JPH01176543A - Extrusion molding of synthetic resin - Google Patents
Extrusion molding of synthetic resinInfo
- Publication number
- JPH01176543A JPH01176543A JP33685287A JP33685287A JPH01176543A JP H01176543 A JPH01176543 A JP H01176543A JP 33685287 A JP33685287 A JP 33685287A JP 33685287 A JP33685287 A JP 33685287A JP H01176543 A JPH01176543 A JP H01176543A
- Authority
- JP
- Japan
- Prior art keywords
- synthetic resin
- stretching
- temp
- resin material
- water
- 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.)
- Granted
Links
- 229920003002 synthetic resin Polymers 0.000 title claims abstract description 47
- 239000000057 synthetic resin Substances 0.000 title claims abstract description 47
- 238000001125 extrusion Methods 0.000 title claims description 14
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 35
- 238000000034 method Methods 0.000 claims abstract description 28
- 239000000463 material Substances 0.000 claims abstract description 25
- 229920003023 plastic Polymers 0.000 claims abstract description 9
- 239000004033 plastic Substances 0.000 claims abstract description 9
- 238000001816 cooling Methods 0.000 abstract description 4
- 238000002360 preparation method Methods 0.000 abstract 1
- 229920013716 polyethylene resin Polymers 0.000 description 21
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000005192 partition Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 238000009826 distribution Methods 0.000 description 2
- 238000004513 sizing Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 239000004416 thermosoftening plastic Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000003000 extruded plastic Substances 0.000 description 1
- 238000000465 moulding Methods 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
- 238000000926 separation method Methods 0.000 description 1
Landscapes
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Yarns And Mechanical Finishing Of Yarns Or Ropes (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、可塑状態の合成樹脂材料を延伸させて所望の
成形品を得る合成樹脂押出成形方法に関する。DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a synthetic resin extrusion molding method for obtaining a desired molded article by stretching a plasticized synthetic resin material.
盛土等の法面崩壊防止工法や軟弱地盤の不当沈下防止工
法や暗渠基礎補強工法等の土木工事に用いられる合成樹
脂ネットには優れた引張強度等の機械的強度が要求され
る。そこで、このような合成樹脂ネットの製造工程中に
は可塑状態で押し出された合成樹脂材料を延伸する工程
（延伸工程）が含まれ、その延伸工程を行うことによっ
て成形品である合成樹脂ネットに優れた引張強度等を付
与している。Synthetic resin nets used in civil engineering works, such as methods to prevent slope collapse such as embankments, methods to prevent undue settlement of soft ground, and methods to reinforce culvert foundations, are required to have excellent mechanical strength such as tensile strength. Therefore, the manufacturing process of such synthetic resin nets includes a step (stretching step) of stretching the extruded synthetic resin material in a plastic state, and by performing the stretching step, the synthetic resin net, which is a molded product, is Provides excellent tensile strength, etc.
従来、ポリエチレン樹脂よりなる合成樹脂ネットの製造
方法は、延伸に適した温度領域（延伸温度領域）が８０
〜１００℃度であるポリエチレン樹脂を可塑状態を維持
する２００℃程度でダイスから押し出し、押し出された
可塑状態のポリエチレン樹脂を引っ張って延伸させると
共に押出直後に常温の水中に導いて冷却させるものであ
った。Conventionally, in the manufacturing method of synthetic resin net made of polyethylene resin, the temperature range suitable for stretching (stretching temperature range) is 80°C.
Polyethylene resin at a temperature of ~100°C is extruded from a die at about 200°C to maintain a plastic state, and the extruded plastic polyethylene resin is pulled and stretched, and immediately after extrusion, it is introduced into water at room temperature to cool it. Ta.
ところで、ポリエチレン樹脂を含めて一般の熱可塑性合
成樹脂を延伸する場合、延伸時の温度が高すぎると引張
強度を高めるといったような延伸効果が付与されない。By the way, when stretching general thermoplastic synthetic resins including polyethylene resins, if the temperature during stretching is too high, stretching effects such as increasing tensile strength will not be imparted.
その反面、延伸時の温度が低すぎると十分に延伸を行え
ない。従って、十分な延伸効果を付与させるためには可
塑状態の合成樹脂材料を延伸温度領域で延伸させること
が必要である。On the other hand, if the temperature during stretching is too low, sufficient stretching cannot be achieved. Therefore, in order to impart a sufficient stretching effect, it is necessary to stretch the plastic synthetic resin material in the stretching temperature range.
しかしながら、上述した従来の製造方法では、可塑状態
のポリエチレン樹脂が押出直後に延伸されることと相前
後して常温の水中に導かれて急冷されるため、延伸状態
が各部で均一になりにく（、その結果、成形品である合
成樹脂ネットの縦糸や横糸の引張強度にむらが生じ、ま
たそれらの太さも均一になりにくいという問題があった
。ネット以外の成形品を延伸工程を経て製造する場合に
も同様の問題があった。However, in the conventional manufacturing method described above, the polyethylene resin in a plastic state is stretched immediately after extrusion, and then simultaneously introduced into water at room temperature and rapidly cooled, making it difficult for the stretched state to be uniform in each part. (As a result, there was a problem that the tensile strength of the warp and weft of the synthetic resin net, which is a molded product, was uneven, and the thickness of these threads was also difficult to make uniform. Molded products other than nets were manufactured through a stretching process. There was a similar problem when doing so.
本発明はこの問題に鑑みてなされたもので、均一な延伸
温度領域で延伸工程を完結させた後に冷却を行えるよう
にすることによって、引張強度等の機械的強度が各部で
均一化され、かつ合成樹脂ネットを製造する場合にはそ
の縦糸や横糸の各部の太さが均一になる合成樹脂押出成
形方法を提供することを目的とする。The present invention was made in view of this problem, and by enabling cooling after completing the stretching process in a uniform stretching temperature range, mechanical strength such as tensile strength can be made uniform in each part, and It is an object of the present invention to provide a synthetic resin extrusion molding method that makes the warp and weft threads uniform in thickness when producing a synthetic resin net.
本発明の合成樹脂押出成形方法は、水槽内の水の上層部
と下層部に温度差が付与され、かつ上層部の水温を上記
合成樹脂材料の延伸温度領域に設定し、下層部の水温を
上記延伸温度領域よりも低温に設定した状態で、ダイス
から押し出された可塑状態の合成樹脂材料を上記水槽内
に導き、その合成樹脂材料の延伸工程を合成樹脂材料が
上記上層部を通過中に完結させることを特徴とする合成
樹脂押出成形方法。In the synthetic resin extrusion molding method of the present invention, a temperature difference is given between the upper layer and the lower layer of water in the water tank, and the water temperature of the upper layer is set in the stretching temperature range of the synthetic resin material, and the water temperature of the lower layer is set to The plasticized synthetic resin material extruded from the die is guided into the water tank while the temperature is set lower than the stretching temperature range, and the stretching process of the synthetic resin material is carried out while the synthetic resin material passes through the upper layer. A synthetic resin extrusion molding method characterized by complete molding.
添付図を参照して本発明実施例を説明する。同図におい
て、１は連続押出機に設置されたダイスで、このダイス
からは可塑状態の縦糸と横糸とが一体化された合成樹脂
材料、具体的にはポリエチレン樹脂２が筒状に押し出さ
れる。ダイスから押し出される可塑状態の縦糸と横糸は
成形品である合成樹脂ネットの縦糸と横糸よりも太いも
のであり、後述する延伸工程を経ることによって所定の
一３＝
寸法に揃えられる。Embodiments of the present invention will be described with reference to the accompanying drawings. In the figure, reference numeral 1 denotes a die installed in a continuous extruder, from which a synthetic resin material in which warp and weft in a plastic state are integrated, specifically polyethylene resin 2, is extruded into a cylindrical shape. The plastic warp and weft extruded from the die are thicker than the warp and weft of the synthetic resin net that is the molded product, and are made to have a predetermined size by going through the stretching process described below.
Ｗは図示していない水槽内の水の水面を示しており、こ
の水面Ｗは上記ダイス１の直下に設定されている。ダイ
ス１からの水面Ｗの離間幅は合成樹脂材料やその押出時
の温度、さらには合成樹脂材料の押出速度等に関係する
ものであるが、−船釣にはできるだけ短いことが望まれ
る。W indicates a water surface in a water tank (not shown), and this water surface W is set directly below the dice 1. Although the distance between the water surface W and the die 1 is related to the synthetic resin material, the temperature at the time of extrusion, and the extrusion speed of the synthetic resin material, it is desired to be as short as possible for boat fishing.
上記水槽内には上下二段に亘って仕切り３，４が設けら
れており、上段の仕切り３の上層部の水温ｔ、はポリエ
チレン樹脂の延伸温度領域である８０〜１００℃に設定
され、下段の仕切り４の下層部の水温ｔ２は常温（３０
〜５０℃）に設定され、各仕切り３．４の間の中間層の
水温ｔ３はそれらの中間の温度、例えば６０〜７０℃程
度に設定されている。そして、各仕切り３．４により上
層部、中間層及び下層部の相互間の水の流動を抑制され
てそれら各層の温度分布が乱されないようになっている
。なお、上記中間層は必ずしも設定する必要はなく、上
層部と下層部との間の温度差が大きい場合には中間層を
設定することによって上層部の水温と下層部の水温が影
響し合ってそれら各層の温度分布が乱されることが抑制
される利点がある。In the water tank, partitions 3 and 4 are provided in two stages, upper and lower. The water temperature t in the upper part of the upper partition 3 is set at 80 to 100°C, which is the stretching temperature range of polyethylene resin, and The water temperature t2 in the lower part of the partition 4 is room temperature (30
~50°C), and the water temperature t3 of the intermediate layer between each partition 3.4 is set to an intermediate temperature between them, for example, about 60 to 70°C. Each partition 3.4 suppresses the flow of water between the upper layer, middle layer and lower layer, so that the temperature distribution in each layer is not disturbed. Note that it is not necessary to set the above-mentioned intermediate layer; if there is a large temperature difference between the upper layer and the lower layer, setting an intermediate layer will allow the water temperature in the upper layer and the water temperature in the lower layer to influence each other. There is an advantage in that the temperature distribution in each layer is prevented from being disturbed.
ダイス１から可塑状態で押し出されたポリエチレン樹脂
２には所定の引張力Ｆが加えられ、その引張力によりポ
リエチレン樹脂２がサイジング５に押し拡げられながら
かぶさって縦方向（縦糸）と横方向（横糸）の延伸工程
が行われる。上記引張力Ｆはポリエチレン樹脂２がサイ
ジング５の肩部にかぶさっている範囲であるＣ−Ｄ間に
おける引張力向の延伸力と拡幅方向の延伸力とに均衡す
るが、ダイス１から出た直後の可塑化部分Ｅに対しては
そのまま作用し、ダイス１からのポリエチレン樹脂２の
押出速度が延伸速度よりも遅い場合には上記可塑化部分
Ｅが無制限に延伸されてしまう。ダイス１からのポリエ
チレン樹脂２の押出速度を延伸速度と同等に調節してお
けばそのような事態を避けることが可能である。A predetermined tensile force F is applied to the polyethylene resin 2 extruded from the die 1 in a plastic state, and the tensile force causes the polyethylene resin 2 to be expanded and covered with the sizing 5, so that the polyethylene resin 2 is stretched in the longitudinal direction (warp) and transverse direction (weft). ) stretching process is performed. The above tensile force F is balanced by the stretching force in the tensile force direction and the stretching force in the width expanding direction between C and D, which is the range where the polyethylene resin 2 covers the shoulder of the sizing 5, but immediately after leaving the die 1. This acts directly on the plasticized portion E, and if the extrusion speed of the polyethylene resin 2 from the die 1 is slower than the stretching speed, the plasticized portion E will be stretched indefinitely. Such a situation can be avoided if the extrusion speed of the polyethylene resin 2 from the die 1 is adjusted to be equal to the stretching speed.
この延伸工程はポリエチレン樹脂２がダイス１から押し
出された直後で水中に入る前の段階と水中に入ったポリ
エチレン樹脂２が上記上層部を通６一
遇する間とで完結するように行われるが、実質的な延伸
工程は上記上層部を通過中に行われるようにすることが
望ましく、そのためには上述した離間幅をできるだけ短
くしておくことが有効である。This stretching process is completed immediately after the polyethylene resin 2 is extruded from the die 1 and before it enters the water, and during the time when the polyethylene resin 2 that has entered the water passes through the upper layer. It is desirable that the substantial stretching process be performed while passing through the upper layer, and for this purpose it is effective to keep the above-mentioned separation width as short as possible.
なお、ポリエチレン樹脂２への引張力の付与は、冷却工
程を終了した成形品である合成樹脂ネット２ａを転向ロ
ーラ６に巻き掛けて矢印方向に引っ張ることにより付与
されている。延伸工程が上記上層部で完結されることに
より、上記中間層や下層部ではポリエチレン樹脂２は全
く延伸されず、延伸を完結したポリエチレン樹脂２が中
間層を通過中に予冷され、下層部を通過中に冷却される
。Note that the tensile force is applied to the polyethylene resin 2 by wrapping the synthetic resin net 2a, which is a molded product that has undergone a cooling process, around the turning roller 6 and pulling it in the direction of the arrow. Since the stretching process is completed in the upper layer, the polyethylene resin 2 is not stretched at all in the intermediate layer or lower layer, and the polyethylene resin 2 that has completed stretching is precooled while passing through the intermediate layer and passes through the lower layer. cooled inside.
このような製造方法によって製造されたポリエチレン樹
脂製の合成樹脂ネットは、縦糸や横糸の太さが各部でほ
ぼ均一になっており、引張強度もネットの各部で均一に
なっていた。In the synthetic resin net made of polyethylene resin manufactured by such a manufacturing method, the thickness of the warp and weft yarns was almost uniform in each part, and the tensile strength was also uniform in each part of the net.
この実施例ではポリエチレン樹脂２を押し出して縦糸と
横糸を有する合成樹脂ネットを製造する場合について説
明したが、他の種類の熱可塑性合成樹脂、例えばポリ塩
化ビニル樹脂製のネットを製造する場合でも同様に適用
できる。また、ネット以外の成形品、例えばシートやフ
ィルムを製造する場合でも同様に適用できる。This example describes the case where a synthetic resin net having warp and weft yarns is manufactured by extruding the polyethylene resin 2, but the same method can be used when manufacturing a net made of other types of thermoplastic synthetic resin, such as polyvinyl chloride resin. Applicable to Furthermore, the present invention can be similarly applied to the production of molded products other than nets, such as sheets and films.
以上説明した本発明による合成樹脂押出成形方法による
と、均一な延伸温度領域で延伸工程が完結され、延伸工
程の完結した合成樹脂材料に対して冷却工程が行われる
ため、引張強度等の機械的強度が各部で均一化された成
形品が得られる。特に、本発明によって合成樹脂ネット
を製造すると、縦糸や横糸の各部の太さが均一で引張強
度等の機械的強度に優れた成形品が得られ、そのような
ネットは冒頭に記載した土木工事等に使用されるネット
として好適なものである。According to the synthetic resin extrusion molding method of the present invention described above, the stretching process is completed in a uniform stretching temperature range, and the cooling process is performed on the synthetic resin material after the stretching process has been completed, so that mechanical properties such as tensile strength etc. A molded product with uniform strength in each part can be obtained. In particular, when a synthetic resin net is manufactured according to the present invention, a molded product with uniform warp and weft thicknesses and excellent mechanical strength such as tensile strength can be obtained, and such a net can be used for the civil engineering work described at the beginning. It is suitable as a net used for etc.
図は本発明方法の説明図である。
１・・・ダイス、２・・・ポリエチレン樹脂（合成樹脂
材料）、２ａ・・・ネット（成形品）、Ｗ・・・水面、
ｔ。
・・・上層部の水温、ｔ２・・・下層部の水温。The figure is an explanatory diagram of the method of the present invention. 1... Dice, 2... Polyethylene resin (synthetic resin material), 2a... Net (molded product), W... Water surface,
t. ...Water temperature in the upper layer, t2...Water temperature in the lower layer.
Claims (1)
を延伸させて所望の成形品を得る合成樹脂押出成形方法
であって、 水槽内の水の上層部と下層部に温度差が付与され、かつ
上層部の水温を上記合成樹脂材料の延伸温度領域に設定
し、下層部の水温を上記延伸温度領域よりも低温に設定
した状態で、上記合成樹脂材料を上記水槽内に導き、上
記合成樹脂材料の延伸工程を合成樹脂材料が上記上層部
を通過中に完結させることを特徴とする合成樹脂押出成
形方法。(1) A synthetic resin extrusion molding method for obtaining a desired molded product by stretching a synthetic resin material extruded in a plastic state from a die, in which a temperature difference is provided between the upper layer and the lower layer of water in a water tank, With the water temperature in the upper layer set in the stretching temperature range of the synthetic resin material and the water temperature in the lower layer lower than the stretching temperature range, the synthetic resin material is guided into the water tank, and the synthetic resin is A synthetic resin extrusion molding method characterized in that the stretching step of the material is completed while the synthetic resin material is passing through the upper layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33685287A JPH0764014B2 (en) | 1987-12-29 | 1987-12-29 | Synthetic resin extrusion molding method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP33685287A JPH0764014B2 (en) | 1987-12-29 | 1987-12-29 | Synthetic resin extrusion molding method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01176543A true JPH01176543A (en) | 1989-07-12 |
| JPH0764014B2 JPH0764014B2 (en) | 1995-07-12 |
Family
ID=18303253
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP33685287A Expired - Lifetime JPH0764014B2 (en) | 1987-12-29 | 1987-12-29 | Synthetic resin extrusion molding method |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0764014B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112793198A (en) * | 2021-04-09 | 2021-05-14 | 山东国维复合材料科技有限公司 | Film forming method and system |
-
1987
- 1987-12-29 JP JP33685287A patent/JPH0764014B2/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112793198A (en) * | 2021-04-09 | 2021-05-14 | 山东国维复合材料科技有限公司 | Film forming method and system |
| CN112793198B (en) * | 2021-04-09 | 2021-07-02 | 山东国维复合材料科技有限公司 | Film forming method and system |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0764014B2 (en) | 1995-07-12 |
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