JPH0429711A - Adsorbent supported fiber structural material - Google Patents

Abstract

PURPOSE:To make an air-diffusible wall by constituting cell walls holding an adsorbent of connection yarns set to a specific range of a fiber filling degree. CONSTITUTION:In an adsorbent supported fiber structural material, walls 4 characterized by that at least the single surface of a double knitted fabric consisting of two surface and rear base structures 1, 2 and the connection yarns 3 connecting both structures is composed of a mesh knitted fabric whose mesh size (a) is 2-15mm and the fiber filling degree of the connection yarns 3 extending from the meshes of the mesh knitted fabric to the meshes of the other structure is 0.2-0.5 are formed. The cells 5 formed by the walls 4 are filled with an adsorbent 6 and the double knitted fabric is covered with a sheet like article 7 at least on the side of the mesh knitted fabric.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a fibrous structure material carrying an adsorbent.

[Conventional technology: Conventionally, adsorbents such as activated carbon have been widely used for the purpose of purifying bad odors, toxic gases, etc. in the air, but as materials that support adsorbents in the form of flat plates) \ Nicum core material and lattice plate There is a type in which an adsorbent is filled in each core, and non-woven fabric, punched metal, wire mesh, etc. are bonded to both sides to restrain and support the adsorbent so that it does not move significantly.

[Problem to be solved by the invention]

However, in these materials, the adsorbent is supported by each wall of the honeycomb core or the lattice plate and the non-woven fabric on both sides. For example, when used in air filters or masks, the adsorbent is carried in the core of the honeycomb core or the lattice plate. If this condition is met, there is a problem in that air that is trying to be conveyed in the direction of the front and back is obstructed by the adsorbent and the wall, resulting in an increase in ventilation resistance.

In addition, when using a core material such as a honeycomb core as described above, the core material itself may be damaged. Due to its high illumination properties, the adsorbent-carrying material as a whole is extremely hard, and lacks cushioning properties and is therefore unsuitable for use in, for example, shoe insoles, perishable underlays for perishable foods, medical clothing, etc. .

It is an object of the present invention to solve the above-mentioned problems and provide an adsorbent-supported fiber structural material that has low airflow resistance and can impart stiffness.

[Means for Solving the Problems] As a result of intensive studies to solve the above-mentioned problems, the present inventors have discovered that at least one side of a double knitted fabric consisting of two ground textures on the front and back sides and a connecting yarn connecting them. The ground structure is a mesh knitted fabric with an opening of 2 mm or more and 15 mm or less, and the connecting yarn extending from the stitches of the mesh knitted fabric to the stitches of the other ground structure has a fiber filling degree of 0.2 or more and 0.5 or less. Along with forming
The inside of the cell formed by the wall is filled with an adsorbent,
It has been found that the problems can be solved by an adsorbent-supported fiber structural material characterized in that at least the mesh knitted fabric side of the double knitted fabric is covered with a sheet-like material, and the present invention has been achieved based on this discovery.

The present invention will be explained below with reference to the drawings. FIG. 1 shows a perspective view of the adsorbent-supporting fibrous structural material of the present invention. The present invention is characterized in that the ground structure 1 on one side of a double knitted fabric formed by the front side ground structure 1, the back side ground structure 2, and the connecting yarn 3 connecting these has a mesh shape with an opening a, and this mesh Connecting yarns 3 extending from the stitch to the other ground structure 2 form honeycomb-shaped cell walls 4, and the cells 5 formed by the walls are filled with an adsorbent 6, and the ground structure of the double knitted fabric is 1 is covered with a sheet-like material 7.

In order to achieve the present invention, it is first necessary that at least one of the ground textures of the double knitted fabric be a mesh knitted fabric, and that the mesh opening be 2 mm or more and 15 mm or less. In other words, if one of the ground textures is a mesh knitted fabric with so-called through holes, the adsorbent can be filled into the cells of the double knitted fabric, but if the mesh opening is smaller than 2 mm, the filler cannot be filled. Filling becomes difficult and ventilation resistance also increases. On the other hand, if it is larger than 15 mm, the filler will move easily inside the cells of the three-dimensional knitted fabric, and the supporting effect by the wall of the connecting yarn of the double knitted fabric will be lost. Something is necessary. The shape of this mesh is not particularly limited, but is preferably square, hexagonal or round from the viewpoint of shape stability. The opening in this case refers to the diameter of the through-hole portion of the mesh knitted fabric, and in the case of a polygonal type, refers to the distance between opposing sides.

Next, in the present invention, the connecting yarn of the double knitted fabric has a fiber filling degree of 0.2.
It is necessary to form a wall of 0.5 or less. The degree of fiber filling of the connecting yarn here refers to the length of the connecting yarn that is tightened in the entire area of the wall formed by arranging the connecting yarns that connect the stitches of the outer fabric and the lining fabric in a double knitted fabric. D refers to the ratio of the total cross-sectional area in the horizontal direction, and is expressed by the following formula
This is the value indicated by .

Here, De, connecting thread denier, ρ: connecting system specific gravity, C;
Several courses of connecting yarn in double knitted fabric/1 nch] (
Do not count the stitches in which the connecting yarn does not connect the stitches of the opposing ground weave. When the degree of filling of the connecting yarns is less than 0.2, particles of the filler easily pass between the connecting yarns, and the filler is held stationary within the double knitted fabric. It no longer functions as a wall. In addition, if the filling degree of the connecting yarn is greater than 0.5, the filler can be retained sufficiently, but the ventilation resistance of air that tries to proceed in a direction perpendicular to the wall formed by the connecting yarn becomes large. This increases the ventilation resistance of the entire adsorbent-supporting fiber structural material.

As an example of the fiber filling degree, when a double knitted fabric with a number of courses of 17 courses/1 nch is produced using 180 denier nylon monofilament yarn as the connecting yarn, the fiber filling degree of the wall formed by the connecting yarn is is about 0.2, and using the same monofilament yarn, it is about 42.
When a double knitted fabric of 5 courses/1 nch is produced, the fiber filling degree of the wall is about 0.5.

The connecting threads connecting the front and back fabrics extend substantially perpendicularly to the fabric surface, but in order to improve the shape retention of the double knitted fabric, they are partially crossed in a diagonal direction. It may also have a structure in which it is extended to a length and reinforced to resist compressive force or the like. In particular, when used for items that are subjected to high compressive loads such as shoe insoles, the unit area (1 square inch) of double knitted fabrics is required to withstand high compressive loads and have appropriate cushioning properties.
The total cross-sectional area A of the connecting threads at each hit is 0.1 or more and 0.
It is preferable to set it to 25 or less. In this case, by setting the thickness of the double knitted fabric to 3 mm or less, it becomes more resistant to compressive force. In addition, if the insole of the shoe is not very hard, such as in a medical setting, and the insole is used for purposes that require cushioning that is comfortable for people to sleep on, the value of A is 0.
．． It is preferable that it is above 0.15 JJ and below 0.15 JJ.

Here, A is a value expressed by the following formula.

p De: Denier of connecting yarn, C: Number of courses of connecting yarn (pcs/
+nch), W: Number of wales of connecting yarn (pcs/1nc
h) The connecting system may be connected to the ground fabric by forming a loop-like stitch in the ground fabric or by being hooked onto the stitches of the ground fabric.

Further, in the present invention, in order to prevent the adsorbent filled in the cell portion of the double knit from protruding from the inside of the cell, the surface of the double knit where the ground structure is a mesh knit fabric is covered with a sorted material. . These sheet-like materials include non-woven fabrics, woven fabrics, knitted fabrics, wire mesh,
It is possible to use a material such as punched metal that can cover the adsorbent inside the cell to prevent it from spilling out and that can also allow air to pass through. Methods for covering the mesh knitted fabric with this sheet-like material include a method of applying an adhesive resin to the surface of the mesh knitted fabric and adhering it by applying a press or heat treatment, or a method of covering the mesh knitted fabric with a sheet-like material with a low melting point resin attached to the surface. There is a method of bonding a low melting point resin or fiber by heat fusing by covering a mesh fabric on one side with a nonwoven fabric or the like made of a low melting point fiber and bonding it under heat. In addition, if the ground structure is formed of a knitted fabric other than a mesh fabric, the ground structure may be formed of any structure as long as the density of the silk fabric is as dense as necessary to prevent the adsorbent from spilling out. good. In this way, when using non-woven fabrics or fabrics that are not mesh knitted fabrics to cover the surface of the adsorbent-supported fiber structure material, use non-woven fabrics or fabrics that have the lowest possible airflow resistance when used in air filters, etc. whose purpose is to lower airflow resistance. It is preferable.

The thickness of the double knitted fabric of the present invention is free and may be selected depending on the purpose of use.

The fillers referred to in the present invention include activated carbon that is rich in fine pores and has a very large pore volume, adsorbents that perform physical adsorption such as silica genopa alumina gel, and those that involve chemical reactions such as iron oxide. Refers to substances such as adsorbents that can adsorb gas components in the air.

In addition to gas, it also includes highly absorbent materials that can adsorb moisture. The particle size of the adsorbent is about 4 mesh to 14 mesh so that it can be easily filled into the cells of the double knitted fabric and does not easily pass between the connecting threads that make up the cell walls. It is preferable to use

The fibers used in the double knitted fabric constituting the adsorbent-supporting fiber structural material of the present invention may be any fiber, such as synthetic fibers such as polyester nylon and acrylic, natural fibers such as wool and cotton, or recycled fibers such as Kinipla. may be used, and is not particularly limited.

In particular, if fibers with deodorizing, water and moisture absorption functions are woven onto the surface or into connecting threads, and combined with the adsorption function of the filler, the material can become even more highly functional. Furthermore, it is preferable to use monofilament synthetic fibers for the lining that provides sufficient shape retention and rigidity to the adsorbent-supported fiber structural material of the present invention. In particular, the effect is remarkable when monofilament yarn is used as the connecting yarn. Furthermore, by processing this double knitted fabric with a resin and curing it, the adsorbent-carrying fiber structural material can be made harder and have better dimensional stability.

[Example] - Examples of the adsorbent-supported fiber structural material of the present invention will be described below with reference to the drawings.

Example 1 FIG. 2 shows an example of the structure diagram of the double knitted fabric constituting the adsorbent-supported fiber structural material of the present invention. In this example, a double lancel machine 18G and a Kamamon 5K were used, and 150 denier 32 filament polyester fiber was used as the yarn constituting the mesh knitted fabric on both the front and back sides of the double knitted fabric, and the front side was Ll, L2,
The back sides were arranged on guides L5 and L6, and hexagonal mesh knitted fabrics were formed on the front and back sides, respectively. Furthermore, using 180 denier nylon monofilament thread, this is L3.
, A hexagonal cell was constructed by arranging it on the L4 guide to connect the front and back ground textures and forming a wall with the connecting thread. The double knitted fabric thus obtained was heated at 180°C.
After the shape was stabilized by heat-safe (1 minute), the stitch density was 26 courses/1 nch, the fiber filling degree of the connecting system was 0.3 with 7 wales, and the opening of the mesh fabric on the front side was 6 m [0
A structure with a thickness of 4.5 mm (connecting thread length L = 4 mm) was obtained.

The mesh knitted fabric on one side of the double knitted fabric has a basis weight of 40 g/m.
After bonding a two-layered nonwoven fabric made of single-sided heat-sealable fibers using a heat press, 150 g of activated carbon with a particle size of 6 to 8 mesh was added to the other side of the mesh knitted fabric.
m' was filled, and then a similar nonwoven fabric was placed on top of the nonwoven fabric and bonded with a hot press to obtain the adsorbent-supported fiber structural material of the present invention.

If you place the adsorbent-supported fibrous structural material obtained as above between the mattress and the sheets with the front side facing up and sleep on it, the air will circulate easily under the sheet and the air will circulate easily. This deodorizing sheet for bedding does not feel stuffy even when worn, and does not generate unpleasant odors such as sweat even after regular use for a while. It also had appropriate cushioning properties and did not cause discomfort such as being too hard. As a result of looking at the airflow resistance of the adsorbent-supported fibrous structural material in terms of pressure loss, the pressure loss of the adsorbent-supported fibrous structural material of the present invention is higher than that of the conventional adsorbent-supported fibrous structural material in which air does not pass through the cell walls. was approximately 1.5 mmH2O, and the pressure loss was approximately 40% lower than that of the comparative product. For comparison, an aluminum honeycomb with the same size and thickness as the double knitted fabric of the example was used, filled with the same amount of activated carbon, and covered on both sides with the same nonwoven fabric. The pressure loss was measured at a flow rate Q of 5 m/sec.

Example 2 FIG. 3 shows another organization chart of the double knitted fabric constituting the adsorbent-supported fiber structural material of the present invention. In this example, a double raschel machine 18G1 with a hook spacing of 3 mm was used.
Using filament polyester fibers, they were arranged in L1 and L2 guides to form a hexagonal mesh knitted fabric. In addition, the ground weave on the back side is made of 150 denier 32 filament polyester fibers, which are arranged in guides L4 and L5 to form a part of the ground weave, and at the same time, No. 30 single yarn cotton yarn is arranged in L6. was inserted into the ground texture of L4 and L5 to form the ground texture on the back side. Furthermore, using 180 denier nylon monofilament thread, this
They were arranged on the guide No. 3 to connect the front and back ground structures, and at this time, a hexagonal cell was constructed while forming a wall by the connection system. The thus obtained double knitted fabric was heat set at 180°C for 1 minute to stabilize its form, and the stitch density was 30.
Course/1nch, 16 wale/1nch, the fiber filling degree of the connecting yarn is 0.39, the opening of the mesh knitted fabric on the front and back is 3 mm, and the thickness is 0.26 cm (connecting yarn length L = 0.22
cm), a structure with A=0.2 was obtained.

Activated carbon with a particle size of 10 to 12 mesh was applied to the double knitted fabric at a rate of 100 g/m° through the through hole on the mesh knitted fabric side.
Fill it and then add a basis weight of 60g/m to the mesh knitted fabric side.
A nonwoven fabric made of single-sided heat-fusible fibers was placed and bonded by hot pressing to obtain the adsorbent-supported fiber structural material of the present invention. When the adsorbent-supported fiber structure material obtained as described above is used as an insole for shoes, it not only has deodorizing performance but also has high breathability, and due to the moisture absorption effect of the cotton thread, the feet do not get stuffy, and it has moderate cushioning properties. It was a comfortable shoe insole with good resilience.

〔Effect of the invention〕

In the adsorbent-supporting fibrous structural material of the present invention, the cell walls that hold the adsorbent are composed of connecting threads with a fiber filling degree within a specific range, so that the walls themselves are permeable to air. Therefore, when used in air filters, etc., when the inside of the cell is filled with adsorbent, the flow of air that is obstructed by the adsorbent and the wall passes through the wall itself and is alleviated, making it possible to prevent air from passing through the conventional wall. It has extremely low ventilation resistance and pressure loss compared to those without.

In addition, the adsorbent is supported by a double knitted fabric, and the connecting thread itself that supports compressive force has flexibility and resilience, so it can be used in shoe insoles, underlays for fresh food, medical sheets, etc. with moderate cushioning. It has properties such as resilience and repulsion.

[Brief explanation of drawings]

FIG. 1 is a perspective view schematically showing the structure of the adsorbent-supported fiber structural material of the present invention, FIG. 2 is a knitting organization diagram of Example 1, and FIG. 3 is a knitting organization diagram of Example 2. . 1.2... Ground texture of double knitted fabric, 3... Connecting yarn, 4... Cell wall, 5...
・Cenobe 6...Adsorbent, 7...Sheet-like material, a...Opening (plate). ] Figure Figure Figure

Claims (1)

[Claims] The ground texture on at least one side of a double knitted fabric consisting of two ground textures on the front and back sides and a connecting thread that connects them has an opening of 2 mm or more1
A mesh knitted fabric of 5 mm or less, in which connecting yarns extending from the stitches of the mesh knitted fabric to the stitches of the other ground structure form a wall with a fiber filling degree of 0.2 or more and 0.5 or less, and the wall is formed by the wall. 1. An adsorbent-supporting fibrous structural material, characterized in that an adsorbent is filled inside the cells, and at least the mesh knitted fabric side of the double knitted fabric is covered with a sheet-like material.