JP2020062219A - Production method of oral care brush and oral care brush - Google Patents

Abstract

To provide a safe oral care brush which has less exposure of a metal core material, has preferable use feeling and high dropping resistant intensity of a brush to a handle part, and a production method thereof.SOLUTION: A production method of the invention comprises: a first step for inserting and fixing a first part 114 of a core material 110 into a metal mold 200, and arranging a second part 115 of the core material 110 so as to protrude from a metal mold 200; a second step for injecting a molten resin material into the metal mold 200 and integrally forming a handle part and a covered part covered with the handle part, thereby forming a substrate; and a third step for sandwiching a hair material between second parts 115 of a plurality of metal wire materials of the substrate, and twisting the second parts thereby forming a twisted part which holds the hair material.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a method for manufacturing a brush for oral care used for the purpose of removing toothbrush, tongue coating, stimulating mucous membranes, cleaning the oral cavity, and the like, and a brush for oral care manufactured by this method.

  BACKGROUND ART Conventionally, a brush for oral care including a handle part made of a resin material and a brush part joined to the handle part so as to be inserted into the oral cavity to perform a care operation in the oral cavity is widely known. The brush part has a core material made of a plurality of twisted metal wires and a bristle material held between the metal wires (for example, Patent Documents 1 and 2). The core material has a cover portion that covers the handle portion at one end side and a hair material holding portion that holds the hair material at the other end side. In this brush, a bristle material is sandwiched between two metal wire rods that form the core material, and a brush portion is formed by twisting the metal wire rods. Then, one end side of the core material that does not hold the bristle material is Manufactured by a so-called insert molding method, in which the core material covering portion and the handle portion are integrally formed by inserting and fixing in the cavity of the injection molding die and press-fitting the molten resin material into the cavity. . In this case, the heat of the resin melted during shaping is transferred to the core material, and the temperature of the portion of the core material near the mold becomes high (for example, 200 ° C. or higher). Therefore, if there is hair material in the high temperature portion, it may be damaged by heat. In order to avoid damage to the hair material due to heat, the core material is provided with an exposed portion of the metal wire material that does not hold the hair material from the mold for a predetermined length (for example, 20 mm or more).

JP, 2009-89849, A JP, 2018-68514, A

In the conventional oral care brush configured as described above, particularly when the caregiver uses it for patients who have difficulty in self-care, the exposed part of the core material is the mucous membrane or teeth in the oral cavity, gums, etc. It is easy to damage the oral cavity by touching, and it may cause excessive irritation to the patient, causing discomfort, foreign body sensation, and fear.
Therefore, it is an object of the present invention to provide a safe oral care brush having a small exposed portion of a metal core material, a good feeling in use, a high pull-out strength with respect to a handle portion of a brush portion, and a method for producing the same. I am trying.

Hereinafter, the present invention will be described with reference to the reference numerals of the accompanying drawings, but the present invention is not limited thereto.
In order to solve the above-mentioned problems, the method for manufacturing the brush for oral care 1 according to the present invention includes a first portion 114 to be a covering portion 112 of the core 110 in a mold 200 for injection-molding the handle portion 10. Is inserted and fixed, and the first step of arranging the untwisted second portion 115 to be the twisted portion 113 of the core material 110 so as to project from the mold and melting in the mold 200 Second, the base member 130 including the handle portion 10 and the core material 110 is formed by injecting a resin material to integrally form the handle portion 10 and the cover portion 112 of the core material 110 covered by the handle portion 10. And the hair material 120 is held by sandwiching the hair material 120 between the untwisted second portions 115 of the plurality of metal wires 111 of the base 130 and twisting the second portion 115. Form the twisted portion 113 And a third step. The oral care brush 1 of the present invention is manufactured by a method including the above first to third steps.

  According to the manufacturing method of the present invention, since the bristle material is not attached at the time of insert shaping of the base body including the core material and the handle portion, the hair material is not damaged by the heat transferred to the core material. The core material does not need to have an exposed part of the metal wire to avoid thermal damage to the hair during injection molding, so the contact of the metal into the oral cavity during use is greatly reduced and a good feeling of use is achieved. Is obtained.

It is explanatory drawing which shows the manufacturing process of the brush for oral care which concerns on this invention. It is explanatory drawing which shows the following process which manufactures the brush for oral care which concerns on this invention. It is explanatory drawing which shows the following process which manufactures the brush for oral care which concerns on this invention. It is explanatory drawing which shows the following process which manufactures the brush for oral care which concerns on this invention. An example of the brush for oral care manufactured through the manufacturing process which concerns on this invention is shown, (A) is a front view, (B) is sectional drawing. It is explanatory drawing which shows the process of manufacturing the other kind of brush for oral care which concerns on this invention. It is explanatory drawing which shows other embodiment of the core material of the brush for oral care which concerns on this invention.

An embodiment of the present invention will be described with reference to the drawings.
FIG. 5 shows an example of the brush for oral care according to the present invention. In FIG. 1, the oral care brush 1 includes a handle portion 10 and a brush portion 100. The brush portion 100 is joined to the handle portion 10 so that cleaning between teeth and frictional care of mucous membranes can be performed. The handle portion 10 is made of a thermoplastic resin material. The brush part 100 includes a core material 110 made of two metal wires 111, and a bristle material 120 held by the core material 110. In the illustrated example, the two metal wires 111 are composed of a single member that is continuous at the folded-back portion 111a on one end side, but the present invention is not limited to this. The core material 110 includes a covering portion 112 that covers the handle portion 10 and a twisting portion 113 that extends from the handle portion 10 and holds the bristle material 120.

  The oral care brush 1 is manufactured as follows. In FIG. 1, the metal wire material 111 which comprises the core material 110 is prepared. The core material 110 has two parallel wire portions 111b formed by folding back a single metal wire material 111 at a central annular folding portion 111a. The core material 110 includes a first portion 114 that is a covering portion 112 that is covered by the handle portion 10, and an untwisted second portion 115 that is a twisting portion 113. A mold 200 (only one of the pair is shown) for injection-molding the handle portion 10 has a cavity 210, a fixing pin 211 that fits into the folded portion 111a, and a parallel line portion 111b in a substantially airtight manner. It has a seal part 212 that extends out of the mold 200.

  The shape of the first portion 114 that serves as the covering portion 112 of the core material 110 may be another shape as shown in FIG. 7. In the structure shown in FIG. 7A, the metal wire material 111 is twisted in the first portion 114 which becomes the covering portion 112. 7B shows that the folded portion 111c of the metal wire rod 111 is disposed at one end on the second portion 115 side that becomes the twisted portion 113, and the metal wire rod is formed in the first portion 114 that becomes the covered portion 112. 111 is twisted.

  In the next step shown in FIG. 2, the core material 110 is mounted on the mold 200. The first portion 114 of the core material 110 is disposed in the cavity 210, and the pin 211 is fitted in the folded portion 111a to be positioned. The second portion 115 of the core material 110 is led out to the outside of the cavity 210 via the seal portion 212.

  In a next step (not shown), resin is press-fitted into the cavity 210 after mold matching, and as shown in FIG. 3, the handle part 10 and the cover part 112 of the core material 110 covered by the handle part 10 are integrally formed. It As a result, the base body 130 including the handle portion 10 and the core material 110 is configured.

  In the next step shown in FIG. 3, the bristle material 120 is sandwiched between the metal wire rods 111 of the untwisted second portion 115 of the core material 110, and the neck portion of the second portion 115 is fixed by the chuck 300. By twisting the portion 115, the twisted portion 113 holding the bristle material 120 is formed as shown in FIG.

  When the twisted portion 113 is concentrically bent into a spiral shape by 180 ° or more, as shown in FIG. 5, the oral care brush 1 in which the core material 110 is not exposed to the outside is completed. Since the core material 110 is not exposed to the outside, a safe and comfortable feeling of use can be obtained.

  In this embodiment, the bristle material 120 is composed of filaments formed in series in a coil shape. The filament may be a twisted yarn or a monofilament. The bristle material 120 does not fall off from the core material 110 even if a strong force is applied during use, and can be used safely.

  The bristles 120 may be comprised of a number of short wires, such as the conventional twist brush shown in FIG. The bristles 120 made of short wire rods are arranged between the metal wire rods 111 in a direction orthogonal to the axis of the metal wire rods 111 and the metal wire rods 111 are twisted, so that the bristle members 120 are helically arranged and held by the twisting portion 100. You can If this is subjected to concentric bending, a safe oral care brush 1 in which the core material 110 is not exposed to the outside is completed.

1 Oral Care Brush 10 Handle Part 100 Brush Part 110 Core Material 111 Metal Wire Material 111a Folding Part 111b Parallel Wire Part 112 Covering Part 113 Twisting Part 114 First Part 115 Second Part 120 Bristle Material 130 Base Material 200 Mold 210 Cavity 211 Pin 212 Seal part 300 Chuck

Claims (7)

A handle portion made of a resin material,
It is provided with a brush part joined to the handle part so that the care operation in the oral cavity can be performed by inserting it into the oral cavity,
The brush portion includes a core material made of a plurality of metal wires, and a bristle material held by the core material,
The core material is a method of manufacturing an oral care brush including a coating portion coated on the handle portion and a twisting portion holding a bristle material between the plurality of metal wire rods,
The first portion to be the covering portion of the core member is inserted and fixed in a mold for injection-molding the handle portion, and the metal wire rod to be the twisted portion of the core member is not twisted. A first step of arranging a second part of the so as to protrude from the mold;
The handle portion and the core material are formed by injecting the molten resin material into the mold to integrally form the handle portion and the cover portion of the core material coated on the handle portion. A second step of forming a substrate,
The twisted portion holding the bristle material is formed by sandwiching the bristle material between the untwisted second portions of the plurality of metal wire rods of the base and twisting the second portion. The method for producing an oral care brush, comprising:   By winding the twisted portion holding the hair material formed in the third step in a spiral shape by 180 ° or more, the hair material is densely formed on the center side of the spiral and forms a spiral portion that spreads radially outward. The method for manufacturing an oral care brush according to claim 1, further comprising a fourth step of:   The method for manufacturing an oral care brush according to claim 1, wherein the plurality of metal wires forming the core material are bent at one end on the covering portion side and are continuous with each other.   The method for manufacturing an oral care brush according to claim 1, wherein the plurality of metal wires forming the core material are twisted together in the covering portion.   The brush for oral care according to any one of claims 1 to 4, wherein the bristle material is substantially linear and is arranged with its axis line substantially orthogonal to the axis line of the metal wire material. Manufacturing method.   The said bristle material is formed in coil shape, and it is arrange | positioned so that any of the said metal wire rods may be penetrated inside it, The manufacturing of the brush for oral care in any one of Claim 1 thru | or 5 characterized by the above-mentioned. Method.   An oral care brush produced by the method according to claim 1.

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