JP2000175711A - Tricot fabric engageable/disengageable with molded hook- and-loop fastener with male engaging element of micro dimensional form - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a female hook-and-loop fastener high in productivity, extremely lightweight and thin with high flexibility and maintaining engaging strength even with repeated engaging/disengaging operation with an object male molded hook-and- loop fastener. SOLUTION: A female hook-and-loop fastener engageable/disengageable with a male molded hook-and-loop fastener member 1 with a micro dimensional form of 0.03 mm-0.36 mm in the vertical dimension of the protruding end of an engaging head part 23 extending in the intersecting direction from the stem upper end of a male engaging element 2 erected on one side of a base material 10 is formed of tricot fabric knitted in a plurality of knitted layers using a plurality of reeds arranged at least on front and in the rear. Front reed thread is formed of monofilament or multifilament of 10-30 denier, and rear reed thread is formed of multifilament of 30-75 denier. Knitting length of the rear reed is to be twice to three times as long as the knitting length of the front reed. This results in obtaining the female hook-and- loop fastener extremely lightweight and thin with high flexibility and excellent in durability without a lowering of engaging strength even with some dozen times of engaging operation like a diaper for nursing an adult.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a male molded surface fastener member made of a synthetic resin material having an extremely small dimensional form and a female female surface fastener made of a detachable fiber. In addition, the infant paper diaper relates to a tricot fabric having a minute loop layer on at least one side, which can sufficiently cope with a paper diaper for adult care.

[0002]

2. Description of the Related Art In recent years, disposable diapers have been widely used in place of conventional diapers made of fiber fabric or the like. At first, an adhesive tape was used as a waist fixing device of the disposable diaper. However, recently, a hook-and-loop fastener has been used because the adhesive strength is weak or the adhesive has many adverse effects.

It is important that the required shear strength is obtained rather than the peel strength as a surface fastener used for disposable diapers. Generally, disposable diapers for infants are discarded after one-time use. Therefore, it is sufficient that the endurance strength can withstand at most one or two disengagement operations, and it is particularly required that a reasonable price can be set as a disposable item. . Also, due to the nature of the product to be worn directly on the skin, the hook-and-loop fastener is naturally required to have flexibility, and in particular, a male comprising a large number of hook pieces and mushroom-shaped engaging pieces erected on the surface of the flat base material. A male hook-and-loop fastener having an engagement element is required to have a small tingling sensation when touching the skin.

[0004] For these reasons, instead of the conventionally widely known surface fastener made of fiber woven or knitted fabric,
Thin male molding with a male engaging element of minute dimensions suitable for disposable diapers in which a flat substrate made of synthetic resin material and a male engaging element that can be manufactured with high productivity and inexpensive are integrally molded Surface fasteners are disclosed in, for example, WO94 / 23610, JP-A-2-5947, JP-A-6-133.
Many of them have been developed as disclosed in, for example, Japanese Patent Application Laid-Open No. 808 and Japanese Patent Application Laid-Open No. 9-322812. On the other hand, the female surface fastener of the counterpart engaging and disengaging from the male molded surface fastener is also replaced with a surface fastener made of a normal woven or knitted fabric, and is made of a thin nonwoven fabric or a brushing treatment which can be manufactured at relatively low cost. Brushed knitted fabrics are used.

[0005]

The above-mentioned disposable diapers include, for example, disposable diapers for infants and infants, as well as disposable diapers for adult care. In the case of disposable diapers for babies and infants, they will not be used several times as described above.However, in the case of disposable diapers for adult care, for example, apply a pad with excellent liquid absorption to the diaper body. In many cases, the pad is used while being replaced, and each time the pad is replaced, the operation of engaging and disengaging the hook-and-loop fastener, which is the above-described engaging and disengaging tool, is repeated. Usually, the number of repetitions of the disengagement operation is 10
It is said to be about times. Therefore, a disposable diaper for adult care needs to have an engagement strength enough to withstand at least about 10 engaging and disengaging operations.

However, the conventional surface fasteners used for this type of disposable diaper, especially female surface fasteners, are a thin nonwoven fabric or a brushed knitted fabric which has been subjected to a brushing treatment as described above. The form of the pile collapses due to cutting or pulling, and the engaging strength is significantly reduced. Therefore, there is a strong demand for the development of a female hook-and-loop fastener, such as a disposable diaper for adult care, which can sufficiently withstand at least about 10 engaging and disengaging operations.

[0007] The present invention has been developed to meet such a demand, and its object is to provide a flexible, extremely lightweight and thin, and to engage with a mating male fastener by repeated engagement and disengagement operations. It is an object of the present invention to provide a highly productive female hook-and-loop fastener that maintains strength.

[0008]

Means for Solving the Problems The present inventors have studied from various viewpoints the structure and constituent materials of a female hook-and-loop fastener most suitable for achieving the above-mentioned object. In this type of disposable diaper, if a nonwoven fabric commonly used in the past is adopted to secure the above-mentioned durability, the fineness of the filament or staple fiber is increased, or a material having a high tensile strength is selected. There is a need.
Further, based on the instability of the pile form, it is necessary to perform a form stabilization treatment by back coating in addition to the heat setting. These all become thicker, which at the same time leads to an increase in weight and further to a cost increase.

[0009] From such a viewpoint, the use of nonwoven fabric is abandoned,
We examined brushed knits and pile knits that have been used in the past. In the case of the raised knit, post-processing such as brushing is inevitably required. In the case of the pile knit, it is necessary to increase the left and right swing of the warp to knit the pile, and then to raise the pile. In any case,
The number of processes increases, and equipment and equipment space are required, which leads to an increase in cost.

On the other hand, since the knit, particularly the tricot, is originally morphologically stable due to its knitting structure, it is extremely advantageous if a pile which can be easily formed and which can withstand pulling can be obtained. I thought it was. Therefore, assuming that a tricot is adopted as the female hook-and-loop fastener, it is particularly lightweight and thin, has high engagement strength and is highly durable. As a result of repeating examinations and experiments from various viewpoints on a knitting structure and a constituent material capable of forming a pile having a shape, the invention described in claims 1 to 8 of the present invention was achieved.

According to the first aspect of the present invention, the upper and lower wall thickness of the engaging head extending from the upper end of the stem of the male engaging element standing on one side in the direction intersecting with the stem is 0.03 mm to 0.2 mm.
A male molded surface fastener member having a minute size form of 36 mm and a female surface fastener member capable of being disengaged from a tricot ground knitted into a plurality of knitting layers using a plurality of reeds arranged at least in front and behind. And the front reed is 10
It is composed of 30 denier monofilament or multifilament, and the rear reed is composed of 30 to 75 denier multifilament, and the knitting length by the rear reed is 2-3 times the knitting length by the front reed. It is a tricot ground capable of engaging and disengaging from a small male molded surface fastener.

As described above, the female surface fastener according to the present invention has a male engaging element having a particularly minute dimension, and is associated with a thin and flexible male molded surface fastener made of synthetic resin. This is a thin and lightweight female surface fastener made of fiber that can be detached and maintain the required engagement strength even at least about ten times of repeated engagement and disengagement operations. It consists of a tricot ground that can be formed at the same time.

Here, the male engaging element having a minute dimensional form is a hook, mushroom, palm tree, T-shaped, inverted L-shaped, Y-shaped, etc. which have been widely known. ,
The shape of the engaging head is not limited, but it has an engaging head that extends from at least the upper end of the stem in a direction intersecting with the stem, and penetrates and engages with the other pile. The thickness in the vertical direction is in the range of 0.03 to 0.36 mm. And the thickness at the tip of the engagement head, regardless of the form of the engagement head, the tip curved portion that transitions from a curved surface that projects upward and curves to a curved surface that projects downward and curves In other words, if a curved portion protruding upward and curving into the pile, it can be engaged with the pile.

Therefore, in the tricot ground according to the present invention, in order to be able to engage with a minute pile, it is necessary to project upward from the tip of the engaging head to a curved surface. If the male engaging element is such that the upper and lower thicknesses of the curved surface portion that protrudes and curves in the range of 0.015 to 0.175 mm, which is approximately half of the above value, the required engaging strength is maintained. Disengagement becomes possible.

[0015] In order to stably produce the tricot fabric according to the first aspect of the present invention, it depends not on the knitting structure of the tricot but on the type of knitting yarn used and the knitting conditions thereof. It turned out that there were many.

Regarding the formation of the pile, it was confirmed that when the knitting length of the front reed is longer than the knitting length of the rear reed, the pile is formed stably on the surface of the cloth. The root of the pile was weakly pressed by the reed, and the durability was poor. In addition, the weight per unit area (basis weight) was large, and the target fabric could not be obtained. Therefore, a tricot knitted structure in which the pile was formed stably and the pile was not removed was sought.

When the tricot knitted fabric is knitted by a tricot machine using at least a plurality of reeds having a front reed and a rear reed, the front reed has a characteristic of being exposed on the surface of the fabric.
By utilizing this characteristic, it is presumed that the needle loop of the rear reed can be held down by the front reed that appears on the surface, and the pile is formed by the rear reed and the root of the pile is held down by the front reed. For example, it was considered that the shape of the pile could be stabilized and the durability could be improved. Next, when the formation of the pile by the rear reed and the knitting conditions by the front reed sufficient to suppress the root of the pile were examined, the following was found.

The knitting length of the front reed is set to one of the knitting length of the rear reed.
If the ratio is larger than / 2, the size of the pile formed by the rear reed is too small, resulting in an inferior engagement rate with the male hook-and-loop fastener having the above-described dimensional configuration. If it is smaller than 1/3 of the knitting length, the size of the pile made of the rear reed becomes large, and at the same time, the needle loop of the pile is weakly suppressed by the front reed and the pile comes off easily, resulting in poor durability. Therefore, the fabric cannot be used because it gives a thick feeling to the fabric and increases the cost.

On the other hand, when the knitting length of the front reed is set to 1/3 to 1/2 of the knitting length of the rear reed, the size and form of the pile formed by the rear reed are stabilized, and Sufficient suppression from the surface of the needle loop, which is the root of the pile with the thread, provides the required engagement strength, and the value is maintained even during repeated attachment / detachment operations, and the durability is excellent. Was confirmed. Therefore, in the present invention, first, the knitting length of the rear reed is set to be two to three times the knitting length of the front reed. Further, as defined in claim 3, it is desirable that the knitting length by the back reed is 2.2 to 2.5 times the knitting length by the front reed.

Even more surprisingly, when the knitting length of the rear reed and the knitting length of the front reed are within the above range, the sinker loop formed by the front reed also forms a minute pile. found. At this time, since the needle loops of the rear reed and the front reed hold the needle loops of each other, sufficient durability is ensured even when the pile is not practically used without a back coating, and the pile does not come off. . Therefore, the obtained tricot fabric is a knitted fabric having a soft feeling on both sides even if it is thin.

Further, the tricot fabric of the present invention is required to have not only a soft feeling but also flexibility as described above, as well as being light and thin without a thick feeling. In order to secure these characteristics, the thickness and material of the knitting yarn used have a great influence. That is, the front reed has a total fineness of 10 to 30 denier monofilament or multifilament, and the rear reed has a total fineness of 30 to 75 denier multifilament. The fineness per filament of the reed made of multifilaments is too small, the engagement strength is low and the durability is inferior. As in the present invention, the denier must be 2 to 5 deniers. As described above, the total fineness of the rear reed is set to 30 to 75 deniers in consideration of the basis weight and the engaging strength.

The difference in the knitting length between the back reed yarn and the front reed yarn may be such that the feeding speed of each reed is different as in the invention according to the fourth aspect, or the invention according to the fifth aspect. It is realized by making a difference in the braided organization as shown in FIG.

Also, the swing direction for each course of the rear reed and the front reed was examined, and the initial purpose was achieved even if both were swung in the same direction or in a symmetrical direction. From the forming characteristics, it is desirable that the swing direction of the rear reed and the front reed be the same as in the invention according to claim 6.

The basis weight of the tricot ground which is the object of the present invention,
That is, it is important that the weight per unit area of the tricot ground is light. Therefore, in claim 7, the basis weight of the tricot ground of the present invention is set to 110 (g / m ² ) or less.
Furthermore, in order for the knitting stability and the finished product to be lightweight and thin, the tricot fabric is knitted at a knitting condition of 24 to 32 gauge and 35 to 65 courses / inch as in the invention according to claim 8. It is preferable that the knitting condition is 38 to 45 courses / inch.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be specifically described below based on typical examples. FIG. 1 shows a knitting structure of a front reed and a rear reed. "Knitting conditions" (1) Kind of yarn used and knitting length Tetron was used for both the front reed and the rear reed for the knitting yarn used in this example. It is exposed on the front side of the tricot ground to be knitted.
Using a 0 denier monofilament, a pile is formed on the back side of the tricot ground. From the 18 filaments, the fineness of the filament unit is 2.78 denier to give the pile reinforce strength and softness. A multifilament having a total fineness of 50 denier was used. The knitting length of the rear reed was 2.36 times the knitting length of the front reed. In the present invention, the fineness of the front reed and the rear reed is not limited to the above value. Further, in the present invention, the front reed does not need to be a monofilament, and a multifilament can be used. Knitting yarn used in the present invention, in addition to Tetoron, for example, nylon,
Examples thereof include synthetic fibers and semi-synthetic fibers used for general clothing such as polypropylene.

(2) Knitting machine used A normal tricot knitting machine is used with two reeds, and the gauge is 28
The stitch was knitted at 40 courses / inch.

(3) Knitting structure As shown in FIG. 1, the knitting structure of the front reed was set to (1012) and the knitting structure of the rear reed was set to (1034). In this example,
The difference between the knitting length of the front reed and the knitting length of the rear reed is determined by the difference between the left and right traverse amounts (swing amounts) of each knitting yarn.
Even if the front reed and the rear reed have the same structure, a required knitting length difference can be obtained by making a difference in the yarn supply amount. Even in this embodiment, the knitting structure of the front reed is changed to (101
2) Change the knitting structure of the rear reed to (1023) or (104)
Even if 5), the intended purpose can be achieved.

The obtained tricot ground has a basis weight of 72 g / m.
² , it is extremely thin and the sinker loop of the front reed is small, but it forms a pile, so it is rich in soft feeling, and the engaging strength with the male molded surface fastener is used for adult care diapers. It has enough strength.

Further, when the obtained tricot fabric was repeatedly engaged and disengaged 12 times with the male molded surface fastener 1 shown in FIGS. 2 and 3, almost no decrease in the engagement strength was observed.
The male molded surface fastener 1 shown in these figures has been developed by the present applicant and has been previously filed as Japanese Patent Application No. 9-223909. Therefore, the specific description is omitted,
The specific dimensions will be briefly described.

According to these figures, a notch 23b is formed at the center of the front end of the engaging head 23 in the width direction. The notch 23b can be variously deformed. Engagement head 23
When the notch 23b as described above is formed in a part of the head, for example, if the width of the tip of the engaging head 23 that first engages with the other pile is the same as the conventional fine dimension, The thickness in the width direction of the stem 21, the neck portion 22, and the engaging head 23 is approximately two to three times the conventional thickness, and it is extremely difficult to fall down against the pressing force from the upper surface. Combined with the form of the engaging element having a plurality of engaging heads 23 which are branched in multiple directions and extend linearly through 22, the ease of engagement with the opposing pile is increased.

That is, as described above, the single stem 21
In the engagement element 2 having a plurality of engagement heads 23 branching from the same, there are two types of engagement modes with the pile which is the other engagement element. The first is when the pile piece engages with a single engaging head 23 that branches off from a single stem 21 and the second is when the pile branches off from a single stem 21 and extends. This is a case where it engages with a plurality of engaging heads 23 that come out. At the time of actual engagement, the two modes are mixed, and the peeling force and the engaging force at this time depend on the latter mode. However, in the engagement element 2, when the engagement element 2 is once engaged with the pile of the other party in any of the engagement modes, the thickness of the stem 21 and the neck 22 is smaller than the tip of the engagement head 23. Because it is sufficiently thick, it will have a very strong resistance to shear forces.

Further, a second characteristic of the engaging element 2 is that most of the engaging element 23 is formed on a flat surface P except for a tip portion of a top 23a of the engaging head 23, and the entire flat surface P is formed. The area is 20 to 50% of the surface area of the substrate 1. In the engagement element 2, as shown in FIG. 2, the flat surface P of the engagement head 23 bulges left and right in the width direction, and
3a '.

In FIG. 3, the engaging element 2 has a height H1 'between the vertex O of the tip 23c of the engaging head 23 and the surface of the substrate 10 of 0.2 to 1.2 mm. Same engagement head 2
3 has an extension length L1 from the stem 21 of 0.05 to 0.7.
mm and the height H2 of the stem 21 is 0 to 1.0 mm.
Here, the height H2 of the stem 21 refers to the dimension from the surface excluding the concave portion 10a formed on the surface of the base material 10 to the extended base end O 'of the engaging head 23, and When the concave portion 10a is provided, when the height H2 of the stem 21 is 0 mm, the stem 21 corresponding to the depth d1 of the concave portion 10a exists inside the concave portion 10a. Therefore, the dimension obtained by adding H1 'and d1 described above becomes the actual height H1 of the engagement element.

The male molded surface fastener for engaging with the tricot fabric of the present invention is not limited to the above-described dimensions, but may have the protruding end of the engaging head extending in the cross direction from the upper end of the stem of the engaging element. The above described vertical dimension is 0.03mm ~ 0.36m
If m, a male engaging element having a hook shape, a mushroom shape, or another general shape may be provided.

[Brief description of the drawings]

FIG. 1 is a knitting structure diagram of a tricot ground made of two reeds, which is a typical embodiment of the present invention.

FIG. 2 is a perspective view partially showing an example of a male molded surface fastener which is disengaged from the tricot ground.

FIG. 3 is an explanatory diagram for explaining dimensions of an engaging element of the male molded surface fastener.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Male molded surface fastener 10 Base material 2 Engagement element 21 Stem 22 Neck 23 Engagement head 23a Top 23a 'Swelling part 23b Notch part 23c Tip part

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yoshihiro Koike 700 Inaba, Inami-cho, Higashi-Tonami-gun, Toyama Prefecture Inside Inami Textile Co., Ltd. F term (reference) 3B100 DA06 DA07 4L002 AA07 AB02 CA01 EA05 FA06

Claims (8)

[Claims] 1. A small dimensional form in which a vertical dimension of a projecting end of an engaging head extending in a cross direction from an upper end of a stem of a male engaging element standing on one surface of a base material is 0.03 mm to 0.36 mm. A male hook-and-loop fastener member having the following features: a female hook-and-loop fastener member detachable from a male hook-and-loop fastener member, comprising a tricot ground knitted into a plurality of knitting layers using a plurality of reeds arranged at least in front and back, and the front reed yarn is 10 The reed is composed of 30 to 75 denier multifilament, and the knitting length of the rear reed is 2-3 times the knitting length of the front reed. A tricot ground capable of engaging and disengaging from a male molded surface fastener. 2. The tricot fabric according to claim 1, wherein the fineness of the rear reed in a filament unit is 2 to 5 denier. 3. The tricot ground according to claim 1, wherein a knitting length of the rear reed is 2.2 to 2.5 times a knitting length of the front reed. 4. The tricot fabric according to claim 1, wherein a difference in the knitting length between the rear reed and the front reed is based on a difference in yarn feeding speed. 5. The tricot fabric according to claim 1, wherein a difference in the knitting length between the rear reed and the front reed is based on a difference in knitting structure. 6. The tricot ground according to claim 1, wherein the swing direction of the rear reed and the front reed is the same for each course. 7. The tricot fabric according to claim 1, wherein the weight per unit area of the tricot fabric is 110 (g / m ² ) or less. 8. The tricot ground is 24-32 gauge,
3. The tricot ground according to claim 1, which is knitted under knitting conditions of 35 to 65 courses / inch.