JP2006272946A - Lightweight board of good disposability - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lightweight board of good disposability, which is disposable, remarkably lightweight, and further holding toughness, heat insulation, hygroscopic and gas permeation properties. <P>SOLUTION: The board is composed as follows. A solution of high molecular weight siloxane and silanol salts is applied to a desired thickness on an inner surface of an outer layer member comprising paper stocks such as paperboard, ordinary and Japanese papers; and another outer layer member is press-laminated. The above is heated so as to control its foaming between 5 to 30 in expansion ratio and to reach 100°C or more, thereby a silicon oxide state inorganic porous foamed layer is unified and firmly cemented with the outer layer members. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention is easy to dispose of after use, is lightweight and tough, has excellent heat insulation, moisture absorption and air permeability, and is extremely suitable for transport packaging box materials, storage box materials, interior ceiling materials, etc. It is related with the lightweight board material excellent in.

For storage box materials such as present packaging boxes and clothes boxes, it is preferable that the materials have a low environmental pollution load or can be reused after use, and are relatively lightweight and excellent in structural strength. Therefore, corrugated cardboard material, particularly double-sided cardboard material, is mainly used, and the double-sided cardboard is formed by laminating a corrugated core between liners made of paperboard, and the basis weight of the liner itself. In addition, since about 180 to 340 g / m ² is used and the basis weight of the core is about 125 to 135 g / m ² , the weight of the double-sided cardboard material is about 480 to 815 g / m. ^{In addition,} it is pointed out that when a product or a product is packaged or stored, it is still multiplexed and poor handling by women or girls is pointed out.

  In addition, when packaging and storage boxes made of double-sided cardboard are sealed with paper tape or cloth tape when transported or stored, ventilation is blocked and a temperature difference of 7 to 8 ° C or more occurs compared to the outside temperature. A large amount of dew condensation occurs on the inner wall surface of the packaging box or storage box, and when transporting or storing for a long time, the generation of cocoons or moisture causes degeneration or alteration of fruits, vegetables or foods, or odors that occur In addition, there is a problem that moisture is adsorbed or adhered to clothes or the like, resulting in contamination.

  On the other hand, as a ceiling material for interiors, so-called gypsum board in which calcium sulfate is sandwiched and laminated between two paperboards has been used in large quantities because it is lightweight, inexpensive and excellent in fire resistance. In addition to being discarded as an enormous amount of building waste when rebuilding, there is no effective reuse measure, and during mountain storage, there is a risk of sulfite gas being generated as a result of exposure to sunlight, wind and rain, etc. I have a big problem.

  As a result of repeated research in view of such problems, paper materials such as paperboard, paper and Japanese paper have relatively high heat resistance and are strong and low in elongation, and retain disintegration and decomposability in a natural environment, and Natural minerals such as volcanic ash and sand and inorganic industrial waste contain a large amount of silicon oxide, and the silicon oxide can be easily dissolved by an alkaline agent to form sodium silicate, that is, water glass. By condensing the silanol groups in the water glass, the molecular weight is increased to about 4,000 to obtain a siloxane and silanol salt multimolecular weight solution, or by dehydrating and concentrating the water, the siloxane and silanol salt. A multi-molecular weight gel is obtained.

  And this siloxane and silanol salt multi-molecular weight solution or gel-like substance generates a foam structure with a maximum expansion ratio of about 50 times with the evaporation of the water content by heating at 100 ° C. or higher, and with heating The present inventors have found that high fusing property has been created and can be firmly bonded to a wide range of materials such as paper, wood and metal, and have led to the present invention.

  It is an object of the present invention to provide a lightweight plate material that can be discarded and is extremely light and has excellent toughness, heat resistance, moisture absorption and air permeability.

  In order to solve the above-mentioned problems, the means used by the present invention is a paper material made of thin paperboard, western paper or Japanese paper, or cotton or linen, which can be collapsed or decomposed in a natural environment and is tough, low elongation and thin. The outer layer material made of a natural fiber fabric material is used on the front and back surfaces, and the siloxane and silanol salt multi-molecular weight solution or gel is applied or pasted to the inner surface of the one outer layer material to the required thickness. In addition, the other outer layer material is pressure-laminated and heated at least 100 ° C. while restricting foaming to 5 to 30 times, so that the inorganic porous foam layer made of silicon oxide is It exists in the lightweight board material which is excellent in the discardability which consists of the structure bonded integrally and firmly.

  According to the technical means of the present invention, the outer layer material on the front surface and the back surface is made of paper material or natural fiber fabric material, so that it is extremely thin, tough and low in elongation, and silicon oxide is sandwiched between the outer layer materials. In this state, the inorganic porous foamed layer having a foaming ratio of 5 to 30 times is integrally and firmly bonded with a required thickness. Reinforced by the outer layer material that adheres firmly to the backside, it can not only handle boxing workability, but also resist external impacts during transportation and handling as products such as packaging boxes and ceiling panels, as well as during storage and storage. Can be used for a long time.

  In addition, since the siloxane and silanol salt multi-molecular weight solution or the gel-like product thereof has a specific gravity of about 1.3, the bulk specific gravity of the inorganic porous foam layer occupying a large volume in the present invention is 0.26. From 0.04 to 0.04, the specific gravity is extremely low, the present invention is extremely light, and the integrated sandwich structure with the outer layer material also improves the compressive strength, making the handling much more convenient.

  The inorganic porous foam layer is porous together with the silicon oxide state, so that in addition to excellent heat insulation, the hygroscopic property and the outer layer material are also thin, and the paper material or natural fiber fabric is used. Demonstrates heat and air permeability, corrects the temperature difference from the outside air temperature, remarkably suppresses the occurrence of condensation, and prevents wrinkles. Odor and fouling are prevented.

  The outer layer material of the present invention is made of a paper material or a natural fiber fabric material, and most of the entire volume is made of a silicon oxide inorganic porous foam layer, so that it is exposed to sunlight and wind and rain in an outdoor natural environment after use. As a result, the absorption and disintegration of water absorption is promoted to assimilate with the soil, and when the siloxane and silanol salt multi-molecular weight solution is applied to the outer layer material during the formation of heat-foamed inorganic porous foam layer, a part of the solution is Since it penetrates into the outer layer material and is heated and foamed, the present invention as a whole also exhibits fire resistance and incombustibility.

  A siloxane and silanol salt multi-molecular weight solution is applied to the inner surface of one outer layer material made of paper to the required thickness, and the other outer layer material is pressure-laminated with each other, and the expansion ratio is limited to 5 to 30 times. A structure in which the silicon oxide inorganic porous foam layer and the outer layer material are integrally bonded to each other by heating at least 100 ° C.

  The embodiment of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a sketch of the present invention in which the outer layer material is a paper material, and the outer layer material 1 is a paper material 1A or natural fiber fabric depending on the specific purpose of use. The use of the material 1B is desired, and in the packaging box for transport and the storage box for storing products or products, the printability and use for displaying the standard such as the product or product to be transported or stored The paper material 1A is desired because it is required to be disintegrated or decomposed in a short period of time and to be as thin and strong as possible even when it is later disposed of in large quantities.

In this case, the paper material 1A includes a wide variety of paperboard, western paper, or Japanese paper. Examples of the paperboard include corrugated paper, liners, and the like, and the western paper includes packaging paper, kraft paper, roll paper, and thin paper or Japanese paper. Can be mentioned.
And in packaging boxes and storage boxes for transport, etc., the use of paperboard is desirable when the products or goods to be packed or stored are multiple and large shapes of 20 kg / box or more. A value of about 180 to 320 g / m ² is desirable.

And, since many of the general packaging boxes and storage boxes have a packaging weight or storage weight of 20 kg or less, the paper material 1A of the outer layer material 1 has a basis weight of about 70, such as kraft paper or roll paper. Up to about 90 g / m ² can be used, and in the case of a lighter weight, a thin paper having a basis weight of about 20 to 30 g / m ² can be used. In addition, it is possible to use these paperboard, western paper or Japanese paper for the ceiling material for the interior.

  Thus, on the inner surface of the outer layer material 1 made of the paper material 1A selected according to the purpose of use, as shown in FIG. 2, in order to foam and form a silicon oxide inorganic porous foam layer 3 by heat foaming, siloxane and The silanol salt multi-molecular weight solution 2 is applied 20 to a required thickness, and the other outer layer material 1 is further pressure-laminated 21 and heated and foamed 22.

  This siloxane and silanol salt multi-molecular weight solution 2 elutes silicon oxide contained in a large amount in natural minerals such as volcanic ash and rocks, and inorganic industrial wastes such as coal ash, casting waste sand, and incineration sludge with an alkali agent. In addition to the so-called water glass of sodium silicate, its molecular weight is increased to about 4,000 to 8,000 by the condensation action of silanol groups of the sodium silicate, and is contained by the increase in the molecular weight. The generation of a foam structure of up to about 50 times with the evaporation of moisture and the fusion property with heating are created, and the siloxane and silanol salt multi-molecular weight solution 2 has a solid content of siloxane and silanol salt. It is in the form of a low-viscosity aqueous solution comprising approximately 75 to 80% by weight of water in approximately 20 to 25% by weight.

  Therefore, when the siloxane and silanol salt multimolecular weight solution 2 is used, it is unsuitable for application with a sufficient thickness, and since it has a low viscosity, it is a smooth and smooth outer layer material 1 to be used. Since it is desired that the coated siloxane and silanol salt multi-molecular weight solution 2 maintain air permeability and water permeability to such an extent that they do not easily permeate, the paper material 1A is usually convenient.

In the present invention, the substantial thickness is mainly due to the silicon oxide inorganic porous foam layer 3 formed by heating and foaming the siloxane and silanol salt multi-molecular weight solution 2, and on the other hand, it is mainstream at present. Transport packaging boxes and storage boxes using double-sided cardboard have a thickness of about 3.0 to 3.3 mm for light weights, and a thickness of about 6.0 to 3.3 for heavy ones. It is about 6.6 mm.
As a result, in the present invention, the silicon oxide inorganic porous foam layer 3 formed by heat foaming can maintain its foam structure strength and light weight with a foaming ratio of 5 to 30 times. Therefore, the coating thickness of the siloxane and silanol salt multimolecular weight solution 2 to be coated is about 0.2 to 0.66 mm.

  Thus, after the siloxane and silanol salt polymolecular weight solution 2 was applied 20 on the inner side surface of the outer layer material 1 to the required thickness, the other outer layer material 1 was pressed and laminated 21 as shown in FIG. In addition, the foaming ratio is limited to an appropriate foaming ratio of 5 to 30 times, and is heated with a heating and pressing belt 22 that is sandwiched by heating and pressing at a temperature of at least 100 ° C. A silicon oxide inorganic porous foam layer 3 having a foaming ratio is bonded integrally with the outer layer material 1 and then cut to a required length with a cutting blade 23, whereby the outer layer material 1 is made of a paper material 1A. Invention product 4 is formed.

FIG. 3 is a sketch of the present invention 4A in which the outer layer material 1 is made of a natural fiber fabric material 1B. The natural fiber fabric material 1B is stronger than the paper material 1A and retains a design feeling unique to the fabric. It is extremely suitable for boxes, storage boxes, interior ceiling materials and wall materials.
On the other hand, since the natural fiber fabric material 1B has sufficient air permeability and water permeability, the low viscosity is applied in the application of the siloxane and silanol salt multimolecular weight solution 2 in order to form the silicon oxide inorganic porous foam layer 3. The siloxane and silanol salt multi-molecular weight solution 2 coated on the leaching from the weave 10B of the natural fiber fabric 1B makes it difficult to form the present invention 4A.

  Therefore, as shown in FIG. 4, the water content of the siloxane and silanol salt multimolecular weight solution 2 is dehydrated and concentrated to about 25 to 45% by weight to obtain a siloxane and silanol salt multimolecular weight solution gel 2A. Since plastic processing becomes possible with the conversion, the siloxane and silanol salt high molecular weight gel 2A is formed into a sheet or film having an appropriate thickness according to the width of the outer layer 1, and between the outer layers 1, 1. The outer layer material 1 can be formed of the natural fiber fabric material 1B to form the product 4A of the present invention by heating and foaming so that the foaming is restricted to an appropriate foaming ratio of 5 to 30 times. .

FIG. 5 is an enlarged cross-sectional view of the product 4A of the present invention in which the outer layer material 1 is made of a natural fiber fabric material 1B, and is heated and foamed into a silicon oxide inorganic porous material into the texture 10B of the natural fiber fabric material 1B. It can be understood that the porous foam layer 3 has intruded and is further firmly integrated.
Furthermore, FIG. 6 is an aspect view of the transport packaging box 5 formed using the product 4 of the present invention in which the outer layer material 1 is made of the paper material 1A.

The performance of the prototype 4 of the present invention will be described below. The basis weight of kraft paper is 75 g / m ² as the outer layer material, and the siloxane and silanol salt multi-molecular weight solution is coated on the inner surface to the required thickness. In addition, an outer layer material made of the same kraft paper is laminated under pressure, and the temperature is 140 ° C., the thickness is 6 mm, and the silicon oxide inorganic porosity is 10 times foamed and 30 times foamed. The performance of the product of the present invention in which the foam layer is integrally bonded is as shown in Table 1, and it is understood that the bending strength, which is a weak point of the inorganic porous foam layer, is particularly improved.

  Even with current cardboard box making technology, it is possible to easily create a transport packaging box, a storage box, a costume box, or the like.

  It is a sketch of the product of the present invention in which the outer layer material is a paper material.   It is explanatory drawing of the manufacturing method of this invention goods.   It is a sketch of the product of the present invention in which the outer layer material is a natural fiber fabric.   It is sticking explanatory drawing of a gel-like thing.   It is an expanded sectional view of the product of the present invention in which the outer layer material is made of a natural fiber fabric material.   It is an aspect figure of the packaging box for transport using this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Outer layer material 1A Paper material 1B Natural fiber fabric material 10B Weave 2 Siloxane and silanol salt multimolecular weight solution 2A Siloxane and silanol salt multimolecular weight gel 20 Coating 20A Adhesion 21 Pressure lamination 22 Heating pressure belt 23 Cutting blade DESCRIPTION OF SYMBOLS 3 Inorganic porous foam layer 4 This invention product whose outer layer material consists of paper materials 4A This invention product whose outer layer material consists of natural fiber fabric materials 5 The transport packaging box by this invention

Claims (3)

  A siloxane and silanol salt polymolecular weight solution is applied to one inner surface of an outer layer material made of paper material such as paperboard, paper or Japanese paper, and the other outer layer material is pressure-laminated and foamed. Disposability comprising a structure in which the inorganic porous foam layer made of silicon oxide is integrally and firmly bonded to the outer layer material by heating at 100 ° C. or more while restricting foaming to 5 to 30 times. An excellent lightweight board.   The lightweight board | plate material excellent in the discardability of Claim 1 formed by laminating | stacking a siloxane and a silanol salt multimolecular weight gel-like substance between required outer layers, and carrying out pressure lamination | stacking.   The lightweight board | plate material excellent in the discardability of Claim 1 or Claim 2 whose outer-layer material is a natural fiber fabric raw material which consists of cotton or hemp.

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