JPH02137911A - Dimensional control device for molded material in inflation molding line - Google Patents
Dimensional control device for molded material in inflation molding lineInfo
- Publication number
- JPH02137911A JPH02137911A JP63292967A JP29296788A JPH02137911A JP H02137911 A JPH02137911 A JP H02137911A JP 63292967 A JP63292967 A JP 63292967A JP 29296788 A JP29296788 A JP 29296788A JP H02137911 A JPH02137911 A JP H02137911A
- Authority
- JP
- Japan
- Prior art keywords
- take
- extrusion
- width
- extrusion amount
- raw material
- 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 description 13
- 239000000463 material Substances 0.000 title claims description 3
- 238000001125 extrusion Methods 0.000 claims abstract description 75
- 239000002994 raw material Substances 0.000 claims abstract description 37
- 229920005989 resin Polymers 0.000 claims abstract description 24
- 239000011347 resin Substances 0.000 claims abstract description 24
- 238000009499 grossing Methods 0.000 claims abstract description 4
- 238000001514 detection method Methods 0.000 claims description 15
- 230000004580 weight loss Effects 0.000 claims description 3
- 238000000034 method Methods 0.000 abstract description 3
- 239000010408 film Substances 0.000 description 26
- 238000010586 diagram Methods 0.000 description 10
- 238000001816 cooling Methods 0.000 description 5
- 238000006073 displacement reaction Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000013585 weight reducing agent Substances 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- BZHJMEDXRYGGRV-UHFFFAOYSA-N Vinyl chloride Chemical compound ClC=C BZHJMEDXRYGGRV-UHFFFAOYSA-N 0.000 description 1
- 230000001934 delay Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- 238000003079 width control 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
- 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
- B29C48/92—Measuring, controlling or regulating
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/92114—Dimensions
- B29C2948/92133—Width or height
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92009—Measured parameter
- B29C2948/9218—Weight
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92361—Extrusion unit
- B29C2948/92371—Inlet shaft or slot, e.g. passive hopper; Injector, e.g. injector nozzle on barrel
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92323—Location or phase of measurement
- B29C2948/92438—Conveying, transporting or storage of articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/9259—Angular velocity
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
-
- 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
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92933—Conveying, transporting or storage of articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- 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
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- 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
- B29C48/0019—Combinations of extrusion moulding with other shaping operations combined with shaping by flattening, folding or bending
-
- 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
Abstract
Description
【発明の詳細な説明】
（産業上の利用分野）
本発明は、円筒フィルム状の成形物の押出しを連続して
行うインフレーション成形ラインにおける成形物の寸法
制御装置に関する。DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a device for controlling the dimensions of a molded product in an inflation molding line that continuously extrudes a cylindrical film-like molded product.
（従来の技術）
従来より、成形物の寸法を一定値に制御する方法として
、例えば特開昭６０−２１８７１３号公報に記載の装置
が提案されている。(Prior Art) Conventionally, as a method for controlling the dimensions of a molded product to a constant value, an apparatus described in, for example, Japanese Patent Laid-Open No. 60-218713 has been proposed.
すなわち、計量器によって所定時間当たりの樹脂消費量
を計測すると共に、この計測した樹脂消重量から押出機
の押出量を測定し、この押出量に基いて押出機の押出速
度又は引取機の回転速度を演算、調節することにより、
成形物の厚みを一定値に制御するものである。That is, the amount of resin consumed per predetermined time is measured with a measuring device, the amount of extrusion of the extruder is measured from this measured weight of resin consumed, and the extrusion speed of the extruder or the rotational speed of the take-off machine is determined based on this amount of extrusion. By calculating and adjusting
This is to control the thickness of the molded product to a constant value.
（発明が解決しようとする課題）
しかしながら、上記したように所定時間当たりの樹脂消
費量から押出量を測定する方法では、ある一定時開光た
りの平均押出量を測定しているため、短い周期で発生す
る実際の押出量の変動に対しては、時間の遅れによる測
定誤差があるために、十分に対応しきれないといった問
題があった。(Problem to be solved by the invention) However, as described above, in the method of measuring the extrusion amount from the amount of resin consumed per predetermined time, the average extrusion amount per certain period of time is measured. There is a problem in that it is not possible to adequately respond to fluctuations in the actual extrusion amount that occur due to measurement errors due to time delays.
本発明は係る実情に鑑みてなされたもので、その目的は
、短い周期で発生する実際の押出量の変動に対しても、
これに追従して成形物の厚みを一定値に制御できるイン
フレーション成形ラインにおける成形物の寸法制御装置
を提供するものである。The present invention was made in view of the above-mentioned circumstances, and its purpose is to respond to fluctuations in the actual extrusion amount that occur in short cycles.
The present invention provides a size control device for a molded product in an inflation molding line that can follow this and control the thickness of the molded product to a constant value.
（課題を解決するための手段）
上記課題を解決するため、本発明は、原料収納部に収納
された原料の樹脂を押出機に供給すると共に、該押出機
によって加熱、混練された溶融樹脂を引取機によって引
取ることにより、円筒フィルム状の成形物の押出しを連
続して行うインフレーション成形ラインにおいて、前記
原料収納部に収納された原料の重量減少速度を連続して
測定することにより、単位時間当たりの押出機への実際
の押出量を計測する実押出量計測手段と、この実押出量
計測手段によって計測された実押出量を平滑処理するこ
とにより押出機への押出量を演算する押出量演算手段と
、前記引取機によって引取られる成形物の幅を検出する
幅検出手段と、前記押出量演算手段によって演算された
押出量の値、前記幅検出手段によって検出された成形物
の検出幅及び予め設定された成形物の厚み目標値に基き
、成形物の実際の厚みを前記厚み目標値に一致させるよ
うに前記押出機のスクリュー回転速度又は前記引取機の
引取速度を制御する制御手段とを備えたものである。(Means for Solving the Problems) In order to solve the above problems, the present invention supplies the raw material resin stored in the raw material storage section to an extruder, and also supplies the molten resin heated and kneaded by the extruder. In an inflation molding line that continuously extrudes a cylindrical film-like molded product by taking it off with a take-off machine, the rate of weight loss of the raw material stored in the raw material storage section is continuously measured, and the weight reduction rate is measured per unit time. an actual extrusion rate measuring means for measuring the actual extrusion rate to the extruder; and an extrusion rate for calculating the extrusion rate by smoothing the actual extrusion rate measured by the actual extrusion rate measuring means. a calculation means, a width detection means for detecting the width of the molded product taken up by the take-up machine, a value of the extrusion amount calculated by the extrusion amount calculation means, a detected width of the molded product detected by the width detection means, and control means for controlling the screw rotation speed of the extruder or the take-up speed of the take-off machine, based on a preset thickness target value of the molded product, so that the actual thickness of the molded product matches the thickness target value; It is prepared.
（作用）
実押出量計測手段により、原料収納部に収納された原料
の重量減少速度を連続して測定し、単位時間当たりの押
出機への実際の押出量を計測する。(Function) The actual extrusion amount measuring means continuously measures the weight reduction rate of the raw material stored in the raw material storage section, and measures the actual extrusion amount to the extruder per unit time.
原料の重Ｎ減少速度は、押出機に供給される原料の量に
等しいことから、この計測値は、瞬時的な押出量の値を
正確に求めた値となっている。この実押出量計測手段に
よって計測された実押出量を、押出量演算手段によって
平滑処理することにより、押出機への押出量を演算する
。このようにして演算された押出量は、瞬時的な押出量
の変動を吸収した値となっている。この押出量と、幅検
出手段によって検出された成形物の検出幅と、予め設定
された成形物の厚み目標値とに基いて、押出機のスクリ
ュースピード又は引取機の引取速度を制御手段によって
制御することにより、成形物の実際の厚みを厚み目標値
に一致させる。Since the weight N reduction rate of the raw material is equal to the amount of raw material supplied to the extruder, this measured value is a value that accurately determines the instantaneous extrusion amount. The actual extrusion amount measured by the actual extrusion amount measuring means is smoothed by the extrusion amount calculating means to calculate the extrusion amount to the extruder. The extrusion amount calculated in this manner is a value that absorbs instantaneous fluctuations in the extrusion amount. The control means controls the screw speed of the extruder or the take-off speed of the take-off machine based on this extrusion amount, the detected width of the molded product detected by the width detection means, and a preset target thickness of the molded product. By doing so, the actual thickness of the molded product is made to match the target thickness value.
（実施例） 以下、本発明の一実施例を図面を参照して説明する。(Example) Hereinafter, one embodiment of the present invention will be described with reference to the drawings.
第１図は、本発明の寸法制御装置を備えたインフレーシ
ョン成形装置の概略構成を示している。FIG. 1 shows a schematic configuration of an inflation molding apparatus equipped with a dimensional control device of the present invention.
同図において、この成形装置は、原料の樹脂を保存して
おく原料タンク１と、樹脂原料を供給するホッパ２と、
樹脂原料を加熱、混練して溶融樹脂をつくる押出機３と
、溶融樹脂を円筒フィルム状に引取る引取機４と、円筒
フィルム状に引取られた成形物を巻取る巻取機５と、こ
れらの動作制御を司るための制御演算を行うＣＰＵ６と
を備えている。また、原料となる樹脂の材質としては、
ポリエチレン、ポリプロピレン、塩化ビニル等の熱可塑
性樹脂が用いられる。In the figure, this molding apparatus includes a raw material tank 1 for storing raw resin, a hopper 2 for supplying resin raw material,
An extruder 3 that heats and kneads resin raw materials to produce a molten resin, a take-up machine 4 that takes up the molten resin in the form of a cylindrical film, and a winder 5 that winds up the molded product taken in the form of a cylindrical film; It is equipped with a CPU 6 that performs control calculations for controlling the operation of the computer. In addition, the material of the resin that is the raw material is:
Thermoplastic resins such as polyethylene, polypropylene, and vinyl chloride are used.
原料タンク１からホッパ２への供給路には、原料である
樹脂の供給量を制御するためのバルブ１２が設けられて
おり、ホッパ２には、ホッパ２内に投入された樹脂の重
量を検出する重量検出センサ７と、投入された樹脂の高
さレベルを検出するための下限レベルセンサ１０及び上
限レベルセンサ１１を含むレベルセンナ（図示省略）と
が設けられている。The supply path from the raw material tank 1 to the hopper 2 is provided with a valve 12 for controlling the supply amount of the raw material resin, and the hopper 2 has a valve 12 that detects the weight of the resin put into the hopper 2. A level sensor (not shown) including a lower limit level sensor 10 and an upper limit level sensor 11 for detecting the height level of the charged resin is provided.
このホッパ２は、押出機３の後部に設置されており、押
出機３の押出方向Ａ１の前方には金型１３が連結されて
いる。この金型１３から円筒状薄膜樹脂（以下、インフ
レーションフィルムという。）１４が上方に向けて押し
出される。押出機３には、図示しない押出用モータによ
って回転駆動される押出スクリュー１５が設けられ、ホ
ッパ２から投入された樹脂はこの押出スクリュー１５に
よって金型１３へ順次押し出される。また、押出機３の
近傍には、エアーポンプ９が設けられ、このエアーポン
プ９から供給されるエアーは、金型１３内を通過して、
押出方向である上方Ａ２へ吹上げられる構成となってい
る。This hopper 2 is installed at the rear of the extruder 3, and a mold 13 is connected to the front of the extruder 3 in the extrusion direction A1. A cylindrical thin film resin (hereinafter referred to as inflation film) 14 is extruded upward from this mold 13 . The extruder 3 is provided with an extrusion screw 15 that is rotationally driven by an extrusion motor (not shown), and the resin introduced from the hopper 2 is sequentially extruded into the mold 13 by the extrusion screw 15. Further, an air pump 9 is provided near the extruder 3, and the air supplied from the air pump 9 passes through the mold 13.
It is configured to be blown upward A2, which is the extrusion direction.
金型１３の上方には、押出されたインフレーションフィ
ルム１４を冷却するための冷却エアーを送風する冷却袋
Ｗ１６が、該インフレーションフィルム１４の周囲を囲
むように配置されている。A cooling bag W16 that blows cooling air for cooling the extruded blown film 14 is arranged above the mold 13 so as to surround the periphery of the blown film 14.
この冷却装置工６には、図示は省略しているが、エアー
の送風量を調節するニアリング風量調整弁が設けられて
おり、該ニアリング風量調整弁によって風量を調整する
ことにより、フロストラインの位置を管理するようにな
っている。Although not shown in the drawings, the cooling device 6 is provided with a nearing air volume adjustment valve that adjusts the amount of air blown, and by adjusting the air volume with the nearing air volume adjustment valve, the position of the frost line can be adjusted. It is supposed to be managed.
また、冷却装置１６のさらに上方には、インフレーショ
ンフィルム１４を案内するための案内板１８ａ、１８ｂ
が「ハ」の字状に配置され、このＸ内！＆１８ ａ、
１８ ｂ＠通ったインフレーションフィルム１４は、
図示しない引取用モータによって回転駆動されるローラ
４ａ、４ｂからなる引取機４を介して二つ折りに折り畳
まれた後、幅センサ８を介して巻取機５に巻取られる。Further, above the cooling device 16, there are guide plates 18a and 18b for guiding the blown film 14.
are arranged in a “ha” shape, and within this X! &18a,
18 b@The blown film 14 that passed through
After being folded into two by a take-up machine 4 consisting of rollers 4a and 4b which are rotationally driven by a take-up motor (not shown), the sheet is wound up by a take-up machine 5 via a width sensor 8.
ＣＰＵ６には、ホッパ２に設けられた下限レベルセンサ
１０、上限レベルセンサ１１、重量レベルセンサ７等に
よって検出された各レベル信号、及び幅センサ８からの
幅検出信号の他、図示は省略しているが押出機３の押出
用モータからの回転速度信号及び引取機４の引取用モー
タからの回転速度信号等が入力されている。ＣＰＵ６は
これらの入力信号に基き、ＣＰＵ６内の各演算ブロック
及び判断ブロックにおいて演算、判断等の処理を行うこ
とにより、バルブ１２、押出機３、引取機４、及びエア
ーポンプ９等の各制御対象の一連の動作制御を行ってい
る。The CPU 6 includes each level signal detected by the lower limit level sensor 10, upper limit level sensor 11, weight level sensor 7, etc. provided in the hopper 2, and the width detection signal from the width sensor 8, as well as other signals (not shown). However, a rotation speed signal from the extrusion motor of the extruder 3 and a rotation speed signal from the take-up motor of the take-up machine 4 are input. Based on these input signals, the CPU 6 performs processing such as calculation and judgment in each calculation block and judgment block in the CPU 6, thereby controlling each control target such as the valve 12, extruder 3, take-up machine 4, and air pump 9. A series of operations are controlled.
次に、上記構成のインフレーシゴン成形装置の動作を、
第２図乃至第５図に示す各部の制御ブロック図及びフロ
ーチャートを参照して説明する。Next, the operation of the inflate molding device with the above configuration is as follows.
This will be explained with reference to control block diagrams and flowcharts of each section shown in FIGS. 2 to 5.
原料タンクｌに保存された樹脂原料は、バルブ１２を介
することによりホッパ２に供給される。The resin raw material stored in the raw material tank l is supplied to the hopper 2 via a valve 12.
ホッパ２には、下限レベルセンサ１０及び上限レベルセ
ンサ１１を含むレベルセンサ２０（第５図参照）が設け
られており、このレベルセンサ２０によるレベル検出信
号に基いて、バルブ１２の開閉制御を行っている。The hopper 2 is equipped with a level sensor 20 (see FIG. 5) that includes a lower limit level sensor 10 and an upper limit level sensor 11. Based on the level detection signal from this level sensor 20, the opening and closing of the valve 12 is controlled. ing.
第５図は、原料タンク１からホッパ２への樹脂原料の供
給制御のブロック図を示している。FIG. 5 shows a block diagram of supply control of the resin raw material from the raw material tank 1 to the hopper 2.
すなわち、レベルセンサ２０でホッパ２内の残り原料を
監視し、残り原料の高さが下限レベルセンサ１０の位置
まで達すると、ホッパ供給判断ブロンク２１の判断によ
り、通常は閉じているバルブ１２を開制御して、原料タ
ンク１からホッパ２内へ原料を供給し、上限レベルセン
サ１１の位置まで原料を補給する。That is, the level sensor 20 monitors the remaining raw material in the hopper 2, and when the height of the remaining raw material reaches the position of the lower limit level sensor 10, the normally closed valve 12 is opened based on the judgment of the hopper supply judgment block 21. The raw material is controlled to be supplied from the raw material tank 1 into the hopper 2, and the raw material is replenished to the position of the upper limit level sensor 11.
このようにして、ホッパ１２に供給された原料は、順次
押出機３に供給され、押出スクリュー１５によって前方
の金型１３に向かって押し出される。In this way, the raw materials supplied to the hopper 12 are sequentially supplied to the extruder 3 and extruded toward the mold 13 in front by the extrusion screw 15.
このときの押出機３の押出量は、ホッパ２に設けられた
重量検出センサ７によって検出された重量検出信号に基
いて計測される。すなわち、この重量検出センサ７は、
ホッパ２内の原料の減少速度を連続測定している。した
がって、この減少速度は押出機３に供給される樹脂量で
あるから、単位時間当りの実押出量に等しいことになる
。よって、ホッパ２内の樹脂の減少速度を重量検出セン
サ７で検出することにより、単位時間当りの実押出量Ｘ
を計測することができる。この実押出ＩＸは、瞬時的に
変動する押出量を正確に計測した値となっている。The amount of extrusion from the extruder 3 at this time is measured based on a weight detection signal detected by a weight detection sensor 7 provided in the hopper 2. That is, this weight detection sensor 7 is
The decreasing rate of the raw material in the hopper 2 is continuously measured. Therefore, since this rate of decrease is the amount of resin supplied to the extruder 3, it is equal to the actual amount of extrusion per unit time. Therefore, by detecting the decreasing rate of resin in the hopper 2 with the weight detection sensor 7, the actual extrusion amount per unit time
can be measured. This actual extrusion IX is a value obtained by accurately measuring the extrusion amount, which changes instantaneously.
そして、この実押出ｉｌＸに基いて、インフレーション
フィルム１４の厚みを制御する。この制御ブロック図を
第２図に示す。また、厚み制御のための演算処理のフロ
ーチャートを第３図に示す。Then, the thickness of the blown film 14 is controlled based on this actual extrusion ilX. This control block diagram is shown in FIG. Further, a flowchart of calculation processing for thickness control is shown in FIG.
第２図において、まず、重量検出センサ７によって計測
された実押出量Ｘをフィルタ部３１に入力し、押出量Ｑ
を求める。すなわち、デジタルフィルタｆ （Ｘ）によ
り実押出１ｘから押出量Ｑを演算する（ステップ■）。In FIG. 2, first, the actual extrusion amount X measured by the weight detection sensor 7 is input to the filter section 31, and the extrusion amount Q
seek. That is, the extrusion amount Q is calculated from the actual extrusion 1x using the digital filter f (X) (step 2).
このように、デジタルフィルタｆ （Ｘ）を通すことに
より、実押出１ｘの短周期の変動による影響をなくして
いる。In this way, by passing the digital filter f (X), the influence of short-period fluctuations in the actual extrusion 1x is eliminated.
デジタルフィルタｆ （Ｘ） としては、（１）式に示
す１次遅れフィルタや、（２）式に示す移動平均フィル
タ等を用いる。As the digital filter f (X), a first-order lag filter shown in equation (1), a moving average filter shown in equation (2), or the like is used.
ただし、Ｔ（時定数）、ｈ（刻み幅）は、特性に応じて
適当な値を設定する。However, T (time constant) and h (step width) are set to appropriate values depending on the characteristics.
このようにして求めた押出量Ｑを引取速度演算ブロック
３２に入力することにより、該引取速度演算ブロック３
２に入力された輻センサ８からのフィルム幅Ｗ及び厚み
目標値Ｄ０と、この押出量Ｑとによって、引取機４の引
取速度りを（３）式より求める（ステップ■）。By inputting the extrusion amount Q obtained in this way to the take-off speed calculation block 32, the take-off speed calculation block 3
The take-up speed of the take-off machine 4 is determined from equation (3) using the film width W and thickness target value D0 from the radius sensor 8 input to step 2 and this extrusion amount Q (step 2).
ただし、Ｋ：比例定数
ＣＰＵ６は、引取機４の引取速度が（３）式で求められ
た引取速度りとなるように、引取機４を駆動する引取用
モータの回転を制御する。However, K: proportional constant The CPU 6 controls the rotation of the take-up motor that drives the take-up machine 4 so that the take-up speed of the take-up machine 4 becomes the take-up speed determined by equation (3).
一方、フィルム幅を一定に保つために、幅センサ８で検
出されたフィルム幅Ｗに基いて幅制御を行う。この制御
ブロック図を第４図に示す。On the other hand, in order to keep the film width constant, width control is performed based on the film width W detected by the width sensor 8. This control block diagram is shown in FIG.
すなわち、幅センサ８によって測定されたフィルム幅Ｗ
と幅目標値Ｗ８との差を求め、これをエアーポンプ吸排
気量演算ブロック４１に入力する。That is, the film width W measured by the width sensor 8
The difference between the width target value W8 and the width target value W8 is determined and inputted to the air pump suction/displacement amount calculation block 41.
そして、このエアーポンプ吸排気量演算ブロック４１に
おいてエアーポンプ９の吸・排気量を演算し、この演算
結果に基く制御信号を成形装置のエアーポンプ９に送出
することによりエアーポンプ９の吸・排気量を制御して
、フィルム幅Ｗを幅目標値Ｗ、と一致させる制御を行う
。すなわち、フィルム幅Ｗが幅目標値Ｗ８より狭い場合
には、エアーポンプ９の吸・排気量を増やすことにより
フィルム幅は広くなり、フィルム幅Ｗが幅目標値Ｗ０よ
り広い場合には、エアーポンプ９の吸・排気量を減らす
ことによりフィルム幅は狭くなる。Then, the air pump suction/exhaust amount calculation block 41 calculates the suction/exhaust amount of the air pump 9, and sends a control signal based on the calculation result to the air pump 9 of the molding device, thereby air suction/exhaust of the air pump 9. The film width W is controlled to match the width target value W by controlling the amount. That is, when the film width W is narrower than the width target value W8, the film width becomes wider by increasing the suction/displacement amount of the air pump 9, and when the film width W is wider than the width target value W0, the air pump The film width becomes narrower by reducing the suction/exhaust amount of 9.
以上のようにしてインフレーション成形装置の各部の制
御を行うことにより、瞬時的な押出量の変動があっても
、インフレーションフィルム１４の厚みを目標の一定値
に保つことができる。By controlling each part of the inflation molding apparatus as described above, the thickness of the inflation film 14 can be maintained at a constant target value even if there is an instantaneous fluctuation in the extrusion amount.
なお、原料タンク１からホッパ２に原料を供給している
間は、重量検出センサ７による押出機３への原料の実押
出量Ｘの測定は中止する。そして、その間は直前の引取
速度データを保持することにより、この引取速度データ
に基いて引取機４の引取速度の制御を行う。Note that while the raw material is being supplied from the raw material tank 1 to the hopper 2, measurement of the actual extrusion amount X of the raw material to the extruder 3 by the weight detection sensor 7 is stopped. During that time, the immediately preceding take-up speed data is held, and the take-up speed of the take-up machine 4 is controlled based on this take-up speed data.
また、上記実施例では、インフレーションフィルムの厚
みを一定とするために、引取機４の引取速度を制御する
ようにしているが、引取機４の引取速度を検出する速度
センサを設け、この速度センサによって検出された引取
速度Ｌ１と、幅センサ８で検出されたフィルム幅Ｗ及び
厚み目標値Ｄ０とから、（４）式によって押出機３の押
出スクリュー１５の回転速度Ｐを求め、この求めた回転
速度Ｐとなるように押出スクリューＩ５の回転を制御す
ることにより、インフレーションフィルムの厚みを一定
に制御することが可能である。Further, in the above embodiment, in order to keep the thickness of the blown film constant, the take-up speed of the take-up machine 4 is controlled, but a speed sensor is provided to detect the take-up speed of the take-up machine 4. The rotational speed P of the extrusion screw 15 of the extruder 3 is determined by equation (4) from the take-up speed L1 detected by the width sensor 8, and the film width W and thickness target value D0 detected by the width sensor 8. By controlling the rotation of the extrusion screw I5 so as to achieve the speed P, it is possible to control the thickness of the blown film to be constant.
Ｐ＝に−Ｗ−Ｄ、 −（４）ただし
、Ｋ：比例定数
（発明の効果）
以上説明したように、本発明のインフレーション成形ラ
インにおける成形物の寸法制御装置によれば、原料収納
部に収納された原料の重量減少速度を連続して測定する
ことにより、単位時間当たりの押出機への実際の押出量
を計測すると共に、この実押出量を平滑処理することに
より、押出機への押出量を演算しているので、押出量の
瞬時的な変動があっても、これに追従した正確な寸法制
御を行うことができる。P=-W-D, -(4) where K: proportionality constant (effect of the invention) As explained above, according to the size control device for molded products in an inflation molding line of the present invention, By continuously measuring the rate of weight loss of the stored raw materials, the actual amount of extrusion per unit time can be measured, and by smoothing this actual amount of extrusion, the amount of extrusion can be calculated. Since the amount is calculated, even if there is an instantaneous fluctuation in the extrusion amount, accurate dimensional control can be performed that follows this.
第１図は本発明の寸法制御装置を備えたインフレーショ
ン成形ラインの概略構成図、第２図は実押出量に基いて
インフレーションフィルムの厚み制御を行うための制御
ブロック図、第３図は第２図に示す制御ブロック図の動
作を説明するためのフローチャート、第４図は幅センサ
で検出されたフィルム幅に基いてインフレーションフィ
ルムの幅制御を行うための制御ブロラク図、第５図は原
料タンクからホッパに樹脂原料の供給を行うための制御
ブロック図である。
・・・原料タンク
・・・押出機
・・・巻取機
・・・重量検出センサ
・・・エアーポンプ
・・・下限レベルセンサ
・・・上限レベルセンサ
・・・レベルセンサ
・・・ホッパ供給判断ブロック
・・・フィルタ部
・・・引取速度演算ブロック
・・・エアーポンプ吸排気量演算ブロック２・・・ホッ
パ
４・・・引取機
６・・・ＣＰＵ
８・・・幅センサ
第２図
第１図
第４図Fig. 1 is a schematic configuration diagram of an inflation molding line equipped with the dimensional control device of the present invention, Fig. 2 is a control block diagram for controlling the thickness of the blown film based on the actual extrusion amount, and Fig. A flowchart for explaining the operation of the control block diagram shown in the figure, Figure 4 is a control block diagram for controlling the width of the blown film based on the film width detected by the width sensor, and Figure 5 is a control block diagram for controlling the width of the blown film based on the film width detected by the width sensor. It is a control block diagram for supplying resin raw material to a hopper. ... Raw material tank ... Extruder ... Winder ... Weight detection sensor ... Air pump ... Lower limit level sensor ... Upper limit level sensor ... Level sensor ... Hopper supply judgment Block...Filter section...Taking speed calculation block...Air pump suction/displacement amount calculation block 2...Hopper 4...Taking machine 6...CPU 8...Width sensor Fig. 2 Fig. 1 Figure 4
Claims (1)
すると共に、該押出機によって加熱、混練された溶融樹
脂を引取機によって引取ることにより、円筒フィルム状
の成形物の押出しを連続して行うインフレーション成形
ラインにおいて、 前記原料収納部に収納された原料の重量減 少速度を連続して測定することにより、単位時間当たり
の押出機への実際の押出量を計測する実押出量計測手段
と、 この実押出量計測手段によって計測された 実押出量を平滑処理することにより押出機への押出量を
演算する押出量演算手段と、 前記引取機によって引取られる成形物の幅 を検出する幅検出手段と、 前記押出量演算手段によって演算された押 出量の値、前記幅検出手段によって検出された成形物の
検出幅及び予め設定された成形物の厚み目標値に基き、
成形物の実際の厚みを前記厚み目標値に一致させるよう
に前記押出機のスクリュー回転速度又は前記引取機の引
取速度を制御する制御手段とを備えたことを特徴とする
インフレーション成形ラインにおける成形物の寸法制御
装置。[Claims] 1) The raw material resin stored in the raw material storage section is supplied to an extruder, and the molten resin heated and kneaded by the extruder is taken up by a take-up machine, thereby producing a cylindrical film-like material. In an inflation molding line that continuously extrudes molded products, the actual amount of extrusion into the extruder per unit time is measured by continuously measuring the rate of weight loss of the raw material stored in the raw material storage section. an actual extrusion amount measuring means for measuring the actual extrusion amount; an extrusion amount calculating means for calculating the extrusion amount to the extruder by smoothing the actual extrusion amount measured by the actual extrusion amount measuring means; and a molded product taken by the taking machine. width detection means for detecting the width of the extrusion amount; and a width detection means for detecting the width of the extrusion amount calculated by the extrusion amount calculation means, the detected width of the molded product detected by the width detection means, and a preset target thickness value of the molded product. ,
A molded product in an inflation molding line, comprising: a control means for controlling the screw rotation speed of the extruder or the take-up speed of the take-off machine so that the actual thickness of the molded product matches the thickness target value. dimensional control device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63292967A JPH02137911A (en) | 1988-11-18 | 1988-11-18 | Dimensional control device for molded material in inflation molding line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63292967A JPH02137911A (en) | 1988-11-18 | 1988-11-18 | Dimensional control device for molded material in inflation molding line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH02137911A true JPH02137911A (en) | 1990-05-28 |
Family
ID=17788746
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63292967A Pending JPH02137911A (en) | 1988-11-18 | 1988-11-18 | Dimensional control device for molded material in inflation molding line |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH02137911A (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716921A (en) * | 1991-02-15 | 1995-01-20 | Maruyasu:Kk | Inflation molding process and its apparatus |
| JP2002001800A (en) * | 2000-06-26 | 2002-01-08 | Toshiba Mach Co Ltd | Method for controlling weight type feeder of twin-screw extruder |
| US8206627B2 (en) | 2006-03-22 | 2012-06-26 | 3M Innovative Properties Company | Systems and methods of making molded composite blocks |
| JP2019177643A (en) * | 2018-03-30 | 2019-10-17 | 住友重機械工業株式会社 | Film forming apparatus and control device |
| CN113119439A (en) * | 2021-04-08 | 2021-07-16 | 贵州科泰天兴农业科技有限公司 | Precise control system and control method for mulching film diameter |
-
1988
- 1988-11-18 JP JP63292967A patent/JPH02137911A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0716921A (en) * | 1991-02-15 | 1995-01-20 | Maruyasu:Kk | Inflation molding process and its apparatus |
| JP2002001800A (en) * | 2000-06-26 | 2002-01-08 | Toshiba Mach Co Ltd | Method for controlling weight type feeder of twin-screw extruder |
| US8206627B2 (en) | 2006-03-22 | 2012-06-26 | 3M Innovative Properties Company | Systems and methods of making molded composite blocks |
| JP2019177643A (en) * | 2018-03-30 | 2019-10-17 | 住友重機械工業株式会社 | Film forming apparatus and control device |
| CN113119439A (en) * | 2021-04-08 | 2021-07-16 | 贵州科泰天兴农业科技有限公司 | Precise control system and control method for mulching film diameter |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4094940A (en) | Injection molding machine controls | |
| US3870445A (en) | Injection molding machine controls | |
| JPH03163611A (en) | Adjustment of level of mixture of fluid material consisting of at least two components in container having exit | |
| US3937776A (en) | Method for controlling injection molding machines | |
| JPS6179615A (en) | Method for monitoring manufacture of longitudinal molded shape | |
| JPH02137911A (en) | Dimensional control device for molded material in inflation molding line | |
| JPS6179616A (en) | Method and device for monitoring size of beltlike molded shape | |
| US5855830A (en) | Controlling device and method for extruder | |
| JPH02269024A (en) | Apparatus for control of emission amount of extruder with gear pump | |
| JPS62246713A (en) | Controlling film thickness in apparatus for manufacturing synthetic resin film | |
| JP3516730B2 (en) | Film forming method and forming apparatus | |
| JPH05245908A (en) | Extruding quantity control method of extruder with gear pump and its apparatus | |
| JPH0815753B2 (en) | Film width control device | |
| JPH01275123A (en) | Size-changing system of formed object in inflation molding | |
| JPH08300446A (en) | Film molding method and apparatus | |
| JPH08164554A (en) | Thickness control method for extrusion molding | |
| JP2856656B2 (en) | Extruder control unit | |
| JPH079551A (en) | Manufacturing device for blown film | |
| JPH0418324A (en) | Monitor for multilayer type extruder | |
| JPH0825463A (en) | Extrusion molding method and apparatus | |
| JPS63126719A (en) | Control method for extruder | |
| JP2832387B2 (en) | Film width controller for inflation film manufacturing machine | |
| JPH03261539A (en) | Amount of extrusion-controlling apparatus for inflation film manufacturing machine | |
| JPH07276473A (en) | Control device for extrusion molding machine | |
| JPH1080947A (en) | Film thickness control device for inflation molding process |