JP2008280063A - Packaging materials - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wrapping material having dead-fold properties without using aluminum foil and showing excellent waste disposal characteristics. <P>SOLUTION: The wrapping material comprises a wax layer (2) formed by coating wax on a paper substrate layer (1) at a coating amount of 2 to 8 g/m<SP>2</SP>or impregnating the substrate layer (1) with the wax at an impregnation amount of 2 to 16 g/m<SP>2</SP>in order to impart dead-fold properties to it. An inorganic filler (3) of either granular or flake-like structure with an average particle size in a long side direction of low molecular weight being 50 μm or less is added to the wax forming the wax layer (2) while its adding amount is within 20% or lower to the coating or impregnation amount of the wax. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention is a thin paper and requires a foldability (dead hold property) for packaging materials for individual packaging such as a bag, which has a dead hold property and can be disposed of without using an aluminum foil as in the past. It relates to an excellent packaging material.

  As a packaging material for individual packaging such as bags, a packaging material that is thin and foldable (dead hold) is required. Conventionally, as a countermeasure, a packaging material in which an aluminum foil is laminated on thin paper is used, and a function of dead hold property is provided to satisfy the suitability of a filling and packaging machine. However, aluminum foil has a problem in disposal, and it has long been desired to develop a packaging material that does not use aluminum foil.

  Therefore, as an alternative to aluminum foil, a vapor-deposited paper in which aluminum is vapor-deposited on thin paper has been developed (for example, see Patent Document 1), but the dead hold property is not sufficient and the disposal property is not perfect. It was.

  Therefore, as shown in FIGS. 4 and 5, a wax layer (2) formed by applying wax (see FIG. 4) or impregnation (see FIG. 5) to a paper base layer (1) made of thin paper is provided. A method of reducing the resilience when folded using wax paper is known.

  However, regardless of the type of paper, sufficient dead hold property was not obtained due to fiber repulsion. That is, as shown in FIG. 6A, by filling paper fibers with a low molecular weight resin component, as shown in FIG. 6B, when the wax paper is folded, the resin component of the wax extends. The paper can be folded, but when the folding is stopped, the paper tries to return. Initially, the return is shallow due to the resin being buried between the fibers, but as shown in FIG. 6 (c), the return force of the paper eventually wins, and the resin part is pushed and the dead hold property is reached. Is not enough.

  The wax is usually used for the purpose of imparting water repellency to paper (see, for example, Patent Document 2), and generally imparting dead hold properties is not the main purpose.

Prior art documents are shown below.
Japanese Utility Model Publication No. 60-177052 Japanese Patent Laid-Open No. 01-162893

  The present invention is intended to solve such problems of the prior art, and provides a packaging material having a dead hold property and an excellent disposal property without using an aluminum foil. Objective.

  The present invention has been made to solve the above problems, and the invention according to claim 1 of the present invention is such that a wax is applied to the paper base material layer (1) in order to impart dead hold properties. A packaging material provided with a wax layer (2) formed by impregnation, wherein a low molecular weight inorganic filler (3) is added to the wax forming the wax layer (2). It is.

The invention according to claim 2 of the present invention is the packaging material according to claim 1, wherein the applied amount of the wax is ² to 8 g / m2.

The invention according to claim 3 of the present invention is the packaging material according to claim 1, wherein the amount of the wax impregnated is ² to 16 g / m2.

  The invention according to claim 4 of the present invention is the packaging material according to any one of claims 1 to 3, wherein the inorganic filler (3) has a granular or flaky shape having an average particle size in the long side direction of 50 μm or less. A packaging material characterized by a structure.

  The invention according to claim 5 of the present invention is the packaging material according to any one of claims 1 to 4, wherein the added amount of the inorganic filler (3) is 20 by weight with respect to the amount of wax applied or impregnated. It is a packaging material characterized by being within%.

  The packaging material according to the present invention is a packaging material provided with a wax layer formed by applying or impregnating a paper substrate layer with a wax in order to impart a dead hold property, wherein the wax forming the wax layer has a low molecular weight. Since the inorganic filler is added, even if an aluminum foil is not used, it has a dead hold property and an excellent disposal property.

  Embodiments of the present invention will be described in detail with reference to FIGS.

  FIG. 1 is a side sectional view showing an embodiment of a layer structure by a coating method in a packaging material according to the present invention, and FIG. 2 is a side showing another embodiment of a layer structure by an impregnation method in the packaging material according to the present invention. FIG. 3 is a side sectional view for explaining a state of a test stage of dead hold property in the packaging material according to the present invention.

  As shown in FIG. 1, the packaging material of one embodiment according to the present invention is provided with a wax layer (2) formed by applying a wax to a paper base material layer (1) in order to impart a dead hold property. In this packaging material, a low molecular weight inorganic filler (3) is added to the wax forming the wax layer (2).

The application amount of the wax is preferably ² to 8 g / m ² . The inorganic filler (3) preferably has a granular or flaky structure with an average particle size in the long side direction of 50 μm or less, and the added amount of the inorganic filler (3) is based on the amount of wax applied. The weight ratio is preferably within 20%, and more preferably within 5% in consideration of dispersibility in wax.

  When the dead hold property test was attempted using the packaging material having the above-described configuration, a sufficient dead hold property was obtained, and thus will be described in detail with reference to FIG.

  A wax layer (2) formed by applying a wax to which a low molecular weight inorganic filler (3) is added to a paper base layer (1) in order to impart a dead hold property is provided (FIG. 3). In the packaging material shown in a), paper fibers are embedded with a low molecular weight resin, and the filler (3) may be embedded between the fibers depending on the size, or may be exposed on the surface.

Next, as shown in FIG. 3 (b), when such a packaging material is folded, the resin component of the wax is expanded and can be folded. However, the filler (3) is not stretched in the resin. Yes. Since the filler (3) is thus in the resin, the filler (3) is not crushed even after the surrounding resin is stretched, as shown in FIG. The effect of suppressing repulsion (dead hold property) is obtained.

  Next, as shown in FIG. 2, the packaging material of another embodiment according to the present invention is a wax layer (2) formed by impregnating a paper base material layer (1) with wax in order to impart dead hold property. ), A low molecular weight inorganic filler (3) is added to the wax forming the wax layer (2).

The amount of the wax impregnated is preferably ² to 16 g / m ² . The inorganic filler (3) preferably has a granular or flaky structure with an average particle size in the long side direction of 50 μm or less, and the added amount of the inorganic filler (3) is based on the amount of wax applied. The weight ratio is preferably within 20%, and more preferably within 5% in consideration of dispersibility in wax.

  Using the packaging material having the above-described configuration, when a dead hold property test was attempted in the same manner as in one example, a sufficient dead hold property was obtained.

  Next, materials constituting the packaging material of the present invention, manufacturing methods, and the like will be described in detail.

As the thin paper for forming the paper base layer (1), pure white roll paper, high quality paper, glassine paper, parchment paper and the like can be used. Moreover, as for the basic weight which shows the thickness of paper, about 30-70 g / m < ² > is preferable.

  Note that the wax layer may be formed by a coating method using cellophane, acetate, nonwoven fabric, or the like depending on the type of product to be individually packaged, required quality, application, and the like.

  Next, as the wax forming the wax layer (2), paraffin wax, microcrystalline wax, a mixture of paraffin wax and ethylene-vinyl acetate copolymer, maleated paraffin wax having an acid value of 70 to 140, ozokerite type Wax, Fischer-Tropes polyethylene wax, polyethylene wax having a polymerization degree of 3000 or less can be used.

  Next, the inorganic filler (3) includes synthetic calcium carbonate, natural calcium carbonate, titanium dioxide, magnesium oxide, magnesium carbonate, alumina (aluminum hydroxide), hydrated alumina, crystalline silica, fused silica, kaolin, talc. Synthetic mica, short glass fiber, anhydrous gypsum, barium sulfate, etc. can be used, but in consideration of cost, rigidity, whiteness, tastelessness, odorless physical properties, etc., it is a spindle-shaped flaky structure Calcium carbonate is preferred.

  Next, the method of forming the wax layer (2) on the paper base layer (1) is, in the case of coating, a known direct gravure roll coating method, three bottom reverse coating method or four bottom reverse method. The bottom reverse coating method, the kiss roll coating method, the squeeze roll coating method, the offset gravure coating method, the air knife coating method, the curtain coating method, the comma coating method, and the like, which are representative coating methods, can be used. In the case of the impregnation process to be impregnated, a dipping method, a spray method, or the like can be used.

Hereinafter, the packaging material according to the present invention will be described in more detail with specific examples.

<Example 1>
As shown in FIG. 1, the packaging material according to the present invention uses pure white roll paper having a basis weight of 50 g / m ^{2 for} the paper base layer (1), and carbonic acid is formed on the paper base layer (1). A packaging material of Example 1 was prepared by applying 3.2 g / m ^{2 of} paraffin wax to which 5% of calcium was added in a bottom reverse coating method.

<Example 2>
In Example 1, the packaging material of Example 2 was produced in the same manner as in Example 1, except that calcium carbonate was not added to the wax.

<Example 3>
As shown in FIG. 1, the packaging material according to the present invention uses glassine paper having a basis weight of 40 g / m ^{2 for} the paper base layer (1), and calcium carbonate on the paper base layer (1). A packaging material of Example 3 was prepared by applying 5.7 g / m ^{2 of} paraffin wax with 5% added by a bottom reverse coating method.

<Example 4>
In Example 3, the packaging material of Example 4 was produced in the same manner as Example 3 except that calcium carbonate was not added to the wax.

<Evaluation method>
Each packaging material obtained in Examples 1 to 4 is made into a strip of 15 mm × 50 mm, the strip is folded in half, a load of 200 g is applied for 30 seconds, the load is removed, and a further 30 seconds have passed. The degree of resilience was measured to evaluate the dead hold property. The results are shown in Table 1. In Table 1, in the evaluation judgment of dead hold property, “◯” is good and “Δ” is acceptable.

In Table 1, the result of having evaluated the dead hold property of each packaging material obtained in Examples 1-4 was described.

<Comparison result>
From Table 1, Examples 1 and 3 have good resilience of the packaging material of 30 to 40 ° and good dead hold properties, and can be adequately applied without twisting aluminum foil for twisted packaging such as straw. there were. Examples 2 and 4 are slightly inferior in dead hold property to 40 to 50 ° in the degree of restoration of the packaging material as compared with Examples 1 and 3, but it is not necessary to use aluminum foil for twist packaging such as wrinkles. It was something that could be managed.

It is a sectional side view which shows one Example of the layer structure by the coating method in the packaging material which concerns on this invention. It is a sectional side view which shows the other Example of the layer structure by the impregnation method in the packaging material which concerns on this invention. It is a sectional side view explaining the state of the test stage of dead hold property in the packaging material which concerns on this invention. It is a sectional side view which shows one Example of the layer structure by the application | coating method in the conventional packaging material. It is a sectional side view which shows the other Example of the layer structure by the impregnation method in the conventional packaging material. It is a sectional side view explaining the state of the test stage of the dead hold property in the conventional packaging material.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Paper base material layer 2 ... Wax layer 3 ... Inorganic filler

Claims (5)

  In a packaging material provided with a wax layer formed by applying or impregnating a wax to a paper base layer in order to impart dead hold properties, a low molecular weight inorganic filler is added to the wax forming the wax layer. A packaging material characterized by The packaging material according to claim 1, wherein the amount of the wax applied is ² to 8 g / m ² . The packaging material according to claim 1, wherein the amount of the wax impregnated is ² to 16 g / m2.   The packaging material according to any one of claims 1 to 3, wherein the inorganic filler has a granular or flaky structure with an average particle size in the long side direction of 50 µm or less.   The packaging material according to any one of claims 1 to 4, wherein the addition amount of the inorganic filler is within a weight ratio of 20% or less with respect to the amount of wax applied or impregnated.