JP4666587B2 - Toothbrush handle molding method - Google Patents

Toothbrush handle molding method Download PDF

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JP4666587B2
JP4666587B2 JP2005042931A JP2005042931A JP4666587B2 JP 4666587 B2 JP4666587 B2 JP 4666587B2 JP 2005042931 A JP2005042931 A JP 2005042931A JP 2005042931 A JP2005042931 A JP 2005042931A JP 4666587 B2 JP4666587 B2 JP 4666587B2
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resin
transparent
elastomer
mold
transparent resin
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JP2006224547A (en
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博文 森若
晴臣 榎本
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Kao Corp
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    • 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
    • B29C45/1642—Making multilayered or multicoloured articles having a "sandwich" structure
    • 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

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Brushes (AREA)
  • Injection Moulding Of Plastics Or The Like (AREA)

Description

本発明は、グラデーション成形方法及び成形体に関する。ここで、グラデーションとは、色濃度や色調、光沢がある規則性によって変化することをいう。   The present invention relates to a gradation molding method and a molded body. Here, gradation refers to changing according to regularity with color density, color tone, and gloss.

従来、グラデーション成形方法として、サンドイッチ成形用ノズルを用いたものがある（特許文献１）。   Conventionally, there is a gradation molding method using a sandwich molding nozzle (Patent Document 1).

また、成形体の成形後に塗装等の加飾を施すことにより、成形体の外観にグラデーションを形成するものもある。   In addition, there are some that form a gradation in the appearance of a molded body by applying decoration such as painting after the molded body is molded.

インサート成形により、透明樹脂の外側にエラストマーを配置した成形体もある。
特開2004-114482 There is also a molded body in which an elastomer is disposed outside the transparent resin by insert molding.
JP2004-114482

従来技術には以下の問題点がある。
(1)成形体の成形後に塗装等の加飾を施すものにあっては、生産工程が増加し、高コストになる。 The prior art has the following problems.
(1) In the case of decorating the molded body after molding, the production process is increased and the cost is increased.

(2)インサート成形により透明樹脂の外側にエラストマーを配置した成形体では、一次成形品たる透明樹脂の温度が低い等により、透明樹脂とエラストマーとの接着性が悪く、エラストマーが透明樹脂から剥離するおそれがある。また、透明樹脂を成形する１次成形とエラストマーを成形する２次成形の複数の成形工程を有するため、高コストになる。   (2) In a molded body in which an elastomer is arranged outside the transparent resin by insert molding, the adhesiveness between the transparent resin and the elastomer is poor due to the low temperature of the transparent resin, which is the primary molded product, and the elastomer peels from the transparent resin. There is a fear. Moreover, since it has the several shaping | molding process of the primary shaping | molding which shape | molds transparent resin, and the secondary shaping | molding which shape | molds an elastomer, it becomes high cost.

本発明の課題は、着色樹脂と透明又は半透明の樹脂からなる成形体の外観に簡易にグラデーションを形成することにある。   The subject of this invention is forming a gradation easily in the external appearance of the molded object which consists of colored resin and transparent or translucent resin.

本発明の他の課題は、エラストマーと透明又は半透明の樹脂からなる成形体の外観に簡易にグラデーションを形成するとともに、両樹脂の接着性を向上することにある。   Another object of the present invention is to easily form a gradation on the appearance of a molded article made of an elastomer and a transparent or translucent resin and to improve the adhesiveness of both resins.

請求項１の発明は、最初に着色樹脂を金型のゲートから射出し、次に着色樹脂の射出停止後に透明又は半透明の樹脂を金型のゲートから着色樹脂の内部に射出し、透明又は半透明の樹脂が着色樹脂の流動末端を突き破って該金型の奥側にまで延在するとともに、着色樹脂を突き破った透明又は半透明の樹脂が着色樹脂の流動末端の外側に回り込みするグラデーションが形成された歯ブラシ用ハンドルの成形方法であって、上記透明又は半透明の樹脂が外側に回り込みするグラデーションが形成される部分の断面形状が円形であるようにしたものである。 In the invention of claim 1, the colored resin is first injected from the gate of the mold, and then after the injection of the colored resin is stopped, the transparent or translucent resin is injected from the gate of the mold into the colored resin. There is a gradation in which the translucent resin penetrates the flow end of the colored resin and extends to the back side of the mold, and the transparent or translucent resin that broke through the color resin wraps around the flow end of the colored resin. A method for forming a formed toothbrush handle is such that a cross-sectional shape of a portion where a gradation in which the transparent or translucent resin wraps around is formed is circular .

請求項３の発明は、最初にエラストマーを金型のゲートから該金型の中間部にまで射出し、次にエラストマーの射出停止後に透明又は半透明の樹脂を金型のゲートからエラストマーの内部に射出し、透明又は半透明の樹脂がエラストマーの流動末端を突き破って該金型の奥側にまで延在するとともに、エラストマーを突き破った透明又は半透明の樹脂がエラストマーの流動末端の外側に回り込みするグラデーションが形成された歯ブラシ用ハンドルの成形方法であって、上記透明又は半透明の樹脂が外側に回り込みするグラデーションが形成される部分の断面形状が円形であるようにしたものである。 In the invention of claim 3 , the elastomer is first injected from the mold gate to the middle part of the mold, and then the transparent or translucent resin is injected from the mold gate to the inside of the elastomer after the injection of the elastomer is stopped. When injected, the transparent or translucent resin breaks through the flow end of the elastomer and extends to the back side of the mold, and the transparent or translucent resin that breaks through the elastomer wraps around the flow end of the elastomer. A method for forming a handle for a toothbrush in which gradation is formed, wherein a cross-sectional shape of a portion where a gradation is formed in which the transparent or translucent resin wraps around to the outside is circular.

ここで、透明又は半透明とは、内部が目視できれば良く、有色の透明であっても良い。   Here, transparent or translucent means that the inside can be visually confirmed, and it may be colored and transparent.

（実施例１）（図１〜図３）
図１〜図３は、歯ブラシ用ハンドルたる成形体１０を、サンドイッチ射出成形法により射出成形金型１を用いて、下記(1)、(2)の如くに成形する手順を示すものである。ここでサンドイッチ射出成形法とは、２種以上の材料を使用して、１組の金型に対して、その金型の同一のゲートから、２組の射出機構を交互に切り替えたり、２組の射出機構をともに制御することによって材料を射出し、成形する方法である。 Example 1 (FIGS. 1 to 3)
1 to 3 show a procedure for molding a molded body 10 serving as a toothbrush handle using the injection mold 1 by the sandwich injection molding method as shown in the following (1) and (2). Here, the sandwich injection molding method uses two or more kinds of materials, and alternately switches two sets of injection mechanisms from the same gate of the mold to one set of molds. This is a method for injecting and molding a material by controlling both of the injection mechanisms.

(1)着色樹脂１１（成形体１０の最も金型１のゲート１Ａ寄りで最外周に出したい樹脂）を金型１のゲート１Ａから金型１の中間部にまで射出する（図１（Ａ））。着色樹脂１１は、例えばポリエチレンテレフタレート（ＰＥＴ）、ポリスチレン（ＰＳ）、アクリルニトリルスチレン（ＡＳ）、ポリアクリル（ＰＭＭＡ）、又はポリプロピレン（ＰＰ）に着色剤を加えたものを採用できる。   (1) A colored resin 11 (resin that is desired to be put out on the outermost periphery of the molded body 10 closest to the gate 1A of the mold 1) is injected from the gate 1A of the mold 1 to the middle portion of the mold 1 (FIG. 1A )). As the colored resin 11, for example, polyethylene terephthalate (PET), polystyrene (PS), acrylonitrile styrene (AS), polyacryl (PMMA), or polypropylene (PP) added with a colorant can be employed.

(2)上述(1)の着色樹脂１１の射出停止後、透明樹脂（半透明樹脂でも可）１２（成形体１０の着色樹脂１１より流動末端側で外周に出る樹脂）を金型１のゲート１Ａから着色樹脂１１の内部に射出する。透明樹脂１２は着色樹脂１１の流動末端を突き破って金型１の最奥部にまで延在する（図１（Ｂ）、（Ｃ））。   (2) After stopping the injection of the colored resin 11 of the above (1), a transparent resin (or a translucent resin) 12 (resin that comes out on the flow end side from the colored resin 11 of the molded body 10) is placed on the gate of the mold 1 The resin is injected into the colored resin 11 from 1A. The transparent resin 12 breaks through the flow end of the colored resin 11 and extends to the innermost part of the mold 1 (FIGS. 1B and 1C).

透明樹脂１２は、例えばポリエチレンテレフタレート（ＰＥＴ）、ポリスチレン（ＰＳ）、アクリルニトリルスチレン（ＡＳ）、ポリアクリル（ＰＭＭＡ）、又はポリプロピレン（ＰＰ）を採用できる。   As the transparent resin 12, for example, polyethylene terephthalate (PET), polystyrene (PS), acrylonitrile styrene (AS), polyacryl (PMMA), or polypropylene (PP) can be employed.

このとき、金型１内でゲート１Ａ寄りの着色樹脂１１は、透明樹脂１２により金型１の内面に押付けられ（図２）、それよりも流動末端側では、着色樹脂１１を突き破った透明樹脂１２が着色樹脂１１の流動末端の外側に回り込んで金型１の内面に転写する（図３）。   At this time, the colored resin 11 near the gate 1A in the mold 1 is pressed against the inner surface of the mold 1 by the transparent resin 12 (FIG. 2), and the transparent resin that has broken through the colored resin 11 on the flow end side. 12 moves to the outside of the flow end of the colored resin 11 and is transferred to the inner surface of the mold 1 (FIG. 3).

これにより、着色樹脂１１と透明樹脂１２からなる成形体１０が形成される。成形体１０は、透明樹脂１２が着色樹脂１１の内部からその流動末端を突き破ってなり、着色樹脂１１を突き破った透明樹脂１２が着色樹脂１１の末端の外側に回り込む。透明樹脂１２が突き破った着色樹脂１１の流動末端は、金型１の奥側に向けて長くかつ薄く尖がるように引き伸ばされてその色濃度、色調、光沢を漸次的に淡くする。   Thereby, the molded object 10 which consists of the colored resin 11 and the transparent resin 12 is formed. In the molded body 10, the transparent resin 12 breaks through the flow end from the inside of the colored resin 11, and the transparent resin 12 that breaks through the colored resin 11 wraps around the outside of the end of the colored resin 11. The flow end of the colored resin 11 pierced by the transparent resin 12 is elongated toward the back side of the mold 1 so as to be long and thin, and the color density, color tone, and gloss gradually become lighter.

成形体１０にあっては、上述(1)、(2)の着色樹脂１１の射出終了タイミングと透明樹脂１２の射出開始タイミングを適宜変更することにより、着色樹脂１１と透明樹脂１２の分布形状、特に着色樹脂１１の流動末端の形状、ひいては成形体１０のグラデーション外観を調整できる。   In the molded body 10, the distribution shape of the colored resin 11 and the transparent resin 12 is appropriately changed by appropriately changing the injection end timing of the colored resin 11 and the injection start timing of the transparent resin 12 in the above (1) and (2). In particular, the shape of the flow end of the colored resin 11 and the gradation appearance of the molded body 10 can be adjusted.

尚、着色樹脂１１は、透明樹脂１２に着色剤を加えたものに限らず、透明樹脂１２と異材質のものでも良い。また、透明樹脂１２は有色の透明であっても良く、その色は着色樹脂１１の色と異なっていても同じでも良い。   The colored resin 11 is not limited to the transparent resin 12 added with a colorant, and may be made of a material different from that of the transparent resin 12. The transparent resin 12 may be colored and transparent, and the color may be different from or the same as the color of the colored resin 11.

本実施例によれば以下の作用効果を奏する。
(a)成形体１０を構成する着色樹脂１１の内部に透明樹脂１２（又は半透明樹脂１２）を射出し、透明樹脂１２により着色樹脂１１の末端を突き破り、着色樹脂１１を突き破った透明樹脂１２が着色樹脂１１の末端の外側に回り込む。従って、成形体１０の基端側を着色樹脂１１にて形成し、先端側を透明樹脂１２にて形成し、基端側と先端側の中間で透明樹脂１２が着色樹脂１１の外側に回り込んだ部分を基端側から先端側に向けて色濃度を漸次的に淡くする色調の変化を得ることができる。従って、成形体１０の外観にグラデーションを形成できる。 According to the present embodiment, the following operational effects can be obtained.
(a) The transparent resin 12 (or translucent resin 12) is injected into the colored resin 11 constituting the molded body 10, the end of the colored resin 11 is pierced by the transparent resin 12, and the transparent resin 12 is broken through the colored resin 11. Wraps around the outside of the end of the colored resin 11. Accordingly, the base end side of the molded body 10 is formed with the colored resin 11, the tip end side is formed with the transparent resin 12, and the transparent resin 12 wraps around the outside of the color resin 11 between the base end side and the tip end side. It is possible to obtain a change in color tone that gradually decreases the color density from the base end side toward the front end side. Therefore, gradation can be formed on the appearance of the molded body 10.

(b)１台の成形機と１台の金型１を用い、着色樹脂１１と透明樹脂１２の射出パターンを調整するだけで、成形体１０の外観に任意のグラデーションを形成でき、簡易である。   (b) By simply adjusting the injection pattern of the colored resin 11 and the transparent resin 12 using one molding machine and one mold 1, an arbitrary gradation can be formed on the appearance of the molded body 10, and it is simple. .

(c)成形体１０の外観でグラデーションを表すためには、透明樹脂１２の全光線透過率（光透過度）を10％以上95％以下とすることが好ましい。この全光線透過率を20％以上、更には30％以上にすることにより、透明樹脂１２の透明度を増し、グラデーション外観をより鮮明に美しくできる。 (c) In order to express gradation in the appearance of the molded body 10, it is preferable that the total light transmittance (light transmittance) of the transparent resin 12 is 10% or more and 95% or less. By making the total light transmittance 20% or more, further 30% or more, the transparency of the transparent resin 12 can be increased, and the gradation appearance can be made clearer and more beautiful.

（実施例２）（図４〜図６）
図４〜図６は、歯ブラシ用ハンドルたる成形体２０を、サンドイッチ射出成形法により射出成形金型１を用いて、下記(1)、(2)の如くに成形する手順を示すものである。ここでサンドイッチ射出成形法とは、２種以上の材料を使用して、１組の金型に対して、その金型の同一のゲートから、２組の射出機構を交互に切り替えたり、ともに制御することによって材料を射出し、成形する方法である。 Example 2 (FIGS. 4 to 6)
FIGS. 4 to 6 show the procedure for molding the molded body 20 as a toothbrush handle using the injection molding die 1 by the sandwich injection molding method as shown in the following (1) and (2). Here, the sandwich injection molding method uses two or more kinds of materials, and two sets of injection mechanisms are alternately switched or controlled for one set of molds from the same gate of the mold. In this way, the material is injected and molded.

(1)エラストマー２１（熱可塑性エラストマー）（成形体２０の最も金型１のゲート１Ａ寄りで最外周に出る）を金型１のゲート１Ａから金型１の中間部にまで射出する（図４（Ａ））。   (1) Elastomer 21 (thermoplastic elastomer) (exposed to the outermost periphery of the molded body 20 closest to the gate 1A of the mold 1) is injected from the gate 1A of the mold 1 to the middle portion of the mold 1 (FIG. 4). (A)).

(2)上述(1)のエラストマー２１の射出停止後、透明樹脂（半透明樹脂でも可）２２（成形体２０のエラストマー２１より流動末端側で外周に出る）を金型１のゲート１Ａからエラストマー２１の内部に射出する。透明樹脂２２はエラストマー２１の流動末端を突き破って金型１の最奥部にまで延在する（図４（Ｂ））。   (2) After stopping the injection of the elastomer 21 of the above (1), a transparent resin (or a translucent resin) 22 (exiting to the outer periphery on the flow end side from the elastomer 21 of the molded body 20) is passed through the gate 1A of the mold 1 21 is injected into the interior. The transparent resin 22 breaks through the flow end of the elastomer 21 and extends to the innermost part of the mold 1 (FIG. 4B).

透明樹脂２２は、例えばポリエチレンテレフタレート（ＰＥＴ）、ポリスチレン（ＰＳ）、アクリルニトリルスチレン（ＡＳ）、ポリアクリル（ＰＭＭＡ）、又はポリプロピレン（ＰＰ）を採用できる。   As the transparent resin 22, for example, polyethylene terephthalate (PET), polystyrene (PS), acrylonitrile styrene (AS), polyacryl (PMMA), or polypropylene (PP) can be employed.

このとき、金型１内でゲート１Ａ寄りのエラストマー２１は、透明樹脂２２により金型１の内面に押付けられ（図５）、それよりも流動末端側では、エラストマー２１を突き破った透明樹脂２２がエラストマー２１の流動末端の外側に回り込んで金型１の内面に転写する（図６）。   At this time, the elastomer 21 near the gate 1A in the mold 1 is pressed against the inner surface of the mold 1 by the transparent resin 22 (FIG. 5). It wraps around the outside of the fluid end of the elastomer 21 and transfers it to the inner surface of the mold 1 (FIG. 6).

これにより、エラストマー２１と透明樹脂２２からなる成形体２０が形成される。成形体２０は、透明樹脂２２がエラストマー２１の内部からその流動末端を突き破ってなり、エラストマー２１を突き破った透明樹脂２２がエラストマー２１の末端の外側に回り込む。透明樹脂２２が突き破ったエラストマー２１の流動末端は、金型１の奥側に向けて長くかつ薄く尖がるように引き伸ばされてその色濃度、色調、光沢を漸次的に淡くする。   As a result, a molded body 20 composed of the elastomer 21 and the transparent resin 22 is formed. In the molded body 20, the transparent resin 22 breaks through the flow end from the inside of the elastomer 21, and the transparent resin 22 that breaks through the elastomer 21 goes around the outside of the end of the elastomer 21. The fluid end of the elastomer 21 pierced by the transparent resin 22 is elongated toward the inner side of the mold 1 so as to be long and thin, and the color density, color tone, and gloss gradually become lighter.

成形体２０にあっては、上述(1)、(2)のエラストマー２１の射出終了タイミングと透明樹脂２２の射出開始タイミングを適宜変更することにより、エラストマー２１と透明樹脂２２の分布形状、特にエラストマー２１の流動末端の形状、ひいては成形体２０のグラデーション外観を調整できる。   In the molded body 20, the distribution shape of the elastomer 21 and the transparent resin 22, particularly the elastomer, is changed by appropriately changing the injection end timing of the elastomer 21 and the injection start timing of the transparent resin 22 in the above (1) and (2). It is possible to adjust the shape of the flow end 21 and the gradation appearance of the molded body 20.

尚、エラストマー２１は、透明樹脂２２は有色の透明であっても良く、その色はエラストマー２１の色と異なっていても同じでも良い。   The elastomer 21 may be transparent with the transparent resin 22 colored, and the color may be the same as or different from the color of the elastomer 21.

本実施例によれば以下の作用効果を奏する。   According to the present embodiment, the following operational effects can be obtained.

(a)成形体２０を構成するエラストマー２１の内部に透明（又は半透明樹脂２２）を射出し、透明樹脂２２によりエラストマー２１の末端を突き破り、エラストマー２１を突き破った透明樹脂２２がエラストマー２１の末端の外側に回り込む。従って、成形体２０の基端側をエラストマー２１にて形成し、先端側を透明樹脂２２にて形成し、基端側と先端側の中間で透明樹脂２２がエラストマー２１の外側に回り込んだ部分を基端側から先端側に向けて色濃度を漸次的に淡くする色調の変化を得ることができる。従って、成形体２０の外観にグラデーションを形成できる。 (a) A transparent (or translucent resin 22) is injected into the elastomer 21 constituting the molded body 20, the end of the elastomer 21 is pierced by the transparent resin 22, and the transparent resin 22 that has pierced the elastomer 21 is the end of the elastomer 21. Wrap around outside. Therefore, the base end side of the molded body 20 is formed of the elastomer 21, the tip end side is formed of the transparent resin 22, and the transparent resin 22 wraps around the outside of the elastomer 21 between the base end side and the tip end side. Thus, a change in color tone that gradually decreases the color density from the base end side toward the front end side can be obtained. Therefore, gradation can be formed on the appearance of the molded body 20.

(b)１台の成形機と１台の金型１を用い、エラストマー２１と透明樹脂２２の射出パターンを調整するだけで、成形体２０の外観に任意のグラデーションを形成でき、簡易である。   (b) By simply adjusting the injection pattern of the elastomer 21 and the transparent resin 22 using one molding machine and one mold 1, an arbitrary gradation can be formed on the appearance of the molded body 20, which is simple.

(c)１台の成形機と１個の金型１により、エラストマー２１と透明樹脂２２からなる成形体２０を成形でき、エラストマー２１と透明樹脂２２がともに高温下で同時成形されるから相互の接着力が高く、エラストマー２１の剥離を生じない。   (c) The molding body 20 made of the elastomer 21 and the transparent resin 22 can be molded by one molding machine and one mold 1, and both the elastomer 21 and the transparent resin 22 are simultaneously molded at a high temperature. The adhesive strength is high and the elastomer 21 does not peel off.

(d)１台の成形機と１個の金型１により、複数の成形工程を有することなくため、エラストマー２１と透明樹脂２２からなる成形体２０を低コストで成形できる。   (d) Since one molding machine and one mold 1 do not have a plurality of molding steps, the molded body 20 composed of the elastomer 21 and the transparent resin 22 can be molded at low cost.

(e)成形体２０が歯ブラシ用ハンドルであるとき、成形体２０の基端側の外周はエラストマー２１を外層にして滑り止め効果の高い握り部（図４（Ｂ）のＬ1）になり、口の中に入る先端部（図４（Ｂ）のＬ2）はエラストマー２１を内層にして唇に触れないようにすることができる。口腔内での使用等を忌避すべきエラストマー２１を握り部に用い、これを先端側では包むことによって衛生上の不都合を回避できる。   (e) When the molded body 20 is a toothbrush handle, the outer periphery on the proximal end side of the molded body 20 is a grip portion (L1 in FIG. 4B) having an elastomer 21 as an outer layer and having a high anti-slip effect. The tip portion (L2 in FIG. 4 (B)) entering the inside can be prevented from touching the lips with the elastomer 21 as an inner layer. Sanitary inconvenience can be avoided by using an elastomer 21 that should be avoided in the oral cavity for the grip portion and wrapping it at the tip side.

(f)成形体２０の外観でグラデーションを表すためには、透明樹脂２２の全光線透過率（光透過度）を10％以上95％以下とすることが好ましい。この全光線透過率を20％以上、更には30％以上にすることにより、透明樹脂２２の透明度を増し、グラデーション外観をより鮮明に美しくできる。 (f) In order to express gradation in the appearance of the molded body 20, it is preferable that the total light transmittance (light transmittance) of the transparent resin 22 is 10% or more and 95% or less. By setting the total light transmittance to 20% or more, further 30% or more, the transparency of the transparent resin 22 can be increased, and the gradation appearance can be made clearer and more beautiful.

尚、全光線透過率は、2mm厚みの平板を用い、JIS K7361-1測定法により測定する。   The total light transmittance is measured by a JIS K7361-1 measuring method using a 2 mm thick flat plate.

図１は実施例１の成形方法を示す模式図である。FIG. 1 is a schematic view showing a molding method of Example 1. FIG. 図２は図１のII−II線に沿う断面図である。FIG. 2 is a sectional view taken along line II-II in FIG. 図３は図１のIII−III線に沿う断面図である。FIG. 3 is a sectional view taken along line III-III in FIG. 図４は実施例２の成形方法を示す模式図である。FIG. 4 is a schematic view showing the molding method of Example 2. 図５は図４のV−V線に沿う断面図である。FIG. 5 is a cross-sectional view taken along line V-V in FIG. 図６は図４のVI−VI線に沿う断面図である。6 is a cross-sectional view taken along line VI-VI in FIG.

符号の説明Explanation of symbols

１ 金型
１Ａ ゲート
１０ 成形体
１１ 着色樹脂
１２ 透明樹脂
２０ 成形体
２１ エラストマー
２２ 透明樹脂 1 Mold 1A Gate 10 Molded body 11 Colored resin 12 Transparent resin 20 Molded body 21 Elastomer 22 Transparent resin

Claims (4)

最初に着色樹脂を金型のゲートから射出し、
次に着色樹脂の射出停止後に透明又は半透明の樹脂を金型のゲートから着色樹脂の内部に射出し、透明又は半透明の樹脂が着色樹脂の流動末端を突き破って該金型の奥側にまで延在するとともに、着色樹脂を突き破った透明又は半透明の樹脂が着色樹脂の流動末端の外側に回り込みするグラデーションが形成された歯ブラシ用ハンドルの成形方法であって、
上記透明又は半透明の樹脂が外側に回り込みするグラデーションが形成される部分の断面形状が円形である、歯ブラシ用ハンドルの成形方法。 First, the colored resin is injected from the gate of the mold,
Next, after the injection of the colored resin is stopped, the transparent or translucent resin is injected from the gate of the mold into the colored resin, and the transparent or translucent resin penetrates the flow end of the colored resin to the back of the mold. A method of forming a handle for a toothbrush in which a gradation is formed in which a transparent or translucent resin that has broken through the colored resin wraps around the outside of the flow end of the colored resin,
A method for forming a handle for a toothbrush, wherein a cross-sectional shape of a portion where a gradation in which the transparent or translucent resin wraps around is formed is circular. 前記透明又は半透明の樹脂の全光線透過率を10〜95％にする請求項１に記載の歯ブラシ用ハンドルの成形方法。   The method for molding a toothbrush handle according to claim 1, wherein the total light transmittance of the transparent or translucent resin is 10 to 95%. 最初にエラストマーを金型のゲートから該金型の中間部にまで射出し、
次にエラストマーの射出停止後に透明又は半透明の樹脂を金型のゲートからエラストマーの内部に射出し、透明又は半透明の樹脂がエラストマーの流動末端を突き破って該金型の奥側にまで延在するとともに、エラストマーを突き破った透明又は半透明の樹脂がエラストマーの流動末端の外側に回り込みするグラデーションが形成された歯ブラシ用ハンドルの成形方法であって、
上記透明又は半透明の樹脂が外側に回り込みするグラデーションが形成される部分の断面形状が円形である、歯ブラシ用ハンドルの成形方法。 First, the elastomer is injected from the mold gate to the middle of the mold,
Next, after the injection of the elastomer is stopped, a transparent or translucent resin is injected into the elastomer from the gate of the mold, and the transparent or translucent resin penetrates the flow end of the elastomer and extends to the back side of the mold. And a method of molding a handle for a toothbrush in which a gradation is formed in which a transparent or translucent resin that has penetrated the elastomer wraps around the outside of the fluid end of the elastomer,
A method for forming a handle for a toothbrush, wherein a cross-sectional shape of a portion where a gradation in which the transparent or translucent resin wraps around is formed is circular. 前記透明又は半透明の樹脂の全光線透過率を10〜95％にする請求項３に記載の歯ブラシ用ハンドルの成形方法。 The method for molding a toothbrush handle according to claim 3 , wherein the total light transmittance of the transparent or translucent resin is 10 to 95%.
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US8549691B2 (en) 2009-12-18 2013-10-08 Colgate-Palmolive Company Oral care implement having multi-component handle
EP3269272B1 (en) † 2009-12-18 2020-09-16 Colgate-Palmolive Company Oral care implement having multi-component handle
JP2013256085A (en) * 2012-06-14 2013-12-26 Mitsubishi Pencil Co Ltd Outer member of writing instrument
US9802347B2 (en) 2015-02-02 2017-10-31 Colgate-Palmolive Company Method of forming an oral care implement
USD777446S1 (en) 2015-07-23 2017-01-31 Colgate-Palmolive Company Oral care implement handle
JP2020000709A (en) * 2018-06-29 2020-01-09 サンスター株式会社 toothbrush

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