JP2003192203A - Method for determining film roll quality and its device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To determine film roll quality by accurately measuring thickness of a film web after extension in a short time and to provide a method for determining quality of a slit roll obtained by slitting the film web of the film roll and efficiently manufacturing the slit roll. <P>SOLUTION: Thickness of the film web MR after extension is measured at a plurality of predetermined positions in the width direction of the film web MR and for inspection as time goes by in the longitudinal direction of the film web MR, and the measured thickness data of the film web MR are totalized at the respective predetermined positions in the width direction of the film web MR, and thereby, thickness data at the predetermined positions in the width direction of the film web MR of the film roll formed by winding up the film web MR are provided. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film roll quality determination method and apparatus, and more particularly to a method and apparatus for determining the quality of a film roll by measuring the thickness of an original film after stretching. Furthermore, the present invention relates to a method for determining the quality of a slit roll obtained by slitting a raw film of the film roll and a method for manufacturing the slit roll.

[0002]

2. Description of the Related Art Conventionally, when there is unevenness in thickness in a width direction of a slit film obtained by slitting a film roll rewound from a film roll obtained in a production machine, as shown in FIG. A bump-shaped bulge 11 is formed on the surface of the slit roll 1 on which the slit film is wound.

As described above, when the slit roll 1 having the uneven thickness in the width direction of the slit film and having the bump-like bulge 11 formed on the surface is rewound and used by the user, such as a film processor, There is a problem that wrinkles and slacks are generated in the portion where the bulge 11 is formed or in the vicinity thereof, resulting in defective bag making, and in particular, when a printing process is performed, printing deviation occurs.

Therefore, it is required that the slit roll 1 having the bump-like bulge 11 formed on the surface is discarded or used for an application that does not pass through the printing process.

In order to cope with this demand, it is necessary to inspect the slit film for the presence or absence of thickness unevenness in the width direction. Conventionally, in order to inspect this, the film original obtained by the production machine is used. The surface hardness of the film roll wound up with the film roll (including the film roll up to the wide film before slitting into the final slit film) and the slit roll wound up with this slit film was measured by a hardness tester. The quality of the film roll or the slit roll is determined by measuring the width of the slit film in the width direction of the roll, and indirectly, the presence or absence of thickness unevenness in the width direction of the slit film is inspected. Incidentally, the measurement of the surface hardness of the film roll and the slit roll, specifically, the slit roll wound while unwinding the film roll from the film roll is placed on a horizontal table, the hardness meter To measure the surface hardness of the slit roll. At this time, as the hardness meter, a predetermined instrument that plays a role of a weight is attached, and the hardness is measured from one end of the slit roll, for example, at a position of 20 mm, in the width direction of the slit roll at intervals of 50 mm. . In the measurement, the measurement tip of the hardness tester was brought into vertical contact with the highest position of a slit roll placed on a horizontal table, and the numerical values indicated by the hardness tester were read sequentially.

In evaluating the quality of the film roll or slit roll, if there is unevenness in the width direction of the film forming the film roll or slit roll, a bump-like bulge is formed on the surface of the roll.
Along with this, paying attention to the fact that the surface hardness of the roll fluctuates, calculate the absolute value of the difference between the maximum value and the minimum value of the above-mentioned measured values by the hardness meter, and the winding thickness of the film roll or slit roll, etc. According to the above, it was compared with a predetermined reference value, and it was judged whether or not it was within this reference value, and the evaluation was performed.

[0007]

However, this method of judging the quality of a film roll or slit roll cannot be measured and judged until the film has been wound up on the roll, and the measurement itself takes time. It is necessary to measure the surface hardness of the roll and indirectly inspect the presence or absence of thickness unevenness in the width direction of the slit film. There is a problem in that the accuracy and reliability of the inspection are low, coupled with the fact that the error in the test is likely to be added.

In view of the problems of the above-described method for determining the quality of a film roll or slit roll, which has been conventionally used for inspecting the slit film for the presence or absence of thickness unevenness in the width direction, the present invention provides The thickness of the original film,
In a short time, by accurately measuring, the quality of the film roll is determined, and further, the quality of the slit roll obtained by slitting the film roll of this film roll is determined, and the slit roll is efficiently used. It is an object to provide a method and a device that can be manufactured.

[0009]

In order to achieve the above object, a method for determining the quality of a film roll according to the present invention is to measure the thickness of a stretched film original at a plurality of predetermined positions in the width direction of the original film. Further, the film raw fabric is wound by measuring the longitudinal direction of the film raw fabric with time and integrating the measured thickness data of the film raw fabric for each predetermined plural positions in the width direction of the film raw fabric. It is characterized in that the thickness data of a plurality of predetermined positions in the width direction of the film original roll of the taken film roll is obtained.

This quality determination method for a film roll is performed by directly measuring the thickness of the stretched film roll to determine a plurality of predetermined positions in the width direction of the film roll on which the film roll is wound. Since the thickness data is obtained, it is possible to automatically and accurately determine the quality of the film roll when the winding of the roll is completed, in a short time and without human error.

Then, based on the thickness data at a plurality of predetermined positions in the width direction of the film roll of the film roll obtained by the above-described method for determining the quality of the film roll, the film roll of the film roll is slit and obtained. The quality of the slit roll can be determined.

As a result, when the winding of the roll of the film roll is completed, the quality of the slit roll obtained from the film roll can be automatically and accurately determined in a short time with no human error.

In this case, the quality of the slit roll can be determined based on the standard deviation of the thickness data and the pattern coefficient represented by the following equation. Pattern coefficient = (maximum thickness-average thickness) / (average thickness-minimum thickness)

Further, the quality of the slit roll can be judged based on the standard deviation of the thickness data and the coefficient of variation represented by the following equation (2). Coefficient of variation = ((maximum thickness-minimum thickness) / average thickness) x 100

Further, slits obtained by slitting the film roll of the film roll on the basis of the thickness data at a plurality of predetermined positions in the width direction of the film roll of the film roll obtained by the above-mentioned film roll quality judging method. It is possible to select a position in the width direction of the film roll of the film roll of the roll.

As a result, it is possible to surely obtain the slit rolls that meet the required quality, reduce the slit rolls to be discarded, and improve the product yield.

Further, a film roll quality judging device of the present invention for carrying out the above film roll quality judging method,
A film raw material thickness measuring device for measuring the thickness of the stretched film original fabric at a plurality of predetermined positions in the width direction of the film original fabric while moving in the width direction of the film original fabric, and the film original fabric. Storage means for storing the thickness data of the film original fabric measured in the longitudinal direction of the film original fabric with the thickness measuring device, and the thickness data of the film original fabric stored in the storage means. Computation means for calculating the thickness data of a predetermined plurality of positions in the width direction of the film roll of the film roll wound with the film roll by accumulating at each of a plurality of predetermined positions in the width direction of the roll It is characterized by

The film roll quality determination device measures the thickness of the stretched film original in a plurality of predetermined positions in the width direction of the original film while moving in the width direction of the original film. Since the thickness of the film roll is measured using an anti-thickness measuring instrument, the thickness data at multiple predetermined positions in the width direction of the film roll of the film roll can be accurately measured by a simple mechanism. Can be obtained.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, a method and apparatus for determining the quality of a film roll according to the present invention, and further a method and a method for determining the quality of a slit roll obtained by slitting a film material roll of this film roll. An embodiment of a method for manufacturing a slit roll will be described.

Therefore, first, a film roll quality determination method and apparatus according to the present invention will be described.

This film roll quality judging method and its apparatus judge the quality of the film roll obtained by the production machine or the film roll of the film roll which is a wide film before slitting into the slit film. It is about the method.

First, as shown in FIG. 2, the thickness of the stretched original film MR is set at a plurality of predetermined positions in the width direction of the original film MR and the flow of the original film MR (film formation).
In accordance with the above, the longitudinal direction of the original film MR is measured with time. Note that FIG. 2 schematically shows this measuring method, in which a slit film SR obtained by slitting the original film MR is 1 in the width direction of the original film MR.
It goes without saying that it does not indicate that only one can be taken.

Specifically, this measurement is performed by melt-extruding, and then stretching the longitudinally stretched film in the width direction with a tenter,
The thickness of the raw material film MR continuously formed by this sequential biaxial stretching method is measured at a plurality of positions. More specifically, the β ray thickness measuring device (β
A film thickness meter that uses the attenuation of a line as an index is installed, and the β film thickness meter is continuously reciprocated in the width direction of the film material MR to pass through the film material MR.
Measure the thickness and the measurement position in the width direction. At this time, the measurement position in the width direction is set to a plurality of predetermined positions (constant intervals) in the width direction of the original film MR. In this case, the order of the thickness data is reversed in the forward path and the return path of the β-ray thickness measuring instrument, but when the thickness data is stored in the storage means of the thickness data described later, it is rearranged so as to have the same order as the forward path. To do so. Accordingly, it is possible to measure with time at a plurality of predetermined positions in the width direction of the original film MR and in the longitudinal direction of the original film MR. It is also possible to install a plurality of β-ray thickness measuring devices at regular intervals in the width direction of the original film MR and simultaneously measure thickness data at a plurality of positions of the original film MR.

Then, the measured thickness data of the original film MR is temporarily stored in the thickness data storage means, and the thickness data of the original film MR stored in this storage means is changed to the thickness data. The data of the film roll MR is taken up at predetermined positions in the width direction of the film roll MR to obtain the thickness of the film roll of the film roll MR at predetermined positions in the width direction of the film roll MR. Data can be obtained. As for the thickness data at a plurality of predetermined positions in the width direction of the film roll MR of the film roll, when the film roll is wound up, a winding signal is sent from the film winder to the thickness data storage means and calculation means. According to the above, the thickness data is calculated by the thickness data calculation unit that receives the thickness data from the thickness data storage unit. In this case, the thickness data at a plurality of predetermined positions in the width direction of the original film MR is not limited to the whole (total length and width) of the original film MR wound on the film roll, and the longitudinal direction and width of the original film MR. Arbitrary portion in the direction (a portion of the slit film SR of the slit roll obtained by slitting the original film MR (more specifically, a measurement region M slightly larger than the portion of the slit film SR shown in FIG. 2).
The thickness data of T) is extracted and obtained.

Next, the quality judgment method of the slit roll according to the present invention will be described.

This slit roll quality judgment method is based on the thickness data at a plurality of predetermined positions in the width direction of the film roll MR of the film roll obtained by the above film roll quality judgment method. The quality of the slit roll obtained by slitting the original film MR is judged. Although various concrete methods for determining the quality of the slit roll are conceivable, for example, thickness data of a plurality of positions in the width direction of the film raw fabric MR of the film roll, specifically, the longitudinal direction of the film raw fabric MR. And, from the thickness data of an arbitrary portion in the width direction, the thickness data at a plurality of specific positions is taken in, and based on the thickness data, the slit roll SR obtained by slitting the film original fabric MR is wound. The rolled-up state is calculated by the calculation means of the thickness data, and the quality of the slit roll is judged.

By the way, as described above, the quality of the slit roll is judged by a user such as a film processor who is the user of the slit roll 1 having a bump-shaped protrusion 11 on the surface as shown in FIG. When it is rewound and used, wrinkles and slacks are generated in the portion where the bump-like bulge 11 is formed and in the vicinity thereof, resulting in defective bag making. In particular, when a printing process is performed, printing deviation occurs. However, by calculating the thickness data in the width direction of the slit film, which is a factor of forming the bump-like protrusion 11 of the slit roll 1, by calculating the thickness data as described above, The quality of the slit roll, specifically, the degree of appearance of a local variation in the thickness of the slit roll (a bump-like protrusion 11 on the surface of the slit roll 1) is numerically shown. By using this number, the quality of the slit rolls, automatically, and that a short time, can be determined human error rather accurately.

Next, a more concrete first method of the slit roll quality judging method according to the present invention will be described.

According to this method, the quality of the slit roll is judged by the following procedure by taking in the thickness data at a plurality of specific positions from the thickness data of an arbitrary portion in the longitudinal direction and the width direction of the original film MR. , Based on this thickness data,
The rolled up state of the slit roll wound with the slit film SR obtained by slitting the original film MR,
It is calculated and calculated by the calculation means of the thickness data. Calculation of Vertical Average Thickness Among the thickness data of the original film MR, the thickness data of the slit film SR serving as a slit roll is averaged for each same position in the width direction of the slit film SR to obtain a vertical average thickness. . The average thickness is calculated for each slit roll from the vertical average thickness of the calculation of the average thickness. Standard deviation (σ) for each slit roll from the vertical average thickness of the standard deviation (σ) calculation
Ask for. The maximum and minimum values of the vertical average thickness are searched for each slit roll from the vertical average thickness of the calculation of the pattern coefficient (PK value), and from the maximum value and the minimum value of the vertical average thickness and the average thickness of The pattern coefficient (PK value) represented by the formula is calculated. Pattern coefficient (PK value) = (maximum thickness-average thickness)
/ (Average thickness-minimum thickness) From the standard deviation (σ) of the slit roll quality judgment and the pattern coefficient (PK value), the film thickness nonuniformity of the slit film SR is numerically understood. By doing so, the quality of the slit roll is determined.

The judgment of the quality of the above slit roll is as follows.
As shown in FIG. 3, first, the standard deviation (σ) is determined (first step), and based on the result, the pattern coefficient (PK value) is determined (second step). Note that the judgment reference value (threshold value) at each stage
Can use a predetermined judgment reference value according to the film thickness of the slit film SR and the like, and Table 1 shows an example thereof.

[0031]

[Table 1]

(First Step) In the first step, for the standard deviation (σ) of, for example, judgment reference values S1, S2, S
3 and S4 (see Table 1 (a)), and according to the result, the pattern coefficient (PK value) of the second stage
Is determined. That is, standard deviation (σ) ≦ S1 → second stage (PK1) S1 <standard deviation (σ) ≦ S2 → second stage (PK2) S2 <standard deviation (σ) ≦ S3 → second stage (PK3) S3 < Standard deviation (σ) ≦ S4 → second stage (PK4) S4 <standard deviation (σ) → P5 (defective product).

(Second Step) In the second step, for the pattern coefficient (PK value) of, for example, the judgment reference value PK1,
The determination is made according to PK2, PK3, PK4 (see Table 1 (b)), and the quality of the slit roll is determined according to the result. That is, pattern coefficient (PK value) ≤ PK1 → A1 (product) pattern coefficient (PK value)> PK1 → P1 (defective product) pattern coefficient (PK value) ≤ PK2 → A2 (product) pattern coefficient (PK value)> PK2 → P1 (defective product) pattern coefficient (PK value) ≤ PK3 → A3 (product) pattern coefficient (PK value)> PK3 → P3 (defective product) pattern coefficient (PK value) ≤ PK4 → A4 (product) pattern coefficient (PK Value)> PK4 → P4 (defective product). In addition, in general, the quality decreases as A1 (product) → A4 (product).

Next, a more specific second method of the slit roll quality judging method according to the present invention will be described.

In this method, the quality of the slit roll is judged by using the following coefficient of variation (TV value (%)) instead of the pattern coefficient (PK value) shown in the above method. It is similar to the above method. The quality judgment method of these two slit rolls should be selected according to the material and properties of the target film. For example, in the case of a biaxially stretched polypropylene film, the former or the biaxially stretched polypropylene film. In the case of polyethylene terephthalate film, it is desirable to judge the quality by the latter.

The maximum and minimum values of the vertical average thickness are searched for each slit roll from the vertical average thickness of the calculation of the coefficient of variation (TV value (%)), and the maximum and minimum values of the vertical average thickness and From the average thickness, the coefficient of variation (T
V value (%)) is calculated. Coefficient of variation (TV value (%)) = ((maximum value of thickness-minimum value of thickness) / average thickness) × 100 Standard deviation (σ) of judgment of quality of slit roll and coefficient of variation (TV value ( %)), The quality of the slit roll is determined by quantifying and understanding the nonuniformity of the film thickness of the slit film SR.

The judgment of the quality of the above slit roll is as follows.
As shown in FIG. 4, first, the standard deviation (σ) is determined (first step), and based on the result, the coefficient of variation (TV value (%)) is determined (second step). . Note that the judgment reference value (threshold value) at each stage
Can use a predetermined judgment reference value according to the film thickness of the slit film SR and the like, and Table 2 shows an example thereof.

[0038]

[Table 2]

(First Stage) In the first stage, for the standard deviation (σ) of, for example, judgment reference values S1, S2, S
3 and S4 (see Table 2 (a)), and according to the result, the variation coefficient (TV value (%)) of the second stage is determined. That is, standard deviation (σ) ≦ S1 → second stage (TV1) S1 <standard deviation (σ) ≦ S2 → second stage (TV2) S2 <standard deviation (σ) ≦ S3 → second stage (TV3) S3 < Standard deviation (σ) ≦ S4 → second stage (TV4) S4 <standard deviation (σ) → P5 (defective product).

(Second stage) In the second stage, the variation coefficient (TV value (%)) of
1, TV2, TV3, TV4 (see Table 2 (b)), and according to the result, the quality of the slit roll is judged. That is, coefficient of variation (TV value (%)) ≤ TV1 → A1 (product) coefficient of variation (TV value (%))> TV1 → P1 (defective product) coefficient of variation (TV value (%)) ≤ TV2 → A2 (product ) Coefficient of variation (TV value (%))> TV2 → P1 (defective product) Coefficient of variation (TV value (%)) ≤ TV3 → A3 (product) Coefficient of variation (TV value (%))> TV3 → P3 (defective product) ) Coefficient of variation (TV value (%)) ≤ TV4 → A4 (product) Coefficient of variation (TV value (%))> TV4 → P4 (defective product). In addition, in general, the quality decreases as A1 (product) → A4 (product).

Next, a method for manufacturing the slit roll according to the present invention will be described.

This slit roll manufacturing method is based on the thickness data at a plurality of predetermined positions in the width direction of the film roll MR of the film roll obtained by the above-mentioned film roll quality judging method. The position of the slit roll obtained by slitting the original fabric MR in the width direction of the original film MR of the film roll is selected. Although various concrete methods for manufacturing the slit roll are conceivable, for example, based on thickness data at a plurality of positions in the width direction of the film roll MR of the film roll, a slit roll obtained by slitting the film roll MR is obtained. Virtually judge the quality before actually slitting,
The slit position of the original film MR is determined according to the required quality, and the slit position is determined so that the loss is minimized. Note that the slit roll quality determination method is based on the above slit roll quality determination method.

As a result, it is possible to surely obtain the slit rolls which meet the required quality, reduce the slit rolls to be discarded, and improve the product yield.

[0044]

According to the method for determining the quality of a film roll of the present invention, the width of the film roll of the film roll wound with the film roll is measured by directly measuring the thickness of the film roll after stretching. Since the thickness data of a plurality of predetermined positions in the direction is obtained, when the winding of the roll is completed, the quality of the film roll can be automatically and accurately determined in a short time without human error. It is possible to obtain a slit roll with stable quality.

Further, according to the slit roll quality judging method of the present invention, when the winding of the roll of the film roll is completed, the film roll can be automatically and accurately obtained from the film roll in a short time without any human error. The quality of the slit roll can be determined.

Further, according to the slit roll manufacturing method of the present invention, it is possible to surely obtain the slit rolls which meet the required quality, reduce the slit rolls to be discarded, and to improve the product yield. Can be improved.

Further, according to the film roll quality judgment apparatus for carrying out the film roll quality judgment method of the present invention, the film roll after the stretching is moved in the width direction of the film roll while the thickness of the film roll is moved in the width direction of the film roll. Since the film thickness is measured with a thickness measuring device for the film original that is measured at a plurality of predetermined positions in the width direction of the original, the width of the film original of the film roll on which the film original is wound is predetermined. The thickness data at a plurality of positions can be accurately obtained by a simple mechanism.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an example of the shape of a slit roll.

FIG. 2 is an explanatory diagram showing a method for measuring the thickness of a film original fabric.

FIG. 3 is a flowchart showing a first embodiment of a slit roll quality determination method.

FIG. 4 is a flowchart showing a second embodiment of a slit roll quality determination method.

[Explanation of symbols]

1 slit roll 11 Raised bumps on the surface of the slit roll 2 paper tubes

Claims (6)

[Claims] 1. The thickness of the stretched film original fabric is measured at predetermined positions in the width direction of the original film raw fabric and in the longitudinal direction of the original film fabric, and the measured thickness of the original film fabric is measured. By accumulating the thickness data for each of a plurality of predetermined positions in the width direction of the film original, the thickness data of the film roll of the film roll on which the film original is wound is obtained at a plurality of predetermined positions in the width direction of the film original. A film roll quality determination method characterized by the above. 2. The film roll of the film roll is slit based on the thickness data at a plurality of predetermined positions in the width direction of the film roll of the film roll obtained by the method for determining the quality of the film roll according to claim 1. A slit roll quality determination method, characterized in that the quality of the slit roll obtained by the above is determined. 3. The slit roll quality determination method according to claim 2, wherein the quality of the slit roll is determined based on a standard deviation of thickness data and a pattern coefficient represented by the following formula. . Pattern coefficient = (maximum thickness-average thickness) / (average thickness-minimum thickness) 4. The slit roll quality determination according to claim 2, wherein the quality of the slit roll is determined based on the standard deviation of the thickness data and the coefficient of variation represented by the following formula 2. Method. Coefficient of variation = ((maximum thickness-minimum thickness) / average thickness) x 100 5. The film roll of the film roll is slit based on the thickness data at a plurality of predetermined positions in the width direction of the film roll of the film roll obtained by the method for determining the quality of the film roll according to claim 1. A method of manufacturing a slit roll, comprising: selecting a position of the slit roll obtained in the width direction of the film original film of the film roll. 6. A thickness measuring device for a raw film, which measures the thickness of the stretched original film at a plurality of predetermined positions in the width direction of the raw film while moving in the width direction of the raw film. A storage means for storing thickness data of the film original fabric measured in the longitudinal direction of the film original fabric with a thickness measuring device for the film original fabric, and a thickness of the film original fabric stored in the storage means. The thickness data of a plurality of predetermined positions in the width direction of the film roll of the film roll on which the film roll is wound is calculated by accumulating the data for each predetermined position in the width direction of the film roll. A film roll quality determination device comprising: a calculation means.