JP2004306977A - Paper container blank, and paper container manufactured by using the blank - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a blank for a paper container having a printed layer or an over-print varnish layer of excellent friction resistance in which the printed layer or the over-print varnish layer is not ground off is, and a paper container manufactured by using the blank. <P>SOLUTION: In the paper container blank (B) consisting of a composite sheet (10) with a base material formed of a paper having a sealant layer (11) of a thermoplastic resin layer on an innermost surface and a printed layer or an over-print varnish layer (12) on an outermost surface, an ink removal preventive varnish layer (13) is formed on the printed layer or the over-print varnish layer (12). <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

【００３５】
このように、フィードされる一番下に位置する紙容器ブランク（Ｂ１）のトップ部分には積み重ねたブランクの荷重がかかり擦れるが、その上に位置する紙容器ブランク（Ｂ２）の印刷面にインキ取られの現象は発生せず不良品は生じなかった（実施例１、実施例２）。
【００３６】
【発明の効果】
トップフィード機の改造、あるいはボトムフィード機の新設等を行う必要がないので、大幅なコストアップを回避できる。
それと比較してインキ取られ防止ニスをパターンコートする本発明は、印刷機に付随するコータ部分で１色としてオーバープリントニスの後工程で容易に塗布することができ、安いコストで実施可能である。
【図面の簡単な説明】
【図１】本発明の紙容器ブランクの一実施例を示す、断面説明図である。
【図２】本発明の紙容器ブランクの一実施例を示す、平面説明図である。
【図３】本発明の紙容器ブランクをシーラント層を上にして複数枚積み重ね、下から一枚ずつフィードしていく状態を横方向から見た説明図である。
【図４】従来の紙容器ブランクをシーラント層を上にして複数枚積み重ね、下から一枚ずつフィードしていく状態を横方向から見た説明図である。
【符号の説明】
１０‥‥複合シート
１１‥‥シーラント層
１２‥‥印刷層又はオーバープリントニス層
１３‥‥インキ取られ防止ニス層
２１‥‥第１パネル
２２‥‥第２パネル
２３‥‥第３パネル
２４‥‥第４パネル
２５‥‥糊代片
ａ‥‥折り曲げ線
Ｂ‥‥ブランク
Ｂ１‥‥一番下に位置するブランク
Ｂ２‥‥一番下から二番目に位置するブランク[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a paper container blank and a paper container manufactured using the blank, and more particularly to a paper container blank and a paper container blank having improved friction resistance of a printing layer or an overprint varnish layer. The present invention relates to a paper container manufactured by the above method.
[0002]
[Prior art]
At least one inner layer and the other edge of a composite sheet based on paper on which a sealant layer made of a thermoplastic resin is formed on at least the innermost surface and a printed layer or an overprint varnish layer is formed on the outermost surface. In the step of joining the outer layer with the outer layer, for example, by means of heat fusion such as using a frame sealer to form a tube, as shown in FIG. 4, first, a plurality of sheets stacked with the sealant layer on the upper side Feed the paper container blanks one by one from the bottom.
[0003]
At this time, when the printing layer or the overprint varnish layer is applied to the leading end portion, the sealant layer (11) of the lowermost blank (B1) which comes out at the time of feeding due to the load of the stacked blanks. ) And the printing layer or the overprint varnish layer (12) of the blank (B2) positioned thereon are partially and very strongly rubbed, so that the sealant layer (B1) of the lowermost blank (B1) is rubbed. In 11), there is a high possibility that "printing defect" occurs in which the printing layer or the overprint varnish layer (12) of the blank (B2) located thereon is scraped off.
[0004]
Particularly, the resin constituting the sealant layer is a low-density polyethylene (density: 0.93 or less) having a low-temperature sealing property and a contaminant sealing property in a filling machine. In some cases, since the slipperiness of the sealant layer is poor, “poor ink removal” tends to occur.
[0005]
[Problems to be solved by the invention]
In the present invention, a sealant layer made of a thermoplastic resin is formed on at least the innermost surface, and a printing layer or an overprint varnish layer is formed on the outermost surface, a paper-based composite sheet, with the sealant layer facing upward. In order to solve the above-mentioned problems that occur when feeding a plurality of stacked paper container blanks one by one from the bottom, the printing layer or the overprint varnish layer is scraped off. An object of the present invention is to provide a blank for a paper container having a printing layer or an overprint varnish layer, which is excellent in abrasion resistance, and a paper container produced using the blank for a paper container.
[0006]
[Means for Solving the Problems]
The invention of claim 1 of the present invention comprises a composite sheet based on a paper having a sealant layer made of a thermoplastic resin formed on at least the innermost surface and a printed layer or an overprint varnish layer formed on the outermost surface. A paper container blank according to any one of claims 1 to 3, characterized in that an ink removal prevention varnish layer is formed on the printing layer or the overprint varnish layer.
[0007]
As described above, according to the first aspect of the present invention, since the ink-preventing varnish layer is formed on the printing layer or overprint varnish layer of the paper container blank, a plurality of sheets are stacked with the sealant layer facing upward. Even if the paper container blanks are fed one by one from the bottom, the printed layer or overprint varnish layer of the upper paper container blank is not removed by the sealant layer of the lower paper container blank.
[0008]
According to a second aspect of the present invention, in the first aspect of the present invention, the ink removal prevention varnish layer is formed on an edge of the paper container blank and in the vicinity thereof. Is a paper container blank.
[0009]
According to a third aspect of the present invention, in the first or second aspect of the invention, the ink removal prevention varnish layer is used to feed a plurality of paper container blanks stacked one on top of the other with a sealant layer facing upward. A paper container blank, characterized in that it is formed on a printing layer or an overprint varnish layer (of the upper paper container blank) which is in contact with the sealant layer (of the lower paper container blank) is there.
[0010]
Thus, according to the invention of claim 2 or 3, the ink removal preventing varnish layer is provided on the edge of the paper container blank and in the vicinity thereof, more specifically, a plurality of paper sheets stacked with the sealant layer facing upward. When the container blanks are fed one by one from below, they are formed on the printing layer (of the upper paper container blank) or the overprint varnish layer that comes into contact with the sealant layer (of the lower paper container blank). Therefore, even if the stacked paper container blanks are fed one by one from the bottom, the printed layer or the overprint varnish layer is not rubbed by the sealant layer and is not removed.
[0011]
A fourth aspect of the present invention is the paper container blank according to the first, second, or third aspect, wherein the ink removal preventing varnish layer is formed by a pattern coating method.
[0012]
As described above, according to the invention described in claim 4, the ink removal preventing varnish layer is formed on the printing layer or the overprint varnish layer by the pattern coating method. However, the physical properties of the overprint varnish layer, such as heat resistance, slip properties, water resistance, and friction resistance, are not impaired.
[0013]
According to a fifth aspect of the present invention, in the first, second, third or fourth aspect of the present invention, the ink removal preventing varnish constituting the ink removal preventing varnish layer has a slipperiness improvement for improving a slipperiness. It is a paper container blank characterized by adding an agent.
[0014]
As described above, according to the fifth aspect of the present invention, since the ink removal preventing varnish constituting the ink removal preventing varnish layer is added with the slipperiness improver for improving the slipperiness, the friction resistance is improved. Because of good properties and slipperiness, it is possible to prevent ink removal due to rubbing with the sealant layer in the pattern-coated portion.
[0015]
According to a sixth aspect of the present invention, there is provided a paper container manufactured using the paper container blank according to any one of the first to fifth aspects.
[0016]
BEST MODE FOR CARRYING OUT THE INVENTION
The paper container blank of the present invention will be described in detail below based on one embodiment.
In the paper container blank of the present invention, for example, as shown in FIG. 1, a sealant layer (11) made of a thermoplastic resin is formed on at least the innermost surface, and a printing layer or an overprint varnish layer (12) is formed on the outermost surface. A paper container blank (B) comprising a composite sheet (10) based on coated paper, wherein an ink removal prevention varnish layer (13) is provided on the printing layer or overprint varnish layer (12). Is formed.
[0017]
As the sealant layer (11), polyolefin resins such as polyethylene and polypropylene can be used, and among them, a linear low-density polyethylene resin (L-LDPE) resin produced using a metallocene catalyst can be preferably used.
[0018]
As an example of a composite sheet (10) based on paper, for example, [inside of container] low-density polyethylene (LDPE) / paper / LDPE / uniaxially or biaxially stretched polyester film, polyamide film, polyolefin film L-LDPE [outside of container] produced using an inorganic compound vapor-deposited plastic film / metallocene catalyst in which a thin film of an inorganic compound such as aluminum oxide or silicon oxide is provided on a stretched film having a thickness of about 20 to 100 nm. A composite sheet having such a layer configuration corresponds to the composite sheet.
[0019]
The printing layer or the overprint varnish layer (12) is not particularly limited, but when an offset printing method is employed, an ultraviolet-curable ink or an overprint varnish can be preferably used from the viewpoint of workability and resistance.
In addition, a method of applying an overprint varnish layer on a printing layer is generally used.
[0020]
When the ink removal prevention varnish layer (13) employs an ultraviolet-curing type varnish as a printing layer or an overprint varnish layer (12), for example, a silicone resin is added to an ultraviolet-curing varnish mainly composed of a polyester resin. (Addition amount: 0.0001 to 20%) and apply it to a required portion on a printing layer or an overprint varnish layer (12) by an offset printing method. A wax may be added instead of the silicone resin (addition amount: 0.0001 to 20%).
Note that a varnish having excellent slipperiness and friction resistance, such as a hard resin type, may be used.
[0021]
For example, when a resin of a hard type to which silicon is added, such as “No. 7 UV HKR OP Varnish UP-1 (manufactured by T & K TOKA)” for offset printing, is used, the friction resistance and slipperiness are good. In addition, it is possible to prevent ink removal due to rubbing with the sealant layer in the pattern-coated portion.
[0022]
The application location is preferably a location where a plurality of paper container blanks are stacked with the sealant layer (11) facing upward and when they are fed one by one from below, they come into strong contact with the sealant layer of the paper container blank located below. (See FIGS. 2 and 3).
[0023]
In addition, a paper container made from such a paper container blank has no ink removed on its surface, so that a paper container with a beautiful appearance can be produced.
[0024]
【Example】
Hereinafter, the present invention will be described in detail with reference to examples.
<Example 1>
As a paper-based composite sheet (10), [inside of the container] an inorganic compound vapor-deposited plastic in which a silicon oxide thin film is provided to a thickness of about 60 nm on LDPE / paper / LDPE / biaxially stretched polyester film. A composite sheet having a layer structure composed of film / L-LDPE (without adding a slip agent) [outside the container] manufactured using a metallocene catalyst was prepared.
[0025]
From this composite sheet (10), a flat-top type liquid paper container blank (B) having a flat side with a side of 65 mm and a capacity of 400 ml was produced (see FIG. 2).
[0026]
On the surface of the blank (B), the first panel (21), the second panel (22), the third panel (23), the fourth panel (23) are removed in advance in the stage of the composite sheet, except for the glue margin (25). In both the panels (24), a printing layer and an overprint varnish layer (12) are formed on almost the entire surface except for the bottom portion.
[0027]
In addition, each bending line (a) at the boundary between the first panel (21) and the second panel (22) on the top side and the boundary between the fourth panel (24) and the adhesive margin (25) is 3 mm in front and rear, Over the depth of 7 mm, the following ink removal prevention varnish is printed by an offset printing method on the overprint varnish layer (12) so as to have a film thickness of about 1 μm, whereby the ink removal prevention varnish layer (13) is formed. ing.
[0028]
The used ink removing varnish is No. 7 UV HKR OP Varnish UP-1 (manufactured by T & K TOKA CORPORATION).
[0029]
A plurality of the blanks (B) are stacked with the sealant layer (11) facing upward, fed one by one from the top side, and passed through a frame sealer to heat one inner edge layer and the other outer edge layer of the blank. A tubular sleeve was produced by heat fusion by a fusion method.
[0030]
At this time, skive hemming processing is performed in which half of the front side of the edge of the glue margin piece (25) is deleted (skived), and the rest of the shaved portion is folded back (hemmed) so that the deleted surface is on the inside. The folded portion and the adjacent non-skived portion have the same height, which is desirable for bonding to the inner surface of the edge of the other (first panel (21)).
[0031]
<Example 2>
Except that the varnish for preventing ink removal was based on “No. 7 UV HKR OP varnish UP-1” and the varnish to which wax was added instead of silicon was used (the film thickness was 1 μm as in Example 1). Using the same material, method and apparatus as in Example 1, a cylindrical sleeve was fused from a blank of the same size.
[0032]
<Comparative Example 1>
A cylindrical sleeve was fused from a blank of the same size using the same material, method and apparatus as in Example 1 except that the ink removal preventing varnish layer was not provided.
[0033]
The slip properties (slip angle), rub resistance, and ink removal of the blanks and sleeves thus obtained were checked and measured by the following methods. Table 1 shows the results.
Slip property (slip angle) 摩擦 Friction resistance according to JIS P8147 (Test method for friction coefficient of paper and paperboard) ３００ Apply 500 g load to the varnish surface and sealant surface for preventing ink removal using a gakushin friction tester. times rubbing, at the time of the welding process the blank into a cylindrical shape of Sri over blanking using a ‥ frame sealer taken visually evaluated ink the scratch of the incoming condition, visual observation of the degree of taken of ink [0034]
[Table 1]

[0035]
In this way, the load of the stacked blanks is rubbed on the top portion of the lowermost paper container blank (B1) to be fed, but the printing surface of the paper container blank (B2) positioned thereon is rubbed. No removal phenomenon occurred, and no defective products occurred (Examples 1 and 2).
[0036]
【The invention's effect】
It is not necessary to modify the top feed machine or newly install the bottom feed machine, so that a significant increase in cost can be avoided.
In contrast, the present invention of pattern-coating the ink removal prevention varnish can be easily applied in a post-process of the overprint varnish as one color in a coater portion associated with a printing press, and can be implemented at low cost. .
[Brief description of the drawings]
FIG. 1 is an explanatory sectional view showing an embodiment of a paper container blank of the present invention.
FIG. 2 is an explanatory plan view showing an embodiment of the paper container blank of the present invention.
FIG. 3 is an explanatory view of a state in which a plurality of paper container blanks of the present invention are stacked with the sealant layer facing upward and fed one by one from below as viewed from the lateral direction.
FIG. 4 is an explanatory view of a state in which a plurality of conventional paper container blanks are stacked with a sealant layer on top and fed one by one from below as viewed from the lateral direction.
[Explanation of symbols]
10 Composite sheet 11 Sealant layer 12 Printing layer or overprint varnish layer 13 Ink removal prevention varnish layer 21 First panel 22 Second panel 23 Third panel 24 4th panel 25 {glue piece a} bending line B {blank B1} blank B2 located at the bottom {blank located second from the bottom}

Claims (6)

A sealant layer made of a thermoplastic resin is formed on at least the innermost surface, and a paper container blank composed of a composite sheet based on paper on which a printed layer or an overprint varnish layer is formed on the outermost surface,
A paper container blank, wherein an ink removal preventing varnish layer is formed on the printing layer or the overprint varnish layer. The paper container blank according to claim 1, wherein the ink removal prevention varnish layer is formed at an edge of the paper container blank and in the vicinity thereof. The ink removal prevention varnish layer comes into contact with the sealant layer (of the lower paper container blank) when a plurality of paper container blanks stacked one on top of the other are fed one by one from below. 3. A paper container blank according to claim 1, wherein the paper container blank is formed on a printing layer or an overprint varnish layer). 4. The paper container blank according to claim 1, wherein the ink removal prevention varnish layer is formed by a pattern coating method. 5. The ink removal prevention varnish constituting the ink removal prevention varnish layer, wherein a slipperiness improver for improving slipperiness is added. Paper container blank. A paper container manufactured using the paper container blank according to claim 1.

Images