JPH08318561A - Resin plasticizing screw - Google Patents
Resin plasticizing screwInfo
- Publication number
- JPH08318561A JPH08318561A JP7128032A JP12803295A JPH08318561A JP H08318561 A JPH08318561 A JP H08318561A JP 7128032 A JP7128032 A JP 7128032A JP 12803295 A JP12803295 A JP 12803295A JP H08318561 A JPH08318561 A JP H08318561A
- Authority
- JP
- Japan
- Prior art keywords
- screw
- plasticizing
- resin
- fiber
- compression
- 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.)
- Withdrawn
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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/50—Details of extruders
- B29C48/505—Screws
- B29C48/53—Screws having a varying channel depth, e.g. varying the diameter of the longitudinal screw trunk
-
- 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
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
- B29C48/362—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using static mixing devices
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、射出成形機、押出成形
機等に適用され、長繊維と熱可塑化樹脂との組成物から
構成されている樹脂成形ペレットの可塑化・溶融を行う
ための可塑化スクリュに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is applied to an injection molding machine, an extrusion molding machine, etc. for plasticizing and melting resin molded pellets composed of a composition of long fibers and a thermoplastic resin. Of plasticizing screws of.
【０００２】[0002]
【従来の技術】射出成形機、押出成形機等により成形さ
れる熱可塑性樹脂の成形材料は、一般にペレット状で供
給されるものが多く、このペレットを可塑化・溶融する
方法として、射出成形機、押出成形機、等のプラスチッ
ク成形機においては、加熱円筒中に挿入されたスクリュ
を用いる方法が提供されている。このうち、射出成形に
使用されている可塑化スクリュは、通常、供給部、圧縮
部、計量部から構成されており、主に圧縮部において上
記ペレットに大きな剪断を作用させペレットの可塑化・
溶融を促進させている。2. Description of the Related Art Many thermoplastic resin molding materials molded by an injection molding machine, an extrusion molding machine or the like are generally supplied in the form of pellets. As a method for plasticizing and melting the pellets, an injection molding machine is used. In a plastic molding machine such as an extrusion molding machine, a method using a screw inserted in a heating cylinder is provided. Of these, the plasticizing screw used for injection molding is usually composed of a feeding section, a compressing section, and a measuring section. Mainly in the compressing section, a large shearing force is applied to the pellet to plasticize the pellet.
It promotes melting.
【０００３】また、特に射出成形において、各種成形品
の機械的物性などを向上させるため、ガラス繊維等の繊
維強化材を使用する技術は以前から知られているが、近
年、特に長繊維を含む熱可塑性樹脂を成形材料に使用し
た射出成形が注目されている。これは、成形品中の繊維
強化材の長さが長いほど成形品の強度、剛性、耐衝撃
性、などが向上するとともに、さらに、廉価な熱可塑性
樹脂を用いて上記のように機械的物性に優れた成形品を
得ることができれば、構造部材や機能部品の製造コスト
を大幅に低減できるためである。Further, in injection molding, in particular, a technique of using a fiber reinforced material such as glass fiber has been known for a long time in order to improve mechanical properties of various molded products, but in recent years, particularly long fibers have been contained. Injection molding using a thermoplastic resin as a molding material is drawing attention. This is because the strength, rigidity, impact resistance, etc. of the molded product are improved as the length of the fiber reinforced material in the molded product is increased, and further, the mechanical properties as described above are obtained by using an inexpensive thermoplastic resin. This is because if excellent molded products can be obtained, the manufacturing costs of structural members and functional parts can be significantly reduced.
【０００４】長繊維を含む熱可塑性樹脂の成形材料（以
下、長繊維強化熱可塑性樹脂と略称する）は、繊維強化
材を含まない通常の熱可塑性樹脂の成形材料と同様にペ
レット状で供給されることが多いが、この場合、長軸の
ペレットとなる。上記長繊維強化熱可塑性樹脂を用いた
射出成形で最も重要な点は、長軸ペレットを可塑化・溶
融させる過程で、ガラス繊維（以降、ＧＦと称する）等
の繊維強化材を切断させないことである。繊維強化材の
切断が著しくなると、成形品の機械的物性等を向上させ
るという観点から、成形材料として長繊維強化熱可塑性
樹脂を用いる利点がなくなる。A molding material of a thermoplastic resin containing long fibers (hereinafter abbreviated as a long fiber reinforced thermoplastic resin) is supplied in the form of pellets like a molding material of a normal thermoplastic resin containing no fiber reinforcement. In this case, long-axis pellets are formed. The most important point in the injection molding using the long fiber reinforced thermoplastic resin is that the fiber reinforced material such as glass fiber (hereinafter referred to as GF) is not cut in the process of plasticizing and melting the long axis pellets. is there. If the fiber reinforced material is severely cut, the advantage of using the long fiber reinforced thermoplastic resin as the molding material is lost from the viewpoint of improving the mechanical properties and the like of the molded product.
【０００５】上記長繊維強化熱可塑性樹脂の射出成形に
おいて、長軸ペレットを可塑化・溶融させるためのスク
リュとして、従来は、繊維強化されていない通常の熱可
塑性樹脂に用いるものと同様のスクリュを使用する場合
が多かった。In the injection molding of the above-mentioned long-fiber-reinforced thermoplastic resin, as a screw for plasticizing and melting the long-axis pellet, a screw similar to that used for a conventional non-fiber-reinforced thermoplastic resin has hitherto been used. Often used.
【０００６】図４は、射出成形に用いられる従来のスク
リュの一般的構造を示す。これは、上記のような繊維強
化されていない熱可塑性樹脂を可塑化・溶融されるため
の射出成形用スクリュの１例である。図において、スク
リュ１は供給部９、圧縮部２、および計量部３から構成
され、さらに、先端には逆流防止機構４（以下、チェッ
クリングと称する）及び円錐形状のスクリュチップ５が
装着されている。FIG. 4 shows the general structure of a conventional screw used in injection molding. This is an example of an injection molding screw for plasticizing and melting the above-mentioned non-fiber-reinforced thermoplastic resin. In the figure, a screw 1 is composed of a supply unit 9, a compression unit 2, and a measuring unit 3, and further, a backflow prevention mechanism 4 (hereinafter referred to as a check ring) and a conical screw tip 5 are attached to the tip. There is.
【０００７】上記スクリュ１の全長は、通常スクリュ全
長Ｌとスクリュの呼び直径Ｄとの比：Ｌ／Ｄ＝１８〜２
５が多いが、成形機の大きさ等によっては、この値以
下、あるいはこの値以上のものもある。また、通常のス
クリュ１の全長に対して、供給部９の長さ：Ｌ1 は最低
でＬ1 ／Ｄ＝７程度、圧縮部２の長さ：Ｌ2 は最大でＬ
2 ／Ｄ＝１１程度のものが多い。さらに、上記スクリュ
１における圧縮比は１．５〜２．５程度であり、スクリ
ュリード：Ｐは通常１Ｄ程度に構成される。尚、図４に
おいて、６はシリンダ、７はペレット投入口である。[0007] The total length of the screw 1 is
Ratio of length L to nominal diameter D of screw: L / D = 18 to 2
5, but depending on the size of the molding machine, etc.
Some are below or above this value. In addition,
The length of the supply unit 9 relative to the total length of the cru 1 is L1Is the lowest
At L1/ D = about 7, the length of the compression unit 2: L2Is at most L
2/ D = 11 or so. In addition, the screw
The compression ratio at 1 is about 1.5 to 2.5, and
Ulead: P is usually configured to be about 1D. In addition, in FIG.
Here, 6 is a cylinder, and 7 is a pellet charging port.
【０００８】[0008]
【発明が解決しようとする課題】しかしながら、射出成
形において、特に、長繊維強化熱可塑性樹脂の長軸ペレ
ットをスクリュ１によって可塑化・溶融させる場合、図
４に示されるような、繊維強化されていない通常の熱可
塑性樹脂の可塑化・溶融に用いられているスクリュ１と
同様のものを使用すると、スクリュ１の供給部９、圧縮
部２、および計量部３において繊維が切断する場合が多
々あった。However, in injection molding, in particular, when the long axis pellets of the long fiber reinforced thermoplastic resin are plasticized and melted by the screw 1, the fiber reinforced as shown in FIG. 4 is used. If a screw similar to the screw 1 used for plasticizing and melting a normal thermoplastic resin is not used, the fiber is often cut in the supply part 9, the compression part 2 and the measuring part 3 of the screw 1. It was
【０００９】上記供給部９においては、長軸ペレットに
圧力が作用している状態で、しかもスクリュ１の回転の
影響を受けるため、固体状態の長軸ペレットには曲げ、
引張り、回転等が複雑に絡みあった力が作用し、その結
果繊維が切断する。また、圧縮部２においては、同圧縮
部２がスクリュ１の軸方向の長さに対して短かかった
り、圧縮比が大きい場合、圧縮部２の始点近傍におい
て、長軸ペレットは、固体状態、あるいは半溶融状態で
急激な圧縮力を受けると同時に、大きな剪断を受けて繊
維が切断する。In the above-mentioned supply unit 9, since the long-axis pellets are under pressure and are influenced by the rotation of the screw 1, the long-axis pellets in the solid state are bent.
A complicated entangled force such as tension and rotation acts, and as a result, the fiber is cut. Further, in the compression unit 2, when the compression unit 2 is shorter than the axial length of the screw 1 or the compression ratio is large, in the vicinity of the starting point of the compression unit 2, the long-axis pellets are in a solid state, Alternatively, in a semi-molten state, the fiber is cut by being subjected to a large shearing force while being subjected to a rapid compressive force.
【００１０】さらに、計量部３においては、溝深さが小
さい場合等に、溶融樹脂や繊維に大きな剪断が作用し
て、繊維が切断する。上記のように、図３に示されるよ
うな従来のスクリュ１による場合は、可塑化・溶融時に
繊維が著しく切断するという不具合が多発し、これによ
り、成形品の長繊維強化材による優れた特性が発揮され
ないという問題点が内在する。Further, in the measuring section 3, when the groove depth is small, the molten resin and the fibers are largely sheared to cut the fibers. As described above, in the case of the conventional screw 1 as shown in FIG. 3, there is often a problem that fibers are significantly cut during plasticization and melting, which results in excellent characteristics of the long fiber reinforcement of the molded product. There is an inherent problem that is not exhibited.
【００１１】本発明の目的は、長繊維と熱可塑化樹脂と
の組成物から構成される樹脂成形ペレットの可塑化・溶
融を行うものにおいて、樹脂中の繊維強化材の剪断切断
の発生を防止して、強度及び剛性が高く、かつ耐衝撃性
も大なる樹脂成形品を得ることである。An object of the present invention is to prevent the occurrence of shear cutting of the fiber reinforcement in the resin in the case of plasticizing and melting a resin molding pellet composed of a composition of long fibers and a thermoplastic resin. Then, a resin molded product having high strength and rigidity and high impact resistance is obtained.
【００１２】[0012]
【課題を解決するための手段】本発明の第１の手段は、
長繊維強化熱可塑性樹脂の可塑化・溶融を行うための可
塑化スクリュにおいて、同スクリュをテーパ状の圧縮部
とこれに延設される計量部のみにて構成して供給部を設
けず、かつ圧縮比を１．０〜２．５と従来のものよりも
小さく構成したことである。The first means of the present invention is to:
In a plasticizing screw for plasticizing and melting a long fiber reinforced thermoplastic resin, the screw is composed only of a tapered compression part and a measuring part extended to this, and a supply part is not provided, and The compression ratio is 1.0 to 2.5, which is smaller than the conventional one.
【００１３】また、本発明の第２の手段は、上記第１の
手段におけるスクリュが、スクリュリード：Ｐ＝１．２
Ｄ〜２．０Ｄ（Ｄはスクリュ呼び直径）に構成されたこ
とである。In the second means of the present invention, the screw in the first means is screw lead: P = 1.2.
D to 2.0D (D is a screw nominal diameter).
【００１４】さらに第３の手段は、圧縮部のスクリュ始
点部の溝深さｈ＝０．１Ｄ〜０．３Ｄ（Ｄは上記と同
様）に構成したことである。A third means is that the groove depth h = 0.1D to 0.3D (D is the same as above) at the screw starting point of the compression section.
【００１５】[0015]
【作用】本発明の第１の手段によれば、スクリュの供給
部を備えず、圧縮部と計量部のみとしているので、限ら
れたスクリュ全長の中で圧縮部の長さが最大限に確保さ
れ、その結果圧縮部の溝深さの変化が緩やかに形成され
ると共に、必要な圧縮比も同時に確保される。これによ
り、樹脂温度などの溶融品質になんら支障なくして、繊
維切断の要因となる剪断、圧縮、引張り等の力を抑制で
き、繊維の切断を低減することができる。According to the first means of the present invention, since the screw supply section is not provided and only the compression section and the metering section are provided, the maximum length of the compression section is ensured within the limited total screw length. As a result, the groove depth of the compression portion is gradually changed, and at the same time, the required compression ratio is secured. As a result, the melt quality such as the resin temperature is not hindered, and the forces such as shearing, compression, and pulling, which cause the fiber cutting, can be suppressed, and the fiber cutting can be reduced.
【００１６】また、第２の手段によれば、スクリュリー
ドを従来のものよりも大きくしているので、特に計量部
において、繊維を含んだ溶融樹脂のスクリュ１回転あた
りの進み量が大きくなり、その結果、従来スクリュと同
様のスクリュ直径、および回転数において、繊維が剪断
を受けている時間（全剪断量：剪断速度と時間の積）が
短くなり、これによっても、繊維の切断を低減できる。Further, according to the second means, since the screw lead is made larger than the conventional one, the amount of advance of the molten resin containing fibers per rotation of the screw becomes large especially in the measuring section, As a result, at the same screw diameter and number of revolutions as the conventional screw, the time during which the fiber is sheared (total shear amount: product of shear rate and time) becomes shorter, which also reduces the fiber breakage. .
【００１７】さらに、第３の手段によれば、スクリュの
溝深さを深く形成しているので、特に樹脂が溶融状態と
なった以降の流動場即ち圧縮部の後流及び計量部近傍部
位において、スクリュ溝内での剪断応力を抑制できるた
め、繊維の切断を低減できる。Further, according to the third means, since the groove depth of the screw is formed deeply, especially in the flow field after the resin is in a molten state, that is, in the wake of the compression section and in the vicinity of the measuring section. Since the shear stress in the screw groove can be suppressed, the fiber cutting can be reduced.
【００１８】[0018]
【実施例】以下図面を参照して本発明の実施例を詳細に
説明する。図１には本発明の実施例に係るプラスチック
成形機用可塑化スクリュ及び同スクリュ取付部近傍の縦
断面図が示されている。Embodiments of the present invention will now be described in detail with reference to the drawings. FIG. 1 shows a vertical cross-sectional view of a plasticizing screw for a plastic molding machine and the vicinity of the screw mounting portion according to an embodiment of the present invention.
【００１９】図１において、スクリュ１０はペレット投
入口７側から押出口２５側へ向けて拡径されるテーパ状
の圧縮部２１と、同圧縮部２１の大径部に連結される計
量部２２とより構成され、従来のもののような供給部は
設けないように構成されており、さらにスクリュ先端に
は従来のものと同様なチェックリング４、および円錐状
のスクリュチップ５が装着されている。上記圧縮部２１
の長さ：Ｌ2 ’は、緩やかに圧縮することを目的として
いることから、スクリュ全長（Ｌ）に対して０．６Ｌな
いし０．９Ｌ程度と、従来のものよりも小さいテーパに
形成されるのが好ましく、圧縮比は１ないし２．５と、
従来のものよりも小さく構成する。In FIG. 1, the screw 10 has a tapered compression part 21 whose diameter is expanded from the pellet charging port 7 side to the extrusion port 25 side, and a measuring part 22 connected to the large diameter part of the compression part 21. The conventional check ring 4 and the conical screw tip 5 are attached to the tip of the screw. The compression unit 21
The length L 2 ′ is intended to be gently compressed, and is therefore formed to a taper smaller than the conventional one, which is about 0.6L to 0.9L with respect to the total screw length (L). It is preferable that the compression ratio is 1 to 2.5,
Configured smaller than conventional ones.
【００２０】また、スクリュリード：Ｐは１．２Ｄない
し２．０Ｄであり、好ましくは１．４Ｄないし１．７Ｄ
程度と、従来のものよりも大きくなるように構成する。
また、圧縮部開始点２１ａの溝深さ：ｈは、０．１Ｄな
いし０．３Ｄが適当である。尚、６は加熱シリンダ、７
はペレット投入口、２５は押出口である。Further, the screw lead P is 1.2D to 2.0D, preferably 1.4D to 1.7D.
It is configured to be larger than the conventional one.
Further, the groove depth h of the compressed portion starting point 21a is suitably 0.1D to 0.3D. In addition, 6 is a heating cylinder, 7
Is a pellet charging port, and 25 is an extrusion port.
【００２１】上記のように構成された可塑化スクリュ１
０を装備したプラスチック成形機の運転時において、長
繊維強化熱可塑性樹脂の長軸ペレット８は、ペレット投
入口７の上部のホッパー等（図示せず）から加熱シリン
ダ６内へ供給される。長軸ペレット８は、加熱シリンダ
６からの熱を受けるとともに、スクリュ１０の回転に従
い緩やかなテーパに構成された圧縮部２１ｂで可塑化さ
れながらスクリュ１０ａの先端側へ向かって進展する。
さらに、上記熱可塑性樹脂成分は圧縮部２１の終点近傍
で溶融状態となり、計量部２２へと進む。Plasticizing screw 1 constructed as described above
During operation of a plastic molding machine equipped with 0, long-axis pellets 8 of long-fiber-reinforced thermoplastic resin are supplied into the heating cylinder 6 from a hopper or the like (not shown) above the pellet charging port 7. The long-axis pellets 8 receive heat from the heating cylinder 6, and progress toward the tip side of the screw 10a while being plasticized by the compression portion 21b that is configured to have a gentle taper as the screw 10 rotates.
Further, the thermoplastic resin component becomes in a molten state in the vicinity of the end point of the compression section 21 and proceeds to the measuring section 22.
【００２２】この際において、上記スクリュ１０は従来
のもののように、スクリュの供給部を備えず、圧縮部２
１と計量部２２のみとしているので、限られたスクリュ
全長の中で圧縮部２１の長さが最大限に確保されること
となり、その結果圧縮部２１の溝深さの変化が緩やかに
形成されると共に、必要な圧縮比も同時に確保される。
これにより、樹脂温度などの溶融品質になんら支障なく
して、繊維切断の要因となる剪断、圧縮、引張り等の力
が抑制され、繊維の切断が低減される。At this time, unlike the conventional screw 10, the screw 10 does not have a screw supply portion, but the compression portion 2
Since only 1 and the measuring section 22 are used, the length of the compression section 21 is maximized within the limited total screw length, and as a result, the groove depth of the compression section 21 is gently changed. At the same time, the required compression ratio is secured at the same time.
As a result, the melt quality such as the resin temperature is not hindered, and the forces such as shearing, compression, and pulling, which cause the fiber cutting, are suppressed, and the fiber cutting is reduced.
【００２３】また圧縮比を、上記のように、可塑化・溶
融に必要な最小の値即ち１．０〜２．５に構成すれば、
この実施例における計量部２２の溝深さｈ2 は、図４に
示される従来のもののそれ（ｈ1 ）よりも深く形成され
る。If the compression ratio is set to the minimum value required for plasticizing and melting, that is, 1.0 to 2.5, as described above,
The groove depth h 2 of the measuring portion 22 in this embodiment is formed deeper than that (h 1 ) of the conventional one shown in FIG.
【００２４】図２には、この実施例に示されるような深
溝（溝深さＨ2 ）のスクリュと図４に示される従来のも
ののような浅溝（溝深さＨ1 ）のスクリュのスクリュ要
部の形状比較図が、図３には、上記両スクリュについて
のスクリュ溝内の繊維を含む溶融樹脂流速、剪断速度及
び剪断応力の比較図が示されている。FIG. 2 shows a screw having a deep groove (groove depth H 2 ) as shown in this embodiment and a screw having a shallow groove (groove depth H 1 ) like the conventional one shown in FIG. FIG. 3 shows a comparison diagram of the shapes of essential parts, and FIG. 3 shows a comparison diagram of the flow rate of molten resin containing fibers in the screw groove, the shear rate, and the shear stress for both screws.
【００２５】図３に明らかなように、深溝、浅溝の両ス
クリュ１０で同等の可塑量を得るものとした場合、シリ
ンダ内壁面６ａからの距離ｘ（深さ方向）に対する溝の
深さ方向の流速の勾配は、図２［Ｂ］に示される深溝ス
クリュ（深さＨ2 ）の方が図２［Ａ］に示される浅溝ス
クリュ（深さＨ1 ）よりも小さくなる。このため、繊維
を含んだ溶融樹脂の溝深さ方向ｘにおける剪断速度も、
深溝スクリュ（深さＨ 2 ）の方が浅溝スクリュ（深さＨ
1 ）よりも小さくなる。As is apparent from FIG. 3, both deep groove and shallow groove grooves are formed.
When the same amount of plastic is obtained with the cru 10,
Of the groove with respect to the distance x (depth direction) from the inner wall surface 6a
The gradient of the flow velocity in the depth direction is shown in Fig. 2 [B].
Cru (depth H2) Is the shallow groove groove shown in Fig. 2 [A].
Cru (depth H1) Is smaller than. Because of this, the fiber
The shear rate in the groove depth direction x of the molten resin containing
Deep groove screw (depth H 2) Is the shallow groove screw (depth H)
1) Is smaller than.
【００２６】従って、繊維切断の一要因である剪断応力
は、深溝スクリュ（深さＨ2 ）の方が浅溝スクリュ（深
さＨ1 ）よりも小さくなり、これにより、繊維切断が抑
制される。Therefore, the shear stress, which is one factor of fiber cutting, becomes smaller in the deep groove screw (depth H 2 ) than in the shallow groove screw (depth H 1 ), which suppresses fiber cutting. .
【００２７】よって図１に示される本発明の実施例に係
るスクリュ１０は、従来のものよりもスクリュの溝深さ
ｈ1 及びｈ2 が深く構成されることにより、剪断応力が
低減され、繊維の切断が抑制されることとなる。Therefore, in the screw 10 according to the embodiment of the present invention shown in FIG. 1, since the groove depths h 1 and h 2 of the screw are made deeper than those of the conventional screw, the shear stress is reduced, and the fiber Will be suppressed.
【００２８】また、上記実施例において、スクリュリー
ド：ｌを従来のものよりも大きく採ることにより、スク
リュ１回転当たりの繊維を含んだ溶融樹脂の進み量が大
きくなるため、樹脂が剪断流動場にさらされる時間が短
縮され、これによっても繊維の切断が抑制される。In the above embodiment, the screw lead: 1 is larger than that of the conventional screw lead, so that the amount of progress of the molten resin containing the fiber per one rotation of the screw is increased, so that the resin enters the shear flow field. The exposure time is reduced, which also suppresses fiber breakage.
【００２９】次に上記のように構成された本発明の実施
例に係るスクリュの実験結果につき説明する。型締力が
８０トンのインラインスクリュ方式の射出成形機に本発
明の実施例に係るスクリュ１０を装填し、長ガラス繊維
を含むペレット状のポリプロピレン（ＰＰ）を可塑化・
溶融させ、さらに射出して得られた樹脂塊中のガラス繊
維の重量平均繊維長を測定した。その結果は次の通りで
ある。Next, the experimental results of the screw according to the embodiment of the present invention constructed as above will be described. An inline screw type injection molding machine having a mold clamping force of 80 tons was loaded with the screw 10 according to the embodiment of the present invention, and pelletized polypropylene (PP) containing long glass fibers was plasticized.
The weight average fiber length of the glass fibers in the resin mass obtained by melting and further injecting was measured. The results are as follows.
【００３０】測定条件：Measurement conditions:
【００３１】スクリュ形状： （１）スクリュ径（Ｄ）：φ３６mm （２）Ｌ／Ｄ：２０ （３）圧縮部長さ：１６．５Ｄ（０．８２５Ｌ） （４）圧縮部開始点の溝深さ：６．６mm（０．１８Ｄ） （５）計量部の溝深さ：４．５mm（０．１２５Ｄ） （６）圧縮比：１．４７ （７）スクリュリード：１．５ＤScrew shape: (1) Screw diameter (D): φ36 mm (2) L / D: 20 (3) Length of compression part: 16.5D (0.825L) (4) Groove depth at the starting point of compression part : 6.6mm (0.18D) (5) Groove depth of measuring part: 4.5mm (0.125D) (6) Compression ratio: 1.47 (7) Screw lead: 1.5D
【００３２】長繊維強化熱可塑性樹脂： （１）ガラス繊維含有量：４０wt％ （２）ガラス繊維長：１２mm（ペレット長に同じ）Long fiber reinforced thermoplastic resin: (1) Glass fiber content: 40 wt% (2) Glass fiber length: 12 mm (same as pellet length)
【００３３】成形条件： （１）スクリュ回転数：１５０rpm （２）シリンダ温度：２３０℃ （３）スクリュ背圧（実際の樹脂圧）：１２kgf/cm2 Molding conditions: (1) Screw rotation speed: 150 rpm (2) Cylinder temperature: 230 ° C. (3) Screw back pressure (actual resin pressure): 12 kgf / cm 2
【００３４】測定結果：上記測定条件の許で、本発明の
実施例に係るスクリュ及び図４に示されるような従来の
スクリュを用いて、可塑化・溶融及び射出された樹脂塊
中の重量平均繊維長：ａを測定した。その結果は次の通
りである。 ・本発明のスクリュ：ａ＝６mm ・従来のスクリュ ：ａ＝３．５〜４．８mm 以上のように、本発明の実施例に係るスクリュによれ
ば、従来のスクリュに較べ２．５〜１．２mmの繊維長の
改善が得られ、殊に長繊維の切断が抑制されるという顕
著な効果が得られる。Measurement results: Under the above measurement conditions, using the screw according to the embodiment of the present invention and the conventional screw as shown in FIG. 4, the weight average in the resin mass plasticized, melted and injected. Fiber length: a was measured. The results are as follows. -Screw of the present invention: a = 6 mm-Conventional screw: a = 3.5 to 4.8 mm As described above, the screw according to the embodiment of the present invention is 2.5 to 1 compared with the conventional screw. A fiber length improvement of 0.2 mm is obtained, and in particular, a remarkable effect of suppressing cutting of long fibers is obtained.
【００３５】[0035]
【発明の効果】本発明によれば、長繊維強化熱可塑性樹
脂の可塑化・溶融を行うための可塑化スクリュにおい
て、同スクリュをテーパ状の圧縮部とこれに延設される
計量部のみにて形成し、かつ圧縮比を１．０〜２．５と
従来のものよりも小さく構成したので、スクリュの圧縮
部の長さが最大限に確保されるとともに溝の深さの変化
が緩やかに形成され、所要の圧縮比も確保され、樹脂の
溶融品質に支障なく、繊維に作用する剪断、圧縮、引張
等の力を抑制でき、繊維の切断を低減することができ
る。According to the present invention, in the plasticizing screw for plasticizing and melting the long fiber reinforced thermoplastic resin, the screw is provided only for the tapered compression portion and the measuring portion extended to this. The compression ratio is 1.0 to 2.5, which is smaller than the conventional one, so that the length of the compression part of the screw is secured to the maximum and the change of the groove depth is gentle. It is formed, the required compression ratio is secured, the melt quality of the resin is not hindered, the forces such as shearing, compression, and tension acting on the fiber can be suppressed, and the fiber cutting can be reduced.
【００３６】また、請求項２の発明によれば、スクリュ
１回転当たりの進み量の増加により、樹脂が剪断力を受
けている期間が短縮され、繊維の切断を低減することが
できる。According to the second aspect of the present invention, since the amount of advance per screw rotation is increased, the period during which the resin is subjected to the shearing force is shortened, and the fiber cutting can be reduced.
【００３７】さらに請求項３の発明によれば、スクリュ
溝を深くすることによりスクリュ溝内での剪断応力を抑
制することができ、これによっても繊維の切断を低減す
ることができる。Further, according to the third aspect of the present invention, by deepening the screw groove, the shear stress in the screw groove can be suppressed, and the cutting of the fiber can be reduced also by this.
【００３８】以上により、本発明によれば、強度、剛性
が高く、かつ高い耐衝撃性も併せ備えた樹脂成形品を得
ることができる。As described above, according to the present invention, it is possible to obtain a resin molded product having high strength and rigidity and also high impact resistance.
【図１】本発明の実施例に係るプラスチック成形機用可
塑化スクリュの縦断面図。FIG. 1 is a vertical sectional view of a plasticizing screw for a plastic molding machine according to an embodiment of the present invention.
【図２】スクリュの溝部拡大図。FIG. 2 is an enlarged view of a groove portion of a screw.
【図３】スクリュに作用する力及び樹脂流速の分布図。FIG. 3 is a distribution diagram of a force acting on a screw and a resin flow velocity.
【図４】従来の可塑化スクリュを示す図１応当図。FIG. 4 is an illustration corresponding to FIG. 1 showing a conventional plasticizing screw.
４ チェックリング ５ スクリュチップ ７ ペレット投入口 ８ 長軸ペレット １０ スクリュ ２１ 圧縮部 ２２ 計量部 ２５ 押出口 4 Check ring 5 Screw tip 7 Pellet input port 8 Long axis pellet 10 Screw 21 Compressing part 22 Measuring part 25 Extrusion port
Claims (3)
成される樹脂成形ペレットの可塑化・溶融を行うための
可塑化スクリュを備えたプラスチック成形機において、
上記可塑化スクリュは、ペレットの投入口側から押出口
側へ向けて拡径されたテーパ状の圧縮部と、同圧縮部の
大径部に結合される計量部とより成るとともに、供給部
を設けず、かつ圧縮比が１．０〜２．５に設定されたこ
とを特徴とする樹脂の可塑化スクリュ。1. A plastic molding machine equipped with a plasticizing screw for plasticizing and melting resin-molded pellets composed of a composition of long fibers and a thermoplastic resin,
The plasticizing screw is composed of a taper-shaped compression part whose diameter is expanded from the charging port side of the pellet toward the extrusion port side, and a measuring part coupled to the large-diameter part of the compression part. A plasticizing screw of resin, which is not provided and has a compression ratio set to 1.0 to 2.5.
２．０Ｄ（Ｄはスクリュの呼び直径）に形成された請求
項１記載の樹脂の可塑化スクリュ。2. The plasticizing screw for resin according to claim 1, wherein the screw lead: P is formed in a range of 1.2D to 2.0D (D is a nominal diameter of the screw).
０．１Ｄないし０．３Ｄ（Ｄはスクリュの呼び直径）に
形成された請求項１記載の樹脂の可塑化スクリュ。3. A plasticized screw for a resin according to claim 1, wherein the groove depth h of the screw starting point of the compression part is 0.1D to 0.3D (D is the nominal diameter of the screw).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7128032A JPH08318561A (en) | 1995-05-26 | 1995-05-26 | Resin plasticizing screw |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7128032A JPH08318561A (en) | 1995-05-26 | 1995-05-26 | Resin plasticizing screw |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH08318561A true JPH08318561A (en) | 1996-12-03 |
Family
ID=14974832
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7128032A Withdrawn JPH08318561A (en) | 1995-05-26 | 1995-05-26 | Resin plasticizing screw |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH08318561A (en) |
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998052736A1 (en) * | 1997-05-22 | 1998-11-26 | Kawasaki Steel Corporation | Screw and apparatus for plasticizing fiber-reinforced thermoplastic resins, and method and product of molding the resins |
| US6921191B2 (en) * | 2002-08-23 | 2005-07-26 | Concor Tool And Machinery | Injection/extruder screw |
| JP2006341488A (en) * | 2005-06-09 | 2006-12-21 | Mitsubishi Heavy Ind Ltd | Twin-screw feeder, seating apparatus and kneading system using the feeder |
| JP2008095066A (en) * | 2006-05-25 | 2008-04-24 | Mitsubishi Engineering Plastics Corp | Molded article from fiber-reinforced thermoplastic resin |
| WO2009051027A1 (en) * | 2007-10-19 | 2009-04-23 | Yazaki Corporation | Resin molding apparatus |
| JP2009292115A (en) * | 2008-06-09 | 2009-12-17 | Yazaki Corp | Resin molding machine |
| WO2009154698A1 (en) * | 2008-06-19 | 2009-12-23 | Eastman Chemical Company | Screw designs having improved performance with low melting pet resins |
| JP2011224801A (en) * | 2010-04-15 | 2011-11-10 | Toyo Mach & Metal Co Ltd | Injection molding machine |
| JP2013199121A (en) * | 2006-05-25 | 2013-10-03 | Mitsubishi Engineering Plastics Corp | Molding of fiber-reinforced thermoplastic resin |
| KR20150137983A (en) * | 2014-05-30 | 2015-12-09 | 정인중 | A foreign substance remover of resin |
| KR20160109860A (en) | 2015-03-13 | 2016-09-21 | 주상규 | Control apparatus for supplying fiber-additives to injection molding machine |
-
1995
- 1995-05-26 JP JP7128032A patent/JPH08318561A/en not_active Withdrawn
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1998052736A1 (en) * | 1997-05-22 | 1998-11-26 | Kawasaki Steel Corporation | Screw and apparatus for plasticizing fiber-reinforced thermoplastic resins, and method and product of molding the resins |
| EP0920971A1 (en) * | 1997-05-22 | 1999-06-09 | Kawasaki Steel Corporation | Screw and apparatus for plasticizing fiber-reinforced thermoplastic resins, and method and product of molding the resins |
| US6228308B1 (en) | 1997-05-22 | 2001-05-08 | Kawasaki Steel Corporation | Screw and apparatus for plasticizing fiber-reinforced thermoplastic resins, and method and product of molding the resins |
| EP0920971A4 (en) * | 1997-05-22 | 2002-08-07 | Kawasaki Steel Co | Screw and apparatus for plasticizing fiber-reinforced thermoplastic resins, and method and product of molding the resins |
| US6921191B2 (en) * | 2002-08-23 | 2005-07-26 | Concor Tool And Machinery | Injection/extruder screw |
| JP2006341488A (en) * | 2005-06-09 | 2006-12-21 | Mitsubishi Heavy Ind Ltd | Twin-screw feeder, seating apparatus and kneading system using the feeder |
| JP2008095066A (en) * | 2006-05-25 | 2008-04-24 | Mitsubishi Engineering Plastics Corp | Molded article from fiber-reinforced thermoplastic resin |
| JP2013199121A (en) * | 2006-05-25 | 2013-10-03 | Mitsubishi Engineering Plastics Corp | Molding of fiber-reinforced thermoplastic resin |
| WO2009051027A1 (en) * | 2007-10-19 | 2009-04-23 | Yazaki Corporation | Resin molding apparatus |
| JP2009292115A (en) * | 2008-06-09 | 2009-12-17 | Yazaki Corp | Resin molding machine |
| WO2009154698A1 (en) * | 2008-06-19 | 2009-12-23 | Eastman Chemical Company | Screw designs having improved performance with low melting pet resins |
| US8057726B2 (en) | 2008-06-19 | 2011-11-15 | Grupo Petrotemex, S.A. De C.V. | Screw designs having improved performance with low melting PET resins |
| JP2011224801A (en) * | 2010-04-15 | 2011-11-10 | Toyo Mach & Metal Co Ltd | Injection molding machine |
| KR20150137983A (en) * | 2014-05-30 | 2015-12-09 | 정인중 | A foreign substance remover of resin |
| KR20160109860A (en) | 2015-03-13 | 2016-09-21 | 주상규 | Control apparatus for supplying fiber-additives to injection molding machine |
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