JPH03231661A - Surface material of absorptive product - Google Patents

Abstract

PURPOSE:To improve feeling of use after liq. absorption without spoiling smooth touch by constituting a surface material by coating a surface base material with a non-sticking resin at a specified area ratio and height. CONSTITUTION:An absorptive product has a constitution wherein an absorptive body is placed between a liq.-permeable surface material and a liq.-impermeable leakproof material. The surface material has a constitution wherein at least a part of the surface of a liq.-permeable surface base material 4 is coated with a non sticking resin 5 in an arbitrary continuous or incontinuous pattern and the ratio of the coated area to the surface base material is 30-70% and the height (h) after coating is made to be 30-400mum. As the surface base material, it is pref. that a non-woven fabric made of a fiber selected from polyethylene fiber, polypropylene fiber, rayon fiber and pulp fiber and having a weight of 8-300g/m<2> is used. In addition, as the non-sticking resin, a thermoplastic resin with a contact angle of 50-130 degrees and a frictional resistance with a glass surface of 200g or less.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a surface material used in absorbent articles such as sanitary napkins and disposable diapers.

[Prior Art] Generally, absorbent articles such as sanitary napkins and disposable diapers are
It has a structure in which an absorbent body is disposed between a liquid-permeable surface material and a liquid-impermeable leakage prevention material, and the surface material may be an absorbent cloth such as a nonwoven fabric, a perforated plastic film, or a nonwoven fabric. The surface of which is coated with non-adhesive resin (￥Release date: 6:3-
30416) etc. are used.

However, it is important to note that non-woven fabrics do not feel good to the touch before absorbing liquid; after absorbing body fluids, body droplets tend to remain on the surface and become sticky, so they always feel moist and absorb liquid. The feeling of use after use is poor. On the other hand, perforated plastic films, on the other hand, do not feel good when used after absorbing liquid, but have the drawbacks of being rough and uncomfortable to the touch, and prone to rashes. The stickiness characteristic of the film becomes stronger and the absorbency decreases. Furthermore, non-stick resin coated on the surface of the non-woven fabric has the advantage that the degree of contact between the non-woven fabric and the skin is adjusted by the non-stick resin, so it feels good when used after absorbing the liquid. In order to obtain these advantages, it is necessary to increase the application area of the non-stick resin to some extent, and if the application area is increased, there is a problem that the good texture and liquid absorption properties of the nonwoven fabric will be impaired. .

[Problems to be Solved by the Invention] An object of the present invention is to absorb liquid without impairing the liquid absorbency and the texture before liquid absorption in a surface material made by applying a non-sticking resin to a surface base material such as a nonwoven fabric. The purpose is to improve the feeling of use afterwards.

[Means for Solving the Problems] In order to solve the above problems, 1 the surface material of the present invention has a non-adhesive resin applied to at least a part of the surface of a surface base material having liquid permeability in a continuous or discontinuous manner. After applying the pattern,
The coating surface is characterized in that the ratio of the area occupied by the non-stick resin to the surface base material is 30 to 70%, and the height after application of the non-stick resin is 30 to 400 gm.

The surface base material may be a nonwoven fabric composed of Fa fibers selected from polyethylene fibers, polypropylene Fa fibers, rayon fibers, and valve am, and having a basis weight of 200 g/m'. .

Also, heat melt! The use of a-fibers is a preferred embodiment of the invention.

Next, the non-sticking resin has a contact angle of 50 to 13
A thermoplastic resin having a friction resistance of 0 deg and a glass surface of 200 g or less is preferably used.

[Function] By setting the coating area ratio and coating height of the non-adhesive resin to a specific size, the foot surface material can be bonded to the surface base material without impairing the liquid absorbency or the texture before liquid absorption. The degree of contact with the skin is adjusted to an appropriate level, which improves the feeling of use after absorbing the liquid.

[Example] Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows a sanitary napkin as an example of an absorbent article constructed using the surface material of the present invention. It is composed of a liquid-permeable surface material 2 that covers the surface of the absorber 1, and a liquid-impermeable leakage prevention material 3 that covers the back surface of the absorber 1.

The above-mentioned absorbent material 1 is composed of a combination of one or more types of stable materials such as rayon and acetate, which have good absorbency, cotton-like bulbs, absorbent paper, and indestructible cloth, and if necessary, polymer Absorbent is added.

Further, the leakage preventive material 3 is made of a suitable water-impermeable material such as polyethylene film or waterproof paper.

On the other hand, as shown in FIG. 2, the surface material 2 includes at least a portion of the surface of the surface base material 4, which is made of a material that has liquid permeability and is good in liquid absorption and texture before liquid absorption. A non-adhesive resin 5 is applied in a desired pattern to adjust the degree of contact between the surface base material 4 and the skin. The ratio of the area occupied by the adhesive resin 5 is in the range of 30 to 70%, preferably 40 to 50%, and the height after application of the non-adhesive resin 5 is 30 to 400 l, preferably 100 to 2
The coating area ratio and coating height are set to be 00 pi. By setting the coating area ratio and coating height of the non-sticking resin 5 within such ranges, the surface substrate 4 and the skin can be bonded together without impairing the liquid absorbency of the surface substrate 1 and the texture before liquid absorption. It is possible to adjust the degree of contact with the liquid to an appropriate level, thereby improving the feeling of use after absorbing the liquid.

In addition, if the application area ratio of the non-adhesive resin 5 is less than 30%, the degree of contact between the surface base material 4 and the skin will increase, resulting in a poor feeling of use after liquid absorption, and the application area ratio will be less than 70%. If it exceeds this, the liquid absorbency of the surface base material 4 will be impaired. In addition, if the application height of the non-adhesive resin 5 is less than 30gm, the surface base material 4 will easily come into contact with the skin, resulting in a poor feeling of use after liquid absorption.If the application height exceeds 400gm, The liquid absorbency of the surface base material 4 is impaired.

As the surface base material 4, for example, polyethylene fiber,
Nonwoven fabrics made of polypropylene fibers, especially heat-melting fibers thereof (including composite fibers), and natural fibers such as rayon LA fibers and bulb M fibers are suitable, and the preferred range of basis weight is 8 to 300 g/m3. is 13-2DO
g/+".The basis weight of the surface base material 4 is 8 g/+++"
If it is lower, the strength will be insufficient and the resin will not be able to be applied or the fiber occupation density will be too low and the resin will not be fixed sufficiently.
If the thickness is higher, there may be problems such as insufficient penetration of body fluids into the absorbent material 1 in the lower layer, resulting in an increased feeling of dullness, or an extreme increase in the thickness, which may make it difficult for body fluids to pass through the surface material 2. arise.

On the other hand, as the non-sticking resin 5, specifically, one type of polymer such as polyethylene, ethylene vinyl alcohol, acrylonitrile, phtadiene, styrene, etc., or a mixture of several types thereof can be used. Since the non-adhesive resin 5 comes into direct contact with the skin, it is required that the resin itself has appropriate wetting properties and hardness, and is good to the touch. ~130 deg, preferably 80-110
degree and the frictional resistance with the glass surface is 2
00g or less, preferably 50g or less.

Here, the above-mentioned contact angle determines the wetting characteristics of the resin, and if it is less than 50 degrees, the hydrophilicity becomes strong and the surface becomes excessively easy to wet.
If the temperature exceeds deg, the water repellency becomes stronger, making it difficult for body fluids to be absorbed. That is, the contact angle is 50 to 1:10 d.
When it is within the range of eg, wood-philicity and water repellency can be balanced and appropriate wetting properties can be obtained. However, in order to make the surface of the non-adhesive resin 5 smooth, it is preferable that the resin has some degree of water repellency, and therefore it is most preferable that the contact angle is in the range of 80 to 110 degrees.

Furthermore, the above-mentioned frictional resistance is a standard for determining the hardness of the resin, and the non-adhesive resin 5 is applied to the surface base material 4 by 100 to 200%.
20 g
The sample was cut into 0.1 m length and placed on a glass surface that had been cleaned with alcohol, etc. at 1.0 g/cm2.
It is defined as the maximum force that can be withstood for 1 minute when pulled in the longitudinal direction under a load of . So this frictional resistance?20
If it is less than 0J, the resin will maintain appropriate hardness and the surface will feel smooth, or if it is larger than 200g, the resin surface will be soft and easily adhere to the skin, and it will be sticky even in the absence of body fluids. It makes me feel.

The non-sticking resin 5 can be coated on the surface base material 4 in any continuous or discontinuous pattern, and some of the coating patterns are illustrated in FIGS. 3 to 6.

In the case shown in FIGS. 3(A) and 3(B), a non-adhesive resin 5 is coated on the surface of a single-surface base material 4 in a honeycomb pattern. By creating a honeycomb coating pattern in this manner, the influence of the hardness of the non-stick resin can be reduced and the softness of the nonwoven fabric can be fully exhibited. In this example, the non-adhesive resin 5 is applied within the surface of a regular hexagon, and the surface base material 4 is exposed along the contour line of the regular hexagon formed between each non-adhesive resin 5. Alternatively, on the contrary, the non-adhesive resin may be applied along the contour line of a regular hexagon, and the surface base material may be exposed within the surface of the regular hexagon surrounded by the contour line.

Further, FIG. 4 shows an example in which the non-sticking resin 5 is applied in a grid pattern, FIG. 5 shows an example in which it is applied in a dot pattern, and FIG. 6 shows an example in which it is applied in a dotted line pattern.

In the absorbent article having the above configuration, the degree of contact between the surface base material 4 and the skin is maintained at an appropriate level by the non-adhesive resin 5 applied to the surface material 2. Even if the surface of the liquid is wet, it does not directly reach the skin, and the feeling of use after absorbing the liquid is good.

Next, a performance experiment conducted on the surface material 2 of the present invention will be described.

[Experimental Example I] As surface materials, one composite fiber, one heat-melting fiber, and one rayon were used as surface materials.
Non-sticking resin was coated with various coating patterns and coating area ratios on a hot air treated base material with a ratio of 1:1:1 to 12 [g/m], and these surface materials were used. A sample of a sanitary napkin as shown in Figure 1 was prepared using the above method.At this time, the absorbent material used was one in which absorbent paper was layered on the underside of the valve and a polymer absorbent was held between them. In addition, the surface material and the bulb were bonded by applying a hot melt adhesive made of styrene-phtadiene copolymer in a spiral at a ratio of 8 g/112.The results are shown in Table 1. If the overall evaluation is 3 or higher, the results are satisfactory.

Table ■ As can be seen from this result, there are cases where the coating area ratio of non-sticking resin is less than 30%, and when the resin height after coating is 301L11.
If it is less than 70%, the freshness will be insufficient, and if it exceeds 70%, the liquid absorption will be impaired.

Effects of the Invention As described above, according to the present invention, by setting the coating area ratio and coating height of the non-sticking resin to specific sizes,
It is possible to adjust the degree of contact between the surface base material and the skin to an appropriate state without impairing the liquid absorption property and the feel of the skin before liquid absorption, thereby improving the feeling of use after liquid absorption.

[Brief explanation of drawings]

Fig. 1 is a sectional view of a sanitary napkin constructed using the surface material of the present invention, Fig. 2 is a partially enlarged sectional view of the surface material, and Figs. 3 (A) and (B) are coatings of non-sticking resin. Front view and partially enlarged sectional view showing specific examples of patterns, Figures 4 to 6
Each figure is a front view showing different application patterns of non-sticking resin. 2 ・Surface material surface base material, non-stick resin, ・Height. Patent applicant Lion Corporation (1 other person) (1 other person) Figure Figure Figure Figure

Claims (2)

[Claims] 1. A non-adhesive resin is coated on at least a part of the surface of a liquid-permeable surface base material in a continuous or discontinuous arbitrary pattern, and the non-adhesive resin occupies the surface area of the surface base material on the coated surface. A surface material for an absorbent article, characterized in that the area ratio is 30 to 70% and the height after application of a non-sticking resin is 30 to 400 μm. 2. 2. The surface material for an absorbent article according to claim 1, wherein the surface base material contains 200 g or less of polyethylene fibers, polypropylene fibers, rayon fibers, and pulp fibers.