TW202140150A - Extrusion method - Google Patents

Abstract

Provided is an extrusion method using a die having a slot for discharging a fluid therethrough, the method including an adjusting step of adjusting the height of the slot to adjust the thickness of a discharged product discharged through the slot. The adjusting step includes a step of determining the height of the slot, in which a thickness d_1n at position n among arbitrary positions 1 to N in a direction orthogonal to a flowing direction of the discharged product is calculated with a specific formulae (1) and (2), to make small a difference e = {e₁ … e_N } between a calculated thickness d₁ = {d₁₁ … d_1N } calculated with a specific formula (3) and a reference thickness d_ref = {d_ref1 … d_refN }.

Description

Extrusion method

The present invention relates to an extrusion method.

In the past, mold nozzles formed with slots for ejecting fluid were used to manufacture various products. For example, a coating device called a coater equipped with the aforementioned die nozzle is used to form a coating film on the surface of a film or the like. In addition, in order to extrude the molten resin into a film shape, a die nozzle called a T die nozzle is used to manufacture a film.

The manufacturing method using the die nozzle includes a step for adjusting the thickness of the ejected material ejected from the above-mentioned slot to a desired value. For example, Patent Document 1 describes a manufacturing method that includes an adjustment step of adjusting the height of the slit in order to adjust the thickness of the ejected material ejected from the slit. [Prior Technical Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Application Publication No. 2006-346649

[The problem to be solved by the invention]

However, in the past, the adjustment of the thickness of the ejected material was based on the operator's intuition, and there was a problem that it was difficult to adjust the ejected material to the desired thickness. Specifically, there is a problem in that when the height of the slot at a position corresponding to the thickness is adjusted in order to change the thickness of a part of the ejection to a desired value, the thickness is within the range of the slot Other locations have also changed. That is, even if the thickness of a part of the ejected material is adjusted to a desired thickness, the thickness of the other part that does not need to be changed also changes. In addition, in the extrusion method using the die nozzle, not only the thickness of the ejected product must be made uniform, but also the thickness of the ejected product must be locally changed. In this case, the problem of thickness adjustment also occurs.

In view of the above-mentioned problems, the subject of the present invention is to provide an extrusion method that can relatively easily and accurately adjust the thickness of the ejected product. [Technical means to solve the problem]

The inventors of the present invention conducted painstaking research and found that before and after adjusting the height of the slot, the amount of change in the height of the slot is in a proportional relationship with the amount of change in the thickness of the ejected material, thus completing the present invention.

d_1n ：調節後之上述噴出物之計算厚度d₁ =｛d₁₁ ...d_1N ｝於位置n處之值 d_1ave ：d₁ =｛d₁₁ ...d_1N ｝之平均值 K：比例常數 h_1n ：假想之調節後之上述狹槽之高度h₁ =｛h₁₁ ...h_1N ｝於位置n處之值 h_1ave ：h₁ =｛h₁₁ ...h_1N ｝之平均值 h_0n ：調節前之上述狹槽之高度h₀ =｛h₀₁ ...h_0N ｝於位置n處之值 h_0ave ：h₀ =｛h₀₁ ...h_0N ｝之平均值 d_0n ：調節前之上述噴出物之厚度d₀ =｛d₀₁ ...d_0N ｝於位置n處之值 d_0ave ：d₀ =｛d₀₁ ...d_0N ｝之平均值 v：上述流體物之黏性指數 [數式2]

e_n ：上述差e=｛e₁ ...e_N ｝於位置n處之值 d_refn ：上述噴出物之厚度之目標值d_ref =｛d_ref1 ...d_refN ｝於位置n處之值The present invention provides an extrusion method that uses a die nozzle forming a slot for ejecting a fluid. The extrusion method includes adjusting the thickness of the ejected object from the slot. The height adjustment step, the above adjustment step includes the following steps: use the following formula (1) and formula (2) to calculate the position of any position 1 to position N in the direction orthogonal to the flow direction of the spray The thickness d _1n at n is calculated by the following formula (3), the calculated thickness d ₁ = {d ₁₁ ... d _1N } and the target value of thickness d _ref = {d _ref1 ... d _refN } The difference e={e ₁ ...e _N } is reduced to determine the height of the above-mentioned slot. [Numerical formula 1]

d _1n : the calculated thickness of the above-mentioned ejected material after adjustment d ₁ = {d ₁₁ ... d _1N } value at position n d _1ave : d ₁ = average value K of {d ₁₁ ... d _{1N }:} The constant of proportionality h _1n : the height of the above-mentioned slot after the hypothetical adjustment h ₁ = {h ₁₁ ... h _1N } the value at position n h _1ave : h ₁ = the average of {h ₁₁ ... h _1N} Value h _0n : the height of the above-mentioned slot before adjustment h ₀ = {h ₀₁ ... h _0N } value at position n h _0ave : h ₀ = {h ₀₁ ... h _0N } average value d _0n : The thickness of the above-mentioned spray before adjustment d ₀ = {d ₀₁ ... d _0N } value at position n d _0ave : d ₀ = the average value of {d ₀₁ ... d _0N } v: the above fluid The viscosity index [Numerical formula 2]

e _n : the above difference e = {e ₁ ... e _N } the value at position n d _refn : the target value of the thickness of the above-mentioned ejection d _ref = {d _ref1 ... d _refN } at position n value

With this configuration, if the height h _{0 of the slot before the adjustment, the thickness d 0} of the ejected material before the adjustment, and the value of the proportional constant K calculated from the formula (2) are clarified, it can be calculated based on the formula (1) The difference e between the thickness d ₁ and the target value d _ref of the thickness is calculated to determine the height of the slot, so the thickness of the ejected object can be adjusted relatively easily and accurately.

In the extrusion method of the present invention, it is preferable to obtain _{h 1} ={h _{11 at which} the sum of the squares of the _{difference e={e 1} ... e _{N} represented by the following formula (4) becomes the smallest} ...h _1N }, the height of the above-mentioned slot is determined based on this h _1. [Numerical formula 3]

With this configuration, according to the so represented by the formula (4) the total value of the square of the difference e becomes the minimum is determined by the height h ₁ of the slots, it is possible to more accurately adjust the thickness of the ejecta. [Effects of the invention]

As described above, according to the present invention, it is possible to provide an extrusion method that can relatively easily and accurately adjust the thickness of the ejected product.

Hereinafter, an extrusion method according to an embodiment of the present invention will be explained with reference to the drawings.

The extrusion method of the present embodiment is the following method: the coating device called the coater 1 shown in FIGS. 1 to 3 is used to coat the surface of the object to be coated such as film F as a fluid coating The liquid forms a coating film as the ejected product, and the coating film is formed on the surface of the film F.

The coating machine 1 is provided with a die nozzle 10 for forming a slot 11 for spraying the coating liquid. The die nozzle 10 is configured to apply the coating liquid ejected from the slot 11 to the coated object such as the film F to form a coating film on the surface of the film F. The film F is supported by a roller member etc. and is close to the slot 11 The way of opening 110. The die nozzle 10 is formed so that the ejection portion 13 of the opening 110 formed with the slit 11 protrudes toward the coating object such as the film F. In this embodiment, the die nozzle 10 has a first module 20 (the lower module in the figure) and a second module 30 (the upper module in the figure), and a slot 11 is formed between each module. Hereinafter, the direction in which the film F or the coating film flows is sometimes referred to as MD, and the direction orthogonal to MD is sometimes referred to as TD. In addition, the height of the opening 110 of the slot 11 is referred to as the height h of the slot 11.

The die nozzle 10 of this embodiment further has an adjustment mechanism 50 on the second module 30 side for adjusting the height h of the slot 11. In this embodiment, the adjustment mechanism 50 has: a slit 51 which is arranged on the second module 30 along the width direction of the slit 11; and a plurality of adjusting screws 52 which adjust the interval between the slits 51 to adjust the slit 11 The height h. The plurality of adjusting screws 52 are arranged along the extending direction of the slit 51 (in other words, along the width direction of the slit 11). By rotating each adjusting screw 52 to advance or retreat, the interval between the slits 51 is enlarged or reduced, and the height h of the slit 11 is enlarged or reduced accordingly.

As the adjustment screw 52, for example, a differential screw 52 can be preferably used. Therefore, it is easy to fine-tune the height h of the slot 11. The differential screw 52 has an outer screw 521 formed as a hollow and an inner screw 522 formed to be screwed with the inner side of the outer screw 521. The outer screw 521 and the inner screw 522 are formed to have different pitches. Therefore, when the outer screw 521 is rotated for one revolution, the slit 51 expands or reduces the pitch difference between the outer screw 521 and the inner screw 522.

As shown in FIG. 2, in this embodiment, the die nozzle 10 has a plate-shaped gasket member 40, and the gasket member 40 is arranged to be sandwiched between the first module 20 and the second module 30. The gasket member 40 is formed in a C shape so that the opening faces the opening 110 of the slot 11. By adjusting the width of the opening 42 of the gasket member 40 of the die nozzle 10, the width of the coating film can be adjusted.

The slot 11 is configured such that the height h can usually be adjusted to 0.01 mm to 5 mm. In addition, the width of the slot 11 is usually set to 200 mm to 5000 mm. The number of adjusting screws 52 is usually 3 to 90. In addition, the distance between the center of the rotation axis of each adjustment screw 52 is usually set to 10 mm to 400 mm. The distances between the centers of the rotation axes are preferably equal distances, but they can also be different distances from each other. In this embodiment, the adjustment mechanism 50 has N adjustment screws 52. Hereinafter, the position of the slot 11 corresponding to each adjustment screw 52 of 1 to N and the position of the coating film are referred to as position 1 to position N.

As shown in FIG. 3, the first module 20 has a cavity 22 for temporarily storing the coating liquid supplied through the passage 21 from a storage portion (not shown) that contains the coating liquid. The cavity 22 is formed in a concave shape. In addition, the cavity 22 is connected to the slot 11.

At least the second module 30 of the first module 20 and the second module 30 is made of a material that can be elastically deformed by the pressing force of the adjusting screw 52 or the like. Generally, the first module 20 and the second module 30 are made of metal such as stainless steel. In addition, the gasket member 40 is usually made of metal foil such as stainless steel and brass, or a plastic film such as polyethylene terephthalate.

As a coating liquid, a polymer solution is mentioned, for example. The viscosity of the coating liquid is usually set to 0.0005 Pa·s～200 Pa·s, preferably 0.001 Pa·s～100 Pa·s. In addition, the viscosity was measured with a rheometer (manufactured by HAAKE Corporation). In addition, in the measurement conditions, the shear rate was 1 [1/s] and the temperature was 20°C.

Next, the extrusion method of this embodiment is described in detail.

The extrusion method of this embodiment is a coating method using the coater 1 for forming a coating film on the surface of a coated object such as film F. The coating method includes an adjustment step P and an extrusion step. The adjustment step P is to adjust the height of the slot 11 in order to adjust the thickness d of the coating film formed on the surface of the film F by spraying the coating liquid from the slot 11 h; This extrusion step is followed by the adjustment step P to extrude the coating liquid. In addition, in this embodiment, the flow rate of the coating liquid supplied from the accommodating part of the coating machine 1 is fixed.

In this embodiment, the flow rate of the coating liquid preferably refers to the mass flow rate. In addition, the flow rate of the coating liquid is fixed, which includes the following situations: in stable operation, the value calculated by [maximum flow rate-minimum flow rate]/average flow rate is 0.2 or less, preferably 0.1 or less.

[數式5]

The adjustment step P includes: the data acquisition step P1, which measures the height of the slot 11 at position 1 to position N before adjustment h ₀ = {h ₀₁ ... h _0N }, and the position 1 to position N before adjustment The thickness of the coating film d ₀ ={d ₀₁ ... d _0N }; the constant calculation step P2, which uses the following formula (2) to calculate the change in the height h of the slot 11 and the thickness of the coating film The proportional constant K associated with the change of d; and the height determination step P3, which calculates the thickness d _1n of the coating film at position n from position 1 to position N by the following formula (1), so that _{The calculated thickness d 1} = {d ₁₁ ... d _1N } calculated by formula (3) and the target value of the coating film thickness d _ref = {d _ref1 ... d _refN } difference e = {e ₁ . ..e _N } is reduced to determine the height h of the slot 11. [Equation 4]

[Equation 5]

d _1n represents the calculated thickness of the coated film after adjustment d ₁ = the value at position n of {d ₁₁ ... d _{1N }.} d _1ave represents the average value of _{d 1} = {d ₁₁ ... d _{1N }.} In this embodiment, since the flow rate of the coating liquid is fixed, it can also be regarded as d _1ave =d _0ave . K represents the constant of proportionality. h _1n represents the hypothetical adjusted height of the slot 11 h ₁ = the value at position n of {h ₁₁ ... h _{1N }.} h _1ave represents the average value of _{h 1} = {h ₁₁ ... h _{1N }.} h _0n represents the height of the above-mentioned slot before adjustment h ₀ = the value at position n of {h ₀₁ ... h _{0N }.} h _0ave represents the average value of _{h 0} = {h ₀₁ ... h _{0N }.} d _0n represents the thickness of the above-mentioned ejected material before adjustment d ₀ = the value at position n of {d ₀₁ ... d _{0N }.} d _0ave represents the average value of _{d 0} = {d ₀₁ ... d _{0N }.} v represents the viscosity index of the coating liquid. e _n represents the value at position n where the difference e={e ₁ ... e _{N }.} d _{refn represents the target value d ref} = {d _ref1 ... d _refN } of the target value of the thickness of the above-mentioned ejected material at position n.

The above formula (1) is derived from the following formula (5). In the following formula (5), the left side represents the variation of the thickness d of the coating film, and the parenthesis on the right represents the variation of the height h of the slot 11, and each variation is related by the proportional constant K. [Equation 6]

The above formula (5) is based on the following formula (6) which is established when the coating liquid is assumed to be a Newtonian fluid. [Equation 7]

Q represents the flow rate of Newtonian fluid flowing in the slot 11. W represents the coating width. ΔP represents the pressure difference (p1-p2) between the pressure p1 of the Newtonian fluid at the upstream end 111 of the slot 11 and the pressure p2 of the Newtonian fluid at the opening 110. μ represents viscosity. L represents the length of the slot, that is, the distance from the upstream end 111 to the opening 110.

As mentioned above, the formula (6) indicates that the rate of change of the flow rate of the Newtonian fluid dQ/Q is in a proportional relationship with the rate of change of the height h of the slot 11, dh/h. In addition, the above-mentioned formula (1) is derived by taking the rate of change of the flow rate dQ/Q in the formula (6) as the rate of change of the film thickness d of the coating liquid.

The above-mentioned formula (2) is derived from the following formula (7) obtained by rewriting the above-mentioned formula (6) when it is a non-Newtonian fluid. [Equation 8]

In the above formula (2), v represents the viscosity index of the coating liquid. Generally, the viscosity of a liquid such as a coating liquid is expressed by the following approximate formula (8). In this embodiment, the viscosity index v obtained by the above-mentioned approximate formula based on the viscosity data of the coating liquid measured by the rheometer can be substituted into the formula (2) for use. [Numerical formula 9]

μ represents the viscosity of the coating liquid [Pa·s]. η represents the zero shear viscosity of the coating liquid [Pa·s]. γ represents the shear speed [1/s]. v represents the viscosity index of the coating liquid.

[Data acquisition step P1] In the data acquisition step P1, the thickness d of the coating film at the height h of the slot 11 before adjustment is measured. That is, the height of the slot 11 at position 1 to position N before adjustment h ₀ = {h ₀₁ ... h _0N } and the thickness of the coating film at position 1 to position N before adjustment d ₀ = { d ₀₁ ... d _0N } Perform measurement.

For the measured value of the height h of the slot 11 at position 1 to position N, the measured value of the height of the part corresponding to the adjustment screw 52 can be used. That is, the height h of the slot 11 at the same position as the adjustment screw 52 in the TD is used as the measurement value.

For the measured value of the thickness d of the coating film at position 1 to position N, the thickness d of the coating film at the same position as the adjustment screw 52 on the TD can be used. The thickness d of the coating film is measured by, for example, a linear gauge (manufactured by Ozaki Manufacturing Co., Ltd.).

Data acquisition step P1, then calculate _{h 0 = {h 01 ... h} 0N} _h 0ave and the average value _{d 0 = {d 01 ... d} 0N} The average of d _0ave.

[Constant calculation step P2] In the constant calculation step P2, the above formula (2) is used to calculate the proportionality constant K that relates the change in the height h of the slot 11 and the change in the thickness d of the coating film. The proportional constant K is substituted into the constant used in the formula (1) in the height determination step P3 as follows.

_{[Height determination step P3] In the height determination step P3, the thickness d 1n} at position n from position 1 to position N is calculated using the above formula (1) _{, so that the calculated thickness d 1} = calculated by the above formula (3) {D ₁₁ ... d _1N } and the target value of thickness d _ref = {d _ref1 ... d _refN } difference e={e ₁ ... e _N } to calculate the position 1～position The height of the adjusted slot at N positions h ₁ = {h ₁₁ ... h _1N }.

In this embodiment, h ₁ = {h ₁₁ ... h _{1N } is the square of the difference e = {e 1} ... e _N } expressed by the following formula (4) by the least square method Calculate the way that the total value becomes the smallest. For example, h ₁ = {h ₁₁ ... h _1N } is calculated by assigning an arbitrary initial value and using the solver of EXCEL (registered trademark). And, based on the value of h ₁ = {h ₁₁ ... h _1N }, determine the height of the adjusted slot 11 h ₂ = {h ₂₁ ... h _2N }. As the height of the adjusted slot 11 h ₂ = {h ₂₁ ... h _2N }, the value of _{h 1} = {h ₁₁ ... h _1N } can be used directly _{, or h 1} = {h ₁₁ ...h _1N } is the value obtained by fine-tuning the reference. [Equation 10]

As described above, according to the extrusion method of this embodiment, it is only necessary to clarify the height of the slot 11 before adjustment h ₀ = {h ₀₁ ... h _0N }, and the thickness of the coating solution before adjustment d ₀ = { d ₀₁ ... d _0N } and the value of the proportional constant K calculated from the formula (2) can be based on the calculated thickness calculated from the formula (1) d ₁ = {d ₁₁ ... d _1N } and the thickness target The value d _ref = {d _ref1 ... d _refN } difference e = {e ₁ ... e _N } determines the height of the slot 11 h ₁ = {h ₁₁ ... h _1N }, based on the h ₁ = {H ₁₁ ... h _1N } determines the height of the adjusted slot 11 h ₂ = {h ₂₁ ... h _2N }, so the thickness of the coating liquid can be adjusted relatively easily and accurately. In addition, the extrusion method of the present embodiment is not only excellent in adjusting the thickness d of the coating liquid to the target uniform thickness, but also excellent in adjusting the thickness d of the coating liquid to the target uneven thickness.

In addition, the extrusion method of the present invention is not limited to the above-mentioned embodiment. In addition, the extrusion method of the present invention is not limited by the above-mentioned effects. The extrusion method of the present invention can be variously modified without departing from the gist of the present invention.

For example, in the above-mentioned embodiment, the coating method using the coater 1 was described, but it may also be a resin film molding method using a T-die nozzle for extruding molten resin. In this case, the viscosity of the molten resin is preferably 1000 Pa·s to 5000 Pa·s.

In addition, in the above-mentioned embodiment, the aspect in which the height h of the slot 11 is adjusted by the adjustment mechanism 50 having the slit 51 and the adjustment screw 52 is shown, but it is not limited to this. As the other adjusting mechanism 50, a thermal bolt may be used instead of the adjusting screw 52. In addition to this, for example, the spacer member 40 and each module may be processed to adjust the height h of the slot. In addition, the prototype coater 1 can also be used to implement the data acquisition step P1 and the constant calculation step P2 to manufacture a coater with the height h set in the height determination step P3 in order to obtain the desired thickness d of the coating film 1.

In addition, in the above-mentioned embodiment, the least square method is shown as the approximation method, but in addition to this, for example, the Newton method may be adopted. [Example]

Hereinafter, the present invention will be further explained by showing embodiments.

In this embodiment, the method of forming a coating film using a coater is discussed.

[Coating Device] The coater used in this embodiment is made of stainless steel, and a slot with a width of 1300 mm is formed between the first module and the second module. In addition, as a slot height adjustment mechanism, the coating machine has a slot provided in the second module and 26 (ie, N=26, position 1 to position 26) adjustment screws (rotation axis) arranged on the entire TD The distance between the centers: 50 mm and fixed).

[Coating conditions] Under the coating conditions shown in Table 1, the surface of the film to be coated was coated with an acrylic polymer as a coating liquid and dissolved in a solvent to form a coating film containing the acrylic polymer as a spray .

[Table 1] Coating conditions Coating liquid Acrylic polymer Coating solution concentration 20 vol% Coating fluid viscosity 2.53 Pa•s Viscosity Index of Coating Liquid 0.346 Flow rate of coating liquid 1.755 kg/min Coating width 1300 mm Film speed 20 m/min Coating thickness 75.00 μm Average thickness after drying 15.00 μm

[Example 1] In Example 1, a method of adjusting the height of the slot in such a way that the thickness of the coating film is changed from a non-uniform state to a uniform state is illustrated.

(Data acquisition step P1) For the height of the slot at position 1 to position 26 before adjustment h ₀ = {h ₀₁ ... h _{0_26} } and the thickness d of the coating film at position 1 to position 26 before adjustment ₀ = {d ₀₁ ... d _{0_26} } Perform measurement. The measurement results are shown in Table 2.

(Constant calculation step P2) The viscosity index v of the coating liquid used in this embodiment was calculated using the above formula (8), and the viscosity index v was substituted into the above formula (2) to calculate the proportional constant K. As shown in Table 2, K=4.89.

_{(Height determination step P3) Set the target value d ref} of the thickness of the coating film shown in Table 2 d ref = {d _ref1 ... d _ref26 }, by using the above formulas (1), (3) and (4) Least square method, so that the calculated thickness d ₁ = {d ₁₁ ... d _{1_26} } from position 1 to position 26} and the target value of thickness d _ref = {d _ref1 ... d _ref26 } difference e={e ₁ ...e ₂₆ ｝ squared total value becomes the smallest way to calculate the height of the adjusted slot h ₁ = {h ₁₁ ... h _{1_26} } at position 1 to position 26. The calculation results are shown in Table 2 below.

(Extrusion step) As the height of the slot h ₂ = {h ₂₁ ... h _2N }, use the above calculated h ₁ = {h ₁₁ ... h _{1_26} } to form a coating film on the film. The results obtained by measuring the adjusted thickness are shown in Table 2 and FIG. 4.

As shown in Table 2 and Figure 4, the thickness of the coating film before adjustment is not uniform around the width of 255 mm and the width of 1125 mm. The thickness of the coating film after adjustment is adjusted to be approximately in the entire width direction. Become the uniform state of the goal.

[Table 2] Position of adjusting screw [mm] Proportional constant K h ₀ [μm] h ₁ [μm] d ₀ [μm] d _ref [μm] Adjusted thickness [μm] 25 4.89 300.0 293.8 15.90 15.00 15.03 75 4.89 300.5 295.3 15.60 15.00 15.02 125 4.89 300.0 294.6 15.69 15.00 15.01 175 4.89 299.5 294.2 15.66 15.00 15.00 225 4.89 300.0 295.2 15.52 15.00 14.98 275 4.89 300.0 296.5 15.21 15.00 15.00 325 4.89 300.0 297.1 15.06 15.00 14.98 375 4.89 300.0 299.7 14.42 15.00 15.01 425 4.89 300.0 300.8 14.14 15.00 14.97 475 4.89 299.5 300.8 14.05 15.00 15.02 525 4.89 300.0 301.2 14.01 15.00 14.96 575 4.89 300.5 302.3 13.91 15.00 15.02 625 4.89 300.0 301.9 13.85 15.00 14.99 675 4.89 300.5 302.4 13.86 15.00 15.00 725 4.89 300.0 301.7 13.93 15.00 15.01 775 4.89 299.5 300.8 14.00 15.00 14.99 825 4.89 300.0 301.3 14.06 15.00 15.04 875 4.89 300.0 299.6 14.38 15.00 14.94 925 4.89 299.5 296.9 15.02 15.00 15.02 975 4.89 299.5 294.6 15.54 15.00 15.00 1025 4.89 300.0 294.1 15.80 15.00 15.00 1075 4.89 300.0 292.5 16.20 15.00 15.00 1125 4.89 300.5 292.7 16.27 15.00 15.02 1175 4.89 300.0 292.6 16.18 15.00 15.00 1225 4.89 300.0 294.0 15.81 15.00 15.00 1275 4.89 300.0 293.6 15.91 15.00 14.99

[Comparative Example 1] In Comparative Example 1, the result of adjusting the height of the slot by a skilled operator without using this method is illustrated. In Comparative Example 1, _{the values of h 0} , d ₀ and d _{ref were} set to the same values as in Example 1. In addition, based on _{the measured values of h 0} and d ₀ , the height of the slot is adjusted 5 times with the adjustment screw. The results are shown in Table 3 and Figure 5.

As shown in Table 3 and Fig. 5, the result is a deviation from the target value in the entire width direction. In the entire width direction, the thickness that was originally smaller than the target value became larger than the target value, and the thickness that was originally larger than the target value became smaller than the target value. It can be seen that it is difficult to adjust based on the experience of the operator.

[table 3] Position of adjusting screw [mm] h ₀ [μm] d ₀ [μm] d _ref [μm] Adjusted thickness [μm] 25 300.0 15.90 15.00 14.50 75 300.5 15.60 15.00 14.57 125 300.0 15.69 15.00 14.63 175 299.5 15.66 15.00 14.60 225 300.0 15.52 15.00 14.80 275 300.0 15.21 15.00 15.00 325 300.0 15.06 15.00 15.00 375 300.0 14.42 15.00 15.18 425 300.0 14.14 15.00 15.20 475 299.5 14.05 15.00 15.08 525 300.0 14.01 15.00 14.96 575 300.5 13.91 15.00 15.02 625 300.0 13.85 15.00 14.99 675 300.5 13.86 15.00 15.17 725 300.0 13.93 15.00 15.28 775 299.5 14.00 15.00 15.20 825 300.0 14.06 15.00 15.04 875 300.0 14.38 15.00 14.94 925 299.5 15.02 15.00 15.02 975 299.5 15.54 15.00 15.10 1025 300.0 15.80 15.00 15.32 1075 300.0 16.20 15.00 15.25 1125 300.5 16.27 15.00 15.20 1175 300.0 16.18 15.00 15.15 1225 300.0 15.81 15.00 15.25 1275 300.0 15.91 15.00 15.30

In the following Table 4, the accuracy of the thickness of the coating film before and after adjustment of Example 1 and Comparative Example 1 is summarized. The thickness accuracy is calculated by [Maximum Thickness-Minimum Thickness]/Average Thickness×100. It can be seen from the results of Table 4 that compared with Comparative Example 1, the extrusion method of Example 1 can easily and accurately adjust the thickness of the coating film.

[Table 4] Example 1 Comparative example 1 Adjusting screw adjustment times (times) 1 5 Thickness accuracy before adjustment (%) 16.10 16.10 Thickness accuracy after adjustment (%) 0.63 5.46

[Example 2] In Example 2, a method of adjusting the height of the slot so that the thickness of the coating film is changed from a uniform state to an uneven state is illustrated. In addition, the coating conditions are the conditions shown in Table 5. The results are shown in Table 6 and Fig. 6.

[table 5] Coating conditions Coating liquid Acrylic polymer Coating solution concentration 20 vol% Coating fluid viscosity 2.53 Pa•s Viscosity Index of Coating Liquid 0.429 Flow rate of coating liquid 2.344 kg/min Coating width 1300 mm Film speed 20 m/min Coating thickness 100.17 μm Average thickness after drying 20.03 μm

As shown in Table 6 and FIG. 6, the thickness of the adjusted coating film was adjusted so that it became a target uneven state in the entire width direction.

[Table 6] Position of adjusting screw [mm] Proportional constant K h ₀ [μm] h ₁ [μm] d ₀ [μm] d _ref [μm] Adjusted thickness [μm] 25 4.33 400.0 403.4 19.80 19.86 20.00 75 4.33 400.5 405.0 19.90 20.20 20.35 125 4.33 400.0 405.3 20.00 20.47 20.40 175 4.33 400.0 405.7 20.10 20.67 20.60 225 4.33 400.0 405.9 20.20 20.81 20.90 275 4.33 399.5 404.8 20.40 20.88 20.88 325 4.33 400.0 405.9 20.30 20.90 20.93 375 4.33 400.0 406.2 20.20 20.87 20.80 425 4.33 400.0 406.8 20.00 20.79 20.75 475 4.33 400.0 406.2 20.00 20.67 20.75 525 4.33 400.0 405.1 20.10 20.52 20.50 575 4.33 399.5 404.2 20.00 20.35 20.30 625 4.33 400.0 404.3 19.90 20.15 20.23 675 4.33 400.0 403.8 19.80 19.95 20.02 725 4.33 400.0 402.4 19.90 19.74 19.72 775 4.33 399.5 400.5 20.00 19.54 19.52 825 4.33 399.5 399.7 19.98 19.36 19.43 875 4.33 400.0 399.2 20.03 19.19 19.16 925 4.33 400.0 398.4 20.08 19.07 19.10 975 4.33 400.0 397.9 20.10 18.98 19.00 1025 4.33 400.5 399.0 19.95 18.95 18.99 1075 4.33 400.5 399.4 19.90 18.99 18.95 1125 4.33 400.0 398.9 20.00 19.10 19.02 1175 4.33 400.0 399.7 20.04 19.30 19.40 1225 4.33 400.0 401.3 20.00 19.61 19.63 1275 4.33 400.5 402.8 20.20 20.02 20.05

1: Coating machine 10: Mould mouth 11: Slot 13: Squirting part 20: Module 1 21: Access 22: Cavity 30: Module 2 40: Gasket member 42: opening 50: adjustment mechanism 51: slit 52: adjusting screw 110: opening 111: Upstream side 521: Outer screw 522: Internal Screw

Fig. 1 is a schematic perspective view of a die nozzle used in an extrusion method of an embodiment. Fig. 2 is an exploded perspective view of the mold nozzle of Fig. 1; Fig. 3 is a schematic cross-sectional view of the mold nozzle of Fig. 1 taken along line III-III. FIG. 4 is a graph for comparing the height of the slot before and after adjustment and the thickness change of the coating film in Example 1. FIG. FIG. 5 is a graph for comparing the thickness changes of the coating film before and after adjustment in Comparative Example 1. FIG. FIG. 6 is a graph for comparing the height of the slot before and after the adjustment in Example 2 and the thickness change of the coating film.

1: Coating machine

11: Slot

13: Squirting part

20: Module 1

21: Access

22: Cavity

30: Module 2

40: Gasket member

50: adjustment mechanism

51: slit

52: adjusting screw

110: opening

111: Upstream side

521: Outer screw

522: Internal Screw

Claims (2)

An extrusion method that uses a die nozzle forming a slot for ejecting a fluid. The extrusion method includes adjusting the height of the slot in order to adjust the thickness of the ejected product from the slot. The adjustment step, the adjustment step includes the following steps: using the following formula (1) and formula (2) to calculate the position of any position 1 to position n in the direction orthogonal to the flow direction of the ejected material The thickness d _{1n is} calculated by the following formula (3), and the calculated thickness d ₁ = {d ₁₁ ... d _1N } and the target value of thickness d _ref = {d _ref1 ... d _refN } difference e= {E ₁ ...e _N } is reduced to determine the height of the above slot, [Numerical formula 1]

d _1n : the calculated thickness of the above-mentioned ejected material after adjustment d ₁ = {d ₁₁ ... d _1N } value at position n d _1ave : d ₁ = average value K of {d ₁₁ ... d _{1N }:} The constant of proportionality h _1n : the height of the above-mentioned slot after the hypothetical adjustment h ₁ = {h ₁₁ ... h _1N } the value at position n h _1ave : h ₁ = the average of {h ₁₁ ... h _1N} Value h _0n : The height of the above-mentioned slot before adjustment h ₀ = {h ₀₁ ... h _0N } Value at position n h _0ave : h ₀ = {h ₀₁ ... h _0N } The average value d _0n : The thickness of the above-mentioned spray before adjustment d ₀ = {d ₀₁ ... d _0N } value at position n d _0ave : d ₀ = the average value of {d ₀₁ ... d _0N } v: the above fluid The viscosity index [Numerical formula 2]

e _n : the above difference e = {e ₁ ... e _N } the value at position n d _refn : the target value of the thickness of the above-mentioned ejection d _ref = {d _ref1 ... d _refN } at position n value. Such as the extrusion method of claim 1, in which the sum of the squares of the _{difference e={e 1} ...e _{N } expressed by the following formula (4) is obtained as h 1} = {h ₁₁ .. .h _1N }, based on the h ₁ to determine the height of the above-mentioned slot, [number 3]

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