JP2005245719A - Brush - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a brush favorably sticking a bristle-filling base to a coating material. <P>SOLUTION: This brush is so formed that bristle bundles 3 are inserted in bristle-filling holes 21 of the bristle-filling base 20 having the plurality of bristle-filling holes 21 and a melt lump 30 is formed in one end of the bristle bundle 3 projecting from the bristle-filling hole 21. The melt lump 30 is covered with the coating material 4. An inner area formed by connecting the bristle-filling holes 21 disposed in the outermost circumference out of the bristle-filling holes 21 (a bristle-filling area S0) is 100-170 mm<SP>2</SP>. The ratio S1/S0 of a contact area S1 of the coating material of the bristle-filling base 2 to the bristle-filling area S0 is 0.5-0.9. An erecting wall part 200 is provided in the outer edge of the bristle-filling base. The erecting wall part 200 has a contact face B1 approximately perpendicular to the bristle-filling base 20 and preferably, its ratio B1/S1 to the contact area S1 with the coating material 4 is 0.1-0.6. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a brush, particularly a brush suitable for a toothbrush.

  A toothbrush in which a bristle bundle is inserted into a flocking base having a flocking hole, a molten lump is formed at one end of the bristles protruding from the flocking hole, and the molten lump is covered with a coating material has been proposed. (For example, see Patent Documents 1 and 2 below).

  These toothbrushes are required to firmly bond the covering material and the flocked base. However, in these techniques, as shown in FIG. 11 (a), when forming the molten lump 30, the constituents of the hair bundle 3 are easily melted and spread on the upper surface of the flocked base 20. There was a problem that the area of adhesion with a coating material (not shown) was narrowed and sufficient adhesion strength could not be obtained. In particular, when the area of the flocked base is narrowed or the molten lump is melted by the contact-type heat melting means 17, the molten lump 30 may protrude from the flocked base as shown in FIG. 11 (b). there were. In a toothbrush, a material having a solubility parameter (SP value) difference of 1 or more may be used in combination with a covering material and a bristle bundle. In such a case, the molten mass portion and the covering material may be used. Therefore, if the bonding area between the flocked base and the covering material cannot be secured, sufficient adhesion between them may not be obtained.

JP-A-9-182632 US Pat. No. 5,458,400

  This invention is made | formed in view of the above-mentioned problem, and it aims at providing the brush with favorable adhesiveness of the flocked base and a coating | covering material.

  As a result of earnestly examining the brush by the back surface covering having the standing wall portion on the outer edge portion of the flocked base portion, the present inventors have found that the upper surface portion of the flocked base portion and the bonding area between the standing wall portion and the covering material are in a specific range. It was found that the adhesiveness between the flocked base and the covering material was excellently obtained.

  The present invention has been made on the basis of the above knowledge, and a hair bundle is inserted into the flocked hole of the flocked base having a plurality of flocked holes, and a molten lump is formed at one end of the follicle protruding from the flocked hole. Is formed, and the melted lump is covered with a coating material, and the inner flocking area (S0) in which the outer edges of the flocking holes arranged on the outermost periphery of the flocking hole are connected by tangents is 100 to 170. It is a square millimeter, and provides the brush whose ratio (S1 / S0) of the flocked area (S0) and the adhesion area (S1) of the flocked base to the covering material is 0.5 to 0.9. is there.

  According to the present invention, a brush having good adhesion between the flocked base and the covering material can be obtained.

Hereinafter, the present invention will be described based on preferred embodiments thereof.
FIG. 1 shows an embodiment in which the brush of the present invention is applied to a toothbrush. In FIG. 1, the code | symbol 1 has shown the toothbrush.

  As shown in FIG. 1A, the toothbrush 1 of the present embodiment has a flocked base 20 at the tip of the toothbrush body 2. As shown in FIG. 1B, a plurality of flocked holes 21 are provided in the flocked base portion 20, and the hair bundles 3 are inserted into the flocked holes 21, respectively. A molten mass 30 is formed at one end of the bristle bundle 3 protruding from the flock hole 21. The flocked base 20 is adhered to the covering material 4 at the bonding surfaces 201, 203, and 204, and the molten mass 30 is covered with the covering material 4.

  As shown in FIGS. 1B, 2, and 3, a standing wall 200 is provided on the outer edge of the flocked base 20 in the toothbrush body. An adhesive surface (first adhesive surface) 203 and an adhesive surface (second adhesive surface) 204 that increase the adhesive area between the covering material 4 and the flocked base 20 are formed on the inner peripheral surface portion and the upper surface portion of the standing wall portion 200. It is provided and increases the adhesive strength between the flocked base and the covering material 4 and prevents the molten lump 30 from flowing out of the flocked base 20 when the molten lump 30 is formed.

  In order to secure strong adhesion between the flocked base 20 and the covering material 4, the planting surfaces 203 and 204 with the covering material 4 are provided on the inner peripheral surface portion and the upper surface portion of the standing wall portion 200 in this way, 4 is preferably increased. In this case, the bonding surface 203 is preferably provided substantially perpendicular to the flocked base 20, but may be inclined. Moreover, although it is preferable to provide the adhesive surface 204 substantially horizontally with respect to the flocked base 20, it may be inclined.

The brush 1 has an inner area (hereinafter referred to as a flocked area (S0), see FIG. 3A) in which the outer edges of the flocked holes arranged on the outermost circumference are connected by a tangent line is 100 to 170 square millimeters, The ratio (S1 / S0) of the flocked area S0 and the bonding area (S1) between the flocked base and the covering material suppresses the size and thickness of the flocked base from the viewpoint of improving the adhesion between the flocked base 20 and the covering material. In consideration of not impairing the operability as a brush, it is 0.5 to 0.9, preferably 0.5 to 0.8.
Here, the bonding area (S1) of the flocked base with the covering material is as shown in FIG. 3 (b) when the top surface 201 of the flocked base 20 after forming the molten mass 30 is viewed in plan view. The total area obtained by adding together the adhesion area (A1) of the adhesive surface, the adhesion area (A2) of the adhesion surface on the upper surface portion of the standing wall portion 200, and the adhesion area (B1) on the inner peripheral surface portion of the standing wall portion 203.

  In order to manufacture a high-quality toothbrush in which the bristles are densely implanted in the head portion, it is necessary to secure a wide bonding area outside the flocked area (S0). For such a toothbrush, in order to increase the bonding area as much as possible without increasing the size of the head part, it is one of effective means to provide the standing wall part 200 as in the present embodiment. Further, in order to ensure bending strength in a plurality of directions, it is desirable to provide a plurality of adhesive surfaces as in this embodiment.

  In order to secure the adhesion between the flocked base and the covering material, to suppress the size of the flocked base, and to improve the operability and usability of the toothbrush, the adhesive area (B1) of the inner peripheral surface portion of the standing wall portion The ratio (B1 / S1) of the adhesion area (S1) between the coating material and the covering material is preferably 0.1 to 0.6, more preferably 0.1 to 0.5.

  Each total area and each adhesion area described above can be obtained, for example, by image analysis of the upper surface portion of the flocked base after the covering material is peeled off.

For example, as shown in FIGS. 4A and 4B, the peeling strength of the covering material 4 is obtained by cutting the flocked base portion of the toothbrush at a portion adjacent to the flock hole on the most handle side of the covering material 4 as shown in FIG. As shown in Fig. 4, the jig X is inserted into the bonding boundary surface between the flocked base portion and the covering material 4 on the cut surface, and the inserted jig X is lifted to the upper portion to determine the strength (hereinafter, this method is referred to as measurement method 1). .) At this time, the pulling-up speed is 50 mm / min, and for example, a push-pull gauge is used as a measuring instrument.
As another measurement method, for example, as shown in FIG. 5, the peel strength of the covering material 4 is such that the toothbrush head is supported by the support S with a span of 30 mm around the flock hole adjacent portion on the most handle side. The part is pressed downward from the flocked side with the jig Y, and is determined by the strength with which the covering material is peeled off (hereinafter, this method will be referred to as measurement method 2). At this time, the pressing jig Y has a width of 2.5 mm and a downward pressing speed of 50 mm / min. For example, a push-pull gauge is used as a measuring instrument.
In consideration of the force for pressing the flocked portion on the teeth at the time of tooth brushing and the fact that the coating material does not peel off from the flocked base during use or washing, in the case of the toothbrush 1, the peel strength according to the measurement method 1 is preferably 15 N or more. Considering that the covering material 4 does not peel due to bending stress applied to the head during brushing, the peel strength according to the measurement method 2 is preferably 60 N or more.

  A preferable thickness t1 (see FIG. 1) of the flocked portion (toothbrush head portion) of the toothbrush 1 is 5.5 mm or less in consideration of good operability in the oral cavity. (The reachability of the hair to the back teeth) is further improved, but considering the fact that the strength as a toothbrush is secured and the hair bundle 3 is stably held in the hair transplant base 20 is also taken into consideration. The range of t1 is 3-5 mm.

  As the thickness t2 (see FIG. 2) of the bottom surface portion of the flocked base 20 increases, the moldability becomes easier and the bending strength increases. However, considering the operability and practicality of the toothbrush 1, t2 is preferably 1 to 4 mm. 1 to 2 mm is more preferable.

  The height h of the standing wall 200 is preferably 0.3 to 3 mm in consideration of the relationship with the thickness t2, the coating thickness of the molten lump 30, and the operability of the toothbrush 1 is also important. 0.4-2 mm is more preferable.

  It is preferable that the opening peripheral part 210 on the upper side of the flocking hole 21 is provided with a tapered portion that expands upward. The taper angle α of this portion is preferably 20 to 120 °, more preferably 30 to 90 °. When the angle α is set within a preferable range, it is easier to insert the hair bundle 3 into the flock hole 21.

  The spacing d1 between the flock holes 21 is set so as not to hinder the insertion of the hair bundle 3 into the flock holes 21, to prevent the strength of the flock base 20, and when filling the flock base 20 with resin. In consideration of securing a resin flow path and smooth filling of the resin, it is preferably at least 0.3 mm or more, more preferably 0.5 mm or more.

  The cross-sectional shape of the flock hole 21 can be appropriately selected from a substantially circular shape, a substantially oval shape, a substantially elliptical shape, various triangular shapes, various rectangular shapes, and the like. In addition, the flock holes 21 can be provided with different sizes and shapes at the tip, center and both sides of the flocked base 20.

  For the toothbrush body 2, a conventional thermoplastic resin conventionally used for a toothbrush body can be used without particular limitation. Examples of the thermoplastic resin include polyolefins such as polypropylene, polyesters such as polycarbonate, polymethyl methacrylate, and polyethylene terephthalate, acrylonitrile-styrene copolymers, acrylonitrile-butadiene-styrene copolymers, and the like. These thermoplastic resins can be used alone or in a suitable manner.

  The thickness, length, or cross-sectional shape of each of the hairs constituting the hair bundle 3 can be appropriately selected according to the function of the toothbrush 1 and the like. Moreover, the said bristles can use the normal material conventionally used for the bristles of a toothbrush without a restriction | limiting especially. Examples of the material for the hair constituting the hair bundle 3 include polyamide such as nylon and polyester such as polybutylene terephthalate.

  In particular, the toothbrush body 2 and the covering material 4 have polypropylene resin [solubility parameter (SP value) = 8.0] or polyethylene terephthalate [solubility parameter (SP value) = 10.7], and the hair bundle 3 has nylon [solubility]. In the case of combining the material constituting the flock base 20 and the material constituting the hair bundle 3 with a difference in solubility parameter of 1 or more, as in the case of using the parameter (SP value) = 13.6] The effect of the present invention is sufficiently exerted in the case of combining materials considered to have poor adhesion.

  As shown in FIG.1 (b), it is preferable that the molten lump 30 has the end surface part 300 shape | molded so that the circumference | surroundings may stand up from the said hair transplant base part 20. FIG. That is, the end surface portion 300 is preferably shaped so as to have a gap between the standing wall portion 200 and the molten mass 30. The shape can be confirmed by, for example, magnifying observation of the cross section of the toothbrush 1.

The toothbrush 1 has a gap d2 (see FIG. 1B) between the standing wall 200 and the molten mass 30 adjacent to the standing wall 200 to secure a bonding area and improve the bonding strength. In consideration of suppressing the size of the head portion and improving the operability and usability as a toothbrush, 0.1 to 2.0 mm is preferable.
Here, the dimension d <b> 2 refers to the dimension of the gap in the closest part between the inner surface of the standing wall 200 and the molten mass 30 adjacent to the standing wall 200.

  The covering material 4 is not particularly limited as long as it is a material that can be bonded to the flocked base 20. The covering material 4 can be the same material as the flocked base 20 or a different material.

  In the toothbrush 1 of the present embodiment, the bonding area between the flocked base 20 and the covering material 4 is sufficiently secured even after the molten lump 30 is formed. It does not protrude from the base. Therefore, the flocked base 20 and the covering material 4 are bonded well.

  Moreover, in the toothbrush 1 of this invention, it is preferable to have a wide adhesion | attachment area | region near the filling gate of resin at the time of filling the coating | covering material (resin) 4, By doing in this way, the flocked base 20 and coating | covering material The adhesion of 4 is made even better.

Next, the manufacturing method of the toothbrush 1 of this embodiment is demonstrated.
First, the toothbrush body 2 having the flocked base 20 at the tip as shown in FIG. For molding the toothbrush body 2, a mold 10 having a cavity 11 corresponding to the shape of the toothbrush body 2 and a resin injection path 12 leading to the cavity 11 is used as shown in FIG. Then, the molding die 10 is set in an injection molding machine (not shown), and a thermoplastic resin (not shown) is injected in a molten state from the resin injection path 12 into the cavity 11 with a predetermined injection molding pressure. Demold after cooling and solidification.

  Next, as shown in FIG. 7, the hair bundle 3 is inserted into the flock hole 21. Although there is no restriction | limiting in particular in the insertion method of the hair | bristle bundle 3 to the flock hole 21, The method of bundling a predetermined number of cut hairs and inserting is preferable. When inserting the bristle bundle 3, it is preferable to use the bristle bundle holding jig 13 having the insertion hole 130 at a position corresponding to the flock hole 21. The protruding length of the bristle bundle 3 from the upper surface of the flocked base 20 is set so that a melted lump having a desired size can be obtained. At this time, if the protruding length of the bristle bundle 3 is short, a melted lump of a desired size cannot be formed, and when the melted lump is covered with a coating material as described later, the flock holes 21 and the melted lump 21 are melted. It is important to secure the required amount of protruding length of the bristle bundle 3 because the covering resin may leak from between the lumps and the desired bristle bundle pullout strength may not be ensured.

  Next, as shown in FIG. 8 and FIG. 9, in order to regulate the spread of the molten mass and the adhesion of the splashes generated when melting the hair bundle 3 to the flocked base 20 when forming the molten mass. The mask plate (restricting means) 14 is arranged on the flocked base 20. Here, the splash generated when the hair bundle 3 is melted is a vaporized component of the hair generated when the hair bundle is melted by the melting means (when the component is sublimated or heated). Including components that have been decomposed and vaporized). In particular, as described later, when a laser beam is used as the melting means, the splash is likely to occur. Therefore, by using the mask plate 14, the flocked base 20 (including the bonding surface 203 of the standing wall 200) is used. Is prevented from adhering to the portion covered with the mask plate 14. The mask plate 14 may be arranged on the hair transplant base 20 before the hair bundle 3 is inserted into the hair transplant hole 21.

  The mask plate 14 has a peripheral wall portion (wall portion) 140 that covers the bonding surface 203 of the standing wall portion 200. Moreover, the mask plate 14 can adopt a form in which all or a part of the molten masses are not connected and has a partition wall portion (wall portion) 141 that secures the flocked base bonding surface. And with these partition wall parts 141, a clearance gap can be provided between the molten lump 30 so that a part of molten lump 30 may not be connected. The form, number, and position of the partition wall are appropriately set according to the arrangement of the hair bundles and the molten mass to be connected.

  By using the mask plate 14, when the molten mass 30 is formed, the wall portion 140 prevents the molten mass 30 from spreading to the standing wall portion 200 side and adhesion of the droplets to the flocked base portion 20. For this reason, after the mask plate 14 is retracted, an adhesion region with the covering material 4 is secured in a desired area and in a dispersed state on the flocked base 20. Further, since the flocked base 20 is pressed by the mask plate 14, it is possible to prevent warpage or deformation of the flocked base 20 when the molten mass 30 is formed.

  The material of the mask plate 14 is not particularly limited as long as it is a material that can withstand thermal deformation during the formation of the molten lump, but it is difficult to adhere to the molten lump 30 and the droplets generated during the formation of the molten lump Those that are difficult to adhere are preferred. From such a viewpoint, examples of the material of the mask plate 14 include metals such as aluminum alloys and stainless steel, polymer materials such as fluororesin, ceramics, and the like. The surface of the mask plate 14 is preferably coated with a fluororesin or the like from the viewpoint of suppressing resin adhesion.

  It is preferable to arrange an air flow supply means (not shown) on the mask plate 14. And while blowing the stream of inert gas from the said air flow supply means, while melting the molten lump 30 and the flocked base 20 during the formation of the molten lump 30, the molten lump 30 is formed in an inert gas atmosphere or a low oxygen concentration atmosphere. It is preferable to form. Note that the blowing of the air flow can also be performed immediately after the formation of the molten mass 30. According to the air flow supplying means, the hair can be prevented from being burnt and discolored by blowing the air flow during the formation of the molten mass 30 and the molten resin of the hair can be prevented from adhering to the mask plate 14. Can do. Examples of the inert gas to be blown include nitrogen and argon.

  Next, as shown in FIG. 9, one end portion of the bristle bundle 3 is melted by a non-contact melting means to form a molten mass 30, and the molten mass 30 and the opening peripheral portion 210 of the flocked hole 21 are fixed. Let At this time, if the molten mass 30 is formed without pressing, the hair bundle 3 is not stressed, the hair is not twisted or disturbed, and a high-quality flocked state can be maintained. The melted portion is pressed by a pressing means (not shown) within a range that does not affect the bonding area between the flocked base 20 and the covering material 4 and the orientation of the hair bundle 3, and the molten mass 30 and the opening peripheral edge 210 are in close contact with each other. The sex can be further enhanced.

  In the present embodiment, a method of irradiating a laser beam from a predetermined laser oscillator is adopted as the means for forming the molten mass 30 by the non-contact type melting means. This method is preferable for forming the individual molten masses 30 in a required shape with high accuracy and efficiency.

  In the present embodiment, in the optical path of the laser light from the laser oscillator to the imaging lens, the irradiation pattern (scanning pattern) registered in advance in the storage unit according to the cross-sectional shape of the flock hole 21 and one end of each hair bundle 3. ), The controller servo-controls the angle of the reflecting mirror disposed in the optical path and controls the position of the focus lens, so that the laser beam emitted from the imaging lens can be accurately applied to each hair bundle 3. Scanning irradiation is performed on one end of each.

The thickness (beam diameter) of the laser beam is appropriately set according to the cross-sectional shape, number, position, and the like of the flock holes 21 and the hair bundle 3.
In this embodiment, the beam diameter is preferably 0.1 to 4 mm in order to scan and irradiate the opening peripheral edge 210 of each flocked hole 21 and one end of each hair bundle 3. In the case where the energy of the laser beam is increased and the melted deformation of the opening peripheral portion 210 of each flocked hole 21 is formed and the molten lump 30 is formed on each hair bundle 3 in a fine scanning form, 0.1 to 1 mm. It is more preferable that

  About the irradiation pattern of the said laser beam, the length of the hair of each said hair bundle 3, the cross-sectional dimension of each hair bundle 3, the flocking position in the flocking base 20 of each hair bundle 3, the hair bundle 3 of each hair bundle 3 Optimal parameters (irradiation spot diameter) based on the angle to the flocked base 20, the hair density of each hair bundle, the type (thickness, color (light absorption rate)) of the hair bundle, the tip shape, etc. By setting the irradiation heat amount, irradiation time, scanning speed, scanning pitch, etc.) and performing scanning irradiation corresponding to the individual hair bundles 3, a good molten mass 30 can be formed.

The scanning pitch of the laser beam is preferably 0.05 to 2 mm, although it depends on the spot diameter, scanning speed, or output of the laser beam.
The scanning speed of the laser beam is 60 to 800 mm / second (output 12 to 50 W) from the viewpoint of securing the heat capacity and the melting time necessary for the melting and deformation of the opening peripheral portion 210 and the opening inner peripheral surface portion 211 and the formation of the molten lump 30. It is preferable that

  The irradiation pulse of the laser beam is preferably 1 to 10 kHz from the viewpoint that a high output is obtained and the pulse can be achieved. The output of the laser beam is preferably 10 to 100 W from the viewpoint of compatibility with the laser beam scanning mode and simple equipment.

The source of the laser beam is not particularly limited as long as it can generate an output capable of melting one end of the hair bundle 3 for irradiation. Examples of the laser beam generation source include CO ₂ , Ar, TEA CO ₂ , excimer, He-cd, and YAG. Among these, CO ₂ is preferable in terms of efficiently melting the plastic material.

  In the present embodiment, the molten lump 30 is formed by changing the irradiation parameter at one end of each hair bundle 3 with a small-diameter laser beam. For this reason, for example, when the protruding lengths of the respective hair bundles 3 are different, parameters such as the irradiation time and the scanning pitch are changed for a form with a large amount of protrusion or a form with a large cross-sectional area for the hair bundle. Then, a larger amount of heat is applied during the scanning irradiation, and the molten mass 30 is appropriately formed. In a mode in which the protruding amount of the hair bundle 3 is small and the cross-sectional area of the hair bundle 3 is small, the parameter is changed in the opposite manner to reduce the amount of heat applied during scanning irradiation. In particular, in the form of one end of one hair bundle 3, when the protruding amount of each hair is changed (for example, the cross section of one end of one hair bundle 3 is slanted or uneven In this case, it is possible to form a molten mass 30 having a uniform height by irradiating the high portion once with scanning, and further irradiating the entire one end again with scanning irradiation. .

  The laser beam scanning irradiation can concentrate heat on the high part of the hair bundle 3 (the part that you want to melt a lot) and give the amount of heat, narrow the scanning pitch or change the scanning speed partly. In addition, since a large amount of heat of fusion can be applied by concentrating on the necessary part, it is possible to form a molten lump in an appropriate form utilizing the characteristics.

  When a laser beam is used as the non-contact melting means, the stress on the hair used when forming the molten mass 30 can be kept low. In particular, in the case of a laser beam, it is possible to apply heat only to a portion to be melted when forming the molten mass 30 and not to apply heat to a portion that does not need to be heated. It is possible to manufacture a toothbrush in which the deformation and warpage of the base 20 are extremely small.

  In the present embodiment, the melt lump 30 can be formed by the scanning laser method for each individual hair bundle 3 and cooled at any time with an air flow, so that the melt lump 30 is contracted individually even when the melt lumps 30 are connected. Is called. For this reason, the shift | offset | difference of the flocking angle of the hair | bristle bundle 3 can be prevented.

  Next, as shown in FIG. 10, the solidified molten mass 30 is coated with the coating material 4. The covering of the molten mass 30 is performed by attaching the brush body 2 to which the bristle bundle 3 is fixed to the injection molding device 15 together with the bristle bundle holding jig 13, and filling the flocking base 20 with the resin for the covering material 4, Allow to solidify.

  At this time, the filling gate position of the resin as the covering material is preferably provided in the covering portion where stress is concentrated during brushing. In the present embodiment, the gate position is provided on the handle side portion of the head portion of the brush body 2. As a result, the flocked base 20 and the covering material 4 can be well bonded to the stress concentration portion at a high temperature and high pressure directly under the gate during resin filling.

  After covering the molten mass 30 with the covering material 4, the bristle bundle holding jig 13 is removed from the injection molding apparatus 15, and the toothbrush 1 is removed from the bristle bundle holding jig 13 to complete its manufacture.

  The present invention is not limited to the above-described embodiment, and can be changed as appropriate without departing from the spirit of the present invention.

  In the present invention, as in the above-described embodiment, it is preferable to provide a tapered portion at the opening peripheral portion of the flocking hole in the flocking base, but it is not necessary to provide a tapered portion at the opening peripheral portion. Good.

  Further, in the present invention, as in the above-described embodiment, some of the molten lumps may not be connected, but all of the molten lumps may not be connected, and all of the molten lumps may be connected. May be.

  Further, the melting of one end of the hair bundle by the non-contact type melting means is preferably performed by moving the laser beam and scanning as in the above embodiment. Irradiation may be performed by moving the base.

  Further, the non-contact type melting means may be one equipped with a light source such as a halogen lamp, and the same effect as a laser beam can be obtained by condensing the light emitted from the light source. it can. In this case, similarly to the above, the method of fixing the condensed light source and moving the flocked base is preferable in terms of the device configuration. In addition to this, non-contact melting means provided with hot air blowing means can also be employed.

  Moreover, although it is preferable to provide an upright wall part over the perimeter of an outer edge part so that a flock hole may be surrounded to the outer edge part of a flocked base part like the said embodiment, you may provide in a part of outer edge part. .

  In addition, the mask plate (regulating means) that covers the standing wall part preferably covers the entire adhesive surface of the standing wall part, but depending on the restrictions in forming the standing wall part, flocking hole, or desired molten mass, A part of the adhesive surface may be covered.

  Moreover, although it is preferable to perform the restriction | limiting of the spreading | diffusion of the molten lump in a mask plate (regulation means) and the adhesion | attachment area | region of a flocked base to the whole flocked base (all the circumferences), It can also be done.

  Moreover, as for this invention, although it is preferable to insert the hair | bristle bundle 3 in the flock hole 21 from the back side of the flocked base 20 like the said embodiment, it can also be inserted in a flock hole from the front side of the flocked base. it can.

  In addition, as in the above-described embodiment, the present invention preferably uses hair that has been cut to a predetermined length in advance, but a hair bundle wound around a reel can also be used. In this case, the hair bundle is inserted into the flock hole from the front side of the flocked base, and one end of the protruded hair bundle is melted by non-contact melting means to form a molten lump and the molten lump and It is preferable that the hair bundle is cut to a desired length after fixing the peripheral edge of the flock hole.

  In the method for producing a brush of the present invention, as in the above-described embodiment, a molten lump is formed at one end of the bristle bundle, the molten lump is fixed to the opening peripheral edge of the flocked base, and then the molten lump is formed. It is preferable to cover and integrate with a filling resin. However, for example, a plate-like member can be bonded and integrated to the flocked base where a molten lump is formed by bonding or the like.

Hereinafter, the present invention will be described more specifically with reference to examples.
Rooted area (S0), Adhesive area (S1) and ratio (S1 / S0) of the flocked base to the covering material, Adhering area (B1) of the upright wall substantially perpendicular to the flocked base, and the covering material A toothbrush having a ratio (B1 / S1) to the adhesion area (S1) of No. 1 shown in Table 1 is prepared as in Examples 1 to 6 and Comparative Examples 1 to 3 below, and the obtained toothbrush is covered. The peel strength of the material was measured. The results are shown in Table 1.

[Example 1]
The following toothbrush body, bristle bundle and covering material were used to form a molten lump as described below, and then the molten lump was coated with the covering material as described below to obtain a desired toothbrush.
<Toothbrush body>
Material: Polypropylene Standing wall height: 1mm
Standing wall thickness: 0.7mm
Total area of flocked hole: 52.5 mm ²
Number of flock holes: 33
Thickness of the bottom of the planted base: 2 mm
Dimension from the outermost periphery of the flocked hole to the outer edge of the head: 1.0 mm
<Bristles>
Material: Nylon Thickness: 8 mil (0.203 mm)
<Coating material>
Material: Polypropylene

[Melting mass formation]
A hair bundle is inserted into the flocked hole, and one end of the protruded hair bundle is melted with a laser beam to form a molten lump, and the molten lump and the opening peripheral edge of the flocked hole are fixed.

[Coating of molten mass with coating material]
The hair bundle is fixed by filling the covering material so as to cover the molten mass.
The thickness t1 (see FIG. 1B) of the flocked portion of the obtained toothbrush was 3.5 mm.

[Example 2]
A toothbrush was produced in the same manner as in Example 1 except that the height of the standing wall portion was 0.7 mm.

Example 3
A toothbrush was produced in the same manner as in Example 1 except that the height of the standing wall portion was 0.4 mm.

Example 4
A toothbrush was produced in the same manner as in Example 1 except that the gap d2 (see FIG. 1B) between the outermost flocked hole and the outer peripheral wall was widened to make the thickness of the standing wall portion 0.4 mm.

Example 5
A toothbrush was produced in the same manner as in Example 1 except that the dimension L1 (see FIG. 1B) of the outer edge of the head was increased to 1.3 mm from the outermost periphery of the flocked hole.

Example 6
A toothbrush was produced in the same manner as in Example 1 except that the height of the standing wall portion was 1.5 mm.

[Comparative Example 1]
A toothbrush was produced in the same manner as in Example 1 except that S1 / S0 and B1 / S1 were less than the lower limit in the present invention and the height of the standing wall portion was 0.1 mm.

[Comparative Example 2]
A toothbrush was produced in the same manner as in Example 1 except that S1 / S0 exceeded the upper limit in the present invention and the dimension of the outer edge of the head was increased to 1.5 mm from the outermost periphery of the flocked hole.

[Comparative Example 3]
A toothbrush was produced in the same manner as in Example 1 except that S1 / S0 and B1 / S1 exceeded the upper limit in the present invention, and the height of the standing wall portion was set to 3.0 mm.

  As shown in Table 1, the toothbrushes of the examples in which the area ratios S1 / S0 and B1 / S1 are within the range of the present invention have a desired peel strength as compared with the toothbrushes of the comparative examples. It was confirmed that the operability was excellent. On the other hand, Comparative Example 1 has a peel strength of less than 15N according to measurement method 1 and a peel strength of less than 60N according to measurement method 2, and neither peel strength has a desired strength. Moreover, although the comparative examples 2 and 3 have desired peel strength about peel strength, it was confirmed that the operativity in an intraoral area is inferior. In addition, the operability in the oral cavity was determined based on the feeling when the teeth were actually brushed using the above toothbrushes. That is, the case where the tip of the toothbrush smoothly reached the back of the mouth and the toothbrushing operation was not particularly disturbed was marked with ◯, and the case where it was not marked with x. In the comprehensive evaluation, the case where the peel strength was not less than the desired strength and the operability in the oral cavity was found to be good, and the case where the peel strength was not good were evaluated as x. The desired strength refers to the above strength.

  The brush of the present invention is applied to a hair brush, a massage brush, a cleaning brush, and other various brushes in addition to the above-described toothbrush.

It is a figure which shows typically one Embodiment which applied the brush of this invention to the toothbrush, (a) is a side view, (b) is a sectional side view of the principal part. It is a fragmentary sectional view which shows typically the form of the front-end | tip part of the toothbrush main body in the embodiment. It is a partial top view which shows typically the adhesion area | region of the flocked base before and after formation of a molten lump, (a) is a figure before molten lump formation, (b) is a figure after molten lump formation. It is a figure which shows typically the measuring method 1 of the peeling strength of a toothbrush, (a), (b) is a figure which shows a cutting part, (c) is a figure which shows the state to measure. It is a figure which shows typically the measuring method 2 of the peeling strength of a toothbrush. It is a figure which shows typically the toothbrush main body used in the manufacturing method of the brush of the said embodiment, and its molding die, (a) Sectional drawing of a toothbrush main body, (b) is a sectional side view of a molding die. It is a principal part sectional side view which shows typically the state which inserted the hair | bristle bundle in the flock hole of the toothbrush main body of Fig.3 (a). It is a perspective view which shows typically the state which arrange | positions a control means to the flocked base. It is principal part sectional drawing which shows typically the formation process of the molten lump using a control means. It is principal part sectional drawing which shows typically the coating process of the molten lump with a coating | covering material. It is a figure which shows typically the problem in the manufacturing method of the conventional toothbrush.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Toothbrush 2 Brush main body 20 Flocking base 200 Standing wall part 201 Adhesion surface 203 1st adhesion surface 204 2nd adhesion surface 21 Flocking hole 210 Opening peripheral part 211 Opening inner peripheral surface part 3 Hair bundle 30 Molten lump 300 End surface part 4 Cover material 10 Mold 11 Cavity 12 Resin injection path 13 Hair bundle holding jig 14 Mask plate (regulating means)
140 Perimeter wall (wall)
141 Partition wall (wall)
142 Through-hole 15 Injection molding device

Claims (3)

A hair bundle is inserted into the flock hole of the flocked base having a plurality of flock holes, a molten lump is formed at one end of the bristles protruding from the flock hole, and the molten lump is covered with a coating material. A brush,
The inner flocking area (S0) connecting the outer edges of the flocking holes arranged on the outermost periphery of the flocking hole with a tangent is 100 to 170 square millimeters,
The brush whose ratio (S1 / S0) of the said flocked area (S0) and the adhesion area (S1) with the said coating | covering material of the said flocked base is 0.5-0.9. A standing wall is provided on the outer edge of the flocked base,
The standing wall portion has a first adhesive surface having an adhesive area (B1) on the inner surface portion,
The brush according to claim 1, wherein a ratio (B1 / S1) of an adhesion area (B1) of the first adhesion surface and an adhesion area (S1) of the covering material is 0.1 to 0.6. The brush of Claim 1 or 2 which has a 2nd adhesion surface in the upper surface part of the said standing wall part.

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