JP2021101160A - Viscoelasticity measuring device and viscoelasticity measuring method - Google Patents

Abstract

To provide a viscoelasticity measuring device and a viscoelasticity measuring method that can set the film thickness of a sample arbitrarily and can measure the curing speed even for a sample with a relatively thin film.SOLUTION: The viscoelasticity measuring device includes a first member including a flat part on which a sample is placed, a second member including a base and a protrusion projecting from the base towards the sample and in contact with the sample, a vibratory device capable of vibrating a first or second member, and an information processing unit capable of collecting information on the amplitude of the first or second member at the time when the vibratory device vibrates the first or second member. The vibratory device vibrates the first or second member while the sample is held between the flat part of the first member and the protrusion of the second member, and the viscoelasticity of the sample is measured based on the information on the amplitude of the first or second member.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a viscoelasticity measuring device and a viscoelasticity measuring method.

Ultraviolet curable ink (UV ink) is often used in recent inkjet printing machines. Technological development to control the curing of UV ink is being actively carried out. In an inkjet printing machine, control of the dot shape is regarded as important, and there is a relatively high need for precise analysis of the curing process.

The composition of the UV ink is exemplified in Non-Patent Document 1 below (see the column of "2. Outline of UV curable inkjet ink").

Non-Patent Document 2 below discloses a method for measuring the UV curing behavior of an epoxy acrylate-based prepolymer. Here, the sample (S) is sandwiched between the table (T) and the glass (G), and the glass (G) is vibrated to observe its displacement. A UV irradiation device is provided on the back surface of the glass (see "Fig. 2" and related parts).

Atsushi Asatake: Curing Characteristics of UV Inkjet Ink, Journal of the Imaging Society of Japan, Vol. 49, No. 5 (2010) 412-416 Yasufumi Otsubo et al .: Measurement of UV curing behavior of epoxy acrylate-based prepolymers using a diaphragm-type rheometer, Journal of the Society of Rheology, Vol. 12 (1984) 131-135

In the apparatus described in Non-Patent Document 2, it is difficult to freely control the thickness of the sample because the members sandwiching the sample are both flat plates. Therefore, it is necessary to confirm the spread of a sample of a specific weight when sandwiched between glasses in advance, and determine the weight of the sample so as to achieve the desired film thickness.

As another example of the device, for example, there is a model number "MCR series" manufactured by Antonio Par. In this device, the viscoelastic behavior is measured by sandwiching the sample between the upper and lower disk-shaped members, using the disk on one side as a transparent body, and measuring the rotational torque while irradiating the sample with ultraviolet rays. Even in such an apparatus, it is difficult to set an arbitrary film thickness because the film thickness of the sample can be grasped from the weight of the sample to be sandwiched and the area wet and spread on the disk-shaped member. In addition, since the area of the disk is large, it is difficult to form a thin film, and it is difficult to use it for curing analysis of a thin film.

In recent years, the thickness of the ink layer formed by an inkjet printing machine is about several μm. The industry is required to be able to measure the curing rate of this thin film. When it is desired to grasp the viscoelasticity of a thin film, it is not always possible to make a sufficient measurement with a conventional device.

A device that captures the fluorescence generated during the polymerization reaction and analyzes the progress of curing of the sample is also commercially available. However, the correlation between fluorescence and curing (viscoelasticity) varies depending on the material, and a unique correlation cannot always be obtained. The viscoelasticity of ink is an important quality index and can be an index such as film strength and stickiness, but it is not always possible to accurately detect the degree of progress of ink curing only by capturing fluorescence.

The present disclosure has been made in view of the above problems, and an object of the present disclosure is that the film thickness of the sample can be arbitrarily set, and the curing rate of a sample having a relatively thin film can be set arbitrarily. It is an object of the present invention to provide a viscoelasticity measuring device and a viscoelasticity measuring method capable of measuring viscoelasticity.

The viscoelasticity measuring device according to one embodiment is a viscous elasticity measuring device capable of measuring the viscous elasticity of a sample, and is a first member including a flat plate-shaped portion on which the sample is placed and a protrusion toward the sample. A second member including a protrusion that comes into contact with the sample, a vibration device capable of vibrating the first member or the second member, and the first member or the second member by the vibration device. The sample is provided with an information processing unit capable of collecting information on the amplitude of the vibrated first member or the second member when vibrated, and based on the amplitude information collected by the information processing unit. Measure viscoelasticity.

As an example, in the viscoelasticity measuring device, the flat plate-shaped portion of the first member is transparently formed, and the viscoelasticity measuring device is provided on the opposite side of the second member with respect to the first member. Further, an irradiation device capable of irradiating the sample with electromagnetic waves through the flat plate-shaped portion is further provided.

As an example, in the viscoelasticity measuring device, the viscoelastic device vibrates the first member or the second member with an amplitude in which a component affecting the curing of the sample is not taken into the sample from the atmosphere.

As an example, the viscoelasticity measuring device inserts the protrusion into the sample from a state in which the sample is sandwiched between the flat plate-shaped portion of the first member and the protrusion of the second member. It is possible.

As an example, the viscoelasticity measuring device moves the protrusion in a direction away from the sample from a state in which the sample is sandwiched between the flat plate-shaped portion of the first member and the protrusion of the second member. It is possible to adjust the film thickness of the sample.

As an example, in the viscoelasticity measuring device, the tip of the protrusion has a plane parallel to the flat plate-shaped portion.

As an example, in the viscoelasticity measuring device, the viscoelastic device vibrates the second member of the first member and the second member.

As an example, in the viscoelasticity measuring device, the viscoelastic device vibrates the second member in parallel with the flat plate-shaped portion of the first member.

As an example, in the viscoelasticity measuring device, the area of the tip of the protrusion is smaller than the cross-sectional area of the sample as seen from the second member side.

As an example, in the viscoelasticity measuring device, the first member or the second member is vibrated by the vibrating device while irradiating the sample with ultraviolet rays from the irradiation device through the flat plate-shaped portion, and the first member. Alternatively, the viscoelasticity of the sample is continuously measured based on the amplitude value of the second member and the phase difference of the vibration of the first member or the second member with respect to the output of the vibration exciter.

As an example, in the viscoelasticity measuring device, it is possible to use an ultraviolet curable ink for an inkjet printing machine as the sample.

The viscoelasticity measuring method according to one embodiment is a viscoelasticity measuring method capable of measuring the viscous elasticity of a sample, in which the step of placing the sample on a flat plate-shaped portion of the first member and the above-mentioned in the second member. Information on the amplitudes of the step of bringing the protrusion protruding toward the sample into contact with the sample, the step of vibrating the first member or the second member, and the vibrating first member or the second member is collected. It includes a step and a step of measuring the viscous elasticity of the sample based on the vibration information collected in the step of collecting the above information.

As an example, in the viscoelasticity measuring method, the sample is irradiated with an electromagnetic wave from the opposite side of the second member to the first member through the transparent flat plate-shaped portion of the first member.

As an example, in the viscoelasticity measuring method, the first member or the second member is vibrated with an amplitude in which a component affecting the curing of the sample is not taken into the sample from the atmosphere.

As an example, in the viscoelasticity measuring method, the step of bringing the protrusion into contact with the sample is from a state in which the sample is sandwiched between the flat plate-shaped portion of the first member and the protrusion of the second member. , Including digging the protrusion into the sample.

As an example, in the viscoelasticity measuring method, the step of bringing the protrusion into contact with the sample is from a state in which the sample is sandwiched between the flat plate-shaped portion of the first member and the protrusion of the second member. Includes adjusting the film thickness of the sample by moving the protrusion in a direction away from the sample.

As an example, in the viscoelasticity measuring method, the first member and the second member are provided so that the tip of the protrusion has a plane parallel to the flat plate-shaped portion.

As an example, in the viscoelasticity measuring method, the second member of the first member and the second member is vibrated.

As an example, in the viscoelasticity measuring method, the second member is vibrated in parallel with the flat plate-shaped portion of the first member.

As an example, in the viscoelasticity measuring method, the sample is provided so that the cross-sectional area of the sample seen from the second member side is larger than the area of the tip of the protrusion.

As an example, in the viscoelasticity measuring method, the first member or the second member is vibrated while irradiating the sample with ultraviolet rays through the flat plate-shaped portion of the first member, and the first member is vibrated. The viscoelasticity of the sample is continuously measured based on the amplitude value of the member or the second member and the phase difference of the vibration of the first member or the second member with respect to the output of the vibrating device that applies the vibration. To do.

As an example, in the viscoelasticity measuring method, an ultraviolet curable ink for an inkjet printing machine is used as the sample.

According to the present disclosure, in the viscoelasticity measuring device and the viscoelasticity measuring method, the film thickness of the sample can be arbitrarily set, and the curing rate can be measured even for a sample having a relatively thin film.

It is a figure which shows the basic structure of the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the method of adjusting the film thickness of a sample in the viscoelasticity measuring apparatus shown in FIG. It is a figure which shows the example of the method of adjusting the film thickness of a sample in the viscoelasticity measuring apparatus shown in FIG. It is a figure which shows the whole structure of the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the measurement example by the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the measurement example by the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the measurement example by the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the 2nd member in the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the 2nd member in the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the 2nd member in the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the 2nd member in the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows the example of the 2nd member in the viscoelasticity measuring apparatus which concerns on one Embodiment of this disclosure. It is a figure which shows each step of the viscoelasticity measuring method which concerns on one Embodiment of this disclosure.

Hereinafter, embodiments of the present disclosure will be described. In addition, the same reference code may be attached to the same or corresponding part, and the explanation may not be repeated.

In the embodiments described below, when the number, quantity, etc. are referred to, the scope of the present disclosure is not necessarily limited to the number, quantity, etc., unless otherwise specified. Also, in the following embodiments, each component is not necessarily essential to the present disclosure unless otherwise stated.

(Basic configuration)
FIG. 1 is a diagram showing a basic configuration of a viscoelasticity measuring device according to one embodiment of the present disclosure. The viscoelasticity measuring device according to the present embodiment is a device capable of continuously measuring the viscoelasticity of an ultraviolet curable ink for an inkjet printing machine.

As shown in FIG. 1, the viscoelasticity measuring device includes a first member 10 and a second member 20. Sample 30 is a thin film of ultraviolet curable ink for an inkjet printing machine.

The first member 10 includes a flat plate-like portion on which the sample 30 is placed. The first member 10 is formed transparently.

The second member 20 comes into contact with the sample 30 from the side opposite to the first member 10. That is, the sample 30 is sandwiched between the flat plate-shaped portion of the first member 10 and the second member 20. In this state, the second member 20 is vibrated in a direction parallel to the flat plate-shaped portion of the first member 10 (direction of arrow DR20). The viscoelasticity of the sample 30 is measured based on the amplitude information of the second member 20. The first member 10 may be vibrated instead of the second member 20.

The viscoelasticity measuring device further includes an irradiation device 40 that irradiates ultraviolet rays, which is a type of electromagnetic wave. The irradiation device 40 is provided on the opposite side of the second member 20 with respect to the first member 10. The irradiation device 40 can irradiate the sample 30 with ultraviolet rays through the first member 10. Curing of the sample 30 proceeds by the irradiation of the ultraviolet rays. The viscoelasticity measuring device continuously measures the degree of progress of this curing.

The second member 20 is vibrated with a small amplitude so that a component (for example, oxygen) that affects the curing of the sample 30 is not taken into the sample 30 from the atmosphere. By doing so, it becomes possible to measure the curing characteristics more accurately.

As shown in FIG. 1, the area of the tip surface of the second member 20 is compared with the cross-sectional area of the sample 30 placed on the planar portion of the first member 10 as seen from the second member 20 side. And relatively small. Therefore, the film thickness of the sample 30 can be freely adjusted while the second member 20 is in contact with the sample 30. Further, the sample 30 is relatively easily wetted and spread on the first member 10, and a thin film can be easily formed.

In a typical example, when adjusting the film thickness of the sample 30, the sample 30 is returned to a position slightly distant from the original surface of the sample 30 from the state of being slightly pushed into the sample 30 of the second member 20. Adjust the film thickness of. If the second member 20 is vibrated while being pushed into the sample 30, the measurement of viscoelasticity may be unintentionally affected when the sample 30 around the second member 20 is cured. By returning the second member 20 to a position slightly distant from the original surface of the sample 30 and then vibrating it, more accurate measurement of viscoelasticity becomes possible.

(Film thickness adjustment method)
2 and 3 are diagrams showing an example of a method for adjusting the film thickness of the sample in the viscoelasticity measuring device according to the present embodiment.

In the example of FIG. 2, first, a sample 30 having an appropriate weight is dropped onto the flat plate-shaped portion of the first member 10. From the state where the second member 20 is separated from the sample 30 as shown in FIG. 2A, the second member 20 is moved in the direction of the arrow A, and the tip surface of the second member 20 is brought into contact with the sample 30. As a result, the sample 30 is sandwiched between the first member 10 and the second member 20.

From this state, as shown in FIG. 2B, the second member 20 is fitted into the sample 30 to an arbitrary thickness. After that, as shown in FIG. 2C, the film thickness of the sample 30 is adjusted by moving (raising) the second member 20 in the direction away from the sample 30. Since the tip of the second member 20 is formed in a rod shape and the area of the tip surface is small, the sample 30 adheres to the tip surface of the second member 20 and rises. The film thickness of the sample 30 is adjusted by utilizing this phenomenon.

In the example of FIG. 3, the sample 30 is placed on the flat plate-shaped first member 10 as a small amount of droplets (FIG. 3 (a)), and the second member 20 is lowered and spread (FIG. 3 (b)). The second member 20 is stopped at a position not wider than the diameter of the tip surface (FIG. 3 (c)).

(Measurement principle)
FIG. 4 is a diagram showing the overall configuration of the viscoelasticity measuring device according to the present embodiment. Hereinafter, the method of measuring viscoelasticity will be described in more detail with reference to FIG.

The viscoelasticity measuring device includes the first member 10, the second member 20, and the irradiation device 40 described above. The second member 20 includes a base 21 and a protrusion 22 projecting from the base 21 to the first member 10 side (sample 30 side). The base 21 is formed in the shape of a cantilever, and a rod-shaped member forming a protrusion 22 is provided at the tip of the cantilever. The hardening of the ink film surface is measured from the vibration characteristics of the cantilever.

The viscoelasticity measuring device further includes displacement sensors 50 and 60, a solenoid 70, a high-pressure amplifier 100, a displacement meter amplifier 110 and 120, a sine wave oscillation circuit 130, a converter 140, an LED drive circuit 200, and an LED. The irradiation time control circuit 210, the amplitude control circuit 220, the height control circuit 230, and the computer 300 are included.

In the viscoelasticity measuring device shown in FIG. 4, the viscoelasticity of the sample 30 is measured by vibrating the protrusion 22. The vibration of the protrusion 22 is performed by using an interpenetrating magnetic field generated by the solenoid 70. The amplitude of the protrusion 22 is captured by the displacement sensor 50. The exciting force by the solenoid 70 is proportional to the current. The viscoelasticity of the sample 30 can be obtained from the phase difference between the current of the solenoid 70 and the vibration (displacement) of the second member 20. That is, in the viscoelasticity measuring device according to the present embodiment, the second member 20 is vibrated while irradiating the sample 30 with ultraviolet rays from the irradiating device 40, the amplitude value of the second member 20 and the solenoid 70 which is a vibrating device. It is possible to continuously measure the viscoelasticity of the sample 30 based on the phase difference of the vibration of the second member 20 with respect to the output of. More specifically, the method for measuring viscoelasticity is as follows.

First, the sample 30 (liquid ink) is set on the flat plate-shaped first member 10. The second member 20 is installed on it. The second member 20 includes a base 21 and a protrusion 22 that projects toward the first member 10 and the sample 30 with respect to the base 21. An irradiation device 40 (UV irradiation device) is installed on the opposite side of the second member 20 with respect to the first member 10. The protrusion 22 is fixed to the base 21 as a cantilever. The base 21 has a flat plate shape. The base 21 and the protrusion 22 can vibrate along the direction parallel to the main surface direction of the base 21. The base 21 is made of a magnetic material and is vibrated by the magnetic force of a sine wave generated by the solenoid 70. The amplitude of the protrusion 22 is measured by the non-contact displacement sensor 50.

The base 21, the protrusion 22, the displacement sensor 60, and the solenoid 70 are fixed as an integral unit. The displacement sensor 60 is fixed at a position where the distance between the first member 10 and the protrusion 22 of the second member 20 can be measured. From this measured value, the film thickness of the sample 30 sandwiched between the first member 10 and the protrusion 22 can be grasped.

The first member 10 is driven in the direction of the arrow in the figure (up and down direction in FIG. 4). As a result, the distance between the first member 10 and the protrusion 22 is adjusted. This adjustment is made by a laminated piezo actuator (not shown) and a high pressure amplifier 100 that drives the actuator. The first member 10 can be adjusted to an arbitrary height position while observing the value of the displacement sensor 60.

The amplitude information of the protrusion 22 detected by the displacement sensor 50 is sent to the amplitude control circuit 220 via the displacement meter amplifier 110. The amplitude control circuit 220 controls the voltage applied to the solenoid 70 so as to keep the amplitude of the protrusion 22 at a predetermined value.

Information on the distance between the first member 10 and the protrusion 22 of the second member 20 detected by the displacement sensor 60 is sent to the height control circuit 230 via the displacement meter amplifier 120. The height control circuit 230 controls the high voltage amplifier 100.

The sine wave oscillation circuit 130 determines the frequency of vibration of the second member 20. Based on the sine wave generated in the sine wave oscillation circuit 130, the sine wave power for driving the second member 20 in the amplitude control circuit 220 is generated.

The LED irradiation time control circuit 210 generates signals of the irradiation timing and the irradiation time of the irradiation device 40 which is a UV LED. The LED drive circuit 200 generates electric power to drive the irradiation device 40 by obtaining a signal from the LED irradiation time control circuit 210. The UV irradiation time by the irradiation device 40 and the signal generation of the irradiation timing by the irradiation device 40 are controlled by the computer 300 via the (digital IO, AD) converter 140.

The operation of the viscoelasticity measuring device is controlled by the computer 300. The vibration signal of the second member 20 is amplified and processed (filtered) by the amplitude control circuit 220, and is taken into the computer 300 via the converter 140.

With the above configuration, the process of curing the sample 30 by the ultraviolet rays emitted from the irradiation device 40 appears as a change in the vibration of the second member 20, and the information can be collected by the computer 300.

(Measurement condition)
As an example, the base 21 is a thin plate having a thickness (t) of about 0.5 mm, and the cross-sectional shape of the protrusion 22 is a circle having a thickness of about φ1.0 mm. For example, the diameter of the cross section of the protrusion 22 is about φ0.2 mm or more and 5.0 mm or less. As an example, the protrusion 22 projects about 2 mm toward the first member 10 with respect to the base 21. For example, the protrusion amount of the protrusion 22 is about 0.5 mm or more and 5.0 mm or less.

As an example, the surface roughness of the tip surface of the protrusion 22 is Ra: 0.05 μm or more and 0.2 μm or less. Since the thickness of the sample 30 (ink) is about several μm, the surface roughness is preferably less than 1 μm. As the material of the protrusion 22, for example, stainless steel (SUS) can be used, but the material is not limited to this, and metals such as aluminum, iron and titanium, semi-rack and the like can also be used. However, the smaller the inertia of the protrusion 22, the higher the sensitivity for detecting viscoelasticity. Therefore, the material for the protrusion 22 is preferably a relatively lightweight material.

As an example, the vibration frequency of the protrusion 22 is about 50 Hz or more and 200 Hz or less. When the frequency is low, the measurement resolution of the curing rate decreases. In many cases, the higher the frequency, the greater the energy required to obtain the same amplitude. As a result, the decrease in amplitude accompanying the curing of the sample 30 is reduced, and the measurement sensitivity is reduced.

As an example, the amplitude of the protrusion 22 is about 2 μm or more and 20 μm or less (Peek to Peak). The film thickness of the sample 30 is about 0.2 μm or more and 100 μm or less.

The sample 30 to be measured is a UV-curable ink in which the main component is a monomer having a radically polymerizable double bond such as an acrylic acid ester, and the polymerization initiator is an aromatic ketone such as benzophenone or phenylphosphine oxide. Is.

Irradiation conditions of the ultraviolet ray by the irradiation device 40, for example, wavelength 395 nm, a degree irradiation energy 0.1 W / cm ² or more 5.0 W / cm ² or less. The irradiation device 40 is preferably an LED or LD whose power rises sharply.

(Measurement result)
FIGS. 5 to 7 show a measurement example in which the UV curable ink is cured by using the viscoelasticity measuring device described above.

In the example of FIG. 5, it can be understood that UV irradiation is started at 50 msec, and curing of the ink in contact with the tip of the protrusion 22 is started at around 150 msec. Curing of the ink is started from the irradiation device 40 side (the side opposite to the protrusion 22) and gradually progresses to the protrusion 22 side. From the results shown in FIG. 5, it is possible to easily estimate the curing rate of the sample 30.

In the measurement results shown in FIG. 5, the elasticity of the ink is increased and the protrusions 22 are less likely to vibrate, thereby capturing the curing. On the other hand, it is also possible to feed back the vibration amplitude to the amplitude control circuit 220 to control the amplitude of the protrusion 22 to be constant. In this case, the driving power required for vibration increases with curing. It is possible to monitor the progress of curing by capturing the driving voltage, current value, or change in phase between current and amplitude.

The measurement result shown in FIG. 6 also shows the process of attenuating the amplitude of the protrusion 22. In the example of FIG. 6, it is shown that the elasticity increases and the curing starts about 90 msec after the start of irradiation.

The measurement conditions of the result of FIG. 6 are sample 30: the above-mentioned UV curable ink, the film thickness of the sample 30: 24 μm, the UV irradiation energy by the irradiation device 40: 0.48 W / cm ² , and the UV wavelength: 395 nm.

In the measurement shown in FIG. 7, UV is irradiated after adjusting the ink film thickness, the vertical axis represents the time from the start of UV irradiation to curing, and the horizontal axis represents the ink film thickness. It should be noted that UV is irradiated in a substantially rectangular shape with a steep rise by the LED.

The measurement conditions of the result of FIG. 7 are: sample 30: the above-mentioned UV curable ink, UV irradiation energy by the irradiation device 40: 0.62 W / cm ² , UV wavelength: 395 nm, vibration frequency 100 Hz, amplitude: 5 μm (Peak to Peak). ).

As shown in FIG. 7, the larger the ink film thickness, the longer the curing time. According to the viscoelasticity measuring device according to the present embodiment, the ink film thickness can be freely adjusted and the curing time of each film thickness can be accurately estimated.

(Shape of protrusion)
8 to 12 are views showing an example of the second member 20. As shown in FIGS. 8 to 12, the shape of the protrusion 22 can be considered to be various. It is preferable that the tip of the protrusion 22 has a shape that easily sinks into the sample 30 and has a flat surface parallel to the main surface of the first member 10. This makes it easy to adjust the film thickness of the sample 30.

In each of the examples of FIGS. 8 to 12, the protrusion 22 is formed on a part of the surface of the base 21. The base 21 preferably has a shape that is easy to vibrate and hold. It is also required to have a shape that makes it easy to monitor vibration. From these viewpoints, the shape of the base 21 is determined.

In the example of FIG. 8, both the base 21 and the protrusion 22 are formed in a prismatic shape. In the example of FIG. 9, both the base 21 and the protrusion 22 are formed in a columnar shape. In the example of FIG. 10, the base 21 is formed in a plate shape, and the protrusion 22 is formed in a columnar shape. Here, the direction of the main surface of the base 21 is parallel to the direction of the main surface of the first member 10. In the example of FIG. 11, both the base 21 and the protrusion 22 are formed in a plate shape. In the example of FIG. 12, the base 21 is formed in a plate shape, and the protrusion 22 is formed in a columnar shape. Here, the direction of the main surface of the base 21 intersects the direction of the main surface of the first member 10 perpendicularly.

(Summary of measurement method)
The viscoelasticity measuring method using the above-mentioned viscoelasticity measuring device can be summarized as follows. As shown in FIG. 13, the viscoelasticity measuring method according to the present embodiment is a viscoelasticity measuring method capable of measuring the viscoelasticity of the sample 30, and the sample 30 is placed on the flat plate-shaped portion of the first member 10. The step of placing (S10), the step of bringing the protrusion 22 protruding toward the sample 30 in the second member 20 into contact with the sample 30 (S20), and the step of vibrating the first member 10 or the second member 20 (S30). , A step (S40) of collecting information on the amplitude of the vibrated first member 10 or the second member 20, and a step of measuring the viscoelasticity of the sample 30 based on the information of the amplitude collected in the step of collecting the information. (S50) and. As shown in FIG. 1, the sample 30 is irradiated with ultraviolet rays (electromagnetic waves) from the opposite side of the second member 20 with respect to the first member 10 through the transparent first member 10. The first member 10 or the second member 20 is vibrated while irradiating 30 samples with ultraviolet rays (electromagnetic waves) through the first member 10, and the amplitude value of the vibrated first member 10 or the second member 20 and the addition of vibration are applied. The viscoelasticity of the sample 30 is continuously measured based on the phase difference of the vibration of the first member 10 or the second member 20 with respect to the output of the shaking device.

Although the embodiments of the present disclosure have been described above, it should be considered that the embodiments disclosed this time are exemplary in all respects and are not restrictive. The scope of the present disclosure is indicated by the scope of claims, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims.

10 1st member, 20 2nd member, 21 base, 22 protrusions, 30 samples, 40 irradiation device, 50 displacement sensor (amplitude), 60 displacement sensor (distance), 70 solenoid, 100 high pressure amplifier, 110 displacement meter amplifier (amplitude) ), 120 displacement meter amplifier (distance), 130 sinusoidal oscillator circuit, 140 converter, 200 LED drive circuit, 210 LED irradiation time control circuit, 220 amplitude control circuit, 230 height control circuit, 300 computers.

Claims (22)

A viscoelasticity measuring device capable of measuring the viscoelasticity of a sample.
A first member including a flat plate-shaped portion on which the sample is placed, and
A second member including a protrusion that protrudes toward the sample and comes into contact with the sample.
A vibrating device capable of vibrating the first member or the second member,
It is provided with an information processing unit capable of collecting information on the amplitude of the vibrated first member or the second member when the first member or the second member is vibrated by the vibrating device.
A viscoelasticity measuring device that measures the viscoelasticity of the sample based on the amplitude information collected by the information processing unit. The flat plate-shaped portion of the first member is transparently formed.
A claim that the viscoelasticity measuring device is further provided on the opposite side of the second member with respect to the first member, and further includes an irradiation device capable of irradiating the sample with electromagnetic waves through the flat plate-shaped portion. The viscoelasticity measuring device according to 1. The viscoelasticity according to claim 1 or 2, wherein the viscoelastic device vibrates the first member or the second member with an amplitude in which a component affecting the curing of the sample is not taken into the sample from the atmosphere. Viscoelasticity measuring device. From claim 1, it is possible to insert the protrusion into the sample from a state in which the sample is sandwiched between the flat plate-shaped portion of the first member and the protrusion of the second member. The viscoelasticity measuring device according to any one of claims 3. From the state where the sample is sandwiched between the flat plate-shaped portion of the first member and the protrusion of the second member, the protrusion is moved in a direction away from the sample to adjust the film thickness of the sample. The viscoelasticity measuring apparatus according to any one of claims 1 to 4, wherein the viscoelasticity measuring apparatus can be used. The viscoelasticity measuring device according to any one of claims 1 to 5, wherein the tip of the protrusion has a plane parallel to the flat plate-shaped portion. The viscoelasticity measuring device according to any one of claims 1 to 6, wherein the viscoelastic device vibrates the second member of the first member and the second member. The viscoelasticity measuring device according to any one of claims 1 to 7, wherein the viscoelastic device vibrates the second member in parallel with the flat plate-shaped portion of the first member. The viscoelasticity measuring device according to any one of claims 1 to 8, wherein the area of the tip of the protrusion is smaller than the cross-sectional area of the sample as seen from the second member side. While irradiating the sample with ultraviolet rays from the irradiation device through the flat plate-shaped portion, the first member or the second member is vibrated by the vibration device, and the amplitude value of the first member or the second member is determined. Any one of claims 2 to 9, which continuously measures the viscoelasticity of the sample based on the phase difference of the vibration of the first member or the second member with respect to the output of the vibrating device. The viscoelasticity measuring device according to. The viscoelasticity measuring apparatus according to any one of claims 1 to 10, wherein an ultraviolet curable ink for an inkjet printing machine can be used as the sample. A viscoelasticity measuring method capable of measuring the viscoelasticity of a sample.
The step of placing the sample on the flat plate-shaped portion of the first member, and
A step of bringing a protrusion protruding toward the sample in the second member into contact with the sample,
The step of vibrating the first member or the second member,
A step of collecting information on the amplitude of the vibrated first member or the second member, and
A viscoelasticity measuring method comprising a step of measuring the viscoelasticity of the sample based on the amplitude information collected in the step of collecting the information. The viscoelasticity measuring method according to claim 12, wherein the sample is irradiated with an electromagnetic wave from the opposite side of the second member to the first member through the transparent flat plate-shaped portion of the first member. The viscoelasticity measuring method according to claim 12 or 13, wherein the first member or the second member is vibrated with an amplitude in which a component affecting the curing of the sample is not taken into the sample from the atmosphere. In the step of bringing the protrusion into contact with the sample, the protrusion is fitted into the sample from a state in which the sample is sandwiched between the flat plate-shaped portion of the first member and the protrusion of the second member. The viscoelasticity measuring method according to any one of claims 12 to 14, which comprises no. The step of bringing the protrusion into contact with the sample is a step in which the sample is sandwiched between the flat plate-shaped portion of the first member and the protrusion of the second member, and the protrusion is separated from the sample. The viscoelasticity measuring method according to any one of claims 12 to 15, which comprises moving to adjust the film thickness of the sample. The viscoelasticity measuring method according to any one of claims 12 to 16, wherein the first member and the second member are provided so that the tip of the protrusion has a plane parallel to the flat plate-shaped portion. .. The viscoelasticity measuring method according to any one of claims 12 to 17, wherein the second member of the first member and the second member is vibrated. The viscoelasticity measuring method according to any one of claims 12 to 18, wherein the second member is vibrated in parallel with the flat plate-shaped portion of the first member. The viscoelasticity measuring method according to any one of claims 12 to 19, wherein the sample is provided so that the cross-sectional area of the sample seen from the second member side is larger than the area of the tip of the protrusion. .. The first member or the second member is vibrated while irradiating the sample with ultraviolet rays through the flat plate-shaped portion of the first member, and the amplitude value of the first member or the second member vibrated. The viscoelasticity of the sample is continuously measured based on the phase difference of the vibration of the first member or the second member with respect to the output of the vibration device that applies the vibration, according to claims 13 to 20. The method for measuring viscoelasticity according to any one item. The viscoelasticity measuring method according to any one of claims 12 to 21, wherein an ultraviolet curable ink for an inkjet printing machine is used as the sample.

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