TW201731418A - Bristle material for brush, and brush using same - Google Patents

Abstract

A bristle material for a brush. The bristle material for a brush is characterized by being configured using a regional-division-type composite fiber that is formed from at least two types of resin phase. At a fiber horizontal cross-section, regions formed from the at least two types of resin phase are divided in circumferential angle directions into 2-32 regions. A brush that uses said bristle material for a brush. The present invention can provide a bristle material that is for a brush and that can achieve a good balance between excellent cleaning properties at gap regions of a thing to be cleaned and excellent massaging effects with respect to the thing to be cleaned, and that can also achieve a unique feel, etc. and has an excellent appearance. The present invention can also provide a brush that uses said bristle material for a brush.

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 such a brush using a brush for a brush, for example, a toothbrush, the cleaning effect of the tooth caused by the tip of the hair is balanced, and the massage effect of the tooth or the gum which is suitable for the object to be cleaned without damage to the object to be cleaned is well balanced. Excellent.

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. In other words, when the brush is made of a single material, the toughness of the brush is also increased, and the cleaning effect of the flat surface of the tooth or the massage effect of the gums is improved. On the other hand, the cleaning effect between the teeth is lowered, or the touch on the gums is too strong, and it is difficult to obtain a soft touch that is less likely to damage the gums.

In the case where the brush is made of a single material, the brush is made of a single material, and although the cleaning effect between the teeth is high, the toughness of the brush material is weakened throughout the entire length, and there is a gum. The massage effect is lowered, or the durability of the wool itself is lowered. In addition, when it is desired to improve the cleaning effect between the teeth, it is usually required to make the hair tip soft, but In that case, although it is good for people with weak gums such as periodontal disease, there will be more people who feel that the hairiness of the hair tips is insufficient.

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

Therefore, in order to balance the excellent cleaning effect with the characteristic that it is difficult to damage the object to be cleaned, there is a proposal for a brush material using a sea-island composite fiber as a brush material and a hair material for use in a brush. In the root portion, the sea-island component is a composite fiber structure, and a structure in which a plurality of island portions are exposed and distributed is formed in the distal end portion (Patent Document 1). By using the brush material, the excellent cleaning effect can be balanced with the characteristics of the so-called hard-to-clean material, and the soft and unique touch can be obtained by the exposed fine island fibers at the front end portion. . However, the brush bristle material proposed in the above-mentioned Patent Document 1 is difficult to coexist in a good balance between the excellent cleaning effect such as the interdental space and the excellent massage effect such as the gum which is maintained at a certain level or higher. .

However, in addition to the problem of the prior art brush material for a brush, a technique for manufacturing a sea-island composite fiber has recently been proposed, which can form various states in the distribution state of the island portion or the cross-sectional shape of the island portion (Patent Literature) 2~4). According to the proposed technique, the size, arrangement, cross-sectional shape, and arrangement density of the island portion of the sea portion can be substantially freely designed in the sea-island composite fiber, and can cope with various requirements in various fields. Put a big expectation.

In addition, a composite fiber in which a dissimilar resin phase is arranged in a radial shape in a cross section has been known (Patent Documents 5 to 8). Of course In addition, in the above-mentioned Patent Documents 5 to 8, the use of the brush material for the brush is not considered, and only the knowledge of the composite fiber described in the patent documents is known, and the conventional brush as described above cannot be reached. Elimination of the problem of using wool.

Prior technical literature Patent literature

Patent Document 1 Japanese Patent Laid-Open No. Hei 3-99604

Patent Document 2 Japanese Patent Laid-Open Publication No. 2011-174215

Patent Document 3 Japanese Patent Laid-Open Publication No. 2012-127022

Patent Document 4, JP-A-2013-14872

Patent Document 5 Japanese Patent Laid-Open No. Hei 8-158228

Patent Document 6 Japanese Patent Laid-Open No. Hei 8-325827

Patent Document 7 Japanese Patent Laid-Open Publication No. 2000-17554

Patent Document 8 Japanese Patent Laid-Open Publication No. 2003-293219

The subject of the present invention is to focus on the problems of conventional brush materials, and to provide a brush for use in the manufacture of island composite fibers in which the cross-sectional shape can be substantially freely designed. The brush is made of a brush material suitable for use as a brush material, and particularly excellent in the excellent cleaning property of the gap portion of the object to be cleaned, and the massage effect or the unique touch feeling excellent for the object to be cleaned. Coexisting brush with wool.

In order to solve the above problems, the brush bristle material of the present invention is characterized in that it is composed of a region-divided cross-section composite fiber in which at least two types of resin phases are formed, and In the cross section of the fiber, the region formed by at least two kinds of resin phases is divided into 2 to 32 regions in the circumferential direction.

In the brush material of the present invention, since the composite fiber constituting the hair material is formed of at least two kinds of resin phases, it is possible to exhibit at least two types of friction coefficients by using only the composite fiber without blending. The wool material can constitute a wool material having a unique touch or excellent abrasion feeling, and can be formed of a different resin phase to form a hair material excellent in appearance. Further, since the wool material is composed of the region-divided cross-section composite fiber, the region-divided cross-section composite fiber is divided into two in the fiber cross-section by a region formed by at least two kinds of resin phases in the circumferential direction. Since the area is 32, it is possible to use various resin-shaped portions that are arranged in a region-divided type in the tip of the wool material to form a suitable tip shape for the brush. For example, the outer peripheral surface of the burr can be formed in a form in which a resin phase portion having mutually different friction coefficients is alternately arranged in a region-divided type, or a resin phase portion in which one of the resin phase portions different from each other is left, in the apex portion By removing the resin phase portion other than the resin phase portion, the resin phase portion of the resin phase portion which is disposed in the circumferential direction is formed as a space capable of trapping dirt, and can form various hair tip shapes suitable for the brush. . As a result, it is also possible to constitute a brush material which can coexist with the excellent cleaning property of the gap portion of the object to be cleaned and the massage effect excellent for the object to be cleaned.

In the brush base material of the present invention, it is preferable that the diameter of the area-divided cross-section composite fiber is in the range of 50 to 1,000 μm, more preferably 80 to 500 μm. When the diameter of the conjugate fiber is less than 50 μm, the toughness 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 toughness of the conjugate fiber portion itself used in the brush becomes too strong, and depending on the form of the tip end portion where the apex is formed, the apex portion is strongly pressed until it is cleaned. On the side of the object, it is easy to damage the sputum of the object to be cleaned.

Further, in the brush material of the present invention, as described later, the tip portion of each of the specific forms is formed at one end portion or both end portions of the fiber material in the longitudinal direction of the fiber, but the length of the fiber tip portion in the fiber length direction is Preferably, it is in the range of 0.5 to 10 mm, more preferably in the range of 1 to 5 mm. When the length of the hair tip portion is shorter than 0.5 mm, it is difficult to obtain excellent cleaning properties for a thin portion such as a tooth portion due to the tip portion, and it is also difficult to obtain a good soft touch. When the length of the tip portion is longer than 10 mm, the tip of the hair tends to become too long, and the tip portion is excessively deformed and the tip portion is cleaned (for example, the effect of collecting dirt). Or the massage effect of the gums is insufficient.

Further, in the brush bristle material of the present invention, at least one end portion of the brush bristle material in the longitudinal direction of the fiber may be formed into a tapered shape of a head shape, or an outer diameter of the cross section may be formed to the hair material. The front end is substantially maintained in the same diameter shape. When it is formed into a tapered shape with a small head shape, it is easy to obtain excellent cleaning property for a thinner portion, and if it is formed to have a shape substantially the same diameter until the tip end, it is easier to form a scraping or catching dirt. Space or ditch.

Further, in the brush base material of the present invention, the resin phase having various characteristics may be used for the at least two types of resin phases. For example, at least two types of resin phases may be used in a resin phase form having mutually different friction coefficients, and at least two types of resin phases may be in a resin phase form having mutually different color tones, and the at least two types of resin phases may contain mutually different drug dissolution rates. The resin phase morphology and the like.

In the case of the resin phase of at least two types of mutually different drug dissolution rates, the resin region including at least one of the resin phases may be in the form of the above-described divided region in at least one end portion in the longitudinal direction of the fiber. The shape in which the length direction is prominent. Examples of various forms will be described later. Moreover, in this case, it is preferable that the length of the resin region protruding in the longitudinal direction of the fiber in the longitudinal direction of the fiber is in the range of 0.5 to 10 mm, more preferably in the range of 1 to 5 mm. When such a protruding resin region is formed, the dirt scraping performance of the hair tip portion or the catching property of the scraped dirt can be improved.

In the form of the resin phase in which the resin phase contains at least two types of resin phases having different drug dissolution rates, the type of the resin is not particularly limited, and for example, it is classified into two types including different dissolution rates of the drug. In the case of the conjugate fiber of the resin phase, one resin phase may include a polyester resin, and the other resin phase may include a form of a resin having a slower dissolution rate than the polyester resin. More specifically, it may be exemplified that the above one resin phase contains polybutylene terephthalate (PBT), and the other resin phase contains a form of nylon (registered trademark) (Ny), or the above one resin phase contains polyparaphenylene Ethylene dicarboxylate (PET), and the other resin phase contains the shape of polybutylene terephthalate (PBT) state. Further, in the case of performing the drug dissolution treatment, the processing of the twisted wool material may be performed before or after the treatment.

Further, in the brush bristle material of the present invention, the cross-sectional outer shape of the area-divided cross-section conjugate fiber is preferably formed into a circular shape as exemplified as described later, but may be set to a circular shape. Any shape other than. The cross-sectional outer shape can be arbitrarily set according to the use or purpose of use.

The present invention also provides a brush for using at least a portion of the brush bristle of the present invention as described above. In particular, the brush of the present invention is suitable for use as a material which can balance the excellent cleaning property of the gap portion of the object to be cleaned and the massage effect excellent for the object to be cleaned, and further obtain a unique touch and the like. A brush, in particular a rotary electric toothbrush, or a brush for precision cleaning brushes. In particular, when applied to a rotary electric toothbrush, a remarkable excellent cleaning effect can be exhibited.

In the brush of the present invention, the range of the hair length (the length from the root of the brush to the tip of the brush) is preferably in the range of 1 to 50 mm, more preferably in the range of the preferred brush. 5~35mm range.

According to the present invention, it is possible to provide a brush material which can balance the excellent cleaning property of the gap portion of the object to be cleaned and the massage effect excellent for the object to be cleaned, and further obtain a unique touch. Sense, etc., the appearance is also excellent.

Further, according to the present invention, it is possible to provide a brush which uses at least a part of the brush material as described above, and in particular, a brush suitable for use as a toothbrush, in particular, a rotary electric toothbrush or a precision cleaning brush.

1‧‧‧ Brush with wool

2, 3‧‧‧ resin phase

4‧‧‧Divisional section profile composite fiber

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

21, 31, 41‧‧‧ brushed wool

22, 23, 32, 33, 42, 43‧‧‧ resin phase

24, 34, 44‧‧‧ area split profile composite fiber

25‧‧‧The thin tapered part

35, 45‧‧‧

51, 61, 71, 81, 91‧ ‧ ‧ area-divided cross-section composite fiber for brush material

52, 53, 62, 63, 72, 73, 82, 83, 92, 93‧‧‧ resin phase

Fig. 1 is a schematic side view showing one end portion of the wool material of Fig. 1(A), and Fig. 1(B) is a schematic view showing one end portion of the wool material of Fig. 1(A). Oblique view.

Fig. 2 is a schematic block diagram showing a method of planting a brush when a brush material is used for a toothbrush.

Fig. 3 is a schematic side view (Fig. 3 (A), (B1), (C)) and a schematic oblique view (Fig. 3 (B2) showing one end portion of a hair material according to another various examples of the brush material of the present invention. )).

Fig. 4 is a schematic cross-sectional view showing a variety of various examples of the brush material for a brush of the present invention.

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

Fig. 1 shows a brush material 1 according to an embodiment of the present invention, and Fig. 1(A) shows one end of the material 1. As shown in Fig. 1(B), the brush-based material 1 is composed of a region-divided cross-section conjugate fiber 4, and the region-divided cross-section conjugate fiber 4 is composed of at least two types of resin phases 2 and 3 (in the present embodiment). , which are formed by two kinds of resin phases having different color tone or/and friction coefficient, and two kinds of resin phases in the fiber cross section. The area formed by 2 and 3 is divided into four areas in the circumferential direction (in the example of the figure, the resin phases 2 and 3 are alternately arranged at a circumferential angle of 90 degrees). For example, both the resin phases 2 and 3 are formed of polybutylene terephthalate (PBT), and the color tone or/and the coefficient of friction are different from each other. In the area-divided cross-section conjugate fiber 4 of the present embodiment, the resin phases 2 and 3 are equally divided at a circumferential angle of 90 degrees, but are not limited to equal division. In particular, the region-divided cross-section composite fiber 4 of the above-described type can be designed substantially freely by the size, arrangement, cross-sectional shape, arrangement density, and the like of the island portion of the sea portion, as described in the above Patent Documents 2 to 4. The technology is planned and produced.

In the present embodiment, the segment-divided cross-section composite fiber 4 constituting the brush material 1 is formed to extend substantially the same diameter to the tip end of the brush material, but as shown in FIG. 3(A) to be described later. Further, it is also possible to form a shape in which at least one end portion of the longitudinal direction of the fiber is formed into a tapered shape of a head. The formation of such a thin tapered portion can be carried out, for example, by sequentially dissolving a specified length portion of one end portion of the felt material 1 by alkali treatment or by mechanical polishing. In the present embodiment, the brush body 1 having a substantially thin tapered portion and having a substantially the same diameter as the tip end is included, and the tip end portion of the brush is included, and the outer surface of the felt 1 is different. The resin phases 2 and 3 alternately appear, and the mutually different characteristics (for example, hue or/and friction coefficient) of the respective resin phases 2 and 3 are alternately exhibited in the outer peripheral direction, and the design is excellent in appearance, or/and Show a unique touch.

The brush bristle material 1 configured as described above is used for at least a part of the production of various brushes. In general, as a brush A method in which a hair material is planted on a brush to constitute a member, and two representative methods are used as a case of using a toothbrush as an example, and will be described with reference to FIG. 2 .

Fig. 2(A) shows a 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 cross-sectional view are enlarged. 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 previously prepared brush material 11 are the tips of the brush. 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, so that the toothbrush product is completed. The finished toothbrush system is commonly referred to as a flat wire toothbrush. In such a flat-line toothbrush, one end portion of the brush material 11 which is prepared in advance is a tip of the brush. Therefore, when the brush material 1 for a brush of the present invention is used for a flat toothbrush, the special shape of the tip portion of the tapered portion or the like is formed at both end portions of the brush material 1 and used when In the case of a flat toothbrush, the special shape of the tip portion is formed at one end of the brush material 1 .

In the brush using the brush bristle material 1 of the above embodiment, the conjugate fiber 4 constituting the bristle material 1 is as described above. Since the two types of resin phases 2 and 3 are formed, it is possible to form the hair material 1 capable of exhibiting two types of color tone and/or friction coefficient by using only the conjugate fiber 4 without blending, and it is possible to form a unique touch or excellent abrasion feeling. At the same time, the wool material 1 is formed of a different resin phase 2 and 3 by the outer peripheral surface, and includes a hair tip portion and a band-like pattern on the outer peripheral surface, so that the wool material 1 excellent in design and design can be formed. Further, in the wool material 1, the region-divided cross-section composite fiber 4 is used, and the region-divided cross-section composite fiber is formed by two kinds of resin phases 2 and 3, and two types in the fiber cross section. Since the regions formed by the resin phases 2 and 3 are divided into four regions in the circumferential direction, it is possible to form various types of tip shapes suitable for use as brushes by using the resin phase 2 and the three portions arranged in the region. The form, which is a form in which the color tone or the friction coefficient is alternately changed in the circumferential direction, can obtain excellent design properties or a unique excellent touch.

In the brush bristle material of the present invention, various types of cross-sectional composite fibers which are divided into 2 to 32 regions in the circumferential direction by using a region formed of at least two kinds of resin phases can be used. form. Various forms are illustrated in FIG.

The brush bristle material 21 shown in Fig. 3(A) is composed of a region-divided cross-section composite fiber 24, and the region-divided cross-section conjugate fiber 24 has two resin phases 22 which are equivalent to those shown in Fig. 1 23 (in the present embodiment, two kinds of resin phases having different color tones or/and friction coefficients), and a region formed by two kinds of resin phases 22 and 23 in the cross section of the fiber at a circumferential angle The direction is divided into four regions, and at least one end portion of the brush material 21 in the longitudinal direction of the fiber is formed into a tapered shape 25 of a head shape. The formation of the thin tapered portion 25 of this head, for example The designated long portion of one end portion of the felt member 21 can be sequentially dissolved by alkali treatment or formed by mechanical grinding. When the tapered portion 25 is formed by dissolution or mechanical polishing by alkali treatment, for example, each of the resin phases 22, 23 may be a polyester resin of the same kind having a color tone or/and a coefficient of friction different from each other. For example, polybutylene terephthalate (PBT) having a different hue or/and a coefficient of friction may be formed.

The brush material 31 shown in Figs. 3 (B1) and (B2) is composed of a region-divided cross-section composite fiber 34 including two types of resin phases 32 and 33, and is a resin phase which is dissolved by a chemical such as an alkali. 32 (for example, a resin phase containing polybutylene terephthalate (PBT)) and a resin phase 33 (for example, a resin phase containing nylon (registered trademark) Ny) which is not dissolved by an alkali. In the tip end portion of the wool material 31, by applying alkali treatment to a predetermined long portion in the longitudinal direction of the fiber, only the resin phase 32 is dissolved, and the resin phase 33 is not dissolved and left, whereby the dissolved portion can be formed. The resin phase 32 is partially formed as a space portion, and the resin phase 33 portion is formed in a fiber longitudinal direction in a region in which at least one end portion of the fiber longitudinal direction is divided, and is formed as a tip portion of the protruding portion 35. The hair tip portion in such a form is particularly effective in the use of a rotary electric toothbrush in that it has a remarkable cleaning effect (a scraping effect of dirt and a catching effect of dirt). The brush bristle material 41 shown in Fig. 3(C) is composed of a region-divided cross-section composite fiber 44, and the region-divided cross-section composite fiber 44 is equivalent to those shown in Figs. 3(B1) and (B2). The area division form includes two kinds of resin phases 42 and 43 which are different in dissolution rate of the mutually different chemicals. For example, the resin phase 42 having a faster alkali dissolution rate contains polyethylene terephthalate (PET), and the alkali dissolution rate is higher. The slow resin phase 43 includes, for example, a poly pair Butylene phthalate (PBT). In the front end portion of the wool material 41, the alkali phase is gradually applied to the designated long portion in the longitudinal direction of the fiber, and the portion of the resin phase 42 in which the dissolution rate of the specified long portion is faster is completely dissolved, and the dissolved resin phase 42 is dissolved. Part of the projection is formed as a space portion, and the resin phase 43 having a slow dissolution rate is partially dissolved in the end portion side, and the portion of the projection portion 45 is left as a whole, and the portion of the projection portion 45 is attached to the fiber. The tapered shape of the head protruding in the longitudinal direction can form the tip portion of the figure by forming the above shape. Compared with the hair tip portion of the form shown in Figs. 3 (B1) and (B2), the hair tip portion of such a shape can further improve the cleaning performance for the thin gap portion.

Further, in the present invention, various forms may be employed in the cross-sectional form of the area-divided cross-section composite fiber used in the constitution of the brush material. Various forms are illustrated in FIG.

In the region-divided cross-section composite fiber 51 for constituting the brush material shown in Fig. 4(A), the number of divisions of the divided regions formed by the two types of resin phases 52 and 53 is 6, and each divided region is circumferential. The angle is 60 degrees and so on. In the region-divided cross-section composite fiber 61 for constituting the brush material shown in Fig. 4(B), the number of divisions of the divided regions formed by the two kinds of resin phases 62 and 63 is 8, and each divided region is circumferential. The angle is 45 degrees and so on. In the region-divided cross-section conjugate fiber 71 for constituting the brush material shown in Fig. 4(C), the divided regions formed by the two kinds of resin phases 72 and 73 are divided into a plurality of division numbers in the circumferential direction and the like. distribution. With regard to such a number of divisions, it is possible to carry out an optimum design in the range of 2 to 32 in accordance with the purpose of use or use.

Further, in the region-divided cross-section composite fiber 81 for constituting the brush material shown in Fig. 4(D), the number of divisions of the divided regions formed by the two kinds of resin phases 82 and 83 is 8, and the resin phase 82 is The circumferential angles of the divided regions and the divided regions of the resin phase 83 are set at mutually different angles. In the region-divided cross-section composite fiber 91 for the brush bristle material shown in Fig. 4(E), the number of divisions of the divided regions formed by the two kinds of resin phases 92 and 93 is 2, and the divided region of the resin phase 92 The circumferential angles of the divided regions with the resin phase 93 are set at mutually different angles. As described above, the circumferential angle of the divided regions of the respective resin phases can be set substantially arbitrarily. As described above, various cross-sectional configurations can be employed, and various combinations of the modes other than the examples of the drawings or the examples of the drawings can be employed. These forms can be optimally designed according to the purpose of use or purpose of use.

Regarding several examples of the various examples described above, Table 1 summarizes typical features of the brush material of the present invention applied to a toothbrush. In the first embodiment, which is the same as the embodiment shown in Fig. 1, a hair tip having two types of color tone or/and a coefficient of friction is obtained, and an excellent appearance (design property) of a feeling of abrasion, a unique touch, and a band shape is obtained. In the second embodiment, which is the same as the embodiment shown in Fig. 3(A), in addition to the performance of the first embodiment, the cleaning property for the thin portions such as the teeth can be further improved. Further, an appropriate massage effect is obtained, and the cleaning property against the fine portion and the massage effect can be balanced in good balance. In the third embodiment, which is the same as the embodiment shown in Figs. 3(B1) and (B2), an excellent massage effect is obtained, and the cleaning property can be further improved on the tooth surface or the like to obtain an edge effect. (scraping, capturing of dirt) Excellent hair tip. In particular, in the third embodiment, particularly when used in a rotary electric toothbrush, a remarkable cleaning effect (a scraping effect of dirt and a catching effect of dirt) can be exhibited. Further, in the type of the space portion in which the groove is formed between the protruding portions in the third embodiment, for example, when cooling is performed to prevent the friction material from being heated, a high cooling effect is obtained. Further, ○ in Table 1 indicates that the characteristics are equal to or higher than those of the comparative object, and ◎ indicates that it is remarkably superior to the comparative object.

[Examples]

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

Examples 1 to 5 and Comparative Example 1 [Production of brush with wool]

Polybutylene terephthalate (PBT, Toraycon (registered trademark) 1100SW made by Toray Co., Ltd.), polyethylene terephthalate (PET, Toray (T755M), nylon) 610 (Ny610, "Amilan" (registered trademark) CM2001 manufactured by Toray Industries, Inc.) was dried under the recommended conditions and prepared as a raw material. The composition, the color tone, and the number of division of each resin layer were as shown in Table 2, and the area-divided cross-section composite fiber was melt-spun. Here, when the resin layer differs in the dissolution rate, the resin layer having a high dissolution rate is in the order of the a layer and the b layer. Further, each divided area is designed to be equally distributed.

After the dissolved fiber is cooled and solidified in water, it is extended as a second stage in warm water of 60 ° C as a second stage in a dry environment of 120 ° C to 4.5 times, followed by relaxation heat setting in a dry heat environment. And a composite fiber is obtained. This fiber was bundled into a linear shape having a beam diameter of 45 mm and packaged, and then cut into an arbitrary length.

Then, a tip portion is formed at the front end. In Examples 1 to 3 in which the hair tips were formed by alkali treatment, the bundle of the composite fibers was immersed in the heated caustic soda solution to dissolve both end portions. In addition, in the fourth embodiment in which the tapered shape of the head is formed by mechanical polishing, the cut composite fiber is planted on the toothbrush by a method described later, and final processing is performed using Z.SWORD 116 (manufactured by ZAHORANSKY Co., Ltd.). The tip of the toothbrush is formed into a thin tapered shape shape. Further, in Example 5, after the cut composite fiber was planted by the method described later, the hair tip was cut so that the hair length became 13 mm, and the burr was removed. Table 2 shows the characteristics of the obtained brush material.

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

[Toothbrush making]

The brush material obtained by the above method is installed in a flat wire type hair-planting machine, and the specified number of roots (about 15 to 40 pieces) is sorted and folded into the planting pores 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 dried 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 at a stroke width of 70 mm and a stroke speed of 180 mm/sec in the direction of the dentition. The evaluation of the tooth surface used the upper side of the molar portion of the dentition model, and the evaluation between the teeth used the outer side of the front tooth portion. The residual state of the dirt when the nylon hairbrush was washed 20 times was used as a standard, and the cleaning performance was calculated from the number of times of washing up to the standard.

Sweepability = 20 ÷ (number of washes reaching the baseline)

[Evaluation of durability against hair growth]

For the toothbrush, a load of 500 g was applied perpendicularly from the back side of the sliding surface to drip the warm water of 37 ° C, and the stroke width was 70 mm and the stroke speed was 180 mm/sec in the longitudinal direction of the toothbrush with respect to the corrugated plate made of stainless steel. This was subjected to a sliding motion 1000 times, and the hair opening rate (%) of the brush portion was measured. When the lateral width of the brush portion in the initial state is regarded as Amm and the lateral width after sliding is regarded as Bmm, the calculation method of the bristles is (B-A)/A×100%.

[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.

Industrial utilization possibility

The present invention is a brush that can be applied to everything, and is particularly suitable for various toothbrushes including a rotary electric toothbrush, a brush for precision cleaning, and the like.

1‧‧‧ Brush with wool

2, 3‧‧‧ resin phase

4‧‧‧Divisional section profile composite fiber

Claims (9)

A brush material comprising a region-divided cross-section composite fiber, wherein the segment-type cross-section composite fiber is formed of at least two types of resin phases, and at least two types of resins are used in the fiber cross-section. The area formed by the phase is divided into 2 to 32 regions in the circumferential direction. The brush for a brush according to claim 1, wherein the diameter of the cross-sectional composite fiber of the region is in the range of 50 to 1,000 μm. The brush material according to claim 1, wherein at least one end of the fiber length direction of the brush body is formed into a tapered shape of the head. A brush material according to claim 1, wherein the at least two types of resin phases comprise resin phases having mutually different friction coefficients. The brush bristle according to claim 1, wherein the at least two kinds of resin phases comprise resin phases different in color tone from each other. A brush material according to claim 1, wherein the at least two types of resin phases comprise a resin phase in which the dissolution rates of the agents are different from each other. The brush material according to claim 6, wherein the resin region including at least one resin phase of the resin phase having at least two kinds of different drug dissolution rates is at least one end portion in the longitudinal direction of the fiber. The form is protruding in the longitudinal direction of the fiber. The brush bristle according to claim 7, wherein the length of the resin region protruding in the longitudinal direction of the fiber is in the range of 0.5 to 10 mm. A brush for use in at least a portion of the brush bristle according to any one of claims 1 to 8.