JP5824847B2 - wrapping paper - Google Patents

Description

  The present invention relates to a folding wrapping paper for individually packaging caramel, bags and the like. In particular, the present invention relates to a wrapping paper that has a dead hold property and is excellent in disposal processing by removing aluminum foil from the wrapping paper.

  2. Description of the Related Art Conventionally, as a packaging material for individual packaging such as bags, a packaging material that is thin and foldable (dead hold) has been required. Conventionally, as a countermeasure, a packaging material in which an aluminum foil is laminated on thin paper is used to provide a function of dead hold property and satisfy the filling suitability.

  On the other hand, however, when cutting the wrapping paper on the filling line, there is a problem that metal powder is generated and adheres to the contents, and the metal detector cannot be inspected for contamination by the metal detector after filling the contents. In addition, the use of aluminum foil increases the manufacturing cost of the wrapping paper, and there is a problem that the disposal property after use remains at the time of incineration.

  Examples of wrapping paper having a configuration not using aluminum foil (hereinafter referred to as aluminum-less wrapping paper) include cellophane, paper / cellophane, and wax paper impregnated with wax or wax. These wrapping papers eliminate the disadvantages of using aluminum foil, but conversely, the advantages of using aluminum foil are lost.

  In the configuration using cellophane, the manufacturing cost is high as with the wrapping paper using aluminum foil, and the dead hold property when folded at an acute angle is good, but when it is folded at an obtuse angle, the repulsive force is strong. Therefore, it is necessary to adjust the filling equipment. As shown in FIG. 5, even if the cellophane 6 is folded, the cellophane 6 is opened by the repulsive force 7 to return, and the dead hold property is insufficient.

  In addition, since wax paper is impregnated with paper or wax, the wax or wax is excessively attached to the front or back of the paper base, especially when a packaged product is transported on the filling line. , Wax and wax may fall off due to friction, causing contamination. In addition, with regard to dead-holding properties, by placing a heater in the holding jig of the folding line, the wax and wax on the front and back sides are welded, and the packaging suitability is improved by the pseudo adhesive force. However, by using a heater, especially in a soft candy such as caramel, which is easily softened by heating, the contents are welded to the heater, resulting in a decrease in production efficiency and an increase in cost. In addition, the contents become sticky due to heating, and the releasability from the wrapping paper also decreases, and when the consumer eats the contents, there is a problem that a part of the wrapping paper is peeled off and mixed into the contents.

  In any aluminum-less wrapping paper, since static electricity generated during machine conveyance is easily charged, there is a problem that troubles such as clogging, cutting misalignment, and misalignment of the wrapping paper on the filling machine occur.

Moreover, in order to give dead hold property, it is the packaging material which apply | coated 2-8 g / m < ² > of wax to the paper base material, and the average particle diameter of the long side direction of an inorganic filler in this wax is 50 micrometers or less Or there is a proposal in which flakes are dispersed (Patent Document 1).

  However, although there is an effect of improving the dead hold property, there is a problem that the effect cannot be stably obtained due to dispersion of inorganic filler dispersion.

JP 2008-280063 A

  In view of the problem of the background art, the present invention is to provide a wrapping paper that is excellent in dead hold property, peelability from contents, oil resistance, and disposal property without using an aluminum foil. .

  In order to solve the above problems, the inventors have intensively studied and completed the present invention.

The invention according to claim 1 of the present invention is a wrapping paper in which a varnish layer is laminated on the entire surface of a paper substrate and a wax layer is laminated on the entire back surface, and the basis weight of the paper substrate is 25 to 45 g / m ² , The coating amount of the wax layer is 5 to 30 g / m ² , and the coefficient of dynamic friction between the surface of the wax layer and the metal (JIS
Value measured by a K-7125) is, Ri 0.1 to 0.2 der,
The back surface of the paper substrate is embossed with an embossing mold, and the wax layer is laminated on the embossed surface .

The invention according to claim 2 of the present invention, oil resistance of the paper substrate (JAPAN TAPPI No.41: value measured by Kidd method), No placing serial to claim 1, characterized in that at least 5 Wrapping paper.

According to a third aspect of the present invention, there is provided an oil resistance (JAPAN) of a paper base material layer including the varnish layer.
TAPPI No. 41: Value measured by the Kid method) is 5 or more, The wrapping paper according to claim 1 .

The invention according to claim 4 of the present invention is the wrapping paper according to any one of claims 1 to 3 , wherein a softening point of the wax layer is 70 ° C or higher.

The invention according to claim 5 of the present invention is characterized in that an adhesive strength (measured by JIS Z-1707 method) between the paper substrate and the wax layer is 0.1 to 0.4 N / 15 mm. The wrapping paper according to any one of claims 1 to 4 .

According to claim 1 of the present invention, there is provided a wrapping paper in which a varnish layer is laminated on the entire surface of a paper substrate and a wax layer is laminated on the entire back surface, wherein the basis weight of the paper substrate is 25 to 45 g / m ² , The coating amount of the wax layer is 5 to 30 g / m ² , and the coefficient of dynamic friction between the surface of the wax layer and the metal (value measured according to JIS K-7125) is 0.1 to 0.2. And The wrapping paper of the present invention is a wrapping paper in which a varnish layer is laminated on the surface of a paper substrate and a wax layer is laminated on the back surface. This made it possible to use a metal detector, eliminating the metal powder generated during cutting.

In addition, since the wrapping paper is made of aluminum-less, the basis weight of the paper layer is set to 25 to 45 g / in order to eliminate the occurrence of cutting misalignment, filling misalignment, etc. due to the decrease in folding suitability and electrostatic charge generated during transport on the machine. and m ^2. When the basis weight is less than 25 g / m ² , the waist strength is insufficient and folding suitability and shape retention are not good. On the contrary, if the basis weight exceeds 45 g / m ² , the repulsive force at the time of folding is strong, and the folded shape cannot be maintained.

The amount of wax applied is 5 to 30 g / m ² . When the applied amount of the wax is less than 5 g / m ^2, the influence of the fiber of the paper base material is large, and the folding shape holding property, that is, the dead holding property is not improved. Further, the penetration of the wax into the fiber of the paper base material is insufficient, and the ruled line breakage due to the folding line occurs, so that the strength as a wrapping paper is lowered. On the other hand, if it exceeds 30 g / m ² , the repulsive force at the time of folding is stronger than the flexibility of the wax, and shape retention cannot be obtained. Moreover, application of an excessive amount of wax also causes foreign matter contamination due to dropping off of the wax on the filling machine, and also leads to an increase in cost.

  Next, the coefficient of dynamic friction between the wax surface and the metal (measured according to JIS K-7125) is set to 0.1 to 0.2. Usually, aluminum, iron / chromium plating, stainless steel, or the like is used as an apparatus such as a filling machine or a metal such as a guide roll. When the coefficient of dynamic friction with these metals is less than 0.1, excessive slip occurs during filling, and filling deviation occurs. Moreover, since the slipperiness between the paper surfaces of the wrapping paper becomes excessive, there is a problem that winding deviation occurs in winding the wrapping paper. On the other hand, when the dynamic friction coefficient exceeds 0.2, when the wrapping paper is conveyed, static electricity due to friction is charged, and there is a problem that problems in filling occur such as cutting misalignment, filling misalignment, and wrapping paper jam. .

Further, according to claim 1 of the present invention, the back surface of the paper substrate, is embossed by embossing type, characterized in that a laminate of the wax layer on the embossed surface. Embossing the paper substrate reduces the influence of the paper substrate fiber, suppresses the repulsive force of the paper substrate fiber during folding, and improves the dead hold property. In the folding packaging, since the wax layer side is folded with the inner surface side, pressing the embossing die from the inner surface side facilitates inner surface valley folding. In addition, by laminating the wax layer on the surface pressed by the embossing mold, the effect of suppressing repulsion of the paper base fiber by embossing is exhibited.

According to claim 2 of the present invention, in the wrapping paper according to claim 1, oil resistance of the paper base material (JAPAN TAPPI No. 41: a value measured by a kid method) is 5 or more. And The paper base material is an oil resistant paper in which an oil resistant agent is internally added at the stage of paper making. In particular, when the contents are caramel type contents including fats and condensed milk, it is possible to prevent the oil and fat components from exuding. Bleeding can be avoided by laminating a wax layer in addition to a paper substrate having oil resistance. The coated paper coated with an oil resistant agent has a remarkable deterioration in the oil resistance of the ruled line portion, whereas the internally added oil resistant paper is less likely to be bent and is suitable for folding packaging.

According to claim 3 of the present invention, in the wrapping paper according to claim 1, the oil resistance of the paper base material layer including the varnish layer (JAPAN TAPPI No. 41: a value measured by a kid method) is 5 It is the above. Even if the oil resistance of the paper substrate is less than 5, oil resistance can be improved by laminating the varnish layer on the surface of the paper substrate. There may be five or more in total with a varnish layer and a paper base material.

According to claim 4 of the present invention, in the wrapping paper according to any one of claims 1 to 3 , the softening point of the wax layer is 70 ° C. or more. When a wax layer having a melting point of less than 70 ° C. is formed on the back surface of the paper substrate, since the melt viscosity is low, soaking into the paper substrate and a uniform wax layer is not formed. In the case of contents containing a lot of moisture, fats and oils may flow out of the surface of the wrapping paper through the paper base fiber. Therefore, it is necessary that the melting point of the wax is 70 ° C. or higher.

According to claim 5 of the present invention, in the wrapping paper according to any one of claims 1 to 4, the adhesive strength between the paper substrate and the wax layer (value measured by JIS Z-1707 method). Is 0.1 to 0.4 N / 15 mm. Depending on the distribution form such as the outer packaging material, the wrapping paper may be temporarily fixed by heat sealing at the time of filling. In that case, if the adhesive strength is less than 0.1 N / 15 mm, the temporary fixing effect cannot be obtained due to insufficient strength, and if it exceeds 0.4 N / 15 mm, the adhesive strength becomes excessive and the wrapping paper is torn during opening. As a result, openability cannot be obtained.

It is explanatory drawing which shows one reference example of a structure of the wrapping paper of this invention. It is explanatory drawing which shows one reference example of the structure containing the printing layer of the wrapping paper of this invention. It is explanatory drawing which shows an example of the structure which embossed the back surface of the paper base material of the wrapping paper of this invention. It is explanatory drawing which showed an example of the dead hold property of the wrapping paper shown in FIG. It is explanatory drawing which showed an example of the dead hold property of a cellophane.

  Hereinafter, embodiments for carrying out the present invention will be described.

FIG. 1 is an explanatory view showing a reference example of the configuration of the wrapping paper of the present invention. In FIG. 1, a varnish layer 3 is laminated on the entire surface of a paper substrate 1 and a wax layer 4 is laminated on the entire back surface.

FIG. 2 is an explanatory diagram showing a reference example of a configuration including a printing layer made of pattern ink. In FIG. 2, a printed layer 2 made of pattern ink is formed on the surface of a paper substrate 1, a varnish layer 3 is laminated on the entire printed layer, and a wax layer 4 is laminated on the entire rear surface. When the contents are caramel type contents containing fats and oils and condensed milk, the paper base is made of oil-resistant paper, and the varnish layer 3 is provided, so that oil components can be prevented from exuding. .

FIG. 3 is an explanatory view showing an example of a configuration in which the back surface of the paper base material of the wrapping paper of the present invention is embossed. Embossing is performed on the back surface of the paper substrate, and a wax layer 4 is laminated thereon.

  Examples of the substrate used for the paper substrate include fine paper, pure white roll paper, coated paper, glassine paper, mixed paper, and oil-resistant paper, but are not limited thereto.

If any paper has a basis weight in the range of 25 to 45 g / m ² , it cannot be folded into the intended packaging form. If it is too thin, the waist strength is lowered, and there is a concern about collapse during folding. Moreover, when laminating the wax layer 4, there is a concern about seepage from the processed back surface. If it is too thick, the repulsive force from the fibers of the paper layer will increase, and folding will not be performed properly. Preferably, if it is 30-40 g / m < ² >, the balance of a softness | flexibility and intensity | strength will become good.

Next, the wax layer 4 that can be used in the present invention can be defined as follows.
A solid having a melting point of 40 ° C or higher (generally 50 to 160 ° C).
Low melt viscosity (melt viscosity at a temperature 10 ° C. higher than the melting point is 10 Pa · s or less).
-Does not decompose when melted.
・ Gloss is obtained by friction and soot is generated by combustion.
Anything that falls into such a definition can be used.

  Examples of the wax agent that forms the wax layer 4 include natural waxes such as paraffin wax, montan wax, and carnauba wax, semi-synthetic waxes such as amide wax and modified montan wax, and synthetic waxes such as polyethylene wax and ethylene-vinyl acetate wax. These waxes are used as the main component, and those having adhesiveness and fluidity adjusted with paraffin or resin components are used.

Moreover, as resin which forms the varnish layer 3, resin melt | dissolved in an organic solvent, resin dispersible in an aqueous solvent, etc. can be used, for example. For example, polyurethane resin, ethylene-vinyl acetate copolymer resin, vinyl chloride-vinyl acetate copolymer resin, polyvinyl alcohol resin, cellulose resin, chlorinated polyolefin resin, polyester resin, acrylic resin, etc. may be used. it can. In particular, if a resin used as a binder for pattern ink is used, the varnish layer 3 can be formed in-line with pattern printing.

  The present invention will be described in more detail.

A method for producing the wrapping paper of the present invention will be described. A predetermined paper substrate 1 is used in a roll shape. The basis weight is 30 to 40 g / m ² as a standard, but other than this, it may be used as long as it is within the limited range of this patent.

  Next, pattern printing is performed on the surface of the paper substrate 1. This pattern printing may be performed if requested. As a printing method, gravure printing, flexographic printing, offset printing, inkjet printing, or the like can be used. Next, a varnish layer is applied to the entire upper surface of the printing layer 2. As a method for applying the varnish layer, for example, gravure printing can be performed by gravure coating in-line with pattern printing. In addition, it may be coated by flexographic printing or offset printing.

  Next, as a method of applying the wax layer 4 to the back surface of the paper substrate 1, a roll coating method, a gravure coating method, a comma coating method, or the like can be used. These can be used properly depending on the characteristics of the paper substrate 1, the coating amount, and the state of the coated surface.

  The embossing on the back surface of the paper base material 1 is, for example, an embossing mold in which an embossing pattern is applied to the surface of a metal roll, the paper base material is held on the release side, and the rubber roll is pressed from the top surface side. Embossing can be performed by transferring the pattern on the roll surface to the back surface of the paper substrate 1.

  Although the method for producing the wrapping paper of the present invention has been described, other layers may be further laminated for the purpose of improving the required rigidity and durability in consideration of the use as a wrapping paper.

  The wrapping paper of the present invention has an excellent dead hold property as shown in FIG. FIG. 4 is an explanatory view showing an example of dead hold property of the wrapping paper shown in FIG. FIG. 4A illustrates an example of the folded state, and FIG. 4B illustrates an example of the opened state thereafter. Even if the repulsive force 7 to return is working, it has a dead hold property.

  The wrapping paper of the present invention has dead hold properties, unsealing properties, oil resistance in soft candies such as caramel, and releasability from contents. In addition, folding filling is possible without using a heater. It is an aluminum-less wrapping paper that can be inspected with a metal detector and has excellent incineration disposal.

Specific examples of the present invention will be described below .

<Reference Example 1>
Color ink of gravure ink {DIC Co., Ltd .: trade name GINK} on the surface of oil-resistant paper {Tenma Special Paper Co., Ltd .: trade name EC oil-resistant paper} having a basis weight of 30 g / m ^{2 as} a paper substrate And with varnish, pattern printing with an area of 20% on the surface and varnish printing with an area of 100% on the pattern with gravure printing, wax agent on the back side of the paper substrate {made by Toyo Adress Co., Ltd .: product Name K-350, softening point 75 ° C.} was melted at a liquid temperature of 140 ° C., and was applied by roll coating at a processing speed of 70 m / min to obtain a wrapping paper having an application amount of 10 g / m ² .

<Reference Example 2>
A wrapping paper was obtained in the same manner as in Reference Example 1 except that the amount of the wax applied in Reference Example 1 was 20 g / m ² .

<Example 1 >
In Reference Example 1, the basis weight of the paper substrate was 45 g / m ^2, and after printing, a fine grid embossed plate with a 1 mm pitch was used on the back surface, and after embossing by pressing, a wax layer was applied to the embossed surface. Wrapping paper was obtained in the same manner as in Reference Example 1 .

<Reference Example 3>
A wrapping paper was obtained in the same manner as in Example 1 except that the embossed surface was a surface on which a printed layer was laminated.

  Below, the comparative example of this invention is demonstrated.

<Comparative Example 1>
In Reference Example 1, a wrapping paper was obtained in the same manner as in Reference Example 1, except that the basis weight of the paper substrate was 50 g / m ² .

<Comparative Example 2>
In Reference Example 1, a wrapping paper was obtained in the same manner as in Reference Example 1, except that the basis weight of the paper substrate was 20 g / m ² .

<Comparative Example 3>
In Reference Example 1, a wrapping paper was obtained in the same manner as Reference Example 1 except that varnish printing was omitted.

<Comparative Example 4>
In Reference Example 1, a wax agent {manufactured by Toyo Adre Co., Ltd .: trade name K-05, softening point 65 ° C.} was melted at a liquid temperature of 130 ° C., and the same procedure as in Reference Example 1 was performed to obtain a wrapping paper.

The following evaluation was performed about each wrapping paper of Example 1 , Reference Examples 1-3 , and Comparative Examples 1-4.
-Evaluation of filling suitability was carried out by caramel filling and filling machine GD (Italy), and caramel filling and folding packaging was tested. If there was filling suitability, it was determined as “◯”.
For oil resistance, the packed sample was stored in a constant temperature and humidity chamber of 40 ° C.-75% RH for one month, and then the presence or absence of the oil component from caramel penetrated to the surface of the wrapping paper was evaluated. If there was no penetration, it was determined as “◯”.
The packaged filled sample was stored in a constant temperature and humidity chamber at 40 ° C.-75% RH for 1 month, and then the peelability of the contents from the wrapping paper was evaluated. Those completely peeled were judged as “◯”.
・ The dynamic friction coefficient is a value measured with an aluminum plate.
The results are shown in Table 1.

<Evaluation results>
In Example 1, Reference Example 1 and Reference Example 2 , filling suitability, oil resistance and peelability were good. In Reference Example 3 , since the pressing surface of the embossed plate is a printing surface, the repulsive force of the fiber of the paper base material in the folding process cannot be sufficiently reduced as compared with Example 1, and the folded ruled line portion The fluffing of the paper substrate was also noticeable. In Comparative Example 1, due to excessive basis weight of the paper base material, repulsion at the time of folding processing was strong, and filling suitability could not be obtained. As for Comparative Example 2, due to the basis weight of the paper base material being insufficient, the shape retention at the time of folding processing was lowered, and the oil resistance of the paper base material was also lowered, resulting in insufficient oil resistance as a wrapping paper. In Comparative Example 3, filling suitability and peelability were good, but the printing layer was only pattern printing and no varnish layer, resulting in insufficient oil resistance. In Comparative Example 4, although the filling suitability was good, the oil resistance and peelability were not good because the softening point of the wax was low.

DESCRIPTION OF SYMBOLS 1 Paper base material 2 Printing layer 3 Varnish layer 4 Wax layer 5 Embossed surface 6 Cellophane 7 Repulsive force to return 10 Wrapping paper

Claims (5)

A wrapping paper in which a varnish layer is laminated on the entire surface of a paper substrate and a wax layer is laminated on the entire back surface, the basis weight of the paper substrate being 25 to 45 g / m ² , and the coating amount of the wax layer being 5 to 30 g / a m ^2, (value measured by JIS K-7125) dynamic friction coefficient between the surface and the metal of the wax layer, Ri 0.1-0.2 der,
A wrapping paper , wherein a back surface of the paper substrate is embossed by an embossing mold, and the wax layer is laminated on the embossed surface . The paper oil resistance of the base material (JAPAN TAPPI No.41: value measured by Kidd method), wrapping paper mounting serial to claim 1, characterized in that 5 or more. 2. The wrapping paper according to claim 1, wherein oil resistance (JAPAN TAPPI No. 41: a value measured by a Kid method) of the paper base material layer including the varnish layer is 5 or more. The wrapping paper according to any one of claims 1 to 3 , wherein a softening point of the wax layer is 70 ° C or higher. The adhesive strength between the wax layer and the paper base (value measured by JIS Z-1707 method), one of claims 1-4, characterized in that the 0.1~0.4N / 15mm 1 Wrapping paper according to item.

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