JP5504076B2 - Brush hair material and method for producing the same - Google Patents

Description

  The present invention relates to a bristle material for a brush.

Brush materials such as toothbrushes are required to be excellent in cleaning performance, hard to bend and disperse, flexible and excellent in durability, and various devices have been conventionally made.
For example, as a toothbrush having excellent cleaning performance, a brush material made of polybutylene terephthalate having a tapered tip is made commercially available.
Further, Patent Document 1 describes that the tip of the brush bristle material is tapered and formed into a spiral groove, thereby effectively removing foreign matter adhering to the narrow gap and obtaining an excellent cleaning effect. .

JP 2003-189943 A

However, with a tapered toothbrush with a tapered tip of brush material made of polybutylene terephthalate, the tip of the tapered shape tends to enter a fine gap in the object to be cleaned, but the brush hair hits the object to be cleaned. When used for a toothbrush, it is weak and does not have a sufficient cleaning effect such as a stubborn plaque, and a cleaning effect is not sufficient.
The brush bristle material described in Patent Document 1 specifically has a spiral groove by twisting the monofilament itself, and when used for a toothbrush or the like, the brush bristle material has a groove in the brush bristle material. The object to be cleaned tends to accumulate dirt, and the cleaning effect is not sufficient.
Accordingly, an object of the present invention is to solve the above-described problems and to provide a brush bristle material that does not accumulate dirt even when a minute gap is cleaned and can obtain an excellent cleaning effect.

  That is, the present invention is a brush bristle material comprising a covering yarn in which a sheath yarn is wound around a core yarn, and the core yarn and the sheath yarn are composed of a core-sheath type composite fiber in which a fusion component is exposed on the fiber surface. Thus, the core yarn and the sheath yarn are bristle materials for brushes in which the respective fusion components are fused and brought into surface contact and fixed, and the number of windings of the sheath yarn is 200 to 2000 turns / m. Among them, those in which the fusion component of the core yarn and the sheath yarn are the same component are preferable, and the value obtained by dividing the length of the major axis of the fiber cross section of the brush hair material by the length of the minor axis is 1.05. More preferably, it is -1.3. The core yarn is composed of a core-sheath type composite fiber monofilament whose core component is polybutylene terephthalate and the sheath component is a polyethylene terephthalate copolymerized with a third component. The sheath yarn is composed of polyethylene terephthalate and the sheath component is third. What consists of a core-sheath-type composite fiber monofilament which is the copolymerization polyethylene terephthalate which copolymerized the component is more preferable. These bristle materials for brushes can be particularly suitably used for toothbrushes.

  Further, the present invention provides a core yarn and a sheath yarn by using a core-sheath type composite fiber having a lower melting point of the sheath component than that of the core component for the core yarn and the sheath yarn so that the winding number is 200 to 2000 times / m. Of a bristle material for a brush that is heat-set at a temperature higher than the melting point of the sheath component of the core yarn and lower than the melting point of the core component of the core yarn and the sheath yarn, so that the sheath component of the core yarn and the sheath yarn is fused and fixed by surface contact It is also a method. In addition, these brush hair materials may be further tow-processed and cut, or after cutting, the hair tip components may be further dissolved into a tapered shape to produce brush hair materials.

  According to the bristle material for a brush of the present invention, since the core yarn and the sheath yarn are composed of covering yarns that are fused and fixed by surface contact, there is no groove on the side surface of the bristle material, and the shape has regular protrusions. Fine dirt can be captured on the side surface of the bristle material, and even when a thin minute gap is cleaned, the object to be cleaned does not enter the groove, and an excellent cleaning effect can be obtained. In addition, both the core yarn and the sheath yarn are made of a core-sheath type composite fiber, and are fused and fixed by the fusion components in surface contact with each other. It is excellent in recoverability when pressure is applied to the hair material and has a good feeling when used in a brush.

The example of the fiber cross-sectional shape of the core-sheath-type composite fiber used for this invention is shown. It is a schematic diagram explaining the fiber cross section of this invention and the conventional bristle material for brushes. It is an example of the schematic diagram which shows the side surface of the bristle material for brushes of this invention. An example of the electron micrograph of the fiber cross section of the bristle material for brushes of this invention is shown. An example of the electron micrograph of the bristle material for brushes of this invention is shown. An example of the electron micrograph of the bristle material for brushes of this invention is shown. An example of the electron micrograph of the bristle material for brushes of this invention is shown. An example of the electron micrograph of the bristle material for brushes of this invention is shown.

  The present invention is a bristle material for a brush comprising a covering yarn in which a sheath yarn is wound around a core yarn.

  The core yarn and sheath yarn may be made of multifilament or monofilament. That is, the core yarn and sheath yarn may be monofilament, the core yarn may be multifilament, the sheath yarn may be monofilament, the core yarn may be monofilament, the sheath yarn may be multifilament, and the core yarn and sheath yarn may be multifilament. Of these, the core yarn and the sheath yarn are preferably monofilaments.

The core yarn and the sheath yarn are made of a core-sheath type composite fiber in which a fusion component is exposed on the fiber surface, and the core yarn and the sheath yarn are fixed in contact with each other by fusing the respective fusion components.
Here, the core yarn and the sheath yarn are fused and fixed so that the respective fused components are fused and brought into surface contact with each other means that the two components are fused and fixed so as not to be separated.

First, the core yarn constituting the present invention will be described.
The core yarn of this invention is comprised from the core-sheath-type composite fiber which has a core part and a sheath part.
The core yarn is preferably a core-sheath type composite fiber filament, and may be a monofilament or a multifilament, but more preferably a monofilament.

  As the core component constituting the core of the core-sheath composite fiber of the core yarn, a thermoplastic resin such as a polyester such as polyethylene terephthalate or polybutylene terephthalate, or a polyamide such as nylon 6, nylon 610, or nylon 612 can be used. . Of these, polybutylene terephthalate, nylon 610 and the like are preferable from the viewpoint of giving the brush bristle a firm waist.

  As the sheath component constituting the sheath portion of the core-sheath type composite fiber of the core yarn, thermoplastic resins having various fiber forming properties can be used, but a fusion component described later is preferable.

  As the fusion component of the core-sheath type composite fiber of the core yarn, those having a lower melting point (softening point in the case of amorphous) than the thermoplastic resin constituting the core component are preferably used. This fusion component preferably has a melting point (softening point in the case of amorphous) of 20 ° C. or more lower than components other than the fusion component such as the core component (hereinafter referred to as non-fusion component). . More preferably, it is 30 ° C. or more lower.

  As the fusion component, for example, when the core component is a polyester, a polyester having a lower melting point (softening point in the case of amorphous) than the core component is preferable, and in particular, a polyester copolymerized with a third component (hereinafter referred to as a “polyester”) Copolymerized polyester) is preferred.

  The copolymer polyester is preferably a copolymer polyethylene terephthalate containing terephthalic acid and ethylene glycol as main components and a third component as a copolymer component, and the copolymer components include oxalic acid, malonic acid, and azelain which are acid components. Aliphatic dicarboxylic acids such as acids, adipic acid and sebacic acid, aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and naphthalenedicarboxylic acid and / or alicyclic dicarboxylic acids such as hexahydroterephthalic acid and diethyl glycol, polyethylene glycol, Contains one or a combination of two or more aliphatic, alicyclic or aromatic diol glycols such as propylene glycol, hexanediol, paraxylene glycol, bishydroxyethoxyphenylpropane, etc. In response to the Copolymerized polyester oxy acids such as La-hydroxybenzoic acid was added in an amount of 50 mol% or less.

  Of these, polyesters obtained by copolymerizing terephthalic acid and ethylene glycol by adding isophthalic acid are particularly preferable. And in such isophthalic acid copolymerized polyester, what made 10-30 mol% copolymerization of the isophthalic acid component is preferable from the point of the ease of a fusion | melting fixation, and a handleability. In addition, it can adjust so that it may become a desired melting | fusing point or a softening point by changing the copolymerization ratio of the said component monomer.

As the core-sheath type composite fiber of the core yarn, a core-sheath type composite fiber filament in which the core part is composed of a non-fusion component and the sheath part is composed of a fusion component is preferably exemplified.
As the composite form of this core-sheath-type composite fiber, in addition to those having a complete core-sheath structure in the cross-sectional shape of the fiber, there are various types in which at least a part of the fusion component is exposed on the surface. The thing of a composite form is mentioned. For example, a composite fiber having a fiber cross-sectional shape as shown in FIGS. In these drawings, the hatched portion indicates the portion formed with the fusion component, and the white portion indicates the portion formed with the non-fusion component. Also, the cross-sectional contour shape does not necessarily have to be circular, and various cross-sectional shapes such as an ellipse, a hollow, a triangle, a quadrangle, and a star can be used. In addition, the core of the core part may have a single-core or multi-core cross-sectional shape. And although the core of a core part may be either concentricity and eccentricity, it is preferable to make it concentric.

  Among these composite fibers, those in which the fusion component is exposed to 50% or more on the fiber surface are suitable. That is, if the fusion component is exposed to 50% or more on the fiber surface, the sheath yarn can be sufficiently fused and fixed. More preferably, 70% or more is exposed, and more preferably only the fusion component is exposed on the fiber surface. It is particularly preferable to use a core-sheath type composite fiber in which a fusion component is arranged in the sheath part and a non-fusion component is arranged in the core part as shown in FIG.

  Further, as a core-sheath type composite fiber of the above-mentioned core yarn, a particularly preferred combination is a core component of polybutylene terephthalate, and a sheath component is a low melting point polyester having a lower melting point (softening point in the case of amorphous) than the core component. A core-sheath type composite fiber filament is mentioned. That is, since the core component is polybutylene terephthalate, the bristle material for the brush has a firm waist, and since the sheath component is the low melting point polyester, the handleability is good. Above all, the core component is polybutylene terephthalate, and the sheath component is copolymer polyethylene terephthalate, the brush hair material has a firm feeling of the back, and the brush hair material is prone to excellent hair fall recovery, Particularly preferred. In addition, it is preferable to use, as the sheath component, a mixture of copolymer polyethylene terephthalate and the same resin (polybutylene terephthalate) as the core component because the affinity between the core component and the sheath component is improved.

  In the core-sheath composite fiber filament of the core yarn, it is preferable that the sheath component contains a component in which the core component and the component having the main repeating unit are the same, thereby increasing the affinity between the core component and the sheath component. It is preferable from the point, More preferably, the sheath component contains the same resin as the core component. For example, when the core component is polyethylene terephthalate, the sheath component contains polyethylene terephthalate or copolymerized polyethylene terephthalate in addition to the fusion component. As another example, polybutylene terephthalate is contained in the core component, and polybutylene terephthalate is contained in the sheath component in addition to the fusion component. The method of containing other resin in addition to the fusion component is not particularly limited, but for example, melt blended by tip blending, kneading with a biaxial kneader, etc. Can be mentioned. Of these, those mixed by kneading are preferred.

  The difference in melting point between the core component and the sheath component of the core-sheath composite fiber of the core yarn is preferably 50 to 100 ° C. from the viewpoint of maintaining the rigidity of the brush bristle material, and the difference in softening point is 150 to 180. ° C is preferred.

  The ratio of the core component to the sheath component (volume ratio) of the core-sheath composite fiber of the core yarn is 1: 7 to from the viewpoint of maintaining the fusion property with the sheath yarn and the rigidity as the brush hair material. 4: 1 is preferable, and 1: 5 to 3: 1 is particularly preferable.

  Further, from the viewpoint of maintaining appropriate rigidity and bend recovery, the breaking strength of the core yarn is preferably 2.0 to 8.0 cN / dtex, and the breaking elongation is more preferably 10 to 40%. .

The fineness of the core yarn can be appropriately set according to the purpose, but is preferably 10 to 1400 dtex, more preferably 20 to 800 dtex, and particularly preferably 200 to 500 dtex from the viewpoint of productivity. .
For example, when using for a toothbrush, it is preferable that it is 200-600 dtex, it is preferable that it is 200-500 dtex, More preferably, it is 220-400 dtex. When using for an interdental brush, 5-160 dtex is preferable and it is more preferable that it is 20-110 dtex. When using for a makeup brush, 50-500 dtex is preferable, More preferably, it is 100-400 dtex. Moreover, when using for a nail polish brush, 40-100 dtex is preferable and 70-80 dtex is more preferable. When used for a brush pen, 100 to 200 dtex is preferable, and about 130 to 160 dtex is more preferable. When used for an industrial cleaning brush, for example, 250 to 800 dtex is preferable. In general, when used for industrial purposes, it is often about 20 to 1000 dtex.

Next, the sheath yarn constituting the bristle material for brushes of the present invention will be described.
The sheath yarn of this invention is comprised from the core-sheath-type composite fiber which has a core part and a sheath part.
The sheath yarn is preferably a core-sheath type composite fiber filament, and may be a monofilament or a multifilament, but more preferably a monofilament.

  As the core component constituting the core portion of the core-sheath-type composite fiber of the sheath yarn, a thermoplastic resin such as polyester such as polyethylene terephthalate or polybutylene terephthalate, polyamide such as nylon 6, nylon 610, or nylon 612 can be used. . From the viewpoint of general use and easy handling, polyethylene terephthalate is preferable.

  As the fusion component of the core-sheath type composite fiber of the sheath yarn, those having a melting point (softening point in the case of amorphous) are preferably used as compared with the thermoplastic resin constituting the core component. The fusion component preferably has a melting point (softening point in the case of amorphous) of 20 ° C. or more lower than that of the non-fusion component. More preferably, it is 30 ° C. or more lower.

  As the fusion component of the sheath yarn, for example, when the core component is polyester, a polyester having a lower melting point (softening point in the case of amorphous) than the core component is preferable, and a copolymer polyester is particularly preferable.

  The copolymer polyester is preferably a copolymer polyethylene terephthalate containing terephthalic acid and ethylene glycol as main components and a third component as a copolymer component, and the copolymer components include oxalic acid, malonic acid, and azelain which are acid components. Aliphatic dicarboxylic acids such as acids, adipic acid and sebacic acid, aromatic dicarboxylic acids such as phthalic acid, isophthalic acid and naphthalenedicarboxylic acid and / or alicyclic dicarboxylic acids such as hexahydroterephthalic acid and diethyl glycol, polyethylene glycol, Contains one or a combination of two or more aliphatic, alicyclic or aromatic diol glycols such as propylene glycol, hexanediol, paraxylene glycol, bishydroxyethoxyphenylpropane, etc. In response to the Copolymerized polyester oxy acids such as La-hydroxybenzoic acid was added in an amount of 50 mol% or less.

  Of these, polyesters obtained by copolymerizing terephthalic acid and ethylene glycol by adding isophthalic acid are particularly preferable. And in such an isophthalic acid copolymer polyester, what made 10-30 mol% copolymerization of the isophthalic acid component is preferable from the point of the ease of a fusion | melting fixation, and a handleability. In addition, it can adjust so that it may become a desired melting | fusing point or a softening point by changing the copolymerization ratio of the said component monomer.

Preferred examples of the core-sheath type composite fiber constituting the sheath yarn include core-sheath type composite filaments in which the core part is composed of a non-fusion component and the sheath part is composed of a fusion component.
As the composite form of this core-sheath-type composite fiber, in addition to those having a complete core-sheath structure in the cross-sectional shape of the fiber, various types in which at least a part of the fusion component is exposed on the surface The thing of a composite form is mentioned. For example, a composite fiber having a fiber cross-sectional shape as shown in FIGS. In these drawings, the hatched portion indicates the portion formed with the fusion component, and the white portion indicates the portion formed with the non-fusion component. Also, the cross-sectional contour shape does not necessarily have to be circular, and various cross-sectional shapes such as an ellipse, a hollow, a triangle, a quadrangle, and a star can be used. In addition, the core of the core part may have a single-core or multi-core cross-sectional shape. And although the core of a core part may be either concentricity and eccentricity, it is preferable to make it concentric.

  Of these composite fibers, those in which the fusion component is exposed to 70% or more on the fiber surface are particularly suitable. That is, if the fusion component is exposed to 70% or more on the fiber surface, the sheath yarn can be sufficiently fused and fixed. More preferably, 90% or more is exposed, and more preferably only the fusion component is exposed on the fiber surface. In particular, as shown in FIG. 1 (a), it is preferable to use a core-sheath type composite fiber in which a fusion component is arranged in the sheath portion and a non-fusion component is arranged in the core portion.

  Moreover, as a core-sheath-type composite fiber of the above-mentioned sheath yarn, a particularly preferred combination is a core whose core is polyethylene terephthalate and whose sheath component is a low melting point polyester having a lower melting point (softening point in the case of amorphous) than the core component. A sheath type composite fiber filament is mentioned. This is preferable because the sheath component is a low-melting polyester, and it is easy to stably obtain a good feeling of elasticity and a cleaning effect by fusing and fixing with the fusion component in the sheath component of the core yarn. Among these, those in which the core is polyethylene terephthalate and the sheath is copolymerized polyethylene terephthalate are particularly preferable because the above effects are more excellent. In addition, it is preferable to use, as the sheath component, a mixture of copolymer polyethylene terephthalate and the same resin (polybutylene terephthalate) as the core component because the affinity between the core component and the sheath component is improved.

  The core-sheath-type composite fiber filament of the above-described sheath yarn is characterized in that the sheath component contains a component having the same component as the core component and the main repeating unit, which increases the affinity between the core component and the sheath component. More preferably, the sheath component contains the same resin as the core component. For example, when the core component is polyethylene terephthalate, the sheath component may contain polyethylene terephthalate or copolymerized polyethylene terephthalate in addition to the fusion component. Another example is that the core component contains polybutylene terephthalate and the sheath component contains polybrylene terephthalate in the sheath component in addition to the fusion component. The method of containing other resin in addition to the fusion component is not particularly limited, but for example, melt blended by tip blending, kneading with a biaxial kneader, etc. Can be mentioned. Of these, those mixed by kneading are preferred.

  The melting point difference between the core component and the sheath component of the sheath-core composite fiber filament of the sheath yarn is preferably 50 to 100 ° C. from the viewpoint of ease of handling during processing, and the difference in softening point is 150 to 180 ° C. Is preferred.

  The ratio (volume ratio) between the core component and the sheath component of the core-sheath type composite fiber of the sheath yarn is 1: 7 to from the viewpoint of maintaining the fusion property with the core yarn and good rigidity as a brush hair material. 3: 1 is preferable, and 1: 3 to 2: 1 is particularly preferable.

  From the viewpoint of covering workability, the breaking strength of the sheath yarn is preferably 3.0 to 6.0 cN / dtex, and the breaking elongation is preferably 20 to 50%.

Although the fineness of the sheath yarn can be appropriately set according to the purpose, it is preferably 5 to 500 dtex, more preferably 8 to 100 dtex from the balance with the core yarn and productivity.
Moreover, in the case of the toothbrush bristle material, 5-110 dtex is preferable, for example, 5-80 dtex is more preferable, and 20-60 dtex is especially preferable. And in the case of the hair material for makeup brushes, 5-100 dtex is preferable and 10-60 dtex is more preferable, for example. When used for an industrial cleaning brush, for example, 5 to 80 dtex is preferable. When using for an interdental brush, 5-20 dtex is preferable. Moreover, when using for a nail polish brush, 5-20 dtex is preferable. When using for a brush pen, 5-30 dtex is preferable. In general, when used for industrial purposes, it is preferably about 5 to 110 dtex.

  Next, the covering yarn constituting the bristle material for brush of the present invention will be described.

  The covering yarn is obtained by winding the sheath yarn around the core yarn. As a particularly suitable combination, the covering yarn comprises a core-sheath type composite fiber in which the core component is polybutylene terephthalate and the sheath component is copolymerized polyethylene terephthalate. Examples include core yarns and sheath yarns made of core-sheath composite fibers in which the core component is polyethylene terephthalate and the sheath component is copolymer polyethylene terephthalate. This is made of polybutylene terephthalate, which is the core component of the core yarn, and can be given a sense of waist, and the sheath component of the core yarn, the sheath component of the sheath yarn, and the respective fusion components can be fused and fixed. The core component of the thread is easy to handle with polyethylene terephthalate, and as a result, the cleaning effect is also good, the back feeling of the brush bristle material is firm, and the fallenness recovery property of the brush bristle material is likely to be excellent, suitable. is there.

  In addition, the sheath component of the core-sheath type composite fiber of the core yarn and the sheath component of the core-sheath type composite fiber of the sheath yarn are the same type of resin or have the same softening point (for example, + −10 ° C.). ) Is preferable. If the same kind of resin or softening point is the same, the adhesive surface of the core yarn and sheath yarn can be integrated without peeling when fused and fixed, so it is easy to handle when molding a brush. Are better. Further, it is difficult to form a groove between the core yarn and the sheath yarn, and the groove is not contaminated, so that the cleaning effect is excellent. In addition, the sheath yarn and the core yarn are easy to be fused and fixed, and the core yarn and the sheath yarn are difficult to peel off. It tends to be a hair material.

  The sheath yarn preferably has a winding number of 200 to 2000 turns / m. Among them, the sheath yarn is more preferably wound around the core yarn by applying a real twist in the Z-twisting or S-twisting direction in the range of the number of windings of 200 to 1000 turns / m, and particularly 300 to 1500. A range of times / m is preferred. That is, if the number of windings is too small, the spacing between the protruding portions on the surface of the yarn becomes too large, making it difficult to remove dirt, and if it is too large, the sheath yarn will float and the surface of the yarn will be evenly spiraled. There is a tendency that the formation of the part becomes difficult, and the cleaning effect and the handleability may be inferior. When the thickness is in the above range, the protrusions on the yarn surface are likely to be uniform spirals at appropriate intervals, and an excellent cleaning effect can be obtained.

  The covering yarn may be single covering or double covering, but single covering is more preferable from the viewpoint of cleaning effect and usability.

  The fineness of the covering yarn can be set as appropriate, but is preferably 15 to 1500 dtex, and more preferably 25 to 600 dtex, for example. In the case of a toothbrush bristle material, 200 to 600 tex is preferable, and 220 to 400 dtex is more preferable. Moreover, in the case of the bristle material for interdental brushes, 10-160 dtex is preferable and 20-110 dtex is more preferable. And in the case of the hair material for makeup brushes, 50-500 dtex is preferable and 60-350 dtex is more preferable. When used as a nail polish brush, 50-100 dtex is preferable and 80-90 dtex is more preferable. When used for a brush pen, 100 to 200 dtex is preferable, and about 135 to 160 dtex is more preferable. When used for an industrial brush, for example, 250 to 800 dtex is preferable, and 390 to 610 dtex is more preferable. And generally in the case of an industrial use, 55-1500 dtex is preferable.

  The fineness ratio between the core yarn and the sheath yarn used for the covering yarn is preferably 20: 1 to 5: 1. Particularly preferred is 15: 1 to 6: 1. Within this range, the long axis / short axis (value obtained by dividing the length of the long axis minus the length of the short axis) can be easily maintained within an appropriate range, and the cleaning effect is excellent. Become.

Next, the brush hair material of the present invention will be described with reference to the drawings.
In the bristle material for brushes of the present invention, the core yarn and the sheath yarn are fixed with their respective fusion components in surface contact. FIG. 2A is a schematic diagram of an example of a fiber cross section of a bristle material when these fusion components are fixed in surface contact, and FIG. 2B is an example of a fiber cross section in the case of point contact. FIG.
Here, when the fusion component is fixed in point contact, a tight gap is formed between the core yarn and the sheath yarn as shown in FIG. Dirt enters the tip indicated by the arrow in the figure, and the dirt accumulates, resulting in an insufficient cleaning effect. On the other hand, when it is fixed in surface contact with the respective fusion components of the core yarn and the sheath yarn as shown in FIG. 2A, since there is no groove as described above, fine dirt does not enter and accumulate, Since the cleaning effect by the sheath yarn having the protrusion is obtained, the cleaning effect is excellent.
That is, when there is no groove as described above and the regular protrusion on the side surface of the fiber is present in the brush hair material like the brush hair material of the present invention, dirt is collected in the hair material groove. The fine dirt can be captured by the protrusions on the side surfaces of the fibers, and the cleaning effect is excellent.

  These functions and effects will be described by exemplifying the case where they are used for brushing teeth. Toothbrushing is usually performed by brushing with the tip of a toothbrush at right angles to the teeth in the oral cavity, and the teeth on the opposite side of the handle can be brushed well by brushing, but the tip of the hair on the inside of the teeth on the side of the handle It is difficult to apply, and it is known that there are many caries. In the case where the monofilament itself as in Patent Document 1 has a spiral groove, there is no protrusion on the side surface of the thread, but there is no protrusion. However, if there are no grooves and protrusions as in the present invention, it will be easier to apply the protrusions on the side of the thread to the inside of the tooth row on the handle side of the brush. Since it can be captured and an excellent cleaning effect can be obtained, it can be expected to prevent tooth decay.

In addition, such protrusions do not accumulate dirt in the grooves and have an excellent cleaning effect, but also solids such as toothpaste, drugs, paints, cosmetic powders, nail polish, ink, etc. between the protrusions. Easy to contain liquid. Moreover, since there is no groove | channel and it can remove easily what was included, various effects can be exhibited by each use. For example, in the case of a cosmetic brush containing cosmetic powder, a lot of cosmetic powder can be included between the protrusions, and even when the cosmetic powder is swept away, it does not get into the groove and accumulate, so there is no makeup powder separation It becomes good and easy to handle.
A toothbrush containing toothpaste also contains plenty of toothpaste, so that it becomes easy to remove toothpaste after use.

  In order to obtain such a protrusion, a core-sheath composite fiber made of polyethylene terephthalate copolymerized with polybutylene terephthalate as the core component and a third component as the sheath component is used as the core yarn, and polyethylene terephthalate is used as the core component. It is preferable that the third component is a copolymerized polyethylene terephthalate, and the core-sheath composite fiber in which the copolymer polyethylene terephthalate is made of the same type of resin as the fusion component of the core yarn is a covering yarn having a sheath yarn, The above effects can be obtained more effectively. In particular, when used as a bristle material for toothbrushes, the tip of the hair does not sag, it has a waist, it is soft and excellent in feeling of use, does not open, and has excellent cleaning effect and durability. .

Further, when L in FIG. 2A is the maximum value of the fiber diameter (long axis) and S is the minimum value of the fiber diameter (short axis), the long axis / short axis (the length of the long axis is the length of the short axis). The value divided by 3 is preferably about 1.05 to 1.3, and more preferably 1.1 to 1.2.
This range is preferable because it is excellent in cleaning effect and hardly falls down. That is, if it is in this range, a suitable protrusion is wound around the core yarn, so that dirt is easily captured and easily removed. In addition, when the ratio of the major axis is too large, the sheath yarn is distorted in the twist direction, and it is difficult to maintain straightness and the hair tends to fall down. Therefore, the above range is preferable.

  In addition, when setting it as bristle materials for toothbrushes, 0.5-5 mm is preferable and, as for the pitch (P of FIG. 3) of a sheath thread, it is more preferable that it is 1-4 mm.

Further, the outer periphery of the core yarn and the outer periphery of the sheath yarn are in surface contact with each other, but referring to the fiber cross-section of the brush hair material, the sheath yarn is 2-40% with respect to the outer periphery of the core yarn. It is preferably in contact with the yarn.
Within this range, it is easy to balance the long axis and the short axis, which is preferable for obtaining the effects of the present invention. More preferably, it is 5 to 30%.

  Moreover, the bristle material for brushes of this invention can use the fiber which has electroconductivity for a core thread and a sheath thread.

  And the bristle material for brushes of the present invention preferably has a breaking strength of 2 to 6 cN / dtex from the viewpoint of ease of use and ease of handling when manufacturing a brush, and has superior bending rigidity. In view of the above, it is preferable that the elongation at break is 20 to 40%.

Next, an example of the manufacturing method of the bristle material for brushes of this invention is demonstrated.
First, the sheath yarn is appropriately wound around the core yarn and covered to obtain a covering yarn. The obtained covering yarn is wound while being heat-set at a temperature higher than the melting point of the core component of the core yarn and the sheath yarn and lower than the melting point of the core component of the core yarn and the sheath yarn. The bristle material for brushes of the present invention can be obtained by fusing and fixing by surface contact. The obtained bristle material for a brush is further cut after being tow-processed, and processed if necessary. Examples of the processing method include round processing or taper processing of the hair tips. Next, after the obtained bristle material for a brush is appropriately planted on a base material, a desired brush can be obtained.

  In the covering, the number of windings is preferably 200 to 2000 times / m. In the case of a toothbrush, 500 to 1000 times / m is preferable.

The temperature and time of the heat setting can be appropriately set depending on the polymer used for the core yarn and the sheath yarn. For example, the heat setting is preferably performed at a temperature that is 50 to 80 ° C. higher than the melting point of the fusion component and lower than 10 to 40 ° C. that is the melting point of the core component of the core yarn and sheath yarn. The melting point here indicates a softening point in the case of an amorphous material. The heat set time is preferably about 1 to 30 seconds, for example.
For example, a core-sheath type composite fiber monofilament whose core component is polybutylene terephthalate and a sheath component is polyethylene terephthalate copolymerized with a third component is the same copolymer as the core yarn, the core component is polyethylene terephthalate, and the sheath component is the sheath yarn of the core yarn When the core-sheath type composite monofilament of polyethylene terephthalate is used as the sheath yarn, for example, the heat setting temperature is preferably 200 to 250 ° C., the heat setting time is preferably 1 to 30 seconds, and the winding speed is 40 to 60 seconds / m. Preferably there is.

  Further, the hot water shrinkage rate of the core yarn is preferably 5 to 20%, and the hot water shrinkage rate of the sheath yarn is preferably 5 to 20%. The difference in hot water shrinkage between the core yarn and the sheath yarn is preferably about 0 to 10%. With such a hot water shrinkage rate, the sheath thread is appropriately shrunk, so that the fusion component is sufficiently easy to come into surface contact, and when cleaned, dirt enters and accumulates in the gaps in the hair material. Can be prevented.

  Moreover, although the cut after tow | toe processing can be cut into suitable length according to the objective, in the case of a toothbrush, it is preferable that it is 30-50 mm, for example.

If the brush bristle material is made of polyester such as polyethylene terephthalate, it is cut, dipped in an alkaline aqueous solution, and gradually lifted to reduce the tip of the hair, with a round-shaped tip or taper. A hair tip having a shape can be easily obtained.
The brush bristle material of the present invention is fixed by firmly fusing and fixing the core yarn fusion component and the sheath yarn fusion component even if such round processing or taper processing is performed. Since it is firmly reinforced, a good cleaning effect can be obtained without sagging even if a tapered portion is inserted into a fine gap between objects to be cleaned such as between teeth.

Next, the present invention will be described more specifically with reference to examples.
In addition, the physical property in an Example and a comparative example was performed with the following method.
(Hot water shrinkage)
JIS L1013 8.18.1 b) Measured by filament shrinkage (method B).
(Dry heat shrinkage)
JIS L1013 8.18.2 b) Measured by filament shrinkage (method B).
(Softening point)
JIS K7196 It measured by the softening temperature test method by the thermomechanical analysis of a thermoplastic film and a sheet | seat.
(Melting point)
Measured by the method of measuring the transition heat of JIS K7122 plastic.
(Bending hardness and bending recovery)
KES-FB measurement system It measured by the bending characteristic test method system. In addition, bending hardness is so hard that a numerical value is large, and recovery property is so bad that a bending recovery property is large.
(Young's modulus)
JIS L1013 8.10 Remarks 2. It was measured by.
(Breaking strength and breaking elongation)
In accordance with JIS-L-1013, using an AGS-1KNG autograph tensile tester manufactured by Shimadzu Corporation, the strength when the sample stretches and breaks under the conditions of a sample yarn length of 20 cm and a constant speed tensile speed of 20 cm / min. The elongation was determined.

[Example 1]
As core yarn X, the core component is polybutylene terephthalate (softening point: 220 ° C., melting point 220-230 ° C.), and the sheath component is copolymerized polyethylene terephthalate copolymerized with 25 mol of isophthalic acid (softening point: 70 ° C., melting point 160 ° C. 280 dtex core-sheath composite fiber monofilament (hot water shrinkage: 7.6%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 170 μm, core-sheath ratio 3: 1).
As the sheath yarn Y, the core component is polyethylene terephthalate (softening point: 238 to 240 ° C., melting point: 255 to 260 ° C.), and the sheath component is copolymerized polyethylene terephthalate copolymerized with 25 mol of isophthalic acid (softening point: 70 ° C., melting point) 160 ° C) 28 dtex core-sheath composite fiber monofilament (hot water shrinkage: 7%, dry heat shrinkage at 180 ° C: 15%, fiber diameter 50 µm, core-sheath ratio (volume ratio) is 2: 1) did.
Covering was performed by winding the sheath yarn Y around the core yarn X in a spiral shape with a gap so that the number of windings was 500 turns / m under the following conditions.
The obtained covering yarn was wound at a winding speed of 60 m / min (heating time to the yarn of 1 second) while performing heat setting at a set temperature of 220 ° C. to obtain a brush hair material. The physical properties of the obtained hair material are shown below. Moreover, the micrograph of the fiber cross section of the obtained hair material is shown in FIG. 4, and the micrograph of the fiber viewed from the side is shown in FIG. A 20% sheath yarn was in contact with the outer periphery of the core yarn.
<Physical properties of hair material>
Fineness: 365 dtex
Pitch: 1.7mm
Fineness ratio: 10: 1
Breaking strength: 4.2 cN / dtex
Elongation at break: 36%
Young's modulus: 3512 N / mm ²
Long axis: 220 μm
Short axis: 185μm
Long axis / short axis: 1.17
Hot water shrinkage: 3.7%
The obtained hair material was tow-processed and cut into 30 mm. The obtained bristle material had a bending hardness of 0.2115 cN · cm ² / cm / yarn and a bending recovery property of 0.0396 cN · m / m / yarn.

  Next, the tip is immersed in an alkaline solution at a temperature of 60 ° C. and a concentration of 30%, pulled up stepwise, one is reduced to a taper shape of 30% (10 mm), the other is reduced to a round shape, and then the toothbrush A toothbrush was obtained by flocking the head portion of the substrate. FIG. 6 shows a photomicrograph of the hair end reduced to a tapered shape as seen from the side. The bristles of this brush had good bending hardness and resilience when in contact with the teeth, and were excellent in the cleaning effect of fine parts. In addition, the condition of the hair on the side of the hair was excellent, and the dentition including the part where the hair tip was hard to reach could be polished. In addition, even after brushing 3 times a day for 2 weeks, the toothbrush did not accumulate scales and the cleaning effect remained excellent.

[Comparative Example 1]
When a bristle material having a diameter of 179 μm was collected from a commercially-available toothbrush whose bristle material is generally made of nylon, the bending hardness and the bending recovery were measured in the same manner as in Example 1. The bending hardness was 0. 1789 cN · cm ² / cm / yarn, and the bending recovery property was 0.0413 cN · m / m / yarn.
When it was used as a toothbrush, it had no waist compared to that of Example 1, the cleaning effect was inferior, and the recovery of bristle material was also inferior.

[Comparative Example 2]
30 mm of a bristle material was collected from a commercially-available toothbrush having a bristle terephthalate made of polybutylene terephthalate, and the bending hardness and bend recovery were measured at a non-tapered part having a diameter of 194 μm.
Bending hardness: 0.2453 cN · cm ² / cm / yarn
Flexural recovery: 0.0414 cN · m / m / yarn
When used as a toothbrush, it was hard and inferior in usability compared to Example 1. In addition, the plaque cleaning effect and the bending recovery were inferior.

[Comparative Example 3]
A toothbrush made of a bristle material made by twisting a monofilament with a square cross-section with a side of 150 μm and a square cross section of 3 mm / 1 time (333 times / m) was prepared. This was a twisted groove and a shape with square corners but no protrusions. 30 mm of bristle material was collected from the toothbrush, and bending hardness and bending recovery were measured.
Bending hardness: 0.1918 cN · cm ² / cm / yarn
Bending recovery: 0.0415 cN · m / m / yarn
When used as a toothbrush, the cleaning condition was better than those of Comparative Examples 1 and 2, but the dirt on the inner side of the dentition on the dominant hand side was difficult to remove, and the cleaning condition of Example 1 was superior. When I brushed my teeth three times a day for two weeks, water stains accumulated in the groove. This scale did not fall off to the extent that it was lightly washed after brushing the teeth.

  As described above, the brush bristle material of Example 1 of the present invention has a firmer and firmer feeling than the nylon of Comparative Example 1, and is more flexible than the polybutylene terephthalate of Comparative Example 2. It was not hard. Moreover, the bristle material for brushes of Example 1 is more excellent in bending recovery than those of Comparative Examples 1 to 3, and good durability can be expected as the bristle material for brushes.

  Next, for the toothbrushes of Example 1 and Comparative Examples 1 to 3, the following cleaning evaluation, evaluation of falling over hair, and evaluation of openness were performed.

(Cleaning evaluation)
The toothbrush of Example 1 and the toothbrushes of Comparative Examples 1 to 3 were set in an abrasion tester at an angle of 10 degrees, and a white toothpaste was uniformly applied to a width of 2 cm on a black plastic sheet. Cleaning performance was evaluated by three reciprocating strokes while shifting the surface by 1 mm on the side of the toothbrush.
The toothbrush of Example 1 had a small amount of white toothpaste remaining on the black plastic sheet, but those of Comparative Examples 1 to 3 had a large amount of white toothpaste (Comparative Examples 1 and 2). 3 remained in the order of 3). In addition, although the thing of Example 1 contained toothpaste between the protrusions, and the thing of Comparative Example 1 contained between the grooves, the thing of Example 1 had more toothpaste.

(Evaluation of hair fallability and openness)
In addition, the toothbrushes of Example 1 and Comparative Examples 1 to 3 were set vertically on an abrasion tester, and a black plastic sheet was installed. The openability was evaluated. The hair fallability was evaluated visually with ◎ for those that did not fall down at all, ◯ for those that had almost no hair fall, △ for those that had fallen a little, and x for those with severe hair fall. In addition, the openness of the brush was evaluated as ◎ when the hair was not open at all, ◯ when there was almost no open, △ when there was a little open, and × when it was quite open. These results are shown below.

From the above, it can be seen that the product of Example 1 is superior in cleaning effect as compared to the comparative product, has a feeling of elasticity, is difficult to fall down, does not easily open, and has good durability. Moreover, although the thing of Example 1 is excellent in the cleaning effect, it turns out that darkening, such as scale, does not adhere to the side surface of a brush hair.
In addition, although the thing of the comparative example 3 becomes what is easy to open, this is the heat set at high temperature of about 220 degreeC, for example, in order to give the straightness of a filament, twisting the monofilament which consists of a polybutylene terephthalate. Since heat treatment is required, it is assumed that this heat treatment will loosen the polymer orientation, worsen the bend recovery, promote wear, and open the brush bristles quickly.

[Examples 2 to 4, Comparative Examples 4 and 5]
A toothbrush was obtained in the same manner as in Example 1 except that the winding number of the sheath yarn Y was changed to 150 times / m, 200 times / m, 1000 times / m, 2000 times / m, and 2200 times / m. The number of windings of 500 times / m (Example 1) and 1000 times / m are particularly excellent in the above-described cleaning evaluation, evaluation of hair fallability and openness, and excellent cleaning effect even when used as a toothbrush. Also, the waist and waist were firm, flexible and easy to use. Moreover, even if it was used 3 times a day for 2 weeks, the scale did not accumulate black.
Those with 200 turns / m have a tendency to be thin and unsatisfactory compared to those with 500 turns / m. Those with 2000 turns / m have a tendency to be 500 turns / m and 1000 turns / m. Although it was thick and inferior in usability, good cleanability was obtained. Moreover, even if it was used three times a day for two weeks, the scale did not accumulate black.
When the number of windings was 150 turns / m, the number of windings was small, the projection angle was loose, the scraping effect at the sheath yarn was not sufficient, and the cleaning effect was inferior. Also, when the number of windings is 2200 times / m, the sheath thread is not wound in a uniform spiral shape, and the cleaning effect is insufficient, and when used three times a day for two weeks, scales etc. are slightly blackened. As a result. These results are shown in the following table. The remaining amount of toothpaste in the table indicates the remaining amount of toothpaste after three reciprocating strokes in the cleaning evaluation, and the smaller the amount, the higher the cleaning effect.

Example 5
Core-sheath type composite fiber monofilament with fineness of core yarn X changed to 500 dtex (hot water shrinkage: 7.6%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 214 μm, core-sheath ratio 3: 1 ), A sheath-sheath composite fiber monofilament in which the fineness of the sheath yarn Y is changed to 11 dtex and the core-sheath ratio is 1: 1 (hot water shrinkage: 7%, dry heat shrinkage at 180 ° C .: 15%, fiber diameter 32 μm) Except for the above, covering was performed in the same manner as in Example 1 and heat setting was performed to obtain a brush hair material. Next, as in Example 1, the obtained bristle material was towed, cut, processed by alkali weight loss, flocked, and a toothbrush was obtained.

Example 6
Core-sheath type composite fiber monofilament with fineness of core yarn X changed to 300 dtex (hot water shrinkage: 7.6%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 170 μm, core-sheath ratio 3: 1 ) And a sheath-sheath composite fiber monofilament in which the fineness of the sheath yarn Y is changed to 56 dtex and the core-sheath ratio is 1: 1 (hot water shrinkage: 10%, dry heat shrinkage at 180 ° C .: 18%, fiber diameter 72 μm) Except that the core-sheath ratio (volume ratio) was 1: 1), covering and heat setting were performed in the same manner as in Example 1 to obtain a brush hair material. Next, as in Example 1, the obtained bristle material was towed, cut, processed by alkali weight loss, flocked, and a toothbrush was obtained.

Example 7
Core-sheath type composite fiber monofilament with fineness of core yarn X changed to 500 dtex (hot water shrinkage: 7.6%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 214 μm, core-sheath ratio 3: 1 ) And the fineness of the sheath yarn Y was changed to 22 dtex / 4f, and the core-sheath composite fiber multifilament (hot water shrinkage: 8%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 45 μm, core-sheath ratio) Except that (volume ratio) was 2: 1), covering was performed in the same manner as in Example 1, and heat setting was performed to obtain a bristle material for a brush. Next, as in Example 1, the obtained bristle material was towed, cut, processed by alkali weight loss, flocked, and a toothbrush was obtained.

Example 8
Core-sheath type composite fiber monofilament with fineness of core yarn X changed to 200 dtex (hot water shrinkage: 7.6%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 135 μm, core-sheath ratio 3: 1 ) And a sheath-sheath composite fiber monofilament in which the fineness of the sheath yarn Y is changed to 56 dtex and the core-sheath ratio is 1: 1 (hot water shrinkage: 9%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 45 μm) Except for the above, covering was performed in the same manner as in Example 1 and heat setting was performed to obtain a brush hair material. Next, as in Example 1, the obtained bristle material was towed, cut, processed by alkali weight loss, flocked, and a toothbrush was obtained.

  Next, about the toothbrush obtained in Examples 5-8, the said cleaning evaluation and hair fallability were implemented. The results are shown below together with the results of Example 1 for the major axis / minor axis (the value obtained by dividing the length of the major axis by the length of the minor axis). The remaining amount of toothpaste in the table indicates the remaining amount of toothpaste after three reciprocating strokes in the cleaning evaluation, and the smaller the amount, the higher the cleaning effect.

  From the above, when the ratio of the major axis / minor axis was 1.06, 1.17, 1.28, almost no toothpaste remained, and the cleaning effect was particularly good. In the case of 1.03, 1.36, it is better than Comparative Examples 1-3, but inferior to those of Examples 1, 5, 6 in terms of cleaning effect. In addition, the long axis / short axis ratios of 1.06, 1.17, and 1.28 were particularly difficult to fall down.

Example 9
Core-sheath type composite fiber monofilament with fineness of core yarn X changed to 100 dtex (hot water shrinkage: 7.6%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 83 μm, core-sheath ratio 2: 1 ), A sheath-sheath composite fiber monofilament in which the fineness of the sheath yarn Y is changed to 11 dtex and the core-sheath ratio is 1: 1 (hot water shrinkage: 7%, dry heat shrinkage at 180 ° C .: 15%, fiber diameter 32 μm) Except for the above, covering and heat setting were performed in the same manner as in Example 1 to obtain a brush hair material having a major axis / minor axis of 1.24. Next, the obtained hair material was tow-processed, cut, and planted on the base material of the cosmetic brush. The obtained brush had a firm waist and had good powder content and good powder separation.

Example 10
Core-sheath type composite fiber monofilament with fineness of core yarn X changed to 1000 dtex (hot water shrinkage: 7.6%, dry heat shrinkage at 180 ° C .: 16%, fiber diameter 277 μm, core-sheath ratio 2: 1 ), A sheath-sheath composite fiber monofilament in which the fineness of the sheath yarn Y is changed to 56 dtex and the core-sheath ratio is 1: 1 (hot water shrinkage: 7%, dry heat shrinkage at 180 ° C .: 15%, fiber diameter 72 μm) Except for the above, covering and heat setting were performed in the same manner as in Example 1 to obtain a brush hair material having a major axis / minor axis of 1.16. Subsequently, when the said cleaning evaluation was implemented about the obtained bristle material, the toothpaste was hardly left and it was excellent in the cleaning effect. In addition, the waist was firm and the bending recovery was excellent. It was suitable for use in industrial cleaning applications.

Example 11
As core yarn X, the core component is polybutylene terephthalate (softening point: 220 ° C., melting point 220-230 ° C.), and the sheath component is copolymerized polyethylene terephthalate copolymerized with 25 mol of isophthalic acid (softening point: 70 ° C., melting point 160 ° C. ) And polybutylene terephthalate in a 2: 1 chip mix, 84 dtex / 28f core-sheath composite fiber monofilament (hot water shrinkage: 7.3%, 180 ° C. dry heat shrinkage: 15% A fiber diameter of 96 μm and a core-sheath ratio of 3: 1) were prepared.
As the sheath yarn Y, the core component is polyethylene terephthalate (softening point: 238 to 240 ° C., melting point: 255 to 260 ° C.), and the sheath component is copolymerized polyethylene terephthalate copolymerized with 25 mol of isophthalic acid (softening point: 70 ° C., melting point) 160 d) 13 dtex core-sheath type composite fiber monofilament (fiber diameter 38 μm, core-sheath ratio (volume ratio is 2: 1)) was prepared.
Covering was performed by winding the sheath yarn Y around the core yarn X in a spiral shape with a gap so as to have a winding number of 1000 turns / m under the following conditions.
The resulting covering yarn was wound at a winding speed of 40 m / min (heating time to the yarn of 1 second) while performing heat setting at a set temperature of 220 ° C. to obtain a brush hair material. The physical properties of the obtained hair material are shown below. Moreover, the micrograph of the fiber cross section of the obtained hair material is shown in FIG. 7, and the micrograph of the fiber viewed from the side is shown in FIG. The 15% sheath yarn was in contact with the outer periphery of the core yarn.
<Physical properties of hair material>
Fineness: 100 dtex
Pitch: 1mm
Fineness ratio: 10: 1.2
Breaking strength: 3.7 cN / dtex
Elongation at break: 25%
Long axis: 132μm
Short axis: 110 μm
Long axis / short axis: 1.2 / 1
Hot water shrinkage: 2%
The obtained hair material was tow-processed and cut. Next, the tip is immersed in an alkaline solution at a temperature of 60 ° C. and a concentration of 30%, pulled up step by step, one side is reduced to a taper shape, and the head portion of the brush brush base material for containing the powder is implanted, A brush was obtained. This brush was excellent in strength and rigidity and had a good cleaning effect. In addition, when used with a brush, the powder content was good and the powder separation was good.

[Comparative Example 6]
A bristle material for brush and a brush were obtained in the same manner as in Example 11 except that the core yarn X and the sheath yarn Y of Example 11 were subjected to 300 times twisting instead of covering. The cleaning effect was inferior to that of Example 11, including powder, and poor powder separation. In addition, it was 5.6 g in Example 11 when the weight of the powder obtained by scooping out the brushes obtained in Example 11 and Comparative Example 6 in the same manner from the dish containing 50 g of white powder was measured. In Comparative Example 6, it was 3.2 g. From this, it can be seen that the powder of Example 11 contains better powder.

Example 12
As core yarn X, the core component is polybutylene terephthalate (softening point: 220 ° C., melting point 220-230 ° C.), and the sheath component is copolymerized polyethylene terephthalate copolymerized with 25 mol of isophthalic acid (softening point: 70 ° C., melting point 160 ° C. ) And polybutylene terephthalate in a ratio of 2: 1 by weight with a chip mixture of 280 tex core-sheath composite fiber monofilament (hot water shrinkage: 7.2%, dry heat shrinkage at 180 ° C .: 16 %, Fiber diameter 176 μm, core-sheath ratio 3: 1).
As the sheath yarn Y, the core component and the core-sheath composite fiber monofilament having the same sheath component as that of the core yarn X (hot-shrinkage rate: 7.2%, dry heat shrinkage at 180 ° C .: 28 dtex, fiber diameter 54 μm, core A sheath ratio (volume ratio of 2: 1) was prepared.
Covering was performed by winding the sheath yarn Y around the core yarn X in a spiral shape with a gap so that the number of windings was 500 turns / m under the following conditions.
The obtained covering yarn was wound at a winding speed of 60 m / min (heating time to the yarn of 1 second) while performing heat setting at a set temperature of 220 ° C. to obtain a brush hair material. The physical properties of the obtained hair material are shown below. 56% sheath yarn was in contact with the outer periphery of the core yarn.
<Physical properties of hair material>
Fineness: 321 dtex
Pitch: 1.7mm
Fineness ratio: 10: 1
Breaking strength: 5.3 cN / dtex
Elongation at break: 39%
Young's modulus: 3452 N / mm ²
Long axis: 205μm
Short axis: 179 μm
Long axis / short axis: 1.15 / 1.0
Hot water shrinkage: 2.4%
The obtained hair material was tow-processed and cut into 30 mm. The obtained bristle material had a bending hardness of 0.2043 cN · cm ² / cm / yarn, and a bending recovery property of 0.0401 cN · m / m / yarn. It can be seen that this is superior in strength and rigidity as compared with that in Example 1.

The brush bristle material of the present invention, when used in a toothbrush, can be suitably used because it has a waist, is flexible and durable, has no cleaning object collected on the brush, and has an excellent cleaning effect. . When used for a makeup brush or the like, the powder can be contained well or separated.
And with brushes that contain chemicals and water, etc., they can be used to remove dirt with the protrusions on the side of the bristle material for brushes and obtain an excellent cleaning effect. It is easy to use without the fact that does not come into the groove.
Further, compared to a brush hair material that is monofilament extruded, twisted and twisted, it has a lower back and is less likely to fall down or open. Also, by adjusting the pitch of the spiral protrusion integrated into the core yarn and the ratio of the long axis to the short axis, it is suitable for a wide range of fields such as brush pens, nail polish brushes, equipment cleaning brushes, pet brushes, duster brushes, etc. Available to:

Claims (8)

A bristle material for a brush comprising a covering yarn in which a sheath yarn is wound around the core yarn, wherein the core yarn and the sheath yarn are composed of a core-sheath type composite fiber in which a fusion component is exposed on the fiber surface. The yarn is a bristle material for a brush in which the respective fusion components are fused and fixed by surface contact, and the winding number of the sheath yarn is 200 to 2000 turns / m. The brush hair material according to claim 1, wherein the fusion component of the core yarn and the sheath yarn is the same component. The brush hair material according to claim 1 or 2, wherein a value obtained by dividing the length of the major axis of the fiber cross section of the brush hair material by the length of the minor axis is 1.05 to 1.3. The core yarn is composed of a core-sheath type composite fiber monofilament in which the core component is polybutylene terephthalate and the sheath component is a polyethylene terephthalate copolymerized with the third component. The sheath yarn is composed of polyethylene terephthalate and the sheath component is the third component. The bristle material for brushes according to any one of claims 1 to 3, comprising a core-sheath-type composite fiber monofilament which is a copolymerized polyethylene terephthalate copolymerized with the above. It is a bristle material for toothbrushes, The bristle material for brushes of any one of Claims 1-4. Using a core-sheath type composite fiber having a melting point of the sheath component lower than that of the core component for the core yarn and the sheath yarn, covering is performed so that the winding number is 200 to 2000 turns / m, and the melting point of the sheath component of the core yarn and the sheath yarn A method for producing a bristle material for a brush, which is heat-set at a temperature higher than the melting point of the core component of the core yarn and sheath yarn, and the sheath component of the core yarn and sheath yarn is fused and fixed by surface contact. The manufacturing method of the bristle material for brushes which gives a tow process to the bristle material for brushes obtained in Claim 6, and cuts. A method for producing a bristle material for a brush, wherein the bristle material for a brush obtained in claim 7 is further melted with a component of the hair tip to form a taper shape.

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