JPH0692114B2 - Vinyl sheet curl correction method and correction device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION "Industrial Application Field" The present invention relates to a method for correcting a curl and a curl correction device for a vinyl sheet of a vinyl sheet (including a vinyl film and other synthetic resin sheets, the same applies hereinafter). It is about.

"Prior art and its problem" Conventionally, as a method of removing the curl of a vinyl sheet material unwound from a vinyl sheet roll of this type, the following method is generally adopted.

That is, the vinyl sheet original fabric is inserted between the heating plate and the pressing plate, and the vinyl sheet original fabric is sandwiched between the two.

Then, a method of carrying out the sandwiching for a relatively long time is generally adopted on the basis of the purpose of quickly and simply correcting the curling habit in one step. Certainly, although the above method has some effects, since it is a sandwiching for a long time, extension wrinkles remain as it is, a so-called situation in which a raw vinyl sheet is wavy (ripple), That no corrective correction is achieved,
Further, problems such as distortion of the vinyl package die-cutting product or vinyl package product, which is a major factor of quality deterioration, may be considered. Furthermore, there are many possible problems with conventional correction devices of this type, which often have a large structure and require additional equipment.

"Means for solving the problem" Therefore, the present invention, intermittently sandwiching the time between the correction plate and the pressing plate, the softening correction of the original vinyl sheet,
Also, to effectively utilize self-recovery at room temperature to achieve proper straightening, and to improve the quality of vinyl package (including synthetic resin packages, the same applies below) die-cutting products or vinyl package products. In order to achieve ,, etc., the following configuration was adopted.

That is, the vinyl sheet curl correction method of the present invention is a curl correction method for a vinyl sheet fed from a vinyl roll in the process of manufacturing a die-cut product for a vinyl package for packaging. In the method, the unrolled vinyl sheet raw material is placed between a straightening plate capable of supplying a heat medium and a vertically movable holding plate, and then the vinyl sheet raw material is heated to the temperature. A nipping step of nipping between the straightening plate and the raised holding plate, and a softening straightening step of softening and straightening the vinyl sheet raw material through the feeding of the heat medium to the straightening board after the nipping step, After this softening straightening step is completed, the pressing plate is lowered to open the softened and straightened vinyl sheet raw material, and a self-healing step for self-healing at room temperature, the softening straightening step and the self-healing step. The curl correction process for correcting the curl of the vinyl sheet stock by repeating at least two times, and the flat vinyl sheet master corrected by the curl correction process are used in the next vinyl package die cutting process. And a transfer step of transferring.

Further, the present invention aims to correct the softening of the vinyl sheet original fabric and self-recover at room temperature through the time adjustment by the timer control sandwiched between the straightening plate and the pressing plate, and at the same time, The following configuration was adopted in order to provide a straightening device that can be efficiently controlled in each section during the transportation process.

That is, the vinyl sheet curl correction device of the present invention is provided with a vinyl sheet roll mounted on one side of a frame and a vinyl sheet roll suspended from the upper surface of the frame sandwiching one side of the vinyl sheet roll fed from the vinyl sheet roll. A straightening plate to which the heat medium is supplied, a holding plate that faces the straightening plate and is movable up and down with respect to the standing direction of the frame, and sandwiches the other side of the original vinyl sheet, and the holding plate. And a plurality of guide rolls provided on the other side of the frame for guiding the straightened vinyl sheet stock, and provided between the frames, and the straightened vinyl sheet stock Feeding device, a vinyl package die-cutting device that is continuously provided in the lateral direction of the frame, and a conveying device that conveys vinyl package die-cutting products. When a the provided comprising configuration.

"Operation" Next, the operation of the present invention will be described.

The original vinyl sheet unwound from the vinyl sheet roll is provided with a straightening plate (hereinafter simply referred to as a straightening plate) to which a heat medium is supplied via a guide roll wound with cloth.
It is guided between a cloth-covered presser plate (hereinafter simply referred to as a presser plate).

In this way, the vinyl sheet material introduced between the straightening plate and the holding plate is continuously lifted by the holding plate.
It is moved in the direction of the straightening plate in a substantially horizontal state and is sandwiched between the straightening plate and the pressing plate. Therefore, the first softening correction is started via this sandwiching state, and for example, sandwiching is performed for about 0.6 seconds and starts from the low temperature range.

Through such operations, softening of the vinyl sheet stock,
In other words, it achieves smooth softening of the original vinyl sheet, avoids abrupt changes, and reduces the generation of ripples.

When the first softening correction is completed as described above, the pressing plate is lowered, for example, via the time switch to release the clamp.

This opening and, desirably, by stopping the supply of the heat medium to the straightening plate, at the room temperature, the ripples generated on the original vinyl sheet are self-recovered to correct the distortion caused by the above-mentioned straightening softening. To do. This opening is considered to be ideal for about 0.4 seconds, for example.

The above-described steps of softening correction and self-healing at room temperature are repeated at least twice or more, preferably about 5 times. However, at this time, it is preferable to sequentially increase the temperature control of the straightening plate.

The work according to the operations and procedures described in detail, that is, the vinyl sheet stock produced after the completion of the softening correction and the self-recovery at room temperature has no curling habit and no ripple remains.

In this way, the generated vinyl sheet raw material is then conveyed to each processing machine via a guide roll,
In this example, it is guided to a die cutting device via a feeding device, where it is die-cut into a predetermined shape. The die-cut product of the vinyl package die-cut by this die-cutting process,
After that, it is guided to the storage case via the transporting conveyor.

Moreover, the vinyl sheet residue of the scraps of the die-cut product is sequentially wound around the winding roll for the residue.

[Example] Hereinafter, an example of the straightening method of the present invention and a straightening device used for this method will be described.

First, for convenience of explanation, the orthodontic device will be described. 1 is a frame, and the upper surface of the frame 1 is
One side of the vinyl sheet stock (described later) (in this example,
2 and 3, it is the upper side, that is, the upper surface of the original vinyl sheet. The same applies hereinafter),
Further, the straightening plate 2 for softening the original vinyl sheet is provided, and in this example, the hot air supplied from the pipe 2a communicating with the straightening plate 2 causes the chambers and the pores provided in the straightening plate 2 to flow. It is jetted toward one surface of the original vinyl sheet via (not shown). As a heating medium supply means, means such as supply of hot water or hot air or contact with an oil heater can be considered. The cushioning material may be provided on the correction plate 2. Further, below the straightening plate 2, a vertical movement (upward and downward movement in the standing direction of the frame 1, that is, in FIGS. 2 and 3) is performed by a lifting means 3 such as a cylinder facing the straightening plate 2. A pressing plate 4 is provided which is covered with a cushioning material such as cloth which moves in the vertical direction in the drawing. Therefore, the original vinyl sheet 51 that is unwound from the vinyl sheet roll 5 is
And the pressing plate 4 which comes in contact with and separates from the correction plate 2.

Reference numeral 7 in the drawing denotes a guide post for guiding the pressing plate 4, and in this example, two guide posts are provided on both sides.

Reference numeral 8 in the drawing denotes a guide roll wound with a cushioning material for guiding the original vinyl sheet 51, and the guide roll 8 is provided on one side of the frame 1 (right side in FIG. 2). Further, the guide roll 9 is a guide roll for the vinyl sheet original 51 guide, and the guide roll 9 is the frame 1
It is provided on one side and below the guide roll 8.

Reference numeral 10 in the drawing denotes a guide roll wound with a cushioning material for guiding the original vinyl sheet 51, and the guide roll 10 is provided on the other side of the frame 1 (on the left side in FIG. 2).

Reference numeral 11 in the figure denotes a guide roll provided with the second frame 1b provided on the other front side of the frame 1 and wound with the cushioning material. Reference numeral 12 is a take-up roll provided on the second frame 1b for winding up a remaining unmolded vinyl sheet residual material 51a (a vinyl sheet residue of scraps of a die-cut product) described later. Of course, the disposition of the guide rolls 8 to 11 or the winding roll 12 is an example, and the present invention is not limited to this example.

Then, the straightened vinyl sheet material 51a, which is introduced between the straightening plate 2 and the holding plate 4 and has the curl rectified through the softening correction and the self-recovery at room temperature, is processed. A processing device for performing the processing is provided on the frame 1. In this example, in order to apply the processing to the straightened vinyl sheet raw material 51a conveyed between the guide roll 9 and the guide roll 10, first, at about the center of the frame 1 and its middle stage. (The vertical direction of the frame 1 in FIG. 2 is referred to. The same applies to the following.) It is conveyed via a feeding device 14 and is conveyed to a die cutting device described later. The straightened vinyl sheet raw material 51a is conveyed through the pawls (not shown) provided at both ends of the feeding device 14 described above. The vinyl sheet stock thus conveyed is then on the substantially left side of the frame 1 (the left side in FIG. 2; hereinafter the same), and in the middle thereof, a vinyl package cut product. Mold cutting device 1 for cutting (cutting) 511
Five are provided. Further, in this example, the feeding device 14 and the die cutting device 15 are respectively provided on the interposing member 1a which is arranged in the middle stage of the frame 1. Although not shown in the figure, a device such as a punching device, a trimming device or a sorting device required for die cutting or other processing,
Optional equipment.

In the figure, reference numeral 16 denotes a conveyor for conveying a vinyl package die-cutting product 511, which is provided directly below the die-cutting device 15. Further, 17 is a housing case for housing the die-cut product 511 in the vinyl package.

Next, the production method of the present invention will be described in detail. The vinyl sheet material 51 fed from the vinyl sheet roll 5 is supplied with the heating medium via the guide roll 8 wound with the cloth on one side. Between the straightening plate 2 and the upholstery plate 4,
And the first of the vinyl sheet material 51 introduced at the entrance side
The portion (hereinafter, referred to as the first portion a) is moved in the direction of the correction plate 2 in a substantially horizontal state by the subsequently rising presser plate 4, and is sandwiched between the correction plate 2 and the presser plate 4. To be done.
Therefore, the first softening correction is started through this sandwiching state, and for example, sandwiching is performed for about 0.6 seconds and starts from a low temperature (states of FIG. 4B, FIG. 5C and D). As a result, softening of the original vinyl sheet a, in other words, smooth softening of the first portion a, is achieved, rapid changes are avoided, and ripples are minimized.

When the first softening correction is completed as described above, for example, the pressing plate 4 is lowered via the time switch, the first softening correction is released together with the pressing plate 4, and The nipping is released and the supply of the heat medium to the correction plate 2 is stopped (the state shown in FIGS. 4C, 5E and 5F).
At this opening and at room temperature, the ripples generated in the first portion a are self-recovered, and the distortion generated by the above-mentioned correction softening is corrected. This opening is considered to be ideal for about 0.4 seconds, for example.

Subsequently, the second softening correction and self-recovery at room temperature are aimed at. Specifically, the first part a is located between the correction plate 2 and the pressing plate 4 and on the inlet side. To the second area, between the correction plate 2 and the pressing plate 4 and on the entrance side,
The second portion b of the original vinyl sheet 51 (hereinafter referred to as the second portion b) is introduced (state of FIG. 4D).

Then, the first portion a that has moved to the second region is moved in the direction of the correction plate 2 in a substantially horizontal state by the pressing plate 4 that is subsequently raised, and is sandwiched between the correction plate 2 and the pressing plate 4. To be done. Therefore, the second softening correction is started via this sandwiching state, for example, sandwiching for about 0.6 seconds and starting from a temperature slightly higher than the low temperature range (Fig. 4, E,
(Fig. 5 G and C). As a result, a second softening of the first portion a, in other words, a smooth softening of the first portion a is achieved, abrupt changes are avoided, and the generation of ripples is minimized.

When the second softening correction is completed as described above, for example, the pressing plate 4 is lowered via the time switch, and the second softening correction is released together with the pressing plate 4, and The holding is released and the supply of the heat medium to the correction plate 2 is stopped (Fig. 4, F, Fig. 5, re-state).
At this opening and at room temperature, the ripples generated in the first portion a are self-recovered, and the distortion generated by the above-mentioned correction softening is corrected. This opening is considered to be ideal for about 0.4 seconds, for example. In the process of the second softening correction of the first part a and the self-healing at room temperature, which are described in detail above, the second region between the correction plate 2 and the pressing plate 4 and on the entrance side In the second portion b introduced into the above, the first softening correction of the first portion a and the self-healing process at room temperature have been completed.

Subsequent to the above, the third softening correction and self-recovery at room temperature are aimed at. Specifically, the first portion a is the next third portion between the correction plate 2 and the pressing plate 4. Moving to the region, a third portion c (hereinafter, referred to as a third portion b) of the vinyl sheet material 51 is introduced between the straightening plate 2 and the pressing plate 4 and on the entrance side. (State of FIG. 4). Then, the first portion a that has moved to the third region is moved in the direction of the correction plate 2 in a substantially horizontal state by the pressing plate 4 that subsequently rises, and is sandwiched between the correction plate 2 and the pressing plate 4. To be done. Therefore, the third softening correction is started through this sandwiching state, for example, sandwiching for about 0.6 seconds and starting from a temperature slightly higher than the second temperature (virtual in FIG. 4, fifth).
State of the figure). As a result, smooth softening of the first portion a is achieved, abrupt changes are avoided, and the generation of ripples is minimized.

When the third softening correction is completed as described above, for example, the pressing plate 4 is lowered via the time switch, and the third softening correction is removed together with the pressing plate 4, and The nipping is released and the supply of the heat medium to the correction plate 2 is stopped (phantom points in FIG. 4, cracks in FIG. 5, state of power). At this opening and at room temperature, the ripples generated in the first portion a are self-recovered, and the distortion generated by the above-mentioned correction softening is corrected. This opening is considered to be ideal for about 0.4 seconds, for example.

In the process of the third softening correction of the first part a and the self-healing at room temperature, which are described in detail above, the first part a introduced into the second region between the correction plate 2 and the pressing plate 4 is introduced. The part b of 2 is
The above-described second softening correction of the first portion a and the self-healing process at room temperature are completed. Similarly, between the straightening plate 2 and the pressing plate 4, and the third side introduced on the entrance side.
The part c has undergone the first softening correction of the first part a and the self-healing process at room temperature.

Then, the process proceeds further, and the fourth softening correction and self-recovery at room temperature are aimed at. Specifically, the first part a is the next fourth part between the straightening plate 2 and the pressing plate 4. In the fourth region on the entrance side between the straightening plate 2 and the pressing plate 4 and in the fourth region on the entrance side, the fourth portion d of the vinyl sheet raw material 51 (hereinafter, referred to as the fourth region).
Is the part d. ) Is introduced (state of virtual point in FIG. 5).

Then, the first portion a that has moved to the fourth region is moved in the direction of the correction plate 2 in a substantially horizontal state by the pressing plate 4 that subsequently rises, and is sandwiched between the correction plate 2 and the pressing plate 4. To be done. Therefore, the fourth softening correction is started via this sandwiching state, for example, sandwiching for about 0.6 seconds and starting from a temperature slightly higher than the third temperature (phantom points in FIG. 4, FIG. 5). , State of ta). As a result, a fourth softening of the first portion a, in other words, a smooth softening of the first portion a is achieved, a rapid change is avoided, and the generation of ripples is minimized.

When the fourth softening correction is completed as described above, for example, the pressing plate 4 is lowered via the time switch, and together with this pressing plate 4, the fourth softening correction is released, Release the clamp (Fig. 4, virtual point, Fig. 5,
Seo state). At this opening and at room temperature, the ripples generated in the first portion a are self-recovered, and the distortion generated by the above-mentioned correction softening is corrected. This opening is, for example, 0.4
Seconds are considered ideal.

In the process of the fourth softening correction of the first portion a and the self-healing at room temperature, which are described in detail above, in the process between the correction plate 2 and the pressing plate 4 and the second region on the entrance side. In the second portion b introduced in the above, the third softening correction of the first portion a and the self-healing process at room temperature are completed. Further, the third portion c introduced between the straightening plate 2 and the pressing plate 4 and in the third region on the entrance side is the second softening straightening of the above-mentioned first portion a and at room temperature. The process of self-recovery has been completed. Similarly, the fourth part d introduced between the correction plate 2 and the pressing plate 4 and in the third region on the entrance side is the first softening correction of the first part a, and The process of self-recovery at room temperature is complete.

Next, the fifth softening correction and self-recovery at room temperature are attempted. Specifically, the first portion a moves to the next fifth region between the correction plate 2 and the pressing plate 4. A fifth portion e (hereinafter, referred to as a fifth portion e) of the vinyl sheet material 51 is introduced between the entrance-side correction plate 2 and the pressing plate 4 (see FIG. 4C). Status).

Then, the first portion a that has moved to the fifth region is moved in the direction of the correction plate 2 in a substantially horizontal state by the pressing plate that subsequently rises, and is sandwiched between the correction plate 2 and the pressing plate 4. It Therefore, through this sandwiched state, the fourth softening correction is started, for example, sandwiching for about 0.6 seconds and starting from a temperature slightly higher than the fourth temperature,
The supply of the heat medium to the straightening plate 2 is stopped (Fig. 4 and 5,
Fig. This achieves the fifth softening of the first portion a, in other words, the smooth softening of the first portion a, avoids a sudden change, and minimizes the generation of ripples.

When the fifth softening correction is completed as described above, for example, the pressing plate 4 is lowered via the time switch, and together with this pressing plate 4, the fifth softening correction is canceled, The clamp is released (Fig. 4, nu, Fig. 5, na, la state). At this opening and at room temperature, the ripples generated in the first portion a are self-recovered, and the distortion generated by the above-mentioned correction softening is corrected. This opening is considered to be ideal for about 0.4 seconds, for example. The fifth process of softening and self-healing at room temperature is finished, and the curl of the first portion a of the vinyl sheet material 51 is finished.

In the process of the fifth softening straightening of the first portion a and the self-healing at room temperature, which are described in detail above, the fourth region between the straightening plate 2 and the holding plate 4 and on the entrance side is provided. In the second portion b introduced in the above, the fourth softening correction of the first portion a and the self-healing process at room temperature have been completed. Further, the third portion c introduced between the correction plate 2 and the pressing plate 4 and in the third region on the entrance side is the above-mentioned first portion a.
The third softening correction and self-healing process at room temperature have been completed. Further, the fifth portion d introduced between the straightening plate 2 and the pressing plate 4 and in the fifth region on the entrance side is the second softening straightening of the above-mentioned first portion a and at room temperature. The process of self-recovery has been completed. Similarly, the straightening plate 2
Between the press plate 4 and the holding plate 4, and the N-th part n introduced into the N-th region on the entrance side, the first softening correction of the above-mentioned first part a, and the self-recovering process at room temperature are performed. It's finished.

As described above in detail, in this example, between the straightening plate 2 and the pressing plate 4, from the first portion a to the Nth portion n, the softening correction is performed 5 times and the self-recovery is performed at room temperature. In the process of, the curl of the vinyl sheet material 51 is corrected in sequence, and no ripples are generated. Ultimately, from the exit side of the correction plate 2 and the pressing plate 4, that is, from the fifth area. , Respectively. The supply and stop of the heat medium to the straightening plate 2 is an example.

Further, in the example shown in FIG. 6, the first portion a is introduced between the correction plate 2 and the pressing plate 4 (see FIG. 6A), and at this position (that is, the first portion a). (While stopped), as in the state of Fig. 2B, as described above, clamp for about 0.6 seconds to perform softening correction. At the same position, as in the state of C in the figure, as described above, self-recovery is attempted at room temperature through opening for about 0.4 seconds. In the same position detailed above, ultimately,
After that, as in the state of FIG. 2D, the fifth softening correction and self-recovery at normal temperature are attempted, and the curl of the first part a is sequentially corrected, and ripples do not occur, Ultimately, after the state shown in FIG.
Sent from the exit side of. In other words, at the same position,
This is a method in which the above-mentioned clamping and opening are repeated.

When the correction of the first portion a is completed as described above, the other portion b is then corrected by the correction plate 2 as shown in the state of FIG.
It is introduced between the plate 4 and the holding plate 4. After that, it becomes the same state as the above, the state of J, and after that, like the above,
As shown in the same figure, 5 times of softening correction and self-recovery at normal temperature are aimed at, the curl of each of these parts is corrected in sequence, and no ripples occur. The state shown in the figure is sent out from the outlet side of the holding plate 4 (the other side of the frame 1).

When the correction of each of the first parts is completed, the Nth part n is introduced between the correction plate 2 and the holding plate 4 as shown in the state of FIG. Like the mosquito, the softening correction of 5 times and the self-recovery at room temperature are achieved, and the curl of the Nth part n is sequentially corrected and no ripples are generated. As shown in FIG.

In the method described in detail above, the method of correcting the softening five times and self-recovering at room temperature to correct the curl is explained, but the method is not limited to this example and may be at least twice. For example, the curl was corrected and there was almost no ripple.

"Effects of the Invention" Since the present invention employs the configuration described in detail above, it has the following effects, which will be described in detail below based on the relationship with the above configuration.

That is, in the present invention, in the process of manufacturing a die-cut product of a vinyl package for packaging, after the original vinyl sheet is unrolled, the heating medium straightening plate and the holding plate (ascending) in proximity to this straightening plate are provided. In between, and guiding the unrolled vinyl sheet raw material, softening correction for softening the vinyl sheet raw material is performed through the straightening plate and the pressing plate, and after this softening straightening is performed, the presser foot is pressed. The plate is lowered and the softened and straightened vinyl sheet stock is released to allow self-recovery at room temperature. The softening correction and the self-healing at room temperature are repeated at least twice to correct the curl of the original vinyl sheet. In the vinyl sheet curl correction method, the flat vinyl sheet stock thus corrected is conveyed to the next die cutting process of the vinyl package.

Therefore, the time to clamp between the straightening plate and the holding plate is
It is possible to achieve proper straightening by making effective use of intermittent softening, softening straightening of vinyl sheet fabric, and self-healing at room temperature, and there is no ripple, so that vinyl package cut products It has the effect that quality can be improved.

The present invention also provides a heat medium straightening plate provided on a frame on one side that sandwiches a vinyl sheet roll mounted on a frame and a vinyl sheet roll rewound from the vinyl sheet roll, and the straightening plate. And a holding plate on the other side that sandwiches the original vinyl sheet provided on the frame so as to be able to move up and down, and lifting means that controls the lifting of the holding plate,
A large number of guide rolls provided on the frame and for guiding the straightened original vinyl sheet fabric, a die cutting device provided on the frame for die cutting the straightened vinyl sheet original fabric, and this die cutting A vinyl sheet curl correction device provided with a transfer device for transferring products.

As a result, it is possible to correct the curl of the vinyl sheet raw material by adjusting the time by the timer control sandwiching between the straightening plate and the pressing plate, softening the vinyl sheet raw material, and self-healing at room temperature. The curl correction device is a very efficient and useful curl correction device that can correct curl in the course of transporting the original vinyl sheet and through the operation of each section of the correction plate and the pressing plate.

[Brief description of drawings]

The drawings show one embodiment of the method of the present invention. Fig. 1 is a perspective view of an original vinyl sheet, Fig. 2 is a schematic perspective view of a straightening device, and Fig. 3 is an introducing direction of Fig. 2. An enlarged front view of FIG. 4, FIGS. 4A to 4D are schematic diagrams showing an example of a correction method, and FIGS. 5A to 5D are schematic diagrams showing an example of a correction state, in which A, C, H, T, and R , Le, Wa, Yo, Re, Tsu, Na are schematic side views of the original vinyl sheet, and R, Ni, He, Chi,
Nu, wo, mosquito, ta, se, ne, and la are schematic plan views of the original vinyl sheet, and FIGS. 6A to 6C are schematic diagrams showing another example of the straightening method. 1-frame 1a-passing member 1b-second frame 2-straightening plate 3a-pipe 3-elevating means 4-pressing plate 5-vinyl sheet scroll 7-guide post 8 to 11- Guide roll 12 ...... Winding guide roll 14 …… Feeding device 15 …… Die cutting device 51 a …… Remaining original sheet of vinyl sheet 511 …… Die cutting product a to n …… 1st part to Nth part

Claims (3)

[Claims] 1. A curl correction method for a vinyl sheet unwound from a vinyl roll in the process of manufacturing a die-cut product for a vinyl package for packaging, which curl correction method comprises: After the sheet material is positioned between the straightening plate capable of supplying the heat medium and the vertically movable holding plate, the vinyl sheet raw material is provided with the heated straightening plate and the raised holding plate. A nipping step of nipping between the two, and after the nipping step, a softening and straightening step of softening and straightening the vinyl sheet raw material through the supply of a heat medium to the straightening plate, and after completion of the softening and straightening step, The pressing plate is lowered to open the softened and straightened vinyl sheet raw material, and the self-healing step for self-healing at room temperature and the softening and straightening step and the self-healing step are repeated at least twice or more, B Curl correction process for correcting the curl of the original sheet, and a conveying process for conveying the flat vinyl sheet master corrected in this curl correction process to the next vinyl package die cutting process. Vinyl sheet curl correction method. 2. The vinyl sheet curl correction method according to claim 1, wherein the softening correction and self-recovery at room temperature are performed while sequentially advancing in the process of conveying the original vinyl sheet. . 3. A straightening sheet to be supplied with a vinyl sheet roll mounted on one side of a frame and a heat medium suspended from an upper surface of the frame sandwiching one side of the vinyl sheet roll fed from the vinyl sheet roll. A plate, a holding plate that faces the straightening plate and that can move up and down with respect to the standing direction of the frame, and that sandwiches the other side of the original vinyl sheet, and a lifting means that controls the lifting of the holding plate; A large number of guide rolls provided on the other side of the frame and for guiding the straightened vinyl sheet material, and a vinyl sheet provided between the frames and for carrying or processing the straightened vinyl sheet material. A material feeding device, a vinyl package die-cutting device continuously provided in the lateral direction of the frame, and a conveyer for conveying vinyl package die-cut products. Vinyl sheet winding curl correction device comprising apparatus and a provided.