JPH09175709A - Flapper made of thermalplastic resin - Google Patents
Flapper made of thermalplastic resinInfo
- Publication number
- JPH09175709A JPH09175709A JP33651495A JP33651495A JPH09175709A JP H09175709 A JPH09175709 A JP H09175709A JP 33651495 A JP33651495 A JP 33651495A JP 33651495 A JP33651495 A JP 33651495A JP H09175709 A JPH09175709 A JP H09175709A
- Authority
- JP
- Japan
- Prior art keywords
- resin
- flapper
- hollow
- thermoplastic resin
- hollow portion
- 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.)
- Granted
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
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Feeding Of Articles By Means Other Than Belts Or Rollers (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
- Handling Of Continuous Sheets Of Paper (AREA)
- Separation, Sorting, Adjustment, Or Bending Of Sheets To Be Conveyed (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は熱可塑性樹脂製フラ
ッパーに関するものであり、さらに詳しくは寸法精度が
良好で、生産性に優れ、軽量化され、さらにリサイクル
性にも優れた熱可塑性樹脂製フラッパーに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flapper made of a thermoplastic resin, and more specifically to a flapper made of a thermoplastic resin having good dimensional accuracy, excellent productivity, light weight, and excellent recyclability. Regarding
【０００２】[0002]
【従来の技術】フラッパーは電気・電子分野、特にＯＡ
分野の機構部品として幅広く用いられている。そして、
成形性が良く、軽量で、しかも錆びないという理由から
各種の樹脂がフラッパーに応用され、近年ますますその
利用が拡大している。従来、このようなフラッパーは軸
に金属シャフトを用いて熱可塑性樹脂によるインサート
成形により製品を得ている。図４〜６に図示する。2. Description of the Related Art Flappers are used in electric and electronic fields, especially OA
Widely used as mechanical parts in the field. And
Various resins have been applied to flappers because they have good moldability, are lightweight, and do not rust, and their use is expanding more and more in recent years. Conventionally, such flappers have been manufactured by insert molding with a thermoplastic resin using a metal shaft as the shaft. It is illustrated in FIGS.
【０００３】このような方法を用いるのは、熱可塑性樹
脂により軸部と爪部を一体成形すると、通常の射出成形
では成形時の収縮により成形品にソリが発生してしまう
ので成形品が曲がってしまい、寸法精度の良いものが得
られないためである。このため、軸に金属シャフトを用
いて爪部のみを樹脂でインサート成形している。この様
な方法によれば、結果として曲がりの少ない製品が得ら
れる。When such a method is used, when the shaft portion and the claw portion are integrally molded with a thermoplastic resin, warpage occurs in the molded product due to shrinkage during molding in normal injection molding, which causes warpage in the molded product. This is because a product with high dimensional accuracy cannot be obtained. Therefore, a metal shaft is used as the shaft, and only the claw portion is insert-molded with resin. According to such a method, a product with less bending can be obtained as a result.
【０００４】しかしながら、この方法ではインサート成
形時に金属シャフトを金型中にセットする工程が必要で
あり、樹脂のみの射出成形と比較すると生産性に劣る。
また、金属を軸に用いるので部品が重くなる。更に最近
社会問題となっている環境問題を考慮すると、部品が金
属と樹脂の一体物なので、材料のリサイクルの際に金属
と樹脂の分離が困難であるという問題点がある。However, this method requires a step of setting the metal shaft in the mold during insert molding, and is inferior in productivity as compared with injection molding using only resin.
Further, since the metal is used for the shaft, the parts become heavy. Further, in consideration of an environmental problem which has become a social problem recently, there is a problem that it is difficult to separate the metal and the resin at the time of recycling the material because the parts are an integrated body of the metal and the resin.
【０００５】[0005]
【発明が解決しようとする課題】本発明は、寸法精度が
良好で、生産性に優れ、軽量化され、さらにリサイクル
性にも優れた熱可塑性樹脂製フラッパーを提供する。DISCLOSURE OF THE INVENTION The present invention provides a flapper made of a thermoplastic resin having good dimensional accuracy, excellent productivity, reduced weight, and excellent recyclability.
【０００６】[0006]
【課題を解決するための手段】すかわち、本発明は、軸
部と爪部が熱可塑性樹脂により一体成形され、かつ内部
に中空部を有することを特徴とする熱可塑性樹脂製フラ
ッパーである。中空部が、次式（１）で定義される関係
を満足することが好ましく、又、次式（２）で定義され
る関係を満足することが好ましい熱可塑性樹脂製フラッ
パーである。That is to say, the present invention is a flapper made of a thermoplastic resin, characterized in that the shaft portion and the claw portion are integrally molded of a thermoplastic resin and have a hollow portion inside. . It is preferable that the hollow portion satisfies the relationship defined by the following formula (1), and that the hollow part satisfies the relationship defined by the following formula (2).
【０００７】０．９≦Ｌ(ｂ)／Ｌ(ａ)≦１ （１） [式（１）において、Ｌ(ａ）はフラッパーの軸線に沿っ
た全長を示し、そしてＬ(ｂ）は該中空部の、フラッパ
ーの軸線に沿った長さを示す。］ １０≦Ｖｈ≦５０ （２） [式（２）において、Ｖｈは該熱可塑性樹脂製フラッパ
ーの中空率（％）を示す。］ 熱可塑性樹脂製フラッパーの熱可塑性樹脂は、ポリアセ
タール樹脂、又はポリアミド樹脂であることが好まし
い。0.9 ≦ L (b) / L (a) ≦ 1 (1) [In the formula (1), L (a) represents the total length along the flapper axis, and L (b) is The length of the hollow portion along the axis of the flapper is shown. 10 ≦ Vh ≦ 50 (2) [In the formula (2), Vh represents the hollow ratio (%) of the thermoplastic resin flapper. The thermoplastic resin of the thermoplastic resin flapper is preferably a polyacetal resin or a polyamide resin.
【０００８】本発明の熱可塑性樹脂製フラッパーは、中
空射出成形法で形成されることが好ましく、更には、金
型キャビティに溶融樹脂を射出してから、一方の端面か
ら加圧流体を圧入すると共に、他方の端面から、金型キ
ャビティ内の余剰の溶融樹脂もしくは余剰の溶融樹脂と
余剰の加圧流体を金型キャビティ外へ流出させる中空射
出成形方法が好ましい。The thermoplastic resin flapper of the present invention is preferably formed by a hollow injection molding method. Furthermore, after injecting a molten resin into a mold cavity, a pressurized fluid is press-fitted from one end surface. At the same time, it is preferable to use a hollow injection molding method in which excess molten resin in the mold cavity or excess molten resin and excess pressurized fluid flow out of the mold cavity from the other end surface.
【０００９】本発明でフラッパーとは軸線を中心に回転
することによって、爪部でものの搬送方向を制御する部
品であり、特にＯＡ機器（複写機、ファクシミリ、プリ
ンター等）の内部で紙の移動方向を制御するために用い
られる部品である。例えば図５及び図２の矢印４のよう
に紙等のものの移動方向を上下に分けることができる。
また、「爪部」とはものの搬送方向を制御するときにも
のと主に接触する機能部分である。更に、「軸部」とは
フラッパーが回転するときに他部品（軸受け部品）によ
って回転が安定するように支えられる部分である。「爪
部」と「軸部」以外の部分は作動に影響が無ければ任意
の形状をとることが可能である。また、「端面」とは成
形品の外表面で軸線と交わる部分の面をいう。図中に
「爪部」、「軸部」、及び「端面」の例を示した。In the present invention, the flapper is a component that controls the conveying direction of the claw portion by rotating about the axis line, and especially the movement of the paper inside the OA equipment (copier, facsimile, printer, etc.). It is a component used to control the direction. For example, as shown by an arrow 4 in FIGS. 5 and 2, the moving direction of paper or the like can be divided into upper and lower directions.
Further, the "claw portion" is a functional portion that mainly comes into contact with an object when controlling the conveyance direction of the object. Further, the "shaft portion" is a portion that is supported by another component (bearing component) such that the rotation is stable when the flapper rotates. The portions other than the “claw portion” and the “shaft portion” can have any shape as long as they do not affect the operation. Further, the "end surface" means a surface of an outer surface of the molded product which intersects with the axis. In the figure, examples of the “claw portion”, the “shaft portion”, and the “end surface” are shown.
【００１０】本発明における中空部は、成形品内に中空
部を生じさせる成形方法によって形成されるもので、こ
の中空部は巣（ボイド）や発泡剤による気泡とは相違す
るものである。成形品内に中空部を発生させる成形方法
はどのようなものでもよいが、接合部を残すことなく１
回の樹脂射出で成形でき、しかもバリの発生が少ないこ
とから、中空射出成形方法が好ましい。The hollow portion in the present invention is formed by a molding method for producing a hollow portion in a molded product, and the hollow portion is different from voids and bubbles due to a foaming agent. Any molding method may be used to form the hollow portion in the molded product, but it is possible to
The hollow injection molding method is preferable because molding can be performed by resin injection once and burrs are less likely to occur.
【００１１】本発明でいう中空射出成形方法とは、射出
成形において溶融樹脂を成形用型（普通は金型である
が、それに限定されない）のキャビティー中に射出中ま
たは射出後、中空部形成流体を樹脂中に加圧下で注入
し、この中空部形成流体を介して溶融樹脂に圧力を加え
ながら冷却し、中空成形品を得る成形法である。中空射
出成形法の代表的な方法は特公昭５７ー１４９６８号公
報に開示されている。The hollow injection molding method referred to in the present invention means forming a hollow portion during or after injecting a molten resin into a cavity of a molding die (usually, but not limited to a die) in injection molding. This is a molding method in which a fluid is injected into a resin under pressure, and the molten resin is cooled while applying pressure through the hollow portion forming fluid to obtain a hollow molded article. A representative method of the hollow injection molding method is disclosed in Japanese Patent Publication No. Sho 57-14968.
【００１２】本発明における上記中空部形成流体とは、
常温常圧でガス状または液状のもので、射出成形の温度
及び圧力下で、成形に用いる溶融樹脂と反応または相溶
しないものが使用される。例えば窒素、炭酸ガス、空
気、ヘリウム、ネオン、アルゴン、水蒸気、グリセリ
ン、流動パラフィン等であるが、通常はガス体が使用さ
れ、特に窒素、ヘリウム、ネオン、アルゴン等の不活性
ガスが好ましく用いられる。経済性を考慮すると工業的
には窒素ガスがより好適に使用される。The above-mentioned hollow portion forming fluid in the present invention is
A gas or liquid at room temperature and atmospheric pressure that does not react or be compatible with the molten resin used for molding at the temperature and pressure of injection molding is used. For example, nitrogen, carbon dioxide, air, helium, neon, argon, water vapor, glycerin, liquid paraffin, etc. are usually used, and a gas body is usually used, and an inert gas such as nitrogen, helium, neon, argon is preferably used. . Nitrogen gas is more preferably used industrially in consideration of economy.
【００１３】本発明の中空射出成形法は、通常の射出成
形機と中空部形成流体の圧入装置の組み合わせによって
行われる。中空部形成流体の圧入装置は、溶融樹脂の射
出後に配管を通して溶融樹脂中に中空部形成流体を圧入
し、設定時間この中空部形成流体を介してキャビティー
中の樹脂を加圧する装置である。これには注入する中空
部形成流体を予め一定圧力まで高圧に圧縮し、アキュム
レーターに蓄え、溶融樹脂の射出後に配管を通して高圧
の中空部形成流体を圧入する方式や一定量の中空部形成
流体を計量し、これをポンプや加圧シリンダーでキャビ
ティーに順次送り込み、加圧していく方式等があるが、
射出後の溶融樹脂中に中空部形成流体を送り込めれば如
何なる方式も可能である。上記の中空部形成流体は成形
品を得るときの型開きの前に圧力が解放される。最終的
に熱可塑性樹脂中に中空部を有するが、好適な中空率は
１０〜５０％である。これは中空率が高いと成形途中に
中空部形成流体が樹脂層を突き破り成形が安定しずらく
なり、低いとソリが生じ易くなる場合があるためであ
る。なお、中空率とは次式で定義される。The hollow injection molding method of the present invention is carried out by a combination of an ordinary injection molding machine and a hollow part forming fluid press-fitting device. The hollow part forming fluid press-fitting device is a device that presses the hollow part forming fluid into the molten resin through a pipe after the injection of the molten resin and pressurizes the resin in the cavity through the hollow part forming fluid for a set time. For this, the hollow part forming fluid to be injected is compressed to a high pressure in advance to a high pressure, stored in an accumulator, and after injection of the molten resin, a high pressure hollow part forming fluid is pressed in through a pipe or a fixed amount of hollow part forming fluid. There is a method such as measuring and sequentially sending it to the cavity with a pump or a pressurizing cylinder to pressurize,
Any method is possible as long as the hollow part forming fluid is sent into the molten resin after injection. The pressure of the above-mentioned hollow portion forming fluid is released before the mold opening when obtaining a molded product. Although the thermoplastic resin finally has a hollow portion, the preferable hollow ratio is 10 to 50%. This is because when the hollow ratio is high, the hollow part forming fluid breaks through the resin layer during molding, making it difficult to stabilize the molding, and when the hollow ratio is low, warping is likely to occur. The hollow ratio is defined by the following equation.
【００１４】中空率（％）＝｛（Ｖ×ρ−Ｍ）／（Ｖ×
ρ）｝×１００ ［ただし、上式においてＶは熱可塑性樹脂部分の見かけ
体積、ρは用いた熱可塑性樹脂の比重、Ｍは中空の熱可
塑性樹脂部分の重量である］。本発明に用いられる熱可
塑性樹脂としてはポリエチレン、ポリプロピレン、ポリ
スチレン、ＡＢＳ樹脂、ポリ塩化ビニル、ポリアミド、
ポリアセタール、ポリカーボネート、変性ポリフェニレ
ンエーテル、ポリエチレンテレフテレート、ポリブチレ
ンテレフタレート、ポリフェニレンスルフィド、ポリイ
ミド、ポリアミドイミド、ポリエーテルイミド、ポリア
リレート、ポリサルフォン、ポリエーテルサルホン、ポ
リエーテルエーテルケトン、液晶ポリマー、ポリテトラ
フルオロエチレン、熱可塑性エラストマー等が挙げられ
るが、通常の射出成形が可能であれば、いかなる熱可塑
性樹脂も用いることができる。特に、ポリアセタール樹
脂（以下ＰＯＭと略す）、及びポリアミド樹脂（以下Ｐ
Ａと略す）は耐熱性が高く、機械的物性にも優れ、さら
には摺動特性にも優れるためフラッパー用の樹脂として
多く用いられており、本発明においても好適に用いられ
る。Hollow rate (%) = {(V × ρ-M) / (V ×
ρ)} × 100 [wherein V is the apparent volume of the thermoplastic resin portion, ρ is the specific gravity of the thermoplastic resin used, and M is the weight of the hollow thermoplastic resin portion]. As the thermoplastic resin used in the present invention, polyethylene, polypropylene, polystyrene, ABS resin, polyvinyl chloride, polyamide,
Polyacetal, polycarbonate, modified polyphenylene ether, polyethylene terephthalate, polybutylene terephthalate, polyphenylene sulfide, polyimide, polyamideimide, polyetherimide, polyarylate, polysulfone, polyethersulfone, polyetheretherketone, liquid crystal polymer, polytetrafluoro Examples thereof include ethylene and thermoplastic elastomer, but any thermoplastic resin can be used as long as ordinary injection molding is possible. In particular, polyacetal resin (hereinafter abbreviated as POM) and polyamide resin (hereinafter P
(Abbreviated as A) has high heat resistance, is excellent in mechanical properties, and is also excellent in sliding properties, and is therefore often used as a resin for flappers, and is also preferably used in the present invention.
【００１５】本発明では内部に中空部を有するので、耐
熱性、機械的強度等をアップする目的で、必要に応じて
無機及び、または有機の充填材を熱可塑性樹脂に配合す
ることが出来る。好適な充填材としては、ガラス繊維、
炭素繊維、金属繊維、アラミド繊維、チタン酸カリウ
ム、アスベスト、炭化ケイ素、セラミック、窒化ケイ
素、硫酸バリウム、硫酸カルシウム、カオリン、クレ
ー、パイロフィライト、ベントナイト、セリサイト、ゼ
オライト、マイカ、雲母、ネフェリンシナイト、タル
ク、アタルパルジャイト、ウオラストナイト、ＰＭＦ、
フェライト、ケイ酸カルシウム、炭酸カルシウム、炭酸
マグネシウム、ドロマイト、酸化亜鉛、酸化チタン、酸
化マグネシウム、酸化鉄、二硫化モリブデン、黒鉛、石
こう、ガラスビーズ、ガラスパウダー、ガラスバルー
ン、石英、石英ガラスなどの強化充填材を挙げることが
出来き、これらは中空であってもよい。また、これらの
強化充填材は２種以上を併用することが可能であり、必
要によりシラン系、チタン系などのカップリング剤で予
備処理して使用する事ができる。Since the present invention has a hollow portion inside, an inorganic and / or organic filler can be blended with the thermoplastic resin, if necessary, for the purpose of improving heat resistance, mechanical strength and the like. Suitable fillers include glass fiber,
Carbon fiber, metal fiber, aramid fiber, potassium titanate, asbestos, silicon carbide, ceramics, silicon nitride, barium sulfate, calcium sulfate, kaolin, clay, pyrophyllite, bentonite, sericite, zeolite, mica, mica, nephelinesh Knight, talc, atarupulgite, wollastonite, PMF,
Reinforcement of ferrite, calcium silicate, calcium carbonate, magnesium carbonate, dolomite, zinc oxide, titanium oxide, magnesium oxide, iron oxide, molybdenum disulfide, graphite, gypsum, glass beads, glass powder, glass balloon, quartz, quartz glass, etc. Fillers may be mentioned, which may be hollow. Further, two or more kinds of these reinforcing fillers can be used in combination, and if necessary, they can be pretreated with a coupling agent such as a silane type or titanium type and used.
【００１６】また本発明の好ましい態様として、中空率
をアップする目的で、金型内に補助室（補助キャビティ
ーあるいは捨てキャビティーとも称する）を設けて、余
剰の溶融樹脂、または余剰の溶融樹脂と余剰の加圧流体
を金型キャビティ外へ流出させている。この補助キャビ
ティーの代表例は特開平３ー１２１８２０号公報に開示
されている。また、本公報には、キャビティー内への溶
融樹脂の射出時にはキャビティーと補助室間を遮断しキ
ャビティー内への中空部形成流体の圧入時にはキャビテ
ィーと補助室間を解放する方法が開示されているが、本
発明においてもこの方法は好適に用いられる。In a preferred embodiment of the present invention, for the purpose of increasing the hollow ratio, an auxiliary chamber (also referred to as an auxiliary cavity or a discarding cavity) is provided in the mold to allow the excess molten resin or the excess molten resin. And the excess pressurized fluid is allowed to flow out of the mold cavity. A typical example of this auxiliary cavity is disclosed in JP-A-3-121820. Further, the present disclosure discloses a method in which the space between the cavity and the auxiliary chamber is shut off when the molten resin is injected into the cavity, and the space between the cavity and the auxiliary chamber is released when the hollow part forming fluid is pressed into the cavity. However, this method is also preferably used in the present invention.
【００１７】なお、本発明において「金型キャビティ」
とは金型内の空間で製品部に相当する部分をいう。In the present invention, "mold cavity"
Means the part corresponding to the product part in the space inside the mold.
【００１８】[0018]
【００１９】[0019]
【実施例１】軸線に沿った長さが３２０ｍｍ（このうち
軸部の長さは両端のそれぞれ１０ｍｍ）で軸部の直径が
６ｍｍのポリアセタール樹脂製フラッパー（旭化成工業
（株）製ポリアセタールコポリマー「テナックーＣ ８
５２０」を樹脂として用いた。）を作製した。製品態様
を図１に示す。Example 1 A flapper made of a polyacetal resin having a length of 320 mm along the axis (of which the length of the shaft portion is 10 mm at each end) and a diameter of the shaft portion of 6 mm (a polyacetal copolymer “Tenakku” manufactured by Asahi Kasei Corporation) C 8
520 "was used as the resin. ) Was prepared. The product form is shown in FIG.
【００２０】金型温度は８０℃、シリンダーの設定温度
は２００℃で中空射出成形を行った。また、樹脂の計量
値を調整して中空率２８％の成形品を得た。樹脂中に注
入する中空部形成流体には窒素ガスを用い、ガス注入口
はシリンダーのノズル部に設けた。このときシリンダー
へのガスの侵入（金型と反対方向への侵入）を防止する
目的でガス注入口のスクリュー側（ホッパー側）にシャ
ットオフ弁を設けた。Hollow injection molding was carried out at a mold temperature of 80 ° C. and a cylinder set temperature of 200 ° C. Moreover, the measured value of the resin was adjusted to obtain a molded product having a hollow ratio of 28%. Nitrogen gas was used as the hollow part forming fluid to be injected into the resin, and the gas injection port was provided in the nozzle part of the cylinder. At this time, a shut-off valve was provided on the screw side (hopper side) of the gas injection port in order to prevent gas from entering the cylinder (into the direction opposite to the mold).
【００２１】ガス注入装置に窒素ガスを導入し、１００
ｋｇ／ｃｍ2に昇圧してアキュームレーターにたくわ
え、樹脂射出後に配管を通して樹脂中に注入した。窒素
ガスは、ノズルからスプルー、ランナー、ゲートを通っ
て製品キャビティー中に導入された。図７の様な断面の
成形品が得られた。ゲートは図７に示すように製品の片
側に１点で設けた。このときの条件はガス圧入遅延時間
（樹脂の射出後ガスを注入するまでの時間）を０秒、ガ
ス圧入時間（ガス注入を行う時間）を５秒、圧力保持時
間（ガス注入をとめガス系を閉じた状態に保持する時間
とガス圧入時間をたした時間）を２５秒とした。型開き
は圧力保持時間終了から５秒後に行い、成形品を取り出
した。Nitrogen gas was introduced into the gas injection device, and 100
The pressure was increased to kg / cm 2 , stored in an accumulator, and injected into the resin through a pipe after the resin was injected. Nitrogen gas was introduced into the product cavity from the nozzle through the sprue, runner and gate. A molded product having a cross section as shown in FIG. 7 was obtained. The gate was provided at one point on one side of the product as shown in FIG. The conditions at this time are as follows: gas injection delay time (time until resin is injected after resin injection) is 0 seconds, gas injection time (time to perform gas injection) is 5 seconds, pressure holding time (gas injection is stopped and gas system is stopped). Was maintained for 25 seconds. Mold opening was performed 5 seconds after the pressure holding time was completed, and the molded product was taken out.
【００２２】本実施例では金属インサートを金型中にセ
ットする工程がないので生産性に優れていた。また、全
ての部分が樹脂で一体化されているのでリサイクル性に
優れる成形品が得られた。ソリ（曲がり度合い、振れ精
度）が比較例１と同等の成形品が得られた。In this embodiment, there was no step of setting the metal insert in the mold, and therefore the productivity was excellent. Moreover, since all parts are integrated with resin, a molded product having excellent recyclability was obtained. A molded product having the same warp (bending degree, deflection accuracy) as in Comparative Example 1 was obtained.
【００２３】[0023]
【実施例２】ゲートと反対側の端面に補助キャビティー
を用い、余剰の溶融樹脂と余剰の加圧流体を金型キャビ
ティ外へ流出させた他は実施例１と同様な方法で成形品
を得た。このため中空部は図８に示すように両端面間を
貫通していた。また、中空率は３２％であった。実施例
１より中空部が長く、中空率も高いので、実施例１より
もソリが少なかった。[Example 2] A molded product was prepared in the same manner as in Example 1 except that an auxiliary cavity was used on the end face opposite to the gate, and excess molten resin and excess pressurized fluid were allowed to flow out of the mold cavity. Obtained. Therefore, the hollow portion penetrated between the both end faces as shown in FIG. The hollow rate was 32%. Since the hollow portion was longer and the hollow ratio was higher than that of Example 1, warpage was less than that of Example 1.
【００２４】実施例１同様、金属インサートを金型中に
セットする工程がないので生産性に優れていた。また、
全ての部分が樹脂で一体化されているのでリサイクル性
に優れる成形品が得られた。Similar to Example 1, the productivity was excellent because there was no step of setting the metal insert in the mold. Also,
Since all parts were integrated with resin, a molded product with excellent recyclability was obtained.
【００２５】[0025]
【実施例３】熱可塑性樹脂としてナイロン６６（旭化成
工業（株）製ポリアミド６６「レオナ １３００Ｓ」）
を用い、成形機のシリンダー温度を２９０℃にした他は
実施例２と同様な方法で成形品を得た。実施例１、およ
び実施例２同様、金属インサートを金型中にセットする
工程がないので生産性に優れていた。また、全ての部分
が樹脂で一体化されているのでリサイクル性に優れる成
形品が得られた。ソリ（曲がり度合い、振れ精度）が実
施例２と同等の成形品が得られた。[Example 3] Nylon 66 (polyamide 66 "Leona 1300S" manufactured by Asahi Kasei Co., Ltd.) as a thermoplastic resin
Was used to obtain a molded product in the same manner as in Example 2 except that the cylinder temperature of the molding machine was set to 290 ° C. Similar to Example 1 and Example 2, the productivity was excellent because there was no step of setting the metal insert in the mold. Moreover, since all parts are integrated with resin, a molded product having excellent recyclability was obtained. A molded product having the same warp (bending degree, deflection accuracy) as in Example 2 was obtained.
【００２６】[0026]
【比較例１】金型を開き金属インサート（ステンレス
鋼）を金型中にセットする工程を行い、金型を閉めた後
で爪部のみをポリアセタール樹脂（旭化成工業（株）製
ポリアセタールコポリマー「テナックーＣ ８５２０」
を樹脂として用いた。）によりインサート成形し、図４
の様な製品が得られた。[Comparative Example 1] A step of opening a mold and setting a metal insert (stainless steel) in the mold was performed, and after closing the mold, only the claws were made of polyacetal resin (polyacetal copolymer "Tenac Co.," manufactured by Asahi Kasei Corporation). C 8520 "
Was used as the resin. ) Insert-molded by
A product like that was obtained.
【００２７】金属インサートを金型にセットする工程が
あるので、人手やロボットを必要とし、さらにこの工程
に時間がとられるので成形サイクルも実施例より長くな
った。このため実施例より生産性に劣っていた。また、
出来上がった製品は金属と樹脂が一体化しているのでリ
サイクル性にも劣っていた。また、金属を軸に用いてい
るので、実施例より部品が重くなってしまっていた。Since there is a step of setting the metal insert in the mold, manpower and a robot are required, and since this step requires time, the molding cycle is longer than that of the embodiment. Therefore, the productivity was inferior to that of the example. Also,
The finished product was inferior in recyclability because the metal and resin were integrated. Further, since the metal is used for the shaft, the parts are heavier than in the embodiment.
【００２８】[0028]
【発明の効果】本発明による熱可塑性樹脂製フラッパー
は良好な寸法精度をもち、生産性に優れ、軽量化され、
更にはリサイクル性にも優れる。このため本発明による
熱可塑性樹脂製フラッパーは機構部品として優れてお
り、特にＯＡ機器（複写機、ファクシミリ、プリンター
等）の内部機構部品として有用である。The thermoplastic resin flapper according to the present invention has good dimensional accuracy, is excellent in productivity, and is lightweight.
Furthermore, it has excellent recyclability. Therefore, the flapper made of thermoplastic resin according to the present invention is excellent as a mechanical component, and is particularly useful as an internal mechanical component of OA equipment (copier, facsimile, printer, etc.).
【図１】実施例のフラッパーの態様図。FIG. 1 is a diagram showing an embodiment of a flapper of an embodiment.
【図２】図１のＡＡ断面の断面図。FIG. 2 is a sectional view taken along the line AA in FIG.
【図３】図１のＢＢ断面の断面図。FIG. 3 is a cross-sectional view taken along the line BB of FIG.
【図４】比較例のフラッパーの態様図。FIG. 4 is an aspect diagram of a flapper of a comparative example.
【図５】図４のＣＣ断面の断面図。5 is a cross-sectional view of the CC cross section of FIG.
【図６】図４のＤＤ断面の断面図。6 is a cross-sectional view of the DD cross section of FIG. 4.
【図７】実施例１の軸線を通る断面での断面図。FIG. 7 is a cross-sectional view of a cross section passing through the axis of the first embodiment.
【図８】実施例２の軸線を通る断面での断面図。FIG. 8 is a cross-sectional view of a cross section passing through the axis of the second embodiment.
１ 軸部（金属） ２ シャフト部（金属） ３ 爪部（樹脂） ４ もの（例えば紙）の搬送方向を示す矢印 ５ 軸部（樹脂） ６ シャフト部（樹脂） ７ 爪部（樹脂） ８ 中空部 ９ ゲート部 １０ 補助室への連通部 １１ 軸線 １２ 端面 1 Shaft Part (Metal) 2 Shaft Part (Metal) 3 Claw Part (Resin) 4 Arrow that indicates the conveying direction of things (for example, paper) 5 Shaft Part (Resin) 6 Shaft Part (Resin) 7 Claw Part (Resin) 8 Hollow Part 9 Gate part 10 Communication part to auxiliary chamber 11 Axis 12 End surface
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 // Ｂ４１Ｊ 15/04 Ｂ４１Ｊ 15/04 Ｂ２９Ｋ 59:00 77:00 ─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location // B41J 15/04 B41J 15/04 B29K 59:00 77:00
Claims (6)
形され、かつ内部に中空部を有することを特徴とする熱
可塑性樹脂製フラッパー。1. A flapper made of a thermoplastic resin, characterized in that the shaft portion and the claw portion are integrally molded of a thermoplastic resin and have a hollow portion inside.
を満足することを特徴とする請求項１記載の熱可塑性樹
脂製フラッパー。 ０．９≦Ｌ(ｂ)／Ｌ(ａ)≦１ （１） [式（１）において、Ｌ(ａ）はフラッパーの軸線に沿っ
た全長を示し、そしてＬ(ｂ）は該中空部の、フラッパ
ーの軸線に沿った長さを示す。］2. The flapper made of a thermoplastic resin according to claim 1, wherein the hollow portion satisfies the relationship defined by the following formula (1). 0.9 ≦ L (b) / L (a) ≦ 1 (1) [In the formula (1), L (a) represents the total length along the axis of the flapper, and L (b) represents the hollow portion. , Shows the length along the flapper axis. ]
を満足することを特徴とする請求項１、２記載の熱可塑
性樹脂製フラッパー。 １０≦Ｖｈ≦５０ （２） [式（２）において、Ｖｈは該熱可塑性樹脂製フラッパ
ーの中空率（％）を示す。］3. The flapper made of a thermoplastic resin according to claim 1, wherein the hollow portion satisfies the relationship defined by the following expression (2). 10 ≦ Vh ≦ 50 (2) [In the formula (2), Vh represents the hollow ratio (%) of the flapper made of the thermoplastic resin. ]
ド樹脂であることを特徴とする請求項１〜３記載の熱可
塑性樹脂製フラッパー。4. The flapper made of a thermoplastic resin according to claim 1, wherein the resin is a polyacetal resin or a polyamide resin.
とを特徴とする請求項１〜４記載の熱可塑性樹脂製フラ
ッパーの中空射出成形方法。5. The hollow injection molding method for a flapper made of a thermoplastic resin according to claim 1, wherein the hollow portion is formed by a hollow injection molding method.
ら、一方の端面から加圧流体を圧入すると共に、他方の
端面から、金型キャビティ内の余剰の溶融樹脂もしくは
余剰の溶融樹脂と余剰の加圧流体を金型キャビティ外へ
流出させることを特徴とする請求項５記載の熱可塑性樹
脂製フラッパーの中空射出成形方法。6. The molten resin is injected into the mold cavity, and then the pressurized fluid is pressed from one end face, and the excess molten resin in the mold cavity or the excess molten resin and excess is injected from the other end face. The hollow injection molding method for a flapper made of a thermoplastic resin according to claim 5, wherein the pressurized fluid of (1) is caused to flow out of the mold cavity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33651495A JP3580623B2 (en) | 1995-12-25 | 1995-12-25 | Flapper made of thermoplastic resin |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33651495A JP3580623B2 (en) | 1995-12-25 | 1995-12-25 | Flapper made of thermoplastic resin |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH09175709A true JPH09175709A (en) | 1997-07-08 |
| JP3580623B2 JP3580623B2 (en) | 2004-10-27 |
Family
ID=18299922
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33651495A Expired - Lifetime JP3580623B2 (en) | 1995-12-25 | 1995-12-25 | Flapper made of thermoplastic resin |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3580623B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001001362A (en) * | 1999-06-24 | 2001-01-09 | Polyplastics Co | Hollow branch pawl made of resin |
-
1995
- 1995-12-25 JP JP33651495A patent/JP3580623B2/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2001001362A (en) * | 1999-06-24 | 2001-01-09 | Polyplastics Co | Hollow branch pawl made of resin |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3580623B2 (en) | 2004-10-27 |
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