in the cross section of the composite fiber is preferably in the range of 10 to 300 μm, more preferably The range of 15~150μm. Since each resin layer becomes the part where the above-mentioned annular wall and the groove forming the inner side are formed on the end of the composite fiber, in order to ensure the excellent dirt scraping performance by the annular wall and the excellent dirt catching by the groove For performance, it is advisable to set the thickness of the resin layer within the above-mentioned range.

In addition, in the brush hair material of the present invention, the diameter of the composite fiber is preferably in the range of 50 to 1,000 μm, and more preferably in the range of 80 to 500 μm. If the diameter of the composite fiber is less than 50 μm, the elasticity of the composite fiber part itself when used in a brush may become too weak, and the cleaning effect may decrease depending on the purpose. If the diameter of the composite fiber exceeds 1,000μm, the elastic force of the composite fiber part itself when used in the brush will become too strong. Although the shape of the annular wall and groove at the tip part is different, there will be a tip The composite fiber part of the root of the part is strongly pushed to the side of the object to be cleaned, and the object to be cleaned may be easily damaged.

In addition, in the brush hair material of the present invention, the length in the longitudinal direction of the composite fiber having the portion of the annular wall and the groove is preferably in the range of 0.5 to 10 mm. Since this length affects the performance of the annular wall with dirt-scraping performance and the groove with dirt-trapping performance as described above, it can be appropriately set from the above-mentioned range according to the application.

In addition, in the brush hair material of the present invention, it is also possible to adopt a structure having an opposed wall with the groove interposed and opposed to the annular wall, and the length of the composite fiber of the opposed wall is The height in the side direction is higher than the height of the above-mentioned annular wall. That is, on the inner diameter side of the fiber where the grooves are interposed between the annular wall, there is a shoot-like or telescope-like structure of the opposing wall with a higher height. If such a structure is adopted, since the head can be formed The thin tapered shape is used as the entire front end of the wool material, so while ensuring the dirt scraping performance by the annular wall and the dirt catching performance by the groove as described above, it can also realize the soft touch of the hair tip. .

In addition, in the brush hair material of the present invention, various shapes can be adopted for the extension shape of the at least one annular wall, and a structure including an annular wall extending in a circular shape can also be adopted. Any one of the structure of an annular wall with a special shape other than a circle. Regarding the annular wall that extends into a circle, it goes without saying that the annular wall that extends into a true circle with substantially the same wall thickness also includes an annular wall that extends in a wave shape or in the direction of extension. Annular wall with varying thickness of the upper wall. In addition, the ring-shaped wall that extends into a shape other than a circle includes a triangular or quadrangular shape, or a ring-shaped wall that extends in the form of a polygon above it, or all shapes that extend into a shape other than an angle. Annular wall.

In addition, in the brush hair material of the present invention, as for the cross-sectional shape of the entire composite fiber, any one of a shape formed in a circular shape or a shape formed in a special cross-sectional shape other than a circular shape may be adopted. By. What is necessary is just to decide appropriately according to the purpose, use form, use conditions, etc.

In addition, in the brush hair material of the present invention, the plural resin layers constituting the composite fiber are preferably made concentric. If it is concentric, it may take the form of concentric circles, and only any one of the layers may be formed in a polygonal shape other than a circular shape, or any of a form in which a cross-sectional shape of a different shape is formed. By making the plural resin layers concentric, it becomes possible to easily form the annular wall and groove desired in the present invention by the drug dissolution treatment.

The present invention also provides a brush, which uses the above-mentioned brush hair material of the present invention for at least a part of the brush. In particular, the brush of the present invention has excellent dirt scraping performance by the annular wall formed at the front end of the hair material and excellent dirt catching performance by the groove as described above, so it is suitable as a toothbrush or Tongue brushes, makeup brushes, coating brushes, etc.

In such a brush of the present invention, although it is also different depending on its use, the range of the hair length (the length from the root of the brush to the tip of the brush) of the preferable brush can be exemplified in the range of 1 to 50 mm. Preferably, it is in the range of 5 to 35 mm.

In this way, according to the present invention, it is possible to provide a bristle material for a brush, which exhibits excellent dirt scraping through the annular wall formed at the front end of the bristle material and the groove formed on the inner side thereof. High-definition sweeping performance and excellent dirt capturing performance.

In addition, according to the present invention, various brushes can be provided that use the above-mentioned brush bristles for at least part of the brushes, and particularly brushes suitable as toothbrushes, tongue brushes, makeup brushes, and coating brushes can be provided.

1. 21‧‧‧Brush material

2a, 2b, 2c, 2d, 22a, 22b, 22c, 22d‧‧‧resin layer

3. 23‧‧‧Composite fiber

4. 24‧‧‧Annular wall

5.25‧‧‧ditch

6, 26‧‧‧Cylindrical wall

7, 27‧‧‧Annular space

11‧‧‧Brush material

12‧‧‧Toothbrush components

12a‧‧‧Head surface side member

12b‧‧‧Back side member of head

13‧‧‧Toothbrush

14‧‧‧Pore-planting

15‧‧‧Flat line

16‧‧‧Through hole

17‧‧‧Hotball

31, 41, 51, 61, 71, 81, 91, 101‧‧‧Brush material

32a, 32b, 32c, 42a, 42b, 42c, 42d, 52a, 52b, 52c, 52d, 52e, 52f, 62a, 62b, 62c, 72a, 72b, 72c, 82a, 82b, 82c, 82d, 82e, 92a, 92b, 92c, 92d, 92e, 102a, 102b, 102c‧‧‧Resin layer

33, 43, 53, 63, 73, 83, 93, 103‧‧‧Composite fiber

34, 44, 54, 64, 74, 84, 94, 104‧‧‧Annular wall

35, 45, 55, 65, 75, 85, 95, 105‧‧‧ ditch

56, 66, 106‧‧‧Cylindrical wall

Fig. 1 shows a bristle material for a brush according to an embodiment of the present invention, Fig. 1(A) is a schematic side view of one end of the bristle material, and Fig. 1(B) is a schematic horizontal view along the line BB of Fig. 1(A) Sectional view.

Fig. 2 (A), (B) is a schematic configuration diagram showing a method of transplanting hair when the brush hair material is used for a toothbrush.

Fig. 3 is a schematic side view of one end of a bristle material for a brush according to another embodiment of the present invention.

4(A) to (D) are schematic cross-sectional views showing various morphological examples of the brush hair material of the present invention.

Fig. 5 (A) to (D) are schematic cross-sectional views showing more different various morphological examples of the brush hair material of the present invention.

The form of the invention

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

Fig. 1 shows a bristle material 1 for a brush according to an embodiment (Embodiment 1) of the present invention, and Fig. 1(A) shows one end of the bristle material 1. As shown in Figs. The brush hair material 1 is shown in Figure 1(B) and is formed of a composite fiber 3 having a core-sheath cross-sectional structure containing two or more types of resins with different drug dissolution rates (Figure In the example, there are 2 types of resins) formed by plural resin layers 2a, 2b, 2c, 2d. Especially in this embodiment, the plural resin layers 2a, 2b are arranged in concentric circles with the same thickness in the extending direction. , 2c, 2d. At one or both ends in the longitudinal direction of the composite fiber 3 (Figure 1(A) only shows one end of the wool 1), at least one annular wall 4 and at least one groove 5 are formed, and the annular wall 4 It extends in the longitudinal direction of the composite fiber 3 and at the same time extends across the entire circumference in the direction along the outer peripheral surface of the composite fiber 3, the groove 5 is adjacent to the annular wall 4 on the inner side of the annular wall 4, and Extend along the annular wall 4 and from the annular wall 4 The front end is recessed in the longitudinal direction of the composite fiber 3. In this embodiment, the annular wall 4 is formed as a circular annular wall extending with the same thickness in the direction in which it extends, and the groove 5 is formed so as to follow the annular wall with the same width inside the annular wall 4 4 Extending annular groove. The annular wall 4 is formed of a resin layer 2c that does not dissolve in the drug dissolution process but remains appropriately, and the groove 5 on its inner side serves as an annular space formed by appropriately dissolving the resin layer 2b in the drug dissolution process Is formed. Furthermore, in this embodiment, at one end of the wool material 1, the resin layer 2a is formed as a cylindrical wall 6 that is not dissolved during the drug dissolution process but remains appropriately, and the resin layer 2d is formed by the resin layer 2d being formed during the drug dissolution process. Properly dissolved annular space 7.

For the above-mentioned drug dissolution treatment, for example, an alkali treatment can be used. For a plurality of resin layers formed by two or more types of resins having different dissolution rates of the above-mentioned drug (for example, the dissolution rate of the alkali treatment), for example, by Nylon (Ny) (registered trademark), which is a resin that is not alkali-dissolvable, forms resin layers 2a, 2c, and polybutylene terephthalate (PBT), which is a polyester resin that is alkali-dissolvable, forms the resin layer 2b, 2d, only the designated length of the longitudinal direction end of the composite fiber 3 is alkali-treated, and only the resin layers 2b, 2d at the end portions are dissolved, thereby forming the one shown in Fig. 1(A) The end portion of the brush bristle material 1 having the annular wall 4, the groove 5, the cylindrical wall 6, and the annular space 7.

In this brush hair material 1, one or both ends of the composite fiber 3 in the longitudinal direction have a core sheath cross-sectional structure including a plurality of resin layers formed by two or more types of resins with different drug dissolution speeds On the above, the use of drug dissolution treatment to make the dissolution rate of the drug slow (in In the above-mentioned embodiment, a resin layer that is not alkali-dissolved is formed. The resin layer 2c is partially left to form the annular wall 4, and inside of the resin layer 2b, the portion of the resin layer 2b with a fast drug dissolution rate is appropriately dissolved to form the groove 5. Since the annular wall 4 is annularly formed as an annular wall that continuously extends across the entire circumference, the annular wall 4 can exert a high edge effect when the dirt is scraped, and it is also suitable for high-viscosity dirt. Can show excellent scraping performance. The dirt scraped by the annular wall 4 is collected in the groove 5 formed on the inner side, and is caught by the groove 5. However, the groove 5 is a ring that extends over the entire circumference from the outer side. The structure surrounded by the wall 4 makes it difficult for the dirt caught in the groove 5 to escape, and is well maintained in the state of being caught in the groove 5. Therefore, the hair tip portion provided with the annular wall 4 and the groove 5 inside thereof exhibits excellent cleaning performance.

The brush hair material 1 configured as described above is used in at least a part for the production of various brushes. Generally speaking, two representative methods are known as the method for planting the brush bristles on the brush constituent members. For these two methods, take the case of using a toothbrush as an example, while referring to Figure 2 Be explained.

Figure 2(A) shows the toothbrush 13 with the brush hair material 11 implanted on the head of the toothbrush component 12, and the method of transplanting the brush hair material 11 is as follows the line aa of Figure 2(A) The two methods shown in Figure 2(B) and (C) of the enlarged cross-sectional view. In the method shown in FIG. 2(B), the brush bristles 11 folded in half are inserted into the tuft holes 14, and the brush bristles 11 are fixed to the toothbrush constituent member 12 with a fixture called a flat wire 15. The finished toothbrush is usually called a flat toothbrush. In such a flat toothbrush, the two ends of the pre-made brush bristles 11 will become brushes The tip of the hair. In the method shown in FIG. 2(C), one end of the brush bristle material 11 is inserted through the through hole 16 of the head surface side member 12a of the toothbrush constituent member 12, and the heating device (not shown) touches the through hole 16 The end of the brush bristle material 11 is formed into a piece for preventing falling off or fixing called the hot ball 17, and then the head back side member 12b is joined to hide the hot ball 17, and the toothbrush product is completed. The finished toothbrush is often called a flat-line toothbrush. In such a non-flat toothbrush, one end of the brush bristle material 11 produced in advance becomes the bristle tip of the brush. Therefore, when the brush hair material 1 of the present invention is to be used in a flat-line toothbrush, the above-mentioned annular wall 4 and the inner groove 5 are formed at both ends of the brush hair material 1, when it is to be used in a flat-line toothbrush. In the case of a toothbrush, the annular wall 4 and the groove 5 are formed at one end of the brush bristle material 1.

Fig. 3 shows one end of the bristle material 21 for a brush according to another embodiment (Embodiment 2) of the present invention. In this embodiment, the brush bristles 21 are formed of composite fibers 23 having a core-sheath cross-sectional structure including two or more types arranged in concentric circles with different drug dissolution speeds. A plurality of resin layers 22a, 22b, 22c, 22d formed of resin (two types of resins in the example in the figure). At one or both ends of the longitudinal direction of the composite fiber 23 (only one end of the wool 21 is shown in FIG. 3), at least one annular wall 24 and at least one annular groove 25 are formed. The annular wall 24 It extends in the longitudinal direction of the composite fiber 23 and extends across the entire circumference in the direction along the outer peripheral surface of the composite fiber 23. The ring-shaped groove 25 is adjacent to the ring-shaped wall on the inner side of the ring-shaped wall 24 24, and extend along the annular wall 24 and depressed from the front end of the annular wall 24 in the longitudinal direction of the composite fiber 23. In this embodiment, the resin layers 22a, 22c are made of, for example, an alkali as a dissolving agent On the other hand, the resin layer 22b, 22d is composed of a resin with a slower dissolution rate (for example, polybutylene terephthalate (PBT)), and the resin layers 22b and 22d are made of, for example, a resin with a faster dissolution rate for alkali as a dissolving agent (for example, Polyethylene terephthalate (PET)), and the respective annular wall 24 is formed by a resin layer 22c that does not dissolve in the chemical dissolution process but remains appropriately, and the groove 25 is formed by the chemical In the dissolution process, the resin layer 22b is appropriately dissolved and formed, and the cylindrical wall 26, which is the central part of the opposed wall higher than the annular wall 24, is the resin that remains appropriately by not being dissolved in the drug dissolution process The layer 22a is formed, and the annular space 27 is formed by appropriately dissolving the resin layer 22d in the drug dissolution treatment. Moreover, the cylindrical wall 26 at the center and the annular wall 24 lower than its height form a bamboo-like or telescope-like structure, and the entire front end of the wool 21 is formed into a tapered shape with a narrow head. shape.

In such a brush bristle material 21 whose tip is formed into a tapered shape with a thin head, similarly to the first embodiment described above, the ring-shaped wall 24 exhibits excellent dirt-scraping performance and benefits. The groove 25 has excellent dirt catching performance and excellent cleaning performance. Compared with the first embodiment described above, since the tip portion is formed in a tapered shape with a thin head, it is also suitable for thinner parts (for example, between teeth). Can play an excellent cleaning effect.

Regarding the above-mentioned Embodiment 1 and Embodiment 2, the representative characteristics when applied to a toothbrush are summarized in Table 1. In the first embodiment, a resin layer containing nylon (Ny) (registered trademark) is used to form a ring-shaped wall, and a polybutylene terephthalate (PBT) resin layer is used to form a groove. In the second embodiment, the system contains The resin layer of polybutylene terephthalate (PBT) forms a ring The shaped walls are grooves formed by a resin layer of polyethylene terephthalate (PET), and each is formed by alkali treatment. The characteristics of brush bristles in Table 1 are expressed as the contrast characteristics of brush bristles formed by monofilament of a single material of nylon (registered trademark), which are caused by the tip of the brush bristles The dirt-scraping effect and dirt-catching effect of ® are expressed as the contrast characteristics with the wool material described in Patent Document 1 mentioned above. ○ in Table 1 indicates that it has characteristics equal to or higher than that of the comparison object, and ◎ indicates that it is significantly better than the comparison object.

The brush hair material of the present invention can take various forms in addition to the above-mentioned Embodiments 1 and 2. In Figs. 4 and 5, cross-sections of composite fibers illustrate various forms.

In the brush bristle material 31 shown in FIG. 4(A), a composite fiber 33 including a resin layer 32a arranged in a concentric shape at the center, a resin layer 32b on the outer side, and a resin layer 32c on the outermost layer is formed. And the same At this time, the resin layer 32b is formed as an annular wall 34, and the resin layer 32a at the center is formed as a groove 35 inside the annular wall 34. The brush hair material 41 shown in FIG. 4(B) is formed to include a resin layer 42a arranged in a concentric shape at the center, a resin layer 42b on the outer side, a resin layer 42c on the outer side, and a resin of the outermost layer. The composite fiber 43 of the layer 42d and the resin layers 32b and 42d are each formed as an annular wall 44, and the resin layers 42a and 42c are formed as a groove 45 inside the respective annular wall 44. The brush bristle material 51 shown in FIG. 4(C) is formed to include a central resin layer 52a arranged in a concentric shape, a resin layer 52b on the outer side, a resin layer 52c on the outer side, and a resin on the outer side. The composite fiber 53 of the layer 52d, the outer resin layer 52e, and the outermost resin layer 52f, and the resin layers 52c and 52e are each formed as an annular wall 54, and the resin layers 52b and 52d are formed as their own annular wall The groove 55 on the inner side of 54 and the resin layer 52a at the center are formed as a cylindrical wall 56 at the center. The brush hair material 61 shown in FIG. 4(D) is formed with composite fibers 63 including a resin layer 62a arranged in a concentric shape at the center, a resin layer 62b on the outer side, and a resin layer 62c on the outermost layer. At the same time, the outermost resin layer 62c is formed as a ring-shaped wall 64, the resin layer 62b is formed as a groove 65 inside the ring-shaped wall 64, and the resin layer 62a at the center is formed as a cylindrical wall 66 at the center.

In addition, the brush bristle material 71 shown in FIG. 5(A) is formed of composite fibers including a central resin layer 72a arranged in concentric circles, a resin layer 72b on the outer side, and a resin layer 72c on the outermost layer. 73, but the resin layer 72b is formed as a triangular shaped resin layer, this resin layer 72b is formed as an annular wall 74, and the resin layer 72a at the center is formed as a groove 75 inside the annular wall 74. The brush bristles shown in Figure 5(B) The material 81 is formed of a composite fiber 83 including a central resin layer 82a arranged in a concentric circle, a resin layer 82b on the outer side, a resin layer 82c on the outer side, a resin layer 82d on the outer side, and a resin layer 82e on the outermost layer. , But the resin layers 82b, 82d are formed as wavy-shaped resin layers extending into a ring shape, these resin layers 82b, 82d are each formed as an annular wall 84, and the inner resin layers 82a, 82c are formed as separate A groove 85 on the inner side of the annular wall 84. The brush bristle material 91 shown in FIG. 5(C) is formed to include a resin layer 92a arranged in a concentric shape at the center, a resin layer 92b on the outer side, a resin layer 92c on the outer side, and a resin on the outer side. The composite fiber 93 of the layer 92d and the outermost resin layer 92e, but the resin layers 92b and 92d are formed in a petal-like shape in which the thickness of the resin layer changes in the extending direction of the ring, and these resin layers 92b and 92d are each formed as In the annular wall 94, the resin layers 92 a and 92 c on the inner side thereof are formed as grooves 95 on the inner side of the respective annular wall 94. The brush bristle material 101 shown in FIG. 5(D) is formed with composite fibers 103 including a resin layer 102a at the center portion arranged in a concentric shape, a resin layer 102b on the outer side, and a resin layer 102c on the outermost layer. However, the cross-sectional shape of the composite fiber 103 and the respective resin layers 102a, 102b, 102c is formed into a hexagonal shape, the outermost resin layer 102c is formed as the ring-shaped wall 104, and the resin layer 102b is formed as the inner side of the ring-shaped wall 104. In the groove 105, the resin layer 102a at the center is formed as a cylindrical wall 106 at the center.

In this way, the composite fiber having a core sheath cross-sectional structure including a plurality of resin layers in the present invention can take various cross-sectional forms, and can be designed optimally according to the application or purpose of use.

[Example]

Hereinafter, embodiments of the present invention will be described.

Examples 1-11, Comparative Example 1 [Making of brush wool]

As raw materials, polybutylene terephthalate (PBT, "Toraycon" (registered trademark) 1100SW manufactured by Toray Co., Ltd.) and polyethylene terephthalate (PET, manufactured by Toray Co., Ltd.) T755M), nylon 610 (Ny610, Toray Co., Ltd. "Amilan" (registered trademark) CM2001), thermoplastic polyamide elastomer (Ny11-PTMG (polybutylene glycol), ARKEMA company "Pebax" (registered trademark) ) 72R53) and polybutylene naphthalate (PBN, manufactured by Toyobo Co., Ltd., AE-500) were prepared by drying under the recommended conditions. Make the core component, sheath component resin type, core component and sheath component area ratio, the number of resin layers, and the thickness of the resin layer (representative values) as shown in Table 2. A cross section of the core and sheath containing plural resin layers The structured composite fiber is melt-spun. Furthermore, the core component here refers to the component of the resin layer arranged at the center of the fiber cross section, and the sheath component refers to the component of the resin layer arranged outside the center of the fiber cross section. The structure of the resin layer of the fiber cross section is a repeating structure of core component, sheath component 1, (sheath component 2), core component, ‧‧‧ in order from the center.

After the eluted fiber is cooled and solidified in water, it is obtained as the first stage in warm water at 60°C, as the second stage in a dry environment at 120°C, stretched to 4.5 times, and then subjected to relaxation heat setting in a dry heat environment. Core sheath composite fiber. Table 2 shows the composition of the obtained core-sheath composite fiber.

The above-mentioned fibers were bundled into a linear shape with a bundle diameter of 45 mm, packaged, and then cut into arbitrary lengths. Next, in a state where the cut end faces are exposed, the bundle of composite fibers is immersed in a heated caustic soda solution to dissolve and remove both ends to form an annular wall. By changing the immersion time in the caustic soda solution, the length of the part with the annular wall and the groove in the longitudinal direction is controlled. Table 2 shows the characteristics of the resulting brush hair material.

As Comparative Example 1, the PBT fiber was immersed in a caustic soda solution in the same manner as described above to produce a brush bristle material in which both ends were processed into a tapered tapered head.

[Making of Toothbrush]

Install the brush bristles obtained by the above method in the flat thread type hair transplanter, and select the designated number (about 15-40), and fold them together with the flat thread into the pores of the toothbrush head. For the toothbrush head, a 1.5mm diameter transplanting hole with 8 rows and 4 columns is used. Table 2 shows the hair length (mm) and the number of hairs (roots/hole) of the toothbrushes produced in the Examples and Comparative Examples.

The following evaluations were performed for each toothbrush obtained, and the results shown in Table 2 were obtained.

[Sweeping Evaluation]

Coat the dentition model with artificial plaque made by NISSIN, and let it dry for more than 5 minutes. From the top of the dentition model, press the toothbrush containing water with a load of 230g, and scrub in the direction along the dentition with a stroke width of 70mm and a stroke speed of 180mm/sec. The evaluation of the tooth surface uses the upper side of the molar portion of the dentition model, and the evaluation of the interdental uses the outer side of the anterior tooth. The residue of dirt after scrubbing with a nylon toothbrush 20 times The remaining condition is used as a reference, and the cleaning performance is calculated from the number of scrubbing times until the reference is reached by the following formula.

Cleaning performance=20÷(the number of times of scrubbing before reaching the standard)

[Evaluation of Durability of Fleece Opening]

For the toothbrush, a load of 230g is applied vertically from the back side of the sliding surface to drop the warm water at 37°C. For the stainless steel corrugated plate, the stroke width is 70mm and the stroke speed is 180mm/sec in the longitudinal direction of the toothbrush. , Sliding movement 1000 times, measuring the outside opening rate (%) of the brush part. When the horizontal width of the brush part in the initial state is Amm and the horizontal width after sliding is Bmm, the calculation method of the hair outside opening rate is (B-A)/A×100%.

[Evaluation of hair split durability]

Under the same conditions as the evaluation of the durability of the hair outside, the hair tip cracking was observed every 50 times of washing, and the number of hair cracking hair materials was recorded as 5 pieces.

[Feeling and Foaming Evaluation]

Ask 20 adults to use toothbrushes for 30 days, and ask for answers using the following criteria, and use the average points as the evaluation value.

[Industrial Utilization Possibility]

The present invention is applicable to all brushes, and is particularly suitable for toothbrushes, tongue brushes, cosmetic brushes, coating brushes, and the like.

1‧‧‧Brush material

2a, 2b, 2c, 2d‧‧‧resin layer

3‧‧‧Composite fiber

4‧‧‧Annular wall

5‧‧‧ditch

6‧‧‧Cylindrical wall

7‧‧‧Annular space

Claims (8)

A bristle material for a brush, characterized in that one or both ends of a composite fiber in the longitudinal direction of a composite fiber having a core sheath cross-sectional structure including a plurality of resin layers formed by two or more types of resins with different drug dissolution speeds , Forming at least one annular wall and at least one groove extending in the longitudinal direction of the composite fiber and at the same time extending across the entire circumference in the direction along the outer peripheral surface of the composite fiber, and the groove is in the ring The inner side of the wall is adjacent to the annular wall, and extends along the annular wall and is recessed from the front end of the annular wall in the longitudinal direction of the composite fiber. The number of the plural resin layers is in the range of 4-6 layers . Such as the brush hair material of claim 1, wherein the thickness of a resin layer in the cross section of the composite fiber is in the range of 10 to 300 μm. Such as the brush hair material of claim 1, wherein the length of the composite fiber having the annular wall and the groove in the longitudinal direction is in the range of 0.5-10 mm. The brush hair material of claim 1, which has an opposed wall interposed between the groove and opposed to the annular wall, and the longitudinal height of the composite fiber of the opposed wall is greater than that of the annular wall The height is higher. The brush hair material of claim 1, wherein the at least one annular wall includes an annular wall extending in a circular shape. The brush hair material of claim 1, wherein the at least one annular wall includes an annular wall extending into a special shape other than a circle. Such as the brush hair material of claim 1, wherein the plural resin layers are set to be concentric. A brush which uses the brush hair material of any one of claims 1 to 7 on at least a part of it.

Images