JPH03183525A - Molding method and molds used for the method - Google Patents
Molding method and molds used for the methodInfo
- Publication number
- JPH03183525A JPH03183525A JP1323316A JP32331689A JPH03183525A JP H03183525 A JPH03183525 A JP H03183525A JP 1323316 A JP1323316 A JP 1323316A JP 32331689 A JP32331689 A JP 32331689A JP H03183525 A JPH03183525 A JP H03183525A
- Authority
- JP
- Japan
- Prior art keywords
- sheets
- mold
- extruder
- extruded
- sheet
- 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
- 238000000465 moulding Methods 0.000 title claims abstract description 24
- 238000000034 method Methods 0.000 title claims abstract description 20
- 229920005992 thermoplastic resin Polymers 0.000 claims abstract description 5
- 238000007664 blowing Methods 0.000 claims description 6
- 238000001125 extrusion Methods 0.000 abstract description 3
- 238000000071 blow moulding Methods 0.000 description 4
- 238000005520 cutting process Methods 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
- 238000010438 heat treatment Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004793 Polystyrene Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920005672 polyolefin resin 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
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 238000005096 rolling process Methods 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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/0063—Cutting longitudinally
-
- 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
- B29C2793/00—Shaping techniques involving a cutting or machining operation
- B29C2793/0081—Shaping techniques involving a cutting or machining operation before shaping
-
- 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
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
-
- 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
Landscapes
- Moulds For Moulding Plastics Or The Like (AREA)
- Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
Abstract
Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明は成形方法及びその方法に用いる金型に関する。[Detailed description of the invention] [Industrial application field] The present invention relates to a molding method and a mold used in the method.
（従来の技術及び
発明が解決しようどする課題〕
押出機内で熱可塑性樹脂を加熱溶融し、この溶融した樹
脂を、押出機先端の環状ダイスより押出して得られるチ
ューブ状のパリソンを成形する方法として、押出機から
押し出されたパリソンが冷却しない内にパリソンをその
まま成形するブロー成形や、パリソンを切り開いて一旦
シートとして巻き取っておき、このシートを成形工程に
おいて再び加熱軟化させて成形するシート成形等が知ら
れている。(Problems to be Solved by the Prior Art and the Invention) A method for forming a tube-shaped parison by heating and melting a thermoplastic resin in an extruder and extruding the molten resin from an annular die at the tip of the extruder. Blow molding, in which the parison extruded from an extruder is molded as it is before it cools, and sheet molding, in which the parison is cut open and wound up as a sheet, and then heated and softened again in the molding process. It is being
上記ブロー成形は押出機先端の環状ダイスから押出して
形成したパリソンが冷却しないうちに成形するため、熱
エネルギーの利用効率には優れているが、ブロー成形は
瓶のような中空容器を成形する場合にしか用いられてお
らず、しかも−回の成形で一つの成形体しか得られない
ため、成形効率が悪いという問題もある。一方、パリソ
ンをシート状に展開して巻き取っておき、このシート再
度加熱軟化させて成形する方法では、上記ブロー成形法
に比べて熱エネルギーの利用効率に劣るという問題があ
るとともに、所定の幅のシートにして巻き取る必要があ
るため、シートのサイドをカットする余分な工程が必要
となるという問題がある。Blow molding is superior in the efficiency of thermal energy use because the parison extruded from the annular die at the tip of the extruder is molded before it cools down. However, blow molding is used to mold hollow containers such as bottles. There is also the problem that the molding efficiency is poor because it is only used in the following cases and only one molded body can be obtained in one molding cycle. On the other hand, the method in which the parison is rolled out into a sheet, rolled up, heated and softened again, and then molded has the problem that it is inferior to the blow molding method in terms of thermal energy usage efficiency, and also Since the sheet needs to be rolled up and rolled up, there is a problem in that an extra step of cutting the sides of the sheet is required.
本発明は上記の点に鑑みなされたもので、熱エネルギー
の利用効率、成形効率に優れた成形方法及びその方法に
用いる金型を提供することを目的とする。The present invention was made in view of the above points, and an object of the present invention is to provide a molding method with excellent heat energy utilization efficiency and molding efficiency, and a mold used in the method.
即ち本発明は、
（１）溶融した熱可塑性樹脂を押出機先端の環状ダイス
から押出してパリソンを切り開いた状態のい２枚のシー
トを形威し、次いで該シートが軟化状態にある間に、左
右の側型内に圧搾空気を吹き込む空気孔を有する中間型
と、該中間型を挾む左右の側型とからなる成形型の中間
型と左右の側型との間に上記２枚のシートを各々同時に
挟み込み、しかるのち中間型の空気孔から圧搾空気を吹
き込んで各シートを同時に圧空成形することを特徴とす
る成型方法。That is, the present invention has the following features: (1) Extruding a molten thermoplastic resin from an annular die at the tip of an extruder to form two sheets with parisons cut out, and then, while the sheets are in a softened state, The above two sheets are placed between the intermediate mold and the left and right side molds of a mold consisting of an intermediate mold having air holes for blowing compressed air into the left and right side molds, and left and right side molds that sandwich the intermediate mold. A molding method characterized by simultaneously sandwiching each sheet, and then blowing compressed air from an air hole in an intermediate mold to air-form each sheet at the same time.
（２） 請求項１記載の方法において用いる金型。(2) A mold used in the method according to claim 1.
を要旨とするものである。The main points are as follows.
以下、本発明の一実施例を図面に基き説明する。 Hereinafter, one embodiment of the present invention will be described based on the drawings.
第１図に示すように本発明の金型は、中間型１と、該中
間型１の左右に設けられた側型２．３とからなり、側型
２．３は中間型１に対して接近又は離反する方向（矢印
方向）に移動可能に構成されており、且つ側型２．３に
は所望の形状に形威された成形凹部２ａ、３ａが設けら
れている。中間型１には圧搾空気供給口４から供給され
る圧搾空気を左右の側型の成形凹部２ａ、３ａ内に向け
て吹き込むための空気孔５が複数設けられている。As shown in FIG. 1, the mold of the present invention consists of an intermediate mold 1 and side molds 2.3 provided on the left and right sides of the intermediate mold 1. The side mold 2.3 is configured to be movable in the direction of approaching or moving away (arrow direction), and the side mold 2.3 is provided with molding recesses 2a, 3a shaped into a desired shape. The intermediate mold 1 is provided with a plurality of air holes 5 for blowing compressed air supplied from the compressed air supply port 4 into the molding recesses 2a, 3a of the left and right side molds.
本発明の成形方法は、まず押出機６内にて溶融された熱
可塑性合成樹脂を押出機先端の環状ダイスより下方に押
出し、パリソンを切り開いた状態の２枚のシー）８ａ、
８ｂを形成する。上記熱可塑性合成樹脂としては、通常
のシート成形に用いられる熱可塑性合成樹脂を用いるこ
とができ、例えばポリエチレン、ポリプロピレン、エチ
レン−プロピレン共重合体、エチレン−酢酸ビニル共重
合体等のオレフィン系樹脂、ポリスチレン、ポリ塩化ビ
ニル等が挙げられる。In the molding method of the present invention, first, a thermoplastic synthetic resin melted in an extruder 6 is extruded downward from an annular die at the tip of the extruder, and a parison is cut into two sheets (8a),
Form 8b. As the thermoplastic synthetic resin, thermoplastic synthetic resins commonly used for sheet molding can be used, such as olefin resins such as polyethylene, polypropylene, ethylene-propylene copolymer, ethylene-vinyl acetate copolymer, etc. Examples include polystyrene and polyvinyl chloride.
シー）８ａ、８ｂは環状ダイス７外側の出口付近にカッ
ターを設けておき、このカッターによって環状ダイス７
より押出されたチューブ状のパリソン８を切り開いて得
ることもできるが、第２図に示すように環状ダイス７の
スリット９にアル≧ニウム板等からなる仕切り板１０を
設けておき、パリソンを切り開いた状態の２枚のシート
として押出されるようにしても良い。C) 8a and 8b are provided with a cutter near the outer exit of the annular die 7, and this cutter cuts the annular die 7.
It is also possible to obtain the extruded tube-shaped parison 8 by cutting it open, but as shown in FIG. It may also be extruded as two sheets in a state of being separated.
所定の長さのシー）８ａ、８ｂが押出されると一旦押出
機６からの押出しを停止し、シート８ａ、８ｂが軟化状
態にある間に第３図に示すように、シート８ａ、８ｂを
左右の側型２．３と中間型１との間に位置せしめ、左右
の側型２．３と中間型１とによって各々シート８ａ、８
ｂを挟んだ後、中間型１の空気孔５から圧搾空気を吹き
込むことにより成形凹部２ ａ ｓ ２ ｂに応じた形
状にシート８ａ、８ｂを圧空成形する。次いで冷却して
成形体を得る。このようにして−回の成形作業で同時に
２つの成形品を得ることができる。Once the sheets 8a, 8b of a predetermined length have been extruded, extrusion from the extruder 6 is temporarily stopped, and while the sheets 8a, 8b are in a softened state, the sheets 8a, 8b are extruded as shown in FIG. The sheets 8a and 8 are positioned between the left and right side molds 2.3 and the intermediate mold 1, and the sheets 8a and 8 are formed by the left and right side molds 2.3 and the intermediate mold 1, respectively.
After sandwiching the sheets 8a and 8b, compressed air is blown through the air hole 5 of the intermediate mold 1 to air-form the sheets 8a and 8b into a shape corresponding to the molding recesses 2a s 2b. Then, it is cooled to obtain a molded body. In this way, two molded products can be obtained at the same time in one molding operation.
尚、１つの成形体の大きさがそれほど大きくない場合に
は側型２．３として２つ取り用、３つ取り用等の複数取
り用に形威されたものを用いてもよく、この場合、−回
の成形で４つ或いは６つ等の成形品を同時に得ることが
できる。In addition, if the size of one molded body is not so large, a side mold 2.3 shaped for multiple molds such as two molds or three molds may be used; in this case, , - four or six molded products can be obtained at the same time.
以上説明したように本発明の金型は、中間型を挟む左右
の側型を設け、中間型から左右の側型内に向けて圧搾空
気を吹き込み得るようにした構成を有し、また本発明成
形方法は溶融した熱可塑性樹脂を押出機先端の環状ダイ
スから押出してパリソンを切り開いた状態の２枚のシー
トを形威し、このシートが軟化状態にある間に各シート
を上記金型の中間型と左右の側型とによってそれぞれ挾
み込み、しかる後、中間型から圧搾空気を吹き込んで各
シートを圧空成形する方法を採用したから、−回の成形
作業によって同時に左右２つの成形を行うことができる
ため成形効率が良いとともに、押出機からの押出しと成
形とを連続して行い、しかもパリソンを切り開いたシー
トが軟化状態にある間に成形する方法を採用したから、
パリソンを切り開いたシートを一旦巻き取っておき、こ
のシートを再度加熱軟化して成形する方法に比べて熱エ
ネルギーの利用効率に優れるとともに、所定幅のシート
とするためのサイドカット工程も不要となり効率良く成
形を行うことができる。As explained above, the mold of the present invention has a configuration in which left and right side molds sandwiching the intermediate mold are provided, and compressed air can be blown from the intermediate mold into the left and right side molds. The molding method involves extruding molten thermoplastic resin through an annular die at the tip of an extruder to form two sheets with parisons cut open, and while these sheets are in a softened state, each sheet is inserted into the middle of the mold. Since we adopted a method in which each sheet is compressed by sandwiching it between the mold and the left and right side molds, and then blowing compressed air from the intermediate mold, it is possible to mold the left and right sheets at the same time in - times of molding. In addition to being highly efficient in forming, we adopted a method in which extrusion from an extruder and forming are performed continuously, and the forming is performed while the parison sheet is still in a softened state.
Compared to the method of rolling up a sheet cut out of a parison and then heating and softening the sheet again to form it, this method is more efficient in using thermal energy, and also eliminates the need for a side-cutting process to form a sheet of a predetermined width, resulting in more efficient forming. It can be performed.
図面は本発明の一実施例を示し、第１図、第３図は本発
明の成形の一工程を示す縦断面図、第２図は環状ダイス
の正面図である。
１・・・中間型 ２．３・・・側型 ５・・・空気孔６
・・・押出機 ７・・・環状ダイス ８・・・パリソン
８ａ、８ｂ・・・シート
ド・・中間型
２．３・・・側型
５・・・空気孔
６・・・押出機
７・・環状ダイス
８１．バリノン
８ａ ！ ８ｂ・・・／−ト
第
図The drawings show an embodiment of the present invention, and FIGS. 1 and 3 are longitudinal cross-sectional views showing one step of molding according to the present invention, and FIG. 2 is a front view of an annular die. 1...Middle mold 2.3...Side mold 5...Air hole 6
... Extruder 7 ... Annular die 8 ... Parison 8a, 8b ... Sheeted ... Intermediate mold 2.3 ... Side mold 5 ... Air hole 6 ... Extruder 7 ... Annular die 81. Balinon 8a! 8b.../-T diagram
Claims (2)
から押出してパリソンを切り開いた状態の２枚のシート
を形成し、次いで該シートが軟化状態にある間に、左右
の側型内に圧搾空気を吹き込む空気孔を有する中間型と
、該中間型を挟む左右の側型とからなる成形型の中間型
と左右の側型との間に上記２枚のシートを各々同時に挟
み込み、しかるのち中間型の空気孔から圧搾空気を吹き
込んで各シートを同時に圧空成形することを特徴とする
成型方法。(1) Molten thermoplastic resin is extruded from an annular die at the tip of the extruder to form two sheets with parisons cut open, and then, while the sheets are in a softened state, they are compressed into left and right side molds. The above two sheets are simultaneously sandwiched between the intermediate mold and the left and right side molds of a mold consisting of an intermediate mold having an air hole for blowing air, and left and right side molds that sandwich the intermediate mold. A molding method characterized by blowing compressed air through the air holes of the mold to pressure-form each sheet at the same time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1323316A JPH03183525A (en) | 1989-12-13 | 1989-12-13 | Molding method and molds used for the method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1323316A JPH03183525A (en) | 1989-12-13 | 1989-12-13 | Molding method and molds used for the method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03183525A true JPH03183525A (en) | 1991-08-09 |
Family
ID=18153430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1323316A Pending JPH03183525A (en) | 1989-12-13 | 1989-12-13 | Molding method and molds used for the method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03183525A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002120294A (en) * | 2000-08-28 | 2002-04-23 | Basell Polyolefine Gmbh | Hollow plastic products |
| JP2013111959A (en) * | 2011-12-01 | 2013-06-10 | Yachiyo Industry Co Ltd | Device and method for producing blow-molded article |
-
1989
- 1989-12-13 JP JP1323316A patent/JPH03183525A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002120294A (en) * | 2000-08-28 | 2002-04-23 | Basell Polyolefine Gmbh | Hollow plastic products |
| JP2013111959A (en) * | 2011-12-01 | 2013-06-10 | Yachiyo Industry Co Ltd | Device and method for producing blow-molded article |
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