KR100710893B1 - Method for attaching synthetic resin film with hologram images to polypropylene sheet - Google Patents

Abstract

The method for bonding the hologram-formed synthetic resin film to a polypropylene sheet may include oriented polypropylene (OPP), polyethylene terephthalate (PET), polyvinyl chloride (PVC), and the like. Applying an adhesive 12a to a synthetic resin film 2 made of a material and having a hologram 2a, and drying the synthetic resin film 2 to which the adhesive 12a is applied at a predetermined temperature for a predetermined time; Attaching the synthetic resin film (2) to the polypropylene (PP) sheet (1) and laminating the same; aging the laminated polypropylene sheet (1) and the synthetic resin film (2) at a temperature of about 60 ° C. for about 12 hours. And dry curing the adhesive portion, and cutting the laminated sheet 41 of the polypropylene film 1 and the synthetic resin film 2 into a desired shape. The method of adhering the synthetic resin film to the PP sheet according to the present invention solves the problem that it is impossible to adhere the synthetic resin film such as the OPP film to the conventional PP sheet, such as stationery, accessories, etc., which were conventionally used only by the PP sheet alone. By coating the synthetic resin film such as the OPP film with the hologram engraved on various items, it is possible to visually improve the aesthetics and to increase the value of the product.

 Polypropylene, oriented polypropylene, polyethylene terephthalate, polyvinyl chloride, OPP, PET, PVC, polypropylene glycol, diisocyanate, polyol, polyester polyol, Thomson group, adhesive, toluene, acetone, album cover

Description

Method for attaching synthetic resin film with hologram images to polypropylene sheet}

1 is a conceptual view of a method of making a laminated sheet 41 in which a hologram 2a and a picture 1a appear together by attaching a synthetic resin film 2 having a hologram 2a to a polypropylene sheet 1 according to the present invention. It is shown as.

2 is a block diagram of a working process for carrying out the method for bonding the synthetic resin film 2 to the polypropylene sheet 1 according to the present invention.

3 is a schematic perspective view showing in more detail the configuration of the synthetic resin film supply unit 20 and the adhesive coating unit 10 of FIG.

Fig. 4 shows a finished product using a laminated sheet of a stretched polypropylene / polypropylene sheet produced by a method of bonding a hologram-formed synthetic resin film to a polypropylene sheet as a cover for an album.

5 is a working flowchart of a method for bonding a hologram-formed synthetic resin film to a polypropylene sheet according to the present invention.

* Description of the symbols for the main parts of the drawings *

1: PP sheet 1a: picture

2: resin film 2a: hologram image

2b: synthetic resin film roller 10: adhesive coating

11: metal roller 11a: fine groove

12: glue bucket 12a: glue

12b: Squeegee Knife 13: Pressure Roller

14a, 14b: feed roller 20: supply part

30: drying unit 31: drying chamber

32: heater 40: lamination part

41: laminated sheet 42: conveying conveyor

43a: driven roller 43b: driven roller

43c: guide roller 45a: feed roller

45b, 45c: Pressing roller 46: Knife

47: feed roller 48: stacker

50: ripening part 51: ripening room

52: boiler 60: Thomson

61: Thompson 62: Feed roller

63: conveying conveyor 63a, 63b, 64: roller

100: PP sheet feed roller 101: cartridge

102: feed roller 400: note cover

401: fan type PP sheet 420: heart type PP sheet

C: finished product

Prior arts discovered by the inventors in connection with the present invention include Korean Laid-Open Patent Publication No. 1997-0033813 "Hologram-formed packaging heat adhesive film and its manufacturing method".

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for bonding a hologram-formed synthetic resin film to a polypropylene (PP) sheet. In particular, a conventionally oriented polypropylene (OPP) film may be made of paper or paper such as a ban. Adhesion that makes it easy to attach or coat a stretched polypropylene film to a polypropylene sheet by suggesting a new component of the adhesive to solve the problem of being able to adhere to an object but not to a polypropylene (PP) sheet or film. It is about a method.

Polypropylene sheets, which are commonly used as hard covers for high-end notebooks, files, or albums, could print pictures or photographs on them, but it is not advisable to attach or coat stretched polypropylene (OPP) films to protect their surfaces. It was almost impossible. This is because polypropylene itself has properties that do not allow it to stick well with other materials.

Therefore, conventionally, it is only possible to attach a stretched polypropylene film only on paper or a special paper called prohibition, and thus the use range of the stretched polypropylene as a coating paper for laminating is very limited, and polypropylene also has abrasion resistance and weather resistance. It is pointed out that although it has many advantages such as strength and robustness, it is not possible to apply more advanced aesthetics such as attaching a stretched polypropylene film on top of it to add a hologram image and gloss.

In addition, polyethylene terephthalate (PVC) and polyvinyl chloride (PET), which are widely used as coating films, are also difficult to adhere to each other. There was a problem that it is difficult to increase the value of the product.

Films made of synthetic resin, in particular stretched polypropylene films, have high transparency and strength to protect the adhesive surface, and have excellent properties of clearly displaying the images therein. In addition, stretched polypropylene (OPP) films, PET films, and PVC films can print holographic images on their surfaces, so if a hologram is displayed on these films and attached to a polypropylene sheet, it can be used as a hard cover such as a notebook or album. When used, different holographic images can be displayed according to the viewing angle of users, which can cause optical mystery and have a more beautiful aesthetic. In other words, if the OPP film, PVC film or PET film is attached to a polypropylene sheet and applied to hard covers such as notebooks, albums, or other items of stationery, promotional items, and accessories, the commercial value and There is an advantage to increase the publicity effect.

However, conventionally, regardless of the water-based adhesive or the oil-based adhesive, it is not possible to coat a polypropylene sheet with a synthetic resin film such as a stretched polypropylene film regardless of which adhesive is used. There was a downside.

The present invention is a synthetic resin solution consisting of polyol, diisocyanate and phosphoric acid and a solvent such as toluene, a stretched polypropylene (OPP) film, a polyethylene terephthalate (PET) film or a polyvinyl chloride (PVC) film formed with a hologram By attaching to the polypropylene sheet by using an oil-based adhesive made by mixing with, a laminated sheet having not only durability of the existing polypropylene sheet but also transparency, glossiness, and optical specificity of the holographic image such as a stretched polypropylene film. It is an object of the present invention to provide a method for adhering a holographic formed synthetic resin film to a polypropylene sheet.

It is also an object of the present invention to provide an optimum adhesive for bonding the above-described hologram-formed stretched polypropylene film, polyethylene terephthalate film or polyvinyl chloride film to a polypropylene sheet.

In order to achieve the first object, a method of adhering the holographic formed synthetic resin film provided by the present invention to a polypropylene sheet comprises the steps of: applying an adhesive to the holographic formed synthetic resin film; Drying the adhesive-coated synthetic resin film at a predetermined temperature for a predetermined time; Attaching the synthetic resin film to a polypropylene sheet and laminating it; Maturing the laminated sheet of the polypropylene sheet and the synthetic resin film at a temperature higher than room temperature to dry-cure the adhesive portion; And cutting the laminated sheet of the polypropylene sheet and the synthetic resin film into a desired shape.

In order to achieve the second object, the components of the adhesive provided by the present invention comprise 64% by weight of a synthetic resin solution consisting of 33% by weight of polyol, 64% by weight of diisocyanate and 3% of phosphoric acid, and a solvent consisting of 60% by weight of toluene and 40% by weight of acetone. It is characterized by producing by mixing at a ratio of: 36.

Hereinafter, a method of adhering a holographic formed synthetic resin film to a polypropylene sheet with reference to the accompanying drawings will be described in detail.

Fig. 1 conceptualizes a method of attaching a synthetic resin film 2 having a hologram 2a to a polypropylene sheet 1 in accordance with the present invention to make a laminated sheet 41 in which the hologram 2a and the picture 1a appear together. It is.

In general, a hologram refers to a photographic film recorded so that an image of an object can be reproduced as a two-dimensional diffraction image and a three-dimensional stereoscopic image, and a technique of recording such hologram is called holography. As shown in Fig. 1, in order to form the hologram image 2a on a synthetic resin film 2 such as a stretched polypropylene, a hologram master roll in which the hologram is engraved in advance is made, and the roll is used to form a hologram on the synthetic film. You have to go through the work of engraving.

The present invention will be described with emphasis on the technique of attaching the synthetic resin film 2 to the polypropylene sheet 1 in the state of premise using the synthetic resin film 2 having the hologram image 2a formed in advance. .

As shown in FIG. 1, a polypropylene sheet 1 having a synthetic resin film 2 having a hologram image 2a formed thereon, a character 1a, etc. printed on the surface thereof by a method such as UV (ultra-violet) coating, etc. When attached on top, the hologram image (2a) and the picture (1a) are displayed at the same time, so that you can enjoy not only the optical specificity of the hologram, but also the glossiness and feel superiority of the synthetic resin film such as the stretched polypropylene film. The laminated sheet 41 is made to enjoy the firm physical properties of the sheet.

In this case, as the synthetic resin film 2 formed with the hologram, an oriented polypropylene (OPP) film, a polyethylene terephthalate (PET) film, or a polyvinyl chloride (PVC) film is applicable. Hereinafter, a hologram is formed on these films on the premise that the synthetic resin film 2 includes all of an OPP film, a PET film, and a PVC film, and a method of adhering these films to a polypropylene sheet will be described.

2 is a block diagram of a work process for carrying out the method for bonding the synthetic resin film 2 to the polypropylene sheet 1 according to the present invention, Figure 3 is a synthetic resin film supply portion 20 and the adhesive coating portion of FIG. It is a schematic perspective view which shows the structure of (10) in more detail.

The overall working process of the present invention shown in Figure 2 is largely synthetic resin film supply unit 20, adhesive coating unit 10, drying unit 30, lamination unit 40, aging unit 50 and Thompson portion (Thompson portion, 60).

When explaining the configuration and function of each part in order according to the flow of work, first in the synthetic resin film supply unit 20, the synthetic resin film (2) wound on the synthetic resin film supply roll (2b) and the adhesive roller metal roller 11 and It flows in between the pressure rollers 13. At this time, as shown in Fig. 3, the metal roller 11 for applying the adhesive is always partially immersed in the adhesive 12a in the adhesive container 12, so that the metal roller 11 As it rotates, the adhesive 12a on the surface of the metal roller 11 is scraped off and wiped by a squeegee knife, and only a portion of the inside of the fine grooves 11a remains, and the pressure roller 13 and the metal roller 11 remain. ) Is transferred onto the synthetic resin film (2).

At this time, the adhesive used in the adhesive coating unit 10 is not a general oil-based adhesive, but a new compound developed by the present inventors after endeavor, and a polyol-based urethane-based synthetic resin and an oily solvent of 64:36 Mix in proportion and mix. Urethane-based synthetic resin constituting the main component of the adhesive can be made by selecting and mixing each one of a variety of polyols and diisocyanate (diisocyanate) of the polyol, polyether glycol of the polyether type ( polypropylene glycol) or polyester type 3-methyl-1.5-pentanediol, 1.6-hexane diol or 1.6-trimethylol propane. As the isocyanate, toluene diisocyanate or methane diisocyanate can be used.

Urethane-based synthetic resin, which is the main component of the adhesive, is made by mixing 25 to 45% by weight of polyol, 50 to 75% by weight of diisocyanate, and 2 to 5% by weight of phosphoric acid, and only toluene may be used as an oily solvent mixed with the urethane-based resin. A mixture of 50 to 70% by weight of toluene and 30 to 50% by weight of acetone may be used.

In addition, the polyol for making the urethane-based synthetic resin is one of polypropylene glycol, 3-methyl-1.5-pentanediol (3-Methyl-1.5-Pentanediol), 1.6 hexanediol (1.6-Hexane Diol) and trimethylol propane (Trimethylol propane) It may select and use, and may mix and use 2 or more types of polyol among these. Moreover, the said diisocyanate may also select and use only one of toluene diisocyanate or methane diisocyanate, It is also possible to mix and use these.

According to the experiments of the present inventors, the adhesive 12a is composed of 33% by weight of polyol, 64% by weight of diisocyanate and 3% of phosphoric acid, and the solvent component is 60% by weight of toluene and 40% by weight of acetone. It was found to exert the best adhesion effect.

In more detail with respect to the component ratio of the adhesive, for example, polypropylene glycol is selected from the polyol and mixed with the diisocyanate at a ratio of 33:64, respectively, a precipitate of sodium hydroxide is formed, wherein about 3% of phosphoric acid is added well. When stirred, these hard precipitates melt again to form a steaming solution. The solution is mixed with the toluene solvent to create an adhesive. In general, the domestic oil coating industry has a strong tendency to use only toluene as a solvent, but the inventors experimented that when toluene mixed with acetone at a ratio of 60:40, the adhesion was improved.

The components of the adhesive provided in the present invention are summarized as follows.

(1) polyol:

1) polypropylene glycol (polyol of polyester type),

2) It is possible to select one of 3methyl-1.5 pentanediol, 1.6 hexanediol and trimetholol propane (polyether type polyol) or to mix two or more polyols.

(2) diisocyanate:

1) toluene diisocyanate or

2) It is possible to choose one of methane diisocyanate or to mix two

(3) phosphoric acid

(4) solvent:

1) use only toluene or

2) Toluene and acetone can be mixed at 60:40.

Referring to Figure 2 to further explain the adhesive method of the synthetic resin film and the polypropylene sheet of the present invention, the adhesive is applied to the synthetic resin film (2) is guided to the drying unit 30 by the conveying roller (14a) through Dry curing is performed by the heaters 32 to a temperature of about 25 ~ 35 ℃. The reason for the dry curing of the synthetic resin film 2 immediately after applying the adhesive 12a is that the adhesive made of polyol and diisocyanate-based synthetic resin has the property of exhibiting adhesive strength while being dried and cured before being laminated with the polypropylene sheet (1). It is because it needs to dry-cure to some extent.

The synthetic resin film 2 passing through the drying chamber 31 is pulled out by the conveying roller 14b and laminated with the polypropylene sheet 1 by the conveying roller 45a and the conveying conveyor 42. The polypropylene sheet 1, which is the object of the present invention, has a thickness of about 0.6 to 0.8 mm, which is suitable for use as a cover of various clear files, notes, and albums. Since it is impossible to wind in a roll form, it is preferable to feed the cut pieces in the form of a board into the cartridge 101 in order.

The polypropylene sheets 1 mounted in the cartridge 101 are pulled out by the rotation of the polypropylene sheet feed roller 100 and mounted on the conveying conveyor 42 by the rotational force of the conveying rollers 102. The conveying conveyor 42 is preferably composed of a driving roller 43a, a driven roller 43b and a plurality of guide rollers 43c. Of course, by adopting a mechanical configuration other than the conveying conveyor 42 may be carried out the lamination process.

After laminating the polypropylene sheet 1 and the synthetic resin film 2, the laminated state is continuously maintained by the pressing force of the transfer conveyor 42 and the pressure rollers 45b and 45c, and the synthetic resin is retained by the knife 46. After the film 2 is cut off, it is separated from the lamination sheets 41 positioned behind by the rotational force of the feed rollers 47 and stacked on the stacker 48 in turn.

The laminated sheets 41 stacked on the stacker 48 are aged at a temperature of about 60 ° C. in the aging chamber 51 for about 12 hours to completely dry-cure the adhesive at the bonding site. In FIG. 2, reference numeral 52 denotes a boiler for supplying warmth to the aging chamber 50.

Next, the adhesive sheets are completely dry cured laminated sheets can be cut into a desired shape by a Thompson machine (called 'Domusong' in Korean) 61. The Thomson machine is a laser cutting process of plywood and the like, bending and inserting a knife into the space therebetween, and similarly to a press die, the Thomson cuts and cuts an object to a desired shape.

In the configuration of the Thompson part 60, for example, the laminated sheets 41 are supplied to the conveying conveyor 63 one by one by the feed roller 62, and the laminated sheets 41 on the conveying conveyor 63. ) Is entered into the main body of the Thompson machine 61 is cut in a predetermined shape and then discharged. In Fig. 2, reference numerals 63a and 63b denote drive rollers and driven rollers (guide rollers) constituting the transfer conveyor 63.

The laminated sheets discharged by the Thomson machine 61 may be cut into various shapes of shapes such as the desired shape, that is, the cover 400 of the note or album, the hand fan 410, the heart 420, and the like. Insert the inlay using the album cover 400, and finished the spring binding, such as the finished product (C) such as album.

Fig. 4 is a laminated sheet 41 of a stretched polypropylene / polypropylene sheet produced by a method for bonding a hologram-formed synthetic resin film 2, for example, a stretched polypropylene film to a polypropylene sheet 1; ) Shows the finished product (C) using the cover of the album.

5 is a working flowchart of a method for bonding a hologram-formed synthetic resin film to a polypropylene sheet according to the present invention. The workflow of FIG. 5 corresponds to the workflow of FIG. 2, and among the hologram-formed synthetic resin films (ie, OPP film, PET film, and PVC film), the applicability of OPP film is the largest. In FIG. 5, a work flow chart was prepared for the method of bonding the OPP film to the PP sheet.

First, a hologram image is recorded on the synthetic resin film 2, that is, an OPP film (step S1), and an image such as a picture or a character is coated on the polypropylene sheet 1 (step S2). At this time, since the steps S1 and S2 are proceeded separately from each other, the order may be changed. Next, the adhesive is applied on the hologram-formed OPP film (2) (step S3), wherein the component ratio of the adhesive is mixed by mixing the urethane-based synthetic resin and the oil solvent at a ratio of 64:36, respectively, wherein the urethane-based synthetic resin is polyol 25 ~ 45% by weight, 50% to 75% by weight of diisocyanate and 2% to 5% by weight of phosphoric acid are mixed and the oily solvent is used by mixing all of toluene or 50% to 70% by weight of toluene and 30% to 50% by weight of acetone. At this time, the polyol constituting the urethane-based synthetic resin is used polypropylene glycol (PPG) of the polyether type or 3methyl-1.5 pentanediol, 1.6 hexanediol or trimetholol propane of the polyester type.

In order to achieve the optimum adhesive effect, the urethane-based synthetic resin component in the adhesive 12a is 33% by weight of polyol, 64% by weight of diisocyanate and 3% of phosphoric acid, and the solvent component is 60% by weight of toluene and 40% by weight of acetone. It is preferable to make an adhesive by mixing a urethane-based synthetic resin and a solvent component in a ratio of 64:36, respectively.

Subsequently, the OPP film 2 to which the adhesive 12a is applied is dried and cured at a temperature of about 25 to 30 ° C. while passing through the drying chamber 31 (step S4), and then the OPP film 2 having the hologram formed thereon. To the polypropylene sheet (1) (step S5), the laminated sheet 41 is aged for about 12 hours at a temperature of about 60 ℃ aging to completely dry the adhesive (step S6).

Next, the lamination sheets 41 may be cut into a desired shape using a Thomson machine (step S7), and then used for a desired purpose such as an album cover or a note cover (step S8).

The work method shown in FIG. 5 can be equally applied to PET films and PVC films other than OPP films.

The method of bonding the hologram-formed synthetic resin film to a polypropylene sheet solves the problem of difficult to bond a synthetic resin film such as a stretched polypropylene film to a conventional polypropylene sheet, thereby requiring various polypropylene sheets themselves. Products such as stationery, promotional items, and accessories can be decorated with a coating film such as stretched polypropylene, so that the polypropylene sheet is firm, durable and superior in transparency, glossiness, and touch. And there is an advantage that can utilize all of the luxury aesthetics.

In addition, by forming a hologram on a stretched polypropylene (OPP) film, a polyethylene terephthalate (PET) film or a polyvinyl chloride (PVC) film and adhering it to a polypropylene sheet, the optical aesthetics are increased and the user's satisfaction and the final product There is an advantage to further increase the commercial value.

Claims (13)

delete Forming a hologram 2a on a film 2 made of oriented polypropylene; To the stretched polypropylene film (2) formed with the hologram (2a), 25 to 45% by weight of polypropylene glycol, 50 to 70% by weight of diisocyanate and 2 to 5% by weight of phosphoric acid are mixed Applying an oily adhesive (12a) made by mixing the solution with toluene, wherein the diisocyanate is one of toluene diisocyanate and methane diisocyanate; Drying the stretched polypropylene film 2 having the oily adhesive 12a applied thereto at a temperature of 25 ° C. to 35 ° C. for 10 seconds to 30 seconds; Attaching and stretching the stretched polypropylene film (2) to a polypropylene (PP) sheet (1); Maturing the laminated polypropylene sheet 1 and the stretched polypropylene film 2 at a temperature of 40 to 70 ° C. for 10 to 15 hours to dry-cure the adhesive portion; And Cutting the laminated sheet 41 of the polypropylene sheet 1 and the stretched polypropylene film 2 into a desired shape; adhering the holographic formed synthetic resin film to the polypropylene sheet. How to. delete The synthetic resin of claim 2, wherein the adhesive is prepared by mixing a synthetic resin solution composed of 33% by weight of polypropylene glycol, 64% by weight of diisocyanate, and 3% of phosphoric acid with toluene in a ratio of 64:36. A method of bonding a film to a polypropylene sheet. Forming a hologram 2a on a film 2 made of oriented polypropylene; To a stretched polypropylene film (2) having a hologram (2a), a synthetic resin solution containing 25 to 45% by weight of polyester polyol, 50 to 70% by weight of diisocyanate and 2 to 5% by weight of phosphoric acid was mixed with toluene. As a step of applying a mixed oil-based adhesive (12a), the polyester polyol is 3-methyl-1.5- pentanediol (3-Methyl-1.5-Pentanediol), 1.6 hexanediol (1.6-Hexane Diol) and trimethylol propane (Trimethylol propane), wherein the diisocyanate is one of toluene diisocyanate and methane diisocyanate; Drying the stretched polypropylene film 2 having the oily adhesive 12a applied thereto at a temperature of 25 ° C. to 35 ° C. for 10 seconds to 30 seconds; Attaching and stretching the stretched polypropylene film (2) to a polypropylene (PP) sheet (1); Maturing the laminated polypropylene sheet 1 and the stretched polypropylene film 2 at a temperature of 40 to 70 ° C. for 10 to 15 hours to dry-cure the adhesive portion; And Cutting the laminated sheet 41 of the polypropylene sheet 1 and the stretched polypropylene film 2 into a desired shape; adhering the holographic formed synthetic resin film to the polypropylene sheet. How to. delete delete The method of claim 5, wherein the adhesive is made of a synthetic resin solution made of a hologram-formed synthetic resin, characterized in that the synthetic resin solution consisting of 33% by weight of polyester polyol, 64% by weight of diisocyanate and 3% of phosphoric acid is mixed with toluene in a ratio of 64:36. A method of bonding a film to a polypropylene sheet. Forming a hologram 2a on a film 2 made of oriented polypropylene; To the stretched polypropylene film 2 having the hologram 2a, a synthetic resin solution containing 25 to 45% by weight of polypropylene glycol, 50 to 70% by weight of diisocyanate and 2 to 5% by weight of phosphoric acid was mixed with 50 to 70% by weight of toluene. And applying an oily adhesive 12a prepared by mixing 30-50 wt% of acetone with the solution, wherein the diisocyanate is one of toluene diisocyanate and methane diisocyanate. , step; Drying the stretched polypropylene film 2 having the oily adhesive 12a applied thereto at a temperature of 25 ° C. to 35 ° C. for 10 seconds to 30 seconds; Attaching and stretching the stretched polypropylene film (2) to a polypropylene (PP) sheet (1); Maturing the laminated polypropylene sheet 1 and the stretched polypropylene film 2 at a temperature of 40 to 70 ° C. for 10 to 15 hours to dry-cure the adhesive portion; And Cutting the laminated sheet 41 of the polypropylene sheet 1 and the stretched polypropylene film 2 into a desired shape. How to. The method of claim 9, wherein the adhesive is prepared by mixing a synthetic resin solution composed of 33% by weight of polypropylene glycol, 64% by weight of diisocyanate and 3% of phosphoric acid with a solvent of 60% by weight of toluene and 40% by weight of acetone in a ratio of 64:36. A method of adhering a hologram-formed synthetic resin film to a polypropylene sheet, characterized in that delete delete delete

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