JPWO2017130900A1 - Hair for brush and brush using the same - Google Patents

Abstract

A gear type cross section which is formed of at least two types of resin phases, and at least one type of resin phase is formed in a resin phase portion arranged in a gear type having 3 to 32 teeth with respect to the other resin phase in the fiber cross section A bristle for brush characterized by using a composite fiber, and a brush using the same. For a brush that can achieve both a good balance between the excellent cleanability of the gap area of the object to be cleaned and the excellent massage effect on the object to be cleaned, and that it is possible to obtain a unique touch etc. A hair material and a brush using the same can be provided.

Description

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

  BACKGROUND ART Conventionally, a technique using a monofilament of synthetic fiber as a bristle material for a brush is widely known. In a brush using such a brush hair material, for example, a toothbrush, the effect of cleaning the teeth by the hair tip and the massage effect such as soft touch feeling and gum so as not to damage the object to be cleaned are excellent in a well-balanced manner. Is desired.

  However, it may be difficult to satisfy such a requirement when the brush bristle material is formed of monofilaments of a single material up to the bristle tips. That is, if the bristle material is made of a single material monofilament, even if the bristles are made thick, the height of the brush becomes strong and the massage effect such as cleaning effect and gums on the flat surface of teeth can be enhanced. However, on the contrary, there is a possibility that the cleaning effect between the teeth may be reduced, the tactile sensation to the gums and the like may become too strong, and it may be difficult to obtain the soft tactile sensation that makes it difficult to scratch the gums and the like.

  In addition, in the brush made of a single monofilament material, even if the brush bristle material is made thinner, the interdental cleaning effect can be enhanced, but the waist of the brush bristle material becomes weak over the entire length and Etc., and the durability of the hair itself may be reduced. In addition, in order to increase the cleaning effect between teeth etc., it is usually required to make the tip of the hair soft, but doing so is good for people whose gums are weakened by periodontal disease etc. There may be more people who feel that the hair of their hair ends are lacking.

  The cleaning and cleaning brushes in other fields generally have similar problems.

  Therefore, sea-island composite fiber is used as the brush hair material in order to balance the excellent cleaning effect and the property that the object to be cleaned is not easily damaged, and the sea-island component is used at the root of the hair material used in the brush. There has been proposed a brush hair material having an integrated composite fiber structure, and a structure in which a large number of island portions are exposed and divided at the tip end portion (Patent Document 1). By using this brush bristle material, it becomes possible to balance the excellent cleaning effect and the feature that the object to be cleaned is not damaged in a well-balanced manner, and furthermore, the thin island fiber at the exposed tip portion provides a soft touch feeling. It is possible to get However, in the brush bristle material proposed in Patent Document 1, an excellent cleaning effect between teeth etc. and an excellent massage effect such as gum by keeping hairs of hair tips above a certain level are well-balanced. It is difficult to make it compatible.

  By the way, apart from the above-mentioned problems with the conventional brush hair material, recently, a manufacturing technology of a sea-island composite fiber capable of forming the distribution state of the island and the cross sectional shape of the island in various forms has been proposed (Patent documents 2 to 4). According to this proposed technology, in the sea-island composite fiber, the size, arrangement, cross-sectional shape, arrangement density, etc. of the island with respect to the sea can be designed substantially freely, and various demands in various fields can be met. When possible, there is great hope.

  Also, conventionally, composite fibers in which different resin phases are arranged radially in the cross section are also known (Patent Documents 5 to 8). However, in these Patent Documents 5 to 8, attention has not been given to the development of the brush hair material, and the problems with the conventional brush hair materials as described above are not taken into consideration, only by the knowledge of the composite fibers described in these patent documents. It does not lead to the elimination of

  Furthermore, conventionally, in the fiber cross section, a composite fiber in which one of the fiber components is formed into a plurality of radially branched shapes and a special cross-section fiber of a single component are also known (Patent Documents 9 to 13) . However, even in these Patent Documents 9 to 13, attention is not focused on the development to the bristle material for brushes, and the conventional brush as described above is obtained only with the knowledge of the composite fiber and the special cross-section fiber described in these patent documents. It does not lead to the solution of the problem concerning the hair material.

Unexamined-Japanese-Patent No. 3-99604 JP, 2011-174215, A JP, 2012-127022, A JP, 2013-14872, A JP-A-8-158228 JP-A-8-325827 JP, 2000-17554, A Japanese Patent Application Publication No. 2003-293219 JP, 2008-7902, A JP 2004-339616 A JP, 2004-308021, A JP 2004-52161 A JP, 2013-36131, A

  Therefore, the subject of the present invention focuses on the problems in the conventional brush hair material and focuses on the manufacturing technology of sea-island composite fiber which can design the cross-sectional form recently proposed substantially freely. Provided is a suitable hair material, in particular, a hair material for a brush capable of achieving a balance between the excellent cleaning property of the clearance area of the object to be cleaned and the excellent massage effect on the object to be cleaned, and the brush using the same. It is to do.

  In order to solve the above problems, the bristle material for brushes according to the present invention is formed of at least two types of resin phases, and at least one of the resin phases has three to three teeth per fiber cross section with respect to the other resin phases. It is characterized in that it is configured using a gear type cross-section composite fiber formed in a resin phase portion arranged in a gear type of 32.

  In the brush bristle material according to the present invention, since the composite fiber constituting the bristle material is formed of at least two types of resin phases, at least two types of composite fibers can be used without mixing and spinning. It becomes possible to construct a hair material that exhibits a coefficient of friction, and it is possible to configure a hair material that is excellent in unique touch feeling and polishing comfort, and by being formed of different resin phases It also makes it possible to construct an excellent hair material. The hair material is formed in a resin phase portion in which at least one resin phase out of at least two types of resin phases is disposed in a gear type having 3 to 32 teeth with respect to the other resin phase in the fiber cross section. Since it is constructed using gear type cross section composite fibers, it is possible to construct various types of bristle tips suitable for brushes using the resin phase portions arranged in the gear type at the bristle tips of the hair material Become. For example, the outer peripheral surface of the bristle is formed in a form in which a resin phase portion arranged in a gear shape and a resin phase portion having a different coefficient of friction are alternately arranged, or a resin phase portion arranged in a gear shape Leave the remaining resin phase part at the tip of the hair, and form the space between resin phase parts arranged in the gear type in the circumferential direction in a space where dirt can be captured, or conversely, place it in the tip of the tip It becomes possible to remove the resin phase part which has been removed and to form the removed gear-type resin phase part in a space capable of capturing dirt while leaving the other resin phase parts, and various types suitable for brushes It becomes possible to configure the tip form of As a result, it is also possible to configure a brush hair material capable of achieving a good balance between the excellent cleanability of the gap portion of the object to be cleaned and the excellent massage effect on the object to be cleaned.

  In the brush bristle material according to the present invention, the width of the tooth portion of the resin phase portion disposed in the gear type in the fiber cross section of the gear type cross-section composite fiber is preferably in the range of 10 to 300 μm, More preferably, it is in the range of 15 to 150 μm. When the width of the tooth portion is less than 10 μm, when using the difference in the coefficient of friction with other resin phase portions on the outer peripheral surface, when leaving only the gear type resin phase portion at the tip, stain the gear type resin phase portion In any case of forming in the space for use, it is too narrow for practical use, and if it exceeds 300 μm, the width may be too wide and it may be difficult to form a desired hair tip.

  In the bristle material for a brush according to the present invention, the diameter of the gear type cross-section conjugate 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 stiffness of the composite fiber part itself when used in a brush becomes too weak, and in some applications, the cleaning effect may be reduced. When the diameter of the composite fiber exceeds 1,000 μm, the stiffness of the composite fiber part itself when used in a brush becomes too strong, and although depending on the form of the tip part forming the tip, the tip part is cleaned There is a possibility that the object to be cleaned may be easily damaged by being strongly pressed to the object side.

  Further, in the bristle for brush according to the present invention, as described later, bristle tips of various specific forms are formed at one end or both ends in the fiber longitudinal direction of the bristle. The length of the direction is preferably in the range of 0.5 to 10 mm, more preferably in the range of 1 to 5 mm. If the length of the tip of the hair is less than 0.5 mm, it is difficult to obtain an excellent cleaning property for fine parts such as interdental space by the tip of the hair, and it is also difficult to obtain a good soft touch. If the length of the tip is longer than 10 mm, there is a risk that the tip that tends to weaken the waist becomes too long, and the tip is deformed too much and the cleaning effect by the tip (for example, dirt) There is a risk that the massage effect such as the entanglement effect) or gums may be insufficient.

  Further, in the brush bristle material according to the present invention, at least one end in the fiber longitudinal direction of the brush bristle material can be formed into a tapered taper shape, and the outer diameter in the cross section is substantially up to the tip of the bristle material. It is also possible to form it in the same shape with the same diameter. If it is formed in a tapered shape, it is easy to obtain excellent cleaning performance for finer parts, and if it is formed in a shape which is maintained at substantially the same diameter up to the tip, a space for scraping and catching dirt or It becomes easier to form the groove.

  In the brush bristle material according to the present invention, resin phases different in various characteristics can be adopted as the at least two resin phases. For example, a form in which the at least two resin phases are composed of resin phases having different friction coefficients, a form in which the at least two resin phases are composed of resin phases having different color tones, and the at least two resin phases dissolve each other The form etc. which consist of a resin phase from which speed differs can be employ | adopted.

  In the case of at least two resin phases different in drug dissolution rate from each other, the resin phase portion consisting of at least one resin phase among them is the gear type or the female type of the gear type at at least one end in the fiber longitudinal direction. It is possible to form in the form of protruding in the longitudinal direction of the fiber in the form of. Examples of various forms will be described later. Further, in this case, it is possible to form a groove formed between the adjacent resin phase portions in the resin phase portion protruding in the longitudinal direction of the fiber, which is recessed in the longitudinal direction of the fiber. Such a groove is preferably formed in a groove having a depth of 0.1 mm or more, more preferably in a groove having a depth of 0.5 mm or more, and still more preferably in a groove having a depth of 1 mm or more. When such a groove is formed, it is possible to improve the performance of removing dirt from the tip of the hair and the capture performance of the removed dirt.

  In the embodiment in which at least two resin phases consist of two or more resin phases having different drug dissolution rates, the type of the resin is not particularly limited. For example, a composite consisting of two resin phases having different drug dissolution rates In the case of fibers, it can be exemplified that one resin phase is made of polyester resin and the other resin phase is made of resin whose drug dissolution rate is slower than that of the polyester resin. More specifically, the one resin phase is polybutylene terephthalate (PBT), the other resin phase is nylon (registered trademark) (Ny), or the one resin phase is polyethylene terephthalate (PET), the other is It can be exemplified that the resin phase of is composed of polybutylene terephthalate (PBT). The resin phase portion of the gear type can be formed of either a resin having a faster drug dissolution rate or a resin having a slower drug dissolution rate.

  Further, in the bristle material for a brush according to the present invention, the cross-sectional outer shape of the composite fiber including the above-mentioned gear type resin phase portion is formed substantially in a circular shape so as to illustrate various forms later. However, it is also possible to set it to any shape other than circular. The cross-sectional outer shape can be arbitrarily set according to the application and the purpose of use.

  The present invention also provides a brush in which the hair material for a brush according to the present invention as described above is used at least in part. In particular, with the brush according to the present invention, it is possible to achieve a well-balanced balance between the excellent cleaning performance of the clearance area of the object to be cleaned and the excellent massage effect on the object to be cleaned. Since possible hair materials are used, they are particularly suitable as various brushes such as toothbrushes and brushes for precision cleaning.

  In such a brush according to the present invention, although depending on the application, a range of 1 to 50 mm is exemplified as a preferable range of brush hair length (length from brush root to hair tip), more preferably , 5 to 35 mm.

  As described above, according to the present invention, it is possible to achieve a good balance between the excellent cleaning property of the gap portion of the object to be cleaned and the excellent massage effect on the object to be cleaned, and to obtain a unique feeling and the like. It is possible to provide a brush bristle material that is superior in appearance and appearance.

  Further, according to the present invention, it is possible to provide various brushes using at least a part of the bristle material for a brush as described above, and in particular, a brush suitable as a toothbrush, a brush for precision cleaning, etc. can be provided.

The hair material for brushes which concerns on one Embodiment of this invention is shown, FIG. 1 (A) is a schematic side view of the end part of a hair material, FIG. 1 (B) is a BB line of FIG. 1 (A). FIG. It is a schematic block diagram which shows the flocking method at the time of using the hair material for brushes in a toothbrush. It is the schematic side view and schematic perspective view of the one end part of the hair material which shows the other various embodiment of the hair material for brushes which concerns on this invention. It is a schematic cross-sectional view which shows the further another various embodiment of the hair material for brushes which concerns on this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 shows a brush bristle 1 according to an embodiment of the present invention, and FIG. 1 (A) shows one end of the bristle 1. As shown in FIG. 1 (B), the brush bristles 1 are formed of two resin phases 2 and 3 (in the present embodiment, two resin phases having different color tones or / and friction coefficients). One of the resin phases 2 is arranged in a gear shape having 3 to 32 teeth (in the illustrated example, 4 teeth and an equal circumferential angle of 90 °) with respect to the other resin phase 3 in the fiber cross section. It is comprised using the gear type cross-section composite fiber 4 formed in the resin phase part. For example, resin phases 2 and 3 are both formed of polybutylene terephthalate (PBT), and have different color tones or / and friction coefficients. The widths W1 and W2 of the tooth portions of the resin phase 2 portion disposed in the gear type in the fiber cross section of the gear type cross section composite fiber 4 are set in the range of 10 to 300 μm, preferably in the range of 15 to 150 μm . The widths W1 and W2 of the teeth may be the same or may be different from each other. In particular, the gear type cross-section composite fiber 4 of this form should be designed substantially freely in size, arrangement, cross-sectional shape, arrangement density, etc. of the island with respect to the sea as described in Patent Documents 2 to 4 mentioned above. Can be intentionally created using techniques that are capable of

  In the present embodiment, at least one end portion in the fiber longitudinal direction of the brush bristle material 1 is formed in a tapered shape. The tapered portion 5 can be formed, for example, by sequentially dissolving a predetermined long portion of one end of the hair material 1 by alkali treatment, or by mechanical polishing. When the tapered portion 5 is formed by dissolution or mechanical polishing by alkali treatment, the respective resin phases 2 and 3 may be formed, for example, of the same polyester resin having different color tone or / and friction coefficient, for example, color tone or / And the coefficient of friction may be made of polybutylene terephthalate (PBT). In addition, the form which does not form the taper taper part 5 is also possible, and in that case, the gear type cross-section composite fiber 4 of a predetermined form will be extended to the front-end | tip of the bristle of brush for substantially the same diameter.

  The bristle material 1 for brushes comprised as mentioned above is used at least in part for preparation of various brushes. In general, two methods are typically known as methods for flocking a brush material to a brush component, and these two methods are illustrated in the case of use for a toothbrush as an example. This will be described with reference to FIG.

  FIG. 2A shows a toothbrush 13 in which the bristle material 11 for brush is flocked on the head portion of the toothbrush component 12. As a method for flocking the bristle material 11 for brush, a − of FIG. There are two types of methods as shown in FIGS. 2B and 2C, which are enlarged cross-sectional views taken along the line a. In the method shown in FIG. 2 (B), the brush hair material 11 folded in half is inserted into the flocked hole 14 and the brush hair material 11 is fixed to the toothbrush component 12 with a fixing tool called flat line 15. . The finished toothbrush is usually referred to as a flat line toothbrush. In such a flat-lined toothbrush, both ends of the bristle material 11 for brushes produced previously become the bristles of a brush. In the method shown in FIG. 2C, one end of the brush bristle 11 is inserted through the through hole 16 of the head surface side member 12a of the toothbrush component 12 and the end of the brush bristle 11 inserted. A heating device (not shown) is applied to form a lump for preventing or fixing, which is referred to as a burning ball 17. Thereafter, the head back surface side member 12b is joined to hide the burning ball 17, and a toothbrush product is completed. Let The finished toothbrush is usually referred to as a non-linear toothbrush. In such a non-flat brush, one end of the brush bristle material 11 prepared in advance is the bristle tip of the brush. Therefore, in the case where the bristle material 1 for a brush according to the present invention is used for a flat wire toothbrush, the above-described tapered portion 5 is formed at both ends of the bristle 1 for a brush. In the case of using it, the tapered portion 5 is formed at one end of the brush bristles 1.

  In the brush using the hair material 1 for brushes according to the above-described embodiment, as described above, since the composite fiber 4 constituting the hair material 1 is formed of two types of resin phases 2 and 3, no mixing is performed. Even by using this composite fiber 4, it becomes possible to configure the hair material 1 that develops two types of color tone and / or friction coefficient, and to configure the hair material 1 excellent in unique touch feeling and polishing comfort While becoming possible, a stripe pattern appears on the outer peripheral surface including the tapered portion 5 by forming the outer peripheral surface with different resin phases 2 and 3, and the hair material 1 having an excellent appearance in appearance is configured. It will be possible to And in the hair material 1, the resin phase 2 of the two resin phases 2 and 3 is arranged in a gear type having 4 teeth with respect to the other resin phase 3 in the fiber cross section, so By using two parts of the resin phase disposed, it becomes possible to configure various tip forms suitable for a brush (in the above embodiment, the form in which the color tone and the coefficient of friction alternately change in the circumferential direction) It becomes possible to obtain excellent design and unique excellent touch.

  In the bristle material according to the present invention, a gear type cross section in which at least one resin phase is formed in a resin phase portion arranged in a gear type having 3 to 32 teeth with respect to the other resin phase in the fiber cross section As long as it is constructed using composite fibers, various forms can be taken. Various forms are illustrated in FIG.

  In the bristle material 21 for brushes shown in FIG. 3 (A1) and (A2), a gear type resin phase 22 (for example, nylon (eg, nylon A gear type cross-section composite fiber 24 composed of a resin phase consisting of Ny) and another resin phase 23 dissolved by alkali (for example, a resin phase consisting of polybutylene terephthalate (PBT)) There is. By applying an alkali treatment to a predetermined long portion in the longitudinal direction of the fiber at the tip of the hair 21, only the resin phase 23 as a sea component is dissolved and the gear type resin phase 22 is left undissolved The form shown in the figure can be configured in which the gear type resin phase 22 protrudes in the longitudinal direction of the fiber at the tip end. In the bristle material 31 for brushes shown in FIGS. 3 (B1) and 3 (B2), a gear type resin phase 32 with four teeth in which two types of resin phases 32, 33 are dissolved by a drug, for example, alkali Constructed using a gear-shaped cross-section composite fiber 34 composed of a resin phase composed of butylene terephthalate (PBT) and another resin phase 33 not dissolved by alkali (for example, a resin phase composed of nylon (registered trademark) Ny) There is. By applying an alkali treatment to a predetermined long portion in the fiber longitudinal direction at the tip of the hair material 31, only the gear type resin phase 32 as an island component is dissolved and the resin phase 33 is left undissolved It is possible to form the illustrated tip portion in which the dissolved gear type resin phase 32 portion is formed in the space portion, and the space portion is formed as the groove 35 recessed in the fiber longitudinal direction between the adjacent resin phase 33 portions. In the bristle material 41 for brushes shown in FIG. 3 (C1) and (C2), the two resin phases 42 and 43 consist of resin phases having different drug dissolution rates, for example, four teeth having a slower alkali dissolution rate. A gear comprising a gear type resin phase 42 (for example, a resin phase consisting of polybutylene terephthalate (PBT)) and another resin phase 43 having a higher alkali dissolution rate (for example, a resin phase consisting of polyethylene terephthalate (PET)) It is configured using a mold section composite fiber 44. By gradually applying an alkali treatment to a predetermined long portion in the fiber longitudinal direction at the tip of the hair material 41, the other resin phase 43 having a higher dissolution rate is completely dissolved by a predetermined length, and the dissolution rate is increased. The tip portion of the figure can be configured by dissolving the slower gear-type resin phase 42 so that the dissolution proceeds toward the tip end while leaving a gear shape having a tapered shape as a whole. In the bristle material 51 for brushes shown in FIG. 3 (D1) and (D2), the two resin phases 52 and 53 consist of resin phases different in drug dissolution rate from each other, and for example A gear comprising a gear-type resin phase 52 (for example, a resin phase consisting of polyethylene terephthalate (PET)) and another resin phase 53 having a slower alkali dissolution rate (for example, a resin phase consisting of polybutylene terephthalate (PBT)) It is configured using a mold cross-section composite fiber 54. By gradually applying alkali treatment to a predetermined long portion in the longitudinal direction of the fiber at the tip end of the hair material 51, the gear type resin phase 52 having a higher dissolution rate is completely dissolved for a predetermined length and dissolved. The resin phase 52 portion of the gear type is formed in the space portion, and the space portion is formed as a groove 55 recessed in the longitudinal direction of the fiber between the adjacent resin phase portions 53, and the other resin phase 53 portion having a slower dissolution rate The tip of the figure can be configured by leaving the form of a tapered shape as a whole while dissolving so that dissolution proceeds toward the tip side.

  Further, in the present invention, various forms can be adopted as a cross-sectional form of the gear type cross-section composite fiber used for the construction of the bristle for brush. Various forms are illustrated in FIG.

  In the gear type cross section composite fiber 61 for bristle material construction for brushes shown in FIG. 4A, the gear type resin phase 62 out of the two types of resin phases 62 and 63 has six teeth and a circumferential angle of 60 degrees. It is composed of resin phases evenly distributed. In the gear type cross section composite fiber 71 for bristle material construction for brushes shown in FIG. 4 (B), the gear type resin phase 72 out of the two types of resin phases 72 and 73 has 3 teeth and has a circumferential angle of 120 degrees. The center portion of the gear mold is formed in a resin phase formed in a circularly expanded portion 74. In the gear type cross section composite fiber 81 for bristle material construction for brushes shown in FIG. 4C, the gear type resin phase 82 out of the two or more types of resin phases 82 and 83 has three teeth and the circumferential angle is 120 degrees. And the center part of the gear mold is formed in the resin phase formed in the circularly expanded portion 84, and another resin phase 85 is formed in the center of the expanded portion 84. Are placed (a total of 3 resin phases). In the gear type cross section composite fiber 91 for bristle material construction for brushes shown in FIG. 4D, the gear type resin phase 92 out of the two types of resin phases 92 and 93 has eight teeth and the circumferential angle is 45 degrees. It is composed of resin phases evenly distributed. In the gear type cross-section composite fiber 101 for bristle material construction for brushes shown in FIG. 4E, the gear type resin phase 102 out of the two types of resin phases 102 and 103 has 16 teeth and the circumferential angle is 22.5. It is comprised in the resin phase equally distributed by the degree. In the gear type cross-section composite fiber 111 for bristle material construction for brushes shown in FIG. 4F, the gear type resin phase 112 out of the two types of resin phases 112 and 113 has a larger number of teeth in the circumferential direction. The resin phase is equally distributed. Thus, various cross-sectional forms can be taken, and forms other than the illustrated example can also be taken. These forms can be designed optimally according to the application and purpose of use.

  Representative features of the brush bristle material according to the present invention as applied to a toothbrush are summarized in Table 1 for the various embodiment examples as described above or those similar to them. In Embodiment 1, a hair tip having two types of color tone and / or coefficient of friction is obtained, and a polishing feeling, a unique touch, and an excellent appearance (design) of a stripe tone are obtained. In the second embodiment, in addition to the performance in the first embodiment, the cleanability to a fine site such as interdental space can be further improved. In the third to fifth embodiments, an excellent massage effect can be obtained, and the cleaning property can be further improved also on the tooth surface and the like, and the tip portion excellent in the edge effect (scratching and catching of dirt) can be obtained. In particular, in the fourth embodiment, dirt is scraped off and the tip end is excellent in the capture effect. In the groove forming type as in the fourth embodiment, for example, when cooling is performed to prevent the friction material from becoming high temperature, a high cooling effect can be obtained. In addition, (circle) in Table 1 has shown having a characteristic equal to or more than contrast object, and (double-circle) has shown that it is remarkably excellent compared with contrast object.

Hereinafter, examples of the present invention will be described.
Examples 1 to 6, Comparative Example 1
[Preparation of hair for brush]
As raw materials, polybutylene terephthalate (PBT, manufactured by Toray Industries, Inc., “Trecon” (registered trademark) 1100 SW), polyethylene terephthalate (PET, manufactured by Toray Industries, Inc., T755M), nylon 610 (Ny610, manufactured by Toray Industries, Inc., "Amilan" (registered trademark) CM2001), a thermoplastic polyamide elastomer (Ny11-PTMG (polytetramethylene glycol), "Pebax" (registered trademark) 72R53 manufactured by Arkema Co., Ltd.) was dried and prepared under the recommended conditions. The composition of each resin layer, the color tone, and the shape of the tooth portion were as shown in Table 2, and a gear-shaped cross-section composite fiber was melt-spun. Here, in the resin layer, the resin layer arranged in a gear shape is a layer, and the other resin layers are b layers.

  After the solidified fibers are cooled and solidified in water, the first stage is drawn in warm water at 60 ° C., and the second stage is drawn 4.5 times in a 120 ° C. dry atmosphere, and then relaxation heat set in a dry heat atmosphere To obtain a composite fiber. The fibers were bundled in a straight line with a bundle diameter of 45 mm and packaged, and then cut into an arbitrary length.

  Then, the tip of the hair was formed. In Examples 1 to 4 in which the hair tips were formed by alkali treatment, the bundle of composite fibers was immersed in a heated caustic soda solution in a state where the cut both end surfaces were exposed, and the both ends were dissolved. Further, in Example 5 in which a tapered shape is formed by mechanical polishing, the composite fiber cut by the method described later is flocked to a toothbrush, and then the finishing process is performed by Z. It carried out using SWORD 116 (made by Zahoransky), and formed the bristle tip of the toothbrush in the taper taper shape. Moreover, in Example 6, after flocking the composite fiber cut by the below-mentioned method, the hair tip was cut so that a hair length might be set to 13 mm, and deburring was performed. The characteristics of the obtained brush bristle material are shown in Table 2.

  As Comparative Example 1, a PBT fiber was dipped in a caustic soda solution in the same manner as described above to prepare a bristle for brush in which both ends were processed into a tapered shape.

[Preparation of toothbrush]
The brush bristle material obtained by the above method was set in a flat-line type flocking machine, picking a predetermined number (about 15 to 40), and folding it in half into the flocked holes of the toothbrush head along with the flat line. . As a toothbrush head, the diameter of a flocking hole used 1.5 mm and had a flocking part of 8 rows 4 rows. Table 2 shows the bristle height (mm) and the number of implanted hairs (rows / hole) of the toothbrushes prepared in Examples and Comparative Examples.

The following evaluation was performed about each obtained toothbrush, and the result shown in Table 2 was obtained.
[Cleanability evaluation]
An artificial plaque made by Nissin was applied to a dentition model and allowed to dry for 5 minutes or more. From the upper surface of the dentition model, a toothbrush containing water was pressed with a force of 230 g, and brushing was performed in a direction along the dentition with a stroke width of 70 mm and a stroke speed of 180 mm / sec. For evaluation of the tooth surface, the upper side of the posterior tooth portion of the dentition model was used, and for the evaluation of the space between the teeth, the outer side of the anterior tooth portion was used. The cleaning property was calculated by the following equation from the number of times of brushing up to the standard, based on the degree of remaining of the stain when brushed 20 times with a nylon bristle toothbrush.
Cleanability = 20% (the number of times of brushing up to the standard)

[Feeling durability evaluation]
A load of 500 g is applied vertically from the back side of the sliding surface to the toothbrush, and hot water is dropped at 37 ° C against a stainless steel corrugated plate with a stroke width of 70 mm and a stroke speed of 180 mm / sec in the longitudinal direction of the toothbrush. The sliding movement 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 A mm, and the lateral width after sliding is B mm, the method of calculating the hair opening ratio is (B−A) / A × 100%.

[Feeling, evaluation of bubbling]
Twenty adults were asked to use a toothbrush for 30 days, and responses were obtained according to the following criteria, and the average score was taken as the evaluation value.
Score Feeling Foaming 5 Very Soft Very Foamy 4 Soft Foamy Good 3 Normal Not Like 2 Hard Foaming Bad 1 Very Hard Very Foaming Bad

  The present invention is applicable to any brush, and is particularly suitable for a toothbrush, a brush for precision cleaning and the like.

DESCRIPTION OF SYMBOLS 1 Brush hair material 2 Gear type resin phase 3 Other resin phase 4 gear type cross section composite fiber 5 taper taper part 11 brush material 12 toothbrush constituent member 12a head part surface side member 12b head part back side member 13 toothbrush 14 Flocked hole 15 Flat wire 16 Through hole 17 Burning ball 21, 31, 41, 51 Hair material for brush 22, 32, 42, 52 Gear type resin phase 23, 33, 43, 53 Other resin phase 24, 34, 44 , 54 gear type cross section composite fiber 35, 55 groove 61, 71, 81, 91, 101, 111 gear type cross section composite fiber 62, 72, 82, 92, 102, 112 for bristle material construction for brush resin phase of gear type 63, 73, 83, 93, 103, 113 Other resin phase 84 Bulged part 85 Further resin phase

Claims (10)

  A gear type cross section which is formed of at least two types of resin phases, and at least one type of resin phase is formed in a resin phase portion arranged in a gear type having 3 to 32 teeth with respect to the other resin phase in the fiber cross section A hair material for a brush characterized by comprising composite fibers.   The bristle for brushes according to claim 1, wherein the width of the tooth portion of the resin phase portion disposed in the gear type in the fiber cross section of the gear type cross-section composite fiber is in the range of 10 to 300 m.   The bristle for brushes according to claim 1 or 2, wherein the diameter of the gear-shaped cross-section composite fiber is in the range of 50 to 1,000 μm.   The bristle for brushes according to any one of claims 1 to 3, wherein at least one end of the bristle for bristles in the fiber longitudinal direction is formed in a tapered shape.   The bristle material for brushes according to any one of claims 1 to 4, wherein the at least two types of resin phases consist of resin phases having different coefficients of friction.   The bristle material for brushes according to any one of claims 1 to 5, wherein the at least two types of resin phases consist of resin phases having different color tones.   The bristle material for brushes according to any one of claims 1 to 6, wherein the at least two resin phases consist of resin phases having different drug dissolution rates.   The resin phase portion consisting of at least one resin phase of at least two resin phases different in drug dissolution rate from each other in the form of the gear type or the female type of the gear type at at least one end in the fiber longitudinal direction The bristle for brushes according to claim 7, which protrudes in a direction.   The bristle material for brushes according to claim 8, wherein between the adjacent resin phase portions in the resin phase portion protruding in the fiber longitudinal direction is formed in a groove having a depth of 0.1 mm or more recessed in the fiber longitudinal direction.   The brush in which the bristle material for brushes in any one of Claims 1-9 is used at least in part.

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