JP3770485B2 - Method for loosely winding film material wound in a roll - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a film or sheet material wound in a roll shape used in the field of electronic / electric industry, for example, two or more kinds of material layers having different thermal expansion coefficients such as a laminated film of a metal foil and a plastic film. The present invention relates to a method of loosening and winding a roll wound with a laminated film under high tension for the purpose of relaxing residual stress.
[0002]
[Prior art]
For example, when two types of material layers with different thermal expansion coefficients such as a film in which a metal foil is bonded to a plastic film using an adhesive are bonded with an adhesive and the adhesive of a roll wound is cured, When cured, wrinkles are generated during the heat treatment for curing. Therefore, it is necessary to unwind the roll that has been wound once and wind it loosely around the inner surface of the cylinder (hereinafter, this operation is referred to as “relaxed winding”), and after relieving the residual stress, it is necessary to perform a thermosetting treatment.
[0003]
Conventionally, this loose winding operation has been performed manually, but skill is required to perform loose winding without generating wrinkles on the surface of the film, and a long time is required. In particular, when the film is thin and has no waist, there is a limit to the length of film that can be loosely wound without causing wrinkles in manual work, which is also a constraint in terms of productivity. It was. Therefore, it has been strongly desired to eliminate these problems by automating the loosening and winding work.
[0004]
[Problems to be solved by the invention]
Therefore, an object of the present invention is to provide a method suitable for automation, which can surely perform a loose winding operation of a film or sheet-like material wound in a roll shape.
[0005]
[Means for Solving the Problems]
According to the present invention, as means for solving the above problems,
In a method of automatically loosening and winding a roll in which a film material is wound in a roll shape, the center of the roll is eccentric by a suitably determined amount with respect to the center of a cylinder having an inner diameter larger than the outer diameter of the roll. The film material is loosely wound along the inner surface of the cylinder while the roll is rotated in a direction opposite to the direction of the revolution by a rotation angle obtained by revolving in the state and by multiplying the revolution angle by a constant proportional constant. There is provided a method for loosely winding a film material wound in a roll.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in more detail.
[0007]
The method of the present invention preferably comprises a roll of film material wound in the form of a roll:
α = Tu / T
[Where T is the thickness of the film and Tu is the loose winding pitch. ]
A method of loosely winding with a loose winding rate α that is greater than 1 (usually 1.1 to 3) represented by:
Each axis is arranged in parallel in a cylinder having an inner diameter larger than the outer diameter of the roll,
While revolving the roll with respect to the center of the cylinder so that the roll is unwound in the state where the center of the roll is eccentric from the center of the cylinder and simultaneously loosely wound along the inner surface of the cylinder, When the roll rotates in the direction opposite to the direction of the revolution, control is performed so as to satisfy the following conditions (a) to (b).
[0008]
(A) The length of the film to be unwound from the roll matches the length of the film to be wound along the inner surface of the cylinder,
(B) The rotation angle (θs) of the roll is expressed by the following equation (5) with respect to the revolution angle (Θ):
θs = (Θ−do · π / T) + (π / T) · (T · Tu · Θ ² / π ² −2T · Di · Θ / π + do ² ) ^0.5 (5)
[Wherein, do represents the outer diameter of the roll, Di represents the inner diameter of the cylinder, T represents the thickness of the film material, and Tu represents the pitch of loose winding around the inner surface of the cylinder. ]
It is in the relationship represented by.
[0009]
Moreover, it is preferable to perform the method of this invention by controlling so that the following conditions (c) may be satisfy | filled.
[0010]
(C) The eccentric amount (ε) from the cylinder at the center of the roll is the revolution angle (Θ) and the following equation (6):
ε = (Di−do) / 2− (Tu−T) · Θ / 2π−T · θs / 2π (6)
The relationship represented by is satisfied.
[0011]
These embodiments will be further described with reference to FIG.
[0012]
FIG. 1 is a cross-sectional view for explaining a state in which a roll 3 around which a laminated film 2 is wound is disposed in a cylinder 1. The center 4 of the roll 3 is eccentric from the center 5 of the cylinder 1 by a length ε (eccentricity). The roll 3 revolves in the direction of the arrow 6 along the inner surface of the cylinder 1 in the direction in which the wound film 2 is unwound, and simultaneously rotates in the direction of the arrow 7. The direction 6 of revolution and the direction 7 of rotation are opposite directions. At this time, when it is desired to set the loose winding pitch T to a desired value, in other words, when the desired loose winding rate α (Tu / T) is desired to be set to a desired value, the roll 2 satisfies the following conditions (a) and (b): Exercise to be satisfied. Furthermore, exercise is performed so that the condition (c) is satisfied.
[0013]
(A) The length of the film unrolled from the roll matches the length of the film wound along the inner surface of the cylinder.
[0014]
That is, in order not to give harmful tension or slack to the film wound along the inner surface of the cylinder 1, the length of the film wound on the inner surface of the cylinder 1 and the length of the film unrolled from the original roll. Must be equal.
[0015]
(B) The rotation angle (θs) of the roll is expressed by the following equation (5) with respect to the revolution angle (Θ):
θs = (Θ−do · π / T) + (π / T) · (T · Tu · Θ ² / π ² −2T · Di · Θ / π + do ² ) ^0.5 (5)
[Wherein, do represents the outer diameter of the roll, Di represents the inner diameter of the cylinder, T represents the thickness of the film material, and Tu represents the pitch of loose winding around the inner surface of the cylinder. ]
It is in the relationship represented by.
[0016]
This condition (b) defines the relative relationship between the rotation angle and the revolution angle. After all, this constraint condition (b) means that the rotation angle of the original roll is in a certain proportional relationship with the revolution angle, and the proportionality constants are the inner diameter of the cylinder, the outer diameter of the original roll, and the film thickness. Is known under specific conditions, and is given depending on the winding pitch Tu (in other words, the loose winding rate α) on the inner surface of the cylinder.
[0017]
(C) The eccentric amount (ε) from the cylinder at the center of the roll is the revolution angle (Θ) and the following equation (6):
ε = (Di−do) / 2− (Tu−T) · Θ / 2π−T · θs / 2π (6)
The relationship represented by is satisfied.
[0018]
In short, the condition (c) defines the trajectory of movement of the original roll center with respect to the cylinder, and the control condition (c) is such that the eccentric amount of the roll center with respect to the cylinder is also constant with respect to the revolution angle. Since the initial value and proportional constant are known under specific conditions, the inner diameter of the cylinder, the outer diameter of the original roll, and the film thickness, the winding pitch Tu on the inner surface of the cylinder (in other words, If the desired value of the loose winding rate α) is obtained, it is given. That is, the locus of the center of the original roll starts from the initial eccentricity and moves according to the equation (6). Actually, it follows a spiral trajectory that goes to the inside of the cylinder as the revolution proceeds.
[0019]
The above formulas (5) and (6) are obtained as follows. Symbols other than those described above in the following description are as follows.
[0020]
Revolution angle: Θ
Loose winding length: Lu
Roll unrolling length: Lr
In the rotation angle θs, the origin is the 0 o'clock direction in the spatial coordinate system, and the clockwise direction is positive.
[0021]
Since the wound film can be regarded as a spiral, the following relational expression is obtained from the geometrical expression regarding the spiral.
(Relational expression)
Lu = (Di / 2) × Θ− (Tu / (4π)) × Θ ² (1)
Lr = (do / 2) × (Θ−θs) − (T / (4π)) × (Θ−θs) ² (2)
In addition, the following constraint condition must be satisfied for the act of loosely winding without generating wrinkles. This is an algebraic expression of the condition (a).
(Constrained conditional expression)
Lu = Lr (3)
Substituting Equations (1) and (2) into Equation (3) gives the following equation.
[0022]
(Di / 2) × Θ− (Tu / (4π)) × Θ ² = (do / 2) × (Θ−θs) − (T / (4π)) × (Θ−θs) ² (4)
When equation (4) is solved with respect to θs, the following equation is obtained.
θs = (Θ−do · π / T) + (π / T) · (T · Tu · Θ ² / π ² −2T · Di · Θ / π + do ² ) ^0.5 (5)
In equation (5), for example, do = 170 mm, T = 0.044 mm, Tu = 0.099 mm, Di = 240 mm
FIG. 2 shows the result calculated by substituting. As can be seen from the figure, the relationship between θs and Θ that satisfies equation (5) is proportional. The proportionality constant in that case is determined by the values of do, T, Tu, and Di.
[0023]
Further, in order to prevent the film from being slack, the revolution radius of the roll must be determined so that the distance between the surface of the roll to be unrolled and the inner surface of the cylinder is always kept at an appropriate value. When this condition is expressed by an algebraic expression based on a geometric relationship, the following expression (6) for calculating ε is obtained. (6) gives ε as a function of the revolution angle Θ.
[0024]
ε = (Di-do) / 2- (Tu-T) · Θ / 2π-T · θs / 2π (6)
For example, in the equation (6), do = 170 mm, T = 0.044 mm, Tu = 0.099 mm, Di = 240 mm
FIG. 3 shows the result calculated by substituting. As can be seen from the figure, the relationship between ε and Θ that satisfies Equation (6) is a linear relationship. The initial value and the gradient in that case are determined by the values of do, T, Tu, and Di. As shown in FIG. 3, since the revolution radius ε decreases as compared with the revolution angle, the locus of the roll center is a spiral. However, since the decreasing gradient is very slight, as a practical matter, the revolution radius ε does not change much from the initial value.
[0025]
【Example】
[Example 1]
Figure 2 shows the revolution angle and rotation angle when the inner diameter of the cylinder is 240 mm, the winding pitch of the film wound along the inner surface of the cylinder is 90 μm, the outer diameter of the original roll is 170 mm, and the film thickness is 44 μm. It is a graph which shows a relationship. As shown in the figure, the revolution angle and the rotation angle are in a proportional relationship, and the proportional constant of the rotation angle with respect to the revolution angle is about −0.41. The negative sign indicates that the direction of rotation is the reverse of the direction of revolution.
[0026]
FIG. 3 is a graph showing the relationship between the revolution angle and the amount of eccentricity under the same conditions as in FIG. As shown in the figure, the revolution angle and the eccentricity have a linear relationship, the initial value is about 35 mm, and the gradient is about -0.006 (mm / radian).
[0027]
Next, FIG. 4 shows an example of a driving method when a multi-axis automatic machine having a necessary degree of freedom is driven in order to apply the present invention to loosely roll a roll. In the figure, block C1 represents a unit for calculating Θ, θs, and ε by inputting Di, do, T, and Tu. Θ represents a revolution angle, K1 is a proportional coefficient between the revolution angle and the rotation angle θs, and Eo and K2 are an initial value and a proportional coefficient that determine the revolution radius. Block C2 shows the control unit of the multi-axis automatic machine that gives a predetermined motion to the roll. The function of C2 performs conversion necessary for driving the degrees of freedom axis constituting the apparatus based on the inputted values of Θ, θs, and ε, and drives the roll revolution drive mechanism M1 and the roll rotation drive mechanism M2. Is to generate a control signal.
[0028]
Normally, as shown in FIG. 3, the gradient at which the amount of eccentricity decreases with respect to the revolution angle is very small. Therefore, the revolution center of the roll center is not a spiral but a circle with a radius that is appropriately smaller than the initial value. There is no practical problem even if it is controlled. In addition, if the film is thick and has a waist, loose winding may be possible even if the radius of the revolution locus circle is further reduced. In extreme cases, loose winding may be possible even if the revolution radius is close to zero. May be possible. Since these cases can also be considered as special examples of the present invention, they are basically included in the scope of the present invention.
[0029]
【The invention's effect】
According to the method of the present invention, it is possible to reliably perform the loose winding operation of the roll-shaped film material, which has been performed manually by relying on the operator's intuition and skill, and the roll outer diameter capable of loose winding can be increased. It can be significantly increased compared to the case of work. Automation by a machine is easy, labor saving is achieved, and manufacturing costs can be reduced.
As a result, the following effects can be expected.
[Brief description of the drawings]
FIG. 1 is a schematic diagram illustrating the method of the present invention.
FIG. 2 is a graph showing the relationship between the revolution angle and the rotation angle obtained in the example.
FIG. 3 is a graph showing the relationship between the revolution angle and the amount of eccentricity obtained in an example.
FIG. 4 is a block diagram illustrating a method for controlling and operating a multi-axis automatic machine according to the method of the present invention.

Claims (3)

In a method of automatically loosening and winding a roll in which a film material is wound in a roll shape, the center of the roll is eccentric by a suitably determined amount with respect to the center of a cylinder having an inner diameter larger than the outer diameter of the roll. The film material is loosely wound along the inner surface of the cylinder while the roll is rotated in a direction opposite to the direction of the revolution by a rotation angle obtained by revolving in the state and by multiplying the revolution angle by a constant proportional constant. A method of loosely winding a film material wound in a roll. A roll of film material rolled into a roll
α = Tu / T
[Where T is the thickness of the film and Tu is the loose winding pitch. ]
A method of loosely winding with a loose winding rate α greater than 1 represented by:
Each axis is arranged in parallel in a cylinder having an inner diameter larger than the outer diameter of the roll,
While revolving the roll with respect to the center of the cylinder so that the roll is unwound in the state where the center of the roll is eccentric from the center of the cylinder and simultaneously loosely wound along the inner surface of the cylinder, 2. The loose winding method according to claim 1, wherein when the roll rotates in a direction opposite to the direction of the revolution, the roll is controlled so as to satisfy the following conditions (a) and (b): 3.
(A) The length of the film to be unwound from the roll matches the length of the film to be wound along the inner surface of the cylinder,
(B) The rotation angle (θs) of the roll is expressed by the following equation (5) with respect to the revolution angle (Θ):
θs = (Θ−do · π / T) + (π / T) · (T · Tu · Θ ² / π ² −2T · Di · Θ / π + do ² ) ^0.5 (5)
[Wherein, do represents the outer diameter of the roll, Di represents the inner diameter of the cylinder, T represents the thickness of the film material, and Tu represents the pitch of loose winding around the inner surface of the cylinder. ]
It is in the relationship represented by. Furthermore, the loose winding method of Claim 1 or 2 characterized by performing loose winding so that the following conditions (c) may be satisfy | filled.
(C) The eccentric amount (ε) from the cylinder at the center of the roll is the revolution angle (Θ) and the following equation (6):
ε = (Di−do) / 2− (Tu−T) · Θ / 2π−T · θs / 2π (6)
The relationship represented by is satisfied.

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