TW201735832A - Brush bristle material, and brush using same - Google Patents

Abstract

Provided is a brush bristle material characterized in that, at one end or both ends in the lengthwise direction of a composite fiber having a core-in-sheath cross-sectional structure comprising a plurality of resin layers formed from at least two types of resin having different drug dissolution rates, at least one circular wall, which extends in the lengthwise direction of the composite fiber and extends across the entire periphery in the direction along the outer peripheral surface of the composite fiber, and at least one groove, which extends along the circular wall adjacent to the circular wall on the inner side thereof and is recessed in the lengthwise direction of the composite fiber from the tip of the circular wall, are formed. Further provided is a brush using the brush bristle material. As a result of the circular wall formed at the tip of the bristle material and the groove formed on the inner side of the circular wall, it is possible to provide: a brush bristle material that demonstrates a high cleaning performance including both an excellent dirt-scraping ability and an excellent dirt-trapping ability; and a brush using the brush bristle material.

Description

Brush with wool and brush using it

The present invention relates to a brush material suitable for various brushes including a toothbrush and a brush using the same.

From the past, a technique of using a monofilament of synthetic fiber as a brush material has been widely known. In the brush using such a brush material, for example, in a toothbrush, it is desirable to have an excellent cleaning effect by the tip of the hair, and it is desirable to have excellent scraping performance of dirt or tartar when cleaning by the tip of the hair.

However, it is difficult to satisfy such a requirement that the brush is formed of a single material monofilament from the hair material to the tip of the hair. That is, the one formed by the single-filament monofilament until the tip of the hair is limited in the cleaning effect by the tip of the hair itself, and in particular, it is difficult to obtain the excellent scraping performance by the dirt or tartar of the tip.

There are also substantially the same problems in brushes for cleaning or cleaning in other fields.

Therefore, in order to enhance the cleaning effect, Patent Document 1 discloses a toothbrush material for a toothbrush which is formed of a composite material having a core-sheath cross-sectional structure and has a plurality of concave portions and convex portions on the outer circumference. The shape of the leaf is at the same time, and at the same time at the front end of the wool, the branching hairs formed by the convex portions are formed into a crown shape, and in the crown A central portion of the shaped portion is formed with a pit. Further, Patent Document 2 discloses a structure of a brush bristle material in which a front end portion of a bristle material portion is formed into a tapered shape portion, and an outer peripheral surface of the tapered shape portion is formed to have a plurality of extending in the fiber axis direction. Ditch.

However, in the brush material for a toothbrush disclosed in the above Patent Document 1, the dirt scraping effect is exhibited in the crown portion, and thereby the cleaning effect can be improved, but the pit is formed between the convex portions forming the crown portion. Therefore, even if the dirt is collected into the pit of the central portion of the crown portion, the dirt is likely to escape through the pit, and there is a problem that there is a possibility that the escaped dirt reattaches. Further, since the convex portion forming the crown portion is formed as an intermittent convex portion protruding from the tip end of the wool material, the elastic force of each convex portion is not so high, and the so-called scraping effect remains for the dirt having high viscosity. Low probability between the questions. Further, in the brush bristle material disclosed in the above-mentioned 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, the dirt scraping performance (cleaning property) is improved. It is considered to be effective, but it cannot be expected to capture the performance of the dirt once scraped, and hopes to further improve.

Prior technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open Publication No. 2012-105743

Patent Document 2 Japanese Patent Laid-Open Publication No. 2009-089920

Then, the problem of the present invention is to provide a brush bristle material having excellent cleaning property and a brush for using the brush, which is the problem of the brush bristle material which is described in the above-mentioned Patent Document 1. The wool material system can further improve the dirt scraping performance by the tip of the wool material, and at the same time, it can be prevented from being escaped and well captured for the dirt once scraped.

In order to solve the problem, the brush bristle material of the present invention includes a composite fiber having a core-sheath cross-sectional structure including a plurality of resin layers formed of two or more types of resins having different dissolution rates of the drug. One end portion or both end portions 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 conjugate fiber and simultaneously spans the entire circumference along the outer peripheral surface of the conjugate fiber. Extending the ground, 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 from the front end of the annular wall in the longitudinal direction of the composite fiber.

In the brush material of the present invention, the one end portion of the conjugate fiber having a core-sheath cross-sectional structure including a plurality of resin layers formed of two or more types of resins having different dissolution rates of the drug or At the both end portions, the resin layer portion which is slow in the dissolution rate of the drug is appropriately left by the drug dissolution treatment to form an annular wall, and the resin layer portion having a high dissolution rate of the drug is appropriately dissolved inside the both ends to form a groove. In other words, in the brush bristle material of the present invention, at least one annular wall extending over the entire circumference along the outer peripheral surface of the conjugate fiber is formed at the end portion of the conjugate fiber constituting the mascara. The ring When the wall is scraped off, the wall system can exert a so-called edge effect, and in particular, it can be made high by imparting high elasticity to the annular wall itself by an annular wall structure extending continuously over the entire circumference. The edge effect and excellent scratch performance for dirt with high viscosity. The dirt scraped off by the annular wall is trapped in the groove formed on the inner side thereof and captured by the groove. Since the groove system is surrounded by the annular wall extending all the way from the outer side, the dirt caught by the groove does not escape the annular wall portion and easily escapes, and is maintained well. Captured in the state of the ditch. Therefore, the tip portion having such an annular wall and the groove on the inner side thereof exhibits excellent cleaning properties.

In the brush material of the present invention, the number of the plurality of resin layers formed by the resin having two or more types of different drug dissolution rates may be two or more layers, preferably 3 to 6 layers. range. The number of the annular wall and the inner groove may be at least one. Therefore, when the number of the plural resin layers is two, the radially outermost layer in the cross section of the conjugate fiber is a layer forming the annular wall, and the inner portion thereof is integrally formed as a layer forming the groove.

Further, the depth of the groove formed on the inner side of the annular wall is not particularly limited, but 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 the groove can be set according to the use of the brush material, and by setting it to a specific depth or more, it can exhibit high catching performance for dirt having high viscosity.

Further, the thickness of one of the cross-sections of the conjugate fiber is preferably in the range of 10 to 300 μm, more preferably Range of 15~150μm. Since the resin layer is a portion where the annular wall and the groove forming the inner side are formed at the end portion of the conjugate fiber, it is excellent in the scraping performance by the annular wall and the excellent dirt trapping by the groove. For the performance, it is preferred to set the thickness of the resin layer to the range as described above.

Further, in the brush material for a brush of the present invention, the diameter of the conjugate fiber is preferably in the range of 50 to 1,000 μm, more preferably in the range of 80 to 500 μm. When the diameter of the conjugate fiber is less than 50 μm, the elastic force of the conjugate fiber portion itself used in the brush becomes too weak, and the cleaning effect is lowered due to the use. When the diameter of the conjugate fiber exceeds 1,000 μm, the elastic force of the composite fiber portion itself used in the brush becomes too strong, and although the shape of the annular wall and the groove at the tip end portion is different, there is a front end. The composite fiber portion of the root portion of the portion is strongly pressed to the side of the object to be cleaned, and it is easy to damage the object to be cleaned.

Further, in the brush material of the present invention, the longitudinal direction length of the conjugate fiber having the annular wall and the groove portion is preferably in the range of 0.5 to 10 mm. Since this length affects the performance of the annular wall having the dirt scraping performance as described above and the groove having the dirt catching performance, it may be appropriately set from the above range in accordance with the use.

Further, in the brush material of the present invention, a structure may be employed which has a facing wall which faces the groove and faces the annular wall, and the length of the composite fiber of the opposing wall The height in the side direction is higher than the height of the above annular wall. That is, in the inner diameter side of the fiber between the annular walls and the groove, there is a bamboo shoot-like or telescopic structure having a higher height of the opposing wall. If such a configuration is adopted, since the head can be formed Since the thin tapered shape is used as the entire front end portion of the wool material, it is possible to ensure the soft touch of the hair tip portion by the dirt scraping performance of the annular wall and the dirt trapping performance by the groove as described above. .

Further, in the brush bristle material of the present invention, the shape of the at least one annular wall extending may be various shapes, or a structure including an annular wall extending in a circular shape may be used, and the extension may be included. Any of the structures of the annular wall of a profiled shape other than a circle. In the case of an annular wall extending in a circular shape, an annular wall extending substantially in the same wall thickness to form a true circular shape, of course, includes an annular wall extending in a wavy shape or extending in the direction of extension. An annular wall with a varying thickness of the upper wall. Further, the annular wall extending in a shape other than a circular shape also includes a triangular or quadrangular shape, or an annular wall extending in the form of a polygonal shape or more, or an irregular shape extending beyond the angular shape. Annular wall.

Further, in the brush bristle material of the present invention, the cross-sectional shape of the entire conjugate fiber may be any form that is formed into a circular shape and formed into a polygonal cross-sectional shape other than a circular shape. By. It suffices to determine it according to the use, the form of use, the conditions of use, and the like.

Further, in the brush material of the present invention, the plurality of resin layers constituting the conjugate fiber are preferably concentric. If it is concentric, it may take the form of a concentric shape, and only one of the layers may be formed into a polygonal shape other than a circular shape or a shape of a cross-sectional shape. By forming a plurality of resin layers concentrically, the annular wall and the groove which are desired in the present invention can be easily formed by the dissolution treatment of the drug.

The present invention also provides a brush for at least a portion of the brush material of the present invention as described above. In particular, the brush of the present invention is suitable as a toothbrush or the like because it has the excellent dirt-scraping property of the annular wall formed at the front end portion of the wool material and the excellent dirt-trapping property by the groove as described above. Tongue brush, makeup brush, coating brush, etc.

Although the brush of the present invention differs depending on the application, the range of the hair length (the length from the root of the brush to the tip of the brush) of a preferred brush can be exemplified in the range of 1 to 50 mm. It is preferably in the range of 5 to 35 mm.

Thus, according to the present invention, it is possible to provide a brush material which exhibits excellent dirt scraping by an annular wall formed at the front end portion of the wool material and a groove formed on the inner side thereof. High performance sweep with performance and excellent dirt capture performance.

Further, according to the present invention, various brushes can be provided, and at least a part of the brush material as described above can be used, and in particular, a brush suitable for use as a toothbrush, a tongue brush, a makeup brush, a coating brush or the like can be provided.

1, 21‧‧‧ brush with wool

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‧‧ ‧ annulus

11‧‧‧ Brush with wool

12‧‧‧ toothbrush components

12a‧‧‧ head surface side members

12b‧‧‧ head back side member

13‧‧‧ toothbrush

14‧‧‧Planting pores

15‧‧‧ flat line

16‧‧‧through holes

17‧‧‧ hot ball

31, 41, 51, 61, 71, 81, 91, 101‧‧‧ brushed wool

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 walls

Fig. 1 is a schematic side view showing one end portion of the wool material of the embodiment of the present invention, and Fig. 1(B) is a schematic cross-sectional view taken along line BB of Fig. 1(A). Sectional view.

2(A) and 2(B) are schematic diagrams showing a method of planting a brush when a brush material is used for a toothbrush.

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

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

Fig. 5 (A) to (D) are schematic cross-sectional views showing various examples of various types of brush materials for the brush of the present invention.

Form of implementing the invention

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

Fig. 1 shows a brush bristle material 1 according to an embodiment (Embodiment 1) of the present invention, and Fig. 1(A) shows one end portion of the bristle material 1. As shown in Fig. 1(B), the brush material 1 is formed of a composite fiber 3 having a core-sheath cross-sectional structure including two or more types of resins having different drug dissolution rates (Fig. In the present embodiment, the plurality of resin layers 2a, 2b, 2c, and 2d formed by the resin of the two types are, in particular, the resin layers 2a and 2b which are concentrically arranged in the same thickness in the extending direction. , 2c, 2d. At one end portion or both end portions of the composite fiber 3 in the longitudinal direction (only one end portion of the wool material 1 is shown in FIG. 1(A)), at least one annular wall 4 and at least one groove 5 are formed, and the annular wall 4 is formed. Extending in the longitudinal direction of the composite fiber 3 and extending across the entire circumference in the direction along the outer circumferential 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 Extending 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 the present embodiment, the annular wall 4 is formed as a circular annular wall extending in the same thickness direction in the extending direction thereof, and the groove 5 is formed to have the same width along the annular wall inside the annular wall 4 4 extended annular grooves. The annular wall 4 is formed of a resin layer 2c which is insoluble in the dissolution process of the drug, and the groove 5 on the inner side is an annular space formed by appropriately dissolving the resin layer 2b in the drug dissolution treatment. Was formed. Further, in the present embodiment, the resin layer 2a is formed in the end portion of the wool material 1 so as to be formed in the chemical dissolution treatment without being dissolved, and the resin layer 2d is formed in the chemical dissolution treatment. A suitably dissolved annular space 7.

In the above-described drug dissolution treatment, for example, by alkali treatment, a plurality of resin layers formed of two or more types of resins having different dissolution rates of the above-described drugs (for example, a dissolution rate of alkali treatment) may be used, for example, The resin layer 2a, 2c is formed as nylon (Ny) (registered trademark) of a resin which is not dissolved by alkali, and a resin layer is formed as polybutylene terephthalate (PBT) which is a polyester resin which is dissolved by alkali. 2b and 2d, only the specified length of the end portion in the longitudinal direction of the conjugated fiber 3 is subjected to alkali treatment, and only the resin layers 2b and 2d at the end portions thereof are dissolved, thereby forming a layer as shown in Fig. 1(A). The end portion of the brush material 1 having the annular wall 4, the groove 5, the cylindrical wall 6, and the annular space 7.

In the brush material 1 , one end portion or both end portions of the conjugate fiber 3 having a core-sheath cross-sectional structure including a plurality of resin layers formed of resins having two different types of dissolution rates of the drug are used. On the top, using the drug to dissolve the treatment, so that the dissolution rate of the drug is slow (in In the above embodiment, the resin layer 2c is partially formed by the resin layer which is not dissolved by the alkali, and the annular wall 4 is formed. On the inner side, the resin layer 2b having a high dissolution rate of the drug is appropriately dissolved to form the groove 5. The annular wall 4 is annularly formed as an annular wall extending continuously over the entire circumference, and the annular wall 4 can exhibit a high edge effect when the dirt is scraped, and also has a high viscosity. Can show excellent scratching performance. The dirt scraped off by the annular wall 4 is collected by the groove 5 formed on the inner side thereof, and is captured by the groove 5, but the groove 5 is a ring extending across the entire circumference from the outer side. Since the wall 4 is surrounded by the structure, the dirt trapped in the groove 5 is not easily escaped, and is well maintained in the state of being caught in the groove 5. Therefore, the tip portion having the annular wall 4 and the groove 5 on the inner side thereof exhibits excellent cleaning properties.

The brush material 1 configured as described above is used for at least a part of various brushes. In general, as a method of planting a brush hair material into a brush constituting member, two representative methods are known. These two methods are used as a case of a toothbrush, and one side of FIG. Be explained.

Fig. 2(A) shows the toothbrush 13 in which the brush material 11 has been planted on the head of the toothbrush constituting member 12, and as a method of cultivating the brush material 11, as in the line aa of Fig. 2(A). The two methods shown in Figs. 2(B) and (C) of the enlarged cross-sectional view. In the method shown in Fig. 2(B), the folded brush hair material 11 is inserted into the planting hole 14, and the brush material 11 is fixed to the toothbrush constituent member 12 by a fixture called a flat wire 15. The finished toothbrush is often referred to as a flat wire toothbrush. In such a flat-line toothbrush, the both ends of the brush-making material 11 which is prepared in advance become a brush The tip of the hair. In the method shown in Fig. 2(C), one end portion of the brush material 11 is inserted through the through hole 16 of the head surface side member 12a of the toothbrush constituting member 12, so that the heating device (not shown) is penetrated. The end portion of the brush material 11 is formed into a block for preventing detachment or fixation called the hot ball 17, and then the head back side member 12b is joined to hide the hot ball 17, completing the toothbrush product. The finished toothbrush is often referred to as a flat wire toothbrush. In such a flat-line toothbrush, one end portion of the brush-making material 11 which is prepared in advance becomes the tip of the brush. Therefore, when the brush material 1 for a brush of the present invention is to be used for a flat toothbrush, the above-mentioned annular wall 4 and the groove 5 on the inner side thereof are formed at both ends of the brush material 1 for use in the case of no flat line. In the case of the toothbrush, the annular wall 4 and the groove 5 are formed at one end of the brush material 1 .

Fig. 3 is a view showing one end portion of the brush bristle material 21 according to another embodiment (Embodiment 2) of the present invention. In the present embodiment, the brush bristle material 21 is formed of a conjugate fiber 23 having a core-sheath cross-sectional structure, and the core-sheath cross-sectional structure includes two or more types which are arranged in a concentric shape and have different drug dissolution rates. A plurality of resin layers 22a, 22b, 22c, and 22d formed of a resin (a resin of two types in the drawing). At one end portion or both end portions of the conjugate fiber 23 in the longitudinal direction (only one end portion of the bristle material 21 is shown in FIG. 3), at least one annular wall 24 and at least one annular groove 25 are formed, and the annular wall 24 is formed. Extending in the longitudinal direction of the conjugate fiber 23 and extending all the way along the outer peripheral surface of the conjugate fiber 23, the annular groove 25 is adjacent to the annular wall on the inner side of the annular wall 24. 24, extending along the annular wall 24 and recessed from the front end of the annular wall 24 in the longitudinal direction of the conjugate fiber 23. In the present embodiment, the resin layers 22a and 22c are, for example, a base which is a solvent for dissolution. Further, a resin having a slow dissolution rate (for example, polybutylene terephthalate (PBT)) is used, and the resin layers 22b and 22d are, for example, a resin having a faster dissolution rate with respect to a base as a solvent for dissolution (for example, Polyethylene terephthalate (PET) is formed, and the annular wall 24 is formed by a resin layer 22c which is suitably left undissolved in the dissolution treatment of the drug, and the groove 25 is formed by the agent. In the dissolution treatment, the resin layer 22b is appropriately dissolved, and the cylindrical wall 26 which is a center portion of the opposing wall higher than the annular wall 24 is a resin which is appropriately left by being dissolved in the drug dissolution treatment. The layer 22a is formed, and the annular space 27 is formed by appropriately dissolving the resin layer 22d in the drug dissolution treatment. Further, the cylindrical wall 26 at the center portion and the annular wall 24 having a height lower than the height thereof have a bamboo shoot shape or a telescopic shape, and are formed into a thin tapered shape as the entire front end portion of the hair material 21. shape.

In the same manner as in the first embodiment, the brush material 21 having a tapered shape in the tip end portion exhibits excellent dirt scraping performance by the annular wall 24 and The groove 25 exhibits excellent cleaning performance and exhibits excellent cleaning performance. Compared with the first embodiment, the tip end portion is formed into a tapered shape, so that it is also finer (for example, between teeth). It can provide excellent cleaning results.

Regarding the first embodiment and the second embodiment described above, the representative features applied to the toothbrush are summarized in Table 1. In the first embodiment, the annular layer is formed of a resin layer containing nylon (Ny) (registered trademark), and the groove is formed of a resin layer of polybutylene terephthalate (PBT). In the second embodiment, the inclusion is included. Resin layer of polybutylene terephthalate (PBT) forms a ring The wall is formed of a resin layer of polyethylene terephthalate (PET) and formed by alkali treatment. The characteristics of the brush material for the brush in Table 1 are shown as the contrast characteristics of the brush material formed by the monofilament of a single material of nylon (registered trademark), which is caused by the tip of the brush material. The dirt scraping effect and the dirt trapping effect are shown as the comparative characteristics with the wool material described in the above-mentioned Patent Document 1. The ○ in Table 1 indicates that it has the same or higher characteristics as the comparative object, and the ◎ indicates that it is remarkably superior to the comparative object.

The brush bristle of the present invention can take various forms in addition to the above-described first and second embodiments. In FIGS. 4 and 5, various forms are exemplified in the cross section of the conjugate fiber.

In the brush bristle material 31 shown in Fig. 4(A), a composite fiber 33 including a resin layer 32a disposed at a center portion of a concentric shape, a resin layer 32b on the outer side, and a resin layer 32c on the outermost layer is formed. And the same 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 on the inner side of the annular wall 34. The brush material 41 shown in Fig. 4(B) is formed of a resin layer 42a including a central portion disposed concentrically, a resin layer 42b on the outer side, a resin layer 42c on the outer side, and a resin on the outermost layer. The composite fibers 43 of the layer 42d are simultaneously formed into the annular walls 44, and the resin layers 42a and 42c are formed as the grooves 45 on the inner side of the respective annular walls 44. The brush material 51 shown in Fig. 4(C) is formed of a resin layer 52a including a central portion arranged concentrically, a resin layer 52b on the outer side, a resin layer 52c on the outer side, and a resin on the outer side thereof. The layer 52d, the resin layer 52e on the outer side, and the composite fiber 53 of the outermost resin layer 52f, and at the same time, the resin layers 52c, 52e are each formed as an annular wall 54, and the resin layers 52b, 52d are formed as respective annular walls. The groove 55 on the inner side of the groove 54 and the resin layer 52a at the center portion are formed as a cylindrical wall 56 at the center. In the brush bristle 61 shown in Fig. 4(D), a composite fiber 63 including a resin layer 62a disposed at a center portion of a concentric shape, a resin layer 62b on the outer side, and a resin layer 62c at the outermost layer is formed. At the same time, the resin layer 62c of the outermost layer is formed as an annular wall 64, the resin layer 62b is formed as a groove 65 on the inner side of the annular wall 64, and the resin layer 62a at the center is formed into a cylindrical wall 66 at the center.

Further, in the brush bristle material 71 shown in Fig. 5(A), a composite fiber including the resin layer 72a disposed at the center portion of the concentric shape, the resin layer 72b on the outer side, and the resin layer 72c at the outermost layer is formed. 73. However, the resin layer 72b is formed into a triangular resin layer. The resin layer 72b is formed as an annular wall 74, and the central resin layer 72a is formed as a groove 75 on the inner side of the annular wall 74. Brush hair shown in Figure 5 (B) The material 81 is a composite fiber 83 including a resin layer 82a disposed at a concentric central portion, 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. However, the resin layers 82b and 82d are formed as a resin layer extending in a wave shape to form a ring shape, and the resin layers 82b and 82d are each formed as an annular wall 84, and the resin layers 82a and 82c on the inner side are formed as respective A groove 85 on the inner side of the annular wall 84. In the brush material 91 shown in Fig. 5(C), a resin layer 92a including a central portion disposed concentrically, a resin layer 92b on the outer side, a resin layer 92c on the outer side, and a resin on the outer side thereof are formed. The layer 92d and the conjugate fiber 93 of the outermost resin layer 92e are formed in a petal shape in which the thickness of the resin layer changes in the direction in which the ring extends, and the resin layers 92b and 92d are each formed as The annular wall 94 has resin grooves 92a and 92c on the inner side thereof formed as grooves 95 on the inner side of the respective annular walls 94. In the brush bristle material 101 shown in Fig. 5(D), a composite fiber 103 including a resin layer 102a disposed at a concentric central portion, a resin layer 102b on the outer side, and a resin layer 102c on the outermost layer is formed. However, the cross-sectional shape of the composite fiber 103 and each of the resin layers 102a, 102b, and 102c is formed into a hexagonal shape, and the outermost resin layer 102c is formed as an annular wall 104, and the resin layer 102b is formed inside the annular wall 104. The groove 105 and the resin layer 102a at the center portion are formed as a cylindrical wall 106 at the center portion.

As described above, the composite fiber having a core-sheath cross-sectional structure including a plurality of resin layers in the present invention can adopt various cross-sectional shapes, and can be optimally designed according to the use or purpose of use.

[Examples]

Hereinafter, an embodiment of the present invention will be described.

Examples 1 to 11 and Comparative Example 1 [Production of brush with wool]

As a raw material, polybutylene terephthalate (PBT, "Toraycon" (registered trademark) 1100SW, manufactured by Toray Industries, Inc.) and polyethylene terephthalate (PET, Toray Co., Ltd.) are used. T755M), Nylon 610 (Ny610, "Amilan" (registered trademark) CM2001, manufactured by Toray Industries, Inc.), thermoplastic polyamine elastomer (Ny11-PTMG (polybutylene glycol), "Pebax" manufactured by ARKEMA) (registered trademark) 72R53), polybutylene naphthalate (PBN, manufactured by Toyobo Co., Ltd., AE-500) was prepared by drying under the recommended conditions. The core component, the resin type of the sheath component, the area ratio of the core component to the sheath component, the number of the resin layers, and the thickness (representative value) of the resin layer are as shown in Table 2, and have a core sheath cross section including a plurality of resin layers. The constructed composite fiber is melt spun. Here, the core component refers to a component of the resin layer disposed at the center of the fiber cross section, and the sheath component refers to a component of the resin layer disposed outside the center of the fiber cross section. The structure of the resin layer in the cross section of the fiber is a repetitive structure in which the core component, the sheath component 1, the sheath component 2, the core component, and the ‧ ‧ are sequentially formed from the center.

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

The fibers were bundled into a linear shape having a beam diameter of 45 mm and packaged, and then cut into an arbitrary length. Next, the bundle of the composite fibers is immersed in the heated caustic soda solution in a state where the cut end faces are exposed, and both end portions are dissolved and removed to form an annular wall. The length in the longitudinal direction of the portion having the annular wall and the groove is controlled by changing the immersion time for the caustic soda solution. Table 2 shows the characteristics of the obtained brush material.

In the same manner as described above, the PBT fiber was immersed in a caustic soda solution in the same manner as described above, and a brush-like felt material in which the both end portions were processed into a tapered shape was prepared.

[Toothbrush making]

The brush material obtained by the above method is attached to the flat wire type hair-planting machine, and the specified number of roots (about 15 to 40 pieces) is sorted and folded into the planting hole of the toothbrush head together with the flat wire. In the case of a toothbrush head, a hair transplanting portion having a diameter of 1.5 mm and having 8 rows and 4 rows of hair-planting portions was used. Table 2 shows the hair length (mm) and the number of hairs (roots/holes) of the toothbrushes produced in the examples and comparative examples.

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

[cleaning evaluation]

Artificial plaque prepared by NISSIN was applied to the dentition model and allowed to dry for 5 minutes or more. From the top of the dentition model, the water-containing toothbrush was pressed with a load of 230 g, and washed in a direction along the dentition with a stroke width of 70 mm and a stroke speed of 180 mm/sec. In the evaluation of the tooth surface, the upper side of the molar portion of the dentition model was used, and the outer portion of the front tooth portion was used for the evaluation between the teeth. The dirt residue will be washed 20 times with a nylon toothbrush The retention condition is used as a reference, and the cleaning performance is calculated from the number of times of washing up to the reference by the following formula.

Sweepability = 20 ÷ (number of washes up to the baseline)

[External opening durability evaluation]

For the toothbrush, a load of 230 g was applied perpendicularly from the back side of the sliding surface so that the temperature of the water was 37 ° C, so that the wave plate made of stainless steel had a stroke width of 70 mm and a stroke speed of 180 mm/sec in the longitudinal direction of the toothbrush. The sliding motion was performed 1000 times, and the hair opening ratio (%) of the brush portion was measured. When the lateral width of the brush portion in the initial state is Amm and the lateral width after sliding is Bmm, the method for calculating the hair opening ratio is (B-A) / A × 100%.

[Evaluation of hair cracking durability]

The cracking of the hair tip was observed every 50 times of the number of times of washing, and the number of times the hair material having cracked hair was five was recorded under the same conditions as the evaluation of the above-described hair opening durability.

[Tactile ‧ foaming evaluation]

20 adults are required to use the toothbrush for 30 days, and the following criteria are required to be answered, and the average number of points is taken as the evaluation value.

[Industry use possibility]

The present invention is applicable to all brushes, and is particularly suitable for a toothbrush, a tongue brush, a makeup brush, a coating brush, and the like.

1‧‧‧ Brush with wool

2a, 2b, 2c, 2d‧‧‧ resin layer

3‧‧‧Composite fiber

4‧‧‧ annular wall

5‧‧‧ditch

6‧‧‧ cylindrical wall

7‧‧‧Circle space

Claims (9)

A brush material having a one end portion or both end portions in a longitudinal direction of a composite fiber having a core-sheath cross-sectional structure including a plurality of resin layers formed by resins having different dissolution rates of a drug. Forming at least one annular wall extending in the longitudinal direction of the composite fiber and extending across the entire circumference in the direction of the outer peripheral surface of the composite fiber, the groove being in the ring shape The inner side of the wall abuts 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 brush for a brush according to claim 1, wherein the number of the plurality of resin layers is in the range of 3 to 6 layers. The brush material according to claim 1, wherein a thickness of one of the resin layers in the cross section of the composite fiber is in the range of 10 to 300 μm. The brush bristle according to claim 1, wherein the length of the longitudinal direction of the conjugate fiber having the annular wall and the groove is in the range of 0.5 to 10 mm. A brush material according to claim 1, comprising a facing wall which is interposed between the grooves and the annular wall, wherein the conjugate fiber has a height in a longitudinal direction which is higher than the annular wall The height is higher. A brush bristle according to claim 1, wherein the at least one annular wall comprises an annular wall extending in a circular shape. A brush bristle according to claim 1, wherein the at least one annular wall comprises an annular wall extending in a shape other than a circular shape. A brush material according to claim 1, wherein the plurality of resin layers are set to be concentric. A brush for use in at least a portion of the brush material according to any one of claims 1 to 8.