JP6946798B2 - How to process carton base material - Google Patents

Description

The present invention relates to a method for processing a carton base material (concavo-convex forming method) in which irregularities are formed on a resin layer on the surface to give a matte feeling.

The carton base material used for paper containers is subjected to surface processing (exterior) according to various purposes.

In addition to the product description (product name, contents, manufacturer), on the printing layer to realize the eye-catching effect and the improvement of decorativeness, protection of the printing layer, gas barrier property, water resistance, chemical resistance, In addition to light resistance and mechanical strength, mirror processing and embossing are added as necessary after laminating a resin layer (film) for the purpose of giving further decorativeness (glossiness, matte feeling). NS.

When the film laminating method is used for the surface gloss finish, the physical properties such as wear resistance as well as the design are excellent, but there is a problem in terms of price. When the method of applying gloss varnish to the surface is adopted, the price is high. In terms of aspects, although superiority is recognized, there is a problem that wear resistance is inferior.

Press coat processing is promising as a method that considers the balance between cost and physical properties.
Press coat processing is a method in which after applying varnish to the base material, the varnish is heated and softened, and the surface presses a mirror-finished ferroplate to give a glossy finish. It has been removed and is widely used, but for example, in order to heat it to a high temperature of about 160 ° C and press it, we try to use aluminum foil paper laminated with aluminum foil or aluminum vapor-deposited paper laminated with aluminum-deposited film as a base material. In some cases, it has been said that it cannot be used due to cracking.

On the other hand, in order to give a matte feeling (matte feeling) to the carton base material for the purpose of preventing blocking when printing the front and back sides, there is also a demand for surface processing to form fine irregularities, and a matte coating agent was added. Although a matte coat layer is also provided, chloride added with a silica-based matte coat agent suitable for imparting heat resistance and writing suitability so that the matte coat layer is not transferred to the heat seal bar side in the heat seal step. A proposal relating to the application of a method for forming a matte coat layer (XEL written OP varnish) made of a vinyl / vinyl acetate copolymer resin / acrylic polyol mixed resin to a food packaging material is also known. (See Patent Document 1)
Hereinafter, in the present specification, the matte coat layer to which the silica-based matte coat agent is added is referred to as matt vinyl.

Since the matte vinyl treatment (processing) is performed by varnishing (printing), uniform (solid) unevenness is formed on the entire surface of the printed portion.

There is also a demand for further decorative processing on the matte vinyl surface by forming local and selective unevenness on the matte vinyl, such as by synchronizing with the printing layer of the matte vinyl lower layer formed on the carton base material. When forming a pattern or pattern consisting of unevenness that exceeds the unevenness of size and depth depending on the grain system of the agent on the carton base material, after forming the matte vinyl, pressing processing using a stamper having the desired uneven pattern on the surface. (Embossing) is required.

As a matter of course, the preparation of stampers and the addition of post-processing are accompanied by cost increase and process increase.

Utility Model Registration No. 2537795

The present invention does not require the addition of a pressing process (embossing) using a stamper, and additionally forms a local and selective uneven pattern different from the solid unevenness on the entire surface of the matte vinyl surface, and forms a carton base material. The purpose is to propose a method that can easily add decorativeness, design, eye-catching effect, and security.

The method for processing a carton base material according to the present invention, which was made for the purpose of solving the above problems, is
A carton base material having a thermoplastic resin layer which is a matte coat layer made of a vinyl chloride / vinyl acetate copolymer resin / acrylic polyol mixed resin to which a matte coating agent is added, which is formed by coating on the surface of a paperboard via a metallic glossy layer. A thermoplastic resin that selectively controls the irradiation amount of hot air or infrared rays between the heating source that generates at least one of hot air and infrared rays and the carton base material when the heat is transferred into the oven unit and heated. The layer is characterized by comprising a step of heating the carton substrate in a non-contact arrangement.
In the above processing method, it is preferable that the member that selectively controls the irradiation amount of hot air or infrared rays has a grid-like mesh made of glass fiber.

In the oven unit, an uneven pattern may be additionally formed by performing heat treatment in a state where the conveyed carton base material is stationary.

If heat treatment is selected in which the carton substrate is transported in the oven unit without resting, the member that selectively controls the irradiation amount of hot air or infrared rays moves in synchronization with the transport of the carton substrate. A processing method may be adopted.

According to the present invention, it is not necessary to add a pressing process (embossing) using a stamper, and a local / selective uneven pattern different from the solid unevenness on the entire surface of the matte vinyl surface is additionally formed to form a carton base material. It is possible to easily add decorativeness, design, eye-catching effect, and security, and secure an advantage in terms of cost.

Explanatory drawing which shows the structural example of the carton base material by this invention. Explanatory drawing which shows the processing method of the carton base material by this invention.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

The present invention is not limited to the configurations shown and explained in the embodiments, and appropriate modifications can be made without departing from the gist.

The carton base material to be decorated in the present invention has a structure in which at least a metallic gloss layer and a thermoplastic resin layer (matt vinyl layer) are laminated on the surface of the paperboard, and in the example shown in FIG. 1 (a). From the lower side of the figure, the layer structure is composed of paperboard / metal gloss layer (aluminum foil, aluminum vapor deposition film) / matt vinyl layer.
The matte vinyl layer is coated with a matte coat layer (varnish) made of a vinyl chloride / vinyl acetate copolymer resin / acrylic polyol mixed resin to which a silica-based matte coating agent is added.

In the example shown in FIG. 1B, from the lower side of the figure, the layer structure is composed of a paperboard / metallic luster layer (sheet base material coated with gold ink or silver ink) / printing layer / matt vinyl layer.
In addition to the product description (product name, contents, manufacturer), the print layer has a printed pattern for achieving an eye-catching effect and improved decorativeness directly on the glossy layer or any layer (print target). It is formed through (printed on the surface of a sheet of paper, resin, etc.).
The matte vinyl layer has the same structure as that shown in FIG. 1 (a).

In the embodiments of FIGS. 1A and 1B, the forms of the metal foil, the metal vapor deposition layer, and the metallic ink layer are not selected depending on the presence or absence of the print layer, and the metallic luster layer is a matte vinyl layer. It is effective in improving the visibility of the additionally formed uneven pattern, and its form is appropriately selected.

In addition, the print layer is not an indispensable configuration, but may be provided on a paperboard, depending on the purpose of the exterior / interior of the final product and the necessity of display.

In the present invention, the surface of the matte vinyl layer (the addition of the matte coating agent forms uniform fine irregularities on the entire surface of the coated surface) in FIG. 1 is locally and selectively selected from the fine irregularities. The main feature is to form an uneven (embossed) pattern with a large size and depth, and the matte vinyl layer is formed (varnished) regardless of the pressure molding using a stamper in another process after the matte vinyl layer is formed. It is peculiar to the present invention that the uneven (embossed) pattern is formed at the same time during the subsequent drying process.
When the matte vinyl layer (varnish) is applied and formed on the carton base material in the state before the formation of the matte vinyl layer, it may be applied using a normal printing machine or a coating machine, and the forming method is limited. is not it.
When forming the matte vinyl layer through the anchor layer, there is an advantage that the adhesion strength of the matte vinyl layer to the carton base material is improved and the matte vinyl layer can be formed evenly on the entire surface, but the formation of the anchor layer is indispensable. No. The anchor layer is selected in consideration of adhesion to paperboard and matt vinyl layer, chemical reaction based on composition, coating suitability, and the like.
Next, the carton base material on which the matte vinyl layer is applied and formed is conveyed into the oven unit, and the matte vinyl layer is dried.
When the matte vinyl layer is heated in the oven unit, a member that selectively controls the irradiation amount of hot air or infrared rays between the heating source that generates at least one of hot air and infrared rays and the carton base material is a thermoplastic resin. The carton substrate is heated in a non-contact manner with the layers.
As a member for selectively controlling the irradiation amount of hot air or infrared rays, a sheet-like member having a grid-like mesh made of glass fiber is adopted.
FIG. 2 is an explanatory view showing an outline of a method for processing a carton base material according to the present invention, and shows a process of heating and drying the carton base material in an oven unit.
The matte vinyl layer is heated and dried by at least one of hot air and infrared rays emitted from the heating source 11 with respect to the carton base material 1 conveyed in the oven unit 10.
A sheet-like member 12 that selectively controls the irradiation amount of hot air or infrared rays is arranged between the heating source 11 and the carton base material 1, and the amount of hot air or infrared rays irradiated to the surface of the matte vinyl layer can be adjusted. Modulation is applied according to the opening pattern 13 formed in the sheet-shaped member 12.

On the surface of the matte vinyl layer, the matte vinyl layer, which is undried and has an appropriate thickness and viscosity, is irradiated with hot air or infrared rays that have passed through the member with an irradiation amount distribution according to the opening pattern of the mesh. By microscopically causing a difference in the start time and degree of drying shrinkage locally, in the oven unit without applying the special heating and pressurizing conditions that were applied in the conventional embossing process (separate process). At the same time as the drying process of the above, the uneven shape corresponding to the opening pattern of the mesh is transferred to the matte vinyl layer.

It is also possible to change the uneven shape formed on the matte vinyl layer by changing the opening pattern of the mesh of the member that selectively controls the irradiation amount of hot air or infrared rays, and further, the member is intentionally used. By forming openings with various patterns, it is possible to form patterns, character patterns, etc. that are not just irregularities.

In the oven unit, ensuring that the carton base material and the opening pattern do not move relatively during heating and drying is effective for the faithful transition of the opening pattern, and the carton base material is stationary under the heating source. It is preferable that an uneven pattern is formed with drying in this state. When the carton base material is heated while being transported without being intermittently stationary in the oven unit, the member that selectively controls the irradiation amount of hot air or infrared rays moves in synchronization with the conveyor transport of the carton base material. It is desirable to adopt a device configuration to be used.

● Paperboard: Brilliant SB (made by Keio Paper; 12 μm thickness, 310 g / m ² )
● Matte vinyl: BM852 (made by Daiichi Paint)
The matte vinyl was applied and formed on one surface of the paperboard, dried (and embossed) in the oven unit, and then a carton manufacturing process of punching-musiri-pasting was performed.
● Oven conditions: 100 ° C, transport speed = 55 m / min

<Comparative example 1>
● Paperboard: Brilliant SB (made by Keio Paper; 12 μm thickness, 310 g / m ² )
● Matte vinyl: Fine coat 504 (manufactured by Tokyo Ink; no matte coating agent added)
The matte vinyl was applied and formed on one surface of the paperboard, dried (and embossed) in the oven unit, and then a carton manufacturing process of punching-musiri-pasting was performed.
● Oven conditions: 100 ° C, transport speed = 55 m / min

<Comparative example 2>
The manufacturing process was carried out in the same manner as in Example 1 except that the oven conditions were as follows.
● Oven conditions: 80 ° C, transport speed = 45 m / min
The evaluation results of Examples and Comparative Examples are shown in Table 1 below.

Only in the examples, the surface shape of the transport roller in the oven unit was transferred to the matte vinyl surface, which contributed to the improvement of the decorative effect and the design effect.

1 Carton base material 10 Oven unit 11 Heating source 12 Member that selectively controls the irradiation amount of hot air or infrared rays 13 Aperture pattern

Claims (4)

A method for processing a carton base material in which the surface of the thermoplastic resin layer of the carton base material having at least a thermoplastic resin layer laminated on the surface of the paperboard is matted.
A carton base material having a thermoplastic resin layer which is a matte coat layer made of a vinyl chloride / vinyl acetate copolymer resin / acrylic polyol mixed resin to which a matte coating agent is added, which is formed by coating on the surface of a paperboard via a metallic glossy layer. A thermoplastic resin that selectively controls the irradiation amount of hot air or infrared rays between the heating source that generates at least one of hot air and infrared rays and the carton base material when the heat is transferred into the oven unit and heated. A method for processing a carton base material, wherein the layer is provided with a step of heating the carton base material in a state of being arranged in a non-contact manner. The method for processing a carton base material according to claim 1, wherein the member that selectively controls the irradiation amount of hot air or infrared rays has a grid-like mesh made of glass fiber. The method for processing a carton base material according to claim 1 or 2, wherein the member that selectively controls the irradiation amount of hot air or infrared rays moves in synchronization with the transportation of the carton base material. The method for processing a carton base material according to any one of claims 1 to 3, wherein at least one of a printing layer and a resin layer is interposed between the metallic luster layer and the thermoplastic resin layer.

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