WO2022210205A1 - インフレーション成形装置 - Google Patents
インフレーション成形装置 Download PDFInfo
- Publication number
- WO2022210205A1 WO2022210205A1 PCT/JP2022/013698 JP2022013698W WO2022210205A1 WO 2022210205 A1 WO2022210205 A1 WO 2022210205A1 JP 2022013698 W JP2022013698 W JP 2022013698W WO 2022210205 A1 WO2022210205 A1 WO 2022210205A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- bubble
- viscosity
- temperature
- unit
- stress
- Prior art date
Links
- 238000000465 moulding Methods 0.000 title claims abstract description 59
- 239000012778 molding material Substances 0.000 abstract description 22
- 238000001514 detection method Methods 0.000 description 24
- 239000010408 film Substances 0.000 description 24
- 239000003570 air Substances 0.000 description 22
- 238000001816 cooling Methods 0.000 description 20
- 238000004088 simulation Methods 0.000 description 16
- 230000004048 modification Effects 0.000 description 8
- 238000012986 modification Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 6
- 239000000155 melt Substances 0.000 description 6
- 238000001125 extrusion Methods 0.000 description 5
- 238000000034 method Methods 0.000 description 5
- 238000004891 communication Methods 0.000 description 4
- 230000014509 gene expression Effects 0.000 description 3
- 238000004364 calculation method Methods 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 239000000470 constituent Substances 0.000 description 2
- 239000012080 ambient air Substances 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
Images
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
- 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
- B29C48/03—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
-
- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/32—Extrusion nozzles or dies with annular openings, e.g. for forming tubular 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
- B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
- B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
- B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
-
- 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
- B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
- B29C55/28—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of blown tubular films, e.g. by inflation
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/02—Constructional details
- G01J5/08—Optical arrangements
- G01J5/0859—Sighting arrangements, e.g. cameras
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/48—Thermography; Techniques using wholly visual means
- G01J5/485—Temperature profile
-
- 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
- B29C2948/92019—Pressure
-
- 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
-
- 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
- B29C2948/922—Viscosity; Melt flow index [MFI]; Molecular 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
- B29C2948/92009—Measured parameter
- B29C2948/92209—Temperature
-
- 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
- B29C2948/92447—Moulded article
-
- 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
- B29C2948/926—Flow or feed rate
-
- 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
- B29C2948/92657—Volume or quantity
-
- 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
- B29C2948/92695—Viscosity; Melt flow index [MFI]; Molecular 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
- B29C2948/92504—Controlled parameter
- B29C2948/92704—Temperature
-
- 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
- B29C2948/92971—Fluids, e.g. for temperature control or of environment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2023/00—Tubular articles
Definitions
- the present invention relates to inflation molding equipment.
- the present invention has been made in such a situation, and one of the exemplary purposes of certain aspects thereof is to provide an inflation molding apparatus with enhanced commercial value.
- an inflation molding apparatus includes a viscosity estimating unit that estimates the viscosity of a molding material that is cylindrically discharged from a die, and a temperature specifying unit that specifies the temperature of the molding material. and a parameter estimation unit for estimating a viscosity parameter of the molding material based on the viscosity estimated by the viscosity estimation and the temperature detected by the temperature detection unit.
- Another aspect of the present invention is also an inflation molding device.
- This device includes a stress estimating unit for estimating the stress distribution of the molding material cylindrically discharged from the die, and a viscosity estimating unit for estimating the viscosity distribution of the molding material based on the stress distribution estimated by the stress estimating unit. , provided.
- FIG. 2 is a block diagram schematically showing the functions and configuration of the control device of FIG. 1;
- FIG. It is a figure explaining various variables about a bubble.
- FIG. It is a figure which shows a simulation screen.
- This embodiment is an inflation molding device. Before specifically describing this embodiment, problems to be solved by this embodiment will be described.
- the film may break, for example, due to the change in the molding conditions. If the film is broken, the inflation molding device must be restarted, resulting in reduced work efficiency. Moreover, the molding material is also wasted. Therefore, we want to simulate the case where the molding conditions are changed.
- conventional inflation molding equipment can only estimate the average stress occurring in the bubble. Even if the average stress generated in the bubble is less than the rupture threshold, the bubble will naturally rupture if, for example, the highest stress (hereinafter also referred to as maximum stress) generated in the bubble exceeds the rupture threshold. In other words, if only the average stress can be estimated, it is not possible to predict fracture with high accuracy. Therefore, we want to estimate the distribution of stress occurring in the bubble.
- FIG. 1 is a diagram showing a schematic configuration of an inflation molding apparatus 100 according to an embodiment.
- the inflation molding apparatus 100 includes a die 102, a cooling section 104, a pair of guide sections 106, a take-up machine 108, a winder 110, a pressure detection section 112, a temperature detection section 114, and air supply means 116. , and a controller 120 .
- the direction along the circumference of a circle centered on the central axis C on a plane perpendicular to the central axis C is defined as the circumferential direction.
- a molten molding material is discharged in a cylindrical shape from a ring-shaped discharge port 102 a formed in the die 102 .
- air is ejected at appropriate timing from an air outlet 102b formed in the center of the die 102, and a cylindrically inflated thin film (hereinafter referred to as a "bubble film”) is formed. ”) is molded.
- the cooling part 104 is arranged above the die 102 .
- the cooling unit 104 cools the bubbles by blowing cooling air onto the bubbles.
- a pair of guide portions 106 are arranged above the cooling portion 104 .
- a pair of guides 106 guide the bubble to take-up machine 108 .
- the take-up device 108 is arranged above the guide section 106 .
- Take-off machine 108 includes a pair of pinch rolls 118 .
- a pair of pinch rolls 118 are driven by a motor (not shown) to rotate and pull up the guided bubble to flatly fold it.
- Winder 110 winds the folded film to form film roll body 111 .
- the temperature detection unit 114 detects the temperature distribution on the bubble surface.
- the temperature detection unit 114 is an infrared camera such as a thermography that detects temperature distribution.
- the temperature detection unit 114 is not limited to an infrared camera, and may be, for example, a non-contact temperature sensor that detects the temperature of a spot (point).
- the temperature distribution on the surface of the bubble may be detected by mounting the temperature detection unit 114 on, for example, a robot arm and detecting the temperature of the surface of the bubble while moving around the bubble.
- Temperature detection unit 114 transmits the detection result to control device 120 .
- the air supply means 116 feeds ambient air into the air supply path 102c and blows it out from the air outlet 102b. That is, the air supply means 116 supplies air into the bubble.
- the pressure detection unit 112 detects the pressure inside the air supply path 102c. Note that the pressure detection unit 112 may be provided inside the bubble. The pressure detection unit 112 transmits detection results to the control device 120 .
- the control device 120 is a device that controls the inflation molding device 100 in an integrated manner.
- the control device 120 estimates the viscosity distribution of the molding material, or estimates the viscosity parameter in the viscosity model formula of the molding material, based on data acquired during film molding.
- FIG. 2 is a block diagram schematically showing the functions and configuration of the control device 120. As shown in FIG. Each block shown here can be implemented in terms of hardware by elements such as the CPU of a computer or a mechanical device, and in terms of software is implemented by a computer program or the like. It depicts functional blocks that Therefore, those skilled in the art will understand that these functional blocks can be realized in various ways by combining hardware and software.
- FIG. 3 is a diagram explaining various variables related to bubbles.
- the lower drawing in FIG. 3 is a cross-sectional view of the bubble cut along a plane including the central axis C
- the upper drawing is a cross-sectional view of the bubble cut along a horizontal plane.
- x is the bubble height.
- the bubble height is the height with the upper surface of the die 102 as a reference plane, and can also be said to be the distance in the vertical direction from the upper surface of the die 102 . Reference is made to FIG. 3 in addition to FIG.
- the control device 120 includes a communication unit 130 that executes communication processing with the temperature detection unit 114 and the pressure detection unit 112 according to various communication protocols, and a U/ I section 132, data processing section 134 that executes various data processing based on data acquired from communication section 130 and U/I section 132, and data referenced and updated by data processing section 134 is stored. and a storage unit 136 to store data.
- the data processing unit 134 includes a receiving unit 140, a strain rate calculating unit 141, a bubble shape acquiring unit 142, an internal/external pressure difference identifying unit 143, a viscosity estimating unit 144, a temperature identifying unit 145, and a parameter estimating unit 146. , a simulation unit 147 , an output processing unit 148 , and a stress estimation unit 149 .
- the receiving unit 140 receives bubble surface temperature data from the temperature detecting unit 114 .
- the receiver 140 also receives the pressure data inside the bubble from the pressure detector 112 .
- the bubble shape acquisition unit 142 acquires bubble shape data.
- the bubble shape acquisition unit 142 acquires bubble shape data by analyzing the image of the temperature distribution on the surface of the bubble detected by the temperature detection unit 114 .
- the bubble shape acquisition unit 142 may acquire bubble shape data by analyzing a visible light image of a bubble captured by a visible light camera.
- the bubble shape data acquired by the bubble shape acquiring unit 142 includes the bubble radius R at each bubble height x , the curvature radius r1 in the height direction of the bubble surface, and the curvature radius r2 orthogonal to the curvature radius r1. included.
- the curvature radii r 1 and r 2 correspond to the curvature radii represented by the following equations (1) and (2), respectively.
- the strain rate calculator 141 calculates the bubble strain rate at each bubble height x. Specifically, the strain rate calculator 141 calculates the flow direction strain rate ( ⁇ 1 dot), the radial strain rate ( ⁇ 2 dots), and the film thickness direction strain rate ( ⁇ 3 dots) at each bubble height x. .
- the strain rates ⁇ 1 dot, ⁇ 2 dots, and ⁇ 3 dots are calculated by the following equations (3) to (5), respectively.
- the film moving speed v is represented by a trigonometric function with the bubble height as the horizontal axis, takes the lowest value immediately after exiting the discharge port 102a, and takes the highest value when reaching the take-up device 108.
- the film moving speed at the ejection port 102a can be calculated based on the extrusion rate (mass flow rate) of the molding material, the melt density of the molding material, the radius R 0 of the ejection port 102a, and the lip width (width of the ejection port 102a) H 0 .
- the film moving speed in the take-up device 108 is equal to the take-up speed at which the take-up device 108 takes (pulls) the film, and can be determined by detecting the number of rotations of the motor driving the pair of pinch rolls 118 .
- the method for estimating (identifying) the film moving speed v at each bubble height x is not limited to this, and may be estimated (identified) by other known methods.
- the internal/external pressure difference specifying unit 143 specifies the internal/external pressure difference ⁇ P(x) at each bubble height x, that is, the distribution of the internal/external pressure difference, represented by the following equation (6).
- ⁇ P(x) P in (x) ⁇ P out (x) (6) here, P in (x): bubble internal pressure at bubble height x P out (x): cooling air pressure at bubble height x.
- the internal/external pressure difference identification unit 143 considers the pressure detected by the pressure detection unit 112 and the height difference between the detection position of the pressure detection unit 112 and the bubble height x, and calculates the internal pressure P in ( x) is identified.
- the cooling wind pressure P out (x) may be determined based on a cooling wind simulation, or may be detected using a pressure gauge.
- the internal pressure P in (x) and the cooling air pressure P out (x) essentially depend on the bubble height x, they may be constant regardless of the bubble height x.
- the internal pressure P in may be the pressure detected by the pressure detection unit 112 or a pressure based thereon.
- the stress estimator 149 estimates the stress at each bubble height, that is, the stress distribution, based on a known relational expression relating to the stress occurring in the bubble and the pressure difference ⁇ P between the inside and outside of the bubble. Note that the stress is assumed to be uniform in the circumferential direction.
- the viscosity estimator 144 estimates the viscosity ⁇ (x) at each bubble height x, that is, the viscosity distribution in the height direction.
- the viscosity estimator 144 is based on various known relational expressions, the curvature radius r 1 and the curvature radius r 2 at each bubble height x acquired by the bubble shape acquirer 142, and the stress estimated by the stress estimator 149. to estimate. It is assumed that the viscosity of the bubble is uniform in the circumferential direction.
- the temperature specifying unit 145 specifies the temperature of each bubble height x.
- the temperature identification unit 145 may identify the temperature of each bubble height x from the temperature distribution detected by the temperature detection unit. For example, assuming that the bubble temperature is uniform in the circumferential direction, the temperature of each bubble height x at a certain circumferential position may be the temperature of each bubble height.
- the temperature identifying unit 145 may identify the temperature of each bubble height x from the temperature of the die 102 . The longer the molding material has been discharged, the higher the bubbles are cooled. Taking this into account, the temperature identifying unit 145 may identify the temperature of each bubble height x from the temperature of the die 102 .
- a parameter estimator 146 estimates the viscosity parameter of the molding material.
- the viscosity parameters are parameters k 0 , A, B, C, m (mass flow rate), C1, C2, T ref (reference temperature) in the viscosity model formula represented by the following formula (7). here, T: bubble temperature.
- T bubble temperature.
- the strain rate ⁇ dot and the strain ⁇ are calculated by the following equations (8) and (9).
- the parameter estimator 146 estimates viscosity parameters by fitting the viscosity model equation represented by Equation (7) to the viscosity distribution estimated by the viscosity estimator 144 .
- the simulation unit 147 executes a simulation using the estimated viscosity parameters.
- the simulation unit 147 receives the molding conditions as input and calculates the bubble shape and stress.
- the molding conditions include, for example, extrusion rate of molding material, take-up speed, blow ratio, die temperature, and cooling air volume.
- the simulation unit 147 may execute a simulation using the current molding conditions during molding as input. If the current molding conditions during molding are input, it can be determined whether or not there is a possibility that the bubble during molding will break. If there is a possibility that the bubble will burst, the user may be notified of this by means of a screen display, sound, or other means. At this time, the simulation unit 147 may calculate and present molding conditions under which a high-quality film can be molded without the possibility of breakage. Alternatively, the molding conditions may be changed automatically.
- the simulation unit 147 may input molding conditions to be changed and calculate the bubble shape and stress when the molding conditions are changed. In this case, for example, it is known whether or not there is a possibility of breakage by changing the molding conditions.
- the output processing unit 148 displays various screens on a predetermined display.
- the various screens may be, for example, screens showing the stress distribution of the bubbles during molding estimated by the stress estimation unit 149, or, for example, screens showing viscosity parameters of the bubbles during molding estimated by the parameter estimation unit 146. Alternatively, it may be, for example, a diagram showing a screen related to simulation.
- the output processing unit 148 may print using a predetermined printer or send an e-mail to a predetermined e-mail address as output processing.
- FIG. 4 is a diagram showing a simulation screen.
- the simulation screen includes a molding condition column 150 , a calculation result column 160 and a viscosity parameter column 170 .
- the molding condition column 150 includes an extrusion amount column 151 , a take-up speed column 152 , a blow ratio column 153 , a die temperature column 154 and a cooling air volume column 155 .
- the extrusion rate (Kg/h) of the molding material is entered in the extrusion rate column 151 .
- a take-up speed (m/min) by the take-up machine 108 is entered in the take-up speed column 152 .
- a blow ratio is entered in the blow ratio column 153 .
- the set temperature of the die is entered in the die temperature column 154 .
- the cooling air volume (m 3 /min) from the cooling unit 104 is entered in the cooling air volume column 155 .
- Viscosity parameters k 0 , A, B, C, m, C1, C2, and T ref estimated by the parameter estimation unit 146 are displayed in the viscosity parameter column 170 .
- the simulation unit 147 of the control device 120 receives the molding conditions entered in the molding condition column 150 and uses the viscosity parameters displayed in the viscosity parameter column 170 to calculate the bubble shape and stress.
- the calculation result column 160 includes a maximum stress column 161, a melt tension column 162, a moldability column 163, and a shape display column 164.
- the maximum stress column 161 displays the calculated maximum stress.
- the melt tension column 162 displays the calculated melt tension.
- the melt tension column 162 is the force acting on the molten molding material in the direction of film travel.
- the propriety of molding is displayed in the propriety of molding column 163 .
- the shape display field 164 shows the bubble shape.
- the color of the bubble displayed in the shape display field 164 may be changed according to information regarding the bubble, such as the radius of the bubble and the stress occurring in the bubble. For example, as in the illustrated example, the bubbles may be displayed in a light color where the radius is small and a dark color where the radius of the bubble is large. Further, for example, bubbles may be displayed in a light color where the generated stress is small and in a dark color where the generated stress is large.
- the bubble breaks when the maximum stress exceeds a predetermined threshold. Therefore, by referring to the maximum stress column 161, it is possible to confirm whether or not the bubble will break, and if it is estimated that the bubble will break, how much the threshold is exceeded.
- melt tension column 162 it is possible to confirm whether or not the bubble is taut, that is, whether it can be molded, and how much below the threshold when it is estimated that the bubble cannot be molded.
- the bubble shape acquisition unit 142 acquires bubble shape data at each bubble height x based on the image of the temperature distribution on the surface of the bubble.
- the strain rate calculator 141 calculates strain rates ⁇ 1 dot, ⁇ 2 dots, and ⁇ 3 dots at each bubble height x.
- the internal/external pressure difference identification unit 143 identifies the internal/external pressure difference of the bubble at each bubble height x.
- the stress estimator 149 estimates the stress generated in the bubble at each bubble height x based on the pressure difference between the inside and outside of the bubble.
- the viscosity estimation unit 144 calculates the viscosity of the bubble at each bubble height x, that is, the viscosity distribution of the bubble. to estimate (6)
- the temperature specifying unit 145 specifies the temperature of each bubble height x based on the image of the temperature distribution on the surface of the bubble.
- the parameter estimator 146 estimates the bubble viscosity parameter based on the bubble viscosity distribution and the bubble temperature.
- the simulation unit 147 performs simulation using the estimated viscosity parameter. Note that this processing order is merely an example, and as long as there is no contradiction, the processing order may be changed, or some processing may be executed in parallel with other processing.
- the stress occurring in the bubble is estimated based on the pressure difference ⁇ P between the inside and outside of the bubble.
- the estimation error is smaller than when the stress is estimated based on the torque of the motor that drives the pinch rolls 118 . That is, a more accurate stress distribution is estimated.
- the bubble will naturally rupture. That is, more accurate prediction of fracture becomes possible by estimating the maximum stress more accurately.
- the stress distribution of the bubbles is estimated, and based on this, the viscosity distribution of the bubbles is estimated.
- the estimated viscosity distribution can be used to adjust molding conditions. For example, if the quality of the film being molded is poor, compare the current viscosity distribution with the viscosity distribution when the film was of good quality. It can be seen that the adjustment of
- the viscosity parameter of the molding material can be estimated, and the shape and stress of the bubble can be calculated by inputting the molding conditions.
- the stress occurring in the bubble is estimated based on the pressure difference ⁇ P between the inside and outside of the bubble.
- the estimation error is smaller than when the stress is estimated based on the torque of the motor that drives the pinch rolls 118 .
- Modification 1 In the embodiment, the stress generated in the bubble, the viscosity of the bubble, the bubble temperature, etc. are assumed to be uniform in the circumferential direction. can be estimated.
- the stress estimator 149 may estimate the stress based on the torque of the motor that drives the pinch roll 118 instead of the internal/external pressure difference ⁇ P.
- the viscosity estimator 144 may estimate the viscosity
- the parameter estimator 146 may estimate the viscosity parameter, assuming that the stress is uniformly applied to the valve in the height direction. In this case, the viscosity distribution of the bubble cannot be estimated, but the viscosity parameter of the bubble is the value when the stress estimated based on the take-up speed is uniformly generated in the bubble in the height direction. can be estimated.
- the parameter estimator 146 may estimate the viscosity parameter assuming that the temperature of the bubble is uniform in the height direction.
- the temperature detection unit 114 may be a non-contact temperature sensor that detects the temperature of the spot (point).
- the uniform bubble temperature may be estimated based on the die 102 temperature. In this case, the temperature detection section 114 becomes unnecessary.
- the bubble shape acquisition unit 142 may acquire bubble shape data by, for example, analyzing a visible light image of a bubble captured by a visible light camera.
- the bubble shape obtaining unit 142 obtains the shape data of the bubble from the visible light image, the viscosity distribution of the valve can be estimated. Since the temperature of the bubble is not necessary, the temperature detection unit 114 is not necessary for estimating the viscosity distribution of the bubble.
- the present invention relates to inflation molding equipment.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Manufacturing & Machinery (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Massaging Devices (AREA)
- Formation And Processing Of Food Products (AREA)
- Moulding By Coating Moulds (AREA)
- Prostheses (AREA)
Abstract
Description
ΔP(x)=Pin(x)-Pout(x) ・・・(6)
ここで、
Pin(x):バブル高さxにおけるバブルの内圧
Pout(x):バブル高さxにおける冷却風圧
である。
T:バブルの温度
である。
また、ひずみ速度εドット、ひずみεは、以下の式(8)、(9)で算出される。
(1)バブル形状取得部142は、バブル表面の温度分布の画像に基づいて、各バブル高さxにおけるバブルの形状データを取得する。
(2)ひずみ速度算出部141は、各バブル高さxにおけるひずみ速度ε1ドット,ε2ドット,ε3ドットを算出する。
(3)内外圧力差特定部143は、各バブル高さxにおけるバブルの内外圧力差を特定する。
(4)応力推定部149は、バブルの内外圧力差に基づいて、各バブル高さxにおいてバブルに生じている応力を推定する。
(5)粘度推定部144は、バブル形状取得部142が取得したバブルの形状データと、応力推定部149が推定した応力に基づいて、各バブル高さxにおけるバブルの粘度、すなわちバブルの粘度分布を推定する。
(6)温度特定部145は、バブル表面の温度分布の画像に基づいて、バブルの各バブル高さxの温度を特定する。
(7)パラメータ推定部146は、バブルの粘度分布と、バブルの温度に基づいて、バブルの粘度パラメータを推定する。
(8)シミュレーション部147は、推定された粘度パラメータを用いて、シミュレーションを実行する。
なお、この処理順序はあくまでも一例であり、矛盾しない限りにおいて、処理の順序を入れ替えたり、一部の処理を他の処理と並列に実行したりしてもよい。
実施の形態では、バブルに生じる応力、バブルの粘度、バブル温度などが周方向には一様であるものとしたが、これらは周方向に一様ではないものとして、周方向の各位置におけるこれらの値を推定してもよい。
実施の形態とは異なり、応力推定部149が内外圧力差ΔPの代わりに、ピンチロール118を駆動するモータのトルクに基づいて応力を推定してもよい。そして、その応力が高さ方向に一様にバルブに生じているものとして、粘度推定部144が粘度を推定し、パラメータ推定部146が粘度パラメータを推定してもよい。この場合、バブルの粘度分布は推定できないが、バブルの粘度パラメータについては、引取速度に基づいて推定された応力が高さ方向に一様にバブルに生じているとした場合の値ではあるが、推定できる。
実施の形態とは異なり、バブルの温度は高さ方向に一様であるものとして、パラメータ推定部146が粘度パラメータを推定してもよい。この場合、温度検出部114は、スポット(点)の温度を検出する非接触式の温度センサで足りる。あるいは、ダイ102の温度に基づいて一様なバブルの温度を推定してもよい。この場合、温度検出部114は不要となる。バブル形状取得部142は、例えば可視光カメラが撮影したバブルの可視光画像を解析することによりバブルの形状データを取得すればよい。また、例えばバブル形状取得部142が可視光画像からバブルの形状データを取得するなど、バブル表面の温度分布の画像を用いない方法でバブルの形状を取得すれば、バルブの粘度分布を推定するのにバブルの温度は不要であるため、バブルの粘度分布を推定するにあたって温度検出部114は不要である。
Claims (4)
- ダイから円筒状に吐出されたバブルの粘度を推定する粘度推定部と、
バブルの温度を特定する温度特定部と、
前記粘度推定部により推定されたバブルの粘度と前記温度特定部により検出されたバブルの温度に基づいて、バブルの粘度パラメータを推定するパラメータ推定部と、
を備えるインフレーション成形装置。 - バブルの温度分布画像を取得する赤外線カメラを備え、
前記粘度推定部は、前記赤外線カメラが取得したバブルの温度分布画像に基づいて特定したバブルの形状を用いてバブルの粘度を推定し、
前記温度特定部は、前記赤外線カメラが取得したバブルの温度分布画像に基づいてバブルの温度を特定する請求項1に記載のインフレーション成形装置。 - ダイから円筒状に吐出されたバブルの応力分布を推定する応力推定部と、
前記応力推定部により推定されたバブルの応力分布に基づいて、バブルの粘度分布を推定する粘度推定部と、
を備えるインフレーション成形装置。 - 応力推定部は、圧力分布に基づいて、応力分布を推定する請求項3に記載のインフレーション成形装置。
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020237023662A KR20230162920A (ko) | 2021-03-31 | 2022-03-23 | 인플레이션성형장치 |
CN202280009105.6A CN116685453A (zh) | 2021-03-31 | 2022-03-23 | 充气成形装置 |
EP22780419.2A EP4316775A1 (en) | 2021-03-31 | 2022-03-23 | Inflation molding device |
US18/336,064 US20230321888A1 (en) | 2021-03-31 | 2023-06-16 | Inflation molding device |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2021060746A JP2022156852A (ja) | 2021-03-31 | 2021-03-31 | インフレーション成形装置 |
JP2021-060746 | 2021-03-31 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US18/336,064 Continuation US20230321888A1 (en) | 2021-03-31 | 2023-06-16 | Inflation molding device |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2022210205A1 true WO2022210205A1 (ja) | 2022-10-06 |
Family
ID=83456803
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2022/013698 WO2022210205A1 (ja) | 2021-03-31 | 2022-03-23 | インフレーション成形装置 |
Country Status (7)
Country | Link |
---|---|
US (1) | US20230321888A1 (ja) |
EP (1) | EP4316775A1 (ja) |
JP (1) | JP2022156852A (ja) |
KR (1) | KR20230162920A (ja) |
CN (1) | CN116685453A (ja) |
TW (1) | TWI807737B (ja) |
WO (1) | WO2022210205A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024079333A1 (de) * | 2022-10-14 | 2024-04-18 | Windmöller & Hölscher Kg | Folienextrusionsmaschine und verfahren zur herstellung einer kunststofffolie |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN117818012B (zh) * | 2024-03-06 | 2024-05-17 | 江苏沃能电气科技有限公司 | 一种护套热缩管挤出扩张成型控制系统 |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11192660A (ja) * | 1997-10-28 | 1999-07-21 | Ube Ind Ltd | 成形シミュレーション計算装置およびプログラム記録媒体 |
JP2017177348A (ja) | 2016-03-28 | 2017-10-05 | 住友重機械モダン株式会社 | フィルム成形装置 |
JP2020157655A (ja) * | 2019-03-27 | 2020-10-01 | 住友重機械工業株式会社 | インフレーション成形装置 |
JP2020163623A (ja) * | 2019-03-28 | 2020-10-08 | 住友重機械工業株式会社 | インフレーション成形装置 |
-
2021
- 2021-03-31 JP JP2021060746A patent/JP2022156852A/ja active Pending
-
2022
- 2022-03-23 CN CN202280009105.6A patent/CN116685453A/zh active Pending
- 2022-03-23 WO PCT/JP2022/013698 patent/WO2022210205A1/ja active Application Filing
- 2022-03-23 EP EP22780419.2A patent/EP4316775A1/en active Pending
- 2022-03-23 KR KR1020237023662A patent/KR20230162920A/ko unknown
- 2022-03-30 TW TW111112082A patent/TWI807737B/zh active
-
2023
- 2023-06-16 US US18/336,064 patent/US20230321888A1/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH11192660A (ja) * | 1997-10-28 | 1999-07-21 | Ube Ind Ltd | 成形シミュレーション計算装置およびプログラム記録媒体 |
JP2017177348A (ja) | 2016-03-28 | 2017-10-05 | 住友重機械モダン株式会社 | フィルム成形装置 |
JP2020157655A (ja) * | 2019-03-27 | 2020-10-01 | 住友重機械工業株式会社 | インフレーション成形装置 |
JP2020163623A (ja) * | 2019-03-28 | 2020-10-08 | 住友重機械工業株式会社 | インフレーション成形装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2024079333A1 (de) * | 2022-10-14 | 2024-04-18 | Windmöller & Hölscher Kg | Folienextrusionsmaschine und verfahren zur herstellung einer kunststofffolie |
Also Published As
Publication number | Publication date |
---|---|
TWI807737B (zh) | 2023-07-01 |
EP4316775A1 (en) | 2024-02-07 |
JP2022156852A (ja) | 2022-10-14 |
TW202239570A (zh) | 2022-10-16 |
US20230321888A1 (en) | 2023-10-12 |
KR20230162920A (ko) | 2023-11-29 |
CN116685453A (zh) | 2023-09-01 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
WO2022210205A1 (ja) | インフレーション成形装置 | |
EP3715090B1 (en) | Inflation molding device | |
TWI711526B (zh) | 薄膜成形裝置 | |
US11141904B2 (en) | Method for monitoring a film quality and film machine | |
US7751923B2 (en) | Method for control of the thickness of extruded film | |
JP2006305881A (ja) | パリソン肉厚制御回路及びそれを用いた中空成形機の肉厚調整方法 | |
WO2022185623A1 (ja) | 押出装置およびそれに用いられる押出成形用ダイ、監視装置およびプログラム、ストランドの製造方法、ならびに、ストランド径の調整方法 | |
US20240116234A1 (en) | Extrusion device and extrusion method | |
JP6965194B2 (ja) | フィルム成形装置 | |
JP7389561B2 (ja) | インフレーション成形装置 | |
JP7315359B2 (ja) | インフレーション成形装置 | |
JP2023088181A (ja) | フィルム成形装置およびその制御装置 | |
JP7045242B2 (ja) | フィルム成形装置および制御装置 | |
KR102308063B1 (ko) | 블로운 필름의 제조장치 | |
US11390009B2 (en) | Method for the online monitoring of film quality and film machine comprising a device for the online monitoring of film quality | |
KR100783718B1 (ko) | 용수도관 천공장치의 펀치휠 회전속도 제어방법 및 장치 | |
JPH05138733A (ja) | インフレーシヨン成形ラインにおけるフロストライン制御装置 | |
US20060244167A1 (en) | Method and device for control of the thickness of extruded film | |
JP2945749B2 (ja) | フィルムシートのプロファイル制御方法 | |
JP2021160227A (ja) | インフレーション成形装置 | |
JP2020163748A (ja) | インフレーション成形装置 | |
JP2024059219A (ja) | 制御装置、制御方法、プログラム、計測方法、および成形システム、 | |
JP2021070275A (ja) | フィルム成形装置 | |
JP2021070260A (ja) | インフレーション成形装置 | |
JP2004358786A (ja) | 熱可塑性樹脂シートの製造方法および製造装置 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 22780419 Country of ref document: EP Kind code of ref document: A1 |
|
WWE | Wipo information: entry into national phase |
Ref document number: 202280009105.6 Country of ref document: CN |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2022780419 Country of ref document: EP |
|
ENP | Entry into the national phase |
Ref document number: 2022780419 Country of ref document: EP Effective date: 20231031 |
|
NENP | Non-entry into the national phase |
Ref country code: DE |