JPS63420Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an apparatus for covering the surface of a sheet body such as a card or bill with a plastic film so as to be in close contact therewith.

Recently, various sheet body surface coating devices have been proposed and are already commercially available in response to requests for imparting or improving durability and water resistance to sheet bodies such as "commuter passes" and "mini calendars." There is.

There are a wide variety of designed products for this type of equipment, but to give one example, Figure 1 shows a type of equipment that has a heating mechanism that uses a recently developed heat radiation lamp such as a halogen lamp as its heat source. To explain the section, a pair of rollers 13A, 13B are arranged so as to face each other in the sheet movement path P to constitute the pressing roller 1, and each roller 13A, 1
Thermal radiation lamps 5A and 5B are provided so as to face the surface of 3B with a space in between, and the reflective mirror is provided with heat insulators 42A and 42B on the outside so as to surround the press roller 1 and the thermal radiation lamps 5A and 5B. 4A, 4B
The sheet body 2, on which the plastic film 3 is stacked on both sides, is sent along the sheet body moving path P so as to pass between the rollers 13A and 13B. Both sides of the sheet body 2 are covered by fusion bonding to both sides of the sheet body 2 by the heat from the rollers 13A and 13B.

By the way, the plastic film 3 used to cover the sheet body 2 is composed of, for example, a high melting point plastic layer 31 located on the outside and a low melting point plastic layer 32 located on the inside, as shown in FIG. The plastic layer 32 has a low melting point and is bent to sandwich the sheet body 2 between the edges.
When the plastic film 3 passes between the pressure rollers 1, it is heated and softened to become adhesive. Therefore, the plastic film 3 is fused to both sides of the sheet body 2.
However, as shown in FIG. 3, a part of the plastic layer 32 softened when passing between the pressure rollers 1 protrudes outside the outer periphery of the plastic film 3, and this protrusion occurs. In some cases, plastic may adhere to the pressure roller 1. As the surface of a large number of sheets is coated, a large amount of plastic becomes attached to the surface of the pressure roller 1, and when a new sheet 2 is inserted between the pressure rollers 1 in this state, Since the plastic attached to the surface of the pressure roller 1 has adhesive properties, the surface of the plastic film 3 superimposed on the sheet body 2 adheres to the pressure roller 1 and wraps around it, thereby damaging the sheet body 2. Even if the plastic film 3 is not wrapped, plastic from the surface of the pressure roller 1 will adhere to the surface of the plastic film 3 and appear as dirt. This phenomenon similarly occurs in the pressure roller 1 of an apparatus having a hot plate type heating mechanism, and is particularly noticeable when the thickness of the sheet body is small.

Conventionally, in order to prevent this phenomenon, the pressure roller was removed or left attached, and the plastic adhering to the roller surface was scraped off using a metal piece. Since the plastic is firmly adhered to the surface of the pressure roller, it is troublesome to scrape it off, and the surface of the pressure roller may be damaged during the operation.

The present invention was developed based on the above circumstances, and it is possible to suitably supply mold release oil to the surface of the plastic film stacked on the sheet body, and it is possible to suitably supply mold release oil to the surface of the plastic film stacked on the sheet body. It is possible to prevent the plastic film from sticking to the surface of the pressure roller, thereby preventing the plastic film from wrapping around the sheet body, and to prevent the surface of the plastic film covering the sheet from becoming dirty. The purpose is to provide a sheet body surface coating device that can easily remove even if a part of the plastic film adheres to the sheet body. The sheet body surface coating device for coating the sheet body with the plastic film includes a mold release oil supply mechanism provided upstream of the pressing roller and supplies mold release oil to the surface of the plastic film, The release oil supply mechanism includes a pair of application rollers provided so as to be in contact with each other via the sheet body movement path, and a contact force of the release oil supply roller provided in opposition to the application rollers with respect to the application roller. A contact force adjustment mechanism is provided.

An embodiment of the present invention will be explained below with reference to the drawings. Fig. 4 is a vertical sectional side view showing an embodiment of the sheet body surface coating apparatus of the present invention, and P shows the movement of the sheet body 2 on which the plastic film 3 is stacked. This is the sheet movement path. On this sheet body movement path P,
A pressure roller 1 consisting of a pair of rollers 13A and 13B is arranged, and the surface of this pressure roller 1 is coated with release oil such as silicone oil in advance as required, and the surface of the rollers 13A and 13B is moved into a space 14A. , 14B, reflecting mirrors 4A and 4B are provided on both sides of the sheet movement path P, and
Heat insulators 42A and 42B constituting the outer casing 41 are disposed outside the reflecting mirrors 4A and 4B, and the rollers 1
Thermal radiation lamps 5A and 5B, such as halogen lamps, which constitute a heating mechanism together with the pressure roller 1 are placed in the spaces 14A and 13B so as to face the surfaces of the spaces 14A and 13B.
43A and 43B provided in 14B are preheating plates,
44A and 44B are cooling plates. A release oil supply mechanism 6 for supplying release oil to the surface of the plastic film 3 is provided at a position upstream of the pressure roller 1 in the sheet movement path P, for example near the entrance 411 of the outer casing 41. . As shown in FIGS. 5 to 8, this mold release oil supply mechanism 6 has rotary shafts that are pivotally supported by machine frames 601A and 601B, which are provided so as to face each other via a sheet body movement path P. a lower application roller 62, and an upper application roller whose rotating shafts are pivotally supported by movable pieces 605A, 605B provided on machine frames 601A, 601B so as to be movable up and down so as to oppose this lower application roller 62 by its own weight. 61, a first release oil supply roller (hereinafter simply referred to as "first supply roller") 63, which is provided so as to be able to move toward and away from the lower application roller 62 by a contact force adjustment mechanism 60, which will be described later. A second release oil supply roller (hereinafter simply referred to as "second supply roller") 64 is provided so as to be able to move toward and away from the supply roller 63.
A mold release oil tank 6 is provided so that the lower surface of the second supply roller 64 is immersed in the mold release oil, and in which mold release oil such as silicone oil is stored.
5. 603A, 603A
and 603B, 603B are machine frames 601A, respectively.
and guide grooves provided in 601B, 604A, 60
4A, 604B, and 604B are movable pieces 6, respectively.
The guide groove 60 provided in 05A and 605B
This is a guide edge that engages with 3A, 603A and 603B, 603B in a vertically movable manner.

As shown in detail in FIG. 8, the contact force adjustment mechanism 60 will be explained with respect to one end of the axis of each roller (right side in FIG. 5). 610A is fixed in position relative to the machine frames 601A and 601B. This fixed piece 610A has guide edges 609A, 609A extending up and down on both sides thereof, and is provided on the rotating shaft of the lower application roller 62 via a bearing. A base 613A of a pressure plate 617A is fixed to the upper part of this fixed piece 610A, and this pressure plate 617A is T-shaped with flanges 614A, 614A extending on both sides. 60
6A is a so-called U-shaped roller holding frame, and has flanges 622A, 622A facing the flanges 614A, 614A on the upper part thereof, and guide grooves 608A, 608A extending vertically provided on the inner wall side of the frame allow the above-mentioned Guide edges 609A, 6 of fixed piece 610A
09A so as to be slidable up and down. 61
6A and 616A are pressure screws, and these pressure screws 616A and 616A are respectively connected to the pressure plate 6.
The flanges 622A, 62 of the roller holding frame 606A extend through the flanges 614A, 614A of the roller holding frame 606A.
It is screwed onto 2A. 615A, 615A are springs provided along the pressure screws 616A, 616A;
A is inserted between the heads of the pressure screws 616A, 616A and the flanges 614A, 614A of the pressure plate 617A, and due to its elastic force, the heads of the pressure screws 616A, 616A are connected to the flanges 614A, 614A. 61
A force is applied in a direction away from 4A. In this way, the pressure plate 617A and the roller holding frame 606A are connected, and the pressure screw 6
When tightening 16A and 616A, the roller holding frame 6
06A moves upward, and conversely the pressure screw 616
When A, 616A is loosened, the roller holding frame 606
A moves downward. 612A is a movable piece,
This movable piece 612A has guide grooves 608A, 60 of the roller holding frame 606A provided on both sides thereof.
8A, the roller holding frame 606 is
The rotary shaft of the first supply roller 63 is pivotally supported on this movable piece 612A via a bearing. The second supply roller 64 has its rotation axis connected to the roller holding frame 606.
It is pivotally supported at the bottom of A via a bearing,
It is movable integrally with the roller holding frame 606A. The other end of the shaft of each roller is constructed in the same manner as the above-mentioned one end, and the corresponding same components are designated with the symbol "B" instead of the symbol "A".
Shown with .

One shaft end 6 of the lower application roller 62
The shaft end 618A is provided with a sprocket 619, and a chain (not shown) is suspended on the sprocket 619. ) is connected, for example, to a drive motor (not shown) that drives the pressure roller 1, and this drive motor rotationally drives the pressure roller 1 and the lower application roller 62, and among the respective rollers, the lower application roller 62 is excluded. , upper application roller 61,
First supply roller 63 and second supply roller 64
is a driven roller.

In the embodiment with such a configuration, by activating the pressure roller 1 and the heat radiation lamps 5A and 5B, the surface of the pressure roller 1 and the preheating plate 4 are heated.
3A, 43B are heated by the radiant heat from the heat radiation lamps 5A, 5B, and when the surface of the press roller 1 reaches a predetermined temperature, the sheet body 2 is moved along the sheet body movement path P via the mold release oil supply mechanism 6. When the plastic film 3 is fed, the mold release oil supply mechanism 6
When passing between the coating rollers 61 and 62, the release oil supplied to the surfaces of the coating rollers 61 and 62 is applied to the entire surface of the plastic film 3, that is, the entire upper surface and lower surface. Become so. That is, when the lower application roller 62 is rotationally driven by the drive motor, the upper application roller 61, the first supply roller 63, and the second supply roller 64 are respectively rotated, and among them, the roller 62 is immersed in the mold release oil. Release oil adheres to the surface of the second supply roller 64, which is
3 to the surfaces of the upper coating roller 61 and the lower coating roller 62, and this mold release oil is applied to both surfaces of the plastic film 3. This plastic film 3 is then applied to the preheating plate 4.
After being preheated by 3A and 43B, the pressure roller 1
The low melting point plastic layer located inside the plastic film 3 is softened by the heat from the pressure roller 1, and the plastic film 3 is pressed by the pressure roller 1.
are pressed onto both sides of the sheet body 2. Thereafter, the plastic film 3 passes through cooling plates 44A, 44B and is discharged.

In the above embodiment, the pressure roller 1
Since mold release oil is applied to the entire surface of the plastic film 3 that reaches the pressure roller 1, the mold release oil applied to the surface of the plastic film 3 is transferred to the surface of the pressure roller 1 when it passes between the pressure rollers 1. Therefore, the surface of the pressure roller 1 is
Even if the mold release oil is carried away by the plastic film 3, it is replenished by the following plastic film 3, so that the mold release oil is always coated. Therefore, even if a part of the low melting point plastic layer of the plastic film 3 protrudes from the outer periphery of the plastic film 3 due to pressure from the pressure roller 1, the protruding plastic will not adhere to the surface of the pressure roller 1. It is discharged from the pressing roller 1 together with the plastic film 3, and as a result, the plastic film 3 is prevented from being wrapped around, and the surface of the plastic film 3 covering the sheet body 2 is prevented from being stained. Therefore, even if a part of the plastic film 3 were to adhere to the surface of the pressure roller 1, it could be easily removed.

The first supply roller 63 and the second supply roller 64 are driven rollers that rotate as a result of the rotation of the application roller 62.
As the mold release oil adheres to the surface of the coating roller 2, the slippage between the application roller 62 and the first supply roller 63 increases until the rotation of the first supply roller 63 stops. When the mold release oil on the application rollers 61 and 62 is removed by the plastic film 3, the rotational frictional force between the application roller 62 and the first supply roller 63 increases, causing the first supply roller 63 to rotate. The mold release oil is supplied from the first supply roller 63 to the application roller 62. Then, when the amount of mold release oil on the surfaces of the application rollers 61 and 62 is restored again, the rotation of the first supply roller 63 is stopped in the same manner as described above. In this way, the applicator rollers 61 and 62 are supplied with an amount of release oil corresponding to the amount of release oil carried away by the plastic film 3. And pressure screw 616
The rotation of the first supply roller 63 is stopped by adjusting the contact force between the application roller 62, the first supply roller 63, and the second supply roller 64 using A, 616A and 616B, 616B. The amount of release oil on the application roller 62 when slipping occurs can be set in advance so that
A suitable amount of mold release oil can always be applied to the plastic film 3, so that the plastic film 3 is not coated with an excessive amount of mold release oil to the extent that it becomes sticky, for example.

Then, a plurality of mold release oil supply rollers, namely a first
By using the two supply rollers 63 and 64, even between the first supply roller 63 and the second supply roller 64, the application roller 62 and the first supply roller 63 can be Since the same effect of regulating the amount of mold release oil replenishment as in between is obtained,
The first supply roller 63 is now supplied with an amount of mold release oil that is transferred to the applicator roller 62 from the second supply roller 64 to compensate for the insufficient amount, and the mold release oil tank 65 is filled with mold release oil. The mold oil is supplied to the second supply roller 6
Even if a large amount of mold release oil adheres to the coating rollers 4, the application rollers 61 and 62 will not be supplied with excessive mold release oil.

The upper application roller 61 is a movable piece 605
A, 605B so that they can move up and down, the contact force between the upper application roller 61 and the lower application roller 62 through which the sheet body 2 passes is due to the weight of the upper application roller 61. Therefore, even if the thickness of the sheet body 2 is large, the coating can be suitably applied with uniform pressure without applying excessive force.

In the above, the mold release oil may be stored in the mold release oil tank 65 as it is, or may be stored in a state in which a sponge, felt, etc. are impregnated with it. Also the first
The supply roller 63 is omitted and the second supply roller 6 is used.
4 may be in direct contact with the lower application roller 62, or an appropriate number of other supply rollers may be provided between the first supply roller 63 and the second supply roller 64. . The application roller 61, the application roller 62, and the second supply roller 64 are preferably rubber rollers, but the first supply roller 63 may be a rubber roller or a metal roller.

FIG. 9 shows an example in which a release oil supply mechanism is provided in a sheet body surface coating device of another design, in which heat storage bodies 8A and 8B are used to cover the surfaces of rollers 13A and 13B of the pressure roller 1 with a gap between them. The heaters 81A, 81B are buried in the heat storage bodies 8A, 8B, and the entrance 41 of the outer casing 41 (insulation bodies 42A, 42B) covers the outside of the heat storage bodies 8A, 8B.
The mold release oil supply mechanism 6 is provided near the outer casing 41, and the cooling roller 82 is arranged near the outlet of the outer casing 41. FIG. 10 shows an example in which a mold release oil supply mechanism is provided in a sheet body surface coating device of still another design, and includes hot plates 9A and 9B equipped with heaters 91A and 91B and heat insulating plates 92A and 92B on the back side. Sheet body movement path P
The conveying roller 93 and the release oil supply mechanism 6 are arranged in order toward the upstream side of the hot plates 9A and 9B in the sheet body moving path P, and the hot plates 9A and , 9B is provided with a pressure roller 1 on the downstream side. In the apparatus shown in FIG. 10, the positions of the release oil supply mechanism 6 and the conveyance roller 93 may be reversed.

As described above, the present invention provides a sheet body surface coating device that heats and presses a plastic film stacked on a sheet body to cover the sheet body with the plastic film, which is provided on the upstream side of the pressing roller. It has a mold release oil supply mechanism that supplies mold release oil to the surface of the plastic film,
The release oil supply mechanism includes a pair of application rollers that are provided to face each other via a sheet movement path, a release oil supply roller that is provided to face the application roller, and this release oil supply roller. The sheet body surface coating device is characterized in that it is equipped with a contact force adjustment mechanism for adjusting the contact force with respect to the applicator roller, so that mold release oil is suitably supplied to the surface of the plastic film stacked on the sheet body. be able to,
It is possible to prevent a part of the plastic film from adhering to the surface of the pressing roller, thereby preventing the plastic film from being wrapped around the sheet body, and preventing stains from forming on the surface of the plastic film covering the sheet body. Even if a portion of the plastic film were to adhere to the surface of the pressure roller, it could be easily removed.

In addition, the heating mechanism, rollers, and their drive mechanism,
Of course, the reflecting mirror, heat storage body, heating plate, etc. may be designed in various ways using conventional techniques.

[Brief explanation of the drawing]

Fig. 1 is an explanatory cross-sectional view showing an example of a conventional sheet body surface coating device, Fig. 2 is a cross-sectional view showing the structure of a plastic film superimposed on the sheet body, and Fig. 3 shows that the surface of the sheet body is covered with plastic film. An explanatory diagram showing a coated state, FIG. 4 is an explanatory sectional view showing an embodiment of the present invention, and FIGS. 5 to 7
The figures are an explanatory vertical front view, an explanatory right side view, and an explanatory plan view showing an example of the mold release oil supply mechanism, respectively, and FIG. 8 is an explanatory vertical right side view showing the main parts of the mold release oil supply mechanism, FIGS. 9 and 10 are explanatory sectional views showing other embodiments, respectively. P... Sheet body, 13A, 13B... Roller,
1...Press roller, 5A, 5B...Heat radiation lamp, 4A, 4B...Reflector, 42A, 42B...
Heat insulator, 2... Sheet body, 3... Plastic film, 31, 32... Plastic layer, 43
A, 43B... Preheating plate, 44A, 44B... Cooling plate, 601A, 601B... Machine frame, 61, 62...
...Applying roller, 63, 64... Release oil supply roller, 605A, 605B... Movable piece, 60... Contact force adjustment mechanism, 65... Release oil tank, 610A, 6
10B... Fixed piece, 617A, 617B... Pressure plate, 606A, 606B... Roller holding frame, 60
8A, 608B...Guide groove, 615A, 615
B... Spring, 616A, 616B... Pressure screw, 612A, 612B... Movable piece, 619
... Sprocket, 8A, 8B ... Heat storage element, 81
A, 81B...Heater, 82...Cooling roller, 9
1A, 91B... Heater, 92A, 92B... Heat insulation plate, 9A, 9B... Heat plate, 93... Conveyance roller.

Claims (1)

[Claims for Utility Model Registration] In a sheet body surface coating device that heats and presses a plastic film stacked on a sheet body to cover the sheet body with the plastic film, the sheet body surface coating device is provided on the upstream side of a pressing roller. The mold release oil supply mechanism includes a mold release oil supply mechanism that supplies mold release oil to the surface of the plastic film, and the mold release oil supply mechanism includes a pair of application rollers that are provided so as to be in contact with each other via a sheet body movement path; A sheet surface coating device comprising: a release oil supply roller provided in opposition to the application roller; and a contact force adjustment mechanism that adjusts the contact force of the release oil supply roller to the application roller. .