JP2003039460A - Mold for molding toe box of safety shoes and method for manufacturing the toe box of the safety shoes - Google Patents

Mold for molding toe box of safety shoes and method for manufacturing the toe box of the safety shoes

Info

Publication number
JP2003039460A
JP2003039460A JP2001234820A JP2001234820A JP2003039460A JP 2003039460 A JP2003039460 A JP 2003039460A JP 2001234820 A JP2001234820 A JP 2001234820A JP 2001234820 A JP2001234820 A JP 2001234820A JP 2003039460 A JP2003039460 A JP 2003039460A
Authority
JP
Japan
Prior art keywords
mold
safety shoe
toecap
thermoplastic resin
molding
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
Application number
JP2001234820A
Other languages
Japanese (ja)
Inventor
Shoji Sakauchi
昭治 坂内
Takeo Fukuzawa
剛男 福沢
Masahiko Tominaga
真彦 富永
Kengo Ozaki
憲吾 尾崎
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SIMON CORP
Asahi Fiber Glass Co Ltd
Original Assignee
SIMON CORP
Asahi Fiber Glass Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by SIMON CORP, Asahi Fiber Glass Co Ltd filed Critical SIMON CORP
Priority to JP2001234820A priority Critical patent/JP2003039460A/en
Publication of JP2003039460A publication Critical patent/JP2003039460A/en
Pending legal-status Critical Current

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  • Footwear And Its Accessory, Manufacturing Method And Apparatuses (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)
  • Casting Or Compression Moulding Of Plastics Or The Like (AREA)

Abstract

PROBLEM TO BE SOLVED: To provide a mold having an even number of four or more recessed parts (cavities) and capable of efficiently manufacturing the toe box of safety shoes excellent in uniform quality and strength even if slightly different amounts of a resin raw material are supplied to a plurality of the recessed parts, and a method for manufacturing the toe box of the safety shoes. SOLUTION: In the mold for molding the toe box having a female mold equipped with recessed parts having the inner surfaces each coinciding with the outer surface shape of the toe box of the safety shoes, a male mold equipped with the projected parts having outer surfaces each coinciding with the inner surface shape of the toe box and knock pins for demolding the molded toe boxes, the knock pins are constituted so as to fall or rise by pressure at the time of molding. The method for manufacturing the toe box using the mold is also disclosed.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【発明の属する技術分野】本発明は、安全靴先芯成形用
金型(以下単に「金型」という)および安全靴先芯(以
下単に「先芯」という)の製造方法に関し、さらに詳し
くは強度が均一な先芯を生産性良く製造可能な金型およ
び先芯の製造方法に関する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mold for forming safety shoe toecaps (hereinafter simply referred to as "mold") and a method for manufacturing safety shoe toecaps (hereinafter simply referred to as "toecap"), and more specifically, The present invention relates to a mold capable of producing a toecap having uniform strength with high productivity and a method of producing the toecap.

【0002】[0002]

【従来の技術】従来より、先芯は、鉄製のものと繊維強
化熱可塑性樹脂製のものが知られている。前者は強度に
優れるという利点があるが、安全靴の重量が大になると
いう問題があり、近年では繊維強化熱可塑性樹脂製の先
芯が多く使用されている。
2. Description of the Related Art Toecaps made of iron and fiber reinforced thermoplastic resin have been conventionally known. The former has the advantage of being excellent in strength, but has the problem of increasing the weight of safety shoes, and in recent years, toecaps made of fiber reinforced thermoplastic resin have been widely used.

【0003】[0003]

【発明が解決しようとする課題】上記樹脂製の先芯の製
造には、プレス成形が使用されるが、その金型は通常2
個取りである。従って先芯の生産性は良好とはいえな
い。勿論、金型として多数個取りの金型の採用が考えら
れるが、実際には使用されていない。多数個取りの金型
が使用されない理由は、先ず第一に、多量の繊維を含む
繊維強化熱可塑性樹脂が通常の熱可塑性樹脂と異なり、
溶融時に自由流動性がないことから射出成形のような方
法が採用できないこと、多数個取りの金型の1個1個の
凹部(キャビティ)内に、全く同一重量(容量)の原料
を供給することが極めて困難であることなどが挙げられ
る。
Press molding is used to manufacture the above-mentioned resin toecap, and the mold is usually 2
It is an individual collection. Therefore, the productivity of the toecap is not good. Of course, it is possible to adopt a multi-cavity mold as the mold, but it is not actually used. The reason why a multi-cavity mold is not used is, first of all, that a fiber-reinforced thermoplastic resin containing a large amount of fibers is different from a normal thermoplastic resin,
Since there is no free flow when melted, methods such as injection molding cannot be adopted, and the exact same weight (capacity) of raw material is supplied into each recess (cavity) of a multi-cavity mold. Is extremely difficult.

【0004】2個取りの金型の場合には、2個の凹部に
多少異なる量の樹脂が挿入されても、プレス成形時に雄
型の押圧力が2個の凹部に分散され、不良品の発生は少
ない。ところが、例えば、4個取りの金型の場合、1個
のみの凹部における樹脂量が規定量よりも少ない場合、
雄型の押圧は残りの3個の凹部によって固定されてしま
い、樹脂量が少ない凹部においては、押圧力の不足から
強度が不足した不良品が発生する。一方、1個または2
個の凹部に充填される樹脂量が規定量よりも多い場合、
4個ともに十分な押圧力を加えると、樹脂量の多い凹部
においては多くのバリが発生し、該バリの処理に多くの
時間と労力を要する。
In the case of a two-piece mold, even if a slightly different amount of resin is inserted into the two recesses, the pressing force of the male mold is dispersed in the two recesses during press molding, resulting in a defective product. Occurrence is low. However, for example, in the case of a four-cavity mold, if the resin amount in only one recess is less than the specified amount,
The male press is fixed by the remaining three recesses, and in the recess with a small amount of resin, a defective product having insufficient strength is generated due to insufficient pressing force. On the other hand, 1 or 2
If the amount of resin filled in each recess is larger than the specified amount,
When a sufficient pressing force is applied to all four burrs, many burrs are generated in the concave portion having a large amount of resin, and it takes a lot of time and labor to process the burrs.

【0005】このような問題は、4個の凹部に全く同一
量の樹脂を充填することで理論的には解決されるが、実
際には、常に4個の凹部に全く同一量の樹脂を充填する
ことはできない。例えば、繊維強化熱可塑性樹脂をシー
ト状の原料とし、これを正確な重量に切り取り、これら
を凹部に挿入することで重量の均一化を図ることも提案
されているが、上記のシートの作製自体がコスト高であ
るし、また、正確な切り取りは非常に煩雑かつ困難であ
り、さらに切り屑が発生してコスト的に実用性がない。
Although such a problem is theoretically solved by filling four recesses with exactly the same amount of resin, in practice, four recesses are always filled with exactly the same amount of resin. You cannot do it. For example, it has been proposed to use a fiber-reinforced thermoplastic resin as a sheet-shaped raw material, cut it into an accurate weight, and insert these into recesses to make the weight uniform, but the production of the above-mentioned sheet itself However, the cost is high, and accurate cutting is very complicated and difficult, and further, chips are generated, which is not practical in terms of cost.

【0006】従って本発明の目的は、4個以上かつ偶数
個の凹部(キャビティ)を有する金型であって、複数の
凹部に多少異なる量の樹脂原料が供給されても、均一品
質で強度に優れた安全靴の先芯を効率よく生産できる金
型および先芯の製造方法を提供することである。
Therefore, an object of the present invention is to provide a mold having four or more and an even number of recesses (cavities), so that even if a plurality of recesses are supplied with slightly different amounts of resin raw material, the strength is uniform and the strength is high. It is an object of the present invention to provide a mold and a method of manufacturing a toecap that can efficiently produce a toecap of an excellent safety shoe.

【0007】[0007]

【課題を解決するための手段】上記目的は以下の本発明
によって達成される。すなわち、本発明は、先芯の外面
形状と一致する内面を有する凹部を備えた雌型と、先芯
の内面形状と一致する外面を有する凸部を備えた雄型
と、成形された先芯を脱型するノックピンとを有する金
型において、上記ノックピンが成形時の圧力によって下
降または上昇するように構成されていることを特徴とす
る金型、および該金型を用いる先芯の製造方法を提供す
る。
The above object can be achieved by the present invention described below. That is, the present invention provides a female mold having a concave portion having an inner surface matching the outer surface shape of the toe core, a male mold having a convex portion having an outer surface matching the inner surface shape of the toe core, and a molded toe core. In a mold having a knock pin for removing the mold, a mold characterized in that the knock pin is configured to be lowered or raised by pressure during molding, and a method of manufacturing a toecap using the mold. provide.

【0008】[0008]

【発明の実施の形態】次に好ましい実施の形態を挙げて
本発明をさらに詳しく説明する。図1は後に述べる図3
のA−B断面図を図解的に示した図であり、本発明の金
型の原理を説明する図である。本発明の金型100は、
先芯の外面形状と一致する内面を有する凹部1を備えた
雌型2と、先芯の内面形状と一致する外面を有する凸部
3を備えた雄型4と、成形された先芯を脱型するノック
ピン5とを有する先芯成形用金型100において、上記
ノックピン5が成形時の圧力によって下降または上昇す
るように構成されていることを特徴としている。
BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in more detail with reference to the following preferred embodiments. FIG. 1 shows FIG. 3 described later.
FIG. 6 is a diagram schematically showing a cross-sectional view taken along the line AB of FIG. The mold 100 of the present invention is
A female die 2 having a concave portion 1 having an inner surface matching the outer surface shape of the toe core, a male die 4 having a convex portion 3 having an outer surface matching the inner surface shape of the toe core, and a molded toe core are removed. A toecap molding die 100 having a knock pin 5 to be molded is characterized in that the knock pin 5 is configured to be lowered or raised by pressure during molding.

【0009】上記ノックピン5の下端は合成ゴムや天然
ゴムなどの弾性体6に当接しており、凹部1に挿入され
る樹脂原料7が規定量より多い場合には、図2の右側に
示すように、雄型4の凸部3の下降による圧力により、
ノックピン5が下降し(X’)過剰量の原料7の容量を
吸収し、凹部1と凸部3からはみ出してバリとなる原料
を減少させる。一方、凹部1に挿入される原料7が規定
量より少ない場合には、弾性体6の反発力(右側のノッ
クピンの押圧力の反作用)によりノックピン5が幾分上
昇(X)して原料7の不足容積分を補い、成形体中にボ
イドや低密度領域などの欠陥が発生するのを防止する。
The lower end of the knock pin 5 is in contact with an elastic body 6 such as synthetic rubber or natural rubber, and when the resin raw material 7 inserted into the recess 1 is larger than a prescribed amount, as shown on the right side of FIG. In addition, due to the pressure due to the lowering of the convex portion 3 of the male mold 4,
The knock pin 5 descends (X ′) to absorb the excessive amount of the raw material 7 and to reduce the amount of raw material that protrudes from the concave portion 1 and the convex portion 3 and becomes burrs. On the other hand, when the amount of the raw material 7 inserted into the concave portion 1 is less than the specified amount, the knock pin 5 is slightly lifted (X) by the repulsive force of the elastic body 6 (reaction of the pressing force of the right knock pin), and the raw material 7 is It compensates for the insufficient volume and prevents defects such as voids and low density regions from occurring in the molded body.

【0010】図2は、後に述べる図3のA−A’線断面
図を図解的に示した図である。図2に示すように一対の
凹部1−aと1−bが2対(1対は不図示)設けられた
雌型2において、凹部1−aの原料7が規定量よりも多
少不足しており、他の凹部1−bの原料7が規定量より
多い場合、図面上右側の原料7には過大な押圧力がかか
り、過剰分の原料7がノックピン5の頂部をX’mm押
し下げ、押し下げられたノックピン5の下端は弾性体6
を押圧下降する。
FIG. 2 is a view schematically showing a cross-sectional view taken along line AA ′ of FIG. 3 described later. As shown in FIG. 2, in a female mold 2 provided with two pairs (one pair not shown) of a pair of recesses 1-a and 1-b, the raw material 7 of the recesses 1-a was slightly less than the specified amount. When the amount of the raw material 7 in the other recess 1-b is larger than the specified amount, the raw material 7 on the right side of the drawing is applied with an excessive pressing force, and the excess amount of the raw material 7 pushes down the top of the knock pin 5 by X′mm and pushes it down. The lower end of the knock pin 5 is elastic body 6
Press down.

【0011】弾性体6は、好ましくは4個のノックピン
5にわたり連続しているので、この圧力は、規定量より
も少ない原料7が供給されている図面上左側のノックピ
ン5を押し上げ、押し上げられたノックピン5の先端は
凹部1中にXmm突き出され、突き出た分が原料7の容
積不足を補い、成形体8中にボイドや低密度部分が発生
するのを防止する。前述したノックピンは下降および上
昇する機能を有しているが、下降のみでも構わない。こ
の場合、例えば、弾性体6は全てのノックピン5にわた
って連続していることは必須ではなく、一対のノックピ
ン5ごとに独立していてもよく、また、図示していない
が弾性体を支持体全体に配置させてもよい。弾性体6の
厚みは通常3〜10mm程度である。また、弾性体の材
質は特に限定しないが、前述した合成ゴムや天然ゴムの
他に、フッ素ゴム、シリコンゴム、合成樹脂エラストマ
ーなどが挙げられる。このうち安価で弾力性を有するこ
とから合成ゴムや天然ゴムを用いることが好ましい。
Since the elastic body 6 is preferably continuous over the four knock pins 5, this pressure pushes up the knock pin 5 on the left side in the drawing to which the raw material 7 less than the specified amount is supplied. The tip of the knock pin 5 is projected into the recess 1 by X mm, and the projected portion compensates for the lack of the volume of the raw material 7 and prevents the formation of voids and low density portions in the molded body 8. The knock pin described above has a function of descending and ascending, but it may be only descending. In this case, for example, it is not essential that the elastic body 6 is continuous over all the knock pins 5, and the pair of knock pins 5 may be independent. It may be arranged at. The thickness of the elastic body 6 is usually about 3 to 10 mm. The material of the elastic body is not particularly limited, and examples thereof include fluororubber, silicon rubber, synthetic resin elastomer, and the like, in addition to the synthetic rubber and natural rubber described above. Of these, it is preferable to use synthetic rubber or natural rubber because they are inexpensive and have elasticity.

【0012】本発明において1個の雌型2は、2個の凹
部1を有するものでもよいが、好ましくは4個以上で偶
数の凹部1を有する。例えば、4個の凹部1を有する場
合、全ての凹部1に規定量の原料を挿入することが理想
的であるが、実際には4個の凹部1に挿入される原料は
それぞれ多少の誤差を有する。従来のものでは、規定量
を超える原料が供給された凹部1では、成形体にバリの
発生が多く、一方、規定量未満の原料が供給された凹部
1では、所望の強度の先芯が得られなかったが、本発明
のようにノックピン5を上下動可能にすることにより、
4個の凹部1に供給された原料の量に多少の誤差があっ
ても、その誤差はノックピン5の上下動により吸収され
るので、常にバリが少なくかつ均一な強度の先芯が効率
よくかつ不良品の発生が少なく提供される。
In the present invention, one female die 2 may have two recesses 1, but preferably four or more recesses 1 having an even number. For example, when four recesses 1 are provided, it is ideal to insert a specified amount of raw material into all the recesses 1, but in reality, the raw materials inserted into the four recesses 1 each have some errors. Have. In the conventional case, in the concave portion 1 to which the raw material exceeding the specified amount is supplied, burrs are often generated in the molded body, while in the concave portion 1 to which the raw material less than the specified amount is supplied, a toe core having a desired strength is obtained. Although not possible, by making the knock pin 5 movable up and down like the present invention,
Even if there is some error in the amount of raw material supplied to the four recesses 1, the error is absorbed by the vertical movement of the knock pin 5, so there is always a small amount of burr and an efficient toecap with uniform strength and It is provided with few defective products.

【0013】また、本発明においては、図2および図3
に示すように、それぞれの一対の凹部1は鏡像体のよう
に互いに向き合って配置されていることが好ましい。例
えば、一対の凹部1が同一の方向に配列されている場合
には、複数回のプレス操作によって雌型2に一方向に力
が加わり、雌型2が変位して凹部1と凸部3とのかみ合
わせが狂うようになり、金型が削れるという不具合が発
生するが、上記のように配列させることにより、金型の
変位、すなわち、金型の削れが防止される。
Further, in the present invention, FIG. 2 and FIG.
It is preferable that the pair of recesses 1 are arranged facing each other like mirror images, as shown in FIG. For example, when the pair of recesses 1 are arranged in the same direction, a force is applied to the female mold 2 in one direction by a plurality of pressing operations, the female mold 2 is displaced, and the concave portion 1 and the convex portion 3 are formed. However, there is a problem that the mold is scraped and the mold is scraped. However, the arrangement as described above prevents displacement of the mold, that is, scraping of the mold.

【0014】本発明の好適実施形態である4個の凹部1
を有する金型の雌型2(雄型は省略されている)は、2
対の凹部1がそれぞれ鏡像体状に形成され、それぞれの
凹部1の底面にはノックピン5が配され、該ノックピン
5の下端は共通の弾性体6に当接している。加熱板9を
適当な温度(例えば、90〜130℃)に加熱して雌型
2の温度を調整しておき、この凹部1に樹脂原料7をそ
れぞれ供給し、雄型4を下降させて図2に示すように先
芯8を形成する。このプレス成形に際しては、前記した
本発明の作用が発揮される。成形後に成形物が所定の温
度に冷却された後、雄型4を上昇させるとともに、ノッ
クピン5を上昇させ、成形された先芯8を脱型させ、多
少生じているバリを除去し、必要であれば、ノックピン
5の下降により生じた先芯8の凸部(X’)を研削して
製品化される。
Four recesses 1 according to a preferred embodiment of the present invention
The female mold 2 (the male mold is omitted) of the mold has 2
A pair of recesses 1 are formed in the shape of mirror images, and knock pins 5 are arranged on the bottom surface of each recess 1, and the lower ends of the knock pins 5 are in contact with a common elastic body 6. The heating plate 9 is heated to an appropriate temperature (for example, 90 to 130 ° C.) to adjust the temperature of the female mold 2, the resin raw material 7 is supplied to each of the recesses 1, and the male mold 4 is moved downward. A toecap 8 is formed as shown in FIG. At the time of this press molding, the action of the present invention described above is exhibited. After the molded product is cooled to a predetermined temperature after molding, the male die 4 is raised, the knock pin 5 is also raised, the molded toecap 8 is released from the mold, and any burrs that have occurred are removed, If there is, the convex portion (X ′) of the toecap 8 generated by the lowering of the knock pin 5 is ground to be commercialized.

【0015】本発明の先芯の製造方法は、以上説明した
本発明の金型を使用することを特徴とする。成形原料
は、繊維により強化された熱可塑性樹脂であれば特に限
定されないが、好適材料は、一方向長繊維強化熱可塑性
樹脂からなる線材(以下単に「線材」という)を適当な
長さに切断したものである。これらの線材を成形原料と
して用いる場合には、1個の先芯の重量に等しい線材を
計量して使用する。
The method of manufacturing a toecap of the present invention is characterized by using the mold of the present invention described above. The forming raw material is not particularly limited as long as it is a fiber-reinforced thermoplastic resin, but a suitable material is a wire made of unidirectional long fiber reinforced thermoplastic resin (hereinafter simply referred to as “wire material”) cut into an appropriate length. It was done. When these wire rods are used as a forming raw material, a wire rod having the same weight as one toecap is weighed and used.

【0016】原料の計量は、従来公知の計量方法で行な
うことができるが、より正確に計量するためには、例え
ば、100gを計量する場合、その90〜98g程度を
一度に計量し、これに少量ずつ同じ線材を追加して所定
量とすることが好ましい。例えば、株式会社イシダ製の
計量器NES−202WT(商品名)の改良機などが有
用である。このような計量方法を採用することによって
雌型2の凹部1に配置する線材の重量が、最大量の線材
の重量と最小量の線材の重量との差が2g以内とするこ
とができ、このような重量のバラツキであれば、本発明
の金型を用いることにより、不良品の発生を著しく低下
させることができる。
The raw material can be weighed by a conventionally known weighing method. For more accurate weighing, for example, when weighing 100 g, about 90 to 98 g is weighed at a time, and It is preferable to add the same wire material little by little to obtain a predetermined amount. For example, an improved machine of Ishida Co., Ltd. weighing machine NES-202WT (trade name) is useful. By adopting such a weighing method, the weight of the wire rod placed in the recess 1 of the female die 2 can be kept within 2 g of the difference between the weight of the maximum wire rod and the weight of the minimum wire rod. With such variations in weight, the use of the mold of the present invention can significantly reduce the generation of defective products.

【0017】計量した線材は、熱風処理、赤外線照射、
熱板などによる任意の加熱方法で溶融塊を作製し、金型
の凹部1(キャビティ)に供給する。上記計量方法に代
えて、予め線材を加熱溶融させてシート化し、該シート
を1個の先芯と同様な重量に切り取り、このシートを雌
型2の凹部1に供給してもよい。さらにシート化した線
材を先芯形状に近い状態に予備成形したものを用いても
よい。
The measured wire rod is treated with hot air, irradiated with infrared rays,
A molten mass is produced by an arbitrary heating method using a hot plate or the like, and is supplied to the concave portion 1 (cavity) of the mold. Instead of the above-mentioned weighing method, a wire may be previously heated and melted into a sheet, and the sheet may be cut into a weight similar to that of a single toecap, and the sheet may be supplied to the recess 1 of the female die 2. Further, a sheet-shaped wire rod may be preliminarily molded into a shape close to the toecap shape.

【0018】本発明において使用する線材に用いる熱可
塑性樹脂としては、特に制限はなく、一般に市販されて
いる種々のものが使用可能であるが、含浸性、コストお
よび物性の点からポリオレフィン系樹脂、ポリアミド系
樹脂、ポリエステル系樹脂、ポリカーボネート樹脂、ポ
リフェニレンサルファイド樹脂、ポリスチレン系樹脂が
好適であり、特にポリオレフィン系樹脂、ポリアミド系
樹脂、ポリエステル系樹脂が好適である。
The thermoplastic resin used in the wire used in the present invention is not particularly limited, and various commercially available products can be used, but from the viewpoint of impregnating property, cost and physical properties, a polyolefin resin, Polyamide-based resin, polyester-based resin, polycarbonate resin, polyphenylene sulfide resin, and polystyrene-based resin are preferable, and polyolefin-based resin, polyamide-based resin, and polyester-based resin are particularly preferable.

【0019】ポリオレフィン系樹脂としては、例えば、
ポリプロピレン、ポリエチレンなどが好ましい。ポリア
ミド系樹脂としては、例えば、ナイロン6.6、ナイロ
ン6、ナイロン12、MXDナイロンなどが好ましい。
ポリエステル系樹脂としては、例えば、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などが好ま
しい。これらの樹脂には、着色剤、変性剤、酸化防止
剤、耐候剤などの添加剤を混合して用いてもよい。
As the polyolefin resin, for example,
Polypropylene, polyethylene and the like are preferable. As the polyamide resin, for example, nylon 6.6, nylon 6, nylon 12, MXD nylon and the like are preferable.
As the polyester resin, for example, polyethylene terephthalate, polybutylene terephthalate, etc. are preferable. You may mix and use additives, such as a coloring agent, a modifier, an antioxidant, and a weather resistance, to these resins.

【0020】本発明において使用する線材に用いる強化
繊維としては、ガラス繊維、炭素繊維、アラミド繊維、
セラミック繊維などを単独あるいは併用して使用するこ
とができる。中でもガラス繊維はコストパフォーマンス
に優れているため好ましい。これらの強化繊維は、モノ
フィラメントの平均径が6〜23μmであることが好ま
しく、より好ましくは10〜17μmである。モノフィ
ラメントの平均径が6μm未満の場合は上記線材がコス
ト高になり、23μmを超える場合は、上記線材が機械
的物性が劣るため好ましくない。
The reinforcing fibers used in the wire used in the present invention include glass fibers, carbon fibers, aramid fibers,
Ceramic fibers and the like can be used alone or in combination. Among them, glass fiber is preferable because it has excellent cost performance. The average diameter of the monofilaments of these reinforcing fibers is preferably 6 to 23 μm, more preferably 10 to 17 μm. If the average diameter of the monofilament is less than 6 μm, the cost of the wire becomes high, and if it exceeds 23 μm, the mechanical properties of the wire become poor, which is not preferable.

【0021】また、線材を得るための強化繊維ストラン
ドは、100〜2,000本、より好ましくは200〜
1,600本のモノフィラメントを集束したものであ
る。集束するモノフィラメントが、100本未満である
と、後工程において多数本の線材が必要となるため作業
が煩雑となり、一方、2,000本を超えると、強化繊
維ストランドが太くなるため、熱可塑性樹脂をモノフィ
ラメント間にまで均一に含浸させることが困難になると
ともに、得られた線材が太くなり、応力集中が起こり易
く、圧縮や衝撃強度が劣り好ましくない。
The reinforcing fiber strand for obtaining the wire is 100 to 2,000, more preferably 200 to 2,000.
It is a bundle of 1,600 monofilaments. If the number of monofilaments to be bundled is less than 100, the work becomes complicated because a large number of wire rods are required in the post-process, while if it exceeds 2,000, the reinforcing fiber strands become thick, and thus the thermoplastic resin It becomes difficult to uniformly impregnate the monofilament between the monofilaments, the obtained wire becomes thick, stress concentration easily occurs, and compression and impact strength are poor, which is not preferable.

【0022】本発明に用いる線材は、上記のような強化
繊維ストランドに上記のような熱可塑性樹脂を含浸させ
て製造されるが、以下に挙げる特徴を有する。ここでい
う線材とは、断面円形または断面楕円形状のものや、扁
平なテープ状のものを指す。このうち断面円形または断
面楕円形状の線材は、線材の計量に当たり、その流れが
比較的良好で計量性に優れる。また、線材を溶融させる
場合にも線材をランダムに配向させやすく、均一に強化
繊維が分散された溶融塊(先芯)が得られやすい。ここ
で断面円形または断面楕円形とは、断面の長径/短径が
少なくとも3以下であるような形態を意味する。
The wire used in the present invention is manufactured by impregnating the above-mentioned reinforcing fiber strand with the above-mentioned thermoplastic resin, and has the following characteristics. The wire rod here means one having a circular or elliptical cross section or a flat tape. Among them, a wire having a circular cross section or an elliptical cross section has a relatively good flow and excellent metering property when measuring the wire. Also, when the wire is melted, the wire is easily oriented randomly, and a molten mass (toecap) in which the reinforcing fibers are uniformly dispersed is easily obtained. Here, the circular cross section or the elliptical cross section means a form in which the major axis / minor axis of the cross section is at least 3 or less.

【0023】また、本発明で使用する線材の平均径また
は幅は、特に限定されないが、0.1〜5mmであるこ
とが好ましく、このうち前記断面円形または断面楕円形
状の線材を用いる場合は、その平均径または幅は0.1
〜1.5mmであることが好ましく、0.2〜1.0m
mであることがより好ましい。これにより、線材の計量
および溶融工程で線材を均一に分散させることができ、
得られる先芯の強度が均一となる。上記原料線材の平均
径が1.5mmを超えると、圧縮や衝撃強度が低くなる
ため、先芯の肉厚を厚くする必要があり、結果として先
芯の重量が増加し好ましくない。また、平均径が0.1
mm未満であると、線材の散布時に嵩高になり計量性や
取扱い性が劣る。
The average diameter or width of the wire used in the present invention is not particularly limited, but it is preferably 0.1 to 5 mm, and when the wire having a circular or elliptical cross section is used, Its average diameter or width is 0.1
~ 1.5 mm is preferred, 0.2-1.0 m
More preferably m. As a result, the wire can be uniformly dispersed in the process of measuring and melting the wire,
The strength of the obtained toecap becomes uniform. If the average diameter of the raw material wire exceeds 1.5 mm, the compression and impact strength will be low, so it is necessary to increase the wall thickness of the toecap, which results in an increase in the weight of the toecap, which is not preferable. The average diameter is 0.1
If it is less than mm, it becomes bulky at the time of spraying the wire and the meterability and handleability are poor.

【0024】前記線材の強化繊維の含有率は15〜80
vol%が好ましく、より好ましくは40〜70vol
%である。強化繊維の含有率が15vol%未満の場合
は、先芯の補強効果が低く、80vol%を超える場合
は、繊維を包むマトリックス(熱可塑性樹脂)の量が少
なすぎ、線材同士の接着が劣り、強度低下を招くととも
に、後述する含浸率を95%以上に確保することが困難
となる。
The reinforcing fiber content of the wire is 15-80.
vol% is preferable, and more preferably 40 to 70 vol.
%. When the content of the reinforcing fibers is less than 15 vol%, the reinforcing effect of the toecap is low, and when it exceeds 80 vol%, the amount of the matrix (thermoplastic resin) that wraps the fibers is too small, and the adhesion between the wire materials is poor. In addition to lowering the strength, it becomes difficult to secure the impregnation rate described below at 95% or more.

【0025】前記線材の熱可塑性樹脂の含浸率が95%
以上であることが好ましい。このようにすると線材がモ
ノフィラメントレベルまで熱可塑性樹脂が含浸されてい
るため、得られる先芯の機械的強度が向上し、未含浸に
よる強化繊維の浮き出し、毛羽立ちを防止することが可
能となる。熱可塑性樹脂の含浸率が95%未満である
と、上記問題とともに空隙部が欠陥となりやすく、先芯
において均一な機械的特性が得られなくなる。
The impregnation rate of the thermoplastic resin of the wire is 95%.
The above is preferable. In this case, since the wire rod is impregnated with the thermoplastic resin up to the monofilament level, the mechanical strength of the obtained toecap is improved, and it becomes possible to prevent the reinforced fiber from rising and fluffing due to the impregnation. When the impregnation rate of the thermoplastic resin is less than 95%, voids are likely to become defective along with the above problems, and uniform mechanical properties cannot be obtained in the toecap.

【0026】なお、本発明における含浸率とは、線材の
断面を200倍の電子顕微鏡で観察し、20μmのメッ
シュをおいて、メッシュ中に少しでもボイド(空気の
泡)が認められれば、このメッシュをボイド面積として
加え、観察した全断面積とボイド面積とから以下の数式
によって求めたものである。 {(全断面積−ボイド面積)/全断面積}×100
(%)
The term "impregnation rate" in the present invention means that when a cross section of a wire is observed with an electron microscope at a magnification of 200 and a 20 μm mesh is placed and a void (air bubble) is recognized in the mesh, this A mesh is added as a void area, and it is obtained by the following mathematical formula from the observed total cross-sectional area and the void area. {(Total cross-sectional area-void area) / total cross-sectional area} x 100
(%)

【0027】線材の平均長は5〜50mmが必要であ
る。好ましくは10〜30mmである。平均長が5mm
未満の場合には、先芯に必要な重量に適合するように正
確に計量することが可能であるが、強化繊維が短いた
め、得られる先芯の強度が不足する。一方、50mmを
超える場合は、前記計量性に劣り好ましくないうえに、
溶融物の流れが悪くなる。線材の平均径または幅(D)
と平均長(L)の比(L/D)が30〜80であること
が好ましい。これにより、前記計量性が優れるうえに得
られる先芯中に強化繊維が均一に分散し易くなり、先芯
の強度を向上させることができる。
The average length of the wire is required to be 5 to 50 mm. It is preferably 10 to 30 mm. Average length is 5mm
When it is less than the above range, it is possible to accurately measure the weight so as to fit the weight required for the toecap, but the strength of the toecap obtained is insufficient because the reinforcing fiber is short. On the other hand, when it exceeds 50 mm, it is not preferable because the above-mentioned weighing property is poor and
Melt flow is poor. Average diameter or width of wire (D)
And the ratio (L / D) of the average length (L) is preferably 30 to 80. This makes it easy to uniformly disperse the reinforcing fibers in the obtained toecap in addition to the excellent metering property, thereby improving the strength of the toecap.

【0028】本発明に用いる線材を作製する方法は、特
に限定しないが、一方向に強化繊維を引き揃えて熱可塑
性樹脂を含浸させながらシート状にした後、スリットを
入れてテープ材を作成した後、所望の長さに切断する方
法や、1本または複数本の強化繊維に熱可塑性樹脂を溶
融含浸させながらダイを通し、所望の形状のノズルか
ら、断面円形または断面楕円形状に引き抜き被覆したも
のや、扁平なテープ状にして引き抜き、所望の長さに切
断するといった方法が挙げられる。
The method for producing the wire used in the present invention is not particularly limited, but the reinforcing fiber is aligned in one direction and impregnated with the thermoplastic resin to form a sheet, which is then slit to form a tape material. After that, a method of cutting into a desired length, or a method in which one or a plurality of reinforcing fibers are melt-impregnated with a thermoplastic resin, passed through a die, and drawn out from a nozzle having a desired shape into a circular cross section or an elliptical cross section for coating. There is a method of making a flat tape, pulling it out, and cutting it into a desired length.

【0029】上記線材を作成するうえでの作業性、線材
の溶融性、均一分散性、先芯の強度などを勘案すると、
断面円形または断面楕円形の線材が好ましい。この断面
円形または断面楕円形の線材を作成する好適な方法とし
ては、強化繊維ストランドを樹脂含浸槽に送り込み、溶
融含浸法により樹脂を含浸させた後、1本または複数本
の強化繊維ストランドをひとつのノズルから引き抜き、
所定の長さに切断して得る方法が好ましい。さらに、ス
プリットを施すことなく集束した1本の強化繊維ストラ
ンドをひとつのノズルから引き抜く方法を採用すると、
ノズルからの引き抜きが容易となり、強化繊維の含有率
を高めることができ、かつ毛羽の発生を少なくすること
ができる。この方法では、径の小さい線材を比較的容易
に得ることができるため、前記L/Dを30〜80にす
ることが容易になる。
Considering workability in preparing the above wire, meltability of the wire, uniform dispersibility, strength of the toecap, and the like,
A wire having a circular cross section or an elliptical cross section is preferable. A preferable method for producing the wire having a circular cross section or an elliptical cross section is to feed the reinforcing fiber strands into a resin impregnation tank, impregnate the resin by a melt impregnation method, and then to add one or more reinforcing fiber strands one by one. From the nozzle of
A method of obtaining by cutting to a predetermined length is preferable. Furthermore, if a method of pulling out one bundle of reinforced fiber without splitting from one nozzle is adopted,
It can be easily pulled out from the nozzle, the content of reinforcing fibers can be increased, and the occurrence of fluff can be reduced. With this method, a wire having a small diameter can be obtained relatively easily, so that it becomes easy to set the L / D to 30 to 80.

【0030】本発明の製造方法においては、上述した特
徴を有する線材を、所望重量に計量し、例えば、コンベ
アなどの上に集積し、加熱炉中に導き、熱風、赤外線照
射、加熱板などで加熱し、溶融塊を作製し、図3に示す
ように4個の凹部1に挿入し、不図示の雄型を下降させ
てプレス成形する。この成形の際に、4個の溶融塊が全
て所定の重量であることが理想であるが、実際には多少
のバラツキが発生している。このバラツキは前記のよう
にノックピン5の上下動によって補正され、成形される
4個の先芯の強度(密度)は均質化され、バリの多い先
芯や強度不足の先芯の発生率が著しく減少し、先芯の生
産性が著しく向上する。以上の如き本発明の製造方法に
よれば、得られた先芯の重量の100個当たりの重量の
ばらつきが最大と最小とで2g以下とすることが可能で
ある。
In the manufacturing method of the present invention, the wire having the above-mentioned characteristics is weighed to a desired weight, accumulated on, for example, a conveyor, introduced into a heating furnace, and heated with hot air, infrared rays, a heating plate, or the like. It is heated to produce a molten mass, which is inserted into four recesses 1 as shown in FIG. 3, and a male die (not shown) is lowered to perform press molding. At the time of this molding, it is ideal that all four molten masses have a predetermined weight, but in reality, some variation occurs. This variation is corrected by the vertical movement of the knock pin 5 as described above, the strength (density) of the four molded toecaps is homogenized, and the occurrence rate of the toecaps with many burrs and the toecaps with insufficient strength is remarkable. And the productivity of the toe box is significantly improved. According to the manufacturing method of the present invention as described above, it is possible to make the variation in weight per 100 pieces of the obtained toe cores 2 g or less between the maximum and the minimum.

【0031】[0031]

【実施例】以下、実施例および比較例を挙げて本発明を
さらに詳しく説明する。 実施例1 平均径13μmのモノフィラメントを用いて、スプリッ
トをかけずに集束本数を600本とした1本のガラス繊
維ストランドを、MI=40の酸変性した溶融ポリプロ
ピレン(溶融温度260℃)中に導入し、溶融含浸を行
った後、内径0.45mmのノズルから50m/min
の速度で引き抜き、ほぼ断面円形の線材を得た。得られ
た線材の平均径は0.45mm、ガラス含有率は50v
ol%、含浸率はn=5の平均値で100%であった。
nは測定個数を表わす(以下同じ)。
EXAMPLES The present invention will be described in more detail with reference to Examples and Comparative Examples. Example 1 Using a monofilament having an average diameter of 13 μm, one glass fiber strand having 600 bundles without splitting was introduced into acid-modified molten polypropylene with MI = 40 (melting temperature 260 ° C.). Then, after performing melt impregnation, 50 m / min from a nozzle with an inner diameter of 0.45 mm
The wire rod having a substantially circular cross section was obtained by pulling out at a speed of. The obtained wire material has an average diameter of 0.45 mm and a glass content of 50 v.
The ol% and the impregnation rate were 100% as an average value of n = 5.
n represents the number of measurements (hereinafter the same).

【0032】なお、ガラス含有率の測定は、まず得られ
た線材を600℃の電気炉中で加熱して樹脂を焼失させ
た後、残ったガラスの重量を測定して、ガラス含有率7
5重量%の測定値を得た。この値から樹脂の比重を0.
91、ガラス繊維の比重を2.54としてvol%に換
算した。
The glass content was measured by first heating the obtained wire in an electric furnace at 600 ° C. to burn off the resin, and then measuring the weight of the remaining glass to obtain a glass content of 7
A measured value of 5% by weight was obtained. From this value, the specific gravity of the resin is
91, the specific gravity of the glass fiber was set to 2.54 and converted to vol%.

【0033】次いで、この線材をペレタイザーで長さが
20mmとなるように切断して短線材を作製し、得られ
た短線材を株式会社イシダ製の計量器NES−202W
T(商品名)の改造機にて線材を48g一度に計量し、
同じ線材を少量づつ追加して50gを連続的に計量し、
この計量塊をベルトコンベアを用いて熱風溶融炉に導
き、4個の溶融塊を作製した。4個の溶融塊を図3に示
す雌型2の4個の凹部1に挿入し、不図示の雄型を下降
させてプレス成形を行なった、この際の雌型2は約90
〜110℃に加熱されている。
Next, this wire rod is cut with a pelletizer to a length of 20 mm to prepare a short wire rod, and the obtained short wire rod is a weighing machine NES-202W manufactured by Ishida Co., Ltd.
Weigh 48g of wire at a time with a T (brand name) remodeling machine,
Add the same wire little by little and weigh 50g continuously,
This weighed mass was introduced into a hot air melting furnace using a belt conveyor to prepare four molten masses. The four molten masses were inserted into the four recesses 1 of the female die 2 shown in FIG. 3, and the male die (not shown) was lowered to perform press molding.
It is heated to ~ 110 ° C.

【0034】30秒間経過後、雄型を上昇させるととも
にノックピン5により成形物を脱型した。この時の雌型
2の弾性体は、厚さ5mmのNBRを使用し、ノックピ
ンについては直径8mm、長さ100mmを使用した。
不図示の雄型として川崎油工株式会社製の1000kN
プレス機にてプレス成形した。得られた4個の先芯(
〜)にはバリが殆ど発生しておらず、得られた先芯の
強度試験を行なったところ、表1に示す結果が得られ
た。
After the lapse of 30 seconds, the male mold was lifted and the molded product was demolded by the knock pin 5. At this time, an NBR having a thickness of 5 mm was used as the elastic body of the female mold 2, and a knock pin having a diameter of 8 mm and a length of 100 mm was used.
1000kN made by Kawasaki Yuko Co., Ltd. as a male type not shown
It press-molded with the press machine. The four toecaps obtained (
Almost no burrs were generated in (-), and the strength test of the obtained toecap was conducted, and the results shown in Table 1 were obtained.

【0035】試験試料のとしては、それぞれ得られた4
個(〜)の先芯を安全靴に組み込み、ダイレクトイ
ンジェクション法によって4個のポリウレタン2層式安
全靴を作製した。試験方法としては、これらの安全靴を
JIS T 8101の普通作業用S種の規格に従い、
株式会社島津製作所製のオートグラフにより圧迫荷重を
負荷し、1020kgf負荷時の圧迫試験後の先芯と中
底の残存高さを油粘土にて測定した。
As the test sample, 4 samples were obtained.
Four (2) polyurethane two-layer safety shoes were manufactured by incorporating the toe cores (-) into the safety shoes and using the direct injection method. As a test method, these safety shoes were tested in accordance with JIS T 8101 S type for normal work,
A compression load was applied by an autograph manufactured by Shimadzu Corporation, and the residual heights of the toecap and the insole after the compression test under a load of 1020 kgf were measured with an oil clay.

【0036】実施例2 本発明の効果を確認するために、実施例1に記載の計量
器で4回計量して下記の重量の線材集合体を得た。 50.0g 50.0g 49.3g 49.
9g 上記の線材集合体を用いて実施例1と同様に先芯を成形
したところ、何れもバリの発生は殆どなかった。成形物
を見ると、、およびの場合のノックピン5の当接
部は平坦であり、の場合にはノックピン5の当接部は
深さ約0.5mmの凹部が認められた。これらについて
実施例1と同様にして試験試料を作製し、強度を測定し
たところ表1に示す結果が得られた。
Example 2 In order to confirm the effects of the present invention, the weighing machine described in Example 1 was weighed four times to obtain a wire rod assembly having the following weight. 50.0 g 50.0 g 49.3 g 49.
9 g When a toecap was molded using the above wire rod assembly in the same manner as in Example 1, almost no burrs were generated. Looking at the molded product, the contact portion of the knock pin 5 in the cases of, and was flat, and in the case of, the contact portion of the knock pin 5 had a recess having a depth of about 0.5 mm. A test sample was prepared from these in the same manner as in Example 1 and the strength was measured. The results shown in Table 1 were obtained.

【0037】実施例3 ノズル径を0.53mmに変えた以外は実施例1と同様
の方法で線材を得た。得られた線材の平均径は0.53
mm、ガラス含有率は45.5vol%、含浸率はn=
5の平均値で99%であった。次いで、この線材をペレ
タイザーで長さが20mmとなるように切断し短線材を
作製した。この線材を用いて実施例1と同様に4個(
〜)先芯を成形した。成形された先芯に何らの処理も
加えずにその重量を測定したところ、実際には49.7
g(、)であったが、最小重量は49.1g()
であり、最高重量は50.0g()であった。また、
実施例1と同様に得られた先芯の強度を測定したところ
実施例1とほぼ同様であった。
Example 3 A wire rod was obtained in the same manner as in Example 1 except that the nozzle diameter was changed to 0.53 mm. The average diameter of the obtained wire rod is 0.53
mm, glass content 45.5 vol%, impregnation rate n =
The average value of 5 was 99%. Next, this wire rod was cut with a pelletizer to a length of 20 mm to produce a short wire rod. Using this wire rod, 4 pieces (
~) A toecap was molded. When the weight of the molded toecap was measured without any treatment, it was actually 49.7.
g (,), but the minimum weight is 49.1 g ()
And the maximum weight was 50.0 g (). Also,
When the strength of the toe cap obtained in the same manner as in Example 1 was measured, it was almost the same as in Example 1.

【0038】比較例1 本発明の効果を確認するために、実施例1に記載の計量
器で下記の4種の線材集合体を得た。 49.8g 49.9g 49.1g 49.
9g 上記の線材集合体を用いて、図3において弾性板を有さ
ない以外は実施例1と同じ金型を用いて実施例1と同様
に先芯を成形したところ、との場合はバリが発生し
たが、他の場合はバリの発生はなかった。これらについ
て実施例1と同様にして試験試料を作製し、強度を測定
したところ表1に示す結果が得られた。特にのものは
強度が不足であった。
Comparative Example 1 In order to confirm the effect of the present invention, the following four kinds of wire rod assemblies were obtained with the weighing machine described in Example 1. 49.8 g 49.9 g 49.1 g 49.
9 g Using the above wire rod assembly and molding a toe core in the same manner as in Example 1 using the same mold as that in Example 1 except that the elastic plate is not provided in FIG. 3, in the case of It occurred, but in other cases, no burr was generated. A test sample was prepared from these in the same manner as in Example 1 and the strength was measured. The results shown in Table 1 were obtained. In particular, the strength was insufficient.

【0039】 以上の結果は、本発明の方法によれば、溶融塊の量が多
少不足しても強度が落ちない先芯が得られる(実施例2
の、実施例3の)のに対して、本発明によらない比
較例では、溶融塊の重量が不足()すると先芯の強度
が有意に低下したことを示している。
[0039] From the above results, according to the method of the present invention, it is possible to obtain a toecap in which the strength is not deteriorated even if the amount of the molten mass is slightly insufficient (Example 2).
In contrast to Example 3), the comparative example not according to the present invention shows that when the weight of the molten mass is insufficient (), the strength of the toecap significantly decreases.

【0040】[0040]

【発明の効果】以上の如き本発明によれば、4個以上か
つ偶数個の凹部(キャビティ)を有する金型であって、
複数の凹部に多少異なる量の樹脂原料が供給されても、
均一品質で強度に優れた先芯を効率よく生産できる金型
および先芯の製造方法を提供することができる。
According to the present invention as described above, a mold having four or more and an even number of recesses (cavities) is provided.
Even if a slightly different amount of resin material is supplied to the plurality of recesses,
It is possible to provide a mold and a method of manufacturing a toecap that can efficiently produce a toecap of uniform quality and excellent strength.

【図面の簡単な説明】[Brief description of drawings]

【図1】 図3のA−B線断面図。1 is a cross-sectional view taken along the line AB of FIG.

【図2】 図3のA−A’線断面図。FIG. 2 is a sectional view taken along the line A-A ′ of FIG.

【図3】 本発明の金型の一部切り欠き斜視図。FIG. 3 is a partially cutaway perspective view of a mold of the present invention.

【符号の説明】[Explanation of symbols]

1:凹部 2:雌型 3:凸部 4:雄型 5:ノックピン 6:弾性体 7:樹脂原料 8:先芯 9:加熱板 10:雄型上下動のガイド孔 11:ノックピン上下動のガイド 12:雄型にチェインで係合する係合部 100:金型 1: recess 2: Female 3: convex part 4: Male 5: Dowel pin 6: Elastic body 7: Resin raw material 8: Toecap 9: Heating plate 10: Male vertical guide hole 11: Guide for vertical movement of knock pin 12: Engagement part that engages with male type in a chain 100: Mold

───────────────────────────────────────────────────── 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) // B29K 105:06 B29L 31:50 B29L 31:50 A43B 10/00 101A (72)発明者 福沢 剛男 東京都文京区本郷3丁目20番1号 株式会 社シモン内 (72)発明者 富永 真彦 東京都千代田区神田鍛冶町3丁目6番地3 旭ファイバーグラス株式会社内 (72)発明者 尾崎 憲吾 東京都千代田区神田鍛冶町3丁目6番地3 旭ファイバーグラス株式会社内 Fターム(参考) 4F050 AA01 AA06 BC01 BF06 HA21 HA71 JA23 KA10 KA11 KA16 LA01 LA02 NA02 NA52 NA54 NA62 4F202 AA11 AB16 AB25 AD04 AD16 AH67 AM33 CA09 CB01 CK07 CK52 CK89 4F204 AA11 AB16 AD04 AD16 AH67 AM33 FA01 FB01 FE06 FQ15─────────────────────────────────────────────────── ─── Continuation of front page (51) Int.Cl. 7 Identification code FI theme code (reference) // B29K 105: 06 B29L 31:50 B29L 31:50 A43B 10/00 101A (72) Inventor Takeo Fukuzawa Tokyo 3-20-1, Hongo, Bunkyo-ku, Tokyo Stock company Simon (72) Inventor Masahiko Tominaga 3-6-6 Kanda Blacksmith Town, Chiyoda-ku, Tokyo 3 Asahi Fiber Glass Co., Ltd. (72) Inventor Kengo Ozaki Chiyoda, Tokyo 3-6-3 Kanda-Kaimachi, Ku-ku F-Term in Asahi Fiber Glass Co., Ltd. (reference) 4F050 AA01 AA06 BC01 BF06 HA21 HA71 JA23 KA10 KA11 KA16 LA01 LA02 NA02 NA52 NA54 NA62 4F202 AA11 AB16 AB25 AD04 AD16 AH67 AM33 CA09 CB01 CK07 CK07 CK89 CK07 CK89 CK89 4F204 AA11 AB16 AD04 AD16 AH67 AM33 FA01 FB01 FE06 FQ15

Claims (11)

【特許請求の範囲】[Claims] 【請求項1】 安全靴の先芯の外面形状と一致する内面
を有する凹部を備えた雌型と、安全靴先芯の内面形状と
一致する外面を有する凸部を備えた雄型と、成形された
安全靴先芯を脱型するノックピンとを有する安全靴先芯
成形用金型において、上記ノックピンが成形時の圧力に
よって下降または上昇するように構成されていることを
特徴とする安全靴先芯成形用金型。
1. A female mold having a concave portion having an inner surface matching the outer surface shape of a toe core of a safety shoe, and a male mold having a convex portion having an outer surface matching the inner surface shape of a safety shoe toecap, and molding. In a safety shoe toe core molding die having a knock pin for removing the safety shoe toe core from the safety shoe, characterized in that the knock pin is configured to be lowered or raised by pressure during molding. Mold for core molding.
【請求項2】 ノックピンの下端が弾性体に当接してい
る請求項1に記載の安全靴先芯成形用金型。
2. The safety shoe toecap molding die according to claim 1, wherein the lower end of the knock pin is in contact with the elastic body.
【請求項3】 1個の雌型が、上記の凹部とノックピン
との組み合わせを4個以上有し、一個の雄型が、雌型の
キャビティに相当する数の、安全靴先芯の内面形状と一
致する外面を有する凸部を備えている請求項1に記載の
安全靴先芯成形用金型。
3. One female mold has four or more combinations of the above-mentioned recesses and knock pins, and one male mold has the number of inner surface shapes of the safety shoe toecaps corresponding to the female mold cavity. The safety shoe toecap molding die according to claim 1, further comprising a convex portion having an outer surface corresponding to the above.
【請求項4】 4個以上の凹部の形状が、それぞれ2個
ずつ鏡像体状に配置されている請求項3に記載の安全靴
先芯成形用金型。
4. The safety shoe toecap molding die according to claim 3, wherein four or more concave portions are arranged in a shape of two mirror images each.
【請求項5】 4個以上のノックピンの下端が、共通し
た弾性体に当接している請求項3に記載の安全靴先芯成
形用金型。
5. The safety shoe toecap molding die according to claim 3, wherein the lower ends of the four or more knock pins are in contact with a common elastic body.
【請求項6】 請求項1〜5のいずれか1項に記載の安
全靴先芯成形用金型の凹部に、溶融または軟化した繊維
強化熱可塑性樹脂を挿入し、雄型の凸部を雌型の凹部に
圧入して繊維強化熱可塑性樹脂を安全靴先芯形状に成形
し、ノックピンにより脱型することを特徴とする安全靴
先芯の製造方法。
6. A molten or softened fiber-reinforced thermoplastic resin is inserted into the concave portion of the safety shoe toecap molding die according to any one of claims 1 to 5, and the convex portion of the male die is inserted into the female die. A method for manufacturing a safety shoe toecap, comprising press-fitting into a recess of a mold to mold a fiber-reinforced thermoplastic resin into a safety shoe toecap shape, and removing the mold with a knock pin.
【請求項7】 溶融または軟化した繊維強化熱可塑性樹
脂が、該樹脂の溶融塊、該樹脂からなるシートまたは該
樹脂からなる予備成形体である請求項6に記載の安全靴
先芯の製造方法。
7. The method for producing a safety shoe toecap according to claim 6, wherein the melted or softened fiber-reinforced thermoplastic resin is a molten mass of the resin, a sheet made of the resin, or a preform made of the resin. .
【請求項8】 繊維強化熱可塑性樹脂が、幅0.1〜5
mmおよび長さ5〜50mmの一方向長繊維強化熱可塑
性樹脂からなる線材である請求項6に記載の安全靴先芯
の製造方法。
8. The fiber-reinforced thermoplastic resin has a width of 0.1 to 5
mm and a length of 5 to 50 mm, which is a wire rod made of a unidirectional long fiber reinforced thermoplastic resin.
【請求項9】 請求項8に記載の線材の重量を計量して
使用するに当たり、所定重量よりも少ない重量を一度に
計量し、次いで少量を追加計量して所定重量に計量し、
溶融または軟化させて成形機に供給する請求項7に記載
の安全靴先芯の製造方法。
9. When weighing and using the wire rod according to claim 8, a weight less than a predetermined weight is measured at a time, and then a small amount is additionally weighed to a predetermined weight,
The method for producing a safety shoe toecap according to claim 7, wherein the safety shoe toecap is melted or softened and supplied to a molding machine.
【請求項10】 請求項4に記載の金型の凹部に配置す
る繊維強化熱可塑性樹脂の重量が、最大量の繊維強化熱
可塑性樹脂の重量と最小量の繊維強化熱可塑性樹脂の重
量との差が2g以内である請求項6に記載の安全靴先芯
の製造方法。
10. The weight of the fiber reinforced thermoplastic resin disposed in the recess of the mold according to claim 4 is the maximum weight of the fiber reinforced thermoplastic resin and the minimum weight of the fiber reinforced thermoplastic resin. The method for producing a safety shoe toecap according to claim 6, wherein the difference is within 2 g.
【請求項11】 請求項6〜10のいずれか1項に記載
された方法によって得られた安全靴先芯の重量の100
個当たりの重量のばらつきが最大と最小とで2g以下で
あることを特徴とする安全靴先芯。
11. The weight of the safety shoe toecap obtained by the method according to claim 6 is 100.
A safety shoe toecap having a maximum and minimum variation in weight per piece of 2 g or less.
JP2001234820A 2001-08-02 2001-08-02 Mold for molding toe box of safety shoes and method for manufacturing the toe box of the safety shoes Pending JP2003039460A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2001234820A JP2003039460A (en) 2001-08-02 2001-08-02 Mold for molding toe box of safety shoes and method for manufacturing the toe box of the safety shoes

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2001234820A JP2003039460A (en) 2001-08-02 2001-08-02 Mold for molding toe box of safety shoes and method for manufacturing the toe box of the safety shoes

Publications (1)

Publication Number Publication Date
JP2003039460A true JP2003039460A (en) 2003-02-13

Family

ID=19066361

Family Applications (1)

Application Number Title Priority Date Filing Date
JP2001234820A Pending JP2003039460A (en) 2001-08-02 2001-08-02 Mold for molding toe box of safety shoes and method for manufacturing the toe box of the safety shoes

Country Status (1)

Country Link
JP (1) JP2003039460A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107364082A (en) * 2017-08-30 2017-11-21 联荣(清远)模具制造有限公司 A kind of rubber projects mould

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107364082A (en) * 2017-08-30 2017-11-21 联荣(清远)模具制造有限公司 A kind of rubber projects mould

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