JPS5814601B2 - Kato Seishi Tozaino Henkeiryousokuteihohou - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring the amount of deformation of a flexible sheet material, and in particular to a method for measuring the amount of deformation in any direction of a thin flexible sheet material. be.

Traditionally, thin flexible sheet materials, e.g.
Sheet materials made of metals or alloys such as 0μ aluminum, steel, iron, phenolic resin, furan resin, kelp, etc.
・Formaldenide resin, xylene formaldehyde resin, urea resin, melamine resin, aniline resin, alkyd resin, unsaturated polyester resin, epoxy resin,
Polyethylene resin, polypropylene resin, polystyrene resin, polyP-xylylene resin, polyvinyl acetate resin, polyacrylate resin, polymethacrylate resin, polyvinyl chloride resin, polyvinylidene chloride resin, polyacrylonitrile resin, polyvinyl ether resin, polyvinyl ken When measuring the amount of deformation of a sheet material made of resin, polyether resin, polycarbonate resin, polyamide resin, and their copolymers, cut the sheet material to be measured into tape shapes and use a length measuring device or comparator. The amount of deformation of the tape-shaped sheet material in one direction was measured.

However, when the thickness of the sheet material to be measured is less than 250μ, it becomes difficult to stretch and hold the sheet material uniformly on the surface of the measuring instrument, and the accuracy of measuring the amount of deformation decreases.
This method has the drawback that only the amount of deformation in the direction can be checked, and furthermore, the measurement accuracy of transient phenomena and hysteresis phenomena of deformation related to the temperature, humidity, thermal shock, creep, etc. of the sheet material is extremely low.

SUMMARY OF THE INVENTION An object of the present invention is to eliminate the above-mentioned drawbacks and provide a measuring method that can measure the amount of deformation of the sheet material to be measured almost simultaneously in all directions.

Such an object of the present invention is to apply a ferromagnetic coating liquid concentrically onto a circle-shaped sheet material to be measured, and apply it in one direction around the center point of the surface to be measured of the sheet material to be measured. After recording and reproducing a specific signal on the ferromagnetic coating layer while applying rotation to the sheet material to be measured, the sheet material is left in an atmosphere under different temperature conditions and reproduced again. This is achieved by a method for measuring the amount of deformation of a flexible sheet material, characterized in that the amount of deformation of the sheet material is determined based on the output value of each reproduced signal.

Hereinafter, one embodiment of the present invention will be described according to the accompanying drawings.

1 is cut into a circle and has a ring-shaped ferromagnetic layer 2 on one side.
The flexible sheet material to be measured is provided with.

Reference numeral 3 denotes a rotation mechanism for imparting rotation to the sheet material 1, which includes a motor 4, a back plate 6 made of a circular non-magnetic material fitted to the upper end shaft of the output shaft 5 of the motor 4, and a rotation mechanism 3 for rotating the sheet material 1. It consists of a stopper 7 that can be screwed onto the upper end surface.

8 supports the back plate 1- by a support mechanism (not shown).
6 It is a magnetic field supported upwards.

First, a sheet material 1 to be measured and a ferromagnetic coating liquid are prepared.

The ferromagnetic coating liquid comprises the following ferromagnetic fine powder and binder.

The ferromagnetic fine powder used in the present invention includes γFe
2 03 + Co-containing γ-Fe203, Fe
304 +CO-containing Fe304rCrO2, Co-N
Known ferromagnetic fine powders such as i-P alloy and Co-Ni-Fe alloy can be used.
Publication No. 0, Special Publication No. 45-1.8372, Special Publication No. 4
7-22062 Publication, Japanese Patent Publication No. 47-2251.3, Japanese Patent Publication No. 46-28466, Japanese Patent Publication No. 46-38
Publication No. 755, Special Publication No. 47-4286, Special Publication No. 4
No. 7-12422, Japanese Patent Publication No. 17284, Japanese Patent Publication No. 18509, Japanese Patent Publication No. 18509, Japanese Patent Publication No. 47-1.8
It is described in Publication No. 573, etc.

Further, as the binder used in the present invention, conventionally known thermoplastic resins, thermosetting resins, reactive resins, and mixtures thereof are used.

The thermoplastic resin has a softening temperature of 150°C or less and an average dissolution amount of 10.000 to 200.000. Degree of polymerization is about 20
0 to about 1000, such as vinyl chloride vinyl acetate copolymer, vinyl chloride vinylidene chloride copolymer, vinyl chloride acrylonitrile copolymer, acrylic acid ester acrylonitrile copolymer, allyl acid ester vinylidene chloride copolymer, Acrylic acid ester styrene copolymer, methacrylic acid ester acrylonitrile copolymer,
Meccrylic acid ester vinylidene chloride copolymer, methacrylic acid ester styrene copolymer, Warekun elastomer, polyvinyl fluoride, vinylidene chloride acrylonitrile copolymer, butadiene acrylonitrile copolymer, polyamide resin, polyvinyl butyral, cellulose derivative (cellulose acetate) plasticate, cellulose diacede-1, cellulose triacetate, cellulose propionate, nitrocellulose, etc.), styrene pucdiene copolymer, polyester resin, chlorovinyl ether acrylate copolymer, amino resin, various synthetic rubbers thermoplastic resins, mixtures thereof, and the like are used.

Examples of these resins are given in Japanese Patent Publication No. 37-6877, 39-
No. 12528, No. 39-19282, No. 4015349, No. 40-20907, No. 41-9463, 4. 1
- 1 4 0 5 No. 9, 41-1.6985, 4
No. 2-6428, No. 42-11621, No. 43-4623
No., 43-15206, 44-2889, 44-1
No. 7947, No. 44-18232, No. 45-14020, No. 45-14500, No. 4'l-18573, No. 47-
No. 22063, No. 47-22064, No. 47-22068
No. 47-22069, No. 17-22070, 47
It is described in publications such as No.-27886.

As a thermosetting resin or a reactive resin, it has a molecular weight of 200,000 or less in the state of a coating liquid, and is suitable for coating,
By heating after drying, the molecular weight becomes infinite due to reactions such as condensation and addition.

Also, among these resins, those that do not soften or melt before the resin is thermally decomposed are preferred.

Specifically, for example, phenol resin, epoxy resin, polyurethane curable resin, urea resin, melamine resin, alkyd resin, silicone resin, acrylic reaction resin, epoxy polyamide resin, nitrocellulose melamine resin, high molecular weight polyester resin and incyanate. - mixtures of prebolimers, mixtures of methacrylate copolymers and diisocyanate prebolimers, mixtures of polyester polyols and polyisocyanates, urea formaldehyde resins, mixtures of low molecular weight glycols/high molecular weight diols/triphenylmethane triisocyanates, polyamine resins , and mixtures thereof.

Examples of these resins are given in Japanese Patent Publication No. 39-8103, 40-
No. 9779, No. 41-7192, No. 41-8016, 4
1-14275, 42-18179, 43-120
No. 81, No. 44-28023, No. 45-14501, 4
No. 5-24902, No. 46-13103, No. 47-220
No. 65, No. 47-22066, No. 47-22067, 4
No. 7-22072, No. 47-22073, No. 47-280
It is described in publications such as No. 45, No. 47-28048, and No. 47-28922.

These binders may be used alone or in combination;
Other additives may be added.

The mixing ratio of the ferromagnetic powder and the binder is in the range of 10 to 200 parts by weight per 100 parts by weight of the ferromagnetic powder.

Additives include dispersants, lubricants, abrasives, and the like.

A ferromagnetic coating liquid consisting of fine ferromagnetic powder and a binder as described above is coated on one side of the sheet material 1 to be measured in an area or amount that does not substantially affect the deformation characteristics of the sheet material 1. The ferromagnetic layer 2 is obtained by applying the ferromagnetic material layer 2 in a circular shape.

The ferromagnetic layer 2 has a constant width D and a constant thickness t as shown in FIG. In addition to forming a complete circle as shown in Figure 1a, if necessary, the first
As shown in FIG. b, a circular ring with a non-recording area is formed by partially applying silicone oil S.

Note that the ring-shaped ferromagnetic layer 2 usually has a length of 75 to 150 m.
The above-mentioned strength is applied using a spray set application method so as to have a constant value within the range of a radius r of m, a thickness t of 0.1 to 0.2μ, and a width D that is greater than or equal to the track width d of the magnetic head 9. It was obtained by applying a magnetic coating liquid and drying it.

As described above, the sheet material 1 to be measured having the ferromagnetic material layer 2 on one side is cut into a circle with a radius R centered on the center point O using scissors or other simple cutter. It should be larger than the outer radius of the body layer 2 and equal to or smaller than the radius of the back plate 6, but usually 1
It is often cut into a circle with a radius R of 00 mm.

A screw shaft of a stopper 7 passes through the center O of the circularly cut sheet material 2 to be measured, and the stopper 7 is screwed onto the upper end surface of the output shaft 5 to attach the sheet material 1 to the back. Set on plate 6.

When the power circuit (not shown) of the motor 4 is closed and the sheet material 1 set on the back plate 6 is rotated in the direction of arrow CW, the sheet material 1 will rotate as the rotational speed increases. As shown in FIG. 3 in an enlarged manner, it begins to float above the back plate 6.

When the rotational speed is further increased, centrifugal force and the tensile force of the air layer moving between the sheet material 1 and the back plate 6 act on the sheet material 1 in the direction of the arrow F, excluding the central portion of the sheet material 1. The entire area is stretched flat and floats stably on the back plate 6.

The number of rotations of the sheet material 1 at which the sheet material 1 reaches a stable floating state as described above varies depending on the thickness of the sheet material 1, but is usually 300 to 10.000 r. p. It is often within the range of m.

After a stable floating state of the sheet material 1 is obtained, the magnetic head 8 is moved to a position where the entire track width d of the magnetic head 8 can be completely contacted with the upper surface of the ferromagnetic layer 2 by a support mechanism (not shown). 2), and a signal of a constant frequency is recorded via the magnetic head 8 over the entire circumference of the ferromagnetic layer 2.

When the recording of the signal of the constant frequency is completed, the output of the reproduced signal is measured over the entire circumference of the ferromagnetic layer 2.

For the rotating mechanism 3, magnetic head 8, and recording/reproducing system, mechanisms and circuits used in ordinary video recorders can be used.

Furthermore, if a portion of the ferromagnetic layer 2 is removed or covered with an insulating material and the recording operation of a constant frequency signal as described above is performed, the reproduced signal output at that portion becomes zero, so that the sheet to be measured is It becomes easy to correspond between the measurement location of the material 1 and the measured output.

After measuring and reading the output of the reproduction signal over the entire circumference of the ferromagnetic layer 2 in correspondence with the measurement location, the sheet material 1 to be measured is set on the rotation mechanism 3 and heated to a specific temperature and temperature. The sheet material 1 to be measured is left in an atmosphere where humidity conditions are maintained for a specified period of time, and while the sheet material 1 to be measured is rotated and levitated again, the output of the reproduction signal is measured and read in correspondence with the measurement location, and the Compare the first measured output and the second measured output.

When the measurement point is deformed in the direction of the radius r, the output of the reproduced signal also changes in proportion to the amount of deformation, so a difference occurs between the two outputs.

Therefore, the amount of deformation in the direction of the radius r at each measurement location of the sheet material 1 to be measured can be determined from the following equation.

That is, in the above equation, Δr is the amount of deformation, E1 is the voltage measured first as the output of the reproduced signal, E2 is the voltage measured after the second as the output of the reproduced signal, and d is the track IJ of the magnetic head 8.

Note that the above equation assumes that the amount of deformation and displacement of the magnetic head 8 and the support machine are extremely smaller than the amount of deformation of the sheet material 1 to be measured and can be ignored; however, in fact, As a result of actually measuring the amount of deformation and displacement as described above under various atmospheric conditions, it was found that the amount of deformation and displacement of the polishing head 8 and the support mechanism was one order of magnitude smaller than the amount of deformation of the sheet material 1 to be measured. It was confirmed that
It will be obvious that the degree of deformation or strain can be obtained by dividing the amount of deformation Δr in the direction by the radius r.

By the method of the present invention explained above, the following novel effects can be obtained.

1) Since the sheet material to be measured is placed on the back plate and rotated at high speed, even thin sheet materials to be measured can be easily kept in a flat and stretched state, which is necessary for accurate measurement of the amount of deformation. The flatness of the measured object can be obtained.

2) Since the ferromagnetic layer was provided in a ring shape on the sheet material to be measured, it became possible to measure the amount of deformation of the sheet material to be measured in all directions.

3) Transient phenomena and hysteresis phenomena of deformation of the sheet material to be measured can be accurately measured by measuring the output of the reproduced signal over the entire circumference of the ferromagnetic layer while varying the surrounding atmospheric conditions of the sheet material to be measured. can.

Next, examples will be given to explain the effects of the present invention.
1 A ferromagnetic coating liquid having the following composition was applied to the surface of a 12μ thick polyethylene sheet cut into a circle with a diameter of 200 mTL, with a thickness of 6μ, an inner radius of 80mm, and an outer radius of 85rILr.
/L by a spray coating method to form a complete circle.

After that, the sheet material was loaded into the recorder to the video theater 1 while rotating at 3600 rpm.
The middle head of a magnetic head with a rack width of 100 μm was positioned above the sheet material with a diameter of 82.5 mm, and an IMHz signal was recorded on the ferromagnetic coating layer.

When the signal was recorded, the atmosphere around the G-1 material was DB 20° C. and 60% RH, and the output of the reproduced signal was 2 mV for every four magnetic material coated layers around the entire circumference.

The Video Sea I-Recorder with the seal/material to be measured left in place was left in a thermostat where an atmosphere of DB 30°C and 60% RH was maintained for one hour, and the output of the playback signal was measured again. , 1. at some measurement points. ]. m
V was measured, and the other measurement points were 2rnV.

When the amount of deformation △r of some measurement points is calculated from the previous equation, it becomes as follows, and the strain at the measurement point is 0.0 4 5/8 2. 5ki was 0.0005.

Example 1■ In Example-■, the sheet material on which the IMI{Z signal was recorded in an atmosphere of DB 20°C and 40% RH was
As a result of leaving it in a thermostat where an atmosphere of 60% RH is maintained at 20°C for 5 hours and measuring the output of the reproduced signal again,
- At the measuring point of 0. 8 mV was measured.

The amount of deformation Δr at the measurement point was calculated from the previous equation, and the strain at the measurement point was 0.0 6/8 2.5 characters 0.0005.

Example 1■ Nylon 6 with a thickness of 20μ cut into a circle with a diameter of 200mm
The same coating liquid as in Example-■ was applied to the surface of the sheet in the same shape and using the same application method, and then the sheet was coated with the same coating solution as in Example-■. After applying recon oil to a part of the upper surface of the ferromagnetic layer in the radial direction, the Example--
The same signal as in (2) was recorded.

The signal was immediately regenerated and the output was measured, and as a result, it was 2 mV at the area other than the area where the silicone oil was applied.

Since the signal is not recorded at the silicone oil application point, the silicone oil mark S as shown in FIG. Ta.

Next, the sheet was left in a thermostat that maintained an atmosphere of 60% RH at 45°C for 1 hour, and the output of the reproduced signal was measured again. As a result, the output envelope showed a sine curve shape as shown in Figure 4b. and a maximum of 1. 1 mV,
A minimum voltage of 0.8 mV was measured.

By substituting the voltage measurement value into the above equation in the same manner as in Examples -1 and -2, it was possible to determine the amount of radial deformation and strain at each measurement location.

Example-■ Using the same sheet, coating liquid, coating method, and shape as in Example-■, record the same signal as in Example-■ in an atmosphere of 60% RH at 20°C, and immediately record the signal. After reproducing and measuring the output, the output of the reproduced signal was continuously measured while being left in a thermostat that maintained an atmosphere of DB 40° C. and 60% RH.

As a result, the initial output was 2 mV, but the output began to decrease after 10 seconds, and after 180 seconds it became 0. 8 m
There were some places where the voltage had dropped to V.

As explained above, the present invention has the effect that it is possible to easily and accurately measure the amount of deformation in all directions and quantify transient phenomena or hysteresis phenomena, which cannot be expected with conventional methods or devices. Particularly in the field of manufacturing and processing plastic film webs, accurate evaluation of the deformation characteristics of the web greatly contributes to stabilizing product quality and reducing losses.

[Brief explanation of the drawing]

FIGS. 1a and 1b are plan views of a sheet material to be measured and a ferromagnetic layer provided on the sheet material, showing one embodiment of the present invention,
FIG. 2 is a side view showing the upper part of the rotation mechanism that rotates the sheet material to be measured, in cross section at -. FIG. 3 is a side sectional view showing an enlarged part A of FIG. Figures 4a and 4b are output waveform diagrams of each reproduced signal previously measured in Example 1 (2). 1 is a sheet material to be measured, 2 is a ferromagnetic layer, 3 is a rotating mechanism,
4 is the motor, 5 is the output shaft, 6 is the back plate, 7 is the stopper, 8 is the magnetic head, O is the center point, r is the radius of the ferromagnetic layer 2, { is the radius of the sheet material 1 to be measured. radius, D
is the coating width of the ferromagnetic layer 2, t is the coating thickness of the ferromagnetic layer 2, d is the track width of the magnetic head 8, and S is a silicon oil mark.

Claims (1)

[Claims] 1. A method for measuring the amount of deformation of a flexible sheet material,
A ferromagnetic coating liquid is applied concentrically onto a circular sheet material to be measured, and the sheet material is rotated in one direction around the center point of the surface to be measured of the sheet material. Recording a specific signal on a coating layer of ferromagnetic material, measuring the output of the reproduced signal, and then leaving the sheet material in an atmosphere under different temperature and humidity conditions from the previous recording or reproduction,
A method for measuring the amount of deformation of a flexible sheet material, characterized in that the reproduction output is measured again, and the amount of deformation of the sheet material is determined based on the following formula.