JPH0956475A - Brush and its manufacture - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an integral forming type brush in which the bristle strength is high, for which the generation of a burr is less, and in which the bristle standing is favorable. SOLUTION: By using a metal die wherein a movable sleeve 5 with a through hole 11 for a bristle bundle 1 is slidably provided on a metal die 10 for handle forming, is used, and the through hole 11 is closed by bringing a fused lump 2 into contact with an opening end 111 of the through hole of the movable sleeve 5. At the same time, the fused lump 2 is positioned in a cavity 13 by making the leading end surface of the movable sleeve and the internal surface of the metal die roughly meet, and a forming material is filled in the cavity. At the same time, while the forming material is flexible before being cured, the movable sleeve 5 is moved in the opposite direction from the fused lump 2 to form a gap between the leading end of the movable sleeve and the fused lump 2, and while constituting so, the forming material is filled around the base part of the bristle bundle, and the fused lump 2 and the base part 11 of the bristle bundle are held by the forming material, a brush with a high bristle strength and a favorable quality is obtained. Also, since an annular rib part is provided at the base part of the bristle bundle of the brush bristle, a bristling of a favorable bristle standing can be performed, and the thickness of the head part can be drastically reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for manufacturing a brush, such as a toothbrush or a hair brush, in which a plastic brush portion is integrated when molding a handle portion.

[0002]

2. Description of the Related Art Recently, instead of a brush in which a bunch of hair is fixed to a hair-implanting hole in a handle using a metal piece or a metal wire,
It has been proposed to integrate a brush part made of plastic at the time of molding the handle part. Traditionally, with this kind of brush,
One end of the bristled brush is melted to form a fused mass,
The thickened portion of the bristles thus bundled is introduced into the mold for forming the handle portion, and the plastic material of the handle portion is injected and filled. Then, by hardening the plastic, each hair bundle is integrally fixed in the handle portion. It is known that (Japanese Patent Publication No. 6-1672)
No. 5, gazette and Tokuhyo 2-503150).

[0003]

In the conventional method of forming a fused mass at the end of a hair bundle and then injecting a molding material into a mold to mold a bristle member or a brush, the bristle strength (molding strength) In order to improve the difficulty of pulling out the hair bundle from the body), it is preferable to inject the molding material into the mold with the hair bundle fusion mass inserted deeply into the mold, but the pressure during injection molding There is a drawback that the molding material flows out from the through hole to cause burrs. This burr is a part of the molding material that exudes from the gap between the hair bundle and the through hole.
Although it is possible to reduce the occurrence rate and size of burrs to some extent by increasing the density of hair bundles in the through holes and adjusting molding conditions such as injection pressure and injection speed,
Burrs protruding from the flocked surface impair the product appearance and
The large burr had a problem that it might damage the oral cavity. Therefore, the fused mass at the protruding end of the hair bundle is made into a fused mass having a cross section larger than the cross section of the through hole, and the through hole is closed by this fused mass when the molding material is injected (Japanese Patent Publication No.
No. 16725) is also proposed, but since the fused mass of the hair bundle is near the head surface, it is not sufficiently satisfactory for the hair transplant strength, and the hair tuft easily spreads outward from the root of the hair transplant, resulting in poor hairiness. There was also. In addition, a method of inserting the fused mass of hair bundle deeply into the mold of the head part and molding (Special Table 2-5
No. 03150) is a problem because it may be deformed by injection of the molding material depending on the thickness of the sleeve. The present invention is intended to easily eliminate these conventional drawbacks, high flocking strength, it is possible to obtain a flocked state with good flocking,
Moreover, it is to obtain a safe molding method in which burrs do not easily come out above the flocked surface.

[0004]

SUMMARY OF THE INVENTION According to the present invention, a hair bundle is introduced into a hair bundle insertion through hole provided in a handle molding die to project one end of the hair bundle, and heat the protruding end portion. By means of forming a fused mass having a cross section larger than the cross section of the through hole, positioning the fused mass in the mold cavity for handle molding, introducing the molding material, and molding the handle by hardening the molding material, In a method for manufacturing a brush in which the bristles are integrally implanted in a handle, a movable sleeve having a through hole for the bristles is used in a handle-molding mold so as to be slidable, and the opening of the movable sleeve is used. After abutting the fused mass at the end to close the through hole, the cavity is filled with a molding material, and the movable sleeve is moved in a direction opposite to the fusion mass before the molding material is solidified, Fusion with movable sleeve tip By forming a gap between the hair and the root of the hair bundle from the opening end of the through-hole and holding the fused mass and the root of the hair bundle with the molding material, good flocking with high flocking strength is achieved. It is a brush.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In this brush manufacturing method, a fused mass at one end of a bristle bundle is projected into an inner space of a mold for molding a handle,
By injecting the molding material into the mold, when molding the flocking member or brush, it was generated by pulling up the movable sleeve in the direction opposite to the fusion mass while the injected molding material was soft before it solidified. By filling the gap with the molding material, the fused mass and the root of the hair bundle are held by the molding material, and a cylindrical rib is formed on the outer circumference of the root of the hair bundle to provide high hair transplant strength and good hair transplant. It is possible to obtain a good quality brush that is obtained and has less burrs.
That is, at the time of injection molding, the fused mass can prevent the molding material from flowing out from the gap between the hair bundle and the through hole to become a burr, by closing the through hole for inserting the hair bundle. Since the entire fused mass can be held in the molding material, sufficient flocking strength can be obtained, and by forming a cylindrical rib at the root of the hair bundle, it is possible to achieve flocking with good hair, and the fused mass Since it can be located above the flocked surface, the flocked member or the brush head can be made sufficiently thin.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the examples of FIGS. 1 to 3. The handle molding die 10 is provided with a through hole 11 for inserting a hair bundle through a movable sleeve 5 and a predetermined length. The hair bundle 1 cut into pieces is introduced by the hair bundle insertion pin 15 to project one end of the hair bundle, and the projecting end portion is penetrated by a heating plate 12 by a heat source 12 ₁ or heating means 12 such as hot air or infrared rays. A fused mass 2 having a cross section larger than that of 11 is formed, and the fused mass 2 is positioned in the cavity 13 of the handle molding die 10 to close the handle molding die 10 or after closing the mold. When the fused mass 2 is positioned in the cavity 13 and a molding material is introduced, and the hair bundle 1 is integrally transplanted to the handle 3 by the handle molding by hardening the molding material, the through hole 11 is formed. The movable sleeve 5 having Used slidably provided mold Le mold 10, the through hole opening end 11 ₁ of the movable sleeve 5
The fused mass 2 is abutted on and the through hole 11 is closed,
The distal end surface of the movable sleeve and the inner surface of the mold are substantially aligned with each other so that the fusion mass 2 is positioned in the cavity 13 to fill the molding material in the cavity, and the movable sleeve 5 is moved while the molding material is soft before being solidified. While moving in the direction opposite to the fused mass 2 to form a gap between the movable sleeve tip 11 ₁ and the fused mass 2, the molding material is filled around the root of the hair bundle to fuse the mass 2 and root of the hair bundle. By holding 1 ₁ with a molding material, a high-quality brush with high flocking strength can be obtained.

In this case, the hair bundle insertion pin 15 is slidably inserted into each of the hair bundle through holes 11 in the movable sleeve 5 provided in the handle forming mold 10 in a plurality, and each hair bundle 1 is predetermined. The fused mass 2 is fixed in the cavity 13 by stopping at the position, and it is preferable that the hair bundle insertion pins 15 are simultaneously moved in a lump. The thickness of the movable sleeve 5 is 0.1 to 1.0 mm, preferably 0.2.
The moving distance of the movable sleeve 2 is 0.1 to 0.5 mm.
2.0 mm, preferably 0.2 to 1.0 mm.
Further annular rib 3 formed around the tuft base portion 1 _{1
In the case of 1} , the hair bundle is kept straight from the root of the planted part without spreading to the outside, and the hair is kept in good condition.

Furthermore before the molding material to be filled is solidified in the cavity 13, with softness the molding material in the gap caused by movement of the movable sleeve 5 can flow, is a molding material around the tuft base portion 1 ₁ select the time that can be fulfilled crowded around the in tuft insertion pin 15 pressing the hair bundle 1, e.g., for the tufts fused mass 1 and tufts root portion 1 ₁ can be reliably held by the molding material, sufficient flocking strength Is obtained, and the hair can be transplanted with good hair. At the time of this injection molding, the fused mass 2 closes the hair bundle through-hole 11 so that the molding material can be prevented from flowing out of the through-hole and becoming burr, which is convenient.

In the embodiment shown in FIG. 4, the fusion mass 2 is brought into contact with the open end 11 ₁ of the hair bundle through-hole 11 and held in a state of being pushed into the central position of the cavity 13 to fill the cavity 13 with the molding material. After that, while the molding material is soft, the movable sleeve 5 is pulled up and the molding material is drawn into and filled in the gap, and the annular rib portion 3 ₁ is formed around the root of the hair bundle 1 ₁ so that the hair transplant strength is high and the hair is good. It can be used as a brush, and the burr-generating portion is also buried in the handle 3 so that it cannot be seen and the appearance quality is greatly improved.

In the specific example of FIG. 5, a cavity is provided between the through-hole opening end 11 _{1 of the} movable sleeve 5 and the fusion mass 2 so that the movable sleeve front end surface and the mold inner surface are substantially aligned with each other. After the fused mass 2 is positioned inside, the molds 10 and 10 for molding the handle are closed, and then the cavity 13 is filled with the molding material, and the movable sleeve 5 is fixed before the molding material solidifies. By moving in the direction opposite to the fused mass 2 and filling the molding material around the root of the hair bundle through the gap between the tip of the movable sleeve and the fused mass 2, the fused mass 2 and the root of the hair bundle 1 ₁ are molded. It can be held by a material to increase the strength of flocking. That is, during injection molding, part of the molding material
Although it flows out from the gap between the through hole and the hair bundle, before the molding material solidifies, by filling the molding material into the gap between the hair bundle and the through hole generated by pulling the sleeve outward in the mold, By forming an annular rib at the root of the hair bundle, it is possible to prevent the occurrence of burrs, and since the entire fused mass can be retained in the molding material, sufficient flocking strength can be obtained, and the root of the hair bundle can be obtained. By forming ribs on the bristle, it is possible to achieve flocking with good hair raising, and the fused mass can be positioned arbitrarily from above to below the flocking surface. The degree of freedom in design is increased and the molding material is injected with the gap between the fused mass and the tip of the sleeve left open, so there is no need to pull up the hair bundle to close the sleeve hole with the fused mass. In addition to there, the molding material leaking from the gap between the fused mass and the bristle tufts may be a good brushes appearance quality in yo quality not be a burr to be contained in the annular rib.

In this case, the movable sleeve 5 may be _one in which the opening end of the handle forming mold on the side of the cavity 13 is chamfered in a conical shape to form a gap with the fused mass 2. conical surface to the annular rib portion 3 ₁ is conveniently made in the top.

The present invention also includes the following characteristic structure. A hair bundle insertion pin is slidably inserted into each of the hair bundle through holes to fix the hair bundle at a predetermined position, and a movable sleeve is moved to form a gap between the fused mass and the root of the hair bundle. A method for manufacturing a brush in which the molding material is induction-filled around the root of the hair bundle. A hair bundle insertion pin is slidably inserted into each of the hair bundle through holes, and when the movable sleeve moves, the hair bundle insertion pin pushes the hair bundle in a direction opposite to the movable sleeve, and the through hole opening end. A method of manufacturing a brush, in which the fused mass is embedded in the molding material in the cavity and the molding material is filled around the root of the hair bundle. The hair bundle is introduced into the through hole for inserting the hair bundle provided in the handle forming die, one end of the hair bundle is projected, and the protruding end is fused by the heating means to have a cross section larger than the cross section of the through hole. A lump is formed, the fusion lump is positioned in a cavity of a handle molding die, a molding material is introduced, and the brush is produced by curing the molding material to manufacture a brush in which the bristles are integrally implanted on the handle. In the method described above, a movable sleeve having a through hole of the hair bundle is slidably provided in a handle molding die, and a gap is formed between the open end of the movable sleeve and the fused mass. After that, while filling the molding material in the cavity and moving the movable sleeve in the direction opposite to the fusion mass before the molding material solidifies, the hair bundle is moved from the gap between the tip of the movable sleeve and the fusion mass. Molding material around the root Brush manufacturing method was held at molding material fused mass and tufts root portion is filled with. A method for manufacturing a brush, wherein the movable sleeve is one in which the opening end in the cavity of the handle molding die is conically chamfered to form a gap with the fused mass.

At the time of injection molding, a part of the molding material flows out from the gap between the through hole and the hair bundle, but before the molding material is solidified, the sleeve generated by pulling the sleeve outward in the mold. By filling the molding material into the gap between the bundle and the through-hole, an annular rib portion is formed at the root of the hair bundle, so that burrs can be prevented and the entire fused mass can be retained in the molding material. For this reason, sufficient flocking strength can be obtained, and by forming ribs at the root of the hair bundle, it is possible to achieve flocking with good hair fluffing, and the fused mass can be positioned at any position from above the flocking surface to below it. Since it is possible to increase the flexibility of dimensional design of the base of the flocking member or the brush head part, and the molding material is injected with the gap between the fused mass and the tip of the sleeve opened, the hair bundle is Pulling up In addition to the advantage that the step of closing the sleeve hole with the fused mass is not necessary, the molding material exuded from the gap between the fused mass and the hair bundle is enclosed in the annular rib part and does not become a burr and is of good quality. The brush can have a good appearance quality.

[0014]

According to the present invention, a mold having a movable sleeve having through-holes for hair bundles slidably mounted on a handle mold is used, and the fused mass is brought into contact with the open end of the movable sleeve. After the through hole is closed, the molding material is filled in the cavity, and the movable sleeve is moved in the direction opposite to the fusion mass before the molding material is solidified so as to move between the tip of the fusion sleeve and the fusion mass. By forming a gap and filling the molding material around the root of the hair bundle from the opening end of the through hole to hold the fused mass and the root of the hair bundle with the molding material, the fused mass is inserted into the hair mass during handle injection molding. By closing the through-holes, it is possible to prevent the molding material from flowing out of the gap between the hair bundle and the through-holes to form burrs, and it is possible to hold the entire fused mass in the molding material. Flocking strength is obtained and at the root of the hair bundle By forming a cylindrical rib, flocking with good bristle can be achieved, and since the fused mass can be located above the flocking surface, the flocking member or brush head part can be made sufficiently thin and good quality is achieved. Therefore, the appearance quality and reliability can be high.

[Brief description of drawings]

FIG. 1 is a process explanatory diagram of manufacturing of an embodiment of the present invention, in which (a) is a hair bundle inserting step, (b) is a fused mass forming step, (c) is a step immediately before injection molding, and (d) is a hair bundle pushing step. , (E) shows a mold release process.

2A and 2B are enlarged vertical cross-sectional views of a part of the molding process of the example of FIG. 1, in which FIG.

FIG. 3 is a perspective view of a portion of the product.

FIG. 4 is an enlarged vertical cross-sectional view of a part of the process of the manufacturing method of another embodiment of the present invention, in which (a) shows the time of injection and (b) shows the time immediately after the injection.

FIG. 5 is an enlarged vertical sectional view of a part of the manufacturing process of still another embodiment of the present invention, (a) showing the time of injection, (b) showing the time immediately after the injection.

[Explanation of symbols]

1 Hair Bundle 1 ₁ Root of Hair Bundle 2 Fusion Mass 3 Handle 3 ₁ Annular Rib 4 Brush 5 Movable Sleeve 5 ₁ Chamfer 10 Handle Mold 11 Through Hole 11 ₁ Open End 12 Heating Means 12 ₁ Heat Source 13 Cavity 15 Hair Bundle insertion pin

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[Procedure amendment]

[Submission date] November 16, 1995

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

Title: Brush and method of manufacturing the same

[Claims]

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a brush, such as a toothbrush or a hairbrush, in which a plastic brush portion is integrated at the time of molding a handle portion, and a method for producing the brush.

[0002]

2. Description of the Related Art Recently, instead of a brush in which a bunch of hair is fixed to a hair-implanting hole in a handle using a metal piece or a metal wire,
It has been proposed to integrate a brush part made of plastic at the time of molding the handle part. Traditionally, with this kind of brush,
One end of the bristled brush is melted to form a fused mass,
The thickened portion of the bristles thus bundled is introduced into the mold for forming the handle portion, and the plastic material of the handle portion is injected and filled. Then, by hardening the plastic, each hair bundle is integrally fixed in the handle portion. It is known that (Japanese Patent Publication No. 6-1672)
No. 5, gazette and Tokuhyo 2-503150).

[0003]

According to the conventional method of forming a fused mass at the end of a hair bundle and then injecting a molding material into a mold to mold a bristle member or a brush, the bristle strength ( In order to improve the difficulty of pulling out the hair bundle from the molded body, it is preferable to inject the molding material into the mold with the hair bundle fused mass inserted deeply into the mold. However, there is a drawback that the molding material flows out from the through hole to cause burrs. This burr is a part of the molding material that exudes from the gap between the hair bundle and the through hole.
Although it is possible to reduce the occurrence rate and size of burrs to some extent by increasing the density of hair bundles in the through holes and adjusting molding conditions such as injection pressure and injection speed,
Burrs protruding from the flocked surface impair the product appearance and
The large burr had a problem that it might damage the oral cavity. Therefore, the fused mass at the protruding end of the hair bundle is made into a fused mass having a cross section larger than the cross section of the through hole, and the through hole is closed by this fused mass when the molding material is injected (Japanese Patent Publication No.
No. 16725) is also proposed, but since the fused mass of the hair bundle is near the head surface, it is not sufficiently satisfactory for the hair transplant strength, and the hair tuft easily spreads outward from the root of the hair transplant, resulting in poor hairiness. There was also. In addition, a method of inserting the fused mass of hair bundle deeply into the mold of the head part and molding (Special Table 2-5
No. 03150) is a problem because it may be deformed by injection of the molding material depending on the thickness of the sleeve. The present invention is intended to easily eliminate these conventional drawbacks, high flocking strength, it is possible to obtain a flocked state with good flocking,
And a safe brush that burr does not easily come out above the flocked surface,
To obtain an effective molding method.

[0004]

SUMMARY OF THE INVENTION The present invention is a brush in which one end of a bundle of bristles of a bristled bundle is melted to form a fused mass, and the fused mass is embedded in a head portion of a handle. An annular rib portion is integrally formed on the outer circumference of the root portion of the bundle so as to protrude from the surface of the head portion. Further, according to the present invention, a bristle bundle is introduced into a through hole for inserting a bristle bundle provided in a handle molding die so that one end of the bristle bundle is projected, and the protruding end portion is heated by a heating means to have a cross section of the through hole. Forming a fused mass having a larger cross section, positioning the fused mass in the mold cavity for the handle molding, introducing the molding material, and curing the molding material to mold the handle, whereby the hair bundle is integrated with the handle. In the method for producing a brush with flocked hair, a mold provided with a movable sleeve having a through hole of the bristle bundle slidably on a handle mold, and the fused mass is applied to the open end of the movable sleeve. After contacting the through hole and filling the cavity with the molding material, the movable sleeve is moved in the direction opposite to the fusion mass before the molding material is solidified, and the movable sleeve tip and the fusion mass are separated. Forming a gap between It is an excellent brush high bristles standing of flocking strength by being allowed to fused mass and tufts root portion filled with molded material around bristle bundle root portion from the through-hole open end was held in the molding material.

[0005]

BEST MODE FOR CARRYING OUT THE INVENTION In the embodiments of the present invention, a flocked member or a brush is fixed by projecting a fused mass at one end of a hair bundle into a space inside a mold for molding a handle and injecting a molding material into the mold. During molding, while the injected molding material is soft before it solidifies, the movable sleeve is pulled up in the direction opposite to the fusion mass and the gap created is filled with the molding material to form the fusion mass and the root of the hair bundle. Since it is held with a molding material, a cylindrical rib is formed on the outer periphery of the root of the bristles of the brush, and the bristle strength is high, and a bristle-polished state with good bristling is obtained, and a good-quality brush with less burr Obtainable. That is, at the time of injection molding, the fused mass can prevent the molding material from flowing out from the gap between the hair bundle and the through hole to become a burr, by closing the through hole for inserting the hair bundle. Because the entire fused mass can be retained in the molding material,
Sufficient flocking strength can be obtained, and by forming a cylindrical rib at the root of the hair bundle, flocking with good flocking can be achieved, and since the fused mass can be located above the flocking surface, a flocking member or The brush head can be made sufficiently thin.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to the examples of FIGS. 1 to 3. The handle molding die 10 is provided with a through hole 11 for inserting a hair bundle through a movable sleeve 5 and a predetermined length. is projected to one end of the hair bundle hair bundle 1 was trimmed to be introduced by the tuft insertion pin 15 of the heat plate or hot air projecting end portion by the heat source 12 _1, the heating means 12 such as an infrared, through-holes A fused mass 2 having a cross section larger than that of 11 is formed, and the fused mass 2 is positioned in the cavity 13 of the handle molding die 10 to close the handle molding die 10 or after closing the mold. When the fused mass 2 is positioned in the cavity 13 and a molding material is introduced, and the hair bundle 1 is integrally transplanted to the handle 3 by the handle molding by hardening the molding material, the through hole 11 is formed. The movable sleeve 5 having A mold provided slidably on the dollar forming mold 10 is used, and the through hole opening end 11 _{1 of the} movable sleeve 5 is used.
The fused mass 2 is abutted on and the through hole 11 is closed,
The distal end surface of the movable sleeve and the inner surface of the mold are substantially aligned with each other so that the fusion mass 2 is positioned in the cavity 13 to fill the molding material in the cavity, and the movable sleeve 5 is moved while the molding material is soft before being solidified. while the fused mass 2 is moved in the direction opposite to form a gap between the movable sleeve distal end 11 ₁ and a fused mass 2, fused mass is filled with the molding material around bristle tufts root portion 2 and the bristle bundle root portion to hold the 1 ₁ in the molding material is a high-quality good brushes flocking strength.

In this case, the hair bundle insertion pin 15 is slidably inserted into each of the hair bundle through holes 11 in the movable sleeve 5 provided in the handle forming mold 10 in a plurality, and each hair bundle 1 is predetermined. The fused mass 2 is fixed in the cavity 13 by stopping at the position, and it is preferable that the hair bundle insertion pins 15 are simultaneously moved in a lump. The thickness of the movable sleeve 5 is 0.1 to 1.0 mm, preferably 0.1.
The moving distance of the movable sleeve 5 is 2 to 0.5 mm.
0.1 to 2.0 mm, preferably 0.2 to 1.0 mm. Further annular rib portion 3 ₁ which is formed around the tuft base portion 1 ₁ from the base of the tufts is flocked portion, care is taken to keep the hair standing better state have upright without spreading outward .

Furthermore before the molding material to be filled is solidified in the cavity 13, with softness the molding material in the gap caused by movement of the movable sleeve 5 can flow, is a molding material around the tuft base portion 1 ₁ select the time that can be fulfilled crowded around the in tuft insertion pin 15 pressing the hair bundle 1, e.g., for the tufts fused mass 1 and tufts root portion 1 ₁ can be reliably held by the molding material, sufficient flocking strength Is obtained, and the hair can be transplanted with good hair. At the time of this injection molding, the fused mass 2 closes the hair bundle through-hole 11 so that the molding material can be prevented from flowing out of the through-hole and becoming burr, which is convenient.

[0009] In the specific example of FIG. 4, filled with the molding material held in pushed state in a central position of the tuft holes 11 of the opening end 11 ₁ to contacting the fused mass 2 cavity 13 in the cavity 13 After that, while the molding material is soft, the movable sleeve 5 is pulled up and the molding material is drawn into the gap to fill the gap, and the annular rib portion 3 ₁ is formed around the hair bundle root portion 1 ₁ to have high hair transplant strength and good hair raising. It can be used as a brush, and the burr-generating portion is also buried in the handle 3 so that it cannot be seen and the appearance quality is greatly improved.

[0010] In the specific example of FIG. 5, a gap between the through-hole open end 11 ₁ and the fused mass 2 of the movable sleeve 5, substantially aligned with the movable sleeve distal end surface and the inner surface of the mold cavity After the fused mass 2 is positioned inside, the molds 10 and 10 for molding the handle are closed, and then the cavity 13 is filled with the molding material, and the movable sleeve 5 is fixed before the molding material solidifies. By moving in the direction opposite to the fused mass 2 and filling the molding material around the root of the hair bundle through the gap between the tip of the movable sleeve and the fused mass 2, the fused mass 2 and the root of the hair bundle ₁₁ are molded. It can be held by a material to increase the strength of flocking. That is, during injection molding, part of the molding material
Although it flows out from the gap between the through hole and the hair bundle, before the molding material solidifies, by filling the molding material into the gap between the hair bundle and the through hole generated by pulling the sleeve outward in the mold, By forming an annular rib at the root of the hair bundle, it is possible to prevent the occurrence of burrs, and since the entire fused mass can be retained in the molding material, sufficient flocking strength can be obtained, and the root of the hair bundle can be obtained. By forming ribs on the flock, it is possible to achieve flocking with good hair raising, and since the fused mass can be positioned arbitrarily from above to below the flocking surface, the size of the base of the flocking member or the brush head part The degree of freedom in design is increased and the molding material is injected with the gap between the fused mass and the tip of the sleeve left open, so there is no need to pull up the hair bundle to close the sleeve hole with the fused mass. In addition to there, the molding material leaking from the gap between the fused mass and the bristle tufts may be a good brushes appearance quality in yo quality not be a burr to be contained in the annular rib.

In this case, the movable sleeve 5 used is _one in which the opening end on the cavity 13 side in the handle molding die is chamfered 51 in a conical shape to form a gap with the fused mass 2. the even conical surface to the annular rib portion 3 ₁ is conveniently made in the top.

The present invention also includes the following characteristic structure. A hair bundle insertion pin is slidably inserted into each of the hair bundle through holes to fix the hair bundle at a predetermined position, and a movable sleeve is moved to form a gap between the fused mass and the root of the hair bundle. A method for manufacturing a brush in which the molding material is induction-filled around the root of the hair bundle. A hair bundle insertion pin is slidably inserted into each of the hair bundle through holes, and when the movable sleeve moves, the hair bundle insertion pin pushes the hair bundle in a direction opposite to the movable sleeve, and the through hole opening end. A method of manufacturing a brush, in which the fused mass is embedded in the molding material in the cavity and the molding material is filled around the root of the hair bundle. The hair bundle is introduced into the through hole for inserting the hair bundle provided in the handle forming die, one end of the hair bundle is projected, and the protruding end is fused by the heating means to have a cross section larger than the cross section of the through hole. A lump is formed, the fusion lump is positioned in a cavity of a handle molding die, a molding material is introduced, and the brush is produced by curing the molding material to manufacture a brush in which the bristles are integrally implanted on the handle. In the method described above, a movable sleeve having a through hole for the hair bundle is slidably provided in a handle molding die, and a gap is formed between the open end of the movable sleeve and the fused mass. After that, while filling the molding material in the cavity and moving the movable sleeve in the direction opposite to the fusion mass before the molding material solidifies, the hair bundle is moved from the gap between the tip of the movable sleeve and the fusion mass. Molding material around the root Brush manufacturing method was held at molding material fused mass and tufts root portion is filled with. A method for manufacturing a brush, wherein the movable sleeve is one in which the opening end in the cavity of the handle molding die is conically chamfered to form a gap with the fused mass. An annular rib portion projecting on the outer periphery of the hair bundle root portion of the brush,
A brush whose top surface is conical.

At the time of injection molding, a part of the molding material flows out from the gap between the through hole and the hair bundle, but before the molding material is solidified, the sleeve generated by pulling the sleeve outward in the mold. By filling the molding material into the gap between the bundle and the through-hole, an annular rib portion is formed at the root of the hair bundle, so that burrs can be prevented and the entire fused mass can be retained in the molding material. Therefore, sufficient flocking strength can be obtained, and by forming an annular rib portion at the root of the hair bundle, it is possible to achieve flocking with good hair fluffing, and the fused mass can be applied from above the planted surface to below the planted surface. Since it can be positioned at the position of the flocking member, the degree of freedom in dimensional design of the base of the flocking member or the brush head is increased, and the molding material is injected with the gap between the fused mass and the tip of the sleeve opened, so A bunch In addition to the advantage that there is no need to lift up the fusion block to close the sleeve hole, the molding material exuded from the gap between the fusion block and the hair bundle is enclosed in the annular rib and does not become a burr. A brush with good quality and good appearance can be obtained.

[0014]

According to the present invention, a mold having a movable sleeve having through-holes for hair bundles slidably mounted on a handle mold is used, and the fused mass is brought into contact with the open end of the movable sleeve. After the through hole is closed, the molding material is filled in the cavity, and the movable sleeve is moved in the direction opposite to the fusion mass before the molding material is solidified so as to move between the tip of the fusion sleeve and the fusion mass. By forming a gap and filling the molding material around the root of the hair bundle from the opening end of the through hole to hold the fused mass and the root of the hair bundle with the molding material, the fused mass is inserted into the hair mass during handle injection molding. By closing the through-holes, it is possible to prevent the molding material from flowing out of the gap between the hair bundle and the through-holes to form burrs, and it is possible to hold the entire fused mass in the molding material. Flocking strength is obtained and at the root of the hair bundle By forming a tubular annular rib part, it is possible to achieve flocking with good hair raising, and since the fused mass can be located above the flocking surface, the flocking member or brush head part can be made sufficiently thin. In addition, the quality can be good and the appearance quality and reliability can be high.

[Brief description of drawings]

FIG. 1 is a process explanatory diagram of manufacturing of an embodiment of the present invention, in which (a) is a hair bundle inserting step, (b) is a fused mass forming step, (c) is a step immediately before injection molding, and (d) is a hair bundle pushing step. , (E) shows a mold release process.

2A and 2B are enlarged vertical cross-sectional views of a part of the molding process of the example of FIG. 1, in which FIG.

FIG. 3 is a perspective view of a portion of the product.

FIG. 4 is an enlarged vertical cross-sectional view of a part of the process of the manufacturing method of another embodiment of the present invention, in which (a) shows the time of injection and (b) shows the time immediately after the injection.

FIG. 5 is an enlarged vertical sectional view of a part of the manufacturing process of still another embodiment of the present invention, (a) showing the time of injection, (b) showing the time immediately after the injection.

[Explanation of Codes] 1 hair bundle 1 ₁ hair bundle root portion 2 fused mass 3 handle 3 ₁ annular rib portion 4 brush 5 movable sleeve 5 ₁ chamfer 10 handle molding die 11 through hole 11 ₁ open end 12 heating means 12 ₁ Heat source 13 Cavity 15 Hair bundle insertion pin

Claims (1)

[Claims] 1. A hair bundle is introduced into a through hole for hair bundle insertion provided in a handle molding die to project one end of the hair bundle,
The protruding end portion is formed with a heating means to form a fused mass having a cross section larger than the cross-section of the through hole, and the fused mass is positioned in the mold cavity for the handle molding, and then the molding material is introduced to remove the molding material. In a method of manufacturing a brush in which the bristles are integrally planted on a handle by molding a handle by curing, a mold provided with a movable sleeve having a through hole of the bunch slidably in a handle molding mold, After the fusion mass is brought into contact with the open end of the movable sleeve to close the through hole, the molding material is filled in the cavity, and the movable sleeve is moved in the direction opposite to the fusion mass before the molding material solidifies. To form a gap between the distal end of the movable sleeve and the fused mass, and the molding material was filled around the root of the hair bundle from the opening end of the through hole to hold the fused mass and the root of the hair bundle with the molding material. Characterized by Brush manufacturing method that.