JP2862382B2 - Pressure-sensitive adhesive mixing control device and pressure-sensitive adhesive tape manufacturing method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a pressure-sensitive adhesive mixing control apparatus applied to a production line for applying a pressure-sensitive adhesive on a support and drying the same to produce a pressure-sensitive adhesive tape, and a method for manufacturing the pressure-sensitive adhesive tape.

[0002]

2. Description of the Related Art In a production line for applying a pressure-sensitive adhesive on a support and drying the pressure-sensitive adhesive tape to produce a pressure-sensitive adhesive tape, a device for controlling the mixing amount of a main material, which is a main raw material of the pressure-sensitive adhesive, and a curing agent has been used. Is provided.

FIG. 3 shows a configuration example of such a conventional mixing control device. That is, in the mixing tank 21a of the two-liquid mixer 21, a main agent supply pipe 22 for supplying the main agent is provided.
And a tip opening 23a of a hardening agent supply pipe 23 for supplying a hardening agent, and each of the pipes 22 and 23 has a storage tank (not shown) containing a main agent and a hardening agent. Drive pumps 24 and 25 for feeding the mixture into the mixing tank 21a are provided respectively. In the middle of each of the pipes 22 and 23, flow meters 26 and 27 for measuring the flow rates of the main agent and the curing agent are provided, respectively.

A long support 29 serving as a base for an adhesive tape is wound around a drive roller 28 rotatably supported by a line main body (not shown).
Numeral 9 is configured to run at a predetermined speed in the direction of arrow A in the drawing by the rotational driving of the drive roller 28. The outlet 21 b of the two-liquid mixing tank 21 is provided toward a supply tank 30 that supplies an adhesive 32 in which a main agent and a curing agent are mixed onto a support 29. Although not shown, a take-up roller for winding the adhesive tape is provided on the front side of the arrow A, and a support supply roller for supplying the support 29 to the drive roller 28 is provided on the rear side. ing.

Above the driving roller 28, an adhesive supply roller 31 for supplying the adhesive 32 stored in the supply tank 30 to the support 29 at a predetermined thickness is rotatably provided. The pressure-sensitive adhesive 32 is applied to the support 29 to a predetermined thickness by the rotation of the pressure-sensitive adhesive supply roller 31.

On the other hand, each output of the flow meters 26 and 27 is guided to a control unit 34 composed of a microcomputer.
Each control output from the control unit 34 is guided to each corresponding drive pump 24, 25.

In the above configuration, the control unit 34 stores in advance reference mixing ratio data indicating the optimum mixing ratio between the main agent and the curing agent, and the control unit 34 controls the flow meters 26 and 27.
The mixing ratio is calculated based on the flow rate of the main agent and the flow rate of the curing agent measured by the above method. And
Each of the drive pumps 24, 25 is set so that the calculated mixture ratio data becomes equal to the reference mixture ratio data stored therein.
Is controlled.

[0008]

As described above, in the above-described conventional mixing control device, the supply of each liquid can be stabilized by controlling the flow rate of the main agent and the curing agent. ing.

However, when the quality of the curing agent is inadequate (for example, when impurities are mixed in the curing agent and the reactivity with the main agent is lost, the expiration date of the curing agent expires and the curing agent deteriorates. If a liquid other than the curing agent is accidentally used as the curing agent, the specified amount of the curing agent will not be mixed into the adhesive after mixing. However, there is a problem that it is not possible to detect a defect due to such a defect in the quality of the curing agent.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to perform a quantitative analysis of a curing agent after preparing a pressure-sensitive adhesive by mixing a main agent and a curing agent, thereby to improve the quality of the curing agent. An object of the present invention is to provide a mixing control device and a method for manufacturing an adhesive tape, which can surely prevent the occurrence of a defect due to the above.

[0011]

Means for Solving the Problems In order to solve the above problems, a mixing control apparatus of the present invention is an apparatus used in a production line for applying a pressure-sensitive adhesive on a support and drying it to produce a pressure-sensitive adhesive tape. The main agent and the curing agent are mixed at an appropriate ratio to prepare the pressure-sensitive adhesive, and a liquid mixer for coating the pressure-sensitive adhesive on the support, and the determination of the curing agent contained in the pressure-sensitive adhesive. Quantitative analysis means for performing analysis, and control means for controlling the mixing ratio of the main agent and the curing agent supplied to the liquid mixer based on the quantitative data of the curing agent analyzed by the quantitative analysis means. Configuration.

Further, the method for producing a pressure-sensitive adhesive tape according to the present invention comprises the steps of: preparing a pressure-sensitive adhesive by mixing a main agent and a curing agent at an appropriate ratio in a liquid mixer; A coating step of coating the prepared pressure-sensitive adhesive on a support, wherein the pressure-sensitive adhesive is included in the pressure-sensitive adhesive between the pressure-sensitive adhesive preparation step and the coating step or after the coating step A quantitative analysis step of quantitatively analyzing the curing agent by near-infrared spectroscopy, and controlling a mixing ratio of the main agent and the curing agent supplied to the liquid mixer based on quantitative data of the curing agent analyzed by the quantitative analysis step And a control step to perform

[0013]

The quantitative analysis means performs a quantitative analysis of the curing agent supplied to the liquid mixer, and supplies a quantitative amount of the curing agent obtained by the analysis to the control means. In the control means, data indicating the optimum mixing ratio of the main agent and the curing agent is stored in advance with a certain width, and the control means obtains from the quantification of the curing agent obtained by quantitative analysis. The supply amount of the curing agent to the liquid mixer, or the supply amount of the main agent to the liquid mixer, or both, so that the mixing ratio between the main agent and the curing agent falls within the range of the stored mixing ratio data. Control.

Thus, even when impurities are mixed in the hardener supplied to the liquid mixer, for example, only the hardener excluding the impurities can be quantified. It becomes possible to manufacture a tape.

In the pressure-sensitive adhesive preparation step, the main agent and the curing agent are mixed at an appropriate ratio in a liquid mixer to prepare a pressure-sensitive adhesive and supply it to the coating step. In the coating step, the pressure-sensitive adhesive prepared in the pressure-sensitive adhesive preparation step is coated on a support to produce a pressure-sensitive adhesive tape.

In the step of manufacturing such an adhesive tape, a quantitative analysis step and a control step are always added between the step of preparing the adhesive and the step of coating or after the step of coating, so that a predetermined amount of the curing agent is always added. Is controlled to be mixed into the main agent.

That is, in the quantitative analysis step, the hardener contained in the pressure-sensitive adhesive prepared in the pressure-sensitive adhesive preparation step is quantitatively analyzed by a near-infrared spectrometer, and the quantitative determination of the hardener obtained by this analysis is performed in the control step. To supply. In the control step, based on the optimal mixing ratio data of the main agent and the curing agent prepared in advance, the mixing ratio of the main agent and the curing agent obtained from the quantitative analysis of the curing agent obtained by the quantitative analysis is within the range of the mixing ratio data. The mixing ratio between the main agent and the curing agent is controlled so as to be within.

[0018]

An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is an external view of a production line to which the mixing control device of the present invention is applied. In the figure, 1 is a two-liquid mixer, 2 and 3 are pipes, 4 and 5 are drive pumps, 8 is a drive roller, 9 is a support, 10 is a supply tank, 11 is an adhesive supply roller, and 12 is an adhesive. Since these components are the same as those of the above-described conventional mixing control device, only the reference numerals will be given here, and description thereof will be omitted.

The mixing control device according to the present invention, having the above-mentioned configuration, comprises a near-infrared spectrometer (quantitative analysis means) 15 and a drive pump 5 for supplying a curing agent based on the output of the near-infrared spectrometer 15. And a control unit 16 for controlling the driving of the measurement unit 15 a connected to the near-infrared spectrometer 15.
Is provided at the outlet 1b of the two-liquid mixer 1. It is assumed that the control unit 16 stores calibration curve data described later.

That is, in the present embodiment, the flow meters 26 and 27 are removed from the conventional mixing control device, and the near-infrared spectrometer 15 is newly added.

The near-infrared spectrometer 15 irradiates light at the measuring section 15a, and emits near-infrared light (wavelength region) obtained from the object to be measured (in this case, an adhesive in which a main agent and a curing agent are mixed). (0.6 to 2.5 μm) is continuously separated by a diffraction grating to obtain a light scattering absorption spectrum. Therefore, a number of samples in which the mixing ratio of the curing agent to the main agent is variously changed are prepared, and the light scattering absorption spectrum of each sample is measured, and the wavelength (A) at which the absorption amount of the spectrum changes is changed. By detecting the no wavelength (B), the control unit 16
The ratio of the absorbance of the wavelength (A) to the absorbance of the wavelength (B) is determined for each sample, and various mixing ratio data (calibration curve data) of the main agent and the curing agent are created based on these ratios. The control unit 16 previously stores the mixture ratio data created in this way before controlling the operation of the apparatus.

Next, the operation of the mixing control device configured as described above will be described in the order of each step of manufacturing the adhesive tape.

During the operation of the production line to which the present mixing control device is applied, the drive pumps 4 and 5 of the respective pipes 2 and 3 adjust the flow rates of the respective pipes 2 and 3 to an initial value by a control signal from the controller 16. The mixing ratio is controlled so as to be adjusted.

[Adhesive Preparation Step] The main agent and the curing agent whose flow rates are controlled as described above are supplied to the two-liquid mixer 1 through the pipes 2 and 3, respectively, and are uniformly mixed to form the adhesive 12 Is created. And this created adhesive 12
Is supplied to the supply tank 10 through the outlet 1b of the two-liquid mixer 1.

[Quantitative Analysis Step] In this state, the near-infrared spectrometer 15 measures the light scattering absorption spectrum of the near-infrared adhesive irradiated by the measuring unit 15a at the outlet 1b of the two-liquid mixing tank 1. Then, the measurement data is sent to the control unit 16.

[Control Process] The control unit 16 quantifies the amount of the curing agent from the mixture ratio data (calibration curve data) stored therein based on the measurement data from the near-infrared spectrometer 15. Then, the determined amount of the curing agent (that is, the mixing ratio with the main agent) is stored in the reference mixing ratio data (the data is the optimum mixing ratio between the main agent and the curing agent based on the calibration curve data). When the data is set to have a certain width.), It is determined that the mixing ratio of the main agent and the curing agent is good, and the control of the drive pumps 4 and 5 is performed in the same manner as before. To maintain. If the determined amount of the curing agent (that is, the mixing ratio with the main agent) is higher than the upper limit of the reference mixing ratio data set therein, the amount of the curing agent with respect to the main agent is large. Because it is too long, the control unit 16 controls the drive of the drive pump 5 so that the flow rate of the curing agent is reduced and the amount of the curing agent falls within the range of the reference mixture ratio data. On the other hand, when the determined amount of the curing agent (that is, the mixing ratio with the main agent) is lower than the lower limit of the range of the reference mixing ratio data set therein, the amount of the curing agent with respect to the main agent is small. Because it is too long, the control unit 16 controls the drive of the drive pump 5 by increasing the flow rate of the curing agent so that the amount of the curing agent falls within the range of the reference mixture ratio data.

Thus, even if impurities are mixed in the hardener supplied to the two-component mixer 1, for example, only the hardener excluding the impurities can be quantified. It becomes possible to manufacture an adhesive tape.

[Coating Step] The adhesive 12 in which the main agent and the curing agent are mixed at the optimum ratio in this manner is sent out from the supply tank 10 by a predetermined amount by the rotation of the adhesive supply roller 11, and is wound. It is applied to a predetermined thickness on the support 9 wound at a constant speed by the take-up roller.

Thereafter, the pressure-sensitive adhesive tape having the pressure-sensitive adhesive 12 applied on the support is sequentially wound on a winding roller through a drying step, although not shown.

FIG. 2 shows another embodiment of the mixing control device according to the present invention.
Are arranged to face the adhesive 12 after being coated on the support 9. However, even if the near-infrared spectrometer 15 is arranged in this manner, its operation is the same as that of the above-described embodiment, and the description of the operation is omitted here.

The manufacturing process at this time is in the order of an adhesive preparation process, a coating process, a quantitative analysis process, and a control process.

In the above embodiment, only the driving pump 5 for supplying the curing agent is controlled based on the quantitative data from the near-infrared spectrometer 15, but the driving for supplying the main agent is performed. The drive control of only the pump 4 is possible, and the drive control of both the drive pump 5 for supplying the curing agent and the drive pump 4 for supplying the main agent is also possible. .

[0034]

According to the mixing control device and the method for producing an adhesive tape of the present invention, the mixing ratio of the adhesive supplied to the liquid mixer is controlled based on the quantitative data of the curing agent analyzed by the quantitative analysis. Even if impurities are mixed in the curing agent, for example, even if impurities are mixed in the curing agent, it is possible to measure only the curing agent excluding the impurities, so that it is possible to always manufacture an adhesive tape mixed with a specified amount of the curing agent. This has the effect of stabilizing the quality.

[Brief description of the drawings]

FIG. 1 is an external view of a production line to which a mixing control device according to the present invention is applied.

FIG. 2 is an external view showing another embodiment of the mixing control device of the present invention.

FIG. 3 is an external view of a production line to which a conventional mixing control device is applied.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Two-liquid mixer 2, 3 Piping 4, 5 Drive pump 9 Support body 12 Adhesive agent 15 Near-infrared spectrometer 16 Control part

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁶ Identification code FI B05D 7/24 301 B05D 7/24 301P

Claims (2)

(57) [Claims] 1. An apparatus used in a production line for applying a pressure-sensitive adhesive on a support and drying the pressure-sensitive adhesive tape to produce a pressure-sensitive adhesive tape, wherein the main agent and the curing agent are mixed at an appropriate ratio to form the pressure-sensitive adhesive. A liquid mixer for preparing and applying the adhesive on the support, a quantitative analyzer for performing a quantitative analysis of the curing agent contained in the adhesive, and a curing agent analyzed by the quantitative analyzer. A mixing control device, comprising: control means for controlling a mixing ratio between a main agent and a curing agent supplied to the liquid mixer based on quantitative data. 2. A pressure-sensitive adhesive preparation step in which a main agent and a curing agent are mixed at an appropriate ratio in a liquid mixer to prepare a pressure-sensitive adhesive, and the pressure-sensitive adhesive prepared by the pressure-sensitive adhesive preparation step is coated on a support. In the method of manufacturing a pressure-sensitive adhesive tape comprising a coating step of processing, between the pressure-sensitive adhesive preparation step and the coating step or after the coating step, near-infrared spectroscopic analysis of the curing agent contained in the pressure-sensitive adhesive A quantitative analysis step for quantitative analysis by
Producing a pressure-sensitive adhesive tape, comprising: a control step of controlling a mixing ratio of a main agent and a curing agent supplied to the liquid mixer based on quantitative data of the curing agent analyzed by the quantitative analysis step. Method.