JP2016151567A - Resin film roll shape measurement method and measurement apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a resin film roll shape measurement method and a measurement apparatus, capable of avoiding problems such as formation of scratches, folding creases or adhesion of a foreign substance to a film surface, and also avoiding such inaccuracy in a measurement result as occurring at a non-contact method.SOLUTION: In a resin film roll shape measurement method, a gas is locally sprayed from a gas spray nozzle onto a measurement point on a surface of a resin film roll to obtain a state eliminating a lift of a surface layer film at the measurement point, and at the same time a non-contact type displacement sensor scans in a film width direction so as to measure a surface displacement.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a resin film roll shape measuring method and measuring apparatus.

As a method for measuring the shape of the resin film roll, a contact method such as measuring by squeezing the resin film roll in the diameter direction with a jig with a displacement sensor on one side and scanning the sensor in the film width direction (for example, Patent Document 1), a non-contact method is known in which the surface of a resin film roll is measured in a non-contact manner by scanning a displacement sensor in the film width direction (for example, Patent Document 2).
In the contact type, there are risks such as generation of scratches on the film, generation of bending wrinkles due to twisting at the time of measurement, and adhesion of minute foreign substances from the measuring device to the film. In order to avoid these risks, the surface may be covered with a sheet for measurement, but in that case, it is necessary to pay attention to the wrinkles and floating of the surface sheet.
On the other hand, in the non-contact type, an accurate measurement result may not be obtained due to the looseness of the film on the outermost layer of the resin film roll. This is particularly noticeable when the film end is not fixed or is not pulled with an appropriate tension.

JP 2002-168616 A JP 2006-88255 A

  The surface shape of the resin film roll is a state in which slight film thickness unevenness in the width direction of the film is accumulated by winding the film, and the film roll shape measurement is effective for measuring film thickness unevenness indirectly. It becomes a method.

  The present invention avoids problems such as scratch formation, crease, foreign matter adhesion, etc. on the outermost layer of the resin film roll, and the shape of the resin film roll that avoids the inaccuracy of the measurement result that occurs in the non-contact type. It is an object to provide a measurement method and a measurement apparatus.

The above problems are solved by the present invention described below.
1. A gas is sprayed from the gas spray nozzle to the measurement point on the surface of the resin film roll, centering on the measurement point, and the surface film at the measurement point is not lifted. Resin film roll shape measuring method to be scanned.
2. The gas blowing nozzle is located obliquely above or obliquely below the displacement sensor, and the angle (θ) from the resin film roll perpendicular is 40 to 140 deg. The measurement method according to claim 1, wherein
3. An electric actuator held at a certain distance from the resin film roll;
Resin having a displacement sensor facing the roll in the diameter direction of the roll on the work (cart) and a gas blowing nozzle located obliquely above or below the sensor and having an opening in the measurement point direction Film roll shape measuring device.

  According to the present invention, it is possible to perform shape measurement with the same accuracy as contact measurement without causing dirt and scratches on the surface of the resin film roll and without affecting measurement data due to floating or fluttering of the surface layer film. .

It is a schematic diagram (side surface, front) of the resin film roll shape measuring apparatus of the present invention. 6 is a measurement chart of Example 2 and Comparative Example 2. In addition, Example 2 shows a flow rate: 10 L / min, and Comparative Example 2 shows a flow rate: 5 L / min as a representative example.

  Hereinafter, the present invention will be described in detail. In the present invention, “to” includes values at both ends.

The type of resin of the resin film roll to be measured in the present invention is not particularly limited. For example, polyamide, polyester, polyolefin, styrene resin, polycarbonate, PPS resin, aromatic polyamide, polyethylene terephthalate, polyethylene naphthalate, polypropylene, Polyethylene, polyimide, etc. can be used. Moreover, the film multilayered by bonding these films can also be used.
These resin films are wound around the core to form a resin film roll.
The length of the resin film is not particularly limited.

  For example, as a polypropylene film roll, a film having a thickness of 3 to 50 μm, preferably 5 to 20 μm and a length of 20,000 m is applied to a core having a diameter of 3 to 6 inches, and a tension of 5 to 200 N / m, preferably 10 to 100 N / m. The roll wound up by m is mentioned.

The displacement sensor (displacement meter) used in the present invention is preferably an optical displacement sensor.
A commercially available displacement sensor is used.
The surface of the resin film roll is irradiated with visible light or laser from the displacement sensor, the distance between the surface of the resin film roll and the sensor is measured by the reflected light, and the measured quantity obtained is connected to the signal processing means as an electrical signal. The measured amount is calculated, displayed, and output. Thereafter, the signal processing means and the signal recording means are connected as necessary.
The position of the displacement sensor is adjusted so as to come in the diameter direction of the resin film roll.
Examples of the signal recording means include a recorder and a personal computer. For example, when connected to a personal computer, it is possible to perform pass / fail determination of the shape measurement result and alarm output, and it is possible to adjust the film forming process and the processing process of the resin film roll based on the shape measurement result.

  The displacement sensor is installed on a traveling device (cart or workpiece) that travels on a traveling rail (electric actuator) held at a certain distance from the resin film roll so as to face the film roll in the diameter direction of the film roll. The surface shape of the roll can be continuously measured by scanning the surface of the resin film roll in the film width direction.

  The traveling device is preferably a motor drive system capable of adjusting the speed, but a system that can be moved manually can also be adopted.

  The electric actuator for moving the displacement sensor is fixed at an angle or the like so as to be away from the surface of the resin film roll to the measurable distance of the sensor and not to contact the film roll.

A gas blowing nozzle is installed on the work on the electric actuator so as to be located obliquely above or obliquely below the displacement sensor, and moves simultaneously with the displacement sensor.
The gas blowing nozzle is installed, for example, by being fixed together with a displacement sensor on a stand provided on the workpiece.

The moving speed of the workpiece is 1 to 100 mm / s, preferably 10 to 50 mm / s.
If the moving speed of the workpiece is too slow than the same range, the measurement time becomes longer and the measurement efficiency becomes worse. If it is too fast, detection by the measurement sensor and signal processing may not be in time, and an error may occur in the measurement value.

The angle (θ) of the gas spray nozzle from the resin film roll normal is preferably 40 to 140 deg.
When the angle (θ) from the film roll perpendicular is shallower than the same range, the force to lift up by the spraying force from the side may be larger than the force of pressing up the surface film by the gas.

  Further, the inner diameter of the tip of the gas spray nozzle is desirably 20 to 100 times the measurement spot diameter of the displacement sensor. If the inner diameter of the nozzle tip is too smaller than the same range, it is necessary to match the measurement position of the displacement sensor with the spraying position with high precision, and if it is displaced, the effect of gas spraying cannot be obtained. If it is too large, a large amount of gas must be sprayed.

The linear distance d between the tip of the gas spray nozzle and the resin film roll surface is 5 to 30 mm, preferably 5 to 20 mm.
If the distance to the gas spray nozzle is too close to the same range, especially when the angle θ is shallow and the diameter of the roll to be measured increases, there is an increased risk of scratching the roll surface due to contact with the spray nozzle. In addition, if the spray nozzle is too far away, the force to hold the film on the roll surface is weakened, which is not preferable because it is necessary to increase the gas flow rate and pressure to spray a large amount of gas.

  The gas sprayed from the gas spray nozzle to the surface of the roll is not particularly limited as long as it does not affect the resin film, but examples include inert gas such as nitrogen and argon, and air, but it is inexpensive. Air is preferable, and air ionized by an ionizer is more preferable in order to suppress generation of static electricity on the film surface.

The original pressure of the gas blown from the gas blowing nozzle is 0.2 to 0.7 MPa, preferably 0.4 to 0.6 MPa.
If the source pressure is low, the force for pressing the roll surface with air does not work sufficiently, so that it is necessary to increase the spray flow rate so as to reduce the distance from the blow nozzle.

The spray flow rate is 7 to 20 L / m, preferably 10 to 15 L / m.
When the spraying flow rate is small, the pressing of the roll surface with air becomes insufficient, and the roll surface layer film is measured in a floating state, resulting in a deviation from the result measured by the contact method. On the other hand, increasing the spraying flow rate not only increases the cost, but also increases the risk of winding up and adhering surrounding foreign matter, which may affect the quality of the roll film.
In addition, gas is always sprayed during a measurement.

  Hereinafter, the present embodiment will be described more specifically by way of examples, but the present invention is not limited to these examples.

[Example 1]
Thickness: 14 μm, length: 6000 m of polypropylene film, diameter: 3 inches, material: roll wound around an ABS core at a winding tension of 30 N / m as a measurement object, ZW-S40 (OMRON) Measurement distance: 40 mm ± 6 mm, spot diameter: φ80 μm) Non-contact fiber coaxial displacement sensor, spray nozzle: inner diameter: φ2.5 mm, spray distance: 10 mm, air pressure: 0.5 MPa, flow rate: 10 L / min, electric While the actuator was stopped (speed: 0 mm / s), the fluttering of the film surface was measured with a displacement sensor for 10 s while changing the spray angle θ. The compressed air used for spraying was air ionized by an ionizer in order to suppress the generation of static electricity on the film surface.
In the range of the spray angle θ: 40 to 140 deg, the flutter of the roll surface film measured by the displacement sensor was 0.01 mm or less, and no flutter was observed.

[Comparative Example 1]
-In the said Example, as a result of measuring the flutter at the spray angle (theta): 30 deg and 150 deg with the displacement sensor, the flutter of the film surface larger than 0.01 mm was detected.

Table 1 below shows the results of Example 1 and Comparative Example 1.
In the fluttering judgment, 0.01 mm or less was evaluated as ◯.

[Example 2]
Using the roll to be measured of Example 1 and a displacement sensor, spray nozzle: inner diameter φ2.5 mm, spray distance: 10 mm, spray angle θ: 55 deg. Displacement of the resin roll by scanning the electric actuator in the film width direction at 50 mm / s while blowing ionized air on the roll surface at air pressure: 0.5 MPa, flow rate: 10 L / min, 15 L / min, 20 L / min Was measured. As a result of comparison with the measured values obtained with the contact-type displacement measuring instrument, the values were within 0.05 mm or less, and almost the same measured values of the surface shape could be obtained.

[Comparative Example 2]
In Example 2, the displacement of the roll surface was measured at three points of spraying flow rates of 0 L / min, 2 L / min, and 5 L / min. As a result of comparison with the measured value with the contact displacement measuring instrument, a deviation of 0.3 mm or more was confirmed in a part of the surface shape.

  Table 2 shows the results of Example 2 and Comparative Example 2.

1. Resin film roll 2. Core 3. Non-contact displacement sensor 4. Mounting stand 5. Electric actuator 6. Spray nozzle 7. Resin film roll surface and spray nozzle tip distance: d
8. Spray angle by spray nozzle: θ
9. Displacement sensor, spray nozzle scanning direction

Claims (3)

A gas is sprayed from the gas spray nozzle to the measurement point on the surface of the resin film roll, centering on the measurement point, and the surface film at the measurement point is not lifted. Resin film roll shape measuring method to be scanned. The gas blowing nozzle is located obliquely above or obliquely below the displacement sensor, and the angle (θ) from the resin film roll perpendicular is 40 to 140 deg. The measurement method according to claim 1. An electric actuator held at a certain distance from the resin film roll, a displacement sensor facing the roll in the diameter direction of the roll on the work (cart), and a diagonally upper or lower side of the sensor, A resin film roll shape measuring device having a gas blowing nozzle having an opening in a measuring point direction.

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