JPH0116655B2 - - Google Patents
Info
- Publication number
- JPH0116655B2 JPH0116655B2 JP56174350A JP17435081A JPH0116655B2 JP H0116655 B2 JPH0116655 B2 JP H0116655B2 JP 56174350 A JP56174350 A JP 56174350A JP 17435081 A JP17435081 A JP 17435081A JP H0116655 B2 JPH0116655 B2 JP H0116655B2
- Authority
- JP
- Japan
- Prior art keywords
- air
- die
- inner lip
- lip
- cylindrical film
- 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.)
- Expired
Links
- 238000000465 moulding Methods 0.000 claims description 13
- 230000000694 effects Effects 0.000 claims description 7
- -1 polyethylene Polymers 0.000 description 7
- 229920005989 resin Polymers 0.000 description 7
- 239000011347 resin Substances 0.000 description 7
- 229920001903 high density polyethylene Polymers 0.000 description 6
- 239000004700 high-density polyethylene Substances 0.000 description 6
- 229920000092 linear low density polyethylene Polymers 0.000 description 6
- 239000004707 linear low-density polyethylene Substances 0.000 description 5
- 239000004698 Polyethylene Substances 0.000 description 4
- 229920001577 copolymer Polymers 0.000 description 4
- 229920000573 polyethylene Polymers 0.000 description 4
- 125000006850 spacer group Chemical group 0.000 description 3
- 229920003002 synthetic resin Polymers 0.000 description 3
- 239000000057 synthetic resin Substances 0.000 description 3
- 229920001169 thermoplastic Polymers 0.000 description 3
- 239000004416 thermosoftening plastic Substances 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- PPBRXRYQALVLMV-UHFFFAOYSA-N Styrene Chemical compound C=CC1=CC=CC=C1 PPBRXRYQALVLMV-UHFFFAOYSA-N 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 2
- 229920001684 low density polyethylene Polymers 0.000 description 2
- 239000004702 low-density polyethylene Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 229920005672 polyolefin resin Polymers 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000004711 α-olefin Substances 0.000 description 2
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 1
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 1
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 1
- JHWNWJKBPDFINM-UHFFFAOYSA-N Laurolactam Chemical compound O=C1CCCCCCCCCCCN1 JHWNWJKBPDFINM-UHFFFAOYSA-N 0.000 description 1
- 239000004677 Nylon Substances 0.000 description 1
- 229920000571 Nylon 11 Polymers 0.000 description 1
- 229920000299 Nylon 12 Polymers 0.000 description 1
- 229920002292 Nylon 6 Polymers 0.000 description 1
- 229920002302 Nylon 6,6 Polymers 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 229920001328 Polyvinylidene chloride Polymers 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 229920002433 Vinyl chloride-vinyl acetate copolymer Polymers 0.000 description 1
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 description 1
- 229920001893 acrylonitrile styrene Polymers 0.000 description 1
- 150000001408 amides Chemical class 0.000 description 1
- IAQRGUVFOMOMEM-UHFFFAOYSA-N butene Natural products CC=CC IAQRGUVFOMOMEM-UHFFFAOYSA-N 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- AFFLGGQVNFXPEV-UHFFFAOYSA-N n-decene Natural products CCCCCCCCC=C AFFLGGQVNFXPEV-UHFFFAOYSA-N 0.000 description 1
- 229920001778 nylon Polymers 0.000 description 1
- 229920001748 polybutylene Polymers 0.000 description 1
- 229920001707 polybutylene terephthalate Polymers 0.000 description 1
- 239000005020 polyethylene terephthalate Substances 0.000 description 1
- 229920000139 polyethylene terephthalate Polymers 0.000 description 1
- 229920002223 polystyrene Polymers 0.000 description 1
- 239000004800 polyvinyl chloride Substances 0.000 description 1
- 229920000915 polyvinyl chloride Polymers 0.000 description 1
- 239000005033 polyvinylidene chloride Substances 0.000 description 1
- SCUZVMOVTVSBLE-UHFFFAOYSA-N prop-2-enenitrile;styrene Chemical compound C=CC#N.C=CC1=CC=CC=C1 SCUZVMOVTVSBLE-UHFFFAOYSA-N 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/885—External treatment, e.g. by using air rings for cooling tubular films
-
- 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
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
-
- 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
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9115—Cooling of hollow articles
- B29C48/912—Cooling of hollow articles of tubular films
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Heating, Cooling, Or Curing Plastics Or The Like In General (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Description
【発明の詳細な説明】
本発明はインフレーシヨンフイルム成形装置に
係る。詳しくは、バブルを安定化させ、高速成
形、高ブローアツプ比を可能とし、厚みむらのな
いフイルムを高能率に製造し得るインフレーシヨ
ンフイルム成形装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an inflation film forming apparatus. Specifically, the present invention relates to an inflation film forming apparatus that stabilizes bubbles, enables high-speed molding, high blow-up ratio, and can efficiently produce films with uniform thickness.
従来インフレーシヨン成形、すなわち、円形ス
リツトを有するダイから溶融樹脂を筒状に押出
し、この筒状体の内部に空気等の気体を吹き込ん
で膨張させ、筒状のフイルムを得ることが行なわ
れている。 Conventionally, inflation molding has been carried out, in which a molten resin is extruded into a cylindrical shape through a die having a circular slit, and a gas such as air is blown into the cylindrical body to expand it, thereby obtaining a cylindrical film. There is.
そして、このダイから押出された筒状フイルム
をダイの近傍に設けられたエアーリングにより冷
却することも知られている。 It is also known that the cylindrical film extruded from the die is cooled by an air ring provided near the die.
しかしながら、このような従来のインフレーシ
ヨンフイルム成形装置はバブルを安定化するのが
まだ充分でなく、高速成形、高ブローアツプ成形
等には使用し得ない。 However, such conventional inflation film forming apparatuses do not sufficiently stabilize bubbles, and cannot be used for high speed molding, high blow-up molding, etc.
特に密度0.94以上の高密度ポリエチレンや近年
注目を集めている線状低密度ポリエチレン等の溶
融張力の低い熱可塑性合成樹脂を使用してフイル
ムインフレーシヨン成形することは大変難かしか
つた。 In particular, it is extremely difficult to perform film inflation molding using thermoplastic synthetic resins with low melt tension, such as high-density polyethylene with a density of 0.94 or higher and linear low-density polyethylene, which has been attracting attention in recent years.
本発明者は、このような現状に鑑み、高密度ポ
リエチレンや線状低密度ポリエチレン等を用いて
高速成形、高ブローアツプ成形が行ない得るイン
フレーシヨンフイルム成形装置を提供するべく鋭
意検討を行なつた結果、エアーリングを特殊な構
造とすることにより問題を解決し本発明を完成し
た。 In view of the current situation, the inventors of the present invention have conducted intensive studies in order to provide a blown film molding device that can perform high-speed molding and high blow-up molding using high-density polyethylene, linear low-density polyethylene, etc. As a result, the problem was solved by making the air ring have a special structure, and the present invention was completed.
円形スリツトを有するインフレーシヨン成形用
ダイと、該ダイの円形スリツトを囲繞するように
設けられたエアーリングとからなり、該エアーリ
ングの空気吹出口を、円形スリツトから押出され
た筒状フイルムを引取方向に向つて拡径されたテ
ーパー面を有する外側リツプと該外側リツプより
ダイ側に設けられた内側リツプとの間に形成し、
該内側リツプとダイとの間には空気吸引孔を形成
し、かつエアーリングをダイに密着させて設ける
ことにより、エアーリングの内側リツプとダイと
の間に減圧域を形成する構造としたことを特徴と
するインフレーシヨンフイルム成形装置に存す
る。 It consists of an inflation molding die having a circular slit, and an air ring provided so as to surround the circular slit of the die. formed between an outer lip having a tapered surface whose diameter increases in the drawing direction and an inner lip provided on the die side of the outer lip,
An air suction hole is formed between the inner lip and the die, and the air ring is provided in close contact with the die, so that a depressurized area is formed between the inner lip of the air ring and the die. The invention resides in an inflation film forming apparatus characterized by the following.
本発明装置に適用し得る熱可塑性合成樹脂とし
てはポリエチレン、ポリプロピレン、エチレン−
プロピレン共重合体、ポリブテン１、エチレン−
酢酸ビニル共重合体等のオレフイン系樹脂、ポリ
スチレン、アクリロニトリル−スチレン共重合
体、アクリロニトリル−ブタジエン−スチレン三
元共重合体等のスチレン系樹脂、ナイロン６、ナ
イロン６−６、ナイロン６−10、ナイロン11、ナ
イロン12等のアミド系樹脂、ポリ塩化ビニル、ポ
リ塩化ビニリデン、塩化ビニル−酢酸ビニル共重
合体等の塩化ビニル系樹脂、ポリエチレンテレフ
タレート、ポリブチレンテレフタレート等のエス
テル系樹脂等、通常インフレーシヨン成形に用い
られる熱可塑性合成樹脂が適用し得るが、中でも
ポリオレフイン系樹脂が好適であり、更に好まし
くは高密度ポリエチレン、線状低密度ポリエチレ
ン等の溶融張力の低いポリエチレンが良く、特に
線状低密度ポリエチレンが最適である。 Thermoplastic synthetic resins applicable to the device of the present invention include polyethylene, polypropylene, ethylene-
Propylene copolymer, polybutene 1, ethylene-
Olefin resins such as vinyl acetate copolymer, polystyrene, styrene resins such as acrylonitrile-styrene copolymer, acrylonitrile-butadiene-styrene terpolymer, nylon 6, nylon 6-6, nylon 6-10, nylon 11, amide resins such as nylon 12, vinyl chloride resins such as polyvinyl chloride, polyvinylidene chloride, vinyl chloride-vinyl acetate copolymer, ester resins such as polyethylene terephthalate, polybutylene terephthalate, etc., usually inflation Thermoplastic synthetic resins used for molding can be applied, but polyolefin resins are preferred, and polyethylenes with low melt tension such as high-density polyethylene and linear low-density polyethylene are more preferred, especially linear low-density polyethylenes. Polyethylene is best.
線状低密度ポリエチレンとは、エチレンと他の
α−オレフインとの共重合物であり、従来の高圧
法により製造された低密度ポリエチレン樹脂とは
異なる。線状低密度ポリエチレンは、例えばエチ
レンと、他のα−オレフインとしてブテン、ヘキ
セン、オクテン、デセン等との共重合体であり中
低圧法高密度ポリエチレン製造に用いられるチー
グラー型触媒又はフイリツプス型触媒を用いて製
造されるものであり、従来の高密度ポリエチレン
を共重合成分により短い枝分かれ構造とし、密度
もこの短鎖枝分かれを利用して適当に低下させ
0.91〜0.95ｇ／cm3程度としたものであり、従来の
低密度ポリエチレンより直鎖性があり、高密度ポ
リエチレンより枝分かれが多い構造のポリエチレ
ンである。 Linear low-density polyethylene is a copolymer of ethylene and other α-olefins, and is different from low-density polyethylene resins produced by conventional high-pressure methods. Linear low-density polyethylene is, for example, a copolymer of ethylene and other α-olefins such as butene, hexene, octene, decene, etc., and is prepared using a Ziegler-type catalyst or a Phillips-type catalyst used in the production of high-density polyethylene by a medium-low pressure process. It is manufactured by using conventional high-density polyethylene with a short branched structure using a copolymer component, and the density is also appropriately reduced using this short chain branching.
It is about 0.91 to 0.95 g/cm 3 , and is polyethylene with a structure that is more linear than conventional low-density polyethylene and more branched than high-density polyethylene.
以下本発明の装置の一例につき図面を用いて更
に詳細に説明する。 An example of the apparatus of the present invention will be explained in more detail below with reference to the drawings.
第１図は本発明の装置の一例を示す縦断面図、
第２図は第１図に示した装置の一部を拡大して示
す縦断面図、第３図、第４図は本発明の装置の他
の一例を示す縦断面図である。 FIG. 1 is a longitudinal sectional view showing an example of the device of the present invention;
FIG. 2 is an enlarged vertical cross-sectional view of a part of the apparatus shown in FIG. 1, and FIGS. 3 and 4 are vertical cross-sectional views showing other examples of the apparatus of the present invention.
図中１はエアーリング、２はダイ、３は外側リ
ツプ、４は内側リツプ、５は空気吹出口、６は空
気吸引孔、７は減圧発生カバー、８は空気導入
口、９は整流板、１０は筒状フイルム、１１はス
ペーサーをそれぞれ示す。 In the figure, 1 is an air ring, 2 is a die, 3 is an outer lip, 4 is an inner lip, 5 is an air outlet, 6 is an air suction hole, 7 is a reduced pressure generation cover, 8 is an air inlet, 9 is a rectifier plate, 10 represents a cylindrical film, and 11 represents a spacer.
第１図に示すようにエアーリング１は円形スリ
ツトを有するダイの上部に円形スリツトを囲繞す
るように設けられている。 As shown in FIG. 1, an air ring 1 is provided above a die having a circular slit so as to surround the circular slit.
エアーリング１には外側リツプ３と内側リツプ
４が設けられており、外側リツプ３の内面はダイ
２の円形スリツトから押出された筒状フイルム１
０の引取方向に向つて拡径されたテーパー面とさ
れており、内側リツプ４はこの外側リツプの下方
であつてダイ側に設けられている。内側リツプ４
の内面は外側リツプ３と同様に筒状フイルムの引
取方向に向つて拡径されているのが良いが拡径さ
れていなくとも使用できる。 The air ring 1 is provided with an outer lip 3 and an inner lip 4, and the inner surface of the outer lip 3 is covered with the cylindrical film 1 extruded from the circular slit of the die 2.
The inner lip 4 is provided below the outer lip and on the die side. inner lip 4
It is preferable that the inner surface of the lip 3 has an enlarged diameter in the direction in which the cylindrical film is taken, similar to the outer lip 3, but it can also be used even if the diameter is not enlarged.
外側リツプ３と内側リツプ４との間には間隙が
形成されており、この間隙が空気吹出口５とされ
る。空気吹出口５は、該吹出口５から吹出された
空気が、外側リツプ３のテーパー面と筒状フイル
ムの間をスムーズに流れるように筒状フイルム１
０の引取方向に向いて開孔されているのが良い。 A gap is formed between the outer lip 3 and the inner lip 4, and this gap serves as an air outlet 5. The air outlet 5 is connected to the cylindrical film 1 so that the air blown out from the air outlet 5 flows smoothly between the tapered surface of the outer lip 3 and the cylindrical film.
It is preferable that the hole be opened facing the direction of take-up.
内側リツプ４とダイ２との間には空気吸引孔６
が形成されており、この空気吸引孔から空気を吸
い込むことにより筒状フイルム１０とエアーリン
グ１との間に減圧域を形成する。このためエアー
リング１とダイ２との間には減圧を阻害するよう
な大きな隙間が形成されないように、通常は密着
されて設けられている。エアーリング１の位置を
調節したい場合にはエアーリング１とダイとの間
に設けるスペーサー１１の厚さを変えれば良い。 There is an air suction hole 6 between the inner lip 4 and the die 2.
is formed, and by sucking air through this air suction hole, a reduced pressure area is formed between the cylindrical film 10 and the air ring 1. For this reason, the air ring 1 and the die 2 are usually provided in close contact with each other so that a large gap that would impede pressure reduction is not formed between the air ring 1 and the die 2. If it is desired to adjust the position of the air ring 1, the thickness of the spacer 11 provided between the air ring 1 and the die may be changed.
上記したテーパー面及び減圧域による作用を空
気の流れに従い説明する。 The effects of the above-mentioned tapered surface and reduced pressure area will be explained according to the flow of air.
空気導入口８から導入された空気は邪魔板によ
り整流され空気吹出口に向つて送られる。送られ
た空気は第２図に示すように空気流路に開口した
空気吸引孔６の上方を通過する。この空気吸引孔
６が空気流路に開孔した部分には、該開孔が被さ
るように減圧発生カバー７が設けられており、空
気流路を流れる空気及び減圧発生カバー７による
ベンチユリー効果によりこの空気吸引孔６内が減
圧状態となり、筒状フイルム１０と内側リツプ４
との間に減圧域が発生する。空気流路を流れる空
気は更に進み、空気吹出口から吹出され筒状フイ
ルム１０と外側リツプ３のテーパー面との間を通
り、外方に逃げる。 Air introduced from the air inlet 8 is rectified by the baffle plate and sent toward the air outlet. The sent air passes above the air suction hole 6 which opens into the air flow path as shown in FIG. A reduced pressure generating cover 7 is provided at the part where the air suction hole 6 opens in the air flow path so as to cover the hole, and the air flowing through the air flow path and the ventilary effect of the reduced pressure generating cover 7 cause this air to flow. The pressure inside the air suction hole 6 is reduced, and the cylindrical film 10 and inner lip 4
A reduced pressure area occurs between the two. The air flowing through the air flow path further advances, is blown out from the air outlet, passes between the cylindrical film 10 and the tapered surface of the outer lip 3, and escapes to the outside.
この空気の流れに伴う筒状フイルム１０の状態
を説明すれば、ダイ２から押出された筒状フイル
ム１０は減圧域で外方に吸引されるため予備的に
ある程度その径が拡径され上方に送られる。上方
に送られた筒状フイルム１０は空気吹出口５から
吹出される空気により冷却されながら外側リツプ
３のテーパー面に沿つて拡径されつつ、最終的に
筒状フイルムの内部に封入された空気等の気体の
圧力により所望の径まで拡径される。 To explain the state of the cylindrical film 10 caused by this air flow, the cylindrical film 10 extruded from the die 2 is sucked outward in the reduced pressure area, so its diameter is preliminarily expanded to some extent and it is pushed upward. Sent. The cylindrical film 10 sent upward is cooled by the air blown out from the air outlet 5 and expanded in diameter along the tapered surface of the outer lip 3, and finally the air sealed inside the cylindrical film is expanded. The diameter is expanded to the desired diameter by the pressure of the gas.
すなわち、筒状フイルム１０はダイから押出さ
れた直後に減圧域である程度拡径され、また外側
リツプ３のテーパー面に沿つて更に拡径される。
このテーパー面に沿つての拡径はテーパー面と筒
状フイルム１０との間が狭いため空気流の働きに
よりこの間がベンチユリー効果により若干減圧状
態となり、筒状フイルム１０がテーパー面に引き
付けられて拡径するものと考えられる。 That is, immediately after being extruded from the die, the cylindrical film 10 is expanded in diameter to some extent in the reduced pressure region, and further expanded in diameter along the tapered surface of the outer lip 3.
Due to the narrow space between the tapered surface and the cylindrical film 10, the diameter of the cylindrical film 10 expands along the tapered surface. It is thought that the diameter will increase.
更に、上記したような減圧域による拡径は、あ
まりに強い減圧度としてしまうと筒状フイルム１
０が内側リツプ等に接触してしまうことが考えら
れるが減圧発生カバー７と空気吸引孔６との間隔
を調節することで減圧度は調節し得る。減圧域の
減圧度は、樹脂の種類、所望ブローアツプ比等に
より異なるが、通常0.5〜20mm水柱、好ましくは
１〜15mm水柱の減圧度とされるのが望ましい。減
圧度及び空気吹出口５からの空気吹出量等を調節
することにより、空気吹出口５から内側リツプ４
と筒状フイルム１０との間を通り空気吸引孔６に
至る下向きの空気流が生じ、この空気流が防御膜
となり、筒状フイルム１０が内側リツプ４と接触
するのが防止できる。外側リツプ３と筒状フイル
ム１０との間の空気流にも同様の働きがあるのは
勿論である。 Furthermore, if the diameter expansion due to the reduced pressure region as described above is made too strong, the cylindrical film 1
Although it is conceivable that the 0 may come into contact with the inner lip or the like, the degree of reduced pressure can be adjusted by adjusting the distance between the reduced pressure generating cover 7 and the air suction hole 6. The degree of vacuum in the vacuum region varies depending on the type of resin, desired blow-up ratio, etc., but it is usually 0.5 to 20 mm of water column, preferably 1 to 15 mm of water column. By adjusting the degree of pressure reduction and the amount of air blown from the air outlet 5, the inner lip 4 can be removed from the air outlet 5.
A downward air flow is generated passing between the cylindrical film 10 and the air suction hole 6, and this air flow acts as a protective film to prevent the cylindrical film 10 from coming into contact with the inner lip 4. Of course, the air flow between the outer lip 3 and the cylindrical film 10 has a similar function.
第３図に示したものは本発明装置の他の一例で
あり、第１図に示したような減圧発生カバーを設
けず、外側リツプ３の下側、すなわち空気吸引孔
６が空気流路に開孔する部分の上側部分に突起を
設けることにより該突起を設けた部分の空気流路
を狭くすることによりこの部分の空気流の流速を
他の部分より速くなし（すなわち、この部分をベ
ンチユリー管で云うところのスロートとし）この
スロート部で生ずる減圧効果により空気吸引孔６
から空気を吸引し、これにより内側リツプとダイ
との間に減圧域を形成するようになしたものであ
る。 The one shown in FIG. 3 is another example of the device of the present invention, in which the reduced pressure generating cover as shown in FIG. By providing a protrusion on the upper part of the part where the hole is to be opened, the air flow path in the part where the protrusion is provided is narrowed, so that the airflow velocity in this part is faster than in other parts (i.e., this part is The air suction hole 6 is
Air is sucked in from the die to form a reduced pressure area between the inner lip and the die.
ただ単に、空気流路に開孔を設けると空気流が
分岐して上記の説明とは逆に空気が吹出すことと
なるが、上述のように空気流路を特定の構造（ベ
ンチユリー管構造）とし、スロート部とその前後
の空気流路の広さを適宜設定することにより減圧
部が形成され、空気吸引孔６及びその先の内側リ
ツプ４とダイとの間の部分が減圧状態となる。 Simply providing an opening in the air flow path will cause the air flow to branch and air will blow out, contrary to the above explanation, but as mentioned above, the air flow path can be formed into a specific structure (ventilary tube structure). By appropriately setting the width of the throat portion and the air passages before and after the throat portion, a pressure reducing portion is formed, and the air suction hole 6 and the portion beyond the inner lip 4 between the die and the air suction hole 6 are in a reduced pressure state.
また、外側リツプ３の上方に整流板９を設け空
気吹出口５から吹出された空気を筒状フイルム１
０に沿つて更に良好に流れるようにしてある。 Further, a rectifying plate 9 is provided above the outer lip 3 to direct the air blown from the air outlet 5 to the cylindrical film 1.
It is designed to flow even better along the zero axis.
第４図に示したものも本発明装置の他の一例
で、減圧発生カバー７の向きを第１図に示したも
のとは違う向き（縦向き）として減圧効果の発生
域を空気吹出口５の近傍に形成したものであり、
この場合にも第１図で説明したのと同様に空気吸
引孔６は空気流路中の空気流のベンチユリー効果
により減圧状態となる。 The one shown in FIG. 4 is another example of the device of the present invention, in which the direction of the reduced pressure generating cover 7 is different from that shown in FIG. It is formed near the
In this case as well, the air suction hole 6 is brought into a reduced pressure state due to the Ventury effect of the air flow in the air flow path, as described with reference to FIG.
なお、第１図、第３図、第４図に示すように外
側リツプ３はエアーリング１に螺合等の手段によ
り取付け、上下動可能としておくことにより空気
吹出口５からの吹出量や、空気吸引孔６の減圧度
等を調節し得るようになされているのが望まし
い。 As shown in FIGS. 1, 3, and 4, the outer lip 3 is attached to the air ring 1 by screwing or other means, and is movable up and down, thereby controlling the amount of air blown from the air outlet 5. It is desirable that the degree of pressure reduction in the air suction hole 6 can be adjusted.
更に、空気吸引孔６は第１図〜第４図に示した
ように空気流路に開孔させてベンチユリー効果に
より減圧するのが機構的に簡便であり好ましい
が、例えば空気吸引孔６に外部に設けた吸引装置
（図示せず）等を接続し、これにより減圧として
も良い。 Furthermore, it is preferable that the air suction hole 6 is opened in the air flow path as shown in FIGS. 1 to 4 to reduce the pressure by the Ventury effect. However, for example, if the air suction hole 6 is The pressure may be reduced by connecting a suction device (not shown) or the like provided in the chamber.
このように、本発明の装置によれば、筒状フイ
ルム１０が、減圧域による減圧、テーパー面と筒
状フイルムの間に生ずるベンチユリー効果等によ
り段階的に拡径されていくものであるから高いブ
ローアツプ比にすることが可能であり、また、筒
状フイルムが減圧域、テーパー面の減圧効果等に
より外方に吸引された状態となり、かつ、その間
には空気流が連続的に流れているものであるから
筒状フイルムが極めて安定して成形し得る効果を
奏する。これにより高速成形が可能となり、実用
上大変優れた装置である。 As described above, according to the apparatus of the present invention, the diameter of the cylindrical film 10 is expanded stepwise due to the reduced pressure in the reduced pressure region, the ventilly effect generated between the tapered surface and the cylindrical film, and so on. It is possible to achieve a blow-up ratio, and the cylindrical film is in a state of being sucked outward due to the reduced pressure area, the reduced pressure effect of the tapered surface, etc., and there is a continuous air flow between them. Therefore, the cylindrical film can be formed extremely stably. This allows high-speed molding, making it an extremely excellent device in practical terms.
第１図は本発明装置の一例を示す縦断面図、第
２図は第１図に示した装置の一部を拡大して示す
縦断面図、第３図および第４図は本発明装置の他
の一例を示す縦断面図である。
図中１はエアーリング、２はダイ、３は外側リ
ツプ、４は内側リツプ、５は空気吹出口、６は空
気吸引孔、７は減圧発生カバー、８は空気導入
口、９は整流板、１０は筒状フイルム、１１はス
ペーサーをそれぞれ示す。
FIG. 1 is a longitudinal sectional view showing an example of the device of the present invention, FIG. 2 is a longitudinal sectional view showing an enlarged part of the device shown in FIG. 1, and FIGS. 3 and 4 are views of the device of the invention. It is a longitudinal cross-sectional view which shows another example. In the figure, 1 is an air ring, 2 is a die, 3 is an outer lip, 4 is an inner lip, 5 is an air outlet, 6 is an air suction hole, 7 is a reduced pressure generation cover, 8 is an air inlet, 9 is a rectifier plate, 10 represents a cylindrical film, and 11 represents a spacer.
Claims (1)
用ダイと、該ダイの円形スリツトを囲繞するよう
に設けられたエアーリングとからなり、該エアー
リングの空気吹出口を、円形スリツトから押出さ
れた筒状フイルムの引取方向に向つて拡径された
テーパー面を有する外側リツプと該外側リツプよ
りダイ側に設けられた内側リツプとの間に形成
し、該内側リツプとダイとの間には空気吸引孔を
形成し、かつエアーリングをダイに密着させて設
けることにより、エアーリングの内側リツプとダ
イとの間に減圧域を形成する構造としたことを特
徴とするインフレーシヨンフイルム成形装置。 ２ 空気吸引孔はエアーリングの空気流路に開孔
しており、ベンチユリー効果により、減圧状態と
され、内側リツプとダイとの間の空気を吸引する
ようにしたことを特徴とする特許請求の範囲第１
項に記載の装置。[Claims] 1. Consisting of an inflation molding die having a circular slit, and an air ring provided to surround the circular slit of the die, the air outlet of the air ring is connected from the circular slit. It is formed between an outer lip having a tapered surface whose diameter increases in the direction in which the extruded cylindrical film is taken, and an inner lip provided on the die side of the outer lip, and between the inner lip and the die. An blown film characterized by having a structure in which an air suction hole is formed in the inner lip of the air ring, and an air ring is provided in close contact with the die to form a depressurized area between the inner lip of the air ring and the die. Molding equipment. 2. The air suction hole is opened in the air flow path of the air ring, and is brought into a reduced pressure state due to the ventilate effect, and the air between the inner lip and the die is sucked. Range 1
The equipment described in section.
Priority Applications (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56174350A JPS5874322A (en) | 1981-10-30 | 1981-10-30 | Inflation film molding device |
| KR8204843A KR880001768B1 (en) | 1981-10-30 | 1982-10-28 | Apparatus for forming blown films |
| FR8218189A FR2515571B1 (en) | 1981-10-30 | 1982-10-29 | APPARATUS FOR FORMING BLOWN FILMS |
| GB08231002A GB2110159B (en) | 1981-10-30 | 1982-10-29 | Cooling blown films |
| DE19823240212 DE3240212A1 (en) | 1981-10-30 | 1982-10-29 | DEVICE FOR PRODUCING TUBE FILMS |
| US06/624,791 US4505657A (en) | 1981-10-30 | 1984-06-26 | Apparatus for forming blown films |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP56174350A JPS5874322A (en) | 1981-10-30 | 1981-10-30 | Inflation film molding device |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5874322A JPS5874322A (en) | 1983-05-04 |
| JPH0116655B2 true JPH0116655B2 (en) | 1989-03-27 |
Family
ID=15977100
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP56174350A Granted JPS5874322A (en) | 1981-10-30 | 1981-10-30 | Inflation film molding device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5874322A (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6015121A (en) * | 1983-07-08 | 1985-01-25 | Idemitsu Petrochem Co Ltd | Method of forming blown film |
| CN112959571A (en) * | 2021-02-04 | 2021-06-15 | 深圳弘臻新材料科技有限公司 | Temperature control air disc for primary forming in PVC heat-shrinkable tube production process |
| CN114789570B (en) * | 2022-03-24 | 2024-05-17 | 广州市普同实验分析仪器有限公司 | Film rigid blowing device and method thereof |
-
1981
- 1981-10-30 JP JP56174350A patent/JPS5874322A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5874322A (en) | 1983-05-04 |
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