JPH02252531A - Dry laminator - Google Patents

Abstract

PURPOSE:To enhance both drying efficiency of a dryer and cutting efficiency of a cutter by disposing a group of electrode rods along the same plain surface, performing dielectric heating with an electric field developed along a feeding surface for a base film, and cutting a laminate sheet by a cutter blade driven to circulate by a wrap driving mechanism. CONSTITUTION:A cutter blade 27 is driven to circulate by a wrap driving mechanism 26, and skewly cross a feeding surface of a laminate sheet 9 in synchronism with the feeding velocity of the sheet 9, thereby cutting the sheet 9. When the circuiting timing of the cutter blade 27 is conformed to a length to which the sheet 9 is to be cut, the laminate sheet 9 can be efficiently cut continuously as it is fed continuously. A dryer 5 causes only water component contained in an adhesive layer to generate heat directly, by a dielectric heating action. A group of first and second electrode rods 19, 20 are disposed in parallel along either one of the upper and lower sides of the feeding surface for a base film 1, and an electric field E generated between the electrode rods 19 and 20 is developed along the feeding surface, whereby the electric field E can be constantly applied continuously to the adhesive layer being moved.

Description

[Detailed Description of the Invention] [Industrial Application Field] This invention involves bonding a base film to a base sheet using a water-soluble adhesive, and then cutting the film into a predetermined length to form paper sheets. This dry laminator for producing laminated sheets is designed to increase the processing speed of the entire device.

[Conventional technology]

Conventional dry laminators involve a coating process in which a solvent-based adhesive is applied to the base film using a coater;
A laminate sheet is formed through a drying process in which the applied adhesive is dried with a dryer, and a bonding process in which the base film is heat-pressed onto the sheet 1- and W materials.
38026).

When producing a sheet-like laminate sheet, a cutting step is provided following the bonding step, and the sheet is cut while the feeding of the laminate sheet is temporarily stopped or temporarily stopped.

As a dryer applied to the drying process, a hot air drying method is often used, which generates hot air using electric heat or combustion heat as a heat source, and blows the hot air onto the base film to dry it (for example, Japanese Patent Publication No. 62-50749). Public bulletin).

[Problem to be solved by the invention]

In dry laminators such as those mentioned above, the use of solvent-based adhesives tends to be restricted due to reasons such as contaminating the surrounding air with the solvent that evaporates during the drying process, or the high cost of the solvent itself. Water-soluble adhesives are increasingly being used in place of solvent-based adhesives.

However, water-soluble adhesives are difficult to dry compared to solvent-based adhesives, and if the film feed speed is to be constant, a long dryer is required. I had to slow down.

In other words, the overall working speed of the laminator was greatly influenced by the drying efficiency of the dryer.

In addition, in dry laminators that consistently produce sheet-like laminated sheets, the lamination processing speed is also affected by the cutting efficiency of the cutter, and in order to improve the working speed of the overall device, it is important to combine the drying process and cutting process. was the bottleneck. For example, even when producing a laminate sheet that does not require cutting, the feed rate could only be reduced to less than 5 m per minute.

The purpose of the present invention is to improve the drying efficiency of the dryer and the cutter, which are the bottlenecks when performing lamination processing, in the integrated production of paper-like laminate sheets bonded using a water-soluble adhesive using a dry laminator. The purpose is to improve the overall processing speed by improving the cutting efficiency of the device.

[Means to solve the problem]

Specifically, it is fixed to a winding drive mechanism 26 that diagonally traverses the running trajectory plane of the laminated sheet 9 and a transmission body 30 thereof, and moves the sheet 9 in synchronization with the feeding speed of the laminated sheet 9. The cutter device 11 is composed of the cutter blade 27 for cutting.

The dryer 5 performs drying using dielectric heating, and a high-frequency voltage is applied between a group of first electrode rods 19 and second electrode rods 20 that apply an electric field to the base film 1, and both electrode rods 19 and 20. It is equipped with a power supply device 16 that applies
The first and second electrode rods 19 and 20 are arranged in parallel along one example above and below the running surface of the base film 1. As the high frequency voltage, an alternating voltage in a so-called radio frequency band in the short wave or very short wave region is applied.

In the case where the base sheet 6 is a sheet of paper, the sheet feeding device 7 is arranged so that the adjacent ends 6a and 6b of the base sheet 6 in the front and back of the feeding direction are fed in a state in which they are vertically overlapped.
The cutter device 11 is configured so that the cutter blade 27 cuts the laminate sheet 10 while moving between the overlapping surfaces of the adjacent ends 6a and 6b in synchronization with the sheet feeding timing of the sheet feeding device 7.

[Effect]

The cutter blade 27 is cyclically driven by the winding drive mechanism 26, and cuts the running surface of the bonded sheet 90 diagonally across the running surface in synchronization with the sheet feeding speed. Therefore, if the circulation timing of the cutter blade 27 is made to match the cutting length of the laminated sheet 1-9, continuous cutting can be efficiently performed while the laminated sheet 9 is continuously fed.

The dryer 5 directly generates heat only from the moisture contained in the adhesive layer by dielectric heating. Moreover, the first and second electrode rods 1 are arranged along either the upper or lower side of the running surface of the base film 1.
By arranging a group of electrode rods 19 and 20 in parallel and aligning the electric field E generated between both electrode rods 19 and 20 along the running surface,
The electric field E can be continuously applied to the moving adhesive layer at all times.

〔Effect of the invention〕

As described above, in the present invention, the water-soluble adhesive 3 is dried by the dryer 5 that uses dielectric heating, and the group of electrode rods 19 and 20 are arranged along the same plane. The electric field E is applied along the running surface of the base film 1,
Since dielectric heating can be performed continuously, the adhesive layer can be dried efficiently, and the sheet feeding speed in the dryer 5 can be sufficiently increased. Furthermore, the laminated sheet 9 can be efficiently cut while being continuously fed by the cutter blade 27 that is cyclically driven by the winding drive mechanism 26.

Therefore, according to the present invention, the base film 1 and the base sheet 6 are bonded using a water-soluble adhesive, and the laminated laminated sheet 9 is cut to form a sheet-like laminate sheet 10. For integrated production, the sheet feeding speed of the entire apparatus can be greatly improved, and the productivity of sheet-like laminate sheets 10 can be improved.

Since the drying efficiency of the dryer 5 is high, compared to conventional hot air drying ovens, the oven length can be made sufficiently small while improving the sheet feeding speed (this makes it possible to reduce the space required for installing the dry laminator, and the hot air drying method It is also advantageous in that it can significantly reduce energy costs compared to other methods.

〔Example〕

1 to 8 show embodiments of a dry laminator according to the present invention.

In FIG. 1, the dry laminator includes a turret-type film supply bag W2 that supplies a rolled base film 1, a coating device 4 that applies a water-soluble adhesive 3 to the film 1, and a coating device 4 that applies a water-soluble adhesive 3 to the film 1. A dielectric heating type dryer 5 that dries the adhesive 3, a sheet supply bag W7 that continuously supplies a base sheet 6 made of sheet paper onto the running line of the base film 1 sent out from the dryer 5, and a base material. sheet 6
A laminating device 8 that laminates and adhesively fixes the base film 1 on the substrate, a cutter device 11 that cuts the laminated sheet 9 to a predetermined length to form a sheet-like laminate sheet 10, a stacker 12, etc. Consists of. Reference numeral 13 is a frame;
A dryer 5 is provided on the left half of the upper floor, and other devices are provided on the lower floor.

In FIG. 2, a kiss roll coater is used as the coating device 4, and the water-soluble adhesive 3 stored in a pan 4a is applied with a coating roll 4b. If necessary, a smoother is provided on the downstream side of the coating roll 4b in the sheet feeding direction to smooth the adhesive layer.

The dryer 5 includes a drying oven 15 and a power supply device 16, and performs drying by causing moisture contained in the adhesive layer to self-heat by dielectric heating. In FIG. 3, the drying oven 15 has a flat box-shaped oven body 17 shielded with a steel plate, and has a population 17a.
The base film 1 is placed at three locations at the outlet 17b and the center.
It has guide rollers 18 that define a running path. The central guide roller 18 is located above the other guide rollers 18, 18, so that the traveling path of the film 1 in the furnace as a whole forms a gentle mountain shape (see Fig. 1).
.

A large number of metal electrode rods 19 and 20 are arranged along the lower surface of the running surface of the base film 1 for applying an electric field E to the adhesive layer. The electrode rods are divided into a first electrode rod 19 and a second electrode rod 20, which are arranged alternately in parallel in a state perpendicular to the film feeding direction. The intervals between adjacent electrode rods 19 and 20 are all the same. As shown in FIG. 4, one group of first electrode rods 19 and one group of second electrode rods 20 are connected in parallel to different power supply paths 21 and 22, respectively.

The power supply device f 16 generates a high frequency voltage and applies it between the electrode rods 19 and 20 via the power supply paths 21 and 22. The high frequency voltage generated is from 3MHz to 30MHz
It belongs to the short wave frequency range of 30 MIIz to 300 MHz, for example, the frequency is 27.12 M
Hz, and the voltage value is adjusted to 10 kV. Reference numeral 23 in FIG. 3 is an attenuator provided to prevent electromagnetic waves from leaking to the outside.

As described above, the first and second electrode rods 19 and 20 are arranged along the running surface of the base film 1, and both electrode rods 19 and 20 are arranged along the running surface of the base film 1.
When a high frequency voltage is applied between the
is applied between the electrode rods 19 and 20 in an alternating manner, and the water molecules contained in the adhesive layer rotate violently while changing direction depending on the polarity of the electric field E, generating self-heating due to frictional heat. At this time, the base film 1 and the adhesive 3 do not generate heat, and only the moisture generates heat, so that thermal deformation of the base film 1 can be well prevented, and no foaming phenomenon or wrinkles will occur in the adhesive layer. .

The sheet supply device 7 is disposed adjacent to the bonding device 8, sucks the stacked base sheets 6 one by one with a suction member 7a, and continuously feeds them into the bonding device 8. At this time,
As shown in FIG. 5, front and rear adjacent base sheets 6, 6
, the rear adjacent end 6b is the front adjacent end 6.
The base material sheet 6 is supplied so as to overlap with a. The substrate sheet may be paper, plastic sheet, or metal foil.

In FIG. 1, the bonding device 8 includes a pair of upper and lower pressure rollers 8.
a, 8b, and a hydraulic cylinder 8d that presses the lower roller 8a via an auxiliary roller 8C, and presses the dried base film 1 and base sheet 6 with the pressure roller in a state where they overlap vertically. By feeding between 8a and 8b, the base film 1 is bonded and fixed to the base sheet 6. In order to keep the tension of the base film 1 constant during lamination, a suction roller 24 is provided between the dryer 5 and the coating device 4, and a tension detection roller 2 is provided in front of the lamination device 8.
According to the detected tension value of 5, the suction roller 24
The rotation speed can be controlled.

In FIGS. 7 and 8, the cutter device 11 includes a winding drive mechanism 26 that diagonally crosses the running surface of the laminated sheet 9;
It is composed of a motor (not shown) for rotationally driving this, a cutter blade 27, and the like. The winding drive mechanism 26 has sprockets 29, 29 rotatably supported on both ends of one side of a vertical frame 28, and a chain (transmission body) 30 is attached to both sprockets 29, 29. , attach the cutter blade 27 to the chain 30. chain 30
Chain guides 34 are respectively provided on the lower surfaces of the upper and lower straight running parts.

In order to change the transverse angle of the chain 30 according to the sheet feeding speed, one end of the frame 28 is swingably supported by a fulcrum shaft 31, and the other end is supported by a screw shaft 33 via a spherical joint 32. When the screw shaft 33 is rotated, the frame 28 swings either forward or backward in the sheet feeding direction via the spherical joint 32. The screw shaft 33 is supported so as to be laterally displaceable so as to absorb displacement of the spherical joint 32 during swinging.

The cutter blade 27 is formed in a U-shape when viewed from the side, and cuts the laminated sheet 9 at right angles while moving in the sheet feeding direction in synchronization with the feeding speed of the laminated sheet 9. At this time, the force lid blade 27 is attached to the adjacent end of the base sheet 6 as shown in FIG.
Only the base film 1 is cut while moving between the polymerized surfaces of a and 6b.

In order to ensure that the cutter blade 27 can move between the adjacent ends 6a and 6b, the winding drive mechanism 26 is rotationally driven in synchronization with the sheet feeding timing of the sheet feeding device 7.

The corner of the upper adjacent end 6b facing the cutting start end is bent upward in advance to facilitate the entry of the cutter blade 27.

The laminate sheets 10 cut by the cutter device 11 are pasted together by the stacker 12.

As explained above, when the adhesive 3 is dried using the dielectric heating effect, only the water contained therein can be heated. Moreover, the first and second electrode rods 19 and
By generating an electric field E along the running surface of the base film 1 during the 20-hour period, the electric field E is continuously applied to the adhesive layer in most areas while the base film 1 passes through the dryer 5. As a result, drying efficiency can be significantly improved.

Further, the laminated sheet 1-9 can be cut at high speed by the circulating cutter blade 27 in synchronization with the sheet feeding speed.

Therefore, for the entire device, the sheet feeding speed is approximately 50% per minute.
It became possible to increase the speed from m to Loom, and the productivity of the sheet-like laminate sheet 10 was improved. This speed increase is about 10 to 20 times that of a conventional laminator using a hot air drying oven.

[Another embodiment example]

The base sheet 6 may be a continuous sheet, and in this case, both the base sheet 6 and the base film 1 are cut at the same time by the cutter blade 27.

The group of first and second electrode rods 19 and 20 can also be arranged on the upper surface side of the base film 1. In some cases,
The electrode rod groups may be arranged vertically alternately in the first half traveling region and the second half traveling region.The electrode rods 19 and 20 do not necessarily have to be orthogonal to the sheet feeding direction, but may be arranged in an inclined manner. You can also do it. As long as the electrode rods 19 and 20 are parallel, they can be deformed into an L shape or a chevron shape, or they can be arranged concentrically.

The winding drive mechanism 26 can also be constructed using a timing belt as a transmission member.

The tension of the base film 1 can be adjusted by using a forced feed roller other than the suction roller 24, for example, a roller having an adhesive tape fixed around its circumferential surface.

[Brief explanation of drawings]

Figures 1 to 8 show an embodiment of the dry laminator according to the present invention, with Figure 1 being the overall layout, Figure 2 being a schematic front view of the coating device, and Figure 3 being the inside of the dryer. A plan view, FIG. 4 is a front view showing the arrangement structure of the electrode rods, FIGS. 5 and 6 are cross-sectional views showing the processed state of the laminated sheet, FIG. 7 is a plan view of the cutter device, and FIG. 8 is a front view of the cutter device. 1 ・ ・ 3 ・ ・ 4 ・ ・ 5 ・ ・ 6 ・ ・ 8 ・ ・ 9 ・ ・ 10 ・ 11 ・ 16 ・ 19 ・ 20 ・ 26 ・ 27 ・ 30 ・ Base film, adhesive, coating device, dryer, Base sheet, laminating device, laminating sheet, laminating sheet, cutter device, power supply device, first electrode rod, second electrode rod, winding drive mechanism, cutter blade, chain. Inventor: Kazuharu Okazaki

Claims (2)

[Claims] (1) A coating device 4 that applies a water-soluble adhesive 3 to a continuously supplied base film 1, a dielectric heating dryer 5 that dries the adhesive 3, and a continuously supplied base material. A laminating device 8 that laminates and adhesively fixes the base film 1 to the sheet 6, and a cutter device 11 that cuts the laminated sheet 9 in which the base sheet 6 and the base film 1 are laminated to a predetermined length. The cutter device 11 is fixed to a winding drive mechanism 26 that diagonally traverses the running surface of the laminated sheet 9 and a transmission body 30 of the winding drive mechanism 26, so that the cutter device 11 operates in synchronization with the feeding speed of the laminated sheet 9. The dryer 5 is housed in the furnace body 17 and is configured to be capable of continuous cutting with a cutter blade 27 for cutting the base film 1.
It has a group of first electrode rods 19 and second electrode rods 20 that apply an electric field to the electrode rods 19 and 20, and a power supply device 16 that applies a high frequency voltage in the short wave or ultra-high frequency region between the electrode rods 19 and 20. A dry laminator in which two electrode rods 19 and 20 are arranged in parallel along either the upper or lower side of the running surface of the base film 1. (2) It has a sheet feeding device 7 adjacent to the pasting device 8 that continuously supplies the sheet-like base material sheet 6, and the sheet feeding device 7 has an adjacent end 6a of the base material sheet 6 before and after the feeding direction. - The sheet is configured to be fed with the sheets 6b stacked one above the other, and the cutter blade 27 moves between the overlapping surfaces of the adjacent ends 6a and 6b in synchronization with the sheet feeding timing of the sheet feeding device 7. The cutter device 11 cuts the base film 1 while
The dry laminator according to claim 1, comprising: