DE102007012802A1 - Inflation device exhibits ring form for forming tube foil, pressure roll for folding the tube foil, rotary section for turning the ring form and/or the roll, sensors for measuring characteristic value of the foil, and calculation section - Google Patents

Abstract

The inflation device exhibits a ring form (2) for forming a tube foil, pressure roll (5) for folding the tube foil, a rotary section for turning the ring form and/or the pressure roll, a first sensor (16) and a second sensor (16) for measuring of characteristic value of the tube foil, that is turned by the rotary section and is folded, and a calculation section (12) for a thickness profile of the tube foil and the information of the positions in which the tube foil is folded. The rotary sections turn the ring form and/or the pressure roll in a direction around a given angle. The inflation device exhibits a ring form (2) for forming a tube foil, pressure roll (5) for folding the tube foil, a rotary section for turning the ring form and/or the pressure roll, a first sensor (16) and a second sensor (16) for measuring of characteristic value of the tube foil, that is turned by the rotary section and is folded, and a calculation section (12) for a thickness profile of the tube foil and the information of the positions in which the tube foil is folded. The rotary sections turn the ring form and/or the pressure roll in a direction around a given angle and then turn the ring form and/or the pressure roll in other direction. The first sensor and the second sensor are intended at both end section of the folded tube foil. Areas that are measured by the sensors, are edge section of the folded tube foil. The device further shows a control unit (20) for controlling a quantity of a raw material of the tube foil. The raw material is discharged from of a nozzle on the basis of a control signal that is sent wirelessly from a computer, which is separated by the device and which produces the control signal on the basis of the calculated profile.

Description

inflation

These Registration claims foreign priority based on Japanese Patent Application No. 2006-072507 filed on Mar. 16, 2006, and the contents of which are hereby incorporated by reference in their entirety becomes.

BACKGROUND THE INVENTION

1st area the invention

The The present invention relates to an inflator for forming a hollow tubular film. More specifically, the present invention relates an inflator for forming a uniform tubular film, by giving a characteristic value (for example, the thickness) of the profile the tubular film is measured online.

2. Description of the prior art

JP-A-2004-001379 is a prior art related to inflation.

7 Fig. 14 is a view of a basic arrangement showing an inflator disclosed in JP-A-2004-001379. In 7 is a raw material made of plastics, that of an extruder machine 1 extruded in a cylindrical tubular film 3a through a ring shape 2 educated.

The reference number 4 is an air supply / exhaust device.

This cylindrical tubular film is made by pressure rollers 5 folded. The tubular film 3b , which has been folded into a double foil and flattened, passes through a suitable, fixed roll 6 is conveyed in the direction P and wound by a winding device (not shown).

Around to control that the film thickness of the protruding, cylindrical tubular film becomes uniform, it is necessary to measure the film thickness. The measurement of the thickness not only in the longitudinal direction the tubular film but also in the width direction or width direction the tubular film performed be, that is, the circumferential direction of the cylinder shape.

In order to measure the thickness, a sensor for measuring the thickness is arranged in a predetermined position. In the prior art, the pressure rollers 5 (or the ring shape 2 ) and when the pressure rollers 5 (or the ring shape 2 ) are rotated clockwise by 360 °, virtual zones are formed, which are evenly divided by a predetermined angle (for example, 90 °). In this thickness measuring system, after the pressure rollers 5 (or the ring shape 2 ) clockwise (in the direction of the arrow R) by the predetermined angle 90 ° four times (for example, 360 °) have been rotated, the pressure rollers 5 counterclockwise (in the direction of arrow R ') by the same angle for reverse rotation and back-and-forth motion. In this way, the characteristic value of the tubular film, which is folded in a predetermined position in each zone, is measured by the sensor.

Of the characteristic value (thickness) of the double tubular film is measured by measuring the position in which the property value the tubular film through the sensor in each zone in a given Position S measured in the edge region of the folded tubular film becomes.

In 7 is the reference 10 an oscillation position information section that displays the rotation information of the pressure rollers 5 holds. The reference number 11 is a folding position information section that holds zone information of a virtual zone in which the tubular film is folded according to the rotation information.

The reference number 12 is a calculating section which calculates a property value of the edge portion by means of the zone information and by the calculation in which the measured value Ei of the double tubular film at the edge portion S of the folded tubular film is divided by two. This is how the calculation section performs 12 an estimation calculation to estimate a property value in the circumferential direction. This estimation calculation is performed for all zones. By the statistical processing of this estimation calculation (for example, the mean value), the property value in the circumferential direction of the tubular film becomes 3a calculated.

8th is a view showing a cross section of the cylindrical tubular film 3a shows. This view shows an example in which virtual zones Z1, Z2, Z3 and Z4 are moved by moving the pressure rollers back and forth 5 (or the ring shape 2 ) are formed clockwise (in the direction of the arrow R) and counterclockwise (in the direction of the arrow R ') and by equally dividing a circumference of the tubular film into four parts (The pressure rollers 5 or the ring shape 2 are rotated by 90 °).

After the measurement has been carried out from the zones Z1 to Z4, the pressure rollers are reversely rotated so that the measurement in the sequence is performed from the zone Z4 to the zone Z1. This measurement pattern is repeated periodically and the profile of the property value of each zone can be measured.

In the above-described inflator, since only one sensor for measuring the thickness is provided, it is necessary to repeatedly rotate the pressure rollers 5 through 360 ° by the total width of the tubular film 3a to be able to measure.

Become the pressure rollers are not rotated 360 °, is it impossible to measure the total width. This takes time.

In addition, depending on the type of inflator, the pressure rollers 5 do not turn 360 °, but only rotate through 180 ° or 270 °, for example. In this case, it is impossible to measure the total distance.

OVERVIEW OF THE INVENTION

The The present invention has been made in view of the above circumstances and provides an inflator that provides a high-speed profile and also measure a total width of a tubular film even if the pressure rollers do not rotate 360 °, by providing two sensors at each end portion of the tubular film are.

In some implementations, an inflator of the invention comprises:
a ring mold for forming a tubular film or an inflated film;
Pressure rollers or rollers for folding the tubular film;
a rotary section for rotating the ring mold and / or the pressure rollers;
a first sensor and a second sensor for respectively measuring the property values of the tubular film which is rotated and folded by the rotary section; and
a calculating section for calculating a profile of the tubular film on the basis of the property values measured by the first sensor and the second sensor and information of the positions in which the tubular film is folded.

In the inflator, the rotary section rotates the ring shape and / or the pressure rollers or pressure rollers in one direction by a given angle and then turns in the other way to return.

In the inflator are the first sensor and the second sensor provided at both end portions of the folded tubular film.

In the inflator are areas that are from the first sensor and the second sensor to be measured, edge portions of folded tubular film.

SUMMARY THE DRAWINGS

1 Fig. 10 is an arrangement view showing an embodiment of the inflator of the present invention;

2 Fig. 12 is a schematic diagram showing a relative relationship between the measuring area S1 and the first sensor and between the measuring area S2 and the second sensor in each folded area;

3A and 3B 12 are schematic diagrams for explaining a relationship between each zone and the first sensor and the second sensor by a rotation angle of the turntable;

4 Fig. 11 is a view showing an example of beam control of the raw material;

5 Fig. 10 is an arrangement view showing a schematic of an example of control using wireless communication;

6 Fig. 10 is a block arrangement view showing an example of the control using wireless communication;

7 Fig. 13 is a view of a basic arrangement showing a prior art inflator for producing a tubular film; and

8th is a view showing a cross section of a cylindrical tubular film.

DESCRIPTION THE PREFERRED EMBODIMENTS

Referring to the drawings, the invention will be explained in detail below. 1 Fig. 10 is an arrangement view showing an example of the inflator of the present invention. Like reference numerals will be used for components in FIG 1 which are the same as those of the inflator used in 7 is shown, and an explanation thereof is therefore omitted.

In this embodiment of the present invention, there are positions in which property values of the tubular film in each zone are measured at both end edge portions of the folded tubular film and a characteristic (thickness) of the double tubular film is determined by two sensors measured. After the pressure rollers 5 (or the ring shape 2 ), for example by 270 ° clockwise (in the direction of the arrow R), the pressure rollers become 5 (or the ring shape 2 ) and rotate back counterclockwise (in the direction of arrow R ') by the same angle. Due to this operation, the property values of the tubular film measured in a predetermined position in each zone are measured by the sensors.

Also in this embodiment of the present invention, it is possible, even if the pressure rollers 5 (or the ring shape 2 ), for example, to be rotated by 270 ° to make the same profile as that of the case in which the pressure rollers 5 (or the ring shape 2 ) are rotated 360 °.

In 1 is the reference 10 an oscillation position information section, the rotation information of the pressure rollers 5 holds. The reference number 11 is a folding position information section that holds zone information of the virtual zones in which the tubular film is folded according to the rotation information.

The reference number 12 is a calculating section which calculates property values of the edge portions by means of the zone information and the calculation in which the measured values Ei1 and Ei2 of the double tubular film at the edge portions S1 and S2 of the double tubular film are divided by two. This is how the calculation section performs 12 an estimation calculation to estimate a property value in the circumferential direction. This estimation calculation is performed in zones for 270 °. By the statistical processing (for example, the average value), the property value becomes in the circumferential direction of the tubular film 3a calculated.

2 FIG. 12 is a schematic diagram showing a relative relationship between the measuring area S1 and the first sensor. FIG 16 and between the measuring area S2 and the second sensor 17 in each folded zone shows.

In (A) the sensor leads 16 a property value measurement of the double sheet at the fold edge portion S1 in the central position of the zone Z1. The sensor 17 performs a property value measurement of the double sheet in the fold edge portion S2 in the central portion of the zone Z3.

In (B) the sensor leads 16 by the operation of the rotation of the pressure rollers 5 Counterclockwise, a property value measurement of the double foil at the edge portion S1 of the zone Z2. The sensor 17 performs the property value measurement of the double sheet at the edge portion S2 of the zone Z4.

When next leads the first sensor a property value measurement in zone Z3 and the second Sensor leads a property value measurement in the zone Z1.

As described above, the zones Z1, Z2 and Z3 are detected by the first sensor 16 measured. Zones Z3, Z4 and Z1 are defined by the second sensor 17 measured. Thereafter, when the pressure rollers are reversed, the measurements are performed in order from the zone Z4 to the zone Z1. This measurement pattern is repeated periodically so that a profile measurement of property values can be performed for each zone.

3A and 3B FIG. 12 are schematic diagrams for explaining the above relationships using a rotation angle of the turntable. FIG 15 , In 3A the dotted line "a" is a location of the measuring point 1 of the first sensor 16 , This place is rotated by 270 ° from -90 ° to 180 ° and then vice versa. In 3A the dotted line "b" is a location of the measuring point 2 of the second sensor 17 , This place is rotated by 270 ° from -180 ° to 90 ° and then vice versa. This turning and reversing movement is repeated.

3B shows a state in which a measured value of the Z4 zone, which is a measured value of -90 ° to 0 ° of the dotted line "b", which is the location of the measuring point 2 with respect to the dotted line "a" of the location of the measuring point 1 is, in the place of the measuring point 1 is taken.

As has been described above, if the measurement of the zone, not can be measured by the first sensor, by the result of Measurement is interpolated by the second sensor, although the actual Rotation angle is only 270 °, can the same measurement as that of the case can be obtained in the rotation of the rotation angle is 360 °. Moreover, it is through the Rotation through 270 ° possible, one To get profile in a degree of rotation that is around the angle from 90 ° earlier. In addition, it is possible in zones Z1 and Z3 to obtain the measurement results from to get two sensors. When calculating with mean and smoothing accomplished it is therefore possible to get a more accurate measurement result.

In the above embodiments, the pressure rollers 5 is moved around by the oscillation of the rotating section and reversed such that a plurality of zones is formed. Alternatively, in the above embodiment, the pressure rollers 5 continuously rotating in one direction such that a plurality of Zo NEN is formed. In addition, the side of the ring shape 2 to be turned around. In general, the pressure rollers are rotated so that they move back and forth, and the ring shape is rotated in one direction.

Concerning the property value of the tubular film is generally such that the film thickness, as described in the embodiment, is measured. However, the profile measurement can be done by the same procedure for the Color, formation or permeability or the like as a film property value that does not match the film thickness, carried out become.

What the raw material of the tubular film relates to the present Invention is generally polyolefin, which by polypropylene or polyethylene is used. But as long as Raw material is a material through which a hollow tube passes through the inflation process can be formed, any other Raw material to be used.

In the inflator of 1 , as in 4 is shown, raw material is cylindrically unloaded from a rotary actuator (mold) and formed into a balloon-like shape using air, and the cylindrical object thus formed is laid on the other so as to produce a product.

In this case, when the flow port of the raw material is concerned, a number of nozzles (not shown) or orifices are circular in shape on the ring 2 arranged. In this case, an amount of the raw material discharged from the nozzles is controlled by a control unit provided separately from the device body via a cable line.

In the structure of the prior art, therefore, the ring shape 2 according to the rotation of the pressure rollers 5 rotated and the cable is also moved by the rotation. Accordingly, it is difficult to lay the wiring. As a result, it is difficult to perform profile control.

5 Fig. 13 is a view showing an inflator for solving the above problems. 5 Fig. 10 is an arrangement view showing an overview of an inflator in which a cable wiring is no longer necessary by directly connecting a control unit and a wireless LAN to the ring shape 2 the inflator are provided. In 5 is the reference 20 a flow controller for controlling an amount of the raw material discharged from the flow port of the nozzles. The number of nozzles provided is n. In this case, the control signal is wirelessly from a personal computer 21 which is used for the control output, which is provided separately from the main body of the device.

6 Fig. 13 is a view showing an inflator in which an amount of the raw material discharged from the nozzles is wirelessly controlled on the basis of the profile data. The film thickness detected by at least one sensor becomes the personal computer 21 sent, which is used for the control.

In the personal computer 21 , which is used for the control, measured data are arranged in time series so that the profile data is generated. The profile data becomes the control unit 20 sent and profile control is performed. If a more advanced or improved control unit 22 performs an adaptive control, becomes a position by the rotation of the ring shape 2 twisted, dynamically corrected. An automatic position correction can therefore be realized. This profile data and the corrected position correspondence data become the control unit 20 via a wireless interface 23 Posted.

The control unit 20 performs an output calculation of the PI (proportional-integral) control, a fuzzy control, or a finite-beat control so as to control an amount of the raw material discharged from the flow port of the Nozzle is ejected.

As As described above, the controller can be used without use a wiring performed become. It is therefore possible to realize an inflator that does not have the problem that the cables intervene.

According to the embodiments of the present invention the inflator: the rotary section for rotating the ring shape and / or the pressure rollers; the first sensor and the second sensor for respectively measuring property values of the tubular film, which is rotated by the rotary section and folded; and the calculation section for calculating a profile of the tubular film based on the property values provided by the first sensor and the second sensor, and the information of the Positions in which the tubular film is folded. Accordingly a profile can be displayed at a high speed. It is also possible if the pressure rollers do not rotate 360 °, the total width increases measure up.

In the above explanation of the present The present invention has been explained for the purpose of illustrating an example of the present invention, only a specific embodiment. Accordingly, it should be noted that the present invention is not limited to the above specific embodiment. Variations may be made without departing from the scope of the claim of the present invention.

Claims (5)

Inflator having: a ring shape for forming a tubular film; Pressure rollers for folding the Tubular film; a rotary section for rotating the ring shape and / or the pressure rollers; a first sensor and a second sensor for respectively measuring property values of the tubular film, which is rotated by the rotary section and folded; and one Calculation section for calculating a profile of the tubular film based on the property values provided by the first sensor and the second sensor, and the information of the Positions in which the tubular film is folded. An inflator according to claim 1, wherein the rotary portion the ring shape and / or the pressure rollers in one direction around a rotates predetermined angle and then turns in the other direction, to return. An inflator according to claim 1 or 2, wherein the first sensor and the second sensor at both end portions the folded tubular film are provided. Inflator according to one of claims 1 to 3, wherein regions passing through the first sensor and the second sensor to be measured, edge portions of the folded tubular film are. The inflator of claim 1, further having: a control unit for controlling an amount of a raw material the tubular film, which flow from the outflow ports of a nozzle on the base of a control signal sent wirelessly from a computer becomes, wherein the computer is separate from the inflator is provided and the control signal on the basis of the calculated Profiles generated.