JPH08142217A - Rod-shaped resin molded product and molding thereof - Google Patents
Rod-shaped resin molded product and molding thereofInfo
- Publication number
- JPH08142217A JPH08142217A JP6283826A JP28382694A JPH08142217A JP H08142217 A JPH08142217 A JP H08142217A JP 6283826 A JP6283826 A JP 6283826A JP 28382694 A JP28382694 A JP 28382694A JP H08142217 A JPH08142217 A JP H08142217A
- Authority
- JP
- Japan
- Prior art keywords
- molded product
- cross
- sectional area
- rod
- lightening
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Moulding By Coating Moulds (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、繊維を混入させること
により強化され且つ断面を円形又は角形等とする棒状樹
脂成形品及びその成形方法に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rod-shaped resin molded product which is reinforced by mixing fibers and has a circular or rectangular cross section, and a molding method thereof.
【０００２】[0002]
【従来の技術】樹脂成形品は軽量化するのに有利である
と共に、錆による腐食の心配がないので水と接する箇所
で好適に使用できる反面、樹脂単独では引張強度および
曲げ強度に乏しい欠点がある。そこで、樹脂内に繊維を
混入せしめることによって強度を高める技術が一般に知
られており、多くの棒状製品に、そのような樹脂組成物
を使用したものが実用化されている。このような繊維の
混入による強化は、繊維とマトリックス樹脂の密着、繊
維の強度、繊維の伸び及び繊維の配向によって大きく左
右されるといっても過言でない。2. Description of the Related Art A resin molded product is advantageous in reducing the weight, and since it is free from the risk of corrosion due to rust, it can be suitably used in a place in contact with water, but on the other hand, the resin alone has the drawback of poor tensile strength and bending strength. is there. Therefore, a technique for increasing the strength by mixing fibers in the resin is generally known, and many rod-shaped products using such a resin composition have been put into practical use. It is no exaggeration to say that such reinforcement by mixing fibers is greatly influenced by the adhesion between the fibers and the matrix resin, the strength of the fibers, the elongation of the fibers, and the orientation of the fibers.
【０００３】[0003]
【発明が解決しようとする課題】しかし従来の成形法で
はその繊維の配向の問題に関しての考慮がなく、そのた
め材料の持っている性能を十分に発揮した高い強度の棒
状樹脂成形品が得られなかった。また、その原因解明も
されていないのが実情であった。However, in the conventional molding method, there is no consideration regarding the problem of the orientation of the fiber, and therefore, a high strength rod-shaped resin molded article that sufficiently exhibits the performance of the material cannot be obtained. It was Moreover, the fact is that the cause has not been elucidated.
【０００４】[0004]
【課題を解決するための手段】本発明は、成形品中に含
有される繊維の配向状態を解明し、それによって繊維の
補強効果を有効に利用して強度をより向上させ品質の安
定化を図ることに成功した棒状樹脂成形品及びその成形
方法である。その第１の手段の構成は、繊維を含有する
熱可塑性合成樹脂による棒状樹脂成形品であって、その
長手方向の全体又は一部分に樹脂流動方向と実質的に平
行に設置された肉抜き孔を有し、その肉抜き孔の長手方
向に直交する断面における、その肉抜き孔を設ける前の
断面積に対して、その肉抜き溝を設けた後の断面積の比
率が７０％以上、及びその肉抜き溝を設けた後の断面積
に対して、コア層の断面積の比率が７０％以下となる前
記繊維を流動方向と実質的に平行に強く配向させた棒状
樹脂成形品である。ここでいうコア層とはスキン層以外
の断面の部分を指し、またスキン層とは成形品表層部の
繊維が流動方向と実質的に平行に配向している部分を指
し、そして実質的に平行とは、樹脂流動方向と繊維との
平均角度が４５度未満であることをいう。また、第２手
段として肉抜き孔による肉抜き後の成形品の、肉抜き前
の成形品に対する重量平均繊維長の保持率を、６０％以
上とした棒状樹脂成形品である。同様に、第３手段とし
て前記繊維を重量平均繊維長0.3mm以上とした棒状樹脂
成形品で、繊維長が長くなる程肉抜き孔設置による繊維
配向変化効果が大きくなり、望ましい。更に、第４手段
として繊維を含有する熱可塑性合成樹脂組成物を、肉抜
き孔を付与した成形品の長手方向の端部に相当する部位
に設定されたゲートを介して製品部キャビティ内へ、充
填させることを特徴とする棒状樹脂成形品の成形方法で
ある。DISCLOSURE OF THE INVENTION The present invention elucidates the orientation state of the fibers contained in a molded article, thereby effectively utilizing the reinforcing effect of the fibers to further improve the strength and stabilize the quality. A rod-shaped resin molded product and a molding method thereof which have been successfully achieved. The constitution of the first means is a rod-shaped resin molded product made of a thermoplastic synthetic resin containing fibers, and a lightening hole provided substantially parallel to the resin flow direction is provided in all or part of the longitudinal direction thereof. In the cross section orthogonal to the longitudinal direction of the lightening hole, the ratio of the cross sectional area after forming the lightening groove to the cross sectional area before forming the lightening hole is 70% or more, and It is a rod-shaped resin molded product in which the fibers having a ratio of the cross-sectional area of the core layer of 70% or less with respect to the cross-sectional area after providing the lightening groove are strongly oriented substantially parallel to the flow direction. The core layer as used herein refers to a portion of the cross section other than the skin layer, and the skin layer refers to a portion in which the fibers of the surface layer of the molded article are oriented substantially parallel to the flow direction, and are substantially parallel. Means that the average angle between the resin flow direction and the fiber is less than 45 degrees. As a second means, the rod-shaped resin molded product has a weight-average fiber length retention ratio of the molded product after the lightening through the lightening hole to the molded product before the lightening is 60% or more. Similarly, as a third means, a rod-shaped resin molded product in which the fibers have a weight average fiber length of 0.3 mm or more is preferable, and the longer the fiber length, the greater the effect of changing the fiber orientation due to the provision of the lightening hole is desirable. Further, as a fourth means, a thermoplastic synthetic resin composition containing fibers is introduced into the product cavity through a gate set at a portion corresponding to an end portion in the longitudinal direction of a molded product having a lightening hole, It is a method for molding a rod-shaped resin molded product, which is characterized by filling.
【０００５】[0005]
【作用】上記第１手段により、肉抜き孔を形成する前の
断面積に対する、その肉抜き孔を形成した後の断面積の
比率が７０％以上、及びその肉抜き孔を形成した後の断
面積に対するコア層の断面積の比率を７０％以下とする
ので、金型製品部キャビティ壁面及び肉抜き孔を構成す
る金型コア壁面に接する成形品表層（スキン層）では、
成形充填時に強化繊維が剪断を強く受け、樹脂流動方向
（成形品軸方向）に強く配向し、その配向方向に対する
引張強度及び曲げ強度を大幅に向上させる事ができる。
また、肉抜きにより成形品の軽量化を計ることも出来
る。また、肉抜き孔による肉抜き後の成形品の、肉抜き
前の成形品に対する重量平均繊維長の保持率を、６０％
以上とする第２手段により、また、繊維を長くする第３
手段により、これらの効果を更に高めることができる。
更に、肉抜き孔を付与した成形品の長手方向の端部に相
当する部位に設定されたゲートを介して製品部キャビテ
ィ内へ充填させる第４手段により、強化繊維が流動方向
と同一の一定方向に平行に強く配向されることにより、
同様にその長手方向に対する引張強度及び曲げ強度を大
幅に向上させる事ができる。With the first means, the ratio of the cross-sectional area after forming the lightening hole to the cross-sectional area before forming the lightening hole is 70% or more, and the cross-section after forming the lightening hole is Since the ratio of the cross-sectional area of the core layer to the area is 70% or less, in the surface layer (skin layer) of the molded product that is in contact with the cavity wall surface of the die product part and the die core wall surface that constitutes the lightening hole,
The reinforcing fibers are strongly sheared during molding and filling, and are strongly oriented in the resin flow direction (axial direction of the molded product), and the tensile strength and bending strength in the orientation direction can be significantly improved.
In addition, it is possible to reduce the weight of the molded product by removing the meat. In addition, the retention rate of the weight average fiber length of the molded product after the thinning with the lightening hole is 60% with respect to the molded product before the thinning.
By the above second means, the third means for lengthening the fiber
By these means, these effects can be further enhanced.
Further, by the fourth means for filling the cavity of the product part through the gate set at the part corresponding to the end part in the longitudinal direction of the molded product provided with the lightening hole, the reinforcing fiber is in the same constant direction as the flowing direction. By being strongly aligned parallel to
Similarly, the tensile strength and bending strength in the longitudinal direction can be greatly improved.
【０００６】[0006]
【実施例】本発明に係る棒状樹脂成形品及びその成形方
法、ならびにその方法で使用する金型構造を図面に基づ
いて説明する。図１は、本発明に係る固定型と可動型と
からなる射出成形用金型であって棒状試験片の射出成形
用金型を例示している。１は成形機のノズルに接続され
るスプルー、４は製造しようとする成形品の製品部キャ
ビティであってその上下の端部にはネジ山を設けてあ
る。２はスプルー１から製品部キャビティ４に向けて溶
融樹脂を流すためのランナー、３はランナー２から製品
部キャビティ４の上端に設ける、 樹脂を流入させるため
のゲートである。５は肉抜き用のピンであってピンのサ
イズ変更及び脱着ができる構造としている。他に金型に
は、図示しないが成形品及びランナーを突き出すための
エジェクター並びに金型の冷却温調を行なうための冷却
回路が設置されている。DESCRIPTION OF THE PREFERRED EMBODIMENTS A rod-shaped resin molded product according to the present invention, a molding method therefor, and a mold structure used in the method will be described with reference to the drawings. FIG. 1 exemplifies an injection molding die including a fixed die and a movable die according to the present invention, which is a rod-shaped test piece. Reference numeral 1 is a sprue connected to a nozzle of a molding machine, 4 is a product cavity of a molded product to be manufactured, and threads are provided at upper and lower ends thereof. Reference numeral 2 is a runner for flowing the molten resin from the sprue 1 toward the product portion cavity 4, and 3 is a gate provided on the upper end of the product portion cavity 4 from the runner 2 for injecting the resin. Reference numeral 5 is a thinning pin having a structure in which the size of the pin can be changed and detached. In addition, the mold is provided with an ejector (not shown) for ejecting the molded product and the runner, and a cooling circuit for controlling the cooling temperature of the mold.
【０００７】熱可塑性合成樹脂組成物としては、一般に
繊維強化熱可塑性樹脂として知られているものがいずれ
も使用できるが、ガラス繊維、カーボン繊維又は合成繊
維などの長繊維に、押出し機で溶融した熱可塑性プラス
チックを含浸させ、適当な長さに切断してペレット化し
たものが好適に使用される。この熱可塑性合成樹脂組成
物は、長繊維の折損を最低限に留めるため、圧縮比が小
さく、深溝のスクリューを備え、ノズルの大きな射出装
置を使用して射出することが望ましく、特に逆流防止弁
を備えたものが好ましい。As the thermoplastic synthetic resin composition, any of those generally known as fiber reinforced thermoplastic resins can be used, but long fibers such as glass fibers, carbon fibers or synthetic fibers are melted by an extruder. A pellet impregnated with a thermoplastic, cut to an appropriate length and pelletized is preferably used. Since this thermoplastic synthetic resin composition minimizes breakage of long fibers, it is desirable to inject by using an injection device having a small compression ratio, a deep groove screw, and a large nozzle, and especially a check valve. The thing equipped with is preferable.
【０００８】このような熱可塑性合成樹脂組成物を用い
て、周知の射出手段によって樹脂成形品を成形する。図
１のように成形品に肉抜き孔を設けることにより、強化
繊維を肉抜き孔と平行の方向又は流動方向へ、より強く
配向させることが出来る。つまり、肉抜き孔により成形
品の断面積は減少するが、断面係数を考慮した引張強度
の向上はもちろんであるが、さらに引張破壊荷重の向上
もみられる。溶融樹脂中の重量平均繊維長が長い場合は
この傾向がより顕著となる。肉抜き孔の寸法はマトリッ
クス樹脂の種類並びに棒状成形品の径及び厚み等の条件
により変化するが、例えばマトリックス樹脂をポリアミ
ド６６、径がφ１０mmの棒状成形品の場合、肉抜き孔は
φ３mmぐらいが適当である。この場合、肉抜き孔を設け
る前の断面積は、5.02π= 25.0π mm2である。そして、
肉抜き孔を設けた後の断面積は、肉抜き孔を形成する肉
厚部の断面積に相当する5.02π-1.52π= 22.75π mm2で
ある。したがって、肉抜き孔を設ける前の断面積に対す
る、その肉抜き孔を設け後の断面積の比率は、22.75π
／25.0π = 91.0 (%)となる。また、成形品の断面積が
大きくなる場合には、肉抜き孔の内周面に凹凸状に若し
くは襞状に形成し、孔の断面形状を円形、楕円形若しく
は多角形とする肉抜き孔を複数本又は円形孔の内側に放
射状に隔壁を設け、分割される断面を扇形とする孔を複
数本設けることも有効である。本発明において、上記の
ような肉抜き孔は、本発明の目的を達成するために意図
的に設けられるものであり、製品としての機能上必須な
ものとして設けられる孔とは区別される。A resin molded product is molded using such a thermoplastic synthetic resin composition by a known injection means. By providing a lightening hole in the molded product as shown in FIG. 1, the reinforcing fibers can be more strongly oriented in the direction parallel to the lightening hole or in the flow direction. That is, although the cross-sectional area of the molded product is reduced by the lightening hole, not only the tensile strength considering the sectional modulus is improved but also the tensile breaking load is further improved. This tendency becomes more remarkable when the weight average fiber length in the molten resin is long. The size of the lightening hole varies depending on the type of matrix resin and the diameter and thickness of the rod-shaped molded product. For example, in the case of a polyamide 66 polyamide resin and a rod-shaped molded product with a diameter of 10 mm, the lightening hole should be about 3 mm. Appropriate. In this case, the cross-sectional area before forming the lightening hole is 5.0 2 π = 25.0 π mm 2 . And
The cross-sectional area after forming the lightening hole is 5.0 2 π-1.5 2 π = 22.75 π mm 2 , which corresponds to the cross-sectional area of the thick portion forming the lightening hole. Therefore, the ratio of the cross-sectional area after forming the lightening hole to the cross-sectional area before forming the lightening hole is 22.75π
/25.0π = 91.0 (%). Also, when the cross-sectional area of the molded product becomes large, a lightening hole having a circular, elliptical or polygonal cross-sectional shape is formed on the inner peripheral surface of the lightening hole in an uneven or pleated shape. It is also effective to provide partition walls radially inside a plurality of holes or circular holes and to provide a plurality of holes each having a fan-shaped cross section. In the present invention, the above-described lightening holes are intentionally provided in order to achieve the object of the present invention, and are distinguished from the holes provided as essential for the function of the product.
【０００９】＜実験例＞棒状の成形品にて、肉抜き孔を
有した成形品と有しない成形品の引張破壊荷重と引張強
度の比較を試みた。又成形品破断面の繊維配向の断面観
察も行った。断面積及びコア層面積の計測並びに断面観
察は図２の断面ａ−ａから断面ｄ−ｄまでの各部分で行
い、断面観察の繊維配向からコア層Ｃ及びスキン層Ｓ
Ｏ，ＳＩを測定した。ここで肉抜き孔の周面に位置する
内側スキン層ＳＩ及び外側スキン層ＳＯ以外の残った部
分がコア層Ｃである。実験は前記実施例の図１の金型を
使用し、図２の肉抜きを有しない射出成形品及び３種類
の肉抜きを有する射出成形品を得た。成形条件、実験条
件、実験結果は下記表１から表４に示す。ここで使用し
た熱可塑性合成樹脂組成物は、ポリアミド６６をマトリ
ックス樹脂とし、ガラス繊維を５０重量％含有させた短
繊維及び長繊維の強化樹脂材料（ペレット長１２．７m
m）である。また、重量平均繊維長の保持率は、肉抜き
溝を設置する前の重量平均繊維長に対する肉抜き設置し
た後の重量平均繊維長の比率を示す。断面積比率は、肉
抜き溝を設置する前の断面積に対する肉抜き溝を設置し
た後の断面積の比率を示す。コア層面積比率は、肉抜き
溝を設置した後の全断面積に対するコア層の断面積の比
率を示す。Experimental Example An attempt was made to compare the tensile breaking load and tensile strength of a rod-shaped molded product with and without a lightening hole. Further, the cross section of the fiber orientation of the fracture surface of the molded product was also observed. The measurement of the cross-sectional area and the area of the core layer, and the cross-sectional observation are performed in each part from cross-section aa to cross-section d-d in FIG.
O and SI were measured. Here, the remaining portion other than the inner skin layer SI and the outer skin layer SO located on the peripheral surface of the lightening hole is the core layer C. In the experiment, the mold of FIG. 1 of the above-mentioned example was used to obtain an injection-molded product having no lightening and an injection-molding product having three kinds of lightening of FIG. The molding conditions, experimental conditions, and experimental results are shown in Tables 1 to 4 below. The thermoplastic synthetic resin composition used here is a short fiber and long fiber reinforced resin material (pellet length 12.7 m
m). The weight average fiber length retention rate indicates the ratio of the weight average fiber length after the meat removal installation to the weight average fiber length before the meat removal grooves are installed. The cross-sectional area ratio indicates the ratio of the cross-sectional area after installing the lightening groove to the cross-sectional area before installing the lightening groove. The core layer area ratio indicates the ratio of the cross-sectional area of the core layer to the total cross-sectional area after the lightening groove is installed.
【００１０】[0010]
【表１】 尚成形機は株式会社大隈鉄工所製のＯＫＭ１５０を使用
した。[Table 1] As the molding machine, OKM150 manufactured by Okuma Iron Works Co., Ltd. was used.
【００１１】[0011]
【表２】 尚、株式会社島津製作所製 万能試験機ＤＳＳ−５００
０を使用した。[Table 2] Universal testing machine DSS-500 manufactured by Shimadzu Corporation
0 was used.
【００１２】[0012]
【表３】 [Table 3]
【００１３】[0013]
【表４】 [Table 4]
【００１４】特に、引張試験後の断面は繊維が流動方向
と平行に又はほぼ平行に配向しているスキン層部分の面
積は、全体の面積に対し、肉抜き孔無しの時３２％、肉
抜き孔(III)の時７１％であり、肉抜き孔によるコア層
面積比率が繊維配向に大きな影響を与えていることが確
認された。また、長繊維強化樹脂材料では長繊維の折損
が短繊維の場合より生じやすく、肉抜き孔の径を大きく
する程、繊維の折損による重量平均繊維長の短小化が顕
著なので、肉抜き孔による肉抜き後の成形品の、肉抜き
前の、即ち肉抜き孔を形成しない成形品に対する重量平
均繊維長の保持率を、６０％以上とすることが好まし
い。Particularly, in the cross-section after the tensile test, the area of the skin layer portion in which the fibers are oriented parallel or substantially parallel to the flow direction is 32% of the total area when there is no lightening hole, It was 71% for the holes (III), and it was confirmed that the core layer area ratio due to the lightening holes had a great influence on the fiber orientation. Further, in the long fiber reinforced resin material, the breakage of the long fibers is more likely to occur than in the case of the short fibers, and as the diameter of the lightening hole is increased, the shortening of the weight average fiber length due to the breakage of the fiber is more remarkable. It is preferable that the weight-average fiber length retention ratio of the molded product after thinning is 60% or more with respect to the molded product before thinning, that is, the molded product in which the thinned holes are not formed.
【００１５】以上の結果より、樹脂に繊維を含有させた
成形品に於いて、肉抜き孔を設けることにより、軽量化
が図れるばかりか、有効断面積が減少するにもかかわら
ず、繊維の配向を改善した効果により引張強度は向上
し、又引張破壊荷重も向上していることが確認された。
又、長繊維強化材料の場合、その向上度合いが短繊維強
化材料よりも大きい。From the above results, in the molded product in which the resin contains fibers, by providing the lightening holes, not only the weight can be reduced but also the effective cross-sectional area is reduced, but the orientation of the fibers is reduced. It was confirmed that the tensile strength was improved and the tensile breaking load was also improved due to the effect of improving.
In the case of the long fiber reinforced material, the degree of improvement is larger than that of the short fiber reinforced material.
【００１６】本実施例及び実験例はポリアミドについて
説明したが、他の熱可塑性合成樹脂組成物、例えばＰＢ
Ｔ．ＰＥＴ．ポリアセタール、ポリプロピレン、ポリウ
レタン等でも数値の違いはあるにしろ同様の結果が確認
され、本発明で使用される熱可塑性合成樹脂、繊維の種
類は自由に選択できる。Although the present examples and experimental examples have been described with respect to polyamides, other thermoplastic synthetic resin compositions such as PB are used.
T. PET. Similar results were confirmed even with polyacetal, polypropylene, polyurethane and the like, although there were differences in numerical values, and the types of thermoplastic synthetic resin and fibers used in the present invention can be freely selected.
【００１７】[0017]
【発明の効果】本発明によれば、繊維強化樹脂材料を用
いた棒状成形品に於いて、肉抜き前の断面積に対して、
肉抜き孔設置後の断面積の比率が７０％以上、及びその
肉抜き孔設置後の断面に於いてコア層の比率が７０％以
下となるように肉抜き孔を設けて成形することにより、
金型製品部キャビティ壁面及び肉抜き孔を構成する金型
コア壁面に接する成形品表層（スキン層）では、成形充
填時に強化繊維が剪断を強く受け、樹脂流動方向（成形
品軸方向）に繊維が強く配向し、その配向方向に対する
引張強度を大幅に向上させる事が出来る。また、その肉
抜き孔により軽量化を計ることが出来る。特に、肉抜き
孔による肉抜き後の成形品の、肉抜き前の成形品に対す
る重量平均繊維長の保持率を、６０％以上とする第２手
段により、また、射出成形品中の強化繊維の重量平均繊
維長を0.3mm以上とする長繊維強化樹脂材料を用いて、
適切な肉抜き孔を設ける第３手段により、強化繊維の配
向を一定方向に強く配向させることができ、その引張破
壊荷重が向上できる。更に、肉抜き孔を付与した成形品
の長手方向の端部に相当する部位に設定されたゲートを
介して製品部キャビティ内へ充填させる第４手段によ
り、強化繊維が流動方向と同一の一定方向に平行に強く
配向されるので、同様にその長手方向に対する引張強度
及び曲げ強度を大幅に向上させる事ができる。According to the present invention, in a rod-shaped molded article using a fiber reinforced resin material, with respect to the cross-sectional area before thinning,
By forming the lightening holes so that the ratio of the cross-sectional area after the lightening holes is installed is 70% or more, and the ratio of the core layer is 70% or less in the cross section after the lightening holes are installed,
In the surface layer (skin layer) of the molded product that is in contact with the wall surface of the mold product cavity and the wall surface of the mold core that constitutes the lightening hole, the reinforcing fibers are strongly sheared during molding and filling, and the fiber flows in the resin flow direction (axial direction of the molded product). Is strongly oriented, and the tensile strength in the orientation direction can be greatly improved. Moreover, the weight reduction can be achieved by the lightening hole. In particular, by the second means for maintaining the weight average fiber length retention of the molded product after thinning through the lightening hole with respect to the molded product before thinning, and by the use of the reinforcing fiber in the injection molded product. Using a long fiber reinforced resin material with a weight average fiber length of 0.3 mm or more,
By the third means for providing an appropriate lightening hole, the orientation of the reinforcing fibers can be strongly oriented in a fixed direction, and the tensile breaking load thereof can be improved. Further, by the fourth means for filling the cavity of the product part through the gate set at the part corresponding to the end part in the longitudinal direction of the molded product provided with the lightening hole, the reinforcing fiber is in the same constant direction as the flowing direction. Since it is strongly oriented in parallel with, the tensile strength and bending strength in the longitudinal direction can be greatly improved.
【図１】 本発明に係る肉抜き孔を設けた棒状試験片の
成形実験用金型の説明図である。FIG. 1 is an explanatory view of a mold for a molding test of a rod-shaped test piece provided with a lightening hole according to the present invention.
【図２】 実験例で採用した基本構造の説明図である。FIG. 2 is an explanatory diagram of a basic structure adopted in an experimental example.
１・・スプルー、２・・ランナー、３・・ゲート、４・
・製品部キャビティ、５・・肉抜き孔用ピン。1 ... Sprue, 2 ... Runner, 3 ... Gate, 4 ...
・ Product part cavity, 5 ・ ・ Pin for lightening hole.
───────────────────────────────────────────────────── 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 Ｂ２９Ｋ 105:14 Ｂ２９Ｌ 23:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Internal reference number FI technical display area B29K 105: 14 B29L 23:00
Claims (4)
棒状樹脂成形品であって、その長手方向の全体又は一部
分に樹脂流動方向と実質的に平行に設置された肉抜き孔
を有し、その肉抜き孔の長手方向に直交する断面におけ
る、その肉抜き孔を設ける前の断面積に対して、その肉
抜き溝を設けた後の断面積の比率が７０％以上、及びそ
の肉抜き溝を設けた後の断面積に対して、コア層の断面
積の比率が７０％以下となる前記繊維を流動方向と実質
的に平行に強く配向させた棒状樹脂成形品。1. A rod-shaped resin molded article made of a thermoplastic synthetic resin containing fibers, which has a lightening hole provided substantially in parallel with the resin flow direction in all or a part of its longitudinal direction, In the cross section orthogonal to the longitudinal direction of the lightening hole, the ratio of the cross-sectional area after forming the lightening groove to the cross-sectional area before forming the lightening hole is 70% or more, and the lightening groove is A rod-shaped resin molded product in which the fibers having a ratio of the cross-sectional area of the core layer of 70% or less to the cross-sectional area after being provided are strongly oriented substantially parallel to the flow direction.
の、肉抜き前の成形品に対する重量平均繊維長の保持率
を、６０％以上とする請求項１記載の棒状樹脂成形品。2. The rod-shaped resin molded product according to claim 1, wherein the weight-average fiber length retention ratio of the molded product after lightening through the lightening hole to the molded product before lightening is 60% or more.
する請求項１の棒状樹脂成形品。3. The rod-shaped resin molded article according to claim 1, wherein the fibers have a weight average fiber length of 0.3 mm or more.
を、肉抜き孔を付与した成形品の長手方向の端部に相当
する部位に設定されたゲートを介して製品部キャビティ
内へ、充填させることを特徴とする棒状樹脂成形品の成
形方法。4. A thermoplastic synthetic resin composition containing fibers is filled into a cavity of a product section through a gate set at a portion corresponding to an end portion in the longitudinal direction of a molded product having a lightening hole. A method for molding a rod-shaped resin molded article, which comprises:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6283826A JPH08142217A (en) | 1994-11-17 | 1994-11-17 | Rod-shaped resin molded product and molding thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6283826A JPH08142217A (en) | 1994-11-17 | 1994-11-17 | Rod-shaped resin molded product and molding thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08142217A true JPH08142217A (en) | 1996-06-04 |
Family
ID=17670661
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6283826A Pending JPH08142217A (en) | 1994-11-17 | 1994-11-17 | Rod-shaped resin molded product and molding thereof |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08142217A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008008404A (en) * | 2006-06-29 | 2008-01-17 | Daicel Polymer Ltd | Fiber-reinforced thermoplastic resin gear |
| WO2016063855A1 (en) * | 2014-10-21 | 2016-04-28 | 東レ株式会社 | Fiber-reinforced thermoplastic resin molded article and fiber-reinforced thermoplastic resin molding material |
-
1994
- 1994-11-17 JP JP6283826A patent/JPH08142217A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2008008404A (en) * | 2006-06-29 | 2008-01-17 | Daicel Polymer Ltd | Fiber-reinforced thermoplastic resin gear |
| WO2016063855A1 (en) * | 2014-10-21 | 2016-04-28 | 東レ株式会社 | Fiber-reinforced thermoplastic resin molded article and fiber-reinforced thermoplastic resin molding material |
| JPWO2016063855A1 (en) * | 2014-10-21 | 2017-08-03 | 東レ株式会社 | Fiber-reinforced thermoplastic resin molded article and fiber-reinforced thermoplastic resin molding material |
| US10583591B2 (en) | 2014-10-21 | 2020-03-10 | Toray Industries, Inc. | Fiber-reinforced thermoplastic resin molded article and fiber-reinforced thermoplastic resin molding material |
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