JPH0271710A - Brush handle and manufacture thereof - Google Patents

Abstract

PURPOSE:To reduce production cost by integrally forming a facing body on the handle part, and exposing both materials, a shaft material and a facing material at least on a part of the outside surface of the handle part. CONSTITUTION:A brush handle comprising a handle part 3, on one end of which a head 1 with a bristle part A is provided via a neck part 2, is provided with a facing body 4 which has been integrally formed by injection-molding synthetic resin by means of male and female metal molds, and on the one end of the facing body 4, a hole part 5 is provided, and also in the vicinity of the other end thereof on the opposite side of the hole part 5, a locking hole 6 for hanging the handle is formed. And the handle brush is constituted in such a way that it provides with a neck part 2 projected from the hole part 5, and the facing body 4 is formed so as to be integral with the handle part 3, and further two materials, both the shaft material and the facing material, are coexistingly provided so as to be exposed at least on a part of the outside surface of the handle part 3. The facing body 4 is made up of a facing material of synthetic resin softer than the shaft material such as ABS resin, or elastomer consisting of copolymer or the like such as propylene and butadiene, and constitutes the handle part 3 whose color is different from that of the shaft material and which is formed by two colors, and further it is a cup-shaped covering body in the one end on the back side of which the hole part 5 for inserting the neck part 2 of the shaft is formed.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to an improvement in molding a brush handle from two types of materials to facilitate handling of a brush such as a toothbrush.

[Conventional technology]

Conventionally, brush handles, especially toothbrushes, consist of a handle with a bristle head attached to one end through the neck, and are most commonly made of one type of synthetic resin using a molding machine; Depending on the molding method used with the material, molding is performed using a rotary type or core bank type two-color molding machine, or an insert method is used. In other words, after molding the shaft part of the brush with the secondary side resin, the product is moved while attached to the movable side mold, and the stationary side mold is replaced and the secondary side resin is filled and molded. In addition to the color molding method and the core bank molding method, in which a part of the mold is depressed after molding the shaft part and filled with secondary resin, the shaft part is first molded with the primary resin, and then the final molding is performed. The insert method is used, in which the shaft material is placed in a shaped mold and filled with secondary resin around the shaft material, and this is integrated with the shaft material as an exterior body, and the gate is usually provided on the end face of the handle. That is the reality.

[Problem to be solved by the invention]

In these conventional molding methods, the shaft part is molded and the secondary side is filled with resin. It is impossible to mold a product in which the shaft protrudes through the through hole or opening of the mold, and the design is restricted and there is no flexibility, resulting in a product with poor commercial value. Even if the surface of the shaft material is deformed due to sink marks, etc., a gap is created between the surface that should be in close contact with the mold and the mold, and the resin wraps around the gap, creating a boundary between two different materials. There were problems such as overlaps and unevenness, resulting in unsightly and poor finishing, which significantly reduced the product value, making it uneconomical to sell as a product.

The present invention is intended to accurately eliminate these conventional drawbacks, and by adopting an insert method, the molding finish on the external surface of the brush handle is extremely good, and there is also freedom in design. The object of the present invention is to provide a brush handle and a method for manufacturing the brush handle, which can significantly increase the commercial value, significantly improve workability, and reduce production costs.

[Means for Solving the Problems] In the present invention, the shaft material of the brush handle, which has a handle portion 3 on which the head 1 capable of forming the flocked portion A is provided via the neck portion 2, is injection molded of synthetic resin by an insert method. The handle part 3 is integrally molded with an exterior body 4, and the two materials, the shaft material and the exterior material, are exposed and coexist on at least a part of the outer surface of the handle part 3. The brush handle is characterized by having a brush handle.

In addition, as a method for manufacturing this brush handle, a molded product made of two materials, the shaft material of the brush handle with the handle part 3 and the exterior material of the exterior body 4 provided on the handle part 3, is used. In order to do this, the exterior body 4 having a through hole or opening at one end is molded in advance using a pair of separate molds, and then the exterior body 4 is
is inserted into and held in the cavity of a mold for molding the shaft portion, and the shaft material is injected into the cavity and filled into the inside of the exterior body 4 through the through hole or opening to push the exterior body 4. One of the characteristics of the brush handle molding method is that it is spread out, solidified, insert molded, and released.

[For production]

In this brush handle, the handle part 3 is integrally molded with the exterior body 4, and the two materials, the shaft material and the exterior material stopper, are exposed and coexist on at least a part of the outer surface of the handle part 3. This makes it easy to safely produce products without interfering with handle operation, and the appearance of the outside of the handle is good, and the printing finish is improved without being limited by design, which can significantly increase product value. It is possible. In particular, when making a molded product made of two materials, the shaft material of the brush handle with the handle part 3 and the exterior material of the exterior body 4 provided in the core handle part 3, a through hole or opening is preliminarily provided at one end. Exterior body 4
is molded in a pair of separate molds, and then the sheathing body 4 is inserted and held in the cavity of the mold for molding the shaft portion, and the shaft material is injected into the cavity and passed through the through hole or opening. By filling the inside of the exterior body 4, spreading the exterior body 4 and solidifying it, insert molding, and releasing the mold, the product surface can be molded smoothly even if there is a boundary between different materials.
In addition, the exterior body and the shaft are strongly integrated, the grip feeling is extremely good without causing any peeling phenomenon, and the appearance and aesthetic appeal are greatly enhanced.

〔Example〕

Embodiments of the present invention will be explained with reference to FIGS. 1 to 7 as an example of a toothbrush.
A brush handle consisting of a handle portion 3 provided through the handle is integrally molded with an exterior body 4 made of synthetic resin and injection molded using male and female molds 89, and one end side of the exterior body 4 A hole 5 is provided in the hole 5, a locking hole 6 for suspending the handle is formed near the other end on the opposite side of the hole 5, and a neck 2 protrudes from the hole 5. 3 and an exterior body 4 are integrally molded, and the two materials, the shaft material and the exterior material, are exposed and coexist on at least a part of the outer surface of the handle portion 3.

In this case, as the exterior body 4, the shaft material, for example AB
S resin, AS resin, polypropylene resin.

The outer material is made of a more flexible synthetic resin such as polyester resin, polycarbonate resin, polypropylene resin, or acrylic resin, or an elastomer made of a copolymer of propylene and butadiene or styrene and butadiene. Molded grip handle part 3
It is a cup-shaped covering body with a hole 5 formed at one end on the back side, into which the neck 2 of the shaft member is inserted.

That is, the exterior body 4 exposes the annular outer frame surface on the bottom side of the grip handle 3, allowing the shaft material and the exterior material to be partially expressed, and has a locking hole 6 at the other end. Cylindrical part 7 with
However, if necessary, the exterior body 4 may be of a type provided with a recessed groove or a separation band 4 that connects the shaft material with a separation line and exposes it to the outer surface of the grip handle 3. However, pattern holes such as diamonds, hearts, or other marks, or striped linear holes are also provided on the back side or side side of the exterior body 4.

In addition, when manufacturing this brush handle, the handle part 3
When making a molded product made of two materials, the shaft material of the brush handle and the exterior material of the exterior body 4 provided on the handle portion 3, a hole 5 or an opening of a through hole is formed at one end and the other end is pre-molded. After molding a pair of exterior bodies 4 having locking holes 6 using separate molds 8.9, the exterior bodies 4 are inserted and held in the cavity of a mold 8□91 for molding the shaft portion, and the shaft is molded. The material is injected into the can and tee, filled into the inside of the exterior body 4 through the through hole or opening, and solidified while spreading the exterior body 4 to perform insert molding, and then released from the mold. It can be produced efficiently.

In this case, for example, the exterior body 4 is formed into a cover member that covers both sides and the back surface of the grip handle portion 3 and has an open bottom, and has an uncut peripheral wall edge along the bottom. Hole 5 into which the neck 2 protruding from the handle 3 is fitted and integrated.
and the engagement hole 6 are preferably molded using a pair of separate molds, and as shown in FIGS. Split exterior body 4.4
The manufacturing method may be such that the shaft material is placed separately in a cavity of the handle part of a mold for forming the neck part 2 and handle part 3 of the hat 11, and the shaft material is injection-filled and integrally molded.

In any case, when the exterior body 4 is integrally molded onto the brush shaft material by the insert of the exterior body 4 to form a brush handle, the head 1 and the neck portion 2 including the exterior body 4 are
Consideration is being given to rounding the entire outer edge of the handle with no edges. Furthermore, it can be effectively applied not only to toothbrushes but also to body brushes and other cleaning brushes.

In the figure, reference numeral 10 denotes a bristle-planting hole, which is integrally molded with the head 1, and a bristle-planting portion A is formed by implanting and fixing brushes. 11° and 12 are resin injection paths.

〔Effect of the invention〕

The present invention is characterized in that an exterior body is integrally molded on a handle portion of a brush handle, and two materials, the shaft material and the exterior material, coexist and are exposed on at least a part of the outer surface of the handle portion. As a result, the product is made up of the shaft material and the exterior material, so there are fewer restrictions on the design, and even when you hold the handle, the exterior body has adsorption properties, giving a soft and warm feel, and prevents it from slipping. Even if there are boundaries on the external surface of the brush handle, they do not overlap and are unobtrusive.
It has a smooth surface finish that gives a good finish and looks good, and the handle part can be produced without being limited to any design, so there is more freedom in design and product value is increased. Integration with the body is easy and precise, and product deformation is less likely to occur, and even if a small deformation occurs, it is unnoticeable and has little effect on product value, so it can reduce variations in molded products and significantly improve product dimensional accuracy. This has the practical effect of making it a reliable product and making quality control easy.

In addition, when molding this brush handle, the shaft material resin is filled into the exterior body through the hole for fitting the neck part, so the exterior body is pushed out from the inside and molded and solidified while being tightly attached to the inside of the mold cavity. As a result, the resin of the shaft material does not wrap around the outside of the exterior body, and the boundaries between two different materials do not overlap, making it possible to produce a brush handle that is smoothly molded and has a good appearance. There is no need for edge processing, and there is no need for finishing processing, which has the effect of significantly reducing the production cost of safe and easy-to-grip brush handles.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention, and FIG. 5 is a perspective view of the exterior body, FIGS. 6 and 7 are explanatory sectional views of the molding process, and FIG. 8 (al (b) is a plan and bottom view of the brush handle of another embodiment. , Figure 9 is its side view,
Figure 1θ is a longitudinal cross-sectional view. A... Flocking part, l... Head, 2... Neck, 3...
... Grip handle, 4... Exterior body, 41... Separation band, 5
. . . hole portion, 6 . . . retaining hole, 7 . . . cylindrical portion, 8.
8. ．． 9. 9. ...Mold, 10...Following holes.

Claims (9)

[Claims] (1) The head (1) that can form the flocked part (A) has a neck part (
2) The shaft material of the brush handle with the handle part (3) provided through the handle part (3) is injection molded of synthetic resin by an insert method, and the outer body (4) is attached to the handle part (3). A brush handle characterized in that the two materials, the shaft material and the exterior material, are integrally molded and coexist and are exposed on at least a part of the outer surface of the handle portion (3). (2) The exterior body (4) is made of a synthetic resin exterior material that is more flexible than the shaft material, and constitutes a handle portion (3) that is molded in two different colors together with the shaft material. Claim 1
Brush handle as shown. (3) The exterior body (4) is made of an elastomer exterior material made of a copolymer of propylene and butadiene or styrene and butadiene, and has a hole (5) into which the neck (2) of the shaft member is inserted at one end. The brush handle according to claim 1 or 2, wherein the brush handle is a cup-shaped covering formed on the back side. (4) The exterior body (4) exposes the annular outer frame surface on the bottom side of the handle portion (3) and divides the shaft material and the exterior material into two parts, and the other end Attaching hole (6)
The toothbrush handle according to claim 2 or 3, further comprising a hollow cylindrical portion (7) projecting inward. (5) A groove or separation band (4_1) in which the exterior body (4) is exposed on the outer surface of the grip handle (3) with the shaft member as a separation line.
The toothbrush handle according to claim 3 or 4, comprising: (6) When making a molded product made of two materials: the shaft material of the brush handle with the handle part (3) and the exterior material of the exterior body (4) provided on the handle part (3), one end of the shaft material is prepared in advance. After molding the exterior body (4) having a through hole or opening with a pair of male and female molds, the exterior body (4) is inserted and held in the cavity of the mold for molding the shaft part, and the shaft material is molded. injected into the cavity,
A method for manufacturing a brush handle, comprising filling the inside of the exterior body (4) through the through hole or opening, and solidifying the exterior body (4) while spreading it out, insert molding, and releasing the mold. . (7) The exterior body (4) is formed into a cover member that covers both sides and the back of the grip handle (3) and has an open bottom, and has an uncut peripheral wall edge along the bottom. , handle part (
7. The brush handle according to claim 6, wherein the hole (5) into which the neck (2) protruding from the brush handle (3) is fitted and integrated and the engagement hole (6) are molded by a pair of male and female molds. Production method. (8) The exterior body (4) is divided into a plurality of parts with a separation band (4_1), and the plurality of divided exterior bodies (4) (4) are formed into a head (1), a neck part (2) and a handle part (3). 8. The method of manufacturing a brush handle according to claim 6 or 7, wherein the shaft material is integrally molded by injection filling the shaft material by separately disposing it in a cavity of a handle portion of a mold for forming the brush handle. (9) When integrally molding the exterior body (4) onto the brush shaft material using the insert of the exterior body (4) to form a brush handle, round the entire outer edge of the handle portion including the exterior body (4). A method for manufacturing a brush handle, characterized in that the brush handle is formed by molding.