JP2002105815A - Three-dimensional knit fabric - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a light-weight three-dimensional knit fabric excellent in, gas permeability and body-pressure dispersibility, having an adequate cushioning property, and excellent in buckling strength, shape stability and slip-proof. SOLUTION: The three-dimensional solid knit sheet comprises a three- dimensional solid knit cloth produced with a double raschel knitting machine of 6-18 gauges. The total thickness of yarns constituting the meshes of the obverse and reverse knit cloths 2, 3 is set at >=550 dtex. The linking yarn 4 connecting the obverse knit cloth and the reverse knit cloth consists of a monofilament yarn. At least the obverse knit cloth 2 is constituted with a coarse part 20 knitted into a lace stitch texture such as mesh and a dense part 21 knitted at a spatial filling rate of 1.1-6 times that of the coarse part 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a three-dimensional three-dimensional knitted sheet used as a cushion sheet material such as a cushion sheet material for an automobile seat and a cushion sheet material for a chair, or as a partition or a partition.

[0002]

2. Description of the Related Art Cushion sheet materials for automobile seats and chairs are lightweight, have an appropriate cushioning property in the thickness direction, and have good air permeability and body pressure dispersibility. Is required.

Conventionally, as a cushion sheet material for meeting such a demand, a three-dimensional double knitted fabric has already been proposed. That is, there has been proposed a three-dimensional three-dimensional knitted fabric in which a front knitted fabric and a back knitted fabric knitted in a mesh structure are connected to each other with connecting yarns by a double Russell knitting machine having a double-row needle bed.

[0004]

However, the three-dimensional three-dimensional knitted sheet having the above structure is generally weak in so-called waist, and tends to sink excessively when buckling force due to seating is applied, and has good form stability. In addition, there is a problem that the feeling of use is inferior and fatigue and pain are apt to be felt after prolonged use. Further, there has been a problem that the buttocks of the seated person are liable to slip on the surface side and seating stability is poor.

The present invention has been made in view of such technical background, and is excellent in light weight, air permeability, body pressure dispersibility, moderate cushioning properties, excellent buckling strength, and form stability. An object of the present invention is to provide a three-dimensional three-dimensional knitted sheet having good properties and excellent anti-slip properties.

[0006]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a three-dimensional three-dimensional knitted fabric having a thickness of 3 to 35 mm in which a front knitted fabric and a back knitted fabric which are arranged apart from each other are connected by a connecting yarn composed of a monofilament yarn. And the three-dimensional knitted fabric is made of a knitting machine having a double-row needle bed of 6 to 18 gauge by 8 to 30 courses / 2.54 courses.
cm, and at least the outer knitted fabric has a sparse portion knitted into a perforated structure such as a mesh or a tricot, and a space filling ratio of 1.1 to 6 times the space filling ratio of the sparse portion. And a knitted dense portion, and in both front and back knitted fabrics, the total thickness of the stitches formed by the ground knitting yarn and the connecting yarn is set to 550 dtex or more. This is achieved by a three-dimensional knitted sheet.

The three-dimensional knitted fabric sheet is a three-dimensional knitted fabric having a thickness of 3 to 35 mm in which front and back knitted fabrics are connected with connecting yarns, so that it is lightweight, has excellent air permeability, and has excellent cushioning properties. Naturally, the knitting density of 8 to 30 courses / 2.54 cm is adopted by a 6 to 18 gauge knitting machine, and the total thickness of the stitches of the front and back knitted fabrics is set to 550 decitex or more, so that The connection portion between the knitted fabric and the connection yarn has excellent connection strength. In other words, the stitching force of the stitches at the connection portion of the connecting yarn is improved, and excellent cushioning properties are exhibited, and the body pressure dispersibility is also excellent. Further, since a monofilament yarn is used for the connecting yarn, the yarn has good cushioning properties and resilience.

Further, at least the outer knitted fabric is knitted with a sparse part knitted in a perforated structure such as a mesh or a tricot, and a space filling rate of 1.1 to 6 times the space filling rate of the sparse part. Because of the dense portion, the sparse portion maintains excellent air permeability and excellent cushioning, while the dense portion provides sufficient rigidity and remarkable buckling strength as a three-dimensional knitted sheet And excellent morphological stability without excessive sinking. In addition, the presence of the dense portion having excellent buckling strength suppresses excessive sliding of the buttocks, resulting in excellent anti-slip properties. Therefore, it is suitable as a cushion sheet material for an automobile seat, a cushion sheet material for a chair, and the like, and a good pin-up property is ensured in a dense portion. Since the plate-like shape can be sufficiently maintained, and transparency is given by the sparse portion, it is also suitable as a partition or a partition.

Preferably, the space filling ratio of the sparse portion is in the range of 2 to 30%, and the space filling ratio of the dense portion is in the range of 2.2 to 40%. By setting to this range, breathability,
The buckling strength, form stability, and pin-up property can be further improved while the cushion characteristics are further improved.

[0010] 1% or more of the connecting yarn constitutes a connecting layer having a truss structure which is obliquely shifted from the opposing stitches of the front and back knitted fabric to a stitch separated by one or more wales and / or one or more courses. In this case, the buckling due to the falling of the connecting yarn does not occur, and excellent cushioning and restoring force without directivity can be obtained.

Further, in the above configuration, the surface of the dense portion is configured to protrude outward from the surface of the sparse portion.
preferable. Since the surface of the dense part protrudes outward from the surface of the sparse part, an uneven surface is formed on the surface, which further increases the frictional resistance, so that the anti-slip property is further improved, and the seating is stable. The performance is improved.

Further, the arrangement density of the connecting yarns arranged in the region corresponding to the dense portion region of the surface knitted fabric is higher than the arrangement density of the connecting yarns arranged in the region corresponding to the sparse portion region of the surface knitted fabric. It is preferable that it is comprised so that it may become. As described above, the buckling strength is significantly improved by the presence of the dense portion in the knitted fabric, but the arrangement density of the connecting yarns arranged in the region corresponding to the dense portion is lower than that of the sparse portion corresponding region. The buckling strength is further improved, and the dimensional stability of the three-dimensional knitted sheet can be further improved.

[0013]

1 to 3 show one embodiment of a three-dimensional knitted fabric sheet according to the present invention. In the three-dimensional knitted fabric sheet (1), the front knitted fabric (2) and the back knitted fabric (3) are
A three-dimensional three-35 mm three-dimensional structure in which the two knitted fabrics (2) and (3) are connected to each other by a connecting yarn (4) that reciprocates between the two knitted fabrics while being spaced apart from each other by a predetermined distance. It consists of a three-dimensional knit. As shown in FIG. 3, the front knitted fabric (2)
Knitted structure provided with a large number of through-holes (20a) of mesh structure or the like in a regular arrangement, that is, a sparse portion (20) of a through-hole structure
And the dense portion (2
And 1) are alternately arranged in a row.
The configuration of the back knitted fabric (3) is similar to this. Both the front knitted fabric (2) and the back knitted fabric (3) have a sparse part (20) (30) and a dense part (21) (31) formed by a through-hole structure as in the present embodiment. However, the back knitted fabric (3) may have a structure without the dense portion (31) or a structure without the through-hole structure. In addition, as a through-hole structure | tissue, a tricot structure | tissue etc. can be illustrated other than the said mesh structure | tissue, for example.

[0014] The thickness of the three-dimensional three-dimensional knitted sheet (1) is 3 m.
When it is less than m, it is difficult to maintain good cushioning properties. On the other hand, when it exceeds 35 mm, the cushioning properties are excellent, but the form stability is poor. Above all, it is preferable that the thickness be in the range of 5 to 20 mm, since the shape stability can be further improved while maintaining good cushioning properties.

[0015] The three-dimensional knitted fabric sheet (1) is knitted by a knitting machine having a double-row needle bed, most commonly a double Russell machine. 6-18 gauge with relatively coarse placement density, ie 2.5
Using a knitting machine having 6 to 18 needle rows per 4 cm (1 inch), and the amount of knitting yarn drawn by the needle from the needle bed top end (second time) is about 1.2 to 3.0 mm, resulting in Needs to be knitted at a course density of 8 to 30 courses / 2.54 cm.

When the needle row density is less than 6 gauge or the course density is less than 8 courses / 2.54 cm, it becomes difficult to knit a knitted fabric having excellent form stability. Also, 1
When the thickness exceeds 8 gauge or exceeds 30 courses / 2.54 cm, the relationship between the thread thickness of the stitch portion formed by the ground knitting yarn and the connecting yarn becomes 550 decitex or more as described later. This makes knitting difficult. Preferably, a knitting machine of 8 to 18 gauge is used, and 8 to 28 courses /
It is preferable to adopt a knitting condition of 2.54 cm.

In the present invention, at least the front knitted fabric (2) of the front knitted fabric (2) and the back knitted fabric (3) needs to be composed of a sparse portion and a dense portion. The sparse part (20) (30)
Are knitted in a perforated structure such as a mesh or a tricot, while the dense portions (21) and (31) are 1.1 to 6 with respect to the space filling ratio of the sparse portions (20) and (30). It is knitted at twice the space filling rate. Sparse part (20)
The buckling strength of the three-dimensional knitted sheet (1) can be remarkably improved by the presence of the dense portions (21) and (31) while ensuring excellent ventilation and excellent cushioning properties by (30), and excessive sinking occurs. And excellent morphological stability. In addition, the presence of the dense portion having excellent buckling strength suppresses excessive sliding of the buttocks, resulting in excellent anti-slip properties. Therefore, it is suitable as a cushion seat material for an automobile seat, a cushion seat material for a chair, and the like, and has good pin-up properties (pin fixability when a pin is pierced) in the dense portions (21) and (31). In addition to being secured, the plate-shaped configuration can be sufficiently maintained even in the inverted state due to the presence of the dense portion, and the through holes (20a) (3
Since 0a) also provides a sense of transparency, it is also suitable as a partition or partition. The dense portion (2
1) The structure of (31) is not particularly limited as long as it is knitted with the space filling ratio in the above specific range. That is, as the organization form of the dense portion, for example, it may be knitted into a through-hole structure, or may be knitted into a dense organization form. For example, in the embodiment shown in FIGS. 1 to 5, a dense organization form is adopted as the organization form of the dense portion.

The space filling ratio of the dense portions (21) and (31) is 1.1 times the space filling ratio of the sparse portions (20) and (30).
When less than twice, the effect of the dense and dense knitting is not exhibited, and the effect of suppressing the slip of the buttocks becomes small,
When used as a partition or the like, good pin-up properties cannot be obtained. On the other hand, when the space filling ratio of the dense portions (21) and (31) exceeds 6 times the space filling ratio of the sparse portions (20) and (30), a sense of hardness is felt in the dense portion. The sitting comfort decreases. Above all, dense part (21)
(31) is more preferably knitted at a space filling ratio of 1.2 to 4 times the space filling ratio of the sparse portions (20) and (30).

The space filling ratio of the sparse portions (20) and (30) is preferably in the range of 2 to 30%. When it exceeds 30%, the air permeability is reduced due to the small space portion in the sparse portion, and it becomes difficult to obtain a good cushioning property.
Not preferred. On the other hand, if it is less than 2%, the strength is lowered, the body pressure dispersibility is also lowered, and there is a possibility of showing a tendency to sink, which is not preferable. Among them, the sparse part (20) (3
More preferably, the space filling ratio of 0) is set in the range of 3 to 25%.

The space filling ratio of the dense portions (21) and (31) is preferably in the range of 2.2 to 40%. 40%
Exceeding the range is not preferable because a feeling of hardness may be felt in the dense portion. On the other hand, if it is less than 2.2%, the buckling strength decreases, and when it is used as a partition or the like, it becomes difficult to obtain a good pin-up property, which is not preferable. In particular, the space filling ratio of the dense portions (21) and (31) is more preferably set in the range of 3.3 to 30%. The space filling ratio is a ratio defined by the following formula. That is, space filling rate (%) = 100 × W / (ρ × V) W (g): weight per 1 m ^{2 of} cloth (sparse or dense part of knitted fabric) ρ (g / cm ³ ): composition Average density of fiber V (cm ³ ): Volume of cloth (sparse or dense portion of knitted fabric) per 1 m ^{2 In the} above-mentioned front and back knitted fabrics (2) and (3), sparse portion (20)
The arrangement of the (30) and the dense portions (21) and (31) is not particularly limited. For example, the configuration may be such that they are alternately arranged in a row as shown in FIGS. 3 and 4, or the dense portion (20) as shown in FIGS. (21) may be arranged in rows in the vertical and horizontal directions, or the sparse portion (2) as shown in FIG.
A configuration in which the dense portions (21) are irregularly arranged in rows with respect to 0) may be employed.

In each of the knitted fabrics (2) and (3), the area ratio between the sparse portion and the dense portion is preferably set in the range of sparse portion / dense portion = 25/1 to 1/25. If the area ratio of the sparse portion is smaller than the lower limit, the air permeability is undesirably reduced.
On the other hand, if the area ratio of the sparse portion is larger than the upper limit, there is a possibility that the area tends to sink, which is not preferable. Among them,
The area ratio between the sparse part and the dense part is as follows: sparse part / dense part = 17/1 to 1/1
It is more preferable to set the range to 7.

In the present invention, it is preferable that the surface of the dense portion (21) is configured to protrude outward from the surface of the sparse portion (20) (see FIG. 5). By forming the uneven surface on the surface of the knitted fabric, the frictional resistance of the surface of the knitted fabric increases, and the dense portion having excellent strength becomes a convex portion, so that the frictional resistance further increases. In addition, slip of the buttocks is reliably suppressed, and thus the anti-slip property can be further improved.

The preferable value of the protruding height (h) is 5 mm or less. If it exceeds 5 mm, the unevenness of the surface of the knitted fabric becomes remarkable, so that it is difficult to obtain a good sitting comfort, and when it is used as a partition or the like, the flatness of the knitted fabric surface is deteriorated, so that the appearance and appearance are not preferable. The protruding height (h) can be further amplified by pulling the three-dimensional three-dimensional knitted fabric in the width direction with a tenter or the like after knitting.

The type and thickness of the ground knitting yarn for knitting the front and back knitted fabrics (2) and (3) are not particularly limited, but are relatively thick.
It is preferable to use a multifilament yarn or a spun yarn of 0 to 2800 dtex. When knitting with a thin thread of less than 280 decitex, it becomes difficult to provide the desired waist strength required for the three-dimensional knitted fabric.
Not preferred. On the other hand, it is not preferable to use a knitting yarn that is too thick exceeding 2800 decitex because knitting work becomes difficult and the texture of the surface of the knitted fabric is liable to decrease. In addition, a monofilament yarn may be used as the ground knitting yarn, but it is preferable to use a multifilament yarn or a spun yarn from the viewpoint of a feeling or the like.

In the present invention, the front and back knitted fabric (2)
It is necessary that the total thickness of the knitting yarn formed by the ground knitting yarn (3) and the connecting yarn (4) be 550 dtex or more. As a result, the stitching force of the stitches at the connection portion of the connecting yarn is improved, the form stability is improved, and good cushioning properties are exhibited, and the body pressure dispersibility is also excellent.
Above all, the total thickness of the stitches formed by the ground knitting yarns of the front and back knitted fabrics (2) and (3) and the connecting yarn (4) is 880 to 280.
It is preferred to be in the range of 0 dtex.

The connecting yarn (4) is knitted by reciprocating between the respective wales of the front and back knitted fabrics (2) and (3), and maintains a predetermined space between the two knitted fabrics to provide good air permeability and cushioning property. , And also to keep the strength of the waist. For this reason, it is necessary to use a monofilament yarn as the connecting yarn (4), and the thickness thereof is preferably 280 to 1100 decitex. Multifilament yarns cannot provide good restoring cushioning properties and sink excessively when subjected to body pressure loads. In addition, when using a monofilament yarn of less than 280 dtex,
It is not preferable because it is difficult to obtain sufficient waist strength,
It is not preferable to use a monofilament yarn exceeding 1100 dtex because the yarn becomes too hard, so that it is difficult to obtain an appropriate cushioning property, and also increases the weight and the cost.

The structure of the connecting layer between the front and back knitted fabrics (2) and (3) constituted by the connecting yarn (4) is 1% of the connecting yarn.
As described above, it is preferable that the truss structure has a truss structure which is obliquely shifted from the opposing stitches of the front and back knitted fabric to a stitch separated by one or more wales and / or one or more courses.
That is, the connecting yarn (4) may have a portion of the front and back knitted fabrics (2) and (3) that reciprocate between the mutually opposing stitches at substantially a right angle with both knitted grounds at a ratio of less than 99%. It is preferable to have 1% or more of a skewed portion that is obliquely shifted from one opposing stitch to one or more wales and / or one or more courses away from the stitch. With the structure of the connecting layer as described above, uneven buckling due to the falling of the connecting yarn (4) can be effectively prevented, and a cushioning property and a restoring force having almost no directivity can be maintained. Above all, 30% or more of the connecting yarn (4) has a truss structure which is obliquely shifted from the opposing stitches of the front and back knitted fabric to one or more wales and / or stitches separated by one or more courses. More preferred.

Further, the arrangement density of the connecting yarns (4a) arranged in the region corresponding to the dense portion (21) region of the surface knitted fabric (2) is lower than that of the sparse portion (20) region of the surface knitted fabric (2). It is preferable that the arrangement density is higher than the arrangement density of the connection yarns (4b) arranged in the corresponding area (see FIGS. 2 and 5). As described above, the buckling strength is significantly improved due to the presence of the dense portion in the knitted fabric, but the arrangement density of the connecting yarns (4a) arranged in the region corresponding to the dense portion is reduced. By making the area larger than that of the region, the buckling strength is further improved, and the dimensional stability of the three-dimensional knitted fabric sheet (1) can be further improved.

The material of the ground knitting yarn and the connecting yarn is not particularly limited. For example, synthetic fibers such as polypropylene, polyester, polyamide, polyacrylonitrile, rayon and the like, regenerated fibers, natural fibers such as wool, silk, cotton and the like can be mentioned. The above materials may be used alone, or some of them may be used in combination. The use of polyester fibers as the material is excellent in recyclability and is suitable. Further, the yarn shape of the ground knitting yarn and the connecting yarn is not particularly limited, and may be, for example, a circular cross-section yarn or a modified cross-section yarn.

The colors of the constituent yarns such as the ground knitting yarn and the connecting yarn are as follows.
For example, they may be the same color, similar colors, or mutually complementary colors, and are not particularly limited, and any combination can be adopted in view of design properties. The same color, similar color, and complementary color can be adopted for any of the relationship between ground knitting yarns, the relationship between connecting yarns, and the relationship between ground knitting yarns and connecting yarns.

In the above-described embodiment, the texture of the sparse portions (20) and (30) is knitted in a net structure with rhombic through holes (20a) and (30a) for both the front and back knitted fabrics (2) and (3). , Is not particularly limited to such a form,
For example, the knitted fabric (20) of the front knitted fabric (2) is formed into a net structure with rhombic through holes, while the sparse portion (30) of the back knitted fabric (3) is knitted into a net structure with hexagonal tortoise-shaped through holes. It is good.

In the embodiment shown in FIGS. 2 and 5, the top knitted fabric (2) and the back knitted fabric (3) are configured so that the phases in which the dense portions are arranged coincide with each other. In particular, the present invention is not limited to such a mutual arrangement relationship. For example, the phase in which the dense portion is arranged between the front knitted fabric (2) and the back knitted fabric (3) may be completely shifted, Alternatively, they may be arranged so as to be partially shifted.

The three-dimensional three-dimensional knitted sheet of the present invention (1)
Is suitably used as a cushion sheet material for an automobile seat, a cushion sheet material for a chair, a cushion sheet material for a bed such as a nursing bed, or a partition, a partition, etc., but is particularly limited to such applications. Not something.

It should be noted that in FIGS. 10 to 12 and FIG.
The marked places indicate the through-sights.

[0035]

Next, specific embodiments of the present invention will be described.

Example 1 A three-dimensional three-dimensional knitted sheet (see FIGS. 1 to 3) having the following specifications was knitted according to the knitting structure shown in FIG.

Knitting machine: Double Russell knitting machine (9 gauge /
2.54 cm, distance between kettles 15 mm) Wale density (sparse portion): 15.8 lines / 5 cm (8 lines / inch) Wale density (dense portion): 22.6 lines / 5 cm (11.5
Coarse density (sparse part): 25.6 lines / 5 cm (13 lines / inch) Course density (dense part): 25.6 lines / 5 cm (13 lines / inch) Finished thickness t: 11.24 mm Table Knitting yarn of knitted fabric: 1450 dtex / 96f polyester / BCF multifilament (crimped yarn) Knitting yarn of back knitting fabric: 1450 dtex / 96f polyester / BCF multifilament (crimped yarn) Connecting yarn: 660 dtex / 1f Polyester Structure of sparse part of front and back knitted fabric: 1 repeat 4 course rhombus mesh (1 in 1 out) Structure of dense part of front and back knitted fabric: 1/1 tricot type 4 course double atlas Space of sparse part of front and back knitted fabric Filling rate: 6.19% Space filling rate of dense part of front and back knitted fabric: 12.24%

<Example 2> A three-dimensional three-dimensional knitted sheet (see FIGS. 4 and 5) having the following specifications was knitted according to the knitting structure shown in FIG.

Knitting machine: Double Russell knitting machine (9 gauge /
2.54 cm, distance between kettles 15 mm) Wale density (sparse part): 19.1 pieces / 5 cm (9.7 pieces / inch) Wale density (dense part): 26.6 pieces / 5 cm (13.5)
(Coarse / inch) Course density (sparse part): 23.6 / 5 cm (12 / inch) Course density (dense part): 23.6 // 5 cm (12 / inch) Finished thickness t: 12.92 mm Table Knitting yarn of knitted fabric: 1450 dtex / 96f polyester / BCF multifilament (crimped yarn) Knitting yarn of back knitting fabric: 1450 dtex / 96f polyester / BCF multifilament (crimped yarn) Connecting yarn: 660 dtex / 1f Polyester Structure of sparse portion of front and back knitted fabric: 1 repeat 2 course rhombus mesh (1 in 1 out) Structure of dense portion of front and back knitted fabric: 1/2 tricot type 2 course double atlas Space of sparse portion of front and back knitted fabric Filling rate: 7.01% Space filling rate of the dense portion of the front and back knitted fabric: 10.74% Form in which the dense portion protrudes 3 mm outward from the sparse portion (projection height h = 3) m)

Example 3 A three-dimensional three-dimensional knitted sheet (see FIG. 6 (b)) having the following specifications was knitted according to the knitting structure shown in FIG.

Knitting machine: Double Russell knitting machine (9 gauge /
2.54 cm, distance between pots 15 mm) Wale density (sparse part): 19.7 pieces / 5 cm (10 pieces /
Inch) Wale density (dense part): 27.6 lines / 5cm (14 lines /
Inch) Course density (sparse part): 23.6 lines / 5 cm (12 lines / inch) Course density (dense part): 23.6 lines / 5 cm (12 lines / inch) Finished thickness t: 13.5 mm Knitting yarn: 1450 dtex / 96f polyester / BCF multifilament (crimped yarn) Knitting yarn for back knitting: 1450 dtex / 96f polyester / BCF multifilament (crimped yarn) Connecting yarn: 660 dtex / 1f polyester Front and back Structure of the sparse portion of the knitted fabric: 1 repeat, 2 courses rhombic mesh (1 in, 1 out) Structure of the dense portion of the front and back knitted fabric: 1/2 tricot type, 2 course double atlas Space filling rate of the sparse portion of the front and back knitted fabric : 8.41% Space filling ratio of dense part of front and back knitted fabric: 12.35% Form in which dense part protrudes outward by 1 mm from sparse part (projection height h = 1 mm)

<Comparative Example> A three-dimensional three-dimensional knitted sheet was knitted according to the following specifications (a structure without a dense portion) according to the knitting structure shown in FIG.

Knitting machine: Double Russell knitting machine (9 gauge /
2.54 cm, distance between pots 15 mm) Wale density: 15.8 threads / 5 cm (8 threads / inch) Course density: 29.5 threads / 5 cm (15 threads / inch) Finished thickness t: 11.5 mm Knitting yarn: 1450 dtex / 98f polyester / BCF multifilament (crimped yarn) Knitting yarn of the back knitted fabric: 1450 dtex / 98f polyester / BCF multifilament (crimped yarn) Connecting yarn: 660 decitex / 1f polyester Front / back knitting Ground organization: 1 repeat 4 course rhombus mesh (1 in 1 out) Space filling rate of front and back knitted fabric: 7.06%

Each of the three-dimensional three-dimensional sheets knitted as described above was evaluated by the following evaluation method. Table 1 shows the results.

<Method of Measuring Compression Ratio and Compression Restoration Ratio> A three-dimensional three-dimensional sheet was cut into a 5 × 5 cm test piece, and its initial thickness A was measured. Next, place a 5 kg weight on the test piece and
After leaving it for 0 minutes and measuring the thickness B at that time, the weight was removed and the thickness C after 10 minutes had elapsed was measured. The compression ratio and the compression restoration ratio were determined by the following formulas.

Compression rate (%) = {(AB) / A} × 100 Compression restoration rate (%) = {(CB) / (AB)} × 10
0

<Evaluation Method of Morphological Stability> A test piece having a width of 70 mm × a length of 300 mm was taken from a three-dimensional three-dimensional sheet one by one from the vertical and horizontal directions, and a urethane foam cushion was placed on a flat wear table of a testing machine. The material is placed, and the surface of the test piece is placed on the material so that the surface of the test piece is not wrinkled, and is fixed with a clamp. Next, a friction element (the bottom surface serving as a contact surface is a circular arc surface of R10) to which JIS L3102 No. 6 cotton canvas is attached is placed on the test piece. The pressing load including the friction element is 29.43.
N (3kgf), stroke 140mm, speed 60
Perform a test of 500 reciprocations at ± 10 reciprocations / minute. As a result of the test, those having no change in morphology were classified as "grade 5", those with slight change in morphology as "grade 4", those with morphological change clearly as "grade 3", Those with slightly remarkable changes were judged as “grade 2”, and those with remarkable changes in form were judged as “grade 1”.

<Evaluation Method of Pin-Up Property> A pin (tip diameter: 1.1 mm) was pierced into a dense portion of the surface knitted fabric of the three-dimensional three-dimensional sheet.
The pin fixability at that time was evaluated. If the pin can be firmly and securely fixed with sufficient tightening force, it is marked as "O", and if it is loose, the pin can be fixed and maintained as "△", and the pin could not be fixed. Indicates “×”.

<Evaluation method of anti-slip property> When a person actually sits on the three-dimensional three-dimensional sheet and applies a force to shift it in the lateral direction by the buttocks, the one in which sliding movement is extremely unlikely is indicated by “◎”, and is relatively small. When a force was applied, the one that hardly caused sliding movement was marked with “○”, and the one that easily caused sliding movement even with relatively small force was marked as “x”.

[0050]

[Table 1]

As is clear from Table 1, the three-dimensional three-dimensional knitted sheets of Examples 1 to 3 of the present invention are excellent in both the compression ratio and the compression recovery ratio, do not cause uneven buckling, and have an appropriate cushion. In addition, it has excellent form stability, and also suppresses slippage of the buttocks when seated, and has excellent anti-slip properties. In addition, since excellent pin-up properties were obtained, it could be confirmed that they were also suitable as partitions and partitions.

On the other hand, in the comparative example equivalent to the conventional product,
It was poor in form stability and excessively sunk when seated, inferior in usability, and could not fix the pin, resulting in poor pin-up. In addition, the anti-slip property was insufficient.

[0053]

The three-dimensional three-dimensional knitted sheet of the present invention is lightweight, excellent in air permeability, excellent in cushioning properties, and excellent in body pressure dispersibility. In addition, since a monofilament yarn is used as the connecting yarn, it has cushioning properties and resilience.

Further, at least the outer knitted fabric has a sparse portion knitted in a perforated structure and a space filling ratio of the sparse portion of 1.1 to 1.1.
Since it is composed of a dense part knitted with a space filling ratio of 6 times, the seat is provided with sufficient rigidity by the presence of the dense part while maintaining excellent ventilation and excellent cushioning properties by the sparse part. The flexural strength is remarkably improved, and excellent morphological stability without excessive sinking is obtained. In addition, the presence of the dense portion having excellent buckling strength results in excellent anti-slip properties. Therefore, it is suitable as a cushion sheet material for an automobile seat, a cushion sheet material for a chair, and the like, and a good pin-up property is ensured in a dense portion. Since the plate-like shape can be sufficiently maintained, and transparency is given by the sparse portion, it is also suitable as a partition or a partition. In particular, due to the presence of the dense part, it is possible to sufficiently prevent deflection without adopting reinforcement of the outer peripheral edge by the frame material,
It is excellent in that the plate-like form as a partition or a partition can be reliably held.

When the space filling ratio of the sparse portion is in the range of 2 to 30% and the space filling ratio of the dense portion is in the range of 2.2 to 40%, the air permeability and cushion characteristics are further improved. In addition, buckling strength, form stability, and pin-up properties can be further improved.

At least 1% of the connecting yarn constitutes a connecting layer having a truss structure which is obliquely shifted from the opposing stitches of the front and back knitted fabrics to a stitch separated by one or more wales and / or one or more courses. If so,
It does not cause uneven buckling due to the fall of the connecting yarn, and has excellent cushioning and restoring force without directionality.

When the surface of the dense portion is configured to protrude outward from the surface of the sparse portion, the anti-slip property can be further improved. Further, since the surface of the dense portion protrudes more than the surface of the sparse portion, rigidity is further improved by a so-called rib effect, and there is an advantage that deflection can be more effectively prevented, and thus form stability can be improved.

The arrangement density of the connecting yarns arranged in the region corresponding to the dense region of the top knitted fabric is higher than the arrangement density of the connecting yarns arranged in the region corresponding to the sparse region of the top knitted fabric. In this case, the dimensional stability of the three-dimensional knitted fabric sheet can be further improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a three-dimensional knitted fabric sheet according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line XX in FIG.

FIG. 3 is a plan view of a front knitted fabric of the three-dimensional knitted fabric sheet of FIG. 1;

FIG. 4 is a plan view of a front knitted fabric of a three-dimensional knitted fabric sheet according to another embodiment.

FIG. 5 is a sectional view taken along line YY in FIG. 4;

6 (a), (b) and (c) are schematic plan views of a knitted fabric showing a modification of the mutual arrangement of the sparse portion and the dense portion.

FIG. 7 is a knitting structure diagram of the three-dimensional knitted fabric according to the first embodiment.

FIG. 8 is a knitting structure diagram of the three-dimensional knitted fabric according to the second embodiment.

FIG. 9 is a knitting structure diagram of the three-dimensional knitted fabric according to the third embodiment.

FIG. 10 is a schematic view of the three-dimensional knitted fabric according to the first embodiment.

FIG. 11 is a schematic view of the three-dimensional knitted fabric according to the second embodiment.

FIG. 12 is a schematic view of a three-dimensional knitted fabric according to a third embodiment.

FIG. 13 is a knitting structure diagram of a three-dimensional knitted fabric according to a comparative example.

FIG. 14 is a schematic view of a three-dimensional knitted fabric according to a comparative example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Three-dimensional three-dimensional knitted fabric sheet 2 ... Front knitted fabric 3 ... Back knitted fabric 4 ... Connecting yarn 20 ... Sparse portion of surface knitted fabric 20a ... Through hole 21 ... Dense portion of surface knitted fabric 30 ... Sparse portion of back knitted fabric 30a … Through hole 31… dense part of the back knitted fabric

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Shuichi Shimadzu 1-5-8 Ohori, Matsubara-shi, Osaka Sumitomo Textile Company F-term (reference) 4L002 AA07 AB02 AB04 CA01 CA03 CA04 CB01 CB02 EA00 FA06

Claims (5)

[Claims] 1. A three-dimensional three-dimensional knitted fabric having a thickness of 3 to 35 mm in which a front knitted fabric and a back knitted fabric which are spaced apart from each other are connected by a connecting yarn made of a monofilament yarn. A knitting machine having a double-row needle bed of １８18 gauge, knitted at a density of 8 to 30 courses / 2.54 cm, and at least the outer knitted fabric is knitted into a perforated structure such as a mesh or tricot; A dense portion knitted at a space filling ratio of 1.1 to 6 times the space filling ratio of the sparse portion. In both front and back knitted fabrics, a stitch formed by the ground knitting yarn and the connecting yarn. Characterized in that the total thickness of the threads is set to 550 dtex or more. 2. The three-dimensional knitted fabric according to claim 1, wherein the space filling ratio of the sparse portion is in a range of 2 to 30%, and the space filling ratio of the dense portion is in a range of 2.2 to 40%. Sheet. 3. One or more wales and / or 1% or more of 1% or more of the connecting yarns are formed from opposing stitches of the front and back knitted fabrics.
The three-dimensional three-dimensional knitted fabric sheet according to claim 1 or 2, wherein the connecting layer has a truss structure that is obliquely shifted toward stitches separated by a plurality of courses. 4. The three-dimensional knitted fabric sheet according to claim 1, wherein the surface of the dense portion is configured to protrude outward from the surface of the sparse portion. 5. The arrangement density of the connecting yarns arranged in a region corresponding to the dense region of the surface knitted fabric is higher than the arrangement density of the connecting yarns arranged in the region corresponding to the sparse region of the surface knitted fabric. The three-dimensional knitted fabric sheet according to any one of claims 1 to 4, wherein the three-dimensional knitted fabric sheet is configured to be large.