JP2845126B2 - Dry pulp nonwoven packaging - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention provides an industrial wipe, table napkin,
The present invention relates to a dry pulp nonwoven packaged article having a bag shape formed by packing a dry pulp nonwoven fabric suitably used as a sanitary napkin, cooking paper, towel, or the like in a packaging bag made of a polymer sheet.

[0002]

2. Description of the Related Art Dry pulp nonwoven fabrics are used in a wide variety of applications such as industrial wipes, table napkins, sanitary napkins, cooking papers and towels, and the production of dry pulp nonwoven fabrics is on an increasing trend.

[0003] Conventionally, dry pulp nonwoven fabrics are formed by fibrillating natural pulp, forming a web, applying an emulsion of a vinyl polymer compound, and drying the pulp fibers to bond the pulp fibers. It is manufactured in. The dry pulp nonwoven fabric thus obtained is processed and packaged according to the above-mentioned applications, and provided to consumers.

The dry pulp non-woven fabric is packaged in the form of a box wrapped in paper or the like or in the form of a bag wrapped in a polymer sheet or the like. Have been.

[0005] However, the dry pulp nonwoven fabric in the form of a bag packaged with the polymer sheet has a problem that when the packaging bag is opened, an unpleasant odor originating from the raw material is generated, and the commercial value is significantly reduced. . The main cause of this odor is the monomer present in the vinyl polymer emulsion used as an adhesive component during the production of the dry pulp nonwoven fabric, and the low molecular weight generated during the polymerization of the polymer emulsion. When the dry pulp nonwoven fabric is wrapped in a polymer sheet bag, these materials evaporate into the bag and generate an unpleasant odor when the bag is opened.

Therefore, as a method of improving the odor, for example, the polymerization of a vinyl polymer emulsion as a raw material of the adhesive is carried out by a method in which the monomer or the decomposed substance is not generated as much as possible, or the drying during the production is carried out for a longer time. For example, a method of minimizing the amount of the above-mentioned monomer or low molecular weight decomposed substance has been implemented. However, it is impossible to completely remove the above-mentioned odor-causing substance by any method, and after the packaging, the trace components are volatilized and filled with time, and the odor is exhibited when the bag is opened.

[0007] Therefore, at present, it has not been possible to find a remarkable effect of preventing the generation of an odor by the conventional improvement measures.

The present invention has been made in view of the above circumstances, and provides a dry pulp nonwoven packaged article which does not generate an unpleasant odor when opened in a bag-like form in which a dry pulp nonwoven fabric is packaged in a packaging bag made of a polymer sheet. The purpose is to provide.

[0009]

The present inventor has conducted intensive studies to achieve the above object, and as a result, has found that dry pulp having a bag form in which a dry pulp nonwoven fabric is packaged in a packaging bag made of a polymer sheet. In a non-woven packaged article, the moisture content of the dry pulp non-woven fabric immediately before being packaged with the polymer sheet is set to 5% or less (% by weight, the same applies hereinafter), so that the packaging bag can be stored for a long time. The present inventors have found that it is possible to obtain a dry pulp nonwoven fabric packaging product that hardly generates an unpleasant odor derived from a raw material, such as a vinyl polymer emulsion, when opened, and has accomplished the present invention.

In the present invention, when the moisture content of the dry pulp non-woven fabric is within the range of 5% or less as described above, the dry pulp non-woven fabric in the packaging bag can be opened even if it has an odor derived from raw materials. No odor, but water content of 5
%, A strong odor is generated when opened. This is because when the moisture content is high, the moisture of the dry pulp nonwoven fabric evaporates in the package, and this water vapor also evaporates a small amount of components that generate the odor of the dry pulp nonwoven fabric, thereby worsening the odor. Conceivable.

Accordingly, the present invention relates to a dry pulp nonwoven packaged article having a bag shape obtained by packaging a dry pulp nonwoven fabric in a packaging bag made of a polymer sheet, wherein the dry pulp nonwoven fabric has a moisture content of 5% or less. Is provided in the above-mentioned packaging bag.

Hereinafter, the present invention will be described in more detail. The packaged article of the dry pulp nonwoven fabric according to the present invention has a bag form in which the dry pulp nonwoven fabric is packaged in a packaging bag made of a polymer sheet.

Here, as the dry pulp non-woven fabric, a non-woven fabric mainly containing natural pulp fibers and an emulsion of a vinyl polymer compound is generally used. This dry pulp nonwoven fabric is formed by forming a natural pulp fiber into a web shape, spraying an emulsion of a vinyl polymer compound as an adhesive component on the web, and drying the pulp fiber to bond the natural pulp fiber to a sheet-like nonwoven fabric. Can be manufactured. As the dry pulp nonwoven fabric, a nonwoven fabric using heat-fusible polymer fibers or the like instead of natural pulp fibers can also be used.

Further, as the above-mentioned vinyl polymer compound, any compound may be used as long as it is generally used for dry pulp nonwoven fabrics. For example, acrylic polymer and vinyl acetate polymer which generate a large odor can be used. Other, ethylene,
Acrylic acid or an ester thereof, methacrylic acid or an ester thereof, styrene, butadiene, monomer polymers such as vinyl acetate and copolymers thereof, and specifically, ethyl acrylate / butyl methacrylate copolymer, Examples thereof include an ethylene / acrylic acid copolymer, an ethylene / methyl acrylate copolymer, an ethylene / vinyl acetate copolymer, and a styrene / butadiene copolymer. The amount of the emulsion of the vinyl polymer compound used is the same as that of the above fiber 10
The solid content is preferably 50 to 30 parts by weight, particularly preferably 10 to 25 parts by weight with respect to 0 parts by weight.

The emulsion of these vinyl polymer compounds can be obtained by subjecting the vinyl polymer compound to emulsion polymerization by an ordinary method. Unavoidable. However, in the present invention, although there is no problem in terms of odor even if a monomer is present in the emulsion, the amount of the monomer in the emulsion is 5% or less, preferably 1% or less, Preferably, it is 0.5% or less.

Further, the dry pulp nonwoven fabric mainly composed of the above-mentioned emulsion of natural pulp fiber and vinyl polymer compound may contain, as optional components, a wetting agent for improving the liquid absorbing property and a crosslinking agent for improving the strength. , A disinfectant, a dye, and other additives can be added. Further, another polymer sheet, a heat-sealed fiber non-woven fabric, or the like may be laminated on the dry pulp non-woven fabric.

Examples of the polymer sheet for wrapping these dry pulp nonwoven fabrics include polyethylene, polypropylene, polyester, polyamide, polystyrene, polyvinyl chloride and polyvinylidene chloride. The polymer sheet is not limited to this, but among them, polyethylene, polypropylene, polyester, polyvinyl chloride, polyvinylidene chloride and the like having low moisture permeability are preferably used, and ordinary packaging using these polymer sheets is preferable. Bags are manufactured. The thickness of the polymer sheet is 5 to 50 μm.
m, particularly preferably 10 to 30 μm.

According to the present invention, in the dry pulp packaged article having a bag shape obtained by packaging the dry pulp nonwoven fabric in a packaging bag made of a polymer sheet, the moisture content of the dry pulp nonwoven fabric immediately before being packed with the polymer sheet is provided. Less than 5%,
Preferably, it is in the range of 1 to 5%. Reducing the moisture content of dry pulp nonwovens to less than 1% requires considerable cost and rapid packaging, and is impractical and exceeds 5%, e.g. % Dry pulp nonwoven fabric which has absorbed moisture up to more than 5%, and those which have a moisture content of more than 5% immediately after drying, are packaged in a polymer sheet and stored for about one month, which gives off odor. Can not achieve the purpose. The dry pulp nonwoven fabric easily absorbs water, and even if the water content immediately after production is 5% or less, it easily absorbs water and exceeds 5%. If the moisture content exceeds 5% immediately before packaging, the moisture content is adjusted to 5% or less by a normal drying method.

The article of the present invention can be provided with a perforated eye so that it can be easily opened in a packaging bag made of a polymer sheet. In this case, if the perforation is made small so that dust does not enter and the moisture content immediately after production is suppressed to about 1%, it takes a considerable time to absorb moisture until it exceeds 5%. Is handed to the user and the bag is opened. Furthermore, even if the water content exceeds 5% due to the presence of perforations, considerable air enters and exits at the same time, and the odor component is volatilized out of the polymer sheet, so that there is no odor problem. .

[0020]

The dry pulp packaged article of the present invention has a bag form in which a dry pulp non-woven fabric is packaged in a packaging bag made of a polymer sheet. It does not generate an unpleasant odor of origin, and can be suitably used as industrial wipes, table napkins, sanitary napkins, cooking paper, towels and the like.

[0021]

EXAMPLES The present invention will be described in detail below with reference to examples and comparative examples, but the present invention is not limited to the following examples.

Examples 1 to 3 and Comparative Examples 1 to 3 As shown in Table 1, dry pulp nonwoven fabrics were produced using emulsions of natural pulp and various vinyl polymer compounds, and were allowed to stand at each humidity. Then, various water contents shown in Table 1 were adjusted. A bag was prepared by packaging this dry pulp nonwoven fabric with a bag made of a polyethylene sheet having a thickness of 20 μm. After leaving the bag in the room for one month, the bag was opened, and the odor was organoleptically evaluated according to the following criteria. Table 1 shows the results. Odor evaluation criteria: ○ Almost no odor. △ Odor is slightly generated. ×: Odor is clearly generated.

According to the results shown in Table 1, the dry pulp nonwoven fabric before packing has a moisture content of more than 5% (Comparative Examples 1 to 3).
Is dry pulp nonwoven fabric having a moisture content of 1 to 5% (Examples 1 to 3)
It was confirmed that there was no odor after standing for months.

[0024]

[Table 1]

[Examples 4 to 8, Comparative Examples 4 to 8] The dry pulp nonwoven fabric produced as an active ingredient of 20% using various vinyl polymer emulsions shown in Table 2 was adjusted to a moisture content of 3% or 8%. Bags wetted and packaged with various polymer films shown in Table 2 were allowed to stand for one month, and the odor was organoleptically evaluated. Table 2 shows the results.

From the results in Table 2, it is clear that the dry pulp nonwoven fabric having a moisture content of 3% (Examples 4 to 8) has a smell clearly higher than that having a moisture content of 8% (Comparative Examples 4 to 8). The occurrence was found to be small.

[0027]

[Table 2]

──────────────────────────────────────────────────続 き Continuing on the front page (72) Motoko Takahashi 1-7-3 Honjo, Sumida-ku, Tokyo Inside Lion Corporation (72) Inventor Shinji Arai 270 Main Market, Fuji City, Shizuoka Prefecture (56) Reference Document JP-A-58-73560 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B65D 77/00

Claims (1)

(57) [Claims] 1. A dry pulp nonwoven packaged article having a bag shape obtained by packaging a dry pulp nonwoven fabric in a packaging bag made of a polymer sheet, wherein the dry pulp nonwoven fabric having a moisture content of 5% by weight or less is packaged. A dry pulp non-woven fabric packaging article characterized by being packaged in a bag.