JPS5880586A - Production of plastic case for watch - Google Patents

Abstract

PURPOSE:To manufacture with higher productivity a portable plastic watch case having smaller hardening shrinkage and higher bending strength, by using elastic synthetic rubber as molds and casting therein to harden a mixture of heat- hardening casting synthetic resin and specific glass fibers. CONSTITUTION:Liquid synthetic rubber such as transparent silicone rubber, which has been defoamed under reduced pressure and has elasticity and transfer- printing ability, is cast into a container and a watch prototype 4 is placed at the center of the container. Then the liquid rubber is heated and hardened into synthetic rubber molds 3 and 3'. After the prototype 4 is taken out, casting resin, i.e., a mixture of sensitizer-treated spiran resin and a 60wt% of glass fiber, which has an aspect ratio of 10 or above and a length of 10mu or above and has been treated with acryl-based silane resin, is defoamed and poured into molds 3 and 3'. Then the casting resin is fixed securely at the top and bottom with glass plates 7 and heated to harden. Next, molds 3 and 3' are released and the formed plastic case is taken out. In this way, a plastic watch case can be manufactured with a less number of processes less time and more productivity than in other conventional methods.

Description

【発明の詳細な説明】 本発明は、加熱硬化による注型成型した腕時語など携帯
時計用プラスチックケースの製造方法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of manufacturing a plastic case for a portable watch, such as a watch case, which is cast-molded by heat curing.

こｎまでは、腕時計ケース材貞としてステンレスや鋼合
金が主流であった。従って、腕時計ケースの製作工程ｒ
ｉ型設網、プレス型製作、プレス打ちｌｉｉ［、鍛造、
切削、研轡、仕上げとわたり、数多くの１依が必要とな
っていた。又、衆知の通りプラスチック射出成形による
腕時計ケース製作は丁でに実用化さｎている。しかし射
出金型の製作時間が長いことや、少盪生産で切り換える
ので割り藺になっているなど問題点である。近年多品槌
少蝋生産体′制にエリ、激しく変化するニーズに合った
待ＶＣ個性的なデザインと流行にマツチした即応槽の製
品化が求望さｎている。そのような所から表作時の工ａ
　Ｆ５１Ｊ減が望ｉＴしてきた。Up until now, stainless steel and steel alloys have been the mainstream materials for wristwatch cases. Therefore, the manufacturing process of the watch case r
I-type netting, press mold production, press punching, forging,
Cutting, grinding, and finishing required numerous steps. Furthermore, as is well known, the manufacture of watch cases by plastic injection molding has just recently been put into practical use. However, there are problems, such as the long manufacturing time of injection molds and the need to switch between production runs. In recent years, with the production system of high-quality, low-volume wax production, there has been a demand for the commercialization of ready-to-use tanks that meet the rapidly changing needs and have unique designs and trends. When working from such a place, a
I was hoping for F51J to decrease.

又従来、注や方ぬで製作したプラスチック精密一部品の
液相は大変困雌と嘴Ｉしてきた。その主たる理由は、曲
げ備差がケース用として金属や調合金製のものに比較し
弱いことと、硬化時の収縮が大きくて寸法梢度の管理が
困難であつｋ。Furthermore, in the past, the liquid phase of plastic precision parts manufactured by pouring methods has been considered very difficult. The main reasons for this are that the bending gap for the case is weaker than those made of metal or prepared alloy, and the shrinkage during hardening is large, making it difficult to control the dimensional degree.

本発明はこの工うな点を鑑みて、その目的を製作１軟の
大１鳴′ＩＫｉ鰯した腕時′＃′１用プラスチックケー
スと、江型用合ｉ、ｔｍ脂の強厩同上と収縮率の低減に
ある。すなわち、減圧下で脱泡しておいたＩ４性と転耳
性のある液状合成ゴムを器の中に流し込む。In view of these disadvantages, the present invention aims to manufacture a plastic case for 1 soft large 1 ring 'IKi sardine arm time'#' 1, a plastic case for E type, TM resin strong stable and shrinkable. It is in the reduction of the rate. That is, liquid synthetic rubber having I4 properties and ear-rolling properties, which has been defoamed under reduced pressure, is poured into a container.

腕時計原型４（以後、原型よいう）を器の中央に置く。Place wristwatch prototype 4 (hereinafter referred to as prototype) in the center of the bowl.

１００℃、１時間で加熱したのち、ｌ１Ｊ１．型４ｔ−
取外し、合成ゴム３０表面に１０μｍ以上の薄膜を作成
する。再び原型４を置き、前述の液状合成ゴムを流し込
む。ｔｏｏ℃、％時間後に合成ゴム５′が硬化した後、
原型４をＪ＆り出す。注型用合成樹脂を減圧下で脱泡し
たのち、前述の合成コム型３３′に注入し、ガラス板７
で上Ｆから固にする。After heating at 100°C for 1 hour, l1J1. Type 4t-
After removal, a thin film of 10 μm or more is created on the surface of the synthetic rubber 30. Place the master mold 4 again and pour the liquid synthetic rubber described above. After the synthetic rubber 5' is cured after % hours at too°C,
J& take out prototype 4. After degassing the synthetic resin for casting under reduced pressure, it is poured into the synthetic comb mold 33' described above, and the glass plate 7 is poured.
Make it hard from the top F.

液状合成樹脂５の硬化に、７０℃水中で、２時間！Ｉｏ
分間、そのおと９０℃水中で２時間加熱する。2 hours in 70℃ water to cure liquid synthetic resin 5! Io
Heat for 2 hours in water at 90°C for 2 hours.

合成ゴム型Ｓ　５’　ｆ脱型成杉さｆＬＱ腕時引時引用
プラスチックケース５供さｒｔ　ｆｃ　。Synthetic rubber mold S 5' f Demoulding Narusugi Sa f LQ arm time reduction plastic case 5 provided rt fc.

以下実施例により本発明全詳細にＮ５！明する。N5! All details of the present invention will be explained below with examples. I will clarify.

実施例１ 合成ＩＩ脂：増感剤入りスピラン＋＠脂合ｇ＝ｒム：透
明性液状シリコンゴム 硬化条件８７０℃　水中　２時間６０ラナ９０℃　水ｔ
’Ｐ　　２＃ｉ間 本実翔険１１　ＶＣおける試料の諸物件は、曲げ強度５
〜６　）、９　／　、、、ｇで透明な合成樹１旨となっ
た。合成ゴム型の製作から、ケース完成まで約８時間で
作成した。Example 1 Synthetic II fat: Sensitizer-containing spiran+@fat combination g=rm: Transparent liquid silicone rubber Curing conditions: 870°C, water, 2 hours, 60°C, 90°C, water t
'P 2#i Mamoto Minoru Shoken 11 The various properties of the sample in VC have a bending strength of 5
~6), 9/,,,g resulted in a transparent synthetic tree. It took about eight hours to create the case, from making the synthetic rubber mold to completing the case.

実施例２ 合成＠脂：増感剤入りスピラン樹脂８０ｗｔ４ニアクリ
ル系のシラン処理ガラス繊 唯　２０ｗｔ係 合成コム：透明性液状シリコンゴム 硬化条Ｐｌ：：　７０℃　水中　２時間３０分９０℃　
水中　２時間 本実施例における試料の諸物件は、曲げ強度６〜８　ｋ
ｌｌ　／　ｃ＃Ｉで、製作時間約８時間であった。Example 2 Synthesis@Fast: Spiran resin with sensitizer 80wt4 Niacrylic silane treated glass fiber 20wt Synthetic comb: Transparent liquid silicone rubber cured strip Pl:: 70°C Under water 2 hours 30 minutes 90°C
Underwater for 2 hours The specimens in this example have a bending strength of 6 to 8 k.
ll/c#I, and the production time was approximately 8 hours.

実施−１６ 賞ｂＸｊＭ　、信：反応促進削入りアリルジグリコール
カーボネート　ａｏｗｔ％ ニアクリル系のシラン処理ガラス繊 維　　　　　　　２０　ｗｔ％ 合成ゴム：　ｓ、ｓ’−ジクロロ−４，４′ジ了ミノジ
フェニルメタン入りエポキシ倒Ｈ旨 硬化条件＝７０℃　水中　２時間 ８０℃空気中　１時間３０分 本実施例における試料の諸物件は、曲げ強電４〜５ｋｇ
／−で、製作時間７時間であった。Implementation-16 Award bXjM, Credit: Allyl diglycol carbonate with accelerated reaction awt% Niacrylic silane-treated glass fiber 20 wt% Synthetic rubber: s,s'-dichloro-4,4'dichlorominodiphenylmethane containing epoxy dichloromethane Curing conditions = 70°C in water for 2 hours 80°C in air for 1 hour and 30 minutes.
/-, and the production time was 7 hours.

以上の実施例からみらｎる工うに、合成ゴムとして透明
性シリコンゴムを用いると、腕時計の嶺雑な形状を忠実
に形作ら几る。気泡除去のため減圧下で液状合成ゴムを
注型すると、原型との接触面の再現性が保たｎる。合成
ゴムとして祉他にエポキシゴムやウレタンゴムの液状の
ものが有効である。又、長さ１０μｍ以上で、アスペク
ト比１０以上のアクリル系シラン処理ガラス繊維を合成
樹脂に、６０ｗｔチ以下の割合で混合すると、硬化さｆ
Ｌｆｉ−合成樹脂の中で、異方性とめＩＥ性から強度向
上の大切な倹素となった。以上、上記の組成範囲、硬化
条件からなる注型用プラスチックケース製造方法は全く
新規なものであり、かつ製瑣工畿が以前の方法と比較し
て減少した大変抽埴の鵠いものである。As can be seen from the above embodiments, when transparent silicone rubber is used as the synthetic rubber, the rough shape of the wristwatch can be faithfully formed. When liquid synthetic rubber is cast under reduced pressure to remove air bubbles, the reproducibility of the contact surface with the original mold is maintained. In addition to synthetic rubber, epoxy rubber and urethane rubber in liquid form are effective. Furthermore, when acrylic silane-treated glass fibers with a length of 10 μm or more and an aspect ratio of 10 or more are mixed with a synthetic resin at a ratio of 60 wt or less, the hardening f.
Among Lfi synthetic resins, it has become an important element for improving strength due to its anisotropy and IE properties. As described above, the method for manufacturing a plastic case for casting comprising the above composition range and curing conditions is completely new, and it is extremely expensive and requires less manufacturing time than previous methods.

【図面の簡単な説明】[Brief explanation of the drawing]

第１図は従来法による一部プレスさｆｌたステンレス材
ト、フレス研磨後のステンレスケース図。 第２図は本発明に１づく合成ゴｌ硬化時のプラスチック
ケース製造時の断面図。 １４５図は、合成樹脂硬化時のプラスチックケース製造
時の断面図。 ｔｔｉステンレス材、２＃Ｊｉステンレスケース、３３
′は合成ゴム、４はケース原型、５框プラスチツクケー
ス、６は薄膜、７はガラス板、８はピノ。 以　　　上Figure 1 is a diagram of a stainless steel case that has been partially pressed using the conventional method and has been polished. FIG. 2 is a cross-sectional view of the plastic case manufactured when the synthetic rubber according to the present invention is cured. Figure 145 is a cross-sectional view of the plastic case being manufactured when the synthetic resin is cured. tti stainless steel material, 2#Ji stainless steel case, 33
' is synthetic rubber, 4 is a case prototype, 5 is a plastic case, 6 is a thin film, 7 is a glass plate, and 8 is a pinot. that's all

Claims (2)

【特許請求の範囲】[Claims] （１）　　加熱することで硬化する注型粗合成側１１’
＋１を用い、型材に弾性のある合成ゴムを使い、減圧ト
で加熱硬化することを％Ｉとする時引用プラスチックケ
ースの製造方法。(1) Casting rough synthesis side 11' that hardens by heating
+1, elastic synthetic rubber is used for the molding material, and %I is the method of manufacturing a plastic case that is heat-cured under reduced pressure. （２）長さ１０μｍ以上、アスペクト比１０以上のアク
リル系のシラン処理したガラス繊維で、６Ｑｗｔ優以下
の割合で混合した特許請求の範囲第一項記載の時引用プ
ラスチックケースの製造方法(2) A method for manufacturing a plastic case according to claim 1, which is made of acrylic silane-treated glass fibers having a length of 10 μm or more and an aspect ratio of 10 or more, mixed in a proportion of 6 Qwt or less.