JP2005271524A - Resin molding apparatus and resin molding method - Google Patents
Resin molding apparatus and resin molding method Download PDFInfo
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Abstract
Description
本発明は空搬式樹脂搬送装置を備えた熱可塑性樹脂の樹脂成形装置に関し、詳しくは、熱可塑性樹脂の可塑化の際に樹脂焼けが発生しない樹脂成形装置に関する。 The present invention relates to a resin molding apparatus for a thermoplastic resin provided with an airborne resin conveying apparatus, and more particularly to a resin molding apparatus that does not cause resin burning when plasticizing a thermoplastic resin.
ノルボルネン系樹脂で代表される脂環式構造含有熱可塑性樹脂は、透明性、低複屈折性、耐熱性、低吸水性等に優れているため、光ディスク、スーパーオーディオＣＤ、磁気ディスク、光学レンズ、液晶表示素子（ＬＣＤ）、導光板、光学フィルムなどに好適な成形素材として利用されている。
これらの用途では、塵埃などの異物；有機成分や水分などの揮発性成分；樹脂の焼けや未溶融などに起因する黒点、未溶融粒子などの不均質スポット；などが成形品に存在すると、光学特性、電気特性、表面特性などに障害を来たす。そのため、異物、揮発性成分などの無いクリーンな脂環式構造含有熱可塑性樹脂が求められるのと同時に、該樹脂の成形に際しても異物の混入阻止や不均質スポットの発生防止が必要とされている。
An alicyclic structure-containing thermoplastic resin typified by a norbornene-based resin is excellent in transparency, low birefringence, heat resistance, low water absorption, etc., and therefore, an optical disk, a super audio CD, a magnetic disk, an optical lens, It is used as a molding material suitable for a liquid crystal display element (LCD), a light guide plate, an optical film, and the like.
In these applications, the presence of foreign matter such as dust; volatile components such as organic components and moisture; black spots and non-homogeneous spots such as unmelted particles resulting from resin burning and unmelting; Impairs characteristics, electrical characteristics, surface characteristics, etc. For this reason, a clean alicyclic structure-containing thermoplastic resin free from foreign substances and volatile components is required, and at the same time, it is necessary to prevent foreign substances from being mixed and to prevent the generation of heterogeneous spots when molding the resin. .
一方、従来からスクリュー式可塑化装置を用いたポリエチレン、ポリプロピレン等の熱可塑性樹脂の成形において、可塑化中に空気が混入して樹脂焼けを起こし、成形品中に黒点と称する炭化物の混入した不良品が発生することを防止するために、粒状の樹脂材料を可塑化装置へ供給する際、可塑化装置内へ窒素ガスを注入することが知られている。図１に示されたものは可塑化装置内へ窒素ガスを注入する公知の装置である。
図１には、ホッパ（Ａ８）の下方からガス注入管（Ａ７）を挿入し、その先端部を加熱筒（Ａ２）の樹脂材料導入口近傍（Ａ６）に設置し、窒素ガスを注入するタイプのものが示されている。
On the other hand, conventionally, in the molding of thermoplastic resins such as polyethylene and polypropylene using a screw type plasticizer, air is mixed during plasticization to cause resin burning, and the molded product is not mixed with carbides called black spots. In order to prevent generation of non-defective products, it is known that nitrogen gas is injected into the plasticizing apparatus when the granular resin material is supplied to the plasticizing apparatus. FIG. 1 shows a known apparatus for injecting nitrogen gas into a plasticizing apparatus.
In FIG. 1, a gas injection pipe (A7) is inserted from below the hopper (A8), and its tip is installed in the vicinity of the resin material inlet (A6) of the heating cylinder (A2) to inject nitrogen gas. Things are shown.
又、ペレットなどの樹脂材料を可塑化装置へ供給する装置としては、空搬式樹脂搬送装置が知られている。
空搬式樹脂搬送装置は、ペレットを、ペレットサイロ、乾燥ホッパ等から気流搬送管（ダクト、パイプ等）を通して射出成形機、押出機、ブロー成形機、真空成形機等の可塑化装置の原料供給口に接続された樹脂貯蔵筒に気流搬送する装置である。
より具体的には、気体を移動相としてペレットを樹脂貯蔵筒上部に設置したサイクロン等の搬送気体／樹脂分離部に搬送し、該分離部によってペレットと気体を分離し、ペレットを樹脂貯蔵筒に落下させ、気体は排気口から排出する。
通常は、樹脂貯蔵筒中のペレットが一定量を下回った時点で、空搬式樹脂搬送装置を作動させてペレットを樹脂貯蔵筒に移送し、樹脂貯蔵筒中のペレットが一定量に達した時点で空搬式樹脂搬送装置を停止する。
As an apparatus for supplying a resin material such as pellets to a plasticizing apparatus, an airborne resin conveying apparatus is known.
Airborne resin transfer equipment is a raw material supply port for plasticizers such as injection molding machines, extruders, blow molding machines, vacuum molding machines, etc., through pellets silos, drying hoppers, etc. through air flow transfer pipes (ducts, pipes, etc.). It is the apparatus which carries out airflow conveyance to the resin storage cylinder connected to.
More specifically, the pellet is transported to a transport gas / resin separation unit such as a cyclone installed on the top of the resin storage cylinder using gas as a mobile phase, and the pellet and the gas are separated by the separation unit. The gas is dropped and discharged from the exhaust port.
Normally, when the pellet in the resin storage cylinder falls below a certain amount, the airborne resin transport device is operated to transfer the pellet to the resin storage cylinder, and when the pellet in the resin storage cylinder reaches a certain amount, it is airborne. Stop the resin transfer device.
本発明者らは、脂環式構造含有熱可塑性樹脂の成形において、前記空搬式樹脂搬送装置を備えた熱可塑性樹脂の樹脂成形装置を用いたところ、樹脂焼けが発生し、スクリュー上に焼けた樹脂が付着し、成形品にも異物が混入した。そこで、樹脂焼けを防止するために可塑化装置内へ窒素ガスの注入を試みた。その結果、ある程度樹脂焼けが抑制されたが、大量の窒素ガスを必要とし、また、樹脂焼けを完全に防止することができなかった。
従って、本発明の課題は、空搬式樹脂搬送装置を備えた熱可塑性樹脂の樹脂成形装置を用いた成形において、樹脂焼けを防止することにある。
In the molding of the alicyclic structure-containing thermoplastic resin, the present inventors used a resin molding apparatus for a thermoplastic resin equipped with the above-described airborne resin conveying apparatus. As a result, resin burn occurred and burned on the screw. Resin adhered and foreign matter was mixed in the molded product. Therefore, in order to prevent resin burning, an attempt was made to inject nitrogen gas into the plasticizing apparatus. As a result, resin burning was suppressed to some extent, but a large amount of nitrogen gas was required, and resin burning could not be completely prevented.
Accordingly, an object of the present invention is to prevent resin burn in molding using a thermoplastic resin molding apparatus provided with an airborne resin transport apparatus.
本発明者らは、上記の課題を解決すべく、樹脂焼けの原因を突き止めるために可塑化装置の原料供給口の酸素濃度を測定したところ、空搬式樹脂搬送装置の停止時には酸素濃度が約０．５％であったが、空搬式樹脂搬送装置の作動時には酸素濃度が約２．７％に上昇しており、そのために樹脂焼けが発生していることを突き止めた。更に本発明者らは、空搬式樹脂搬送装置が作動している際の酸素濃度上昇の原因について検討したところ、空搬式樹脂搬送装置の作動時に空搬式樹脂搬送装置の搬送気体／樹脂材料分離部の圧力が大気圧に対して陰圧となり、その際に、可塑化装置等の隙間から空気が混入して酸素濃度が上昇することを突き止めた。
そこで、酸素濃度上昇の抑制を検討した結果、樹脂貯蔵筒上部にブリザー弁を設置し、樹脂貯蔵筒内の大気圧に対する陰圧の程度を小さくすることにより可塑化装置の原料供給口の酸素濃度上昇が抑制でき、可塑化装置内への酸素の混入が防止され、樹脂の焼けが発生しないことを見出し、この知見によって本発明を完成するに至った。
In order to solve the above-mentioned problems, the present inventors measured the oxygen concentration at the raw material supply port of the plasticizing apparatus in order to find out the cause of the resin burn. When the airborne resin conveying apparatus was stopped, the oxygen concentration was about 0. Although it was 0.5%, the oxygen concentration was increased to about 2.7% during the operation of the airborne resin transfer device, and it was found that the resin burn occurred. Furthermore, the present inventors have examined the cause of the increase in oxygen concentration when the airborne resin transport device is operating. When the airborne resin transport device is in operation, the transport gas / resin material separation unit of the airborne resin transport device. It was found that the air pressure was negative with respect to the atmospheric pressure, and at that time, air was mixed in from the gaps of the plasticizer and the like, resulting in an increase in the oxygen concentration.
Therefore, as a result of studying suppression of oxygen concentration rise, a blister valve was installed at the top of the resin storage cylinder, and the oxygen concentration at the raw material supply port of the plasticizer was reduced by reducing the degree of negative pressure relative to atmospheric pressure in the resin storage cylinder. It was found that the increase could be suppressed, mixing of oxygen into the plasticizing apparatus was prevented, and no resin burn occurred, and this finding led to the completion of the present invention.
かくして本発明によれば、空搬式樹脂搬送装置、樹脂貯蔵筒、ブリザー弁、不活性ガス注入装置、可塑化装置を備えた熱可塑性樹脂の樹脂成形装置であって、空搬式樹脂搬送装置の搬送気体／樹脂分離部の底部と樹脂貯蔵筒頂部が接続され、該樹脂貯蔵筒上部にブリザー弁が接続され、該樹脂貯蔵筒底部に可塑化装置の原料供給口が接続され、該可塑化装置の原料供給口近傍に不活性ガス注入装置が設置された樹脂成形装置が提供される。
樹脂成形装置は、可塑化装置がスクリュー式可塑化装置であって、スクリューホルダーのスクリュー軸受け部分とスクリューの間にグランドパッキンを備えたものであると好ましい。
又、本発明の樹脂成形装置を用いた樹脂成形方法が提供され、樹脂が脂環式構造含有樹脂であると好適である。
更に、前記樹脂成形方法により得られる成形品が提供され、成形品が光学成形品であるときに好適であり、光ディスクであるときにより好適である。
Thus, according to the present invention, there is provided a resin molding apparatus for thermoplastic resin comprising an airborne resin transport device, a resin storage cylinder, a blister valve, an inert gas injection device, and a plasticizing device, and the transport of the airborne resin transport device. The bottom of the gas / resin separation unit and the top of the resin storage cylinder are connected, a blister valve is connected to the top of the resin storage cylinder, the raw material supply port of the plasticizer is connected to the bottom of the resin storage cylinder, There is provided a resin molding apparatus in which an inert gas injection device is installed in the vicinity of a raw material supply port.
In the resin molding apparatus, it is preferable that the plasticizing apparatus is a screw type plasticizing apparatus, and a gland packing is provided between the screw bearing portion of the screw holder and the screw.
Further, a resin molding method using the resin molding apparatus of the present invention is provided, and it is preferable that the resin is an alicyclic structure-containing resin.
Furthermore, a molded product obtained by the resin molding method is provided, which is preferable when the molded product is an optical molded product, and more preferable when the molded product is an optical disk.
本発明の樹脂成形装置は、空搬式樹脂搬送装置を備えているため成形品の生産性が高く、かつ、空搬式樹脂搬送装置が作動している際にも可塑化装置の原料供給口近傍の酸素濃度が低いので樹脂の可塑化の際に樹脂焼けがほとんど発生しない。
また、空搬式樹脂搬送装置が作動している際に搬送気体／樹脂材料分離部の圧力が大気圧に対して陰圧になっても、ブリザー弁から気体が導入されて搬送気体／樹脂材料分離部へ吸引されるため、可塑化装置の原料供給口近傍の酸素濃度を低下させるための不活性ガスの搬送気体／樹脂材料分離部への吸引量を減らせ、不活性ガス注入量を減らすことが出来るので生産性及び製造コストに優れている。
更に、可塑化装置内に焼けた樹脂が付着しないので、分解清掃する必要がなく、成形装置の稼動率向上に寄与することができる。
従って、本発明の樹脂成形装置は、透明成形品の透明度が要求される光学製品の成形に好適であり、特に、脂環式構造含有熱可塑性樹脂を用いた光学製品の成形に好適である。
Since the resin molding apparatus of the present invention is equipped with an airborne resin conveying device, the productivity of the molded product is high, and even when the airborne resin conveying device is operating, the plastic molding device is near the raw material supply port of the plasticizing device. Since the oxygen concentration is low, almost no resin burn occurs during plasticization of the resin.
Also, even when the airborne resin transfer device is operating, even if the pressure of the transfer gas / resin material separation part becomes negative with respect to the atmospheric pressure, gas is introduced from the blister valve and the transfer gas / resin material is separated. The suction amount to the carrier gas / resin material separation unit for reducing the oxygen concentration in the vicinity of the raw material supply port of the plasticizer can be reduced, and the inert gas injection amount can be reduced. Because it is possible, it is excellent in productivity and manufacturing cost.
Further, since the burned resin does not adhere to the plasticizing apparatus, it is not necessary to disassemble and clean it, which can contribute to an improvement in the operating rate of the molding apparatus.
Therefore, the resin molding apparatus of the present invention is suitable for molding an optical product that requires transparency of a transparent molded product, and particularly suitable for molding an optical product using an alicyclic structure-containing thermoplastic resin.
本発明の樹脂成形装置は、空搬式樹脂搬送装置、樹脂貯蔵筒、ブリザー弁、不活性ガス注入装置、可塑化装置を備えてなり、空搬式樹脂搬送装置の搬送気体／樹脂分離部の底部と樹脂貯蔵筒頂部が接続され、該樹脂貯蔵筒上部にブリザー弁が接続され、該樹脂貯蔵筒底部に可塑化装置の原料供給口が接続され、該可塑化装置の原料供給口近傍に不活性ガス注入装置が設置されてなっている。 The resin molding apparatus of the present invention includes an airborne resin transport device, a resin storage cylinder, a blister valve, an inert gas injection device, and a plasticizing device, and includes a bottom portion of a transport gas / resin separation unit of the airborne resin transport device; The top of the resin storage cylinder is connected, the blister valve is connected to the top of the resin storage cylinder, the raw material supply port of the plasticizer is connected to the bottom of the resin storage cylinder, and the inert gas is near the raw material supply port of the plasticizer An injection device is installed.
空搬式樹脂搬送装置は、樹脂材料を、乾燥ホッパ等から気流搬送管（ダクト、パイプ等）を通して樹脂貯蔵筒に気流搬送する装置である。
より具体的には、樹脂材料を、気体を移動相として樹脂貯蔵筒頂部に接続したサイクロン等の搬送気体／樹脂材料分離部に搬送し、該分離部によって樹脂材料と気体を分離し、樹脂材料を樹脂貯蔵筒に落下させ、気体を排気口から排出させる。
The airborne resin transport device is a device that transports a resin material from a drying hopper or the like to a resin storage cylinder through an air current transport pipe (duct, pipe, etc.).
More specifically, the resin material is transported to a transport gas / resin material separation unit such as a cyclone connected to the top of the resin storage cylinder using gas as a mobile phase, and the resin material and the gas are separated by the separation unit. Is dropped into the resin storage cylinder, and the gas is discharged from the exhaust port.
空搬式樹脂搬送装置の搬送方式としては、（１）搬送気体／樹脂材料を、加圧して搬送気体／樹脂材料分離部に搬送する加圧方式や、（２）搬送気体／樹脂材料分離部の排気口を減圧することによって搬送気体／樹脂材料を吸引して搬送する吸引方式、及び、（３）これらの併用方式などが挙げられる。
搬送時の搬送気体／樹脂材料分離部の大気圧に対する圧力は、（１）加圧方式の場合には陽圧となり、（２）吸引方式の場合には陰圧となる。（３）加圧及び吸引の併用方式の場合には、陽圧となる場合と陰圧となる場合がある。
As a transport system of the airborne resin transport device, (1) a pressurization system that pressurizes the transport gas / resin material and transports it to the transport gas / resin material separation unit, or (2) a transport gas / resin material separation unit Examples thereof include a suction method for sucking and transporting the carrier gas / resin material by reducing the pressure of the exhaust port, and (3) a combination method of these.
The pressure with respect to the atmospheric pressure of the carrier gas / resin material separation part at the time of transportation is (1) a positive pressure in the case of the pressurization method, and (2) a negative pressure in the case of the suction method. (3) In the case of the combined use of pressurization and suction, there may be a positive pressure or a negative pressure.
搬送気体としては、空気、窒素などの樹脂に対して不活性の気体が使用される。搬送気体は、除塵および除湿したものが好ましい。例えば、サイクロン、フィルターなどで除塵した空気を冷却装置に通して水分を凝結させ、次いでフィルターに通して凝結水を除去し、さらに加熱、冷却、除湿を１〜３回繰り返してから使用する。 As the carrier gas, a gas inert to the resin such as air or nitrogen is used. The carrier gas is preferably dedusted and dehumidified. For example, air removed from a cyclone or a filter is passed through a cooling device to condense moisture, then passed through a filter to remove the condensed water, and heating, cooling and dehumidification are repeated 1 to 3 times before use.
図２は、空搬式樹脂搬送装置の一実施形態である、乾燥ホッパに貯蔵した熱可塑性樹脂ペレットを押出機に気流搬送する方法を示す概略説明図である。ペレットが接触する装置及び搬送気体の通る機器はフィルターを除きいずれもオーステナイト系ステンレス鋼製である。 FIG. 2 is a schematic explanatory view showing a method of air-flowing thermoplastic resin pellets stored in a dry hopper to an extruder, which is an embodiment of an airborne resin conveying device. The device in contact with the pellet and the device through which the carrier gas passes are all made of austenitic stainless steel except for the filter.
樹脂貯蔵筒は、頂部が前述の搬送気体／樹脂材料分離部に接続され、底部が可塑化装置の原料供給口に接続されており、搬送気体／樹脂材料分離部から落下した樹脂材料を貯蔵する筒である。 The resin storage cylinder has a top connected to the above-mentioned carrier gas / resin material separation unit and a bottom connected to the raw material supply port of the plasticizer, and stores the resin material dropped from the carrier gas / resin material separation unit. It is a cylinder.
不活性ガス注入装置は、樹脂材料が可塑化する際に酸素との接触を防止するために不活性ガスを注入する装置であり、その設置位置は、可塑化装置の原料供給口近傍であれば特に限定されない。具体的には、樹脂貯蔵筒下部、可塑化装置の原料供給口などが挙げられる。 The inert gas injection device is a device for injecting an inert gas to prevent contact with oxygen when the resin material is plasticized, and its installation position is near the raw material supply port of the plasticizer There is no particular limitation. Specifically, a resin storage cylinder lower part, a raw material supply port of a plasticizer, etc. are mentioned.
不活性ガスとしては、窒素、ヘリウム、アルゴンなどが挙げられるが、高純度であると好ましい。
不活性ガス注入量は、特に限定されないが、樹脂貯蔵筒のペレット空隙１０ｍＬに対して、１〜５０Ｌ／分の範囲であると好ましく、３〜２０Ｌ／分の範囲であるとより好ましく、５〜１０Ｌ／分の範囲であると特に好ましい。
不活性ガス注入量がこの範囲にあると、樹脂の焼けを防ぐ効果が高く、不活性ガスのコストの点で好ましい。
Examples of the inert gas include nitrogen, helium, and argon, but high purity is preferable.
The inert gas injection amount is not particularly limited, but is preferably in the range of 1 to 50 L / min, more preferably in the range of 3 to 20 L / min, with respect to 10 mL of the pellet void of the resin storage cylinder, A range of 10 L / min is particularly preferable.
When the inert gas injection amount is in this range, the effect of preventing the resin from burning is high, which is preferable in terms of the cost of the inert gas.
ブリザー弁は、樹脂貯蔵筒に設置され、樹脂貯蔵筒内の圧力を一定にする機能を有する弁である。例えば、樹脂貯蔵筒内の圧力が大気圧等の一定圧力より低くなると弁が開放され気体を樹脂貯蔵筒内に導入し、かつ大気圧等の一定圧力より大きくなると弁が開放され気体を樹脂貯蔵筒外に放出するものなどが挙げられ、特定の抵抗を有することにより前記機能を有するフィルターなども含まれる。
ブリザー弁を設置すると、空搬式樹脂搬送装置の作動時に、搬送気体／樹脂材料分離部が大気圧に対して陽圧である場合には、搬送気体がブリザー弁から排出され、可塑化装置の原料供給口近傍の酸素濃度の上昇が防止される。
又、搬送気体／樹脂材料分離部が大気圧に対して陰圧である場合には、ブリザー弁から気体が樹脂貯蔵筒内に導入され、貯蔵筒内の大気圧に対する陰圧の程度を下げることにより可塑化装置の隙間などからの酸素の混入を防止し、可塑化装置の原料供給口近傍の酸素濃度の上昇が防止される。
更に、搬送気体／樹脂材料分離部が大気圧に対して陰圧である場合には、可塑化装置の原料供給口近傍の不活性ガスが、搬送気体／樹脂材料分離部に吸引されず、ブリザー弁から導入された気体が吸引されるため、前述の不活性ガス注入量を減らすことができる。
The blister valve is a valve that is installed in the resin storage cylinder and has a function of keeping the pressure in the resin storage cylinder constant. For example, when the pressure in the resin storage cylinder is lower than a certain pressure such as atmospheric pressure, the valve is opened and gas is introduced into the resin storage cylinder. When the pressure is greater than a certain pressure such as atmospheric pressure, the valve is opened and the gas is stored in the resin. Examples include those that discharge to the outside of the cylinder, and also include filters that have the above-mentioned functions by having a specific resistance.
When the blister valve is installed, the carrier gas is discharged from the blister valve when the carrier gas / resin material separation part is at a positive pressure with respect to the atmospheric pressure during operation of the airborne resin carrier device. An increase in oxygen concentration in the vicinity of the supply port is prevented.
Also, when the carrier gas / resin material separation part is at a negative pressure with respect to the atmospheric pressure, gas is introduced from the blister valve into the resin storage cylinder to reduce the degree of the negative pressure with respect to the atmospheric pressure in the storage cylinder. This prevents oxygen from entering through the gaps in the plasticizer and prevents an increase in oxygen concentration near the raw material supply port of the plasticizer.
Further, when the carrier gas / resin material separation part has a negative pressure with respect to the atmospheric pressure, the inert gas in the vicinity of the raw material supply port of the plasticizing apparatus is not sucked into the carrier gas / resin material separation part, and the blister Since the gas introduced from the valve is sucked, the above-mentioned inert gas injection amount can be reduced.
ブリザー弁としては、特に限定されず公知のものを使用できるが、具体例としては、富士エンジニアリング社製；ＢＲ−２０５（ＨＥＰＡ）、金子産業社製；Ｋ１−４０などが挙げられる。 The blister valve is not particularly limited and known ones can be used. Specific examples thereof include Fuji Engineering, BR-205 (HEPA), Kaneko Sangyo, K1-40, and the like.
可塑化装置としては、特に限定されないが、射出成形機；押出機；ブロー成形機；真空成形機などが挙げられる。
中でも、スクリュー式の可塑化装置が好ましく、スクリューホルダーのスクリュー軸受け部分とスクリューの間にグランドパッキンを備えたものであると好ましい。
グランドパッキンが備えられていると、スクリュー軸受け部分とスクリューの間からの酸素混入や、充填窒素の漏れが防止されるので好ましい。
Although it does not specifically limit as a plasticizing apparatus, Injection molding machine; Extruder; Blow molding machine; Vacuum molding machine etc. are mentioned.
Among these, a screw type plasticizing device is preferable, and a gland packing is preferably provided between the screw bearing portion of the screw holder and the screw.
It is preferable that the gland packing is provided because oxygen mixing between the screw bearing portion and the screw and leakage of the filling nitrogen are prevented.
本発明においてグランドパッキンは、スクリューホルダーのスクリュー軸受け部分とスクリューの間に設けたＯ−リングであり、摩擦を低減しかつ機密性を上げるためにＯ−リングには、真空グリース等の潤滑剤を塗布しておくことが好ましい。 In the present invention, the gland packing is an O-ring provided between the screw bearing part of the screw holder and the screw. In order to reduce friction and increase confidentiality, the O-ring is provided with a lubricant such as vacuum grease. It is preferable to apply it.
スクリューとしては特に限定されないが、スクリュー表面が窒化チタンアルミであると好ましい。スクリュー表面が窒化チタンアルミであると樹脂の焼けを防ぐ効果を高くすることができる。 The screw is not particularly limited, but the screw surface is preferably titanium nitride aluminum. If the screw surface is made of titanium nitride aluminum, the effect of preventing the resin from burning can be increased.
本発明の樹脂成形装置により成形できる樹脂は熱可塑性樹脂であれば特に限定されないが、本発明の樹脂成形装置は、樹脂焼けの発生が抑制されるので、透明樹脂や、樹脂焼けが発生しやすい樹脂、ガラス転移温度の高い樹脂の成形に好適であり、脂環式構造含有熱可塑性樹脂の成形に特に好適である。 The resin that can be molded by the resin molding apparatus of the present invention is not particularly limited as long as it is a thermoplastic resin. However, since the resin molding apparatus of the present invention suppresses the occurrence of resin burn, it is easy to generate a transparent resin or resin burn. It is suitable for molding a resin or a resin having a high glass transition temperature, and is particularly suitable for molding an alicyclic structure-containing thermoplastic resin.
本発明において脂環式構造含有熱可塑性樹脂とは、脂環式構造を有する繰り返し単位を含有する重合体であって、ノルボルネン系重合体、単環シクロアルケン重合体、ビニル脂環式炭化水素重合体、芳香族ビニル系重合体、環状共役ジエン重合体及びこれらの水素化物などが挙げられる。 In the present invention, the alicyclic structure-containing thermoplastic resin is a polymer containing a repeating unit having an alicyclic structure, and is a norbornene-based polymer, monocyclic cycloalkene polymer, vinyl alicyclic hydrocarbon heavy polymer. Examples thereof include a polymer, an aromatic vinyl polymer, a cyclic conjugated diene polymer, and a hydride thereof.
ノルボルネン系重合体は、ノルボルネン系単量体の開環（共）重合体、ノルボルネン系単量体の付加（共）重合体および必要に応じてそれらの不飽和結合部分を水素化して得られる重合体などが挙げられる。
単環シクロアルケン重合体は、単環シクロアルケン単量体または環状共役ジエン単量体を付加（共）重合して不飽和結合部分を水素化することによって得られる重合体などが挙げられる。
The norbornene polymer is obtained by hydrogenating a ring-opening (co) polymer of a norbornene monomer, an addition (co) polymer of a norbornene monomer and, if necessary, an unsaturated bond portion thereof. Examples include coalescence.
Examples of the monocyclic cycloalkene polymer include a polymer obtained by addition (co) polymerization of a monocyclic cycloalkene monomer or a cyclic conjugated diene monomer to hydrogenate an unsaturated bond portion.
ビニル脂環式炭化水素重合体は、ビニルシクロアルカンの重合体；ビニルシクロアルケンの重合体またはビニルシクロアルカンもしくはビニルシクロアルケンと共重合可能な他の単量体とを（共）重合し、必要に応じてそれらの不飽和結合部分を水素化して得られる重合体などが挙げられる。 Vinyl cycloaliphatic hydrocarbon polymer is a polymer of vinyl cycloalkane; a polymer of vinyl cycloalkene or a vinyl cycloalkane or other monomer copolymerizable with vinyl cycloalkene (co) polymerization is necessary Depending on the case, polymers obtained by hydrogenating those unsaturated bond portions may be mentioned.
芳香族ビニル系重合体は、芳香族ビニル化合物または芳香族ビニル化合物と共重合可能な他の単量体とを（共）重合し、必要に応じて芳香環およびオレフィン性不飽和結合部分を水素化して得られる重合体などが挙げられる。
環状共役ジエン重合体は、環状共役ジエン単量体の付加（共）重合体及びその水素化物などが挙げられる。
Aromatic vinyl polymers (co) polymerize aromatic vinyl compounds or other monomers copolymerizable with aromatic vinyl compounds and hydrogenate aromatic rings and olefinically unsaturated bonds as necessary. Examples thereof include polymers obtained by conversion.
Examples of the cyclic conjugated diene polymer include an addition (co) polymer of a cyclic conjugated diene monomer and a hydride thereof.
本発明において、樹脂材料の形状は特に限定されず、ペレット、粉末などが挙げられるが、可塑化の際の黒点発生の防止、移送の容易さの点で、ペレットが好ましい。
ペレットとは、成形用樹脂材料であって、熱可塑性樹脂単独を、または、熱可塑性樹脂に必要に応じて配合剤を配合した混合物を、溶融、混練した後、平均代表長さ、通常、０．５〜２０ｍｍ、好ましくは１〜１０ｍｍの大きさの粒にしたものである。
ここで代表長さとは投影した場合に最大となる部位の長さを言う。
In the present invention, the shape of the resin material is not particularly limited, and examples thereof include pellets and powders. However, pellets are preferable in terms of prevention of black spot generation during plasticization and ease of transfer.
The pellet is a resin material for molding, and is obtained by melting and kneading a thermoplastic resin alone or a mixture in which a thermoplastic resin is blended with a compounding agent as necessary, and then an average representative length, usually 0. 0.5-20 mm, preferably 1-10 mm in size.
Here, the representative length means the length of the maximum portion when projected.
光ディスク、スーパーオーディオＣＤ、光学フィルム等を製造する場合、熱可塑性樹脂には有機成分や水分がほとんど検出されないことが好ましいので、熱可塑性樹脂を乾燥ホッパに一定時間滞留させてから成形に供することが好ましい。乾燥ホッパでは、下部のコーン部中央に届くよう外部から挿入されたノズルから乾燥気体が通気されて貯蔵ペレットから揮発成分が除去される。 When manufacturing optical discs, super audio CDs, optical films, etc., it is preferable that organic components and moisture are hardly detected in the thermoplastic resin, so the thermoplastic resin can be retained in a dry hopper for a certain period of time before being used for molding. preferable. In the drying hopper, dry gas is vented from a nozzle inserted from the outside so as to reach the center of the lower cone portion, and volatile components are removed from the stored pellets.
本発明の樹脂成形装置により得られる成形品は、黒点や異物がほとんど存在しないので、光学特性、電気特性、表面特性などに優れる。
このような特性から、本発明の樹脂成形装置は、光ディスク；スーパーオーディオＣＤ；光ファイバー、カメラ用レンズ、オーバーヘッドプロジェクター用レンズ、ＬＢＰ用Ｆθレンズ、プリズム、液晶表示素子（ＬＣＤ）、光拡散板、導光板、偏光フィルム、位相差フィルム、輝度向上フィルム、集光フィルムなどの光学成形品；液体薬品容器、アンプル、輸液用バッグ、点眼薬容器、半導体用ウエハ格納容器などの各種清浄容器；注射器、医療用輸液チューブなどの医療器材；の成形装置として好適であり、光学成形品の成形装置としてより好適であり、光ディスクの成形装置として特に好適である。
The molded product obtained by the resin molding apparatus of the present invention is excellent in optical characteristics, electrical characteristics, surface characteristics and the like since there are almost no black spots or foreign matters.
Because of these characteristics, the resin molding apparatus of the present invention has an optical disc; a super audio CD; an optical fiber, a camera lens, an overhead projector lens, an LBP Fθ lens, a prism, a liquid crystal display element (LCD), a light diffusing plate, a light guide plate. Optical molded products such as optical plates, polarizing films, retardation films, brightness enhancement films, condensing films; various clean containers such as liquid chemical containers, ampoules, infusion bags, eye drops containers, semiconductor wafer storage containers; syringes, medical It is suitable as a molding apparatus for medical equipment such as an infusion tube for medical use, more suitable as a molding apparatus for optical molded products, and particularly suitable as a molding apparatus for optical disks.
以下、本発明を図面に示す一実施形態に基づいて説明する。
図３は、空搬式樹脂搬送装置、樹脂貯蔵筒、ブリザー弁、不活性ガス注入装置、可塑化装置を備えた熱可塑性樹脂の樹脂成形装置であって、空搬式樹脂搬送装置の搬送気体／樹脂分離部の底部と樹脂貯蔵筒頂部が接続され、該樹脂貯蔵筒上部にブリザー弁が接続され、該樹脂貯蔵筒底部に可塑化装置の原料供給口が接続され、該可塑化装置の原料供給口近傍に不活性ガス注入装置が設置された樹脂成形装置を示す概略説明図である。
Hereinafter, the present invention will be described based on an embodiment shown in the drawings.
FIG. 3 shows a resin molding apparatus for a thermoplastic resin provided with an airborne resin transport device, a resin storage cylinder, a blister valve, an inert gas injection device, and a plasticizer, and the transport gas / resin of the airborne resin transport device The bottom of the separation unit and the top of the resin storage cylinder are connected, a blister valve is connected to the top of the resin storage cylinder, the raw material supply port of the plasticizer is connected to the bottom of the resin storage cylinder, and the raw material supply port of the plasticizer It is a schematic explanatory drawing which shows the resin molding apparatus by which the inert gas injection apparatus was installed in the vicinity.
樹脂貯蔵筒（Ｃ６）頂部は、空搬式樹脂搬送装置の搬送気体／樹脂分離部（Ｃ１３）の底部に接続されており、樹脂貯蔵筒底部は、スクリュー式射出成形機（可塑化装置）の原料供給口に接続されている。
樹脂貯蔵筒内に堆積しているペレットの空隙部分は、樹脂貯蔵筒底部下部に設置された不活性ガス注入装置（Ｃ２）から導入される不活性ガスにより窒素置換されている。
ペレットの量が樹脂貯蔵筒に設置されたレベル計（Ｃ１４）を下回ると、空搬式樹脂搬送装置が作動し、ペレット及び搬送気体が搬送管（Ｃ５）を通してペレット／搬送気体分離部（Ｃ１３）に導入される。
ペレット及び搬送気体は、該分離部（Ｃ１３）においてペレットと気体に分離され、搬送気体はフィルター（Ｃ３）を通して、搬送気体排気管（Ｃ４）から排出され、ペレットは樹脂貯蔵筒（Ｃ６）に落下し堆積する。
ブリザー弁（Ｃ７）は、樹脂貯蔵筒上部に設置され、ペレット／搬送気体分離部が大気圧に対して陰圧となった際には、外部から気体を導入し、該可塑化装置の原料供給口近傍の酸素濃度の上昇を防止している。
図４は、空搬式樹脂搬送装置の搬送気体／樹脂分離部の底部と樹脂貯蔵筒頂部が接続され、該樹脂貯蔵筒上部にブリザー弁が接続され、該樹脂貯蔵筒底部に可塑化装置の原料供給口が接続され、該可塑化装置の原料供給口近傍に不活性ガス注入装置が設置された樹脂成形装置であって、可塑化装置がスクリュー式可塑化装置でありかつ、スクリューホルダーのスクリュー軸受け部分とスクリューの間にグランドパッキンを備えた樹脂成形装置を示す概略説明図である。
スクリューホルダー（Ｃ１）のスクリュー軸受け（Ｃ９）とスクリュー（Ｃ１２）の間にはグランドパッキン（Ｃ１０）が設置されており、該可塑化装置内からの封入窒素の漏れ及び、該可塑化装置内への酸素の混入を防止している。
The top of the resin storage cylinder (C6) is connected to the bottom of the transport gas / resin separation section (C13) of the airborne resin transport apparatus, and the bottom of the resin storage cylinder is the raw material of the screw type injection molding machine (plasticizer) Connected to the supply port.
The void portion of the pellet accumulated in the resin storage cylinder is replaced with nitrogen by an inert gas introduced from an inert gas injection device (C2) installed at the bottom lower part of the resin storage cylinder.
When the amount of pellets falls below the level meter (C14) installed in the resin storage cylinder, the airborne resin transfer device is activated, and the pellets and the transfer gas pass through the transfer pipe (C5) to the pellet / transfer gas separation unit (C13). be introduced.
The pellet and carrier gas are separated into pellets and gas in the separation part (C13), the carrier gas is discharged from the carrier gas exhaust pipe (C4) through the filter (C3), and the pellet falls into the resin storage cylinder (C6). And deposit.
The blister valve (C7) is installed in the upper part of the resin storage cylinder, and when the pellet / conveying gas separation part becomes a negative pressure with respect to the atmospheric pressure, a gas is introduced from the outside to supply the raw material of the plasticizer The increase in oxygen concentration near the mouth is prevented.
FIG. 4 shows that the bottom of the transport gas / resin separation unit of the airborne resin transport device and the top of the resin storage cylinder are connected, a blister valve is connected to the top of the resin storage cylinder, and the plasticizer raw material is at the bottom of the resin storage cylinder A resin molding device in which a supply port is connected and an inert gas injection device is installed in the vicinity of a raw material supply port of the plasticizing device, wherein the plasticizing device is a screw type plasticizing device and a screw bearing of a screw holder It is a schematic explanatory drawing which shows the resin molding apparatus provided with the gland packing between the part and the screw.
A gland packing (C10) is installed between the screw bearing (C9) and the screw (C12) of the screw holder (C1), and leakage of sealed nitrogen from inside the plasticizing apparatus and into the plasticizing apparatus. To prevent oxygen contamination.
以下、本発明について、参考例、実施例および比較例を挙げて、より具体的に説明する。ただし本発明は、これらの実施例に限定されるものではない。以下において、部または％は、特に断りがない限り重量基準である。 Hereinafter, the present invention will be described more specifically with reference to reference examples, examples and comparative examples. However, the present invention is not limited to these examples. In the following, “part” or “%” is based on weight unless otherwise specified.
以下の実施例および比較例における各種物性の測定法は次の通りである。
（１）水素添加率
脂環式構造含有熱可塑性樹脂の不飽和結合への水素転化率は、１Ｈ−ＮＭＲにより測定した。
（２）ガラス転移温度（Ｔｇ）
脂環式構造含有熱可塑性樹脂のＴｇは、ＪＩＳ Ｋ７１２１に基づいて示差走査型熱量計により昇温速度１０℃／分の条件で測定した。
（３）分子量
脂環式構造含有熱可塑性樹脂の分子量は、シクロヘキサンを溶媒にして、４０℃でゲルパーミエーションクロマトグラフィー（ＧＰＣ）により測定し、標準ポリイソプレン換算の数平均分子量（Ｍｎ）および重量平均分子量（Ｍｗ）を求めた。
（４）可塑化装置の原料供給口の最大酸素濃度
コンパクト酸素分析計（ニュートロニックス社製 ＭＯＤＥＬ３１００）を可塑化装置の原料供給口に設置し、成形中、経時的に酸素濃度（重量％）を測定し、最大となった値を最大酸素濃度とした。
（５）樹脂焼け
ディスク単板を１７０００枚成形した時点で成形を停止し、射出成形機を分解してスクリューを取り出し焼けた樹脂の付着を目視で確認し、スクリュー表面積に対して樹脂焼けが付着した面積が５％未満であるときを◎、５％〜１０％であるときを○、５０〜８０％であるときを△、８０〜１００％であるときを×として評価した。
The measuring methods of various physical properties in the following examples and comparative examples are as follows.
(1) Hydrogenation rate The hydrogen conversion rate to the unsaturated bond of the alicyclic structure-containing thermoplastic resin was measured by 1 H-NMR.
(2) Glass transition temperature (Tg)
Tg of the alicyclic structure-containing thermoplastic resin was measured by a differential scanning calorimeter based on JIS K7121 at a temperature increase rate of 10 ° C./min.
(3) Molecular weight The molecular weight of the alicyclic structure-containing thermoplastic resin was measured by gel permeation chromatography (GPC) at 40 ° C. using cyclohexane as a solvent, and the number average molecular weight (Mn) and weight in terms of standard polyisoprene. Average molecular weight (Mw) was determined.
(4) Maximum oxygen concentration at the raw material supply port of the plasticizing device A compact oxygen analyzer (MODEL3100 manufactured by Neutronics) is installed at the raw material supply port of the plasticizing device, and the oxygen concentration (wt%) is measured over time during molding. The maximum value was measured as the maximum oxygen concentration.
(5) Resin burn When 17,000 discs are molded, molding is stopped, the injection molding machine is disassembled, the screw is taken out, the adhesion of the burned resin is visually confirmed, and the resin burn adheres to the screw surface area. When the area was less than 5%, ％ was evaluated when it was 5% to 10%, Δ when it was 50 to 80%, and × when it was 80 to 100%.
［参考例１：脂環式構造含有熱可塑性樹脂の製造］
６−メチル−１，４：５，８−ジメタノ−１，４，４ａ，５，６，７，８，８ａ−オクタヒドロナフタレン（以下、ＭＴＤと記す。）９０％と５−メチル−２−ノルボルネン（以下、ＭＮＢと記す。）１０％からなる単量体混合物を、開環重合触媒を用いて重合して得られた開環共重合体１００部をシクロヘキサン４００部に溶解し、水素添加触媒としてニッケル−アルミナ触媒（日揮化学社製）５部を加え、水素によりゲージ圧５ＭＰａＧに加圧して、攪拌しながら温度２００℃まで加温し、次いで４時間反応させ、ＭＴＤ−ＭＮＢ開環共重合体水素添加物を得た。水素添加後の反応溶液を、ＭＴＤ−ＭＮＢ開環共重合体水素添加物含量２０％となるようにシクロヘキサンにて希釈し、珪藻土（ラジオライト＃５００）を濾過床として、加圧濾過機（フンダフイルター、石川島播磨重工社製）を使用し、圧力０．２５ＭＰａで加圧濾過して、無色透明のＭＴＤ−ＭＮＢ開環共重合体水素添加物溶液Ｉを得た。
[Reference Example 1: Production of alicyclic structure-containing thermoplastic resin]
6-methyl-1,4: 5,8-dimethano-1,4,4a, 5,6,7,8,8a-octahydronaphthalene (hereinafter referred to as MTD) 90% and 5-methyl-2- 100 parts of a ring-opening copolymer obtained by polymerizing a monomer mixture consisting of 10% norbornene (hereinafter referred to as MNB) using a ring-opening polymerization catalyst is dissolved in 400 parts of cyclohexane, and a hydrogenation catalyst is obtained. 5 parts of nickel-alumina catalyst (manufactured by JGC Chemical Co., Ltd.) was added, and the gauge pressure was increased to 5 MPaG with hydrogen. The mixture was heated to 200 ° C. with stirring, then reacted for 4 hours, and MTD-MNB ring-opening copolymer A combined hydrogenated product was obtained. The reaction solution after hydrogenation was diluted with cyclohexane so that the content of hydrogenated MTD-MNB ring-opening copolymer was 20%, diatomaceous earth (Radiolite # 500) was used as a filter bed, and a pressure filter (funda Using a filter (manufactured by Ishikawajima-Harima Heavy Industries Co., Ltd.), pressure filtration was performed at a pressure of 0.25 MPa to obtain a colorless and transparent MTD-MNB ring-opening copolymer hydrogenated solution I.
１００部のＭＴＤ−ＭＮＢ開環共重合体水素添加物溶液Ｉを、更に金属ファイバー製フィルター（口径３μｍ、ニチダイ社製）で濾過した後、ゼータープラスフィルター１０Ｈ（口径０．５〜１μｍ、キュノ社製）にて濾過し、更に金属ファイバー製フィルター（口径０．２μｍ、ニチダイ社製）にて濾過して異物を除去し、得られた濾液に、それぞれシクロヘキサンに溶解した酸化防止剤（イルガノックス１０１０、チバスペシャリティケミカルズ社製）、およびゴム質重合体（タフテックＨ１０５２、旭化成社製）を、いずれもＭＴＤ−ＭＮＢ開環共重合体水素添加物１００部に対して０．２部となるように、溶液にて添加した。その後、シクロヘキサンを円筒形濃縮乾燥器（日立製作所社製）を用いて、運転条件を第１ステップ（温度２７０℃、圧力１３．３ｋＰａ）、第２ステップ（温度２７０℃、圧力６６７Ｐａ）として除去した。得られた樹脂組成物をクラス１０００のクリーンルーム内で、押出機にかけて溶融状態でダイから押し出し、水冷した後、ペレタイザ（ＯＳＰ−２、長田製作所製）に通して３ｍｍ径のストランドとし、ストランドカッターで長さ３ｍｍづつに切断してＭＴＤ−ＭＮＢ開環共重合体水素添加物ペレット１８部を得た。ペレットは表面を研磨したステンレス製密閉容器に保管した。ペレット１０重量％のトルエン溶液をガスクロマトグラフィーで分析した結果、残留シクロヘキサン量は測定限界以下であった。ＭＴＤ−ＭＮＢ開環共重合体水素添加物は無色透明で、Ｍｗ４２０００、Ｍｎ１８０００、Ｔｇ１４０℃、水素添加率はほぼ１００％であった。 100 parts of MTD-MNB ring-opening copolymer hydrogenated solution I was further filtered through a metal fiber filter (caliber 3 μm, manufactured by Nichidai), and then zeta plus filter 10H (caliber 0.5-1 μm, Cuno). The product is then filtered through a metal fiber filter (caliber 0.2 μm, manufactured by Nichidai Co., Ltd.) to remove foreign matter, and the resulting filtrate is respectively dissolved in cyclohexane with an antioxidant (Irganox 1010). , Manufactured by Ciba Specialty Chemicals Co., Ltd.), and rubber polymer (Tuftec H1052, manufactured by Asahi Kasei Co., Ltd.), so that both are 0.2 parts with respect to 100 parts of the MTD-MNB ring-opening copolymer hydrogenated product, Added in solution. Then, cyclohexane was removed as a first step (temperature 270 ° C., pressure 13.3 kPa) and a second step (temperature 270 ° C., pressure 667 Pa) using a cylindrical concentrating dryer (manufactured by Hitachi, Ltd.). . The obtained resin composition was extruded from a die in a molten state in a class 1000 clean room, extruded from a die, cooled with water, passed through a pelletizer (OSP-2, manufactured by Nagata Seisakusho) to form a 3 mm diameter strand, and a strand cutter. It was cut into 3 mm lengths to obtain 18 parts of MTD-MNB ring-opening copolymer hydrogenated pellets. The pellets were stored in a sealed stainless steel container whose surface was polished. As a result of analyzing a 10% by weight pellet solution in toluene by gas chromatography, the amount of residual cyclohexane was below the measurement limit. The hydrogenated MTD-MNB ring-opening copolymer was colorless and transparent, Mw 42000, Mn 18000, Tg 140 ° C., and the hydrogenation rate was almost 100%.
［実施例１］
参考例１により得られたペレットを樹脂材料として、図３で示される、空搬式樹脂搬送装置、樹脂貯蔵筒、ブリザー弁、不活性ガス注入装置、可塑化装置を備えた熱可塑性樹脂の樹脂成形装置であって、空搬式樹脂搬送装置の搬送気体／樹脂分離部の底部と樹脂貯蔵筒頂部が接続され、該樹脂貯蔵筒上部にブリザー弁が接続され、該樹脂貯蔵筒底部に可塑化装置の原料供給口が接続され、該可塑化装置の原料供給口近傍に不活性ガス注入装置が設置された樹脂成形装置を用いて、スーパーオーディオＣＤのディスク単板を成型した。
可塑化装置としては、スーパーオーディオＣＤ高記録密度層用のスタンパーを装着した射出成形機（ＳＤ４０ＥＲ、住友重機械工業社製）を用いた。
成形条件としては、樹脂成形装置を、クリーン度がクラス１０００であるクリーンルーム内に設置し、樹脂温度（バレル設定最高温度）を３７５℃、金型温度を固定側１０３℃、可動側１０５℃とした。
ペレットは成形直前まで、乾燥機中で１００℃、４時間加熱処理を行った。
不活性ガスとしては、純度９９．９９％の窒素を用い、１０Ｌ／分の供給速度で導入した。
ブリザー弁としては、富士エンジニアリング社製；ＢＲ−２０５（ＨＥＰＡ）を用いた。
射出成形機のスクリューは、窒化チタンアルミでコーティングしたものを用いた。
結果を表１に示す。
[Example 1]
Using the pellets obtained in Reference Example 1 as a resin material, resin molding of a thermoplastic resin provided with an airborne resin conveying device, a resin storage cylinder, a blister valve, an inert gas injection device, and a plasticizing device shown in FIG. A bottom part of the transport gas / resin separation part of the airborne resin transport device and a top part of the resin storage cylinder, a blister valve is connected to the top part of the resin storage cylinder, and a plasticizer is connected to the bottom part of the resin storage cylinder. A single disc of Super Audio CD was molded using a resin molding apparatus in which a raw material supply port was connected and an inert gas injection device was installed near the raw material supply port of the plasticizer.
As a plasticizing apparatus, an injection molding machine (SD40ER, manufactured by Sumitomo Heavy Industries, Ltd.) equipped with a stamper for a high recording density layer of Super Audio CD was used.
As molding conditions, the resin molding apparatus was installed in a clean room with a clean degree of class 1000, the resin temperature (barrel set maximum temperature) was 375 ° C., the mold temperature was 103 ° C. on the fixed side, and 105 ° C. on the movable side. .
The pellets were heat-treated at 100 ° C. for 4 hours in a dryer until just before molding.
As the inert gas, nitrogen having a purity of 99.99% was used and introduced at a supply rate of 10 L / min.
As a blizzer valve, BR-205 (HEPA) manufactured by Fuji Engineering Co., Ltd. was used.
The screw of the injection molding machine was coated with titanium nitride aluminum.
The results are shown in Table 1.
［実施例２］
樹脂成形装置として図４で示される、実施例１で用いた射出成形機のスクリュー軸受け部分とスクリューの間に真空グリースを塗布したグランドパッキンを備えた樹脂成形装置を用いた以外は実施例１と同様に成形を行った。結果を表１に示す。
[Example 2]
The resin molding apparatus shown in FIG. 4 is the same as in Example 1 except that a resin molding apparatus having a gland packing in which vacuum grease is applied between the screw bearing portion of the injection molding machine used in Example 1 and the screw is used. Molding was performed in the same manner. The results are shown in Table 1.
［比較例１］
樹脂成形装置として図５で示される、実施例１で用いた射出成形機のブリザー弁、グランドパッキンの無い樹脂成形装置を用いた以外は実施例１と同様に成形を行った。結果を表１に示す。
［比較例２］
窒素流量を０Ｌ／分にした以外は、比較例1と同様に成形を行った。結果を表１に示す。
[Comparative Example 1]
Molding was performed in the same manner as in Example 1 except that the resin molding apparatus shown in FIG. 5 was a blister valve of the injection molding machine used in Example 1 and a resin molding apparatus without a gland packing. The results are shown in Table 1.
[Comparative Example 2]
Molding was performed in the same manner as in Comparative Example 1 except that the nitrogen flow rate was 0 L / min. The results are shown in Table 1.
表１から以下の事がわかる。
空搬式樹脂搬送装置、樹脂貯蔵筒、ブリザー弁、不活性ガス注入装置、可塑化装置を備えた熱可塑性樹脂の樹脂成形装置であって、空搬式樹脂搬送装置の搬送気体／樹脂分離部の底部と樹脂貯蔵筒頂部が接続され、該樹脂貯蔵筒上部にブリザー弁が接続され、該樹脂貯蔵筒底部に可塑化装置の原料供給口が接続され、該可塑化装置の原料供給口近傍に不活性ガス注入装置が設置された樹脂成形装置は、成形の際に、該可塑化装置の原料供給口近傍の酸素濃度が低く、酸素の混入による樹脂の焼けが発生しない（実施例１及び２）。
それに対して、ブリザー弁がない樹脂成形装置は、成形の際に、該可塑化装置の原料供給口近傍の酸素濃度が高く、酸素の混入による樹脂の焼けが発生した（比較例１及び２）。
Table 1 shows the following.
A resin molding apparatus for a thermoplastic resin equipped with an airborne resin transport device, a resin storage cylinder, a blister valve, an inert gas injection device, and a plasticizing device, and the bottom of the transport gas / resin separation unit of the airborne resin transport device Is connected to the top of the resin storage cylinder, a blister valve is connected to the top of the resin storage cylinder, the raw material supply port of the plasticizer is connected to the bottom of the resin storage cylinder, and is inactive near the raw material supply port of the plasticizer The resin molding apparatus provided with the gas injection apparatus has a low oxygen concentration in the vicinity of the raw material supply port of the plasticizing apparatus during molding, so that the resin is not burnt due to the mixing of oxygen (Examples 1 and 2).
On the other hand, the resin molding apparatus without the blister valve has a high oxygen concentration in the vicinity of the raw material supply port of the plasticizing apparatus during the molding, and the resin is burnt due to the mixing of oxygen (Comparative Examples 1 and 2). .
本発明の樹脂成形装置は、空搬式樹脂搬送装置を用いることで、樹脂材料の連続供給が可能であり、導入窒素の量も少量であるため生産性及び製造コストに優れ、更に、樹脂焼けを防止できるので、透明成形品の透明度が要求される光学製品の成形に好適であり、特に、脂環式構造含有熱可塑性樹脂を用いた光学製品の成形に好適である。 The resin molding apparatus of the present invention is capable of continuous supply of resin material by using an airborne resin conveying apparatus, and is excellent in productivity and manufacturing cost because the amount of introduced nitrogen is small, and further, can be used for resin burning. Therefore, it is suitable for molding optical products that require transparency of a transparent molded product, and particularly suitable for molding optical products using an alicyclic structure-containing thermoplastic resin.
Ｐ：樹脂材料
Ａ１：可塑化装置 Ａ２：加熱筒
Ａ３：ヒーター Ａ４：スクリュー
Ａ５：駆動装置 Ａ６：樹脂材料入口
Ａ７：ガス注入管 Ａ８：ホッパ
Ｂ１：乾燥ホッパ Ｂ２：樹脂貯蔵筒
Ｂ３：送風機 Ｂ４：除塵フィルター
Ｂ５：冷却機 Ｂ６：除湿フィルター
Ｂ７：ヒーター Ｂ８：スピンダンパ
Ｂ９：搬送管 Ｂ１０：送風機
Ｂ１１：押出機
Ｃ１：スクリューホルダー
Ｃ２：不活性ガス注入装置
Ｃ３：フィルター Ｃ４：搬送気体排気管
Ｃ５：搬送管 Ｃ６：樹脂貯蔵筒
Ｃ７：ブリザー弁 Ｃ８：酸素濃度計
Ｃ９：スクリュー軸受け
Ｃ１０：グランドパッキン
Ｃ１１：駆動装置 Ｃ１２：スクリュー
Ｃ１３：搬送気体／樹脂分離部
Ｃ１４：レベル計
P: Resin material A1: Plasticizer A2: Heating cylinder A3: Heater A4: Screw A5: Drive device A6: Resin material inlet A7: Gas injection pipe A8: Hopper B1: Drying hopper B2: Resin storage cylinder B3: Blower B4: Dust removal filter B5: Cooling machine B6: Dehumidification filter B7: Heater B8: Spin damper B9: Transport pipe B10: Blower B11: Extruder C1: Screw holder C2: Inert gas injection device C3: Filter C4: Transport gas exhaust pipe C5: Transport Tube C6: Resin storage cylinder C7: Blister valve C8: Oxygen concentration meter C9: Screw bearing C10: Gland packing C11: Drive device C12: Screw C13: Transport gas / resin separation unit C14: Level meter
Claims (7)
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101293393B (en) * | 2007-04-28 | 2010-12-01 | 株式会社名机制作所 | Light guide plate forming mold and light guide plate forming method |
| KR20160004212A (en) * | 2014-07-01 | 2016-01-12 | 주식회사 카와타 | Method and machine for pre-processing of modling material, injection molding machine, and injection molding method |
| JP2018165003A (en) * | 2017-03-28 | 2018-10-25 | 三井化学株式会社 | Method for producing cyclic olefin resin molded article |
| JP2021096018A (en) * | 2019-12-16 | 2021-06-24 | 国立研究開発法人産業技術総合研究所 | Resin dryer, and resin drying method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101293393B (en) * | 2007-04-28 | 2010-12-01 | 株式会社名机制作所 | Light guide plate forming mold and light guide plate forming method |
| KR20160004212A (en) * | 2014-07-01 | 2016-01-12 | 주식회사 카와타 | Method and machine for pre-processing of modling material, injection molding machine, and injection molding method |
| KR102294128B1 (en) * | 2014-07-01 | 2021-08-27 | 주식회사 카와타 | Method and machine for pre-processing of molding material, injection molding machine, and injection molding method |
| JP2018165003A (en) * | 2017-03-28 | 2018-10-25 | 三井化学株式会社 | Method for producing cyclic olefin resin molded article |
| JP2021096018A (en) * | 2019-12-16 | 2021-06-24 | 国立研究開発法人産業技術総合研究所 | Resin dryer, and resin drying method |
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