JP2000025066A - Injection apparatus and method for injection molding - Google Patents
Injection apparatus and method for injection moldingInfo
- Publication number
- JP2000025066A JP2000025066A JP10200148A JP20014898A JP2000025066A JP 2000025066 A JP2000025066 A JP 2000025066A JP 10200148 A JP10200148 A JP 10200148A JP 20014898 A JP20014898 A JP 20014898A JP 2000025066 A JP2000025066 A JP 2000025066A
- Authority
- JP
- Japan
- Prior art keywords
- injection
- molten resin
- injection material
- gas
- passage
- 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
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C45/00—Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
- B29C45/17—Component parts, details or accessories; Auxiliary operations
- B29C45/1703—Introducing an auxiliary fluid into the mould
- B29C45/1704—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles
- B29C2045/1722—Introducing an auxiliary fluid into the mould the fluid being introduced into the interior of the injected material which is still in a molten state, e.g. for producing hollow articles injecting fluids containing plastic material
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は射出装置および射出
成形方法に係り、特に成形品に「ひけ」が生じるのを防
止できる射出装置および射出成形方法に関するものであ
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an injection apparatus and an injection molding method, and more particularly to an injection apparatus and an injection molding method capable of preventing occurrence of sink marks in a molded product.
【０００２】[0002]
【従来の技術】合成樹脂を可塑化して射出成形し成形品
を製作した場合に、射出成形品に凹みができる「ひけ」
が生じることがある。この「ひけ」は金型内に充満した
溶融樹脂が冷却固化するとき、表面が先に固化し中心部
の固化が遅れるときに発生する。成形品の特に厚肉部な
どは、冷却が遅れやすいため、冷却が遅れた部分の収縮
によって表面が引っ張られることにより「ひけ」が発生
するおそれが高い。そこで、「ひけ」の発生を防止する
ため、射出成形を行う際、「ひけ」が発生するおそれの
高い厚肉部等に高圧ガスを注入するいわゆる高圧ガス成
形が行われている。2. Description of the Related Art When a molded article is manufactured by plasticizing a synthetic resin and performing injection molding, a recess is formed in the injection molded article.
May occur. This sink occurs when the molten resin filled in the mold is solidified by cooling, when the surface solidifies first and solidification of the central portion is delayed. Since cooling of a molded product, particularly a thick portion, is likely to be delayed, “shrinkage” is highly likely to occur due to the surface being pulled by shrinkage of the portion where the cooling is delayed. Therefore, in order to prevent the occurrence of "sink", when performing injection molding, so-called high-pressure gas molding in which a high-pressure gas is injected into a thick portion or the like where "sink" is likely to occur is performed.
【０００３】[0003]
【発明が解決しようとする課題】しかしながら、高圧ガ
ス成形は、厚肉部等の「ひけ」が生じやすい部分のみを
対象に行うため、成形品全体の「ひけ」の防止を行うこ
とはできず、思わぬところに「ひけ」ができてしまい、
不良品を発生するおそれもある。However, since high-pressure gas molding is performed only on a portion such as a thick portion where "sinking" is likely to occur, it is not possible to prevent "sinking" of the entire molded product. , "Sink" is created in unexpected places,
Defective products may also occur.
【０００４】本発明は上記した従来の問題点に鑑みて為
されたものであり、成形品の「ひけ」を完全に防止で
き、しかも射出材料の量を節約できるとともに軽量化が
できて、しかも曲げや圧縮に強い成形品を得ることがで
きる射出装置および射出成方法を提供することを目的と
する。SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and it is possible to completely prevent "sinking" of a molded product, to save the amount of injection material and to reduce the weight. It is an object of the present invention to provide an injection apparatus and an injection forming method capable of obtaining a molded product that is resistant to bending and compression.
【０００５】[0005]
【課題を解決するための手段】この目的を達成するため
に、請求項１の発明は、可塑化された射出材料を金型内
へ射出する射出装置であって、射出材料の通過路を有す
る筒状体と、前記通過路から可塑化された射出材料を押
出して射出口から射出させる押出し手段を具備する射出
装置において、前記通過路で射出材料の可塑化が終了す
る領域より射出口側に設けられ前記通過路へガスを供給
するガス供給手段と、前記ガス供給手段によって供給さ
れたガスと可塑化された射出材料とを混合する混合手段
とを備えたことを特徴とする射出装置である。According to the present invention, there is provided an injection apparatus for injecting a plasticized injection material into a mold, which has a passage for the injection material. In an injection apparatus including a cylindrical body and an extrusion unit that extrudes a plasticized injection material from the passage and injects the injection material from an injection port, the injection path is closer to an injection port than an area where plasticization of the injection material is completed in the passage. An injection apparatus comprising: a gas supply unit provided to supply a gas to the passage; and a mixing unit configured to mix a gas supplied by the gas supply unit with a plasticized injection material. .
【０００６】請求項２の発明は、請求項１に記載した射
出装置において、混合手段は通過路の途中に配置された
ネットによって構成されていること特徴とする射出装置
である。According to a second aspect of the present invention, in the injection apparatus of the first aspect, the mixing means is constituted by a net disposed in the middle of the passage.
【０００７】請求項３の発明は、請求項１に記載した射
出装置において、混合手段は通過路の途中に配置され回
転するプロペラによって構成されていることを特徴とす
る射出装置である。According to a third aspect of the present invention, in the injection apparatus of the first aspect, the mixing means is constituted by a rotating propeller disposed in the middle of the passage.
【０００８】請求項４の発明は、射出材料を可塑化する
可塑化工程と、前記可塑化された射出材料にガスを供給
するガス供給工程と、射出材料とガスとを混合し射出材
料に気泡を形成する混合工程と、気泡が形成された射出
材料を金型内へ射出する射出工程とからなる射出成形方
法である。According to a fourth aspect of the present invention, there is provided a plasticizing step of plasticizing an injection material, a gas supplying step of supplying a gas to the plasticized injection material, and a step of mixing the injection material and the gas to form bubbles in the injection material. And an injection step of injecting an injection material having bubbles formed therein into a mold.
【０００９】請求項５の発明は、請求項４に記載した射
出成形方法において、射出材料の射出圧力は、５ｋｇ／
ｃｍ2から８０ｋｇ／ｃｍ2であることを特徴とする射出
成形方法である。According to a fifth aspect of the present invention, in the injection molding method of the fourth aspect, the injection pressure of the injection material is 5 kg /
An injection molding method characterized in that the pressure is in the range of cm 2 to 80 kg / cm 2 .
【００１０】[0010]
【発明の実施の形態】図１から図４によって本発明の第
１の実施の形態に係るインラインスクリュー式の射出装
置１および射出成形方法ついて説明する。符号３は筒状
体としてのシリンダを示し、このシリンダ３には中心孔
５が形成されている。シリンダ３の外周部には、複数の
バンドヒータ７が取り付けられている。1 to 4, an in-line screw type injection device 1 and an injection molding method according to a first embodiment of the present invention will be described. Reference numeral 3 denotes a cylinder as a cylindrical body, and a center hole 5 is formed in the cylinder 3. A plurality of band heaters 7 are attached to the outer periphery of the cylinder 3.
【００１１】シリンダ３の先端部には取付け孔９が設け
られ、この取付け孔９は中心孔５と同心で、しかも中心
孔５より一回り大きい径寸法に形成されている。収容孔
９の内周面には雌ネジ１１が形成されている。符号１０
はノズルを示し、このノズル１０の基端側の外周部には
雄ネジが形成され、この雄ネジが取付け孔９の雌ネジに
取り付けられて、ノズル１０がシリンダ３の先端に固定
されている。ノズル１０の外周部には、バンドヒータ１
２が取り付けられている。A mounting hole 9 is provided at the tip of the cylinder 3, and the mounting hole 9 is formed concentric with the center hole 5 and has a diameter slightly larger than the center hole 5. A female screw 11 is formed on the inner peripheral surface of the accommodation hole 9. Code 10
Denotes a nozzle, and a male screw is formed on the outer peripheral portion on the base end side of the nozzle 10. The male screw is attached to the female screw of the mounting hole 9, and the nozzle 10 is fixed to the distal end of the cylinder 3. . A band heater 1 is provided on the outer periphery of the nozzle 10.
2 are installed.
【００１２】図２に詳細に示すように、ノズル１０には
シリンダ３の中心孔５に連通する連通孔１４が形成さ
れ、さらに連通孔１４に連通する収容孔１６が形成され
ている。収容孔１６の内周面には、雌ネジ１８が形成さ
れている。また収容孔１６には、第１ネット１３、中心
に孔１５を有するスペーサ１７、第２ネット１９、抜け
止め部材２１が、この順で収容されている。As shown in detail in FIG. 2, the nozzle 10 has a communication hole 14 communicating with the center hole 5 of the cylinder 3, and further has a receiving hole 16 communicating with the communication hole 14. A female screw 18 is formed on the inner peripheral surface of the accommodation hole 16. In the housing hole 16, the first net 13, the spacer 17 having the hole 15 at the center, the second net 19, and the retaining member 21 are housed in this order.
【００１３】抜け止め部材２１の外周部には雄ネジ２３
が形成され、この雄ネジ２３が収容孔１６の雌ネジ１８
に取付けられて、第１ネット１３、スペーサ１７及び第
２ネット１９が固定されている。第１ネット１３と第２
ネット１９は、網目がずれて合致しないように固定され
る。抜け止め部材２１の中心には孔２５が形成され、こ
の孔２５の先端側の開口が射出口２８となる。また先端
部には円弧状の工具差し込み孔２７が４つ形成されてい
る。抜け止め部材２１を収容孔１６から着脱する場合
は、この工具差し込み孔２７に工具を差し込み、抜け止
め部材２１を回転させる。A male screw 23 is provided on the outer periphery of the retaining member 21.
Is formed, and the male screw 23 is provided with the female screw 18 of the accommodation hole 16.
, The first net 13, the spacer 17, and the second net 19 are fixed. 1st net 13 and 2nd
The net 19 is fixed so that the meshes are not shifted and matched. A hole 25 is formed in the center of the retaining member 21, and an opening on the tip side of the hole 25 serves as an emission port 28. Also, four arc-shaped tool insertion holes 27 are formed at the tip end. When attaching and detaching the retaining member 21 from the accommodation hole 16, a tool is inserted into the tool insertion hole 27, and the retaining member 21 is rotated.
【００１４】射出材料の通過路は、中心孔５、連通孔１
４及びスペーサ１７の孔１５及び抜け止め部材２１の孔
２５によって構成されている。符号２９はガス供給管を
示し、このガス供給管２９はノズル１０の途中部分に接
続され、ガス供給管２９の先端は連通孔１４に臨んでい
る。ガス供給管２９は、連通孔１４の後述する溶融樹脂
Ｐの可塑化が終了する領域より射出口２８側に備えられ
ている。ガス供給管２９は図示しないガス供給装置に接
続され、ガス供給管２９から窒素ガスを供給する。符号
３１は押出し手段としてのスクリューを示し、このスク
リュー３１は中心孔５へ挿入されている。図３に示すよ
うにノズル１０は金型３３に接続され、孔２５はスプル
３５に連通している。The passage of the injection material includes the center hole 5, the communication hole 1
4 and the hole 15 of the spacer 17 and the hole 25 of the retaining member 21. Reference numeral 29 denotes a gas supply pipe. The gas supply pipe 29 is connected to an intermediate portion of the nozzle 10, and the tip of the gas supply pipe 29 faces the communication hole 14. The gas supply pipe 29 is provided closer to the injection port 28 than a region of the communication hole 14 where plasticization of the molten resin P described later is completed. The gas supply pipe 29 is connected to a gas supply device (not shown) and supplies nitrogen gas from the gas supply pipe 29. Reference numeral 31 denotes a screw as a pushing means, and the screw 31 is inserted into the center hole 5. As shown in FIG. 3, the nozzle 10 is connected to the mold 33, and the hole 25 communicates with the sprue 35.
【００１５】次に、射出装置１を用いた射出成形方法に
ついて説明する。射出装置１の図示しないホッパからナ
イロンのペレットを投入する。このペレットはシリンダ
３の中心孔５へ供給され、回転するスクリュー３１によ
って搬送され、その間にバンドヒータ７の加熱により可
塑化され溶融樹脂Ｐとなる。そして、図３に示すように
ノズル１０の連通孔１４へ流入する。Next, an injection molding method using the injection device 1 will be described. Nylon pellets are charged from a hopper (not shown) of the injection device 1. The pellets are supplied to the center hole 5 of the cylinder 3 and conveyed by the rotating screw 31, during which the pellets are plasticized by the heating of the band heater 7 to become a molten resin P. Then, as shown in FIG. 3, the fluid flows into the communication hole 14 of the nozzle 10.
【００１６】一方、窒素ガスがガス供給管２９から供給
され、窒素ガスの気泡Ｎが溶融樹脂Ｐに混入する。尚、
ガス供給管２９が窒素ガスを供給する手前で、溶融樹脂
Ｐは、完全に溶解しているので、この溶融樹脂Ｐによっ
て連通孔１４の途中部分が塞がれており、窒素ガスがシ
リンダ３側へ抜けることはない。さらに溶融樹脂Ｐは、
ノズル１０の先端側へ搬送され、第１ネット１３及び第
２ネット１９を通過し、この際、窒素ガスの気泡Ｎは細
かく分かれ、溶融樹脂Ｐと混合されて、直径が２ミリメ
ートルから３ミリメートルの細な気泡ｎとなり溶融樹脂
Ｐ内に満遍なく分布する状態となる。そして、微細な気
泡ｎを含んだ溶融樹脂Ｐはスプル３５を通って、キャビ
ティ３７に射出される。尚、溶融樹脂Ｐの射出圧力は通
常よる低く、１０ｋｇ／ｃｍ2から２０ｋｇ／ｃｍ2で行
う。微細な気泡ｎがつぶれてしまうのを防止するためで
ある。On the other hand, nitrogen gas is supplied from the gas supply pipe 29, and bubbles N of nitrogen gas are mixed into the molten resin P. still,
Before the gas supply pipe 29 supplies the nitrogen gas, the molten resin P is completely dissolved. Therefore, the intermediate portion of the communication hole 14 is closed by the molten resin P, and the nitrogen gas is supplied to the cylinder 3 side. There is no escape. Further, the molten resin P
It is conveyed to the tip side of the nozzle 10 and passes through the first net 13 and the second net 19, and at this time, the bubbles N of the nitrogen gas are finely divided and mixed with the molten resin P to have a diameter of 2 to 3 mm. The bubbles become fine bubbles n and are distributed evenly in the molten resin P. Then, the molten resin P containing the fine bubbles n is injected into the cavity 37 through the sprue 35. In addition, the injection pressure of the molten resin P is lower than usual, and the injection is performed at 10 kg / cm 2 to 20 kg / cm 2 . This is to prevent the fine bubbles n from being crushed.
【００１７】溶融樹脂Ｐは、多数の微細な気泡ｎを含ん
でいるため、冷却の遅れた部分があり、成形品の表面を
引っ張る力が発生しても、微細な気泡ｎが緩衝として機
能し、引張る力が表面へ伝達されるのを防ぐ。従って、
「ひけ」の発生を防止することができる。図４に上記の
方法によって製作した成形品Ｓの断面図を示す。同図に
示すように成形品Ｓは、多数の微細な気泡ｎを含んだ状
態で固化するので、言わばハニカム構造となり、曲げや
圧縮に強い構造を得ることができる。さらに成形品の軽
量化が可能となり、しかも同じ大きさの成形品を製作す
るための樹脂の量を減らすことができる。Since the molten resin P contains a large number of fine bubbles n, there is a portion where cooling is delayed, and even if a force for pulling the surface of the molded article is generated, the fine bubbles n function as a buffer. Prevents the pulling force from being transmitted to the surface. Therefore,
It is possible to prevent the occurrence of "sink". FIG. 4 shows a cross-sectional view of the molded product S manufactured by the above method. As shown in the figure, since the molded article S is solidified in a state containing many fine bubbles n, it has a so-called honeycomb structure, and a structure resistant to bending and compression can be obtained. Furthermore, the weight of the molded product can be reduced, and the amount of resin for producing a molded product of the same size can be reduced.
【００１８】なお、ガス供給管２９からの窒素ガスの供
給を一時的に停止させれば、微細な気泡ｎを含まない部
分を形成することができるので、所望の部分にのみ微細
な気泡ｎが形成された成形品を製作することが可能であ
る。従って、例えば、内部にのみ微細な気泡ｎを含み、
外側部は微細な気泡ｎを含まない構造の成形品を製作す
ることも可能である。If the supply of the nitrogen gas from the gas supply pipe 29 is temporarily stopped, a portion not containing the fine bubbles n can be formed, so that the fine bubbles n are formed only in the desired portions. It is possible to produce the formed molded article. Therefore, for example, only the inside contains fine bubbles n,
It is also possible to manufacture a molded product having a structure in which the outer portion does not include fine bubbles n.
【００１９】図５に本発明の第２実施例に係る射出装置
４１を示す。この射出装置４１は、第１の実施の形態に
係る射出装置１と同様の構成部分を有するので、同様の
構成部分についての説明は省略し、異なる構成部分につ
いてのみ説明する。また、第２の実施の形態の説明にお
いて、第１の実施の形態と同様の部材については、第１
の実施の形態の形態で用いた符号を引用する。FIG. 5 shows an injection device 41 according to a second embodiment of the present invention. Since the injection device 41 has the same components as the injection device 1 according to the first embodiment, the description of the same components will be omitted, and only different components will be described. In the description of the second embodiment, the same members as those in the first embodiment are referred to as the first members.
The reference numerals used in the embodiment will be cited.
【００２０】ノズル４３には連通孔４５が形成されてお
り、この連通孔４５はシリンダ３の中心孔５に連通して
いる。符号４７は混合手段としてのプロペラを示し、こ
のプロペラ４７には回転軸４９の一端が固定されてい
る。回転軸４９の他端はスクリュー３１の先端部に取り
付けられており、プロペラ４７はスクリュー３１と共に
回転する。A communication hole 45 is formed in the nozzle 43, and the communication hole 45 communicates with the center hole 5 of the cylinder 3. Reference numeral 47 denotes a propeller as mixing means, and one end of a rotating shaft 49 is fixed to the propeller 47. The other end of the rotating shaft 49 is attached to the tip of the screw 31, and the propeller 47 rotates together with the screw 31.
【００２１】次に、射出装置４１を用いた射出成形方法
について説明する。射出装置４１は、射出装置１と同様
にして、可塑化された溶融樹脂Ｐがシリンダ３の中心孔
５内を搬送され、ノズル４３の孔４５へ流入する。一
方、ガス供給管２９から窒素ガスが供給され、窒素ガス
の気泡Ｎが溶融樹脂Ｐに混入する。さらに溶融樹脂Ｐ
は、ノズル４３の先端側へ搬送され、回転するプロペラ
によって、窒素ガスの気泡Ｎは細かく分けられ、溶融樹
脂Ｐと混合されて、微細な気泡ｎとなり溶融樹脂Ｐ内に
満遍なく分布する状態となる。そして、微細な気泡ｎを
含んだ溶融樹脂Ｐは、射出口４６、スプル３５を通っ
て、キャビティ３７に射出される。Next, an injection molding method using the injection device 41 will be described. In the injection device 41, similarly to the injection device 1, the plasticized molten resin P is conveyed in the center hole 5 of the cylinder 3 and flows into the hole 45 of the nozzle 43. On the other hand, nitrogen gas is supplied from the gas supply pipe 29, and bubbles N of nitrogen gas are mixed into the molten resin P. Furthermore, molten resin P
Is transported to the tip end side of the nozzle 43, and the bubbles N of the nitrogen gas are finely divided by the rotating propeller and mixed with the molten resin P to form fine bubbles n, which are distributed evenly in the molten resin P. . Then, the molten resin P including the fine bubbles n is injected into the cavity 37 through the injection port 46 and the sprue 35.
【００２２】上記の方法によって製作した成形品は、図
４に示した成形品Ｓと同様に、多数の微細な気泡ｎを含
んだ状態で固化するので、曲げや圧縮に強い構造を得る
ことができる。さらに成形品の軽量化が可能となり、し
かも同じ大きさの成形品を製作するための樹脂の量を減
らすことができる。The molded article manufactured by the above method solidifies in a state containing many fine bubbles n, similarly to the molded article S shown in FIG. 4, so that a structure resistant to bending and compression can be obtained. it can. Furthermore, the weight of the molded product can be reduced, and the amount of resin for producing a molded product of the same size can be reduced.
【００２３】以上、本発明の実施の形態について詳述し
てきたが、具体的な構成はこの実施の形態に限られるも
のではなく、本発明の要旨を逸脱しない範囲における設
計の変更などがあっても本発明に含まれる。例えば、上
記実施の形態では、気泡の直径を２ミリメートルから３
ミリメートルとしたが、ネットの目の大きさを代えたり
して変更することが可能である。気泡の大きさは、樹脂
の種類、成形品の大きさによって、数ミクロンから数セ
ンチメートルの範囲で変更する。上記実施の形態におい
て、溶融樹脂の射出圧力は１０ｋｇ／ｃｍ2から２０ｋ
ｇ／ｃｍ2としたが、本発明は、これに限定されず、使
用する樹脂の種類や成形品の形状、大きさ等によって５
ｋｇ／ｃｍ2から８０ｋｇ／ｃｍ2の範囲で調節する。Although the embodiment of the present invention has been described in detail above, the specific configuration is not limited to this embodiment, and there is a change in design without departing from the gist of the present invention. Are also included in the present invention. For example, in the above embodiment, the diameter of the bubble is set to 2 mm to 3 mm.
Although it is millimeter, it is possible to change it by changing the size of the net eyes. The size of the bubbles varies from several microns to several centimeters depending on the type of resin and the size of the molded product. In the above embodiment, the injection pressure of the molten resin is 10 kg / cm 2 to 20 k.
g / cm 2 , but the present invention is not limited to this, and may vary depending on the type of resin used and the shape and size of the molded product.
Adjust in the range of kg / cm 2 to 80 kg / cm 2 .
【００２４】上記実施の形態では、インラインスクリュ
ー式の記射出装置を示したが、本発明の射出装置は、こ
れに限定されず、プランジャ式、プリプラ式等の射出装
置に適用することも可能である。また、使用する樹脂も
ナイロンに限らず、ＰＰＳ、ＰＰＤ等を使用してもよ
い。In the above embodiment, the injection device of the in-line screw type has been described. However, the injection device of the present invention is not limited to this, and can be applied to an injection device of a plunger type, a pre-plastic type or the like. is there. The resin used is not limited to nylon, and PPS, PPD, or the like may be used.
【００２５】[0025]
【発明の効果】以上のように、本発明によれば、成形品
の「ひけ」を完全に防止でき、しかも射出材料の量を節
約できるとともに軽量化ができる。しかも曲げや圧縮に
強い成形品を得ることができるようになる。As described above, according to the present invention, "sinking" of a molded article can be completely prevented, and the amount of injection material can be saved and the weight can be reduced. Moreover, it is possible to obtain a molded product that is resistant to bending and compression.
【図１】本発明の第１の実施の形態に係る射出装置の断
面図である。FIG. 1 is a cross-sectional view of an injection device according to a first embodiment of the present invention.
【図２】図１に示す射出装置の部分分解斜視図である。FIG. 2 is a partially exploded perspective view of the injection device shown in FIG.
【図３】図１に示す射出装置を用いた射出成形方法を説
明するための断面図である。FIG. 3 is a cross-sectional view for explaining an injection molding method using the injection device shown in FIG.
【図４】図１に示す射出装置を用いた射出成形方法によ
って成形した成形品の断面図である。FIG. 4 is a sectional view of a molded product molded by an injection molding method using the injection device shown in FIG.
【図５】第２の実施の形態に係る射出装置の部分拡大斜
視図である。FIG. 5 is a partially enlarged perspective view of an injection device according to a second embodiment.
１、４１ 射出装置 ３ シリンダ ５ 中心孔 １０、４３ ノズル １３ 第１ネット １５ スペーサの孔 １９ 第２ネット ２１ 抜け止め部材 ２５ 抜け止め部材の孔 ２８、４６ 射出口 ３１ スクリュー １４、４５ 連通孔 ４７ プロペラ 1, 41 Injection device 3 Cylinder 5 Center hole 10, 43 Nozzle 13 First net 15 Spacer hole 19 Second net 21 Retaining member 25 Retaining member hole 28, 46 Injection port 31 Screw 14, 45 Communication hole 47 Propeller
Claims (5)
射出装置であって、射出材料の通過路を有する筒状体
と、前記通過路から可塑化された射出材料を押出して射
出口から射出させる押出し手段を具備する射出装置にお
いて、前記通過路で射出材料の可塑化が終了する領域よ
り射出口側に設けられ前記通過路へガスを供給するガス
供給手段と、前記ガス供給手段によって供給されたガス
と可塑化された射出材料とを混合する混合手段とを備え
たことを特徴とする射出装置。An injection device for injecting a plasticized injection material into a mold, comprising: a cylindrical body having a passage for the injection material; and extruding the plasticized injection material from the passage for injection. In an injection apparatus having an extruding means for injecting from an outlet, a gas supply means provided on an injection port side of a region where plasticization of an injection material ends in the passage and supplying gas to the passage, and the gas supply unit A mixing means for mixing the gas supplied by the above and the plasticized injection material.
合手段は通過路の途中に配置されたネットによって構成
されていること特徴とする射出装置。2. The injection device according to claim 1, wherein the mixing means is constituted by a net arranged in the middle of the passage.
合手段は通過路の途中に配置され回転するプロペラによ
って構成されていることを特徴とする射出装置。3. The injection apparatus according to claim 1, wherein the mixing means is constituted by a rotating propeller disposed in the middle of the passage.
可塑化された射出材料にガスを供給するガス供給工程
と、射出材料とガスとを混合し射出材料に気泡を形成す
る混合工程と、気泡が形成された射出材料を金型内へ射
出する射出工程とからなる射出成形方法。4. A plasticizing step for plasticizing the injection material, a gas supplying step for supplying a gas to the plasticized injection material, and a mixing step for mixing the injection material and the gas to form bubbles in the injection material. And an injection step of injecting an injection material having bubbles formed therein into a mold.
て、射出材料の射出圧力は、５ｋｇ／ｃｍ2から８０ｋ
ｇ／ｃｍ2であることを特徴とする射出成形方法。5. The injection molding method according to claim 4, wherein the injection pressure of the injection material is from 5 kg / cm 2 to 80 k.
g / cm 2 .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10200148A JP2000025066A (en) | 1998-07-15 | 1998-07-15 | Injection apparatus and method for injection molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP10200148A JP2000025066A (en) | 1998-07-15 | 1998-07-15 | Injection apparatus and method for injection molding |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JP2000025066A true JP2000025066A (en) | 2000-01-25 |
Family
ID=16419597
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP10200148A Pending JP2000025066A (en) | 1998-07-15 | 1998-07-15 | Injection apparatus and method for injection molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2000025066A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100497970B1 (en) * | 2002-08-13 | 2005-07-01 | 현대모비스 주식회사 | Injection molder for mixing gas |
| US7107601B2 (en) | 2000-06-14 | 2006-09-12 | Canon Kabushiki Kaisha | Foam molding method and apparatus |
-
1998
- 1998-07-15 JP JP10200148A patent/JP2000025066A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7107601B2 (en) | 2000-06-14 | 2006-09-12 | Canon Kabushiki Kaisha | Foam molding method and apparatus |
| KR100497970B1 (en) * | 2002-08-13 | 2005-07-01 | 현대모비스 주식회사 | Injection molder for mixing gas |
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