JP3568593B2 - Manufacturing method of body fluid treated absorbent articles - Google Patents

Description

【００２０】
尚、表中の硬化状態の評価は下記の通りである。
◎；硬化部分発生せず。
○；硬化部分の発生が殆どない。
△；硬化部分が発生する。
×；硬化部分が著しく発生する。
【００２１】
【発明の効果】
本発明の体液処理物品の製造方法によれば、吸収体の圧縮生産時において、解繊されたパルプの積繊状態が不均一であったり、高吸水性ポリマーの散布状態が不均一である場合でも、吸収体に硬化部分を発生させることがなく、体液処理吸収性物品を製造することができる。
詳細には、圧縮面の素材の硬度をショアー Ａ−９０に調整することにより、パルプや高吸水性ポリマーからなる吸収体を圧縮する際、吸収体に局部的に偏在するパルプや高吸水性ポリマーの高密度部分に過剰な圧力がかからないように、圧縮面が変形するので、吸収体における硬化部分の発生を防止することができる。
【図面の簡単な説明】
【図１】図１は、実施例及び比較例において用いた圧縮ロールの圧力負荷状態を示す図面である。[0001]
[Industrial applications]
The present invention relates to a method for producing a body fluid-treated absorbent article that can prevent the occurrence of a hardened portion in a compression step of an absorbent body during the production of a body fluid-treated absorbent article such as a disposable diaper or a sanitary napkin.
Here, the hardened portion refers to a portion where the defibrated pulp or the water-absorbing polymer or the like constituting the absorber is densified and bound by high pressure during compression.
[0002]
Problems to be solved by the prior art and the invention
Conventionally, when manufacturing absorbent articles for treating body fluids such as disposable diapers and sanitary napkins, for the purpose of transporting and stabilizing the shape and reducing the thickness of the absorbent, defibrated pulp, water-absorbing polymer and A compression process is performed in which an absorber consisting of a backing and a backing sheet is passed through a slit portion adjusted to a constant pressure or a constant clearance using one or more pairs of compression plates or iron rolls.
[0003]
However, the absorbent obtained by performing the above-described compression step may have an uneven pile state of the defibrated pulp, an uneven distribution state of the polymer, and a locally increased density. In this case, the material is bound into a cardboard shape by mechanical compression and hardened to form a hardened portion. And when the said hardened | cured part arises in an absorber, there exists a problem that a user will feel uncomfortable and a problem will arise in workability.
[0004]
Moreover, it is very difficult to exactly equalize the laid state of the pulp or the scattered state of the polymer, and at present there is no effective means for reliably controlling these.
[0005]
On the other hand, when compressing, usually, a pattern called embossing is performed to prevent recovery after compression of the absorber, and depending on the pattern of the embossing, curing of the absorber is prevented to some extent or is less noticeable. You can. However, the embossing does not drastically improve the occurrence of the hardened portion, and there is a demand for a method for producing a body fluid treatment absorbent article that can completely prevent the occurrence of the hardened portion. It is.
[0006]
Therefore, an object of the present invention is to provide an absorbent body which is compressed even when the state of piled-up pulp is not uniform or the state of dispersion of the superabsorbent polymer is uneven during compression production of the absorbent body. An object of the present invention is to provide a method for producing a body fluid treatment absorbent article that does not generate a cured portion.
[0007]
[Means for Solving the Problems]
The present inventors have found that when the compression surface of the compression roller in contact with the absorber contacts and compresses the high-density portion of the absorber during compression production of the absorber, the high-density portion is deformed according to the hardness of the compression surface. Paying attention to the fact that if the hardness of the compression surface is adjusted, the compression degree of the absorber becomes uniform, and hard researches are not expected. By doing so, it was found that the above object can be achieved.
[0008]
Since the present invention has been made on the basis of the above findings, in a method for producing a body fluid treatment absorbent article including a step of forming and compressing an absorbent, the absorbent is spread on defibrated pulp and the pulp. It is formed with superabsorbent polymers, characterized in that the compression hardness of the material of the compression surface using a compressor having a compression plate or compression rolls was adjusted to Shore a-90 And a method for producing a body fluid-treated absorbent article.
[0009]
Hereinafter, the method for producing the body fluid-treated absorbent article of the present invention will be described in more detail.
In addition, as a body fluid treatment absorbent article obtained by the production method of the present invention, disposable diapers, sanitary napkins, incontinence pads, training pants and the like can be mentioned.
[0010]
The compression device used in the present invention is usually the same as that used in the compression process of the absorber, except that it has a compression plate or a compression roll having a compression surface formed of a material having a specific range of hardness. Can be used. In addition, the compression plate or compression roll having a compression surface formed of the above-described material may be provided on only one of the compression side and the compression side, or may be provided on both sides. Effective in preventing curing. Further, the above-mentioned material may be used only for a contact portion with the absorber.
[0011]
Material compression surface of the compression plate or compression rolls used in the compression device in the present invention, its hardness, in which has been adjusted to shea Yoa A-90. Further, the selection of the hardness of the material can be appropriately selected according to the target compressibility of the absorber and the basis weight of the pulp and the superabsorbent polymer.
If the hardness is less than Shore A-50, the compressibility is reduced, and if it is more than Shore D-80, the absorber is easily cured.
[0012]
The material is not particularly limited as long as it has the above hardness. Examples of the Shore A type material include natural rubber (NR), isoprene rubber (IR), styrene butadiene rubber (SBR), and butadiene rubber (BR). ), Chloroprene rubber (CR), acrylonitrile butadiene rubber (NBR), isobutylene isoprene rubber (IIR), chlorosulfonated polyethylene rubber (CSM), ethylene propylene rubber (EPDM), silicone rubber (Si), fluoro rubber (FKM), Rubber-based resins such as urethane rubber (U), thiocol (T), acrylic rubber (ACM, ANM), epichlorohydrin rubber (CHR), ethylene vinyl acetate rubber (EVA), chlorinated polyethylene (CM), Nosorex (NSX), etc. And Shore D The flop of the material, acrylic resin, cellulose resin, epoxy resin, fluorine plastic resins, ionomer resins, polybutylene resins, polyester resins, polyethylene resins, polypropylene resins.
[0013]
Thus, in the method for producing a body fluid-treated absorbent article of the present invention, when forming and compressing an absorbent body, the compression is performed by a compression plate or compression in which the hardness of the material of the compression surface is adjusted to the above range. It is performed by using a compression device having a roll. The absorber is formed using defibrated pulp and a superabsorbent polymer sprayed on the pulp.
Incidentally, in the production method of the present invention, except that the compression is performed as described above, it can be carried out in the same manner as a generally known method for producing a body fluid treatment absorbent article. As for the top sheet, the back sheet, the absorber and the like, those similar to known members can be used.
[0014]
【Example】
Next, the present invention will be described in more detail with reference to examples, but the present invention is not limited to these examples. Example 2 is a reference example of the present invention.
[0015]
[Example 1]
Using 15 g of defibrated pulp and 4.8 g of a superabsorbent polymer (main component is polyacrylic acid), an absorber web having a shape of 90 × 246 mm is formed, and “HTEM-300” (manufactured by Yuri Roll Co., Ltd., manual type) Using a test two-roll embossing machine), the absorber was pressed to a thickness of 3.5 mm to obtain an absorber. As a material for the compression surface of the receiving roll of the embossing machine, a roll made of NBR (acrylonitrile butadiene rubber) having a hardness of Shore A-90 (hereinafter referred to as roll A) was used.
The obtained cured state of the absorber after compression was organoleptically evaluated. The results are shown in [Table 1].
FIG. 1 shows a pressure load state of the roll by pressure-sensitive paper.
[0016]
[Example 2]
Except that as a material for the compression surface, Plastrol [trade name, manufactured by Yuri Roll Co., Ltd. (made of urea-containing resin)] (hereinafter referred to as Roll B), whose hardness is Shore D-78, was used. An absorber was obtained in the same manner as in Example 1, and the obtained cured state of the absorber after compression was organoleptically evaluated. The results are shown in [Table 1].
FIG. 1 shows a pressure load state of the roll by pressure-sensitive paper.
[0017]
[Comparative Example 1]
As a material for the compression surface, a bent-sure roll [trade name, manufactured by Yuri Roll Co., Ltd., (special hard rubber)] (hereinafter referred to as roll C), whose hardness is D-90, was used. An absorber was obtained in the same manner as in Example 1, and the obtained cured state of the absorber after compression was subjected to a sensory evaluation. The results are shown in [Table 1].
FIG. 1 shows a pressure load state of the roll by pressure-sensitive paper.
[0018]
[Comparative Example 2]
An absorber was obtained in the same manner as in Example 1 except that an iron roll was used as the material of the compression surface, and the obtained cured state of the absorber after compression was sensory evaluated. The results are shown in [Table 1].
FIG. 1 shows a pressure load state of the roll by pressure-sensitive paper.
[0019]
[Table 1]

[0020]
The evaluation of the cured state in the table is as follows.
◎: No cured portion was generated.
；: Almost no hardened portion was generated.
Δ: A cured portion is generated.
X: A hardened part is remarkably generated.
[0021]
【The invention's effect】
According to the method for manufacturing a body fluid-treated article of the present invention, during compression production of an absorbent body, the state of piled-up pulp is not uniform, or the state of dispersion of the superabsorbent polymer is not uniform. However, it is possible to manufacture a body fluid treatment absorbent article without generating a cured portion in the absorber.
Specifically, by adjusting the hardness of the material of the compression surface to Shore A- 90 , when compressing an absorbent made of pulp or a superabsorbent polymer, pulp or superabsorbent polymer locally localized in the absorbent is compressed. as not to apply excessive pressure to the high density portion of the compression surface is deformed, it is possible to prevent the occurrence of cured portions of the absorbent body.
[Brief description of the drawings]
FIG. 1 is a drawing showing a pressure load state of a compression roll used in Examples and Comparative Examples.

Claims (1)

In the method for producing a body fluid treatment absorbent article including a step of forming an absorber and compressing,
The absorber is formed using a defibrated pulp and a superabsorbent polymer sprayed on the pulp,
A method for producing a body fluid-treated absorbent article, wherein the compression is performed using a compression device having a compression plate or a compression roll in which the hardness of the material of the compression surface is adjusted to Shore A-90 .

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