JP2010082094A - Toothbrush filament and toothbrush provided with the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a toothbrush filament and a toothbrush provided with the same, which is excellent in cleaning the detail, whose brush is strong and powerful for brushing, which can enhance durability by preventing the edge from splitting off and prevent dirt from attaching. <P>SOLUTION: The toothbrush has a core capsule structure composed of a core 2 and a capsule 3 to enclose the core 2; each of the core 2 and the capsule 3 is made from a medicinal solvent synthetic resin; the synthetic resin of the core 2 is a resin whose medicinal dissolution speed is slower than the synthetic resin of the capsule 3; a filament edge 10 being the edge side is formed of multiple sharp-pointed taper branches 4 composed of the core 2 exposed from the capsule 3 by a medicinal dissolution process. The cross-sectional shape of the core 2 is multilobate or multilobed; the edge side exposed from the capsule 3 by the medicinal dissolution process is branched per lobe to form the branches 4. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a filament for a toothbrush, and more particularly relates to a filament for a toothbrush that is excellent in fine-cleaning property, hardly adheres to dirt, etc., and is excellent in durability, and a toothbrush in which the filament is implanted.

  As a method for improving the penetration between the teeth of the filament to be implanted in the brush portion of the toothbrush, a method in which a sharp taper is provided on the tip side by a chemical solution dissolution process has been proposed (for example, see Patent Document 1). However, there has been a problem that the taper of the taper becomes weak, and the brushing effect on the tooth surface is lowered, the feeling of brushing is poor, and the durability is lowered. In order to solve this problem, 2-5 cores made of polyamide resin are scattered in the sheath made of polyester resin, and the sheath is dissolved in an alkaline solution so that only the core is exposed on the filament tip side. Have been proposed (see Patent Document 2).

  In the case where such a plurality of branch portions are provided at the filament tip portion, it is possible to improve the penetration between the teeth while maintaining a certain bristle strength, and to improve the cleaning property and durability. . However, since the thing of patent document 2 forms a branch part by leaving a core part without melt | dissolving, each branch part which consists of a core part made from a polyamide resin is not a taper-shaped sharp shape, and detailed cleaning property There were certain limits.

  On the other hand, the filament itself is made of a chemical-soluble polyester resin, and the cross-sectional shape is set to an irregular cross-sectional shape such as a multi-leaf shape, so that the filament tip is branched for each leaf portion by the chemical solution dissolution treatment. A toothbrush filament having a structure in which a plurality of tapered branch portions are formed has been proposed (see, for example, Patent Documents 3 to 7). However, the filament having a different cross-sectional shape separated by such a melting treatment has a narrow joint portion between the leaf portions, and a force acts on the branch portion during use, so that the proximal end side of the branch portion is used. As a result of tearing from the joining portion and branching, there is a problem of durability such that it cannot be used. Further, in the case of such an irregular cross-sectional shape filament, a side surface of the filament has a concave groove (concave portion) along the longitudinal direction at the joint portion between the leaf portions, and the filament base end where dirt is particularly liable to accumulate. There is also a hygiene problem that dirt is unavoidably accumulated in the concave groove on the side. Furthermore, since it has an atypical cross-sectional shape, there is also a problem in that the fluff becomes weak depending on the direction.

JP-A-6-141923 Japanese Patent Laid-Open No. 9-322821 JP 2001-169827 A JP 2002-58538 A JP 2003-144229 A JP 2003-199626 A JP 2003-339445 A

  Therefore, in view of the above-mentioned situation, the present invention is to solve the problem that it is excellent in detail cleaning property, and at the same time has strong bristle and wiping force, and also prevents tearing of the tip part to enhance durability, The object of the present invention is to provide a filament for a toothbrush that can prevent the adhesion of dirt and a toothbrush in which the filament is implanted.

  In order to solve the above-mentioned problems, the present invention has a core-sheath structure comprising a single or a plurality of core parts and a sheath part surrounding the core part, and both the core part and the sheath part are made of a chemical-soluble synthetic resin. The synthetic resin of the core portion is a resin having a slower chemical solution dissolution rate than the synthetic resin of the sheath portion, and at least one end portion includes a plurality of core portions exposed from the sheath portion by the chemical solution dissolution treatment. A toothbrush filament characterized by forming a sharply tapered branched portion was constructed.

  Here, it is preferable that the cross-sectional shape of the core portion is a multi-leaf shape or a multi-leaf shape, and the branch portion is formed by branching the end portion for each leaf portion by a chemical solution dissolution treatment.

  In particular, it is preferable that the cross-sectional shape of the core portion is a multi-leaf shape composed of two or more substantially identical leaf portions.

  More specifically, a preferred embodiment is such that the cross-sectional shape of the core portion is a multi-leaf shape in which a plurality of side leaf portions are connected around a specific leaf portion.

  Moreover, it is preferable that the synthetic resin of the said core part and the synthetic resin of the said sheath part are the same kind of resin mutually.

  In particular, the same type of resin is preferably a polyester resin.

  Moreover, this invention also provides the toothbrush characterized by having implanted the said toothbrush filament.

  According to the filament for a toothbrush according to the present invention and the toothbrush provided with the filament according to the present invention as described above, since at least one end portion of the filament has a plurality of sharp tapered branch portions, the fine cleaning property. In addition, the core part that forms the branch part is protected from the outside by a sheath part made of synthetic resin with a high chemical solution dissolution rate, so that the tip part is prevented from tearing and durability is improved. Will be. In addition, the side surface of the sheath part, which is the side surface of the filament, does not require a concave portion, prevents adhesion of dirt, and is a non-branched part protected by the sheath part other than the tip part. Is strong and demonstrates excellent brushing power.

  Further, since the cross-sectional shape of the core part is a multi-leaf shape or a multi-leaf shape, and the end portion is branched for each leaf part by a chemical solution dissolution treatment, the branch part is formed. It will be provided so that the sheath part fits into the concave part between the leaf parts of the part, the joint strength between the core part and the sheath part is improved, and it is excellent in durability that the split part and the sheath part are less likely to peel off Becomes a filament.

  In addition, since the synthetic resin in the core and the synthetic resin in the sheath are the same type of resin, the compatibility improves the bonding strength of each other, and the durability is also less likely to cause splitting of the branch and peeling of the sheath Excellent filament.

  Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is an explanatory view showing the overall configuration of a toothbrush 5 in which a filament 1 according to the present invention is implanted. FIGS. 3 to 5 are a first embodiment of the filament of the present invention, and FIGS. 6 and 7 are a second embodiment. 8 to 11 show a third embodiment, in which 1 denotes a filament, 2 denotes a core portion, 3 denotes a sheath portion, and 4 denotes a branching portion.

  As shown in FIGS. 3 and 4, the toothbrush filament 1 of the present invention has a core-sheath structure including a core portion 2 and a sheath portion 3 surrounding the core portion 2, and both the core portion 2 and the sheath portion 3 are dissolved in a chemical solution. The synthetic resin of the core portion 2 is a resin whose chemical solution dissolution rate is slower than that of the synthetic resin of the sheath portion 3, and is exposed from the sheath portion 3 to the filament tip portion 10 on the tip side by the chemical solution dissolution treatment. A plurality of sharply tapered branch portions 4 formed of the core portion 2 are formed. The presence of the branch portions 4 is excellent in detail cleanability, and at the same time, the outer layer is protected by the sheath portion 3 so that dirt, etc. Is a filament that is difficult to adhere, can prevent the branch portion 4 from tearing, and has excellent durability.

  1 and 2 show a toothbrush 5 in which a filament 1 according to the present invention is implanted, and filaments 1,... As shown in FIG. 3, the filament 1 is cut into a dimension L slightly longer than about twice the hair height H in the flocked state, and then formed with a plurality of sharp tapered branch portions 4 at both ends thereof. The length L of the filament 1 is preferably about 25 mm to about 35 mm, but is not limited to this range. Thus, the filament 1 which formed the branch part 4 in the both ends is made into a bundle | bundle one by one, and it bends in the approximate center, The toothbrush 5 shown in FIG. In addition, in this embodiment, although the branch part 4 is formed in the both ends of a filament, you may plant a hair so that a branch part may be provided only at one end and the other end side may be embedded in the planted part. Alternatively, a branch portion may be provided only at one end, and the other end side may be directly or may be planted by bending a taper shape by mechanical polishing at approximately the center. Further, in the present embodiment, the filament is implanted after forming the branching portion 4, but it may be formed by dipping in a solution after planting to form the sharp tapered branching portion 4.

  In addition, about the method of flocking a filament, the conventional method can be used widely, for example, bundles 10-40 filaments, presses a flat line to the center position, and drives the flock hole while deforming the filament bundle into a U shape. A method, a method of melting the filament proximal end side and embedding it in a flocked hole without using such a flat wire can be used. Moreover, the handle 50 of the toothbrush 5 shows an example, and is not limited to this, and may have various shapes. Moreover, various arrangement | positioning forms are employable also about arrangement | positioning of the flock hole of the filament 1 of the flocking part 51. FIG. Moreover, all the filaments are good also as the filament 1 which concerns on this invention in the flocking part 51, and you may mix the thing from which a form differs among them. Further, only a part of the filament 1 according to the present invention may be adopted, and the other may be a conventional filament, which can be properly used according to the purpose.

  First, based on FIGS. 3-5, 1st Embodiment of the filament 1 for toothbrushes of this invention is described.

The filament 1 of this embodiment is a multi-leaf shape in which the cross-sectional shape of the core portion 2 includes a plurality of leaf portions 20 as shown in the VV cross-sectional view of FIG. 3 has a substantially circular cross-sectional shape as a whole. More specifically, the cross-sectional shape of the core portion 2 is a multi-leaf shape composed of two or more substantially identical leaf portions 20, and in this example, the three leaf portions 20 having the same size (cross-sectional area) are assembled and integrated. is there. As shown in FIGS. 4 (a) and 4 (b), the core portion 2 having a multi-leaf shaped cross section composed of a plurality of leaf portions 20 having the same shape and size has a tip end side exposed from the sheath portion 3 by a chemical solution dissolving process. Branching is performed for each leaf portion 20, whereby a plurality of branch portions 4 having substantially the same length are formed at the filament tip portion 10.

  That is, the branch 4 on the filament tip side is prepared by first cutting a large number of filaments having the core-sheath structure shown in FIG. 4 (f) into a predetermined length, winding a chemical-resistant film and bundling them, and dissolving them. Immerse in liquid (chemical). The core part 2 and the sheath part 3 are both made of a chemical-soluble synthetic resin, and the sheath part 3 has a faster dissolution rate with respect to the same chemical solution than the core part 2, so that the core part is absorbed by the solution entering from the end of the film. 2 and the sheath 3 are melted at the same time, but the core 2 is gradually exposed, and the exposed core 2 is branched into a plurality for each leaf 20 to form a branched portion 4 (branched hair). The branch portion 4 is formed in a sharp taper shape, and the end portion of the sheath portion 3 where the core portion 2 is exposed is also formed in a taper shape.

  If the synthetic resin of the core part 2 and the synthetic resin of the sheath part 3 are the same type of resin, they are excellent in mutual adhesion due to compatibility, and peel off from the distal end side of the sheath part 3 or use of the branch part 4 Can prevent tearing. For example, when an alkaline solution is used, the core part 2 and the sheath part 3 include polybutylene terephthalate (PBT), polyethylene terephthalate (PET), polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polyester. Elastomers or mixed resins thereof can be used in appropriate combination depending on the chemical solution solubility. As the alkaline solution, in the case of a polyester resin, a caustic soda aqueous solution is preferably used. Moreover, the core part 2 and the sheath part 3 can be a combination of polyamide resins, and the branched part can be produced using an acidic solution. Of course, combinations of other chemical-soluble resins can be used.

  The configuration of the core portion 2 that forms the plurality of branch portions 4 having substantially the same length is not limited to that of the three leaf portions 20 as in this example, and for example, FIGS. 5 (a) and 5 (b). As shown in FIG. 5, even if there are four or more leaf portions 20 or two, it can be branched in the same manner. As shown in FIG. A preferred embodiment is one in which a plurality of bifurcated portions (two bifurcated portions are formed in each core portion 2 in the illustrated case, totaling four bifurcated portions) are formed at the filament tip portion. is there. Further, as shown in FIG. 5 (d), a core portion 2A having a single leaf cross section and a core portion 2B having a multi-leaf cross section having leaf portions 20 and 20 having substantially the same shape as this are combined. And a plurality of branch portions formed by combining the branch portions formed by the core portion 2B (in the illustrated case, two branch portions are formed by the core portion 2B, resulting in a total of three branch portions) are formed at the filament tip portion. Is also a preferred embodiment. In this example, the multi-leaf cross-sectional shape of each of the plurality of leaf portions 20 is substantially circular and is connected so that the circles partially overlap each other, but the circles are connected via an intermediate connection portion. You may comprise as follows. Further, the shape of the leaf portion 20 is not limited to a substantially circular shape, and may be an elliptical shape, a triangular shape, a quadrangular shape, a rhombus, a polygonal shape, or other irregular shapes.

  The sheath part 3 has a concentric outer shape having a common central axis with the core part 2 and has a shape in which the periphery of the core part 2 is wrapped without a gap, and due to the presence of the sheath part 3, the cross-sectional shape of the filament is approximately It has a circular cross-sectional shape. When the core part 2 has a multi-leafed cross-sectional shape and the sheath part 3 is not provided, a recess 23 appears between the leaf parts 20 and 20 on the outer peripheral surface of the core part 2, but when the recess 23 is exposed on the side surface of the filament. When the toothbrush is used after flocking, dirt is likely to accumulate in the concave portion 23 on the side surface on the base end side where dirt tends to accumulate, which is not preferable for hygiene purposes. In the present invention, since the concave portion 23 of the core portion 2 is hidden except for the filament tip portion 10 due to the presence of the sheath portion 3, there is no fear of adhesion of dirt, which is preferable in terms of hygiene.

  In this example, the outer shape of the sheath portion 3 is circular. However, the shape is not limited to this, and various shapes can be adopted as long as there is no concave portion such as a polygonal shape to which dirt may adhere. . The thickness of the portion surrounding the concave portion 23 between the leaf portions 20 and 20 of the core portion 2 of the sheath portion 3 becomes thick, and therefore the tapered portion at the tip of the sheath portion 3 becomes long and thin. Since it becomes easy, the shape where the thickness of this part does not become thick too much is preferable. 10A shows a triangular shape, FIG. 10B shows a rectangular shape, FIG. 10C shows a hexagonal shape, and FIG. 10D shows the triangular shape of the leaf portion of the core 2. Each of them has an R shape parallel thereto, but as shown in the figure, the corners of the polygon are this part so that the thickness of the part surrounding the recess 23 is not too thick. It is preferable to form so that it may not be located in.

  As shown in FIG. 4A, the height of the branch portion 4 of the filament tip 10 is substantially the same length, and is preferably about 1 to 5 mm. Not all of the core portion 2 exposed from the sheath portion 3 is branched, but the unbranched portion 24 that is not branched remains at the boundary portion with the sheath portion 3 on the exposed proximal end side. Although it is preferable in terms of prevention of tearing, the present invention is not limited to this and may of course be branched from the boundary portion. The dissolution rate of each part depends on the selection of the synthetic resin for the core 2 and the sheath 3, the selection of the solution, the immersion time, the concentration of the solution, the temperature, the diameter of the filament cross section, the bristle length of the toothbrush (planting length), etc. It is possible to set appropriately by adjusting.

  Next, a second embodiment of the present invention will be described with reference to FIGS.

As shown in the IX-IX cross-sectional view of FIG. 6 (e), the filament 1 of the present embodiment has a core in which a plurality of core portions 2 having a single-leaf cross section whose tip does not branch in the sheath portion 3 are spaced apart from each other. It has a sheath structure, and in this example, three circular cross-section core portions 2 having the same size (cross-sectional area) are evenly arranged, and the sheath portion 3 wraps them without gaps, and has a substantially circular cross-sectional shape as a whole. ing. Each core part 2 is tapered at the tip side by the chemical solution dissolution process, but does not branch. However, when these core portions 2 are exposed at the front end side, the core portions 2 themselves function as branch portions 4 having substantially the same height. The method of forming the branch portion 4 is the same as that of the first embodiment. Since the chemical solution dissolution rate is faster in the sheath portion 3 than in the core portion 2, the core portion 2 is gradually exposed to the distal end side and the branch portion 4 is exposed. (Branched hair). The branch part 4 made of the core part 2 is also formed in a sharp tapered shape, and the end part of the sheath part 3 is also formed in a tapered shape. Various combinations of the synthetic resin of the core part 2 and the synthetic resin of the sheath part 3 can be adopted as in the first embodiment.

  The core part 2 which forms the several branch part 4 of substantially the same length is not limited to what consists of three like this example, For example, as shown to Fig.7 (a)-(c), a core part 2 may be two or more than three, and in particular, as shown in (c), core portions 2 having different cross-sectional shapes (cross-sectional areas) are combined, and the core portion 2 having a relatively large cross-sectional shape is thick and long. A preferred embodiment is one in which the branch portion 4 is formed and the narrow branch portion 4 is formed by the core portion 2 having a relatively small cross-sectional shape. The shape of each core portion 2 is not limited to a substantially circular shape, and may be an elliptical shape, a triangular shape, a quadrangular shape, a rhombus, a polygonal shape, or other irregular shapes. The outer shape of the sheath 3 is not limited to a circle, and various shapes such as a polygonal shape can be employed. The other configuration is basically the same as that of the first embodiment, and the same structure is denoted by the same reference numeral and description thereof is omitted.

  Next, based on FIGS. 8-11, 3rd Embodiment of this invention is described.

As shown in the XII-XII cross-sectional view of FIG.
Is a multi-leaf shape in which a plurality of side leaf portions 22 having different cross-sectional sizes (cross-sectional areas) are connected around a specific leaf portion 21, and a sheath portion 3 is provided so as to surround the periphery. And has a substantially circular cross-sectional shape as a whole. More specifically, the cross-sectional shape of the core portion 2 has a specific leaf portion 21 having a relatively large cross-sectional shape at the center portion, and four side leaf portions 22 having a relatively small cross-sectional shape are equally disposed around the specific leaf portion 21. It is a shape. The method of forming the branch portion 4 is the same as that of the first embodiment. Since the chemical solution dissolution rate is faster in the sheath portion 3 than in the core portion 2, the core portion 2 is gradually exposed to the distal end side and the branch portion 4 is exposed. (Branched hair). Various combinations of the synthetic resin of the core part 2 and the synthetic resin of the sheath part 3 can be adopted as in the first embodiment. Even in the present embodiment, not all of the core portion 2 exposed from the sheath portion 3 is branched, but an unbranched portion 24 that is not branched remains at the boundary portion with the sheath portion 3 on the exposed proximal end side. It is preferable from the standpoint of bristle strength and prevention of tearing.

  As shown in FIGS. 8 (a) and 8 (b), the core portion 2 having a multi-lobed cross section composed of the specific leaf portion 21 and the side leaf portion 22 having different sizes as in this example is sheathed by a chemical solution dissolution treatment. 3, the front end side exposed from each leaf portion 21, 22 branches, and a relatively long and thick branch portion 4 made up of the specific leaf portion 21, and a relatively short and thin 4 made up of the side leaf portion 22 around it. One branch portion 4 is formed at the filament tip portion 10. Thus, when the length of the tapered tip branch portion 4 of the filament tip portion 10 is different, the long branch portion 4 does not stay on the tooth surface when used as a toothbrush, and the long branch portion 4 has a deep recess between the teeth and the molar crest. In the meantime, the short branch 4 cleans the tooth surface and its uneven parts, and prints all the tooth rows and tooth surfaces with complicated uneven parts and gaps. Can be swept.

  About the form of the specific leaf part 21 and the side leaf part 22 which comprise the multi-leaf shaped cross section of the core part 2, it is not limited to what arranges the four side leaf part 22 equally like this example, for example, As shown in FIGS. 9 (a) and 9 (b), three or two side leafs 22 can be arranged evenly or five or more can be provided. As shown in FIG. You may arrange | position in the biased position. Further, as shown in (d), a plurality of side leaf portions 22 may be provided instead of a plurality. Further, as shown in FIGS. 9E to 9G, the specific leaf portion 21 has a relatively small cross-sectional shape (cross-sectional area), and a side leaf portion 22 having a relatively large cross-sectional shape around the specific leaf portion 21 is a joint portion 6. It may be arranged independently through the. According to this, it is possible to form a relatively short and thin branch portion 4 made of the specific leaf portion 21 at the filament tip portion 10 and a relatively long and thick branch portion 4 around the branch portion 4. Again, the core part 2 has a multi-leaf cross-sectional shape, and if there is no sheath part 3, the outer peripheral surface of the core part 2 is between the specific leaf part 21 and the side leaf part 22 or between the side leaf parts 22. Although the recessed part 23 appears, since these recessed parts 23 are hidden except for the filament tip part 10 due to the presence of the sheath part 3, there is no concern about the adhesion of dirt, which is preferable in terms of hygiene.

  In this example, both the specific leaf portion 21 and the side leaf portion 22 are substantially circular and are connected so that the circles partially overlap each other. However, as in the first embodiment, the intermediate leaf is interposed. The circles may be connected to each other. Moreover, the shape of the specific leaf portion 21 and the side leaf portion 22 is not limited to a substantially circular shape, but may be an elliptical shape, a triangular shape, a quadrangular shape, a rhombus, a polygonal shape, or other irregular shapes. Further, the cross-sectional shapes of the side leaf portions 22 may be different sizes (cross-sectional areas), and the lengths of the branch portions 4 made of the side leaf portions 22 may be different from each other.

  Further, the outer shape of the sheath portion 3 is not limited to a circle, and various shapes such as a polygonal shape can be adopted as in the first embodiment. FIG. 10E illustrates a rectangular shape, FIG. 10F illustrates a rhombus shape, and FIG. 11 illustrates a fan shape. Each of the portions surrounding the recess 23 is thick. It is preferable to form the polygon so that the corner of the polygon is not located in this portion so as not to become too much. As in the above examples, the outer shape of the sheath is set so that the thickness of the sheath 3 is as much as possible. For example, as shown in FIG. 11, if the fan is shaped to have the same thickness around the core portion 2, the tapered portion at the tip of the sheath portion 3 corresponding to the concave portion 23 does not become particularly long as shown in FIG. It can be seen that it is stable with almost no worry about peeling. Further, the outer shape of the sheath portion 3 can be substantially the same as that of the core portion 2. At this time, it is preferable that the recessed part formed in the external shape of the sheath part 3 is a grade which does not adhere dirt. Other configurations are basically the same as those of the first embodiment, and the same structure is denoted by the same reference numeral and description thereof is omitted.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and can of course be implemented in various forms without departing from the gist of the present invention.

Explanatory drawing which shows the toothbrush which implanted the filament which concerns on 1st Embodiment of this invention. Similarly expansion explanatory drawing of the tip flocking part of a toothbrush. Similarly explanatory drawing of the filament for toothbrushes. (A) is explanatory drawing which similarly shows the front-end | tip part of the filament for toothbrushes, (b) is the II sectional drawing, (c) is II-II sectional drawing, (d) is III-III sectional drawing, ( e) IV-IV sectional drawing, (f) VV sectional drawing. (A)-(d) is sectional drawing which similarly shows the modification of the filament for toothbrushes. (A) is explanatory drawing which shows the filament for toothbrushes concerning 2nd Embodiment of this invention, (b) is the VI-VI sectional drawing, (c) is a VII-VII sectional drawing, (d) is VIII- VIII sectional drawing, (e) is IX-IX sectional drawing. (A)-(c) is sectional drawing which similarly shows the modification of the filament for toothbrushes. (A) is explanatory drawing which shows the filament for toothbrushes concerning 3rd Embodiment of this invention, (b) is the XX sectional drawing, (c) is XI-XI sectional drawing, (d) is XII- XII sectional drawing. (A)-(g) is sectional drawing which shows the modification of the filament for toothbrushes similarly. (A)-(f) is sectional drawing which shows the other modification of the filament for toothbrushes similarly. (A) is explanatory drawing which shows the further another modification of the filament for toothbrushes similarly, (b) is the XIII-XIII sectional drawing, (c) is a XIV-XIV sectional drawing.

Explanation of symbols

H Hair length L Dimensions 1 Filament 2, 2A, 2B Core part 3 Sheath part 4 Branch part 5 Toothbrush 6 Joint part 10 Tip part 20 Leaf part 21 Specific leaf part 22 Side leaf part 23 Recessed part 24 Unbranched part 50 Pattern 51 Flocking Part

Claims (7)

  It has a core-sheath structure consisting of a single or a plurality of core parts and a sheath part surrounding the core part, and both the core part and the sheath part are made of a chemical-soluble synthetic resin, and the synthetic resin of the core part is the sheath part It is a resin having a slower chemical solution dissolution rate than the synthetic resin, and has a plurality of sharp tapered branch portions formed of the core portion exposed from the sheath portion by chemical solution dissolution treatment at least one end portion. A toothbrush filament characterized by.   The filament for toothbrushes according to claim 1, wherein the core has a multi-leaf shape or a multi-leaf shape, and the end portion is branched for each leaf portion by a chemical solution dissolution process to form the branch portion.   The filament for a toothbrush according to claim 2, wherein the cross-sectional shape of the core portion is a multi-leaf shape composed of two or more substantially identical leaf portions.   The toothbrush filament according to claim 2 or 3, wherein a cross-sectional shape of the core portion is a multi-leaf shape in which a plurality of side leaf portions are connected around a specific leaf portion.   The toothbrush filament according to any one of claims 1 to 4, wherein the synthetic resin of the core portion and the synthetic resin of the sheath portion are of the same type.   The filament for a toothbrush according to claim 5, wherein the same type of resin is a polyester resin.   A toothbrush comprising the toothbrush filament according to any one of claims 1 to 6 implanted therein.

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