JP4074103B2 - Film laminating apparatus and laminate film manufacturing method using the same - Google Patents

Description

【００１５】
【発明の効果】
以上説明したように、本発明によれば、無溶剤型接着剤によりフィルムの貼り合わせに際し、第１ラミネート部にて発泡、梨地を抑制し、テンションコントロール部、第２ミネート部によりフィルムのダメージを抑制し、トンネリング防止を可能としたことによって、従来から外観不良の発生により製品化が困難とされていたフィルム組み合わせでの包装用ラミネートフィルムとして前記発泡、梨地の発生のないラミネートフィルムを、フィルムのダメージ、トンネリングのない安定した加工条件での製造が可能となった。
【図面の簡単な説明】
【図１】本発明の実施に使用する無溶剤型ドライラミネーターの概略構成図である。
【図２】図１のラミネーターにおけるコーティング部周辺の構成を示した図である。
【図３】本発明の方法により製造したラミネートフィルムの構成図である。
【図４】従来の溶剤型ドライラミネーターの概略構成図である。
【図５】従来の無溶剤型ドライラミネーターの概略構成図である
【図６】従来のドライラミネーション法により製造したラミネートフィルムの構成図である。
【符号の説明】
ＤＬ ラミネート部
ＤＬ１ 第１ラミネート部
ＤＬ２ 第２ラミネート部
Ｇ ガイドロール
ＴＣ テンションコントロール部
ＳＲ 送りロールユニット
ＵＷ アンワインダ
ＲＷ リワインダ
ＶＭ 蒸着層
１ ラミネートフィルム
２ 第１基材
２ｅ ポリエステルフィルム
２ｏｐ ２軸延伸ポリプロピレンフィルム
３ 第２基材
４ 接着剤
１０ 本発明の無溶剤型ドライラミネート装置
１１ 第１基材
１２ 第２基材
１３ ラミネートフィルム
１４ 接着剤（接着剤貯留部）
１５ コーティング部
１５ａバックアップロール
１５ｂコーティングロール
１５ｃメータリングロール
１５ｄアプリケーションロール
１６ａ、１７ａ 加圧ゴムロール
１６ｂ、１７ｂ 加熱金属ロール
１８ 混合供給部
１９ 接着剤供給部
２０ 溶剤型ドライラミネート装置
２１ 第１基材
２２ 第２基材
２３ ラミネートフィルム
２４ 溶剤型接着剤（接着剤貯留部）
２５ コーティング部
２５ａ 加圧ゴムロール
２５ｂ 加熱金属ロール
２６ 乾燥ゾーン
２７ａ ゴムロール
２７ｂ 加熱金属ロール
２８ 冷却ロール
３０従来の無溶剤型ドライラミネート装置
３１ 第１基材
３２ 第２基材
３３ ラミネートフィルム
３４ 無溶剤型接着剤（接着剤貯留部）
３５ コーティング部
３５ａ バックアップロール
３５ｂ コーティングロール
３５ｃ メータリングロール[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a film laminating apparatus in which two films are bonded together with a solventless adhesive, and a method for producing a laminated film using the same, and suppresses foaming and satin generated after laminating, and has an appearance. The present invention relates to an apparatus and a method for manufacturing a good laminate film. In particular, the present invention relates to an apparatus and a method for producing a laminate film that can improve the appearance of a polyester film / adhesive / aluminum-deposited polypropylene film (non-stretched and stretched) that has been considered to have poor appearance.
[0002]
[Prior art]
Conventionally, as a laminating method for obtaining a flexible composite packaging material, an adhesive dissolved in an organic solvent is applied to the surface of a plastic film, the solvent is evaporated by hot air or heating, and the film to be bonded is laminated. A solvent-type dry lamination method for thermocompression bonding is known. This method is expensive compared to the wet lamination method in which bonding is performed while the adhesive is in a wet state, but the bonding process can be performed at high speed and efficiently, and the type of adhesive and the amount of application can be reduced. By selecting, it can be applied to almost all films, so that various laminate films having various properties necessary for packaging materials can be produced.
FIG. 4 shows a schematic configuration of a solvent-type laminator 20 that performs this dry lamination method. The outline of the solvent-type dry lamination process will be described with reference to FIG. 4. The adhesive 24 is applied to the first substrate 21 through the first substrate 21 through the coating portion 25 (generally a gravure coating method is adopted). After that, the adhesive 24 is dried through the drying zone 26 (generally, a hot air spraying method of 80 to 120 ° C. is adopted), and then the first base material 21 that has become an adhesive state through a drying process. The adhesive surface and the second substrate 22 are nipped and heat-bonded by a dry laminating portion DL composed of a rubber roll 27a and a heated metal roll 27b. At this time, the heated metal roll 27b is heated to 60 to 80 ° C.
Thereafter, it is cooled by the cooling roll 28 and wound up. The wound laminate film 23 is subjected to an aging treatment at 35 to 45 ° C. in order to accelerate the curing of the adhesive 24.
[0003]
Among the laminated films produced through this process, those used as packaging materials for foods use a film having a high elastic modulus, good heat resistance and dimensional stability as the outer film, and the contents side As this film, an aluminum vapor-deposited film having a heat sealing property that is softened at a relatively low temperature and having a gas barrier property to prevent the solvent from leaking to the contents side is employed. Laminated films that occupy the mainstream as such packaging materials for food are shown in FIGS. 6 (a) and 6 (b). Both base film 2e, 2op are bonded together via the inner film 3 and the adhesive layer 4, and the inner film 3 is an aluminum vapor deposition polypropylene (VMPP) film. The films 2e and 2op are a polyester (PET) film and a biaxially oriented polypropylene (OPP) film, respectively.
Here, the PET film in the laminate film 1 ′ in FIG. 6A has properties such as excellent heat resistance and dimensional stability, high rigidity, and high strength. Compared with PET film for such properties, the OPP film is inferior, has the advantages such as excellent moisture proofing and low price, so the laminated film 1 ″ in FIG. Widely used in packaging for snacks.
On the other hand, the dry lamination method using an adhesive containing an organic solvent as described above is an environmental pollution caused by an organic solvent, a problem in the Fire Service Act, a problem of solvent cost (including equipment cost for the solvent, etc.), etc. Currently, we have various problems. In the field of food packaging, a laminate film using a solvent-type adhesive has a residual solvent odor and is not preferable. Therefore, in recent years, manufacturers have provided adhesives that do not contain organic solvents, so-called solventless adhesives, and food packaging materials that use laminate films bonded through such adhesives are also available on the market. Some have been around.
Since this type of laminate film has various advantages such as energy saving, resource saving, environmental problems, no residual solvent, etc., a laminate film using a solventless adhesive is a laminate film using a solvent adhesive. It is thought that it will increase further in the future while coexisting.
[0004]
[Problems to be solved by the invention]
By the way, as shown in FIG. 5, a laminate film produced by a laminating method using a solventless adhesive that does not contain an organic solvent and produced by a solventless laminator (hereinafter referred to as a solventless laminate film) is There is a problem that the finished appearance is not good as compared with a solvent-type laminate film. That is, immediately after laminating, a state where a fine spot-like defect (foaming) or small unevenness (pear texture) occurs on both the uncoated surface and the printed surface is often received, and this appearance defect often disappears through the aging treatment, Depending on the type of film, foaming and satin may remain and the packaging material may have a poor appearance.
Although various improvements have been made on the operation side at the laminating site in order to suppress such appearance defects, they have not yet been completely solved. In particular, as a representative laminate film in which a specific film having a poor appearance is conspicuous, a biaxially stretched polyester film 2e and a vapor-deposited polypropylene film 3 shown in FIG. 6 (a) or a biaxial film shown in FIG. 6 (b) are used. Examples include laminate films 1 ′ and 1 ″ that are a combination of stretched polypropylene film 2op and vapor-deposited polypropylene film 3. In this type of film, minute spot-like defects and small irregularities remain visible and cannot be eliminated. As a result, it has a poor appearance and cannot be used as a packaging material.
An object of the present invention is to derive a truly appropriate laminating condition that does not cause appearance defects in a solvent-free type laminate film, and more particularly, a laminate of a PET film, a VMCPP film, and a VMOPP for which an improvement in appearance is desired. It is to enable processing.
[0005]
[Means for Solving the Problems]
The above problems can be solved by the following present invention. That is, the invention described in claim 1, in the production of laminated films to be processed in a solventless type adhesive, after applying the adhesive to the polyester film is a base film, a polyester film is a base film A first laminating part for press-bonding the aluminum vapor-deposited polypropylene film as a bonding film , a second laminating part for press-bonding the laminating film again immediately thereafter, and a tension between the first laminating part and the second laminating part are provided. Using a laminating apparatus that can be freely controlled, the temperature of the roller of the first laminating unit is heated to 50 ° C. or more and less than 100 ° C., and the temperature of the roller of the second laminating unit is the temperature of the roller of the first laminating unit. Production of a laminate film characterized by being set at a lower temperature of 0 ° C. or more and less than 20 ° C. Consisting of the law. In the invention described in claim 2, the tension between the first laminate part and the second laminate part is adjusted to 0 kgf / m or more and less than 15 kgf / m using the laminating apparatus described in claim 1. Is a manufacturing method characterized by In the invention described in claim 2, the solventless adhesive used in the manufacturing method described in claim 1 or claim 2 is a two-component mixed solventless adhesive in which the viscosity is lowered by heating. It is characterized by this.
[0006]
DETAILED DESCRIPTION OF THE INVENTION
The present invention relates to an apparatus for laminating a base film such as a polyester film or a biaxially stretched polypropylene film and a vapor-deposited polypropylene film in a good appearance, and processing conditions for processing using the apparatus. This will be specifically described.
[0007]
FIG. 1 is a schematic configuration diagram of a solventless dry laminator used in the practice of the present invention. FIG. 2 is a diagram showing a configuration around a coating portion in the laminator of FIG. FIG. 3 is a configuration diagram of a laminate film manufactured by the method of the present invention.
[0008]
That is, in the production of a laminate film processed with a solventless adhesive, after the adhesive is applied to a base film, a laminate part {circle around (1)} that presses the base film and the bonding film is laminated again immediately after. A film laminating apparatus comprising a laminating section (2) for pressure-bonding a film.
Furthermore, the temperature of the roller of the laminating section (1) is 50 ° C. or more and less than 100 ° C., and the temperature of the roller of the laminating section (2) is set to 0 ° C. or more and less than 50 ° C. A method for producing a laminate film.
A method for producing a laminate film, wherein the tension of the laminate part (1) and the laminate part (2) is adjusted to 0 kgf / m or more and less than 15 kgf / m.
5. The method for producing a laminate film according to claim 1, wherein the adhesive to be used is a solventless adhesive whose viscosity is lowered by heating.
[0009]
As a study for solving the above problems, the present inventor has adjusted the temperature of the nip roll from 0 ° C. to 90 ° C. in the non-sol laminator of FIG. There is film damage due to the tunneling and tension after heating (deterioration of the barrier when an inorganic barrier layer such as VMCPP is included), and at low temperatures, no film tunneling or film damage is observed, but foaming and satin are noticeable. As shown in FIGS. 1 and 2, the conventional laminate portion is used as the first laminate portion DL1, and a second laminate portion DL2 is newly provided. Further, the first laminate portion DL1 and the second laminate portion DL2 are provided. We found that the problem could be solved by providing a tension control part TC in between. It has led to the completion of the invention.
[0010]
In many cases, a four-roll coating method or a five-roll coating method is employed for the coating portion 15 in the dry laminator using a solventless adhesive. This embodiment is described with an example of a four roll coat system. In the coating portion, after the adhesive 14 is applied to the first base material 11, the first laminate portion DL1 (the rubber roll 16a and the heated metal roll 16b is placed while the second base material 12 is aligned with the adhesive surface of the first base material 11. ) Through the nip and tension control portion TC, and further nip with the second laminate portion DL2 (rubber roll 17a and heated metal roll 17b). The wound laminate film 13 is subjected to an aging treatment at a temperature of 35 ° C. to 45 ° C. in order to accelerate the curing of the adhesive.
[0011]
The coating unit 15 is an apparatus for applying the adhesive 14 whose viscosity is adjusted to an appropriate value by heating to the first base material 11, and adopts a known four-roll coating method as shown in FIG. The configuration is composed of four rolls of a backup roll 15a (metal), a coating roll 15b (rubber), a metering roll 15c (metal), and an application roll 15d (rubber) in order from the top. An adhesive reservoir is provided between the application roll 15d and the metering roll 15c, and the two-component mixed solventless adhesive 14 is supplied from the adhesive supply unit 18 thereto. The first base material passes between the backup roll 15a and the coating roll 15b, and the adhesive 14 stored in the adhesive reservoir is applied to the first base material 11 via the metering roll 15c and the coating roll 15b. Is done. Here, the backup roll 15a has a heating mechanism or the like, so that the temperature of the adhesive 14 applied to the opposite side of the first base material 11 with the first base material 11 interposed therebetween can be adjusted. Moreover, the coating amount (1-2 g / m <2>) of the adhesive agent 14 can be adjusted by adjusting the space | interval between each roll.
[0012]
Since the adhesive supply unit 19 uses the two-component mixed type adhesive 14, a system (tank, pump, these pipes) 19 a for supplying the main agent 14 a of the adhesive 14 and an auxiliary agent (curing agent) 14 b Is composed of a system (tank, pump, these pipes) 19b and an application jig 19c for mixing and supplying the main agent 14a and the auxiliary agent 14b. Here, the application jig 19c is positioned above the application roll 15d and the metering roll 15c, and has a structure capable of scanning in the width direction of both rolls. The viscosity of the adhesive 14 is lowered to some extent. After that, the supply to the adhesive reservoir is performed.
[0013]
【Example】
In this embodiment, using the non-sol (solvent-free) laminator shown in FIGS. 1 and 2, the temperature of the first laminate portion 16 is set to 80 ° C., the temperature of the second laminate portion 37 is set to 20 ° C., and the tension control 18 The tension of 10 kgf / m. Then, a first layer film to which the adhesive 14 is applied, that is, a PET (polyester) film on the first base material 11, and a second layer film to be bonded to the first base material 11, that is, a VMCP (aluminum-deposited polypropylene) on the second base material 12. ) Film was used. This combination of films is a combination of films that has been conventionally impossible to achieve good bonding.
The adhesive is a solventless adhesive (main agent: “A-695” manufactured by Takeshi Mitsui Chemicals, Inc., “A-95” manufactured by Mitsui Takeda Chemicals), and a temperature of 70 ° C. (coating viscosity 660 mmPa · s). Used in the pasting. This adhesive has a property that the blending viscosity is 1000 mmPa · s at 60 ° C. and 430 mmPa · s at 80 ° C., and the viscosity decreases as the temperature increases.
[0014]
[Comparative Example 1]
Using the conventional solventless laminator (tension control, no second laminating part) shown in FIG. 5, the adhesive and the film to be laminated were set to the same conditions as in the example. The roll temperature in the laminate part 36 was set to 80 ° C.
[Comparative Example 2]
Lamination was performed under the same conditions as in Comparative Example 1 except that the roll temperature in the laminating section 36 was 20 ° C.
[Table 1]

[0015]
【The invention's effect】
As described above, according to the present invention, when a film is bonded with a solventless adhesive, foaming and satin are suppressed in the first laminate portion, and damage to the film is suppressed by the tension control portion and the second minate portion. By suppressing and preventing tunneling, the laminate film without foaming and satin has been produced as a laminated film for packaging with a film combination that has been conventionally difficult to produce due to appearance defects. Manufacture under stable processing conditions without damage and tunneling is now possible.
[Brief description of the drawings]
FIG. 1 is a schematic configuration diagram of a solventless dry laminator used in the practice of the present invention.
2 is a view showing a configuration around a coating portion in the laminator of FIG. 1. FIG.
FIG. 3 is a configuration diagram of a laminate film produced by the method of the present invention.
FIG. 4 is a schematic configuration diagram of a conventional solvent-type dry laminator.
FIG. 5 is a schematic configuration diagram of a conventional solventless dry laminator. FIG. 6 is a configuration diagram of a laminate film manufactured by a conventional dry lamination method.
[Explanation of symbols]
DL Laminating part DL1 First laminating part DL2 Second laminating part G Guide roll TC Tension control part SR Feeding roll unit UW Unwinder RW Rewinder VM Deposition layer 1 Laminating film 2 First substrate 2e Polyester film 2op Biaxially stretched polypropylene film 3 First 2 Substrate 4 Adhesive 10 Solventless dry laminating apparatus 11 of the present invention 1st substrate 12 2nd substrate 13 Laminate film 14 Adhesive (adhesive storage part)
DESCRIPTION OF SYMBOLS 15 Coating part 15a Backup roll 15b Coating roll 15c Metering roll 15d Application roll 16a, 17a Pressure rubber roll 16b, 17b Heating metal roll 18 Mixing supply part 19 Adhesive supply part 20 Solvent type dry laminating apparatus 21 1st base material 22 1st 2 base material 23 laminate film 24 solvent type adhesive (adhesive storage part)
25 Coating part 25a Pressurized rubber roll 25b Heated metal roll 26 Drying zone 27a Rubber roll 27b Heated metal roll 28 Cooling roll 30 Conventional solvent-free dry laminating apparatus 31 First substrate 32 Second substrate 33 Laminating film 34 Solvent-free adhesion Agent (adhesive reservoir)
35 coating part 35a backup roll 35b coating roll 35c metering roll

Claims (3)

In the production of a laminate film processed with a solventless adhesive, after the adhesive is applied to a polyester film as a base film , a polyester film as a base film and an aluminum vapor-deposited polypropylene film as a bonding film are used. A first laminating unit for crimping, a second laminating unit for crimping a laminating film again immediately thereafter, and a laminating apparatus that can freely control the tension between the first laminating unit and the second laminating unit, and performing the first laminating unit warming temperature or more and less than 50 ° C. 100 ° C. roller, the temperature of the roller of the second laminate section is set to 20 ° C. less than 0 ℃ lower than the temperature of the rollers of the first laminate portion A method for producing a laminate film, comprising: A method for producing a laminate film, wherein the tension between the first laminate portion and the second laminate portion is adjusted to 0 kgf / m or more and less than 15 kgf / m using the laminating apparatus according to claim 1. . The method for producing a laminate film according to claim 1 or 2, wherein the solventless adhesive is a two-component solventless adhesive of a type in which the viscosity is lowered by heating.

Images