JP6120062B2 - Thermal adhesive film laminating method and apparatus - Google Patents

Description

  In the present invention, a cover film (hereinafter referred to as a cover film) having a heat-sensitive adhesive layer is bonded to a sheet-like substrate, and the curling generated in the bonding step is prevented when the surface of the substrate is given gloss and a protective function. The present invention relates to a method and an apparatus for bonding a thermal adhesive film having a function.

  For surface processing on thin substrates such as seals, labels, magazine covers, and posters intended for application of the present invention, a transparent plastic film coated with a sticky adhesive at room temperature is used as a cover film It is common to do. However, in this method, the adhesive adhesive layer must be protected with release paper until it is laminated, and the release paper must be treated as waste after use. There are problems of high prices and industrial waste.

  On the other hand, as a method not using release paper, a release layer such as silicon is formed on the surface of the cover film, and a cellophane tape is used to replace the release paper to protect the adhesive adhesive layer (for example, Patent Document 1). However, in this method, there are drawbacks in that the workability deteriorates due to peeling resistance when the cover film wound in a roll shape is unwound, and printing on the surface of the peeling layer becomes difficult.

  In addition, a method of using a cover film having a heat-sensitive adhesive layer as in the present invention has been put into practical use in part, but the sheet-like product bonded by preheating the cover film prior to bonding is a cover film. There is still a problem that the side curl is generated on the side, and it has not been possible to completely remove the restrictions on use. (For example, Patent Documents 2 and 3)

  JP 05-39462 A   Japanese Patent Laid-Open No. 06-155579   JP 2010-23473 A

The present invention intends to further effectively improve the curl prevention in the heat lamination methods shown in Patent Documents 2 and 3 by another means.
In the heat lamination method shown in Patent Documents 2 and 3, the cover film is heated to bring the heat-sensitive adhesive layer into a sticky state, and then the pressure roll is pressed and adhered to the substrate. In this method, the cover film made of plastic with a large coefficient of thermal expansion is bonded and fixed to the base material in a state where it is expanded and stretched by preheating. The phenomenon of warping curl has not been sufficiently suppressed. Therefore, it has not been used extensively in place of the method using a sticky adhesive.

  The object of the present invention is to realize a thermal bonding film laminating method and apparatus that can more effectively suppress the occurrence of curling of the sheet-like laminated product described in the paragraph (0006). Is.

Means to solve the problem

In the present invention, as a method for eliminating the influence of the preheat elongation of the cover film on the curling of the sheet-like bonded product, the cover film generated by the heating roll is provided by installing the crimping portion shown in claim 1 after the heating roll. It has been found that the effect of the elongation of curl on the curl can be suppressed.
The structure of the crimping part is an elastic roll on the contact side with the cover film, and a pressure roll made of a material harder than the elastic roll on the side in contact with the base material. The pressure roll bites into the elastic roll with the cover film and the base material at the pressure-bonding point of the pressure roll and deforms along the pressure roll. At this time, it is effective to prevent curling by winding a cover film or the like around the pressure roll and reducing the diameter of the pressure roll. The feature of this crimping part is that the curling of the bonded product can be controlled freely by changing the combination of the material and roll diameter of the elastic roll and pressure roll, and the thin base with low rigidity can be controlled. It was possible to prevent warping even with wood. Moreover, the curl prevention effect was confirmed also in the experiment which used the material of the base material as a seal printing base material, a thin paper simple substance, plastics, etc. As a result, the inventions of claim 1 and claim 3 were reached.

  Furthermore, in the present invention, as a result of various experiments as an auxiliary means for achieving the above object, in addition to claims 1 and 3, it is also possible to prevent the curling by applying tension to the base material before guiding the base material to the crimping portion. This is effective, leading to the inventions of claims 2 and 4.

  The problem solving means (0008) and (0009) can be employed alone or in combination. The solution means (0008) and (0009) can be used for a thin base material with little rigidity, and any one of the solution means can be used for a base material with high rigidity.

Effect of the invention

As described above, according to the method and apparatus for attaching a thermal adhesive film of the present invention, curling of a bonded product can be suppressed to a practical range, and a bonded product without using a release paper can be manufactured. . Costs can be reduced and industrial waste can be reduced by eliminating the need for release paper.
In addition, the conventional thermal laminating method including the conventional Patent Documents 2 and 3 can be applied to a thin base material that is not practically used due to curling.

It is a schematic side view which shows embodiment of this invention.

1: Heating roll 2: Elastic roll 3: Pressure roll 4: Tension adjusting roll 5: Tension detecting roll 6: Guide roll 7: Cover film (consisting of a stretched polypropylene film and a heat-sensitive adhesive layer)
7-1: Heat-sensitive adhesive layer of cover film 7-2: Stretched polypropylene film of cover film 7-3: Movement direction of cover film 8: Substrate 8-1: Unprinted portion of substrate 8-1: Base Material printing part 8-3: Movement direction of substrate 9: Bonded product (bonding substrate, heat-sensitive adhesive layer, stretched polypropylene)
9-1: Direction of bonded product movement 10: Tension adjustment mechanism

FIG. 2 is a schematic side view showing an enlarged main part of the embodiment of the present invention shown in FIG. The explanation of the reference numerals is the same as in FIG.

A preferred embodiment for carrying out the present invention will be described with reference to FIG. The cover film 7 is unwound from the unwinding portion and heated by the heating roll 1 having a sufficient amount of heat to melt the heat-sensitive adhesive layer, and then travels in the direction of the arrow and is guided to the pressure bonding portion.
The elastic roll 2 is preferably made of silicon rubber having a diameter larger than that of the pressure roll and made of non-adhesive and having a Shore hardness of 70 or less.
The pressure roll 3 preferably has an elastic roll diameter or less. The material is preferably made of metal, but may be made of rubber or plastic as long as the hardness is equal to or higher than the elastic roll.
The base material 8 is guided from the unwinding portion to the tension adjusting roll 4, travels toward the crimping portion through the tension detection roll 5, and is bonded to the cover film at the crimping portion. It is appropriate that the substrates are bonded together with a tension of about 100 to 300 N / 200 mm applied by a tension adjusting mechanism. A pressure of about 0.1 to 0.15 Mpa / 200 mm is applied to the pressure-bonding portion, the cover film and the base material are overlapped, the pressure roll bites into an elastic roll having a lower hardness, and the elastic roll is deformed into a concave shape. At this time, the base material is placed so as to be wound around the pressure roll before the pressure-bonding point, and is also wound after being bonded. The winding angle is about 90 to 180 degrees around the crimping point. Thereafter, the bonding process is completed through the guide roll 6.
Although this preferred example has been described with the intention of being applied to seals and labels, if the width of the device is increased to about 1 m, the width size can be increased for a bonding device for magazine covers, posters, etc. It can be made small and applied to a desktop office machine.
Curling is unavoidable on paper bases with low rigidity in current large machines and desktop office machines, so it is common to use paper with a basis weight of 130 g / m ² or more. It was confirmed that the paper was practically usable with a single paper having a basis weight of 84.9 g / m ² . Theoretically, it can be applied to less paper.

As a result of an experiment under the following conditions using the heat bonding film laminating apparatus shown in FIG. 1 incorporating the claims 3 and 4, a result of an upper curl curl within 5 mm immediately after the laminating is obtained. After the time winding, the curl was within 3 mm.
In addition, the paper simple substance which is a base material used by the present Example used the thing which belongs to a thin category, and tends to generate | occur | produce a curvature warp, as a base material used with a normal seal, a label, a magazine cover, etc.
Conditions Heating roll diameter: 120 mm metal heat roll Heating roll temperature: 100 ° C.
Elastic roll: 200 mm roll diameter coated with silicon rubber on the surface, 70 degree Shore hardness Pressurized roll: Aluminum alloy material, 40 mm diameter
Pressure 0.1Mpa
Base material tension: 200 N / 200 mm width Cover film: Stretched polypropylene film 15 μ / Low melting point PE 15 μ
Base material: Coated paper (basis weight 84.9 g / m ² ) simple substance Laminating speed: 50 m / min

As a result of an experiment under the following conditions using the apparatus shown in FIG. 1 on a base material (paper tack made of release paper and adhesive processed paper) that is generally used as a paper seal, it is immediately after bonding. The curl of the peeled paper seal was almost 0 mm.
Heating roll diameter: 120 mm metal heat roll
100 ° C
Elastic roll: roll diameter 200 mm with surface coated with silicon rubber, hardness 70 degrees Pressurizing roll: aluminum alloy material, diameter 30 mm
Pressure 0.1Mpa
Cover film: stretched polypropylene film 15μ / low melting point PE15μ
Substrate: Paper seal (paper basis weight 104.8 g / m ² )
Bonding speed: 70m / min

As a result of experiment using synthetic paper (product name YUPO) tack as the material of the base material and other conditions being the same as in Example 1, the seal was peeled off from the release paper immediately after bonding, and a result of curling up to 5 mm or less was obtained. It was.
In addition, by reducing only the pressure roll diameter to 30 mm under the same conditions, it was confirmed that the curl was slightly warped and the curl direction could be controlled.
Base material: YUPO (synthetic paper) seal (YUPO thickness 60μ)

As a result of experiment using PET tack as the material of the base material sheet and other conditions being the same as in Example 1, the seal was peeled off from the base material immediately after bonding, and a result of curl of 5 mm or less was obtained.
Base sheet: PET tack (PET thickness 50μ)

In the conventional method for determining whether or not the curl size is acceptable, and the method using the adhesive adhesive described in paragraph (0002), the size of the curl is generally 5 mm or less.
In the measurement method, the sheet was placed on a flat surface, and in the case of a seal, the release paper was peeled off, and the upper warp or the lower warp length at the terminal was measured.

  This method and apparatus can be employed even in the case of a single wafer cut into a desired size, even when the substrate is a continuous web.

  The material of the cover film that can be used in the present invention is a stretched polypropylene film, a stretched polyester film, a stretched nylon film, cellophane, and the like, and a heat-sensitive adhesive such as a polyethylene resin is laminated thereon.

  The substrate used in the present invention is a printed or plain stretched polyester sheet, a stretched polypropylene film, a simple substance such as paper, or a tack sheet or the like obtained by laminating release paper on the back side thereof.

Claims (4)

A cover film made of a plastic film having a heat-sensitive adhesive layer is heated with a heating roll, and bonded to a substrate via a heat-sensitive adhesive layer at a pressure bonding portion made of an elastic roll and a pressure roll. a method of manufacturing a combined product, crimp portion elastic roll cover film side, is arranged a pressure roll made of a material having a hardness greater than the elastic roll to the substrate side, the crimp portion previously cover film which is heated Then, it is guided to the crimping part without contacting the base material, and the elastic film is pressed and bonded so that the elastic roll becomes concave while the cover film, the base material and the bonded product are wound around the pressure roll. Bonding method Heat according to claim 1, characterized in providing more tension adjusting mechanism comprising a roll for controlling tension brakes the tension detecting roll and the substrate base material, the tension before directing the substrate to the crimping portion Adhesive film bonding method. A cover film made of a plastic film having a heat-sensitive adhesive layer is heated with a heating roll, and bonded to a substrate via a heat-sensitive adhesive layer at a pressure bonding portion made of an elastic roll and a pressure roll. a method of manufacturing a combined product, crimp portion elastic roll cover film side, is arranged a pressure roll made of a material having a hardness greater than the elastic roll to the substrate side, the crimp portion previously cover film which is heated Then, it is guided to the crimping part without contacting the base material, and the elastic film is pressed and bonded so that the elastic roll becomes concave while the cover film, the base material and the bonded product are wound around the pressure roll. Bonding device To provide the tension before directing the substrate to the crimping portion, according to claim 3, further comprising a tension adjusting mechanism comprising a roll for controlling tension brakes the tension detecting roll and the substrate of the substrate Thermal bonding film laminating device.

Images