JP3338091B2 - Decurling device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an apparatus for removing curls of a synthetic resin raw material used for manufacturing cards such as prepaid cards.

[0002]

2. Description of the Related Art Conventionally, a prepaid card is manufactured by printing a synthetic resin raw material and thereafter punching the printed raw material for each card by a punching machine.

[0003] The web is generally made of a sheet material such as polyethylene terephthalate, and the surface of the web is subjected to offset printing by a printing machine.

[0004] The raw material is continuously supplied to the printing press from the supply roll, but it is necessary to remove the curl of the raw material wound up from the supply roll before entering the printing press.

[0005]

As described above, since the raw material is continuously supplied from the supply roll to the printing press, it is necessary to remove the curl of the raw material.

As a method of removing the curl, there are a method of repeating winding and rewinding, a method of applying tension to the raw material with a bar, and a method of removing the curl of the raw material through a plurality of rollers. It is considered.

However, since the synthetic resin raw material is easily plastically deformed and the surface is easily damaged, it is difficult to reliably remove the curl without damaging the surface.

The present invention has been made in view of the above points, and it is an object of the present invention to provide a curl removing device capable of reliably removing curls without damaging the surface of a raw material. I do.

[0009]

SUMMARY OF THE INVENTION According to the present invention, there is provided a method for unwinding a continuous sheet of synthetic resin used for manufacturing a card from a take-up / supply roll formed by winding a continuous sheet-like sheet in the circumferential direction. In a curl removing device that removes curl from the unwound continuous raw material and sends the curl to the printing press side, the curl removing device is disposed downstream of the winding supply roll and winds the raw material around the winding supply roll. It consists of a heating device for heating to a heating temperature corresponding to the diameter, and a plurality of rollers arranged alternately in the upper and lower two stages along the transport direction of the raw material on the downstream side of the heating device. A curl removing roller group for winding the material roll to remove the curl of the material roll, and a cooling device disposed downstream of the curl removing roller group, and each roller of the curl removing roller group Gradually from upstream to downstream Has diameter increases, the winding angle of the original fabric is decurler, characterized in that gradually decreases toward the downstream side from the upstream side.

[0010]

[Function] Since the amount of deformation of the raw material by each roller of the curl removing roller group decreases from the upstream side to the downstream side along the transport direction of the raw material, the raw material is relatively easily plastically deformed. Also, the curl can be effectively removed.

[0011]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 4 show a first embodiment of a curl removing device according to the present invention.

In FIG. 1, a curl removing device 10 according to the present invention for removing a curl of a raw material 20 is provided downstream of a supply roll 18 for supplying a synthetic resin, for example, a polyethylene terephthalate (PET) raw material 20. Are arranged.

The curl removing device 10 includes a guide roller 13 for guiding the raw material 20, a curl removing roller group 12 provided downstream of the guide roller 13, and a cooling roller provided downstream of the roller group 12. Device 14. The guide roller 13, the curl removing roller group 12, and the cooling device 14 are housed in a frame 15.

In the vicinity of the supply roll 18, a supply roll 1 is provided.
A winding diameter measuring device 21 for measuring the winding diameter of No. 8 is provided,
The winding diameter measuring device 21 is connected to a heating temperature calculating device 22 that calculates a heating temperature corresponding to the winding diameter of the supply roll 18.

The heating temperature calculation device 22 is connected to a correction calculation device 23, and the correction calculation device 23 is connected to a temperature sensor 16 disposed between the heating device 11 and the roller group 12. The temperature sensor 16 measures the surface temperature of the raw material 20 heated by the heating device 11, and inputs the measured value to the correction operation device 23. Then, the correction operation device 23 corrects the signal from the heating operation device 22 based on the input signal from the temperature sensor 16 and operates the heating device 11 to heat the raw material 20 to a predetermined temperature by using the corrected signal. Has become.

Next, referring to FIG. 2, the curl removing roller group 1 will be described.
2 will be described in detail.

As shown in FIG. 2, the curl removing roller group 12 includes a plurality of upper rollers 25a, 25b, 25c disposed in the transport direction of the raw fabric 20, and upper rollers 25a, 25c.
5b, 25c and the upper rollers 25a,
A plurality of lower rollers 26a, 26b, 2 for winding the web 20 between the webs 25b, 25c and removing the curl of the web 20
6c.

Each roller 25a, 25b, 25c, 26
a, 26b, 26c have substantially the same diameter, and the winding angle of the raw material 20 around the rollers 25a, 25b, 25c, 26a, 26b, 26c gradually decreases from the upstream side to the downstream side. are doing. That is, in order from the winding angle θ1 of the lowermost roller 26a, the winding angle θ2 of the upper roller 25a,
The winding angles θ1 to θ6 gradually decrease to the winding angle θ3 of the lower roller 26b, the winding angle θ4 of the upper roller 25b, the winding angle θ5 of the lower roller 26c, and the winding angle θ6 of the upper roller 25c. I have.

Each of the rollers 25a, 25b, 25c, 2
Among the rollers 6a, 26b, and 26c, the distance between adjacent rollers in the transport direction decreases from the upstream side to the downstream side. That is, the lower roller 26a and the upper roller 2
5a, upper roller 25a and lower roller 26
b, lower roller 26b and upper roller 25b
, The distance between the upper roller 25b and the lower roller 26c, and the lower roller 26c and the upper roller 25c.
Are gradually decreasing.

Next, the operation of this embodiment having the above configuration will be described.

First, the raw material 20 is supplied to the curl removing device 10 from the supply roll 18. In this case, the printing material (not shown) on the downstream side of the curl removing device 10
The feed rate and tension of zero are adjusted.

Next, the raw material 20 is heated by the heating device 11 and sent to the curl removing roller group 12. In this case, the winding diameter of the supply roll 18 is measured by the winding diameter measuring device 21 provided on the supply roll 18, and the measured winding diameter is input to the heating operation device 22. Then, the heating operation device 22 calculates the heating temperature of the heating device 18 corresponding to the winding diameter of the supply roll 18.

The heating temperature of the heating device 11 is calculated as follows.

As shown in FIGS. 3 and 4, for example, when the transport speed of the raw material 20 is 20 m / min, the supply roll 1
As the winding diameter of No. 8 gradually decreases from 350 mm to 200 mm, the optimum heating temperature changes from 50 ° C to 80 ° C. Therefore, the heating temperature of the heating device 11 is controlled by the supply roll 1.
In accordance with the decrease in the winding diameter of 8, the temperature is adjusted to the optimum heating temperature. For example, when the winding diameter is 350 mm, the optimum heating temperature is 50 ° C., and when the winding diameter is 300 mm to 250 mm, the optimum heating temperature is 70 ° C., and the winding diameter is 200 mm.
In this case, the optimum heating temperature is 80 ° C. Where winding diameter 2
The optimum heating temperature of 80 ° C. for the case of 00 mm corresponds to the glass transition point of polyethylene terephthalate.

The floating amount of the raw material in FIG. 3 is the floating amount when a sample of 400 mm × 260 mm is prepared from the raw material 20 from which the curl has been removed, and this sample is placed on a horizontal plane. 4).

The signal from the heating arithmetic unit 22 is input to the correction arithmetic unit 23. The measured value of the surface temperature of the raw material 20 is input from the temperature sensor 16 to the correction operation device 23, and the signal from the heating operation device 22 is corrected by the correction operation device 23. Feedback control is performed.

Next, the raw material 20 is a curl removing roller group 1.
2 and then the upper roller 2 of the roller group 12
5a, 25b, 25c and lower rollers 26a, 26b, 2
The curl of the raw material 20 is removed while sequentially passing through the area 6c. In this case, the upper rollers 25a, 25a of the roller group 12
5b, 25c and lower rollers 26a, 26b, 26c
Angles θ1 to θ6 of the raw material 20 gradually decrease from the upstream side to the downstream side.
Among the rollers 5b, 25c, 26a, 26b, and 26c, the distance between adjacent rollers in the transport direction also gradually decreases from the upstream side to the downstream side. For this reason, in the roller group 12, the deformation amount of the raw fabric 20 gradually decreases, and the deformation frequency of the raw fabric 20 gradually increases.

Here, the amount of deformation means the degree of deformation of the raw material 20, and when wound around rollers of the same diameter, the larger the winding angle, the larger the deformation amount and the same winding angle. In this case, the smaller the roller diameter, the larger the deformation amount.

The deformation frequency refers to the frequency of deformation applied to the raw material 20, and when the transport speed of the raw material 20 is constant, the deformation frequency increases as the distance between adjacent rollers in the transport direction decreases.

When the amount of deformation of the heated raw material 20 is gradually reduced from the upstream side to the downstream side and the frequency of deformation is gradually increased, relatively plastic deformation such as the synthetic resin raw material 20 occurs. The curl can be effectively removed from a material that is easily processed. This has been confirmed experimentally for the following reasons. That is,
The large deformation on the upstream side allows the supply roll 18
Can be effectively removed regardless of its strength. Further, by gradually reducing the amount of deformation toward the downstream side and increasing the frequency of deformation, it is possible to suppress the re-formation of the curl generated in the curl removing roller group 12 to a small extent. The raw material 20 from which the curls have been removed by the curl removing rollers 12 immediately enters the cooling device 14 and is cooled. Cooling device 14
The raw material 20 cooled by the above process is again cured to a normal raw material hardness while the curl is cooled, and is conveyed to the printing press side.

As described above, according to the present embodiment, the heated raw material 20 is placed in each of the rollers 2 in the curl removing roller group 12.
5 a, 25 b, 25 c, 26 a, 26 b, 26 c, and during this time, the winding angle of the raw material 20 around each roller is gradually reduced to reduce the amount of deformation of the raw material 20 and gradually reduce the distance between the rollers. By increasing the frequency of deformation
Curls can be effectively removed from a material that is relatively easily deformed plastically. Further, since the raw material 20 is passed through the curl removing roller group 12 after being heated, the curl can be removed without damaging the surface of the raw material 20 as compared with the case where the raw material 20 is stiffened in a low temperature state.

Next, a second embodiment of the curl removing device according to the present invention will be described with reference to FIG. A second embodiment is:
Only the configuration of the curl removing roller group 12 is different.
The rest is substantially the same as the first embodiment shown in FIGS.

In FIG. 5, the curl removing rollers 12
Denotes a plurality of upper rollers 25a, 25b, 25c arranged along the transport direction of the raw fabric 20, and upper rollers 25a, 25c.
5b, 25c and a plurality of lower rollers 26a, 26b, 26c which are arranged differently from each other.

Each roller 25a, 25b, 25c, 26
a, 26b and 26c have substantially the same diameter, and the winding angles θ1 to θ6 of the raw material 20 around the rollers 25a, 25b, 25c, 26a, 26b and 26c are from the upstream side to the downstream side. And gradually decreasing.

Each roller 25a, 25b, 25c, 2
Among the rollers 6a, 26b, and 26c, the distance between the rollers adjacent in the transport direction gradually increases from the upstream side to the downstream side. For this reason, in the roller group 12, the amount of deformation with respect to the web 20 gradually decreases, and
The deformation frequency for 0 gradually increases.

When the amount of deformation of the heated raw material 20 is gradually reduced and the frequency of deformation is gradually increased, the material is easily deformed plastically and effectively removes curl from a material such as polyethylene terephthalate. It has been experimentally confirmed that this can be performed.

Next, a third embodiment of the curl removing device according to the present invention will be described with reference to FIG. The third embodiment differs only in the configuration of the curl removing roller group 12.
The rest is substantially the same as the first embodiment shown in FIGS.

In FIG. 6, the curl removing rollers 12
Are a plurality of upper rollers 25a, 25b, 25c disposed along the transport direction of the raw fabric 20, and upper rollers 25a, 25a, 25c.
25b, 25c and a plurality of lower rollers 26a, 26b, 26c alternately arranged.

Each roller 25a, 25b, 25c, 26
The diameters of a, 26b, and 26c gradually increase from the upstream side to the downstream side in the transport direction, and the winding angle of the raw material 20 around each roller decreases from the upstream side to the downstream side. are doing. Therefore, each roller 25a, 25b, 25c,
The amount of deformation of the web 20 due to 26a, 26b, 26c gradually decreases from the upstream side to the downstream side. Further, each roller 25a, 25b, 25c, 26a, 2
Among the rollers 6b and 26c, the distance between adjacent rollers in the transport direction is substantially constant. For this reason,
The deformation frequency for 0 is substantially constant.

When the amount of deformation of the heated raw material 20 is gradually reduced and the frequency of deformation is substantially constant, it is easy to plastically deform and effectively remove curl from a material such as polyethylene terephthalate. Has been experimentally confirmed.

[0041]

As described above, according to the present invention,
The curl can be effectively removed without damaging the material that is relatively easily deformed by plastic deformation.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view showing a first embodiment of a curl removing device according to the present invention.

FIG. 2 is a detailed side view of a curl removing roller group of the curl removing device shown in FIG.

FIG. 3 is a diagram showing a relationship between a heating temperature by a heating device and a floating amount of a raw sheet.

FIG. 4 is a side view showing the floating amount of the raw material.

FIG. 5 is a detailed side view of a curl removing roller group showing a second embodiment of the curl removing device.

FIG. 6 is a detailed side view of a curl removing roller group showing a third embodiment of the curl removing device.

[Explanation of symbols]

 Reference Signs List 10 curl removing device 11 heating device 12 curl removing roller group 14 cooling device 18 supply roll 20 raw material 25a upper roller 25b upper roller 25c upper roller 26a lower roller 26b lower roller 26c lower roller

──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Keiichi Kotani 1-1-1, Ichigaya-Kagacho, Shinjuku-ku, Tokyo Dai Nippon Printing Co., Ltd. (56) References JP-A-62-189137 (JP, A) JP-A-60-2559 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B41F 23/04 B65H 23/34 B29C 53/00-53/84

Claims (1)

(57) [Claims] An unrolled continuous roll of synthetic resin used for manufacturing a card is wound from a take-up supply roll formed by winding a continuous roll of synthetic resin in the circumferential direction. In a curl removing device that removes curl from the raw material and sends it to the printing press side, the curl removing device is disposed downstream of the take-up supply roll, and the raw material is heated to a heating temperature corresponding to the take-up diameter of the take-up supply roll. A heating device for heating, comprising a plurality of rollers arranged alternately in two stages in the upper and lower stages along the transport direction of the raw material on the downstream side of the heating device,
A curl removing roller group that winds the raw material between the rollers to remove curl of the raw material, and a cooling device that is disposed downstream of the curl removing roller group; Each roller in the group gradually increases in diameter from the upstream side to the downstream side, and the wrapping angle of the raw material gradually decreases from the upstream side to the downstream side. apparatus.