JP2000079624A - Production of two-color molded article and its molded article - Google Patents
Production of two-color molded article and its molded articleInfo
- Publication number
- JP2000079624A JP2000079624A JP25126698A JP25126698A JP2000079624A JP 2000079624 A JP2000079624 A JP 2000079624A JP 25126698 A JP25126698 A JP 25126698A JP 25126698 A JP25126698 A JP 25126698A JP 2000079624 A JP2000079624 A JP 2000079624A
- Authority
- JP
- Japan
- Prior art keywords
- molded body
- primary
- resin material
- molding
- primary molded
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/16—Making multilayered or multicoloured articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/42—Brushes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/42—Brushes
- B29L2031/425—Toothbrush
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Brushes (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、複数の合成樹脂材
から成形された多色成形品、例えば歯ブラシハンドル等
を一次成形体に二次成形体を被覆して一体化する二色成
形品の製品のバリ発生を防止した製造方法およびその成
形品に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a two-color molded product formed by molding a plurality of synthetic resin materials, such as a toothbrush handle, which is formed by coating a primary molded product with a secondary molded product and integrating the molded product. The present invention relates to a production method for preventing generation of burrs on a product and a molded product thereof.
【０００２】[0002]
【従来の技術】従来、多色成形では合成樹脂材同士の一
体化成形で成形品とすることが主流であったが、近年商
品の多様化によって合成樹脂材と熱可塑性エラストマ材
との異種材料の一体化成形も様々な分野で行われるよう
になって来た。この異種材料での多色成形のうちの二次
成形では、合成樹脂材からなる一次成形体を成形したの
ちに、次に熱可塑性エラストマ材からなる二次成形体を
成形することになるが、一次成形体は二次成形体を成形
する成形金型内に配置されて、キャビティの一部として
使用されて、これに熱可塑性エラストマ材を溶融して充
填して二次成形体を成形することが知られている。2. Description of the Related Art Conventionally, in multicolor molding, it has been common to form a molded product by integrally molding synthetic resin materials. However, in recent years, with the diversification of products, different types of materials such as synthetic resin materials and thermoplastic elastomer materials have been used. Has also been performed in various fields. In the secondary molding of the multicolor molding with different materials, after molding a primary molded body made of a synthetic resin material, a secondary molded body made of a thermoplastic elastomer material is then molded, The primary molded body is placed in a molding die for molding the secondary molded body, and is used as a part of the cavity, and the thermoplastic elastomer material is melted and filled into this to form the secondary molded body. It has been known.
【０００３】[0003]
【発明が解決しようとする課題】ところが、この二次成
形体となる熱可塑性エラストマ材を溶融して合成樹脂材
からなる一次成形体と一体化する場合、熱可塑性エラス
トマ材が射出成形金型の隙間に入り込み、バリの発生で
成形不良を生じる問題があった。即ち、二色成形の場
合、二次成形時には成形金型に彫られたキャビティの空
間内に一次成形体を挿入し、この一次成形体は合成樹脂
でできているために、成形後の収縮等により、通常の射
出成形金型に比べて、寸法誤差が大きく、また充填され
る材料の圧力によって、キャビティ内部で動いてしまう
ので、成形金型との間に隙間が生じ易く、加えて、熱可
塑性エラストマ材は粘度の剪断速度依存性が大きく成形
プロセスの管理が難しいために、二次成形体が成形金型
と一次成形体との隙間に入り込みバリが生じ易くて不良
品となる問題があった。特に、成形品の形状が三次元曲
線で構成されて複雑化していたり、多数個取りの成形金
型を使って成形する場合には、一次成形品と、該一次成
形体が挿入される二次成形体の成形金型キャビティ寸法
との調整が難しくなるので、バリ止めが難しかった。However, when the thermoplastic elastomer material serving as the secondary molded body is melted and integrated with the primary molded body made of a synthetic resin material, the thermoplastic elastomer material is used in the injection molding die. There is a problem in that it enters the gap and causes molding defects due to generation of burrs. That is, in the case of two-color molding, during the secondary molding, the primary molded body is inserted into the space of the cavity engraved in the molding die, and since the primary molded body is made of synthetic resin, shrinkage after molding, etc. As a result, as compared with a normal injection mold, a dimensional error is large, and since the material is moved inside the cavity due to the pressure of the material to be filled, a gap is easily generated between the mold and the mold. Since the plastic elastomer material has a high viscosity dependence on the shear rate and it is difficult to control the molding process, the secondary molded product enters the gap between the molding die and the primary molded product, and tends to generate burrs, resulting in a defective product. Was. In particular, when the shape of a molded product is complicated by being formed by a three-dimensional curve, or when molding is performed using a multi-cavity molding die, a primary molded product and a secondary product into which the primary molded body is inserted are inserted. Since it is difficult to adjust the size of the molding die cavity, it is difficult to prevent burrs.
【０００４】また、こうした多色成形品は、ハンドルな
どのような手で握った時のグリップ感を良くすることを
目的として成形されることが多いが、バリが出てしまう
と手で握った時に違和感を与えてしまうばかりでなく、
外観上も品位が落ちるといった問題があった。さらに、
バリが生じない様に射出圧力や樹脂温度を下げた成形条
件では、一次成形体と二次成形体との端部が剥がれ易く
なったり、外観上ヒケが目立つようになる問題もあっ
た。しかも、従来の二色成形方法においては、図７の如
く、二次成形体ｂとなる溶融樹脂が成形金型のキャビテ
ィ部ｄに充填させる際に成形金型との間に隙間ｄ１があ
るとバリ発生となるし、図８（ａ）（ｂ）に示すように
このバリを避けるためには、一次成形体ａ上の二次成形
体ｂは、単純なデザイン形状にすることが余儀なくされ
てデザイン上の制約を受けることとなり、特に成形金型
の分割部分でありパーティングラインの箇所は、段差が
生じ易く成形品を握った時に違和感を与えるので、熱可
塑性エラストマ材で被覆するのが望ましいが、この部分
は図９のように多様、複雑なデザインを採用すると溶融
樹脂流れ方向に対向して突出する湾曲外縁部にはバリｃ
が出やすいため、熱可塑性エラストマ材での被覆を避け
る傾向があり、加えて、バリが出ると成形金型の磨耗が
促進され、金型寿命を短くする問題もあった。本発明
は、これら従来の諸問題点を解決しようとするもので、
熱可塑性エラストマ材を用いた二色成形で成形体が多様
なデザイン形態でも、異種材の表面接合縁部にバリの発
生がなく、確実に一体成形でき、しかもバリの出やすい
箇所に熱可塑性エラストマ材を設けない設計上の制約を
も設けることなく、外観上のヒケもない高品位感のある
二色成形品を提供することを目的とするものである。[0004] Further, such a multi-color molded product is often molded for the purpose of improving the grip feeling when gripped with a hand such as a handle. However, when a burr comes out, it is gripped with a hand. Not only does it sometimes give you discomfort,
There was a problem that the quality also deteriorated in appearance. further,
Under molding conditions in which the injection pressure and the resin temperature are reduced so as not to cause burrs, there have been problems that the ends of the primary molded product and the secondary molded product are easily peeled off, and that sink marks become noticeable in appearance. Moreover, in the conventional two-color molding method, as shown in FIG. 7, there is a gap d 1 between the molding die when the molten resin as a secondary molded body b is to fill the cavity portion d of the molding die In order to avoid such burrs as shown in FIGS. 8A and 8B, the secondary molded body b on the primary molded body a must have a simple design shape. In particular, the parting line of the molding die and the parting line are likely to have steps and give a sense of incongruity when gripping the molded product.Therefore, it is necessary to cover the part with a thermoplastic elastomer material. Although it is desirable that this portion adopts a diverse and complicated design as shown in FIG.
Therefore, there is a tendency that coating with a thermoplastic elastomer material is avoided, and in addition, when burrs appear, abrasion of a molding die is promoted and there is a problem that the life of the die is shortened. The present invention seeks to solve these conventional problems,
Even in a variety of design forms with two-color molding using a thermoplastic elastomer material, burrs do not occur on the surface joining edge of different materials, it can be integrally molded reliably, and the thermoplastic elastomer is applied to places where burrs are likely to appear It is an object of the present invention to provide a two-color molded product having a high-quality feeling without sink marks on the appearance without providing any design restriction without providing any material.
【０００５】[0005]
【課題を解決するための手段】本発明は、これら従来の
問題点に鑑みてなされたものであり、請求項１に記載の
発明にかかる製造方法は、一次樹脂材を用いて射出成形
により成形された一次成形体を、熱可塑性エラストマ材
からなる二次樹脂材で二次成形体を成形して二色成形品
とする時に、溶融した二次樹脂材が充填される成形金型
キャビティの所定位置に前記一次成形体を挿入して二色
成形を行う方法であって、前記一次成形体と二次成形体
との表面接合縁部の少なくとも一箇所に、二次成形時の
溶融樹脂流れ方向に対向して突出する流線型の湾曲外縁
部を有し、この表面接合縁部における一次成形体の端縁
部肉厚を先端に向って、除々に減少する鋭形の薄肉片に
形成し、該一次成形体を二次成形体用の二次成形金型内
に配置して、熱可塑性エラストマ材からなる二次樹脂材
によって二次成形体を一次成形体と一体成形し、さらに
二次成形体の二次樹脂材が溶融状態で二次成形金型内に
充填され流動して行く時に、流動樹脂先端部の溶融樹脂
が前記薄肉片を二次成形金型に押し付けて成形金型に充
填されるようにしたものである。DISCLOSURE OF THE INVENTION The present invention has been made in view of these conventional problems, and a manufacturing method according to the first aspect of the present invention is directed to molding by injection molding using a primary resin material. When the formed primary molded body is formed into a two-color molded product by molding a secondary molded body with a secondary resin material made of a thermoplastic elastomer material, a predetermined mold cavity is filled with the molten secondary resin material. A method of performing two-color molding by inserting the primary molded body at a position, at least at one portion of a surface joining edge of the primary molded body and the secondary molded body, a molten resin flow direction at the time of secondary molding. A streamlined curved outer edge protruding in opposition to the surface joining edge, the edge of the primary molded body at the surface joining edge is formed into a sharp thin piece gradually decreasing toward the front end, Place the primary compact in the secondary molding die for secondary The secondary molded body is integrally formed with the primary molded body by the secondary resin material made of the conductive elastomer material, and the secondary resin material of the secondary molded body is filled into the secondary molding die in a molten state and flows. Sometimes, the molten resin at the leading end of the flowing resin presses the thin piece against a secondary molding die to fill the molding die.
【０００６】請求項３に記載の発明にかかる二色成形品
では、一次樹脂材から成形された一次成形体と、該一次
成形体の一箇所または複数箇所の表面を被覆する二次樹
脂材からなる二次成形体とを有し、一次成形体の二次成
形体との表面接合縁部の両端部が流線型の湾曲外縁部を
有し、該湾曲外縁部の肉厚を先端に向って除々に減少す
る鋭形の薄肉片とし、該薄肉片を熱可塑性エラストマ材
からなる二次樹脂材によって成形される二次成形体で被
覆保持して一体化してなるものである。In the two-color molded product according to the third aspect of the present invention, a primary molded article molded from a primary resin material and a secondary resin material covering one or more surfaces of the primary molded article are used. And the both ends of the surface joining edge of the primary molded body with the secondary molded body have a streamlined curved outer edge, and the thickness of the curved outer edge gradually increases toward the tip. It is made into a sharp thin piece which is reduced in number, and the thin piece is covered with a secondary molded body formed of a secondary resin material made of a thermoplastic elastomer material and held and integrated.
【０００７】[0007]
【作用】本発明の二色成形品の製造方法によれば、一次
成形体と二次成形体との表面接合縁部における一次成形
体の端縁部肉厚が先細りの鋭形（肉厚を先端に向って除
々に減少する先細り状）の薄肉片を設けたので、二次成
形体となる二次樹脂材の充填圧力によって、二次成形金
型に張り付く方向に押されて、一次成形体と二次成形金
型との間に隙間を生じることがなく、隙間に樹脂材が入
り込んでバリとなることがない。また、一次成形体は、
二次成形体との表面接合縁部に先端先細りの鋭形の薄肉
片を設けたので、一次成形体と二次成形体の接触面積が
多くなり、しかも一次成形体の薄肉片の下部に二次成形
体がもぐり込む形となって接合するので、二次成形体が
一次成形体から剥がれることもなく、さらに成形品にバ
リ発生がないので、デザイン上の制約を受けないで高品
位の成形品にでき、かつ成形金型の磨耗も防げて成形金
型の寿命を長く維持できる。According to the method for producing a two-color molded article of the present invention, the thickness of the edge of the primary molded body at the surface joining edge of the primary molded body and the secondary molded body is tapered and sharp (the thickness is reduced). Since the tapered thin piece which gradually decreases toward the tip is provided, the primary molded body is pressed in a direction of sticking to the secondary molding die by the filling pressure of the secondary resin material to be the secondary molded body. There is no gap between the mold and the secondary molding die, and the resin material does not enter the gap to form burrs. Also, the primary molded body is
A sharp thin-walled piece with a tapered tip is provided at the surface joining edge with the secondary molded body, so that the contact area between the primary molded body and the secondary molded body is increased. Since the secondary molded body is in the form of being recessed and joined, the secondary molded body does not peel off from the primary molded body and there is no burr on the molded product, so high quality molded products without restriction on design And the wear of the molding die can be prevented, so that the life of the molding die can be maintained long.
【０００８】[0008]
【発明の実施の形態】以下に本発明の実施の形態を、表
面の一部に熱可塑性エラストマ材が被覆された歯ブラシ
ハンドルを成形する例で、図面を用いて説明する。本発
明の実施形態である歯ブラシハンドル１では、主要部と
なる一次成形体２の外表部に、二次成形体３が部分的に
被覆され一体化している。（図１） 前記一次成形体２は、前記歯ブラシハンドル１の主要部
である植毛部２１ 、首部２２ 、ハンドル部２３ の一
部を形成していて、一次成形体２と二次成形体３との表
面接合縁部の少なくとも一箇所に二次成形時の溶融樹脂
流れ方向に対向して突出する流線型の湾曲外縁部２４
を有し、該湾曲外縁部２４ における一次成形体２の端
縁部肉厚を先端に向って除々に減少する鋭形の薄肉片２
５ に形成している（図２および図３）。そして、この
一次成形体２のハンドル部２３ を中央部として首部２
２ から端部にかけて熱可塑性エラストマ材の二次成形
体３をハンドル部２３ の表面の一部を覆うように形成
される。本実施例では、成形金型の分割面であるパーテ
ィングライン１１にも二次成形体３が被覆されている場
合の例であるが、二次成形体３の被覆の形態は、デザイ
ンや機能によって種々の形態に選ぶことができる。DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings, using an example of forming a toothbrush handle having a part of its surface coated with a thermoplastic elastomer material. In a toothbrush handle 1 according to an embodiment of the present invention, a secondary molded body 3 is partially covered and integrated with an outer surface of a primary molded body 2 which is a main part. (Figure 1) the primary molded body 2, said a major portion flocked portion 2 1 of the toothbrush handle 1, neck 2 2, form part of the handle portion 2 3, the primary molded body 2 and the secondary molding body 3 and streamlined curved outer edge 2 4 on at least one portion of a surface joint edge portion projecting to face the molten resin flow direction at the time of secondary molding of the
The a, the curved outer edge 2 4 toward the tip end edge thickness of the primary molded body 2 in the acute forms which gradually decreases thin piece 2
5 (FIGS. 2 and 3). Then, the neck portion 2 of the handle part 2 3 of the primary molded body 2 as a central unit
It is formed from 2 to the end of the secondary molded body 3 of a thermoplastic elastomeric material so as to cover a portion of the handle portion 2 3 surfaces. The present embodiment is an example in which the parting line 11 which is a dividing surface of the molding die is also covered with the secondary molded body 3. Can be selected in various forms.
【０００９】本発明のような一次成形体２と二次成形体
３との二色成形法或いは多色成形法は、一個または複数
個の金型を使って、射出成形を複数回行うことによって
行われるが、一番簡単な二色成形方法について説明を行
うと、先ず、一次樹脂材で一次成形体２が例えば、図４
に例示されたように配置された複数の樹脂充填用キャビ
ティ１０を有する一次成形金型２０を用いて通常の射出
成形により成形される。この一次成形体２は、ポリプロ
ピレン、ポリカーボネート、ナイロン、ポリエチレンテ
レフタレート、ポリブチレンテレフタレート、アクリ
ル、スチレン等の一次合成樹脂材を用いて成形される。
詳しくは一次樹脂材としては、ポリオレフィン（ポリプ
ロピレン、ポリエチレン等）、ポリエステル（ポリエチ
レンテレフタレート、ポリブチレンテレフタレート
等）、ポリカーボネート（ポリエステルとのブレンドを
含む）、ポリアリレート（ポリエステルとのブレンドを
含む）、ポリオキシメチンレン、ＡＳ樹脂、ＡＢＳ樹
脂、セルロースプロピオネート、ポリアミド、ＰＭＭＡ
樹脂などの材料を用いることができる。In the two-color molding method or the multi-color molding method of the primary molded body 2 and the secondary molded body 3 according to the present invention, injection molding is performed a plurality of times using one or a plurality of dies. Although the simplest two-color molding method will be described, first, the primary molded body 2 is made of a primary resin material, for example, as shown in FIG.
Is molded by ordinary injection molding using a primary molding die 20 having a plurality of resin filling cavities 10 arranged as illustrated in FIG. The primary molded body 2 is molded using a primary synthetic resin material such as polypropylene, polycarbonate, nylon, polyethylene terephthalate, polybutylene terephthalate, acrylic, and styrene.
Specifically, as the primary resin material, polyolefin (polypropylene, polyethylene, etc.), polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polycarbonate (including a blend with polyester), polyarylate (including a blend with polyester), polyoxy Methylene, AS resin, ABS resin, cellulose propionate, polyamide, PMMA
A material such as a resin can be used.
【００１０】また、前記二次成形体３は、図５に示す如
き二次成形金型３０を用いて、成形されるが、該二次成
形金型３０のパーティング面３１のある可動金型３２と
固定金型３３との間に形成されたキャビティ部３４内
に、前記一次成形体２をインサートして、該キャビティ
部３４に熱可塑性エラストマ材からなる二次樹脂材を充
填して、二次成形体を一次成形体２と一体成形する。The secondary molding 3 is molded by using a secondary molding die 30 as shown in FIG. 5, and a movable die having a parting surface 31 of the secondary molding die 30. The primary molded body 2 is inserted into a cavity 34 formed between the mold 32 and the fixed mold 33, and the cavity 34 is filled with a secondary resin material made of a thermoplastic elastomer material. The next formed body is integrally formed with the first formed body 2.
【００１１】この場合、前記可動金型３２内に配置され
た一次成形体２は、該一次成形体２に形成された穴部
４，４１ を二次成形金型３０に設置された突部（図示
せず）に嵌合させる等により、二次成形金型３０内に保
持される。二次成形体３を射出成形をするに当たって
は、可動金型３２と固定金型３３が射出成形機により型
締めされて、分離していた２つの両金型３２，３３を閉
じて一体化する。この時一次成形体２は、金型の彫り込
み部と共に二次成形体３を充填するための空間部分の側
壁部分となる。次に、二次成形体３となる二次樹脂材が
溶融状態で射出成形機のノズル３５から、二次成形金型
３０に設けたスプルー３６やランナー３７とからなる流
路を通り、成形品の外観等を考慮して適当な任意の位置
に設けられたゲート３８の注入口から、キャビティ部３
４内に充填されて二次成形体３が成形される。[0011] In this case, the primary molded body 2 disposed on the movable mold 32 is installed a projection hole portions 4, 4 1 formed in the primary molded body 2 to the secondary molding die 30 (Not shown), and is held in the secondary molding die 30. In performing the injection molding of the secondary molded body 3, the movable mold 32 and the fixed mold 33 are clamped by an injection molding machine, and the two separated molds 32, 33 are closed and integrated. . At this time, the primary molded body 2 becomes a side wall portion of a space portion for filling the secondary molded body 3 together with the engraved portion of the mold. Next, when the secondary resin material to be the secondary molded body 3 is in a molten state, the molded product passes from the nozzle 35 of the injection molding machine through the flow path including the sprue 36 and the runner 37 provided in the secondary molding die 30. From the injection port of the gate 38 provided at an appropriate position in consideration of the appearance of the
4, and the secondary molded body 3 is formed.
【００１２】なお、前記二次成形体３の二次樹脂材とし
ては、前記二次成形金型３０のキャビティ部３４に配置
された一次成形体２との相溶性を考慮して選択されたポ
リオレフィン系、ポリアミド系、ポリスチレン系、ポリ
ウレタン系あるいはポリエステル系等の熱可塑性エラス
トマ材が用いられる。さらに、詳しくは熱可塑性エラス
トマ材としては、ポリオレフィン系ＴＰＥ（ＴＰＥ：熱
可塑性エラストマ）、ポリスチレン系ＴＰＥ、ポリウレ
タン系ＴＰＥ、ポリエステル系ＴＰＥ、１，２−ポリブ
タジエン系ＴＰＥ、エチレン−酢酸ビニル系ＴＰＥ、ポ
リ塩化ビニル系ＴＰＥ、天然ゴム系ＴＰＥ、フッ素系ゴ
ムＴＰＥ、トランス−ポリイソプレン系ＴＰＥなど様々
なＴＰＥを用いることができる。実際のハンドルは、こ
れらの一次材料と二次材料を適宜組み合わせて用いる
が、歯ブラシハンドルの場合には、歯ブラシ用材料とし
て求められる物性・価格や相互の相溶性を考慮して、ポ
リプロピレンとポリオレフィン系ＴＰＥを用いることが
好ましい。例えば、ポリオレフィン系ＴＰＥは、ゴム成
分としてＥＰＤＭ（エチレン−プロピレン−ジエン３元
共重合体）、硬成分としてポリプロピレンを選び、これ
らをブレンドし一部あるいは全部を架橋したものが用い
られる。そして、溶融状態で充填された熱可塑性エラス
トマ材は、一次成形体２との接合部で熱融着し一体化さ
れる。次で、成形品は二次成形金型３０内で冷却された
後、型開きが行われパーティング面３１を境に可動金型
３２が固定金型３３から後退するが、この時成形品は可
動金型３２に付着していて、成形品は突き出しピン３９
の作動によって二次成形金型３０内から離型される。The secondary resin material of the secondary molding 3 is a polyolefin selected in consideration of the compatibility with the primary molding 2 disposed in the cavity 34 of the secondary molding die 30. A thermoplastic elastomer material such as a thermoplastic elastomer, a polyamide, a polystyrene, a polyurethane or a polyester is used. More specifically, examples of the thermoplastic elastomer material include polyolefin-based TPE (TPE: thermoplastic elastomer), polystyrene-based TPE, polyurethane-based TPE, polyester-based TPE, 1,2-polybutadiene-based TPE, ethylene-vinyl acetate-based TPE, and polystyrene-based TPE. Various TPEs such as a vinyl chloride-based TPE, a natural rubber-based TPE, a fluorine-based rubber TPE, and a trans-polyisoprene-based TPE can be used. The actual handle is used by appropriately combining the primary material and the secondary material.In the case of a toothbrush handle, considering the physical properties and price required for the material for the toothbrush and mutual compatibility, polypropylene and polyolefin-based materials are used. It is preferable to use TPE. For example, as the polyolefin-based TPE, one obtained by selecting EPDM (ethylene-propylene-diene terpolymer) as a rubber component and polypropylene as a hard component, blending them, and partially or entirely cross-linking them is used. Then, the thermoplastic elastomer material filled in a molten state is heat-sealed and integrated at the joint with the primary molded body 2. Next, after the molded article is cooled in the secondary molding mold 30, the mold is opened, and the movable mold 32 retreats from the fixed mold 33 with the parting surface 31 as a boundary. The molded product is attached to the movable mold 32,
Is released from the inside of the secondary molding die 30.
【００１３】図１に示す歯ブラシハンドル１において
は、一次成形体２と二次成形体３とで、ハンドル部２
３ が熱可塑性樹脂材（一次樹脂材）と熱可塑性エラス
トマ材（二次樹脂材）からなる二色成形をされたハンド
ルとなり、該ハンドルの少なくとも握り部で、一次樹脂
材の断面形状を、植毛部２１ の毛面を有する側に向け
て開口する略Ｕ字状形状に構成し、単なる横長の長方形
断面や、中央に接続部があるＨ形状の断面のものと比較
して、ブラッシングに伴う下方への曲げに対して力学的
強度を維持しながら一次樹脂材の断面積を少なくし、握
り部内（指あて部）でも充分に撓むようにすると共に、
当該開口部の一部にハンドル表裏を貫通する貫通孔の穴
部４，４１ を設けて、射出成形時に二次樹脂材がハン
ドル表裏ともにバランス良く流れるようにし、しかも前
記二次樹脂材が一次樹脂材の全周にわたって被覆する様
に構成し、製品形状の握り部断面において一次樹脂材の
比率を減らして弾力を得ると同時に、どんな方向で指を
当てても二次樹脂材に触れるため、刷掃時に手指が滑ら
ないようにしかつ、ハンドル美麗化を図ったものであ
る。In the toothbrush handle 1 shown in FIG. 1, the primary molded body 2 and the secondary molded body 3 form a handle 2
Numeral 3 designates a two-color molded handle made of a thermoplastic resin material (primary resin material) and a thermoplastic elastomer material (secondary resin material). parts towards the side constitute a substantially U-shape that opens with a 2 1 hair surface, of rectangular cross-section and merely Horizontal, compared to that of the cross section of H shape with a connection portion in the center, due to brushing While maintaining the mechanical strength against downward bending, reduce the cross-sectional area of the primary resin material, and bend it sufficiently even in the grip part (finger rest),
A hole 4, 4 1 of the through hole penetrating the handle sides in a part of the opening is provided, the secondary resin during injection molding to flow well balanced in both the front and rear handle, yet the secondary resin material primary In order to obtain elasticity by reducing the ratio of primary resin material in the grip section of the product shape, at the same time as touching the secondary resin material in any direction, The hand is prevented from slipping during brushing and the handle is beautiful.
【００１４】特に、図１乃至図３に示す例の前記一次成
形体２のハンドル部２３ では、前記二次成形体３が被
覆される端部に流線型の湾曲外縁部２４ があり、その
先端部が鋭形の薄肉片２５ が４箇所設けられている
が、この先端部が鋭形の薄肉片２５ の数は、熱可塑性
エラストマ材からなる二次成形体３を一次成形体２に、
どの様に被覆配置するかのデザインによって適宜決めら
れるものである。なお、鋭形の薄肉片２５ の寸法は、
成形品の寸法にもよるが、付け根の厚さが０．５ｍｍ〜
３．０ｍｍで、先端部の角度θは５゜〜３０゜好ましく
は１０゜〜２０゜が望ましい。この様に一次成形体２に
形成された先端部が鋭形の薄肉片２５ は、図６（ａ）
に示す様に二次成形体３を成形する時に二次樹脂材の圧
力によって、二次成形金型３０との間の隙間２３をなく
す方向に押されるので、バリのない成形体を容易に得る
ことができる。[0014] In particular, the handle part 2 3 of the primary molded body 2 of the embodiment shown in FIGS. 1 to 3, there is streamlined curved outer edge 2 4 of the end portion to which the secondary shaped body 3 is coated, the Four thin pieces 25 each having an acute tip are provided. The number of the thin pieces 25 each having an acute tip is determined by changing the secondary molded body 3 made of a thermoplastic elastomer material into the primary molded body 2. To
It is appropriately determined by the design of how to arrange the coating. In addition, the dimension of the sharp thin piece 25 is
The thickness of the base is 0.5mm ~
3.0 mm, and the angle θ of the tip is 5 ° to 30 °, preferably 10 ° to 20 °. The thin-walled piece 25 having a sharp tip portion formed on the primary molded body 2 in this manner is shown in FIG.
As shown in (2), when the secondary molded body 3 is molded, it is pushed by the pressure of the secondary resin material in a direction to eliminate the gap 23 between the secondary molded body 30 and the molded body without burr is easily obtained. be able to.
【００１５】この場合、バリ止め効果をさらに高めるた
めには、図６（ｂ）に示した一次成形体の中心線を挟ん
で対称の位置にある一対の切先状（鋭形）の薄肉片２
５ の幅寸法Ｗ１を、二次成形体３を成形するために一
次成形体２が保持される二次成形金型３０の幅寸法Ｗ２
よりも僅かに大きくすることが有効である。これは、先
端部が鋭形の薄肉片２５は、成形金型で締め付けられて
先端部の浮き上がりが防止されるので、前述した先端部
が鋭形の薄肉片２５ を押さえつける樹脂の圧力との相
乗効果で、バリ防止効果が大きくなるからである。な
お、Ｗ１とＷ２の差は、一次成形体の弾性によって無理
に金型に押し込める範囲によって定められる。通常は
０．０１ｍｍ〜０．１ｍｍに設定される。In this case, in order to further enhance the burr-stopping effect, a pair of cutting-edge (sharp) thin pieces located symmetrically with respect to the center line of the primary molded body shown in FIG. 2
5 is changed to the width W2 of the secondary molding die 30 that holds the primary molded body 2 for molding the secondary molded body 3.
It is effective to make it slightly larger than that. This thin strip 2 5 sharpness shaped tip, so clamped molding die lifting of the front end portion is prevented, and the pressure of the resin for pressing the thin piece 2 5 sharpness shaped tip described above This is because the synergistic effect increases the burr prevention effect. The difference between W1 and W2 is determined by the range that can be forced into the mold due to the elasticity of the primary molded body. Usually, it is set to 0.01 mm to 0.1 mm.
【００１６】即ち、図６（ａ）（ｂ）に示す如く、溶融
樹脂が二次成形金型３０に充填される際に、充填樹脂先
端部が、薄肉片２５ の先端部を二次成形金型３０のキ
ャビティ部３４に押さえ付けながら充填していくので、
一次成形体２の先端部が鋭形の薄肉片２５ は成形金型
３０との間に隙間２３を生じることがなく、通常はバリ
の原因となる樹脂圧を逆に利用して成形金型との隙間２
３を防ぐので、そこに樹脂が流れ込んで、バリが生じな
いようになる。また、前記一次成形体２と二次成形体３
との表面接合縁部の全周にわたってアリ溝状の凹溝２６
を形成して溶融樹脂の流動をしやすくすると共に、端
部が剥がれないようにすることもできる。That is, as shown in FIGS. 6 (a) and 6 (b), when the molten resin is charged into the secondary molding die 30, the tip of the filled resin is formed by the secondary molding of the tip of the thin piece 25. Filling while pressing down the cavity part 34 of the mold 30,
The thin-walled piece 25 having a sharp tip at the tip of the primary molded body 2 does not form a gap 23 with the molding die 30, and usually uses the resin pressure which causes burrs in reverse to form the molding die. Gap 2 with
3 prevents the resin from flowing into it, thereby preventing burrs. Further, the primary molded body 2 and the secondary molded body 3
Dovetail groove 26 over the entire periphery of the surface joining edge
Is formed to facilitate the flow of the molten resin and to prevent the end portions from peeling off.
【００１７】なお、この実施形態では、一次成形体２と
二次成形体３と別々の成形金型および成形機を使って成
形する例で説明したが、ロータリー式の二色射出成形機
および、スライド等の機構により２つの成形体を交互に
成形可能な金型を使って連続成形することも可能である
ことは言うまでもなく、この連続成形の場合にもバリ止
め効果が発揮され、これらの製造方法によって得られる
成形品は、二次成形体である熱可塑性エラストマ樹脂材
が一次成形体に回り込むことがなく、外観品位も高品位
で、グリップ感が良好な製品が得られる。In this embodiment, an example has been described in which the primary molding 2 and the secondary molding 3 are molded using separate molding dies and molding machines. However, a rotary two-color injection molding machine and Needless to say, continuous molding can be performed using a mold that can alternately mold the two molded bodies by a mechanism such as a slide. In the molded product obtained by the method, a thermoplastic elastomer resin material as a secondary molded product does not wrap around the primary molded product, and a product having a high appearance quality and a good grip feeling can be obtained.
【００１８】また、前記一次成形体２には二次成形体３
との一体化を強化するために貫通した穴部４，４
１ や、文字、符号、記号等の表示部５を設けて商品価
値を高めることが考慮される。例えば、グリップ感を高
めるため手のひら（パームグリップ）で握った時の刷掃
を考慮して、握り部のハンドル部２３ から植毛部２
１ にかけての弾力と、実際に刷掃したときのハンドル
弾力の感じ方が極めて良い使用感とが得られるような弾
力に設定する。さらに、一次成形体２の二次成形金型３
０内での位置決めのための位置決め凸部、例えば模様、
ダイヤ、ハートの図形形状などの凸部６を突設し、二次
成形体３の表面上に表われた形態で埋設し外観品位を高
めることが配慮される。The primary molded body 2 includes a secondary molded body 3
Holes 4, 4 penetrated to enhance integration with
It is considered to provide a display unit 5 such as 1 or a character, a sign, a symbol, or the like to increase the commercial value. For example, in view of the brushing when gripped by the palm (palm grip) to enhance the grip, flocked portion 2 from the handle portion 2 3 handgrip
The elasticity is set so that the elasticity toward 1 and the feeling of the handle elasticity when actually brushed can be obtained with an extremely good feeling of use. Furthermore, the secondary molding die 3 of the primary molded body 2
Positioning protrusions for positioning within 0, for example, patterns,
It is considered that a convex portion 6 such as a diamond or heart shape is protruded and buried in a form shown on the surface of the secondary molded body 3 to enhance the appearance quality.
【００１９】前記二次成形体３の外観も首部２２ に近
接して蛇腹形状部３１ や指あて部（図示せず）を必要
に応じ形成することもできるが、歯ブラシハンドル１の
握り部となるハンドル部２３ と首部２２ との境界付
近の全周が熱可塑性エラストマ材で被覆され、刷掃時の
手指の滑りを防止することが考慮されている。また、実
施形態の歯ブラシハンドル１としては、ハンドル表面側
（植毛面側）の一次樹脂材がハンドル長軸方向にわたっ
て湾曲縁面を形成した凹状部に構成し、さらに一次樹脂
材の断面積を減らしてブラッシング時の弾力を得ると共
に、その部分に被覆されている二次樹脂材で形成される
面（製品形状）と平行でない形状であるようにして、二
次樹脂材の歯ブラシ外観デザイン形状に関係なく充分な
弾力を付与してあり、また、首部の握り部側の一部も、
一次樹脂材の断面積を少なくし、二次樹脂材で全周にわ
たって被覆した構成とすることによって、首部でも弾力
を付与し、撓んだ時の応力を握り部と首部の両方へ応力
分散して、より安全な設計としてある。[0019] While the secondary appearance of the molded body 3 also in close proximity to the neck 2 2 bellows portion 3 1 and the finger addressed unit (not shown) may also be a necessary form, handle portion of the toothbrush handle 1 the entire circumference in the vicinity of the boundary between the handle part 2 3 and a neck 2 2 to be coated with a thermoplastic elastomer material, to prevent slipping of the fingers of the printing掃時are considered. Further, in the toothbrush handle 1 of the embodiment, the primary resin material on the handle surface side (flocked surface side) is configured as a concave portion having a curved edge surface extending in the longitudinal direction of the handle, and further reduces the cross-sectional area of the primary resin material. To obtain the elasticity at the time of brushing, and to make the shape not parallel to the surface (product shape) formed by the secondary resin material coated on the part, so that the shape is related to the toothbrush appearance design shape of the secondary resin material. Without giving enough elasticity, and also a part of the grip on the side of the neck,
By reducing the cross-sectional area of the primary resin material and covering the entire circumference with the secondary resin material, elasticity is also imparted to the neck, and the stress when flexing is distributed to both the grip and the neck. And as a more secure design.
【００２０】[0020]
【実施例】以下この発明の実施例を示す。 実施例１ 一次成形体は、図４のようなキャビティが複数加工され
た一次成形金型と、図５に示したようなスクリュウ径６
３ｍｍ、型締力３００トンの射出成形機および取り出し
設備を用いて、ポリプロピレンプロピレンを原材料とし
て、次のような成形条件下で成形した。 （ａ）シリンダー温度 １８０〜２２５℃ （ｂ）金型温度 ３０〜６０℃ （ｃ）射出圧力 ９００〜１，２００ｋｇｆ／ｃｍ２ ここで成形された一次成形体は、一次成形金型から取り
出され一定時間の冷却がなされる。次に、二次成形体の
成形は、一次成形体を成形したと同様の射出成形機を用
いて、先に成形され一定時間の冷却がなされた一次成形
体を、図５に示した様に二次成形体を成形する二次成形
金型内に挿入して、この二次成形金型を一次成形体を内
部に包含したまま型締めして、ポリオレフィン系エラス
トマ材を原料として二次成形体が次の条件で成形され
る。 （ｄ）シリンダー温度 １８０〜２２０℃ （ｅ）金型温度 ３０〜６０℃ （ｆ）射出圧力 ５５０〜８００ｋｇｆ／ｃｍ２ この実施例の一次成形体と二次成形体との一体成形の成
形品は、二次成形体が一次成形体の表面に回り込むこと
がなく、バリ発生を防ぎ外観品位に優れ、しかも多様な
デザイン形態を容易に採用することができ、設計の自由
度を大幅に広げ得る。Embodiments of the present invention will be described below. Example 1 A primary molding was a primary molding die in which a plurality of cavities were machined as shown in FIG. 4 and a screw diameter 6 as shown in FIG.
Molding was performed using polypropylene propylene as a raw material under the following molding conditions using an injection molding machine and a removal facility with a 3 mm mold clamping force of 300 tons. (A) Cylinder temperature 180 to 225 ° C (b) Mold temperature 30 to 60 ° C (c) Injection pressure 900 to 1,200 kgf / cm 2 The primary molded product molded here is taken out from the primary molding die and fixed. Time cooling is provided. Next, the secondary molded body was molded using the same injection molding machine as that used to mold the primary molded body, and the primary molded body that had been previously molded and cooled for a certain period of time was formed as shown in FIG. The secondary molding is inserted into a secondary molding die for molding, and the secondary molding die is clamped while the primary molding is contained therein, and the secondary molding is formed using a polyolefin elastomer material as a raw material. Is formed under the following conditions. (D) Cylinder temperature 180-220 ° C. (e) Mold temperature 30-60 ° C. (f) Injection pressure 550-800 kgf / cm 2 A molded article of the primary molded article and the secondary molded article of this embodiment is integrally molded. In addition, the secondary molded body does not wrap around the surface of the primary molded body, prevents the generation of burrs, is excellent in appearance quality, and can easily adopt various design forms, thereby greatly expanding the design freedom.
【００２１】[0021]
【発明の効果】本発明は、一次成形体と二次成形体との
表面接合縁部の少なくとも一箇所に、二次成形時の溶融
樹脂流れ方向に対向して突出する流線型の湾曲外縁部を
有し、この表面接合縁部における一次成形体の端縁部肉
厚を先端に向って、除々に減少する鋭形の薄肉片に形成
し、該一次成形体を二次成形体用の二次成形金型内に配
置して、熱可塑性エラストマ材の二次樹脂材によって二
次成形体を一次成形体と一体成形することで、一次成形
体と二次成形体との一体成形品が多様なデザイン形態で
も表面接合縁部において、二次成形体が一次成形体の表
面に回り込みバリとなることを防ぐことができるので、
グリップ感の良好な成形体を得ることができると共に、
バリ止め効果により、バリの出やすい箇所には、熱可塑
性エラストマ材部を設けないと言った設計上の制約を受
けることなく、多様なデザインを忠実に表現できる成形
体とすることができるし、バリ発生がないので成形金型
の磨耗を防止でき、成形金型の寿命も長くできて、低コ
ストの成形品とすることができる。また、一次成形体に
形成される先端部が鋭形の薄肉片によって一次成形体と
二次成形体との接合力を増すことができて、二次成形体
が一次成形体から剥がれることなく、使用感を著しく良
好にし、しかも、外観上のヒケもない高品位多色成形品
を製造することができる。また、一次成形体の二次成形
体との表面接合縁部の少なくとも一端部が流線型の湾曲
外縁部を有し、外該湾曲該縁部の肉厚を先端に向って除
々に減少する鋭形の薄肉片とし、該薄肉片を熱可塑性エ
ラストマ材の二次樹脂材によって成形される二次成形体
で被覆保持して一体化してなることで、一次成形体表面
に二次成形体が回り込んでバリとなることがなく、外観
品位の優れた商品価値の高い多色成形品を提供すること
ができる。According to the present invention, a streamlined curved outer edge protruding in the molten resin flow direction at the time of secondary molding is provided at at least one of the surface joining edges of the primary molded body and the secondary molded body. The thickness of the edge of the primary molded body at the surface joining edge is gradually reduced toward the tip to form a sharp thin piece, and the primary molded body is formed into a secondary molded body secondary part. By arranging in a molding die and integrally molding the secondary molded body with the primary molded body with the secondary resin material of the thermoplastic elastomer material, the integrally molded product of the primary molded body and the secondary molded body is various. Even in the design form, at the surface joining edge, it is possible to prevent the secondary molded body from going around the surface of the primary molded body and forming burrs,
A molded article with a good grip feeling can be obtained,
Due to the deburring effect, it is possible to make a molded body that can faithfully represent various designs without being restricted by the design that a thermoplastic elastomer material part is not provided in places where burrs are likely to appear, Since there is no burr, the wear of the molding die can be prevented, the life of the molding die can be prolonged, and a low-cost molded product can be obtained. Also, the tip formed on the primary molded body can increase the joining force between the primary molded body and the secondary molded body by the sharp thin piece, without the secondary molded body peeling from the primary molded body, It is possible to produce a high-quality multicolor molded article having a remarkably good feeling in use and having no sink mark in appearance. In addition, at least one end of the surface joining edge of the primary molded body with the secondary molded body has a streamlined curved outer edge, and the thickness of the curved outer edge gradually decreases toward the tip. By forming the thin piece into a thin piece and covering and holding the thin piece with a secondary molded body formed of a secondary resin material of a thermoplastic elastomer material, the secondary molded body wraps around the surface of the primary molded body Thus, it is possible to provide a multicolor molded product having excellent appearance quality and high commercial value without causing burrs.
【図１】本発明の実施例の二色成形品を示し、（ａ）は
その平面図、（ｂ）は側面図である。FIG. 1 shows a two-color molded product according to an embodiment of the present invention, wherein (a) is a plan view and (b) is a side view.
【図２】図１の例の一次成形体の平面図である。FIG. 2 is a plan view of a primary molded body of the example of FIG.
【図３】図２の例の一次成形体の一部拡大して示し、
（ａ）はその平面図、（ｂ）はその側面図、（ｃ）はｃ
−ｃ線における縦断面図、（ｄ）はＡ部の拡大説明図で
ある。FIG. 3 is a partially enlarged view of the primary molded body of the example of FIG. 2,
(A) is its plan view, (b) is its side view, (c) is c
FIG. 4D is a vertical sectional view taken along line c, and FIG.
【図４】図２の例の一次成形体の一次成形金型の平面図
である。FIG. 4 is a plan view of a primary molding die of the primary molded body of the example of FIG. 2;
【図５】本発明に係わる一次成形体を二次成形体の二次
成形金型に配置した状態の縦断面図である。FIG. 5 is a longitudinal sectional view showing a state in which a primary molded body according to the present invention is arranged in a secondary molding die of a secondary molded body.
【図６】本発明の二次樹脂材の充填状態を示す成形金型
内の模式図で、（ａ）はその縦断面図、（ｂ）は金型と
一次成形体との分離状態の平面図である。FIGS. 6A and 6B are schematic views of the inside of a molding die showing a filling state of a secondary resin material of the present invention, wherein FIG. 6A is a longitudinal sectional view thereof, and FIG. FIG.
【図７】従来の二次樹脂材の充填状態を示す成形金型内
の模式図である。FIG. 7 is a schematic view of the inside of a molding die showing the state of filling of a conventional secondary resin material.
【図８】従来のバリ発生防止の成形品を示し、（ａ）は
その平面図、（ｂ）は側面図である。8A and 8B show a conventional molded product for preventing burr generation, in which FIG. 8A is a plan view and FIG. 8B is a side view.
【図９】従来成形方法を用いた場合の成形品の側面図で
ある。FIG. 9 is a side view of a molded product when a conventional molding method is used.
【符号の説明】 １ 歯ブラシハンドル ２ 一次成形体 ２１ 植毛部 ２２ 首部 ２３ ハンドル部 ２４ 湾曲外縁部 ２５ 薄肉片 ２６ 凹溝 ３ 二次成形体 ３１ 蛇腹形状部 ４，４１ 穴部 ５ 表示部 ６ 位置決め凸部 １０ キャビティ １１ パーティングライン ２０ 一次成形金型 ３０ 二次成形金型 ３１ パーティング面 ３２ 可動金型 ３３ 固定金型 ３４ キャビティ部 ３５ ノズル ３６ スプルー ３７ ランナー ３８ ゲート ３９ 突き出しピン[Description of Signs] 1 Toothbrush handle 2 Primary molded body 2 1 Flocked part 2 2 Neck 2 3 Handle part 2 4 Curved outer edge 2 5 Thin piece 2 6 Concave groove 3 Secondary molded body 3 1 Bellows-shaped part 4, 4 1 Hole part 5 Display part 6 Positioning convex part 10 Cavity 11 Parting line 20 Primary molding die 30 Secondary molding die 31 Parting surface 32 Movable die 33 Fixed die 34 Cavity part 35 Nozzle 36 Sprue 37 Runner 38 Gate 39 Protruding pin
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.7 識別記号 ＦＩ テーマコート゛(参考） Ｂ２９Ｌ 31:00 Ｆターム(参考） 3B202 AA06 AB15 AB19 CA02 CA05 4F202 AA03 AA13 AA24 AA28 AA45 AH81 AM33 CA11 CB01 CB12 CB27 CK41 CK89 4F206 AA03 AA13 AA24 AA28 AA45 AH81 AM33 JA07 JB12 JB25 JF05 JN12 JQ81 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 7 Identification symbol FI Theme coat ゛ (Reference) B29L 31:00 F term (Reference) 3B202 AA06 AB15 AB19 CA02 CA05 4F202 AA03 AA13 AA24 AA28 AA45 AH81 AM33 CA11 CB01 CB12 CB27 CK41 CK89 4F206 AA03 AA13 AA24 AA28 AA45 AH81 AM33 JA07 JB12 JB25 JF05 JN12 JQ81
Claims (4)
一箇所または複数箇所の表面を被覆する二次樹脂材から
成形された二次成形体を一体成形する二色成形品の製造
方法であって、前記一次成形体と二次成形体との表面接
合縁部の少なくとも一箇所に、二次成形時の溶融樹脂流
れ方向に対向して突出する流線型の湾曲外縁部を有し、
この表面接合縁部における一次成形体の端縁部肉厚を先
端に向って、除々に減少する鋭形の薄肉片に形成し、該
一次成形体を二次成形体用の二次成形金型内に配置し
て、熱可塑性エラストマ材の二次樹脂材によって二次成
形体を一次成形体と一体成形することを特徴とする二色
成形品の製造方法。1. A method for manufacturing a two-color molded article, comprising integrally molding a secondary molded body formed from a secondary resin material covering one or more surfaces of a primary molded body molded from a primary resin material. At least one of the surface joining edges of the primary molded body and the secondary molded body has a streamlined curved outer edge projecting in the direction of the molten resin flow during the secondary molding,
The thickness of the edge portion of the primary molded body at the surface joining edge is gradually reduced toward the tip to form a sharp thin piece, and the primary molded body is a secondary molding die for a secondary molded body. Wherein the secondary molded body is integrally formed with the primary molded body using a secondary resin material of a thermoplastic elastomer material.
形金型内において、熱可塑性エラストマ材で二次成形体
を成形する際に、該二次成形体の熱可塑性エラストマ材
が溶融状態で二次成形金型内に充填流動時に流動先端部
の溶融樹脂材が、前記一次成形体に形成された薄肉片を
二次成形金型に押し付けて二次成形金型内のキャビティ
に充填されることを特徴とする請求項１記載の二色成形
品の製造方法。2. When the secondary molded body is molded from a thermoplastic elastomer material in a secondary molding die for the secondary molded body, the thermoplastic elastomer material of the secondary molded body is At the time of filling and flowing into the secondary molding die in a molten state, the molten resin material at the leading end of the flow presses the thin piece formed on the primary molded body against the secondary molding die to form a cavity in the secondary molding die. The method for producing a two-color molded product according to claim 1, wherein the molded product is filled.
と、該一次成形体の一箇所または複数箇所の表面を被覆
する二次樹脂材からなる二次成形体とを有し、一次成形
体の二次成形体との表面接合縁部の両端部が流線型の湾
曲外縁部を有し、該湾曲外縁部の肉厚を先端に向って除
々に減少する鋭形の薄肉片とし、該薄肉片を熱可塑性エ
ラストマ材の二次合成樹脂材によって成形される二次成
形体で被覆保持して一体化してなる二色成形品。3. A primary molded article comprising: a primary molded article molded from a primary resin material; and a secondary molded article made of a secondary resin material covering one or more surfaces of the primary molded article. The both ends of the surface joining edge portion with the secondary molded body have a streamlined curved outer edge portion, and the thickness of the curved outer edge portion is gradually reduced toward the tip to be an acute thin thin piece; A two-color molded product obtained by coating and holding a secondary molded body formed of a secondary synthetic resin material made of a thermoplastic elastomer material.
びハンドル部を有する棒状体であって、熱可塑性エラス
トマ材で首部とハンドル部との境界付近の外周面を略蛇
腹形状部のある二次成形体で被覆一体化してなることを
特徴とする請求項３に記載の二色成形品。4. The primary molded body is a rod-shaped body having a head portion, a neck portion, and a handle portion, wherein the outer peripheral surface near the boundary between the neck portion and the handle portion is made of a thermoplastic elastomer material. The two-color molded product according to claim 3, wherein the two-color molded product is coated and integrated with a next molded product.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25126698A JP2000079624A (en) | 1998-09-04 | 1998-09-04 | Production of two-color molded article and its molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP25126698A JP2000079624A (en) | 1998-09-04 | 1998-09-04 | Production of two-color molded article and its molded article |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000079624A true JP2000079624A (en) | 2000-03-21 |
Family
ID=17220238
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP25126698A Pending JP2000079624A (en) | 1998-09-04 | 1998-09-04 | Production of two-color molded article and its molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000079624A (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003265232A (en) * | 2002-03-19 | 2003-09-24 | Sunstar Inc | Tooth brush |
| JP2005261462A (en) * | 2004-03-16 | 2005-09-29 | Sanyo Electric Co Ltd | Electric toothbrush |
| JP2006500258A (en) * | 2002-09-27 | 2006-01-05 | トリサ ホールディング エージー | Toothbrush manufacturing method |
| JP2007190439A (en) * | 2007-04-27 | 2007-08-02 | Kao Corp | Toothbrush |
| JP2008044320A (en) * | 2006-08-21 | 2008-02-28 | Toppan Printing Co Ltd | Coating material for rubber-coated polypropylene molding |
| JP2009190308A (en) * | 2008-02-15 | 2009-08-27 | Sansho Kk | Two-color molded product |
| KR20180036692A (en) * | 2015-06-08 | 2018-04-09 | 글락소스미스클라인 컨슈머 헬스케어 (유케이) 아이피 리미티드 | Oral cleaning device with a tool adapted for removing denture adhesive from dentures |
-
1998
- 1998-09-04 JP JP25126698A patent/JP2000079624A/en active Pending
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003265232A (en) * | 2002-03-19 | 2003-09-24 | Sunstar Inc | Tooth brush |
| JP2006500258A (en) * | 2002-09-27 | 2006-01-05 | トリサ ホールディング エージー | Toothbrush manufacturing method |
| JP4671150B2 (en) * | 2002-09-27 | 2011-04-13 | トリサ ホールディング エージー | Toothbrush manufacturing method |
| JP2005261462A (en) * | 2004-03-16 | 2005-09-29 | Sanyo Electric Co Ltd | Electric toothbrush |
| JP2008044320A (en) * | 2006-08-21 | 2008-02-28 | Toppan Printing Co Ltd | Coating material for rubber-coated polypropylene molding |
| JP2007190439A (en) * | 2007-04-27 | 2007-08-02 | Kao Corp | Toothbrush |
| JP4628394B2 (en) * | 2007-04-27 | 2011-02-09 | 花王株式会社 | toothbrush |
| JP2009190308A (en) * | 2008-02-15 | 2009-08-27 | Sansho Kk | Two-color molded product |
| KR20180036692A (en) * | 2015-06-08 | 2018-04-09 | 글락소스미스클라인 컨슈머 헬스케어 (유케이) 아이피 리미티드 | Oral cleaning device with a tool adapted for removing denture adhesive from dentures |
| JP2021151493A (en) * | 2015-06-08 | 2021-09-30 | グラクソスミスクライン コンシューマー ヘルスケア（ユーケー） アイピー リミテッド | Oral cleaning implement with tool adapted for removal of denture adhesive from dentures |
| KR102348645B1 (en) | 2015-06-08 | 2022-01-06 | 글락소스미스클라인 컨슈머 헬스케어 (유케이) 아이피 리미티드 | Oral irrigation implement with tool adapted to remove denture adhesive from dentures |
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