JPH07313549A - Absorptive wear - Google Patents

Abstract

PURPOSE:To provide absorptive wear for which there is no need to add materials to distinguish the front from the rear and by which a soft feeling on a design can be given without basically changing rigidity of a sheet. CONSTITUTION:In absorptive wear 10, a sheet to form an outside surface is formed of a heat meltable material, and a picture pattern R is formed at least in an outside surface part by a heat embossment or an ultrasonic seal. When it is used, a proper absorbing body 20 is interposed inside.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to absorbent wearable articles, and more particularly to absorbent wearable articles such as disposable training pants and disposable paper diapers for children.

[0002]

2. Description of the Related Art In absorbent wearable articles such as disposable training pants and diapers for infants, at least one of a front portion and a rear portion is marked so that the front and rear thereof can be easily distinguished. As this mark,
For example, the front target tape attached at the front
There are waist gathers with different colors, or character designs such as animals and printing of patterns such as characters that are preferred by children with different foreground and posterior times.

On the other hand, for example, in Japanese Unexamined Patent Publication No. 3-90602, a top sheet, a transparent back sheet, and a third member interposed between them are included, and the transparent back sheet and the third member are made of these materials. Bonding with a dot adhesive group of a color different from the ground color, forming a dense part of the dot adhesive group at a predetermined position to define a display element, and enabling this display element to be seen through a transparent back sheet A worn article is disclosed.

[0004]

In the case of attaching a front target tape, which is commonly used in the past, waist gathers with different colors, or pattern printing, the material cost increases.

However, the technique disclosed in the above publication is effective from the viewpoint of material reduction when the disposable training pants that do not use the front target tape are targeted.

However, the dense dot adhesive group is basically not for adhering the transparent back sheet and the third member, but is useful only for displaying a pattern, and for this reason. In addition, not only is the amount of the adhesive used for adhesion other than adhesion increased and it is not economical, and the part is strengthened, resulting in deterioration of the wearing feeling. In addition, since the dot adhesive group is colored, not only the adhesion points but also the pattern portions are conspicuous, which may result in overdesign, which lowers the commercial value.

Therefore, an object of the present invention is to absorb an absorbent material that does not require addition of a material for distinguishing front and rear, and that the rigidity of the seat basically does not change, and gives a soft feeling in design. To provide a sex wear article.

[0008]

In order to solve the above problems, the present invention provides a sheet forming an outer surface of an absorbent wearing article, or a sheet adjacent to an inner side of a transparent outer sheet as a pattern forming sheet. At least the outer surface of the pattern forming sheet is formed of a heat-fusible material, and the pattern is formed on at least the outer surface portion by heat embossing or ultrasonic sealing.

Here, the design can be formed on one of the front viewing period and the back viewing period, or can be formed with different designs on both sides. Further, it is preferable that the pattern is formed by a dot pattern.

[0010]

According to the present invention, when at least the outer surface of the pattern forming sheet is formed of a heat-fusible material and at least the outer surface portion thereof is subjected to heat embossing or ultrasonic sealing, the sheet is melted at the outer surface portion or the entire thickness. ,
The appearance is different from other parts. For example, when the sheet material is a non-woven fabric, the fiber density becomes dense,
It becomes transparent and can be clearly distinguished from other parts.

Therefore, if this design is formed, for example, only in the foreground, it is possible to distinguish the front and back of the absorbent article, and at the same time enhance the commercial value by drawing, for example, the face of an animal as the design. You can Moreover, since the pattern is formed by heat embossing or ultrasonic sealing, the sheet material is not strengthened as in the case of using an adhesive. Furthermore, heat embossing can be applied easily and quickly at an appropriate stage of the manufacturing process of the product,
As compared with the case where an adhesive is used, the manufacturing cost can be reduced and the manufacturing line can be speeded up.

Under the preferred embodiment of the invention, the heat embossing or ultrasonic seal is formed by a dot pattern, ie a discontinuous heat embossing or ultrasonic seal. This is because if it is made continuous, that is, if it is a continuous straight line or a curved line, when an external force acts on the sheet, there is a risk of breaking at the portion where the material is modified by receiving heat.

[0013]

The present invention will be described in more detail by way of examples with reference to the drawings. 1 and 2 show an example of disposable training pants as an absorbent wearing article,
FIG. 1 is a plan view of a semi-finished product at the stage of being cut out in an hourglass shape, and FIG. 2 is a front view after forming this into a pants shape. At the foreground 11 of the training pants 10, a pattern R in the shape of a dog's face is formed.

As the material of the training pants 10,
For example, synthetic fibers exhibiting heat-melting property, more preferably heat-melting property, such as polyethylene, polypropylene, polyurethane, polyester, etc., or non-woven fabrics thereof, or composite non-woven fabrics of the above-mentioned fibres, and simple film sheet etc. can be used. . As a method for producing a nonwoven fabric, a known production method can be adopted, and preferably, a dry method, a spun bond method, a melt blown method, a hydroentangling method (spunlace method) and the like can be mentioned.

It is particularly preferable to form it with a non-woven fabric. This is because when heat-embossing is applied to the non-woven fabric, the fibers are melted, or the fibers are heat-sealed to each other and become transparent, so that the difference in appearance from other parts becomes clear. Further, it is possible to make a distinction by the difference in bulk between the hot embossed portion and the non-bulky portion. As this non-woven fabric, one having a relatively small fineness, for example, a denier number of 6 d or less is preferable. The basis weight of the non-woven fabric is preferably ²⁰ to 90 g / m ^{2 in} basis weight. If it is less than 20 g / m ² , the absorbent wearing article may be broken when heat embossing is applied, and conversely, if it exceeds 90 g / m ² ,
The ratio of transparency is reduced and the material cost is increased.
The optimum range is 40 to 65 g / m ² .

A composite non-woven fabric having two layers can also be used. For example, polyester and polypropylene are mixed at a ratio of, for example, 70/30 to obtain a mixed first nonwoven fabric layer by a hydroentangling method, and polyurethane fibers are bonded to the second nonwoven fabric layer by a melt blow method. be able to. The first nonwoven layer is 30 g /
m ² , the second non-woven fabric layer 30 g / m ² , total 60 g / m ² .

The heat embossing can be performed by heating an embossing roll having an uneven surface or by using a roll facing the embossing roll as a heating roll.
On the other hand, in the case of using an ultrasonic seal, it can be applied by a method of applying an ultrasonic generator (horn) to an embossing roll or anvil that has been processed to have irregularities. The heating temperature is not particularly limited as long as it is equal to or higher than the temperature at which the fibers of the target sheet are thermally melted. For example, in the case of polypropylene or a material containing the same, the temperature may be 140 to 180 ° C.

In the present invention, as the pattern forming sheet,
When using a sheet of 2 layers or 3 layers or more, it is not necessary for each layer to exhibit heat-melting property, and it is sufficient if the outer layer portion merely exhibits heat-melting property. For example, when a non-woven fabric having a two-layer structure is formed by a non-woven fabric layer showing a heat-melting property on the low temperature side and a non-woven fabric showing a heat-melting property on the high temperature side, the heat embossing temperature is set to an intermediate temperature between them and the heat-melting process is performed on the low temperature side. The absorbent article can be manufactured with the non-woven fabric layer exhibiting the property as the outer surface. As the pattern forming sheet in the present invention, a laminated structure of a non-woven fabric and a plastic film sheet can also be used.

In the present invention, the design R may be a straight line design or a character as well as a curved design of the face of an animal or the like. As the pattern R, it is preferable to form dots as shown in FIG. 3 for the reason described above.

<Example> Polyester and polypropylene were mixed at a ratio of 70/30 to obtain a first non-woven fabric layer by a hydroentangling method, and polyurethane fibers were bonded thereto as a second non-woven fabric layer by a melt blow method. . The first non-woven fabric layer was 30 g / m ² , the second non-woven fabric layer was 30 g / m ² , and the total was 60 g / m ² . Further, heat sealing 2 was performed in a stripe shape from the first nonwoven fabric side to obtain a two-layered flute-shaped nonwoven fabric 1 which can expand and contract in the left-right direction in FIG.

From the first non-woven fabric side of the two-layer non-woven fabric 1 shown in FIG.
And the pattern R depicting the dog's face in the embodiment of FIG. 3 was formed by hot embossing (temperature 160 ° C.). As a result, the pattern appeared clearly. After that, as shown in FIG. 1, it is cut out in an hourglass shape, and the front and rear portions thereof are overlapped with each other to have a predetermined length, and the side portions thereof are adhesively or heat-welded to each other (the connecting portion is denoted by reference numeral 3).
2), the disposable training pants 10 shown in FIG. 2 were obtained. When this pants 10 is used, an appropriate absorber 20 is inserted inside.

Also, using the ultrasonic sealing method, substantially the same training pants could be obtained.

(Modification) The pattern forming sheet of the present invention is preferably used as an outer sheet of an absorbent article, but when the outer sheet is transparent, a sheet positioned inside the outer sheet is used. A pattern can be formed on the sheet, and this can be used as the pattern forming sheet according to the present invention.

Although striping is performed in the above embodiment, it is not particularly necessary to perform striping. Further, in the above-mentioned embodiment, the design is formed only in the front season of the absorbent wearing article, but it may be formed only in the rear season or in both the front season and the rear season. Here, in the case of forming the symbols on both the front and back portions, it is desirable to form different patterns for distinguishing the front and back.

[0025]

As is apparent from the above description, according to the present invention, it is not necessary to add a material for distinguishing front and rear, and the rigidity of the seat is basically unchanged, and It has advantages such as being able to give a soft feeling.

[Brief description of drawings]

FIG. 1 is a plan view of an absorbent wearing article material according to the present invention.

FIG. 2 is a front view of a product state.

FIG. 3 is an enlarged view of a symbol formed in a dot pattern.

[Description of Reference Signs] 1 ... Absorbent article material, 3 ... Coupling portion, 10 ... Absorbent article,
20 ... Absorber, R ... Design.

Claims (3)

[Claims] 1. A sheet forming an outer surface of an absorbent wearing article,
Alternatively, the sheet adjacent to the inside of the transparent outer sheet is a pattern forming sheet, and at least the outer surface of the pattern forming sheet is formed of a heat-melting material, and a pattern is formed on at least the outer surface portion by heat embossing or ultrasonic sealing. An absorbent wearing article characterized by the above. 2. The absorbent wearing article according to claim 1, wherein the design is formed on one of the front and back portions, or both are formed with different designs. 3. The absorbent wearing article according to claim 1, wherein the design is formed by a dot pattern.