JPH01214425A - Print laminating and its device - Google Patents

Abstract

PURPOSE:To smooth the surface of a thermo-fused film and prevent the curling and breaking of the film, by winding the thermo-fused film around a heating roll via a metallic endless belt to heat it and then positioning a printed matter on a press roll side and laminating said film and said printed matter with thermo-compression bonding. CONSTITUTION:At a corona discharge treatment section 7, a thermo-fused film 3, of which surface has been treated by corona discharge, and jetting has been corrected by a jetting adjustment roll 20 and an expander roll 21, and of which rumples are straightened, passes through the contact point B of a film draw-out rolls 22, 23, makes contact with the preheating section 9a of a heating roll 9 at a contact point C via a metallic endless belt 11 to be preheated. While the preheated thermo-fused film 3 passes through the contact point A of a heating roll 9 and a press roll 18 on heating side, it is laminated instantaneously on the printed surface of a sheet-fed printed matter 2. This sheet-fed printed matter 2 which has been laminated with thermo-compression bonding is immediately cooled in a cooling section 13 in the state of closely contacting on the metallic endless belt 11.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method and an apparatus for laminating a film on the surface of a printed matter or the like.

(Prior Art) Conventionally, it has been widely practiced to laminate a plastic film on the surface of printed matter, etc. to protect the printed surface, impart water resistance, oil resistance, and gloss the printed surface.This lamination method In the coach ink section of the laminating machine, adhesive dissolved in an organic solvent is applied to the Plus Deck film, the organic solvent is evaporated through a drying process, and the adhesive-coated surface of the Bustic film and the printed matter are bonded under heat and pressure. In addition, JP-A-60-184826 is known as a method that does not use organic solvents.This is a method that does not use organic solvents. When laminating a lamination film onto printing paper, an endless metal belt with a mirror-finished surface is stretched between a heated metal roll and an auxiliary roll installed along the film transport direction, and these heated metal Using a device in which a pressure roll is provided opposite to the roll via a metal endless belt, the base film layer is placed between the metal endless belt and the pressure roll in this device toward the metal endless belt side. The print lamination film and printing paper are fed so that the printing paper is placed on the pressure roll side, and the print lamination film is laminated with heat and pressure on the printing paper, and then the film is laminated with heat and pressure on the printing paper, and then the film is placed in close contact with the metal endless belt. This is a method of polishing by removing and transporting the material.

[Problem to be solved by the invention]

However, the method of using organic solvents described in (1) above has problems with work safety such as fire hazards, health management of workers, etc.
There are environmental conservation issues such as odor and air pollution. In addition, in this method, when thermocompression bonding a plastic film and a printed matter, the higher the temperature, the better the gloss will be, but since the organic solvent cannot be completely evaporated in the drying process, residual organic solvent will be removed during thermocompression bonding. This results in foaming and poor appearance. When thermocompression bonding is carried out in a low temperature range to suppress this foaming phenomenon, there are disadvantages such as insufficient gloss.

In addition, in the method (2) which does not use organic solvents, the print lamination film is not preheated and the contact point between the heating metal roll and the pressure roll via the endless metal belt is used to attach the printing paper to the printing paper as shown in Figure 5. Since the film for print lamination is laminated, there is no preheating effect for the film for this purpose. Therefore, this film does not melt or soften sufficiently, and air tends to accumulate between the printing paper and the film, making it difficult to bond them neatly. In addition, when this device is stopped, if polyethylene film is used for this film, the film will melt at the point where it comes into contact with the heated metal roll through the endless metal belt and will be easily cut, causing the temperature of the heated metal roll to increase. It is difficult to do the work. Furthermore, in the case of the conventional example described above, preheating with hot air or infrared rays may be considered, but this would cause the film to shrink and cause curling after lamination. Also, as shown in Figures 6 and 7, it is easily possible to preheat the film by wrapping it around a heated metal roll via an endless metal belt, but as in the case described above, curling may occur. This is likely to occur, and there is a risk of the film breaking.

In addition, in the conventional example (2), the print lamination film is laminated onto the printing paper using a pair of heated metal rolls and pressure rolls, so the laminating force is small, and there is a risk that the film may peel off from the printing paper in some cases. be.

Furthermore, in the conventional example of (2), especially when polyethylene film is used as a print lamination film, polyethylene does not have good adhesive properties, so the film peels off from the printing paper after lamination, and in effect, the polyethylene film is used as a print lamination film. It could not be used as a film.

Therefore, in view of the above circumstances, the present applicant has developed a heat-sealable film that has good gloss and a smooth surface without causing any problems in terms of environmental conservation, without causing foaming or air accumulation, and The first objective is to provide a print laminating method that does not cause curling or film breakage during thermocompression lamination.

In addition to the first object, a second object is to provide a print laminating method using a thermocompression laminating machine.

In addition to the first and second purposes, it is also important to note that when a heat seal film is used for thermocompression lamination, even if a polyethylene film is used as the thermocompression film, the thermocompression film may peel off from the printed matter. The third object is to provide a print laminating method that does not require the following steps.

Furthermore, a fourth object is to provide a print laminating apparatus for achieving the first, second, and third objects.

[Means to solve the problem]

In order to achieve the above-mentioned first object, the print laminating method of the '1st invention involves laminating a heat-sealable film onto printed matter by thermocompression bonding, by passing the film through a metallic endless belt whose surface is mirror-finished. When the film is passed between a heating roll and a pressure roll that are in contact with each other, first and second film drawing rolls that rotate at approximately the same circumferential speed as the heating roll are brought into contact with each other, and the second film drawing roll is In a film preheating section formed by making the heating rolls face each other via the metal endless belt, the heat-sealing film is passed through the first and second film pull-out rolls and then through the metal endless belt. The heating roll is preheated,
The printed matter and the heat sealing film are fed so that the printed matter is positioned on the pressure roll side, and the heat sealing film is thermocompression laminated onto the printed matter.

In addition, in order to achieve the second object, the print laminating method of the second invention includes the step of thermocompression laminating the printed matter immediately after thermocompression laminating the heat fusion film on the printed matter by the print lamination method of the first invention. The printed matter is cooled by passing between a cooling roll and a pressure roll that are in contact with each other via an endless metal belt.

Further, in order to achieve the third object, the print laminating method of the third invention includes the above-mentioned step before sending the heat-adhesive film used in the print laminating methods of the first and second inventions to the film preheating section. Corona discharge is applied to the surface of the heat sealable film, and the heat sealable film is easily laminated to printed matter by thermocompression bonding.

Furthermore, in order to achieve the fourth object, the print laminating device of the fourth invention is provided along the transport direction of the heat-adhesive film in order to achieve the print laminating method of the first to third inventions. A metal endless belt stretched between a heating roll and a holding roll and having a mirror-finished surface, and first and second film pull-out rolls that rotate at approximately the same circumferential speed as the heating roll. and the heating roll is brought into contact with the second film pull-out roll through the metal endless belt, and the heating roll and the pressure roll are brought into contact with each other through the metal endless belt. It consists of a film preheating section provided on the upstream side in the transfer direction of the heat-sealable film from the counter contact point, and a cooling roll and a pressure roll that are in contact with each other via an endless metal belt. A cooling section provided downstream in the transport direction and near the contact point between the heating roll and the pressure roll, which are in contact with each other, and a corona discharge on the surface heat-sealing film before being sent to the film preheating section. The apparatus is equipped with a corona treatment section that facilitates thermocompression lamination of the heat-sealing film onto printed matter.

[For production]

According to the print laminating method of the first invention having the following configuration, the circumferential speed of the first and second film drawing rolls is as follows:
Since the circumferential speed of the heating roll is equal to the transport speed of the mirror-finished endless metal belt, and the heat-sealing film is in close contact with these rolls, curling is less likely to occur, and the heat-sealing film is Enables sufficient preheating without cutting, and allows the mirror-like state of the endless metal belt to be transferred to the surface of the heat-sealing film. Air is not trapped between the heat-sealing film and the printed matter, and the printed matter is heat-fused cleanly. The adhesive film can be heat-sealed and laminated. After the heat-sealing film is cooled and hardened, it can be easily peeled off from the metal endless belt.

Further, according to the second invention, after the heat-sealable film is thermocompression-bonded and laminated on the printed matter by the printing lamination method of the first invention, the printed matter is immediately laminated with a cooling roll that is in contact with the printed material via an endless metal belt. In order to cool the printed matter by passing it between the pressure roll and the heat-pressing roll, the thermo-compression laminated printed matter passes through an endless metal belt, so there is a time lag in heat transfer at the point of contact between the cooling roll and the pressure roll. The result is the same as applying pressure, the thermo-compression bonded laminate becomes more complete, cooling is also performed, and the heat-bonded film can be easily peeled off from the metal endless belt.

Further, according to the third aspect of the present invention, if a corona discharge is applied to the surface of the heat-sealable film before sending it to the film preheating section, the heat-sealable film after heat-sealing lamination becomes difficult to peel off from the printed matter. This tendency is particularly strong when the heat-sealable film is made of polyethylene.

Furthermore, according to the fourth invention, the heat-sealing film is corona-treated in the corona treatment section to make it easier to adhere the heat-sealing film to the surface of the printed matter, and then the heat-sealing film is treated in the preheating section without causing curling or breakage of the film. By preheating and passing the heat sealing film and printed matter between a heating roll and a pressure roll that are in contact with each other via an endless metal belt, the heat sealing film is heat-pressed and laminated onto the printed matter, and then immediately cooled. Since the heat-sealing film is cooled by the heat transfer time lag, the result is the same as applying pressure again with a heating roll, and the heat-sealing film can be easily peeled off from the metal endless belt.

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to FIGS. 1 to 4.

FIG. 1 is a side view schematically showing a preferred apparatus (print laminating apparatus of the present invention) to which the print laminating method of the present invention is applied. In the figure, reference numeral 1 denotes a print laminating device, and the print laminating device 1 laminates a heat sealing film 3 by thermocompression bonding on the printing surface of a sheet-fed printed matter (printed material) 2, and feeds the sheet-fed printed material 2. paper 1
- a paper feeder 4, a registration section 5 for transporting and aligning the sheet printed matter 2 sent out from the paper feeder 4, a supply section 6 for the heat-sealing film 3, and a paper feeder 4 for transporting and aligning the sheet printed matter 2 fed from the paper feeder 4; a corona treatment section 7 that performs corona treatment on the heat-sealable film 3, a film preheating section 8 that preheats the corona-treated heat-sealable film 3, and the sheet-fed printed matter 2 transferred from the registration section 5.
The heat-sealing film 3 unwound from the supply unit 6 on the printed surface of the film is stretched between a heating roll 9 and a holding roll 10 provided along the transport direction of the heat-sealing film 3. A laminate section 12 that performs thermocompression lamination and polishing by heat transfer through an endless belt 11, and a cooling section that cools and re-presses the thermal adhesive film 3 and printed matter 2 that have been thermocompression laminated by the laminate section 12. 13, a cutter section 14 for cutting the thermal adhesive film 3 that has been laminated by thermocompression bonding, and a stacking section 15 for stacking sheet-fed printed matter 2° that has been laminated.

The paper feeder 4 is provided with a mounting table 1G.
6, the sheet-fed printed matter 2 described above is placed with its printed side facing up. This mounting table 16 is movable up and down, and the northernmost sheet-fed printed matter 2 is placed between the upper part of the feeder 4 and the laminating section 12 at a point 161 located approximately in the water. It is adjusted so that it is at the same height as the top surface of the conveyor 17 of the section 5. As shown in FIG.
The laminate part 12 is placed on the laminate part 12 with its front end aligned.
sent to.

The heating roll 9 and the holding roll IO are provided in the laminating section 12 along the transport direction of the heat sealing film 3, respectively. The metal endless belt 11 is stretched between the heating roll 9 and the holding roll 10. This metal endless belt 11 is
A stainless steel plate with a mirror surface is used. By using the metal endless belt (1) which is a stainless steel plate with a mirror surface, the heat-sealing film 3
By softening or melting the film with the heating roll 9, it becomes possible to transfer the mirror-like state to the surface of the heat-sealing film 3. Moreover, if this heat-sealing film 3 is cooled and hardened, it can be easily peeled off from the metal endless belt 11.

Furthermore, this laminating portion 12 is provided with a heating side pressure bonding roll 18 that is in contact with the heating roll 9 . and,
This heating side pressure bonding roll 1B is provided with a hydraulic cylinder (not shown), and it is possible to freely apply a necessary linear pressure between the heating side pressure bonding roll 1B and this hydraulic cylinder.

Further, the supply section 6 is provided with a roll (paper tube) 19 around which the heat sealing film 3 is wound. As described above, the corona treatment section 7, the film meandering adjustment roll 20, and the wrinkle smoothing expander roll 21 are provided on the delivery side of the heat-sealable film 3 unwound from the roll 19. When a corona discharge is applied to the surface of the heat sealing film 3 in the corona treatment section 7, the heat sealing film will have good adhesion when it is thermocompression laminated to the sheet-fed printed matter 2. be. This effect is particularly high in the case of polyethylene film. The heat-sealing film 3 that has passed through these rolls 20 and 21 is preheated by the film preheating section 8 before being sent to the contact point A between the heating roll 9 and the heating-side pressure roll 18.

The film preheating section 8 is provided with first and second film pull-out rolls 22 and 23, respectively, which rotate at substantially the same speed as the circumferential speed of the heating roll 9. The first film pull-out roll 22 and the second film pull-out roll 23 are in contact with each other. Further, the second film pull-out roll 23 and the heating roll 9 are in contact with each other via the metal endless belt 11.

As shown in FIG. 1, the heat-sealing film 3 whose meandering has been corrected and wrinkled by the film meandering adjustment roll 20 and the wrinkle-removal expander roll 21 is moved to a first film drawer that rotates counterclockwise. roll 2
2 and the second film pull-out roll 23 rotating clockwise, the film passes through the opposite contact point B as if being pulled in, and is further heated at the opposite contact point C between the second film pull-out roll 22 and the heating roll 9. The roller 9 is brought into close contact with the preheating section 9a of the roll 9 via a metal endless bell 11, and is preheated. By this preheating, the heat sealing film 3 is softened or partially melted. As shown in FIG. 3, this heat-sealing film 3 has a two-layer structure consisting of at least a base film layer 3a and an adhesive layer 3b. The base film layer 3a is O
Consists of PP, CPP, PV, PET, etc. or,
The adhesive layer 3b is preferably a solvent-free type that uses a heat-sensitive adhesive resin and has a melting point lower than that of the base film layer 3a. The heat-sealable film 3 is made by applying, co-pressing, or extrusion laminating the adhesive layer 3b on the base film layer 3a.

The foliage printed matter 2 sent to the laminating section 12 is
The printed surface of the heat-sealing film 3 supplied from the film preheating section 8) heats and presses the laminate in the process of passing through the contact point A between the heating roll 9 and the heating-side pressure roll 18 of the laminating section 12. be done. That is, the non-printing surface of the sheet-fed printed matter 2 is brought into contact with the heating-side pressure bonding roll 18, and the heat-sealing film layer 3a of the heat-sealing film 3 is brought into contact with the heating roll 9 via the metal endless belt 11. The sheet-fed printed matter 2 and the heat-sealable film 3 are connected to the heating roll 9 of the laminating section 12 and the heating-side pressure roll crystal so that the printed surface of the sheet-fed printed matter 2 comes into contact with the adhesive layer 3b of the heat-sealable film 3. Sent to counter contact A. As mentioned above, since the metal endless belt 11 is wrapped around the heating roll 9 and is sufficiently heated, the sheet-fed printed matter 2 is The heat-adhesive film 3 is instantly heat-pressed and laminated onto the printing surface. The thermocompression laminated sheet printed matter 2 is immediately cooled in the cooling section I3 while being in close contact with the metal endless belt 1.

That is, this cooling unit 13 is disposed near the heating roll 9 between the heating roll 9 and the holding roll IO, and is connected to the cooling roll 24, the cooling side pressure roll 25 that is in contact with the cooling roll 24, and the cooling side pressure roll 25 that is in contact with the cooling roll 24. Water spouting vibe 26 and draining roll 27
It consists of And this cooling side pressure roll 25
is provided with a hydraulic cylinder (not shown), making it possible to freely apply the necessary linear pressure between the hydraulic cylinder and the hydraulic cylinder. Therefore, the thermocompression-laminated sheet printed matter 2 is transferred between the cooling roll 24 and the cooling-side pressure roll 25 in close contact with the metal endless belt 11, and is further pressed and cooled. At this time, the cooling roll 24 and the cooling-side pressure roll 25 are disposed near the laminating section 12, and the thermocompression-laminated printed matter 2 passes through the endless metal belt 11, so the cooling roll 24 and There is a time lag in heat transfer at the point of contact with the cooling side pressure roll 25, and the effect is the same as applying pressure again with the heating roll 9, making the thermocompression bonding lamination more complete and cooling. I will do it. Then, the water is drained by a draining roll 27, and the metal endless belt 11 and the base film 3 of the heat-sealing film 3 are separated by a holding roll 10.
A is peeled off and transferred to the cutter part 14, where the heat-sealing film 3 is cut for each sheet-fed printed matter 2, and the laminated sheet-fed printed materials 2° are stacked in the paper stacking section 5. can be lost.

〔Effect of the invention〕

As detailed above, according to the print laminating method of the first invention, the heat-adhesive film is preheated without curling or film breakage, the mirror surface of the metal endless belt is directly transferred, and air is removed. The printed material is laminated with thermo-pressure bonding in a clean condition. Therefore, a printed laminated product with a beautiful and glossy surface can be obtained, and since no organic solvent is used, there is no particular problem in terms of environmental protection, and there are effects such as no foaming phenomenon on the printed laminated surface.

In addition, according to the print laminating method of the second invention, after thermocompression lamination, the material is immediately cooled by passing between a cooling roll and a pressure roll, so there is an effect similar to that of thermocompression bonding again. Cooling is performed at the same time as the pressure-bonded laminate is completed, and the heat-sealed film can be smoothly peeled off from the endless metal belt. Therefore, in addition to the effect of the first invention, the heat-adhesive film is difficult to peel off and can be peeled off smoothly from the metal endless belt, so a printed laminated product without surface roughness can be obtained.

Further, according to the print laminating method of the third aspect of the invention, after the heat-adhesive film is unwound, the surface thereof is subjected to corona treatment to facilitate thermocompression bonding, so that the heat-adhesive film is less likely to peel off from the printed matter. This is particularly effective when polyethylene is used for the heat-adhesive film. Second, first
Alternatively, in addition to the effect of the second invention, it is possible to obtain a printed laminated product in which the heat-adhesive film does not easily peel off from the printed matter.

Furthermore, according to the print laminating apparatus of the fourth invention,
Since the method embodies the first, second, and third invention methods, a printed laminated product having the effects of the first, second, and third inventions can be easily obtained.

[Brief explanation of the drawing]

1 to 4 show embodiments of the present invention.
The figure is a side view showing an outline of the apparatus to which the print laminating method of the present invention is applied, FIG. 2 is a side view showing the feeding state of sheet-fed printed matter, FIG. 1 is a sectional view showing a state of thermocompression lamination, and FIGS. 5 to 7 are schematic diagrams showing a state of supply of a heat sealing film before conventional thermocompression lamination. 1...Print laminating device 2...
Sheet-fed printed matter (printed matter) 3...Heat sealing film 7...Corona treatment section 8...Film preheating section 9...Heating roll 10... ... Holding roll] 1 ... Metal endless belt] 3 - ... Cooling section 18 ... Heating side pressure roll (press roll) 22
......First film drawer roll 23...
Second film drawer roll 24... Cooling roll

Claims (4)

[Claims] (1) In order to heat-press and laminate a heat-sealable film onto a printed matter, when the film is passed between a heating roll and a pressure roll that are in contact with each other via a metallic endless belt whose surface is mirror-finished, the above-mentioned First and second film pull-out rolls that rotate at substantially the same circumferential speed as the heating roll are brought into contact with each other, and the heating roll is brought into contact with the second film pull-out roll via the metal endless belt. In the film preheating section, the heat-sealing film is heated to the first and second layers.
The printed material and the heat-sealing film are fed through a film pull-out roll, wrapped around the heating roll via the metal endless belt, preheated, and placed so that the printed material is positioned on the pressure roll side. 1. A print lamination method, which comprises laminating the heat-adhesive film onto a printed matter by thermocompression bonding. (2) Immediately after thermocompression laminating the heat-sealable film on the printed matter, the thermocompression-laminated printed matter is passed between a cooling roll and a pressure roll that are in contact with each other via an endless metal belt. The print laminating method according to claim 1, wherein the print laminating method is cooled. (3) Before sending the heat-sealing film to a film preheating section, corona discharge is applied to the surface of the heat-sealing film to facilitate thermocompression lamination of the heat-sealing film onto printed matter (
The print laminating method described in 1) or (2). (4) An endless metal belt stretched between a heating roll and a holding roll provided along the transfer direction of the heat-sealing film and having a mirror-finished surface, and a circumferential speed of the heating roll. First and second film draw-out rolls rotating at substantially the same speed are brought into contact with each other, and the heating roll is brought into contact with the second film draw-out roll via the metal endless belt, and the metal endless belt A film preheating section provided on the upstream side in the transfer direction of the heat-sealing film from the contact point between the heating roll and the pressure roll, which are in contact with each other via a belt, and a cooling part, which is in contact with each other via an endless metal belt. a cooling unit comprising a roll and a pressure roll, and provided downstream in the transport direction and near the contact point of the heating roll and the pressure roll, which are in contact with each other via the metal endless belt, and the film; A print laminating apparatus comprising: a corona treatment section that applies corona discharge to the heat sealable film before being sent to a preheating section to facilitate thermocompression lamination of the heat sealable film onto printed matter.