JPH08266878A - Continuous liquid mixer - Google Patents

Abstract

PURPOSE: To maintain an exact mixing ratio and to allow occasional change to arbitrary transportation rates by comparing the set values of respective components corresponding to the fluctuation in the supply rate of a liquid mixture and the actual supply rates detected by flow meters in the case plural kinds of the liquid components varying in viscosity are continuously mixed. CONSTITUTION: A uncross-linked compsn. of an acrylic system having a viscosity of 10000cPs is supplied from a liquid supply tank 11 by a constant feeding pump 2 consisting of, for example, a precision gear pump and a hardener having a viscosity of 10cPs is supplied from a liquid supply tank 12 by a constant supplying pump 22 consisting of a triplet plunger pump to this continuous liquid mixer 3 which handles plural kinds of the liquids varying in viscosity and having a mixing ratio of >=30 times. The actual supply rates before the change detected by the flow meters installed to the pumps 21, 22 and the set supply rate after the change are compared when the line speed of, for example, a coater is changed. A feedback instruction is made to the respective pumps 21, 22 to adjust the supply rates in such a manner that the difference therebetween is diminished.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a continuous liquid mixing apparatus.

[0002]

2. Description of the Related Art As an apparatus for continuously mixing plural kinds of liquids having different viscosities and different mixing ratios, plural kinds of liquids transported from a fixed quantity supply device set to a predetermined ratio are mixed in a mixing device. In-line mixers that supply and continuously mix at a constant ratio are known.

However, the in-line mixer is suitable for mixing a plurality of liquids having a small mixing ratio difference even if the viscosity is slightly different, but the viscosity is different and the mixing ratio is 3%.
In the case of multiple types of liquids that are 0 times or more and are difficult to mix, or in the case of a mixed liquid having a gradual reactivity, the mixing ratio of the obtained mixed liquid varies, and it is difficult to maintain stable process quality. In these processes, it cannot be said that it is an optimum mixing device.

For the same purpose, Japanese Patent Application Laid-Open No. 52-26619 discloses a continuous automatic liquid compounding apparatus using an injection nozzle for forming a liquid pressure according to Bernoulli's theorem. However, on the contrary, in principle, various factors for the liquid viscosity and the liquid pressure fluctuation fluctuate during the continuous working time in the workplace, and as a result, the mixing ratio becomes uneven, and in particular, the mixing ratio is 30 times or more. In the case of multiple kinds of liquids that are difficult to mix, the tendency becomes more remarkable.

[0005]

DISCLOSURE OF THE INVENTION The inventors of the present invention have diligently studied the cause of the variation in the mixing ratio after mixing when changing the discharge amount of a continuous automatic compounding device, and as a result, from the above-mentioned fixed amount supply pump to the above-mentioned in-line mixer. The fluid pressure to be supplied depends on the flow velocity, viscosity, etc. of the above liquids, and depending on the mixing ratio and the viscosity difference between the liquids, the fluid pressures of multiple types of liquids can always maintain the same pressure relationship when the flow rate is changed. Instead, the load applied to the pump will be different for each liquid, and the discharge efficiency of the pump will also change depending on the viscosity of the liquid and the back pressure on the output side of the pump. We have found that it is impossible to change the flow rate at any time by keeping the blending ratio constant only by means of transportation.

The present invention has been made in view of the above facts, and an object thereof is to prepare a plurality of liquids having different viscosities and having a mixing ratio of 30 times or more, which are difficult to mix. It is an object of the present invention to provide a liquid continuous mixing device with an accurate mixing ratio and which can be arbitrarily changed to any transport amount.

[0007]

The present invention according to claim 1 is an apparatus for continuously mixing a plurality of types of liquid components having different viscosities and a mixing ratio of 30 times or more, and supplying the mixed liquid. A liquid continuous mixing device characterized by having a control means for comparing the set value of each component corresponding to the amount fluctuation and the actual supply amount detected by the flow meter, and instructing and adjusting the difference to each metering pump. ,

The present invention according to claim 2 has different viscosities,
In addition, it is a device for continuously mixing a plurality of types of liquid components with a mixing ratio of 30 times or more, and compares the set value of one component corresponding to the fluctuation of the supply amount of the mixed liquid with the actual supply amount detected by the flow meter. Then, the difference is instructed to the metering pump and adjusted, and an instruction to adjust the actual supply amount supplied from another metering pump at a constant mixing ratio with the component to the changed set value is used for the other metering. A liquid continuous mixing device having a control system for supplying to a pump is its gist.

In the present invention as set forth in claim 1, an apparatus for comparing the supply amount, which is changed at any time, with the set value and the actual supply amount detected by the flow meter is a number corresponding to a plurality of types of liquids to be mixed. A device is provided, which comprises a fixed amount supply pump corresponding to the number of the devices, a flow meter, and a control device for controlling these.

In the present invention as set forth in claim 2, there is only one device for comparing the supply amount that is changed at any time with the set value and the actual supply amount detected by the flow meter. Composed of equipment.

The above-mentioned fixed amount supply pump is, for example, a precision gear pump, a triple plunger pump, etc.
A pump having a high discharge efficiency is preferably used, and the signal of the actual supply amount detected by the flow meter can proportionally increase and decrease the flow rate and can accurately ensure the set flow rate.

The liquid continuous mixing device is not particularly limited as long as it has a sufficient dispersion ability at the maximum flow rate in the flow rate range to be used, but a sufficient shearing force is applied to the liquid substance to be mixed. An in-line mixer is preferably used in which the feed stream provided is formed.

As the above-mentioned in-line mixer, for example, Japanese Patent Application No. 6-247557 filed previously by the present inventors.
No. "a rotor is provided with a disk portion projecting in the radial direction in the middle of the length of the main shaft of the rotor, and a plurality of stirring blades are arranged on the outer circumference of the main shaft." Can be mentioned.

In the present invention according to claim 1, the control means for comparing the supply amount changed at any time with the set value and the actual supply amount detected by the flow meter, and controlling the same to the changed set value, , For example, a discharge amount Q (x) of the liquid continuous mixing device corresponding to a line speed V (x) of a device using a mixture such as a coating device, and a supply amount R of a fixed amount supply pump.
(X), S (x), ... Are set by a function of the line speed V (x) of the coating apparatus, and the line speed V (x) of the coating apparatus is from x ₁ to x. When changed to ₂ , the supply amount R (x), S of the above-mentioned fixed amount supply pump
(X), ... Represents the actual supply amount R at the line speed x ₁ before the change of the coating device detected by the metering devices _Tr , T _s , ... (X ₁ ), S
(X ₁ ), ... And the set supply amount R (x ₂ ), S (x ₂ ), ... When the changed line speed is x ₂ are compared, the difference is calculated, and the difference is calculated. It constantly has a function of giving a feedback instruction to the constant amount supply pump so as to make the value smaller and adjusting it.

In the present invention as set forth in claim 2, the control means compares the supply amount changed at any time with a set value and an actual supply amount detected by the flow meter, and controls the set supply amount to the changed set value. Is the line speed V (x) of the above coating device
However, when x ₁ is changed to x ₂ , the actual supply amount R (x ₁ ) at the line speed x ₁ before the change of the coating device detected by one meter attached to the constant amount supply pump, Or S
(X ₁ ) or ..., and the changed line speed x ₂
Function to compare the set supply amount R (x ₂ ), S (x ₂ ), and so on, calculate the difference, and give a feedback instruction to each fixed-quantity supply pump to reduce the difference and adjust It always has.

Since the control means is equipped as described above, there is no change in the line speed V (x ₁ ) of the coating apparatus, and the supply amount R (x ₃ ) of the constant amount supply pump due to changes in environmental conditions. , S (x ₃ ), ..., To ensure the discharge amount Q (x ₁ ) of the liquid continuous mixing device corresponding to the line speed V (x ₁ ) of the coating device. , The supply amount R (x), S of the above-mentioned fixed amount supply pump
(X), ... Are detected by metering devices T _r , T _s , ... Attached to the fixed amount supply pump, respectively, and the actual supply amounts R (x ₃ ) and S (x _{3 of the} fixed amount supply pump are detected. ), ..., And set supply amount R (x ₁ ), S (x ₁ ) ,.

[0017]

The liquid continuous mixing apparatus of the present invention according to claim 1 is
For a plurality of types of liquids having different viscosities and a mixing ratio of 30 times or more, the set value of each component corresponding to the changed amount of the mixed amount is compared with the actual supply amount detected by the flow meter, and the difference is determined. Since it has a control means for instructing and adjusting each metering pump, even if the properties of a plurality of types of liquids differ greatly when changing to an arbitrary transport amount, it is provided for each component of a plurality of types. Based on the actual feed rate detected by the flow meter, the metering pumps provided for each can be instructed the feed rate set according to the mixing ratio at the changed flow rate, and continuous mixing at an accurate mixing ratio is possible. You can

In the liquid continuous mixing apparatus according to the second aspect of the present invention, a plurality of types of liquids having different viscosities and a mixing ratio of 30 times or more are set as a set value of one component corresponding to the change of the supply amount. The actual supply amount detected by the flow meter is compared, the difference is instructed to the metering pump and adjusted, and the actual supply amount supplied from another metering pump at a constant mixing ratio with the component is changed. Since it has a control system that gives an instruction to adjust to a value to the above other fixed amount pumps, when changing to any transport volume at any time, the actual supply detected by one meter attached to the fixed amount supply pump Based on the amount, a fixed amount supply pump provided for each can be instructed a supply amount set according to a mixing ratio at a changed flow rate, and continuous mixing can be performed at an accurate mixing ratio.

In the liquid continuous mixing apparatus of the present invention, there is no change in, for example, the line speed of the apparatus for using the mixture connected to the liquid continuous mixing apparatus, and the supply amount of the fixed amount supply pump is changed due to the change of environmental conditions. Even in such a case, the amount of the mixture used by the above-mentioned apparatus used, the set amount of the fixed amount supply pump based on this, and the actual supply of the fixed amount supply pump detected by the meter attached to each fixed amount supply pump. Since the amounts are compared and adjusted, it is always possible to continuously mix in the correct mixing ratio.

[0020]

Embodiments of the present invention will be described below.

(Embodiment 1) 11 and 12 in FIG.
Is a liquid supply tank, in which the liquid non-crosslinked acrylic composition is stored in the liquid supply tank 11, and the curing agent is stored in the liquid supply tank 12. Reference numeral 21 is a constant quantity supply pump including a precision gear pump, and from the liquid supply tank 11,
The acrylic uncrosslinked composition having a viscosity of 10,000 cps is supplied to the mixing device 3. Reference numeral 22 denotes a fixed quantity supply pump including a triple plunger pump, and the liquid supply tank 12
From the above, a curing agent having a viscosity of 10 cps is supplied to the liquid continuous mixing device 3.

Reference numerals 41 and 42 denote the above-mentioned fixed amount supply pump 21.
And 22 are Coriolis mass flowmeters arranged in series, and 5 is a control means. The control means takes in a signal proportional to the coating speed of the coating device 6, and discharges Q (x) of the liquid continuous mixing device corresponding to the proportional signal and supply amount R (x) of the constant amount supply pump. , S (x), ...
It is set by a function of the line speed V (x) of the coating apparatus, and the line speed V (x) of the coating apparatus is
When the x ₁ is changed to x _2, feed rate of the metering pump R (x), S (x ), but each the constant amount is attached to the supply pump and meter T _r, T _s is detected Line speed x ₁ before the line speed of the coating equipment is changed
Actual supply amount R (x ₁ ), S (x ₁ ) and set supply amount R (x ₂ ), S (x ₂ ) at changed line speed x ₂
It always has a function of comparing and calculating the difference, and giving a feedback instruction to the constant amount supply pump so as to reduce the difference, and adjusting.

A 100 μm-thick casting vinyl chloride resin film is used as the base film used in the production of the acrylic pressure-sensitive adhesive tape, and the acrylic uncured composition and the acrylic pressure-sensitive adhesive comprising the curing agent are used as the pressure-sensitive adhesive. Was used. For the time being, the acrylic adhesive did not substantially contain nitrogen atoms, and a polyisocyanate compound was used as a curing agent.

The viscosity of the acrylic non-crosslinked composition used for producing the acrylic pressure-sensitive adhesive is 10,000 cps, and the viscosity of the curing agent of the acrylic non-crosslinked composition is
It is 10 cps, and the mixing ratio of the acrylic uncrosslinked composition and its curing agent is 100: 0.5 (weight ratio).

The above acrylic pressure-sensitive adhesive component was discharged in the above in-line mixer at a temperature of 35 ° C. and a stirring mixer rotation speed of 1800 rpm at a discharge rate of 1 kg / min and 5 kg / min.
10 cycles 3 at 3 levels of min and 10 kg / min
After mixing 0 times, these were sent to the above coating apparatus, and the production test of the pressure-sensitive adhesive sheet was continuously performed with the thickness of the pressure-sensitive adhesive layer after drying being 35 μm and the coating width being 1000 mm. Each stage (30
The amount of nitrogen contained in the unit weight of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet was analyzed by elemental analysis to measure the mixed state of the acrylic uncrosslinked composition and the curing agent. Table 1 shows the measurement results.

The nitrogen atom contained in the adhesive layer is
Since only those derived from the polyisocyanate group in the curing agent, the mixed state of the acrylic uncrosslinked composition and the curing agent can be evaluated from the variation in the amount of nitrogen contained in the pressure-sensitive adhesive layer.

[0027]

[Table 1]

(Embodiment 2) Before changing the line speed of the coating apparatus, the control means detects the metering unit T _s attached to the fixed-quantity supply pump for one curing agent component of the acrylic pressure-sensitive adhesive before changing the line speed. Actual supply amount S (x ₁ ) at line speed x ₁
When setting the time line speed x ₂ after the change the supply quantity R (x
₂ ) and S (x ₂ ) are compared, the difference between them is calculated, a feedback instruction is given to the fixed amount supply pump so as to reduce the difference, and a conversion signal based on a predetermined mixing ratio is converted into an acrylic signal by the feedback instruction signal. The production test of the pressure-sensitive adhesive sheet was continuously carried out in the same manner as in Example 1 except that the pump having a constant feed function for the uncrosslinked composition component constant feed pump was instructed to feed back.

The amount of nitrogen contained in the unit weight of the pressure-sensitive adhesive layer of the obtained pressure-sensitive adhesive sheet at each stage (30 times) was analyzed by elemental analysis in the same manner as in Example 1 to cure the acrylic uncrosslinked composition and cure. The mixed state of the agent was measured. The measurement results are shown in Table 2.

[0030]

[Table 2]

(Comparative Example 1) The two kinds of liquid components to be mixed are the same as those in the embodiment, and as the mixing apparatus used, the above liquid components are respectively supplied from the respective liquid supply tanks to the in-line mixer by the constant amount supply pump. Detects the difference between the usage amount and the supply amount of the mixed liquid from the point (applicator), and discharges (circulates the liquid component to the inline mixer) / circulation of the three-way valve provided for each liquid component in the inline mixer. (Stop the supply of liquid components to the in-line mixer and return to the liquid supply tank) is switched, and the operation is performed using the conventional intermittent type, constant flow rate mixer that controls the supply of the mixed liquid from the in-line mixer. Example 1
The production test of the pressure-sensitive adhesive sheet was continuously performed in the same manner as in.

The amount of nitrogen contained in the unit weight of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive sheet obtained during the time when the above-mentioned mixing device was operated at the set mixing rate of 10 kg / min was analyzed by elemental analysis in the same manner as in Example 1. The mixture was analyzed and the mixed state of the acrylic uncrosslinked composition and the curing agent was measured. The measurement results are shown in Table 3.

[0033]

[Table 3]

[0034]

Since the liquid continuous mixing apparatus of the present invention is constructed as described above, even if the properties of a plurality of types of liquids are greatly different when the amount of transportation is changed to any desired amount, A device using a mixture connected to a liquid continuous mixing device, for example, even if the line speed is not changed and the supply amount of the constant amount supply pump is changed due to a change in environmental conditions, the mixture of the above-mentioned device is always used. Since the amount of water used and the set amount supply amount of the above-mentioned fixed amount supply pump based on this and the actual supply amount of the fixed amount supply pump detected by the meter attached to each fixed amount supply pump are compared and adjusted, it is always accurate. It is possible to continuously mix at various mixing ratios.

[0035]

[Brief description of drawings]

FIG. 1 is a flow chart for explaining a process for producing a pressure-sensitive adhesive sheet using the liquid continuous mixing device of the present invention.

[Explanation of symbols]

 11, 12 Liquid supply tank 21, 22 Fixed amount supply pump 3 Liquid continuous mixing device 41, 42 Flow meter 5 Control means 6 Coating device

Claims (2)

[Claims] 1. A device for continuously mixing a plurality of types of liquid components having different viscosities and having a mixing ratio of 30 times or more, wherein a set value of each component corresponding to fluctuations in the supply amount of the mixed liquid and a flow meter. The continuous liquid mixing device is characterized by having a control means for comparing the actual supply amount detected by the above, and instructing and adjusting the difference to each metering pump. 2. A device for continuously mixing a plurality of types of liquid components having different viscosities and having a mixing ratio of 30 times or more, wherein a set value of one component corresponding to fluctuations in the supply amount of the mixed liquid and a flow meter. Compared with the actual supply amount detected by, the difference is instructed to the metering pump and adjusted, and the actual supply amount supplied from another metering pump at a constant mixing ratio with the component is changed to a set value. 2. A liquid continuous mixing device comprising a control system for giving an instruction to adjust to the other metering pump.