JP3049057B1 - Moisture proof paper - Google Patents

Abstract

An object of the present invention is to provide a moisture-proof paper that does not require selection of an adhesive necessary for bonding while maintaining recyclability, a manufacturing apparatus thereof, and a manufacturing method thereof. SOLUTION: A recyclable moisture-proof paper 1 in which a band-shaped base paper 2 is coated with a water-disintegrating desiccant, and one edge 3 of the base paper 2 is not coated with the water-disintegrating desiccant. 5 is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recyclable moisture-proof paper.

[0002]

2. Description of the Related Art In recent years, moisture-proof paper coated with a water-disintegrating moisture-proofing agent such as a wax emulsion, a resin emulsion, a latex, or a mixture thereof has been used in accordance with the growing trend of resource saving and environmental protection. (For example, JP-A-53-41511 and JP-A-56-41511).
148997, JP-A-61-47896,
JP-A-3-279492, etc.). Such moisture-proof paper is easily disintegrated in water because the moisture-proofing agent is water-disintegrating, and can be recycled as used paper.

[0003] Recyclable moisture-proof paper as described above is
Conventionally, a water disintegrating desiccant has been applied to the entire surface of the base paper.

[0004]

The above-mentioned conventional moisture-proof paper has the following disadvantages. That is, (1) When the edges of a plurality of moisture-proof papers or both edges of one moisture-proof paper are stuck together for the purpose of expanding the moisture-proof paper or processing it into a bag shape, It is necessary to apply an adhesive to the water-disintegrating desiccant applied surface, but there is a possibility that poor adhesion may occur due to a problem of compatibility between the used adhesive and the water-disintegrating desiccant. In order to prevent such poor adhesion, it is necessary to select an adhesive having good adhesiveness to the water disintegrating and moisture-proofing agent, and such selection requires time and effort.

(2) As described above, if only an adhesive having no water disintegration is selected in consideration of only the adhesiveness with the water disintegration desiccant, the obtained recyclability will be impaired. From this point of view, the range of selection of the adhesive is very narrow and not easy.

The present invention has been made in view of these disadvantages, and an object of the present invention is to provide a moisture-proof paper which does not require selection of an adhesive necessary for bonding while maintaining recyclability.

[0007]

The invention made to solve the above-mentioned problem is a recyclable moisture-proof paper in which a water-disintegrating moisture-proofing agent is applied to a belt-like base paper, and one of the base papers is provided. Alternatively, the moisture-proof paper has a non-coated portion of a water-disintegrating desiccant on both edges. Here, "edge"
It means an end of the band-shaped base paper with reference to the width direction.

[0008] According to this means, the adhesive is applied to the uncoated portion of the base paper having the water-disintegratable moisture-proof agent, so that the adhesive is applied to the surface coated with the water-disintegratable moisture-proof agent. Lamination can be performed without coating. Therefore, there is no need to select an adhesive in consideration of compatibility with a water-disintegrating desiccant such as a conventional moisture-proof paper. Therefore, the range of selection of the adhesive is widened, and the reduction of the recyclability by the adhesive can be easily prevented.

Further, in the case of a moisture-proof paper having a non-coated portion of the water-disintegrating desiccant on both edges of the base paper, the non-coated portion is formed on one edge by being cut in half in the longitudinal direction. There is a processing advantage that two sheets of moisture-proof paper can be manufactured by one lamination process.

Further, it is preferable that the uncoated portion of the water disintegrating desiccant is formed in a stripe shape parallel to the longitudinal direction of the base paper. According to this means, it is possible to achieve a high-dimensional balance between the adhesive property and the moisture-proof property at the bonding location as described above.

[0011]

Embodiments of the present invention will be described below in detail with reference to the drawings as appropriate. FIG. 1 is a schematic plan view showing a moisture-proof paper according to an embodiment of the present invention, and FIG. 2 is a schematic plan view showing a moisture-proof paper according to a form different from the moisture-proof paper of FIG.
FIG. 3 is a schematic perspective view showing an apparatus for manufacturing the moisture-proof paper of FIG.
FIG. 4 is a schematic sectional view showing an apparatus for manufacturing the moisture-proof paper of FIG.

The moisture-proof paper 1 shown in FIG. 1 has a coated part 4 and a non-coated part 5 of a water-disintegrating moisture-proofing agent on the surface of a strip-shaped base paper 2.
The uncoated portion 5 is formed on one edge 3 of the surface of the base paper 2, and the coated portion 4 is formed in a zone other than the edge 3.

The paper material of the base paper 2 constituting the moisture-proof paper 1 is not particularly limited.
Medium paper, bleached kraft paper, unbleached kraft paper, single-glazed unbleached kraft paper, liner paper, paper tube base paper, and the like can be used. The weighing of the base paper 2 is not particularly limited, but is appropriately selected from those of, for example, 30 g / m ² or more and 300 g / m ² depending on the purpose of use.

As the water disintegrating desiccant applied to the coating section 4, a conventionally used wax emulsion, resin emulsion, latex, a mixture thereof, or the like is used. Since such a water-disintegrating desiccant disintegrates easily in water, the moisture-proof paper 1 can be easily recycled as waste paper.

When the moisture-proof paper 1 is used, an adhesive is applied to the non-coated portion 5 so that the edges of the plurality of moisture-proof papers 1 are attached to each other to increase the width thereof, It becomes possible to form a bag by bonding both edges. Therefore, it is not necessary to consider the compatibility with the water-disintegrating moisture-proofing agent when selecting the adhesive as in the case of the conventional moisture-proof paper, and it is possible to easily prevent the recyclability from being lowered by the adhesive.

The moisture-proof paper 6 shown in FIG. 2 has a non-coated portion 1 of a water-disintegrating moisture-proofing agent on both edges 8 and 9 of the surface of the band-shaped base paper 7.
Nos. 0 and 11 are formed, and a coating portion 12 of the water disintegrating desiccant is formed in a zone other than both edges 8 and 9. The moisture-proof paper 6
The paper material of the base paper 7 and the water disintegrating desiccant in the above are the same as those of the above-described moisture-proof paper 1.

According to the moisture-proof paper 6, if it is divided in half by the center line in the longitudinal direction, two sheets of the moisture-proof paper 1 having an uncoated portion at one edge can be manufactured by one lamination process. . Also, the edges of a plurality of moisture-proof papers 6 and one moisture-proof paper 6
When the both edges are bonded, it is not necessary to consider the upper and lower sides of the bonding surface.

Next, the moisture-proof paper manufacturing apparatus 20 will be described. The moisture-proof paper manufacturing apparatus 20 is shown in FIGS.
As shown in FIG. 1, a cylindrical coater roll 21 disposed horizontally in the axial direction, a supply unit 22 for supplying a water-disintegrating desiccant 25 to the outer peripheral surface of the coater roll 21, and an outer peripheral surface of the coater roll 21 And a paper feed unit 24 for sequentially feeding the band-shaped base paper 23. The coater roll 21, the supply unit 22, and the paper supply unit 24 are the same as a general coating device.

The supply section 22 has a pan 26 into which the water disintegrating desiccant 25 is placed, and a metering roll 27 disposed in parallel with and in contact with the coater roll 21.
The lower part of the metering roll 27 is a water disintegrating desiccant 25
Is immersed in. Accordingly, the supply unit 22 has a function of applying the water disintegrating moisture-proofing agent in the pan 22 to the outer peripheral surface of the coater roll 21 by rotating the metering roll 27 in conjunction with the rotation of the coater roll 21.

The paper feed unit 24 is equipped with a take-out reel for mounting a base paper 23 wound in a roll shape (not shown), a tension control device for feeding the base paper 23 at a constant tension, and the like. Roll paper 21 onto coater roll 21
And run sequentially according to the rotation of the coater roll 21. Further, the paper feed unit 24 is provided with a pressing roll 28 around the coater roll 21, and the base paper 23 is pressed against the outer peripheral surface of the coater roll 21 by the pressing roll 28, and the water disintegrating desiccant 25 on the outer peripheral surface is removed. Base Paper 23
It has a function to transfer and apply to

The moisture-proof paper manufacturing apparatus 20 differs from a general coating apparatus in that the apparatus 20 is equipped with a doctor blade 29 unique to the present invention. The doctor blade 29 is provided so as to be able to come into contact with the outer peripheral surface of the coater roll 21, and of the water disintegrating desiccant 25 applied to the outer peripheral surface of the coater roll 21,
It has a function of removing the water disintegrating desiccant 25 attached to a position corresponding to the edge of the base paper 23.

The mechanism of the moisture-proof paper manufacturing apparatus 20 will be described. First, the water disintegration desiccant in the pan 22 is applied to the outer peripheral surface of the coater roll 21 by the rotation of the metering roll 27 in conjunction with the rotation of the coater roll 21, and the base paper 23 is applied to the outer peripheral surface of the coater roll 21. The base paper 23 is coated with a water-disintegrating desiccant by contact with the base paper 23. Before coating, the coater roll 21 is coated with a doctor blade 29.
By removing the water disintegrating desiccant at the position corresponding to the edge of the base paper 23 on the outer peripheral surface of the above, the production of the moisture-proof papers 1 and 6 becomes possible.

The method for manufacturing moisture-proof paper embodied in the above-described apparatus 20 for manufacturing moisture-proof paper is a method for manufacturing moisture-proof paper in which a base paper 23 is coated with a water-disintegrating moisture-proofing agent 25 by a coater roll 21, Base paper 2 on the outer peripheral surface of the coater roll 21
The method has a step of removing the water-disintegrating moisture-proofing agent 25 attached to the position corresponding to the edge of the third.

In the moisture-proof paper manufacturing apparatus 20, the supply unit 22 may not be equipped with the metering roll 27, and the coater roll 21 may be directly immersed in the water disintegrating moisture-proofing agent 25. It is also possible to provide a plurality of doctor blades 29 and form a stripe-shaped non-coated portion on the edge of the base paper 23. Further, by changing the width of the doctor blade, the width of the non-coated portion of the moisture-proof paper can be arbitrarily adjusted.

[0025]

As described above, according to the moisture-proof paper of the present invention, the selection range of the adhesive to be used for bonding is wide, and it is possible to easily prevent a decrease in recyclability due to the type of the adhesive.

[Brief description of the drawings]

FIG. 1 is a schematic plan view showing a moisture-proof paper according to one embodiment of the present invention.

FIG. 2 is a schematic plan view showing a moisture-proof paper having a form different from that of the moisture-proof paper of FIG. 1;

FIG. 3 is a schematic perspective view showing an apparatus for manufacturing moisture-proof paper of the present invention.

FIG. 4 is a schematic sectional view showing an apparatus for manufacturing the moisture-proof paper of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Moistureproof paper 2 Base paper 3 Edge 4 Coating part 5 Non-coating part 6 Moistureproof paper 7 Base paper 8 Edge 9 Edge 10 Non-coating part 11 Non-coating part 12 Coating part 20 Moistureproof paper manufacturing apparatus DESCRIPTION OF SYMBOLS 21 Coater roll 22 Supply part 23 Base paper 24 Paper supply part 25 Water disintegration desiccant 26 Pan 27 Metering roll 28 Press roll 29 Doctor blade

Claims (2)

(57) [Claims] 1. A recyclable moisture-proof paper having a band-shaped base paper coated with a water-disintegrating desiccant, wherein one or both edges of the base paper are not coated with the water-disintegrating desiccant. Moisture proof paper characterized by having. 2. The moisture-proof paper according to claim 1, wherein the uncoated portion of the water-disintegrating moisture-proofing agent is formed in a stripe shape parallel to the longitudinal direction of the base paper.