JPH06341031A - Cloth for pool cover - Google Patents

Abstract

PURPOSE:To provide cloth having high tear resistance and abrasion resistance, light weight, excellent handleability and low air-permeability and suitable as a pool cover. CONSTITUTION:The cloth for pool cover contains polyester fiber as main constituent fiber. The cloth has a cloth weight of <=100g/m<2>, a breaking strength of >=50kg/5cm, a tear strength of >=5.0kg and an air-permeability of <=0.1mL/ cm<2>/sec.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a cloth for a pool cover. More specifically, the present invention relates to a fabric which includes a woven fabric formed mainly of polyester fibers, is lightweight, has excellent handleability, has good tear resistance and abrasion resistance, has low air permeability, and is suitable for a pool cover.

[0002]

2. Description of the Related Art In recent years, the tendency to enjoy sports has increased due to the increase in leisure time. The contents have been diversified, and recently there is a strong interest in aerobics and fitness sports, especially in health-oriented ones. As a sport without impact,
Interest in swimming is increasing.

Generally, a hot water pool is covered with a pool cover after use to prevent dew condensation in the room and to prevent the water temperature from decreasing.
Conventionally, a waterproof cloth represented by a blue sheet for construction is used as the cloth for the pool cover. However, the pool cover using the heavy cloth for waterproofing as a base cloth has a heavy weight and thus has poor handleability, and since it is originally a sheet for construction, it has a bad appearance and poor design.

On the other hand, the fabric material obtained by using the polyester fiber is satisfactory in weather resistance, dimensional stability, chemical resistance, especially chlorine resistance, but is lightweight and has mechanical and frictional properties at the same time. This is not satisfactory, and improvement in this respect is desired for the fabric for pool covers.

[0005]

SUMMARY OF THE INVENTION The present invention has been made on the basis of the above-mentioned prior art, and its object is to have light weight, tear resistance and abrasion resistance in addition to weather resistance, dimensional stability and chemical resistance. An object of the present invention is to provide a fabric for a pool cover that has excellent properties and is beautiful in appearance.

[0006]

Means for Solving the Problems As a result of intensive studies for achieving the above object, the present inventors have found that a woven fabric composed of polyester fibers having specific strength and elongation characteristics and single fiber fineness is thermoplastic. The present inventors have found that the cloth coated with a resin film simultaneously satisfies the above-mentioned required properties, has good airtightness, and has an effect of preventing indoor dew condensation and a decrease in water temperature.

That is, the present invention comprises a woven fabric containing polyester fibers as main constituent fibers, and comprises the following (1) to
A fabric for a pool cover, which satisfies (4). (1) Fabric weight (g / m ² ) ≦ 100 (2) Breaking strength (kg / 5 cm) ≧ 50 (3) Tear strength (kg) ≧ 5.0 (4) Breathability (ml / cm ² / sec) ≦ 0.1 Further, in the above-mentioned pool cover cloth, it is preferable that the polyester fibers satisfy the following (5) to (8). (5) 0.95 ≧ [η] F ≧ 0.70 (6) 5.0 ≧ DPF ≧ 2.0 (7) ST ≧ 6.0 (8) EL ≧ 20.0 [where the above formula (5 ) To (8), [η] F represents the intrinsic viscosity of the polyester fiber, DPF represents the single fiber fineness (denier) of the polyester fiber, and ST
Represents the breaking strength (g / de) of the polyester fiber, and EL represents the breaking elongation (%) of the polyester fiber. It is preferable that the woven fabric is composed of a main constituent yarn and a woven fabric reinforcing fine-thickness yarn, and the fineness yarn has a fineness of at least twice the fineness of the main constituent yarn.

The cloth for the pool cover of the present invention is formed by using a woven fabric whose main constituent fibers are polyester fibers. This is polyester fiber, nylon-6,
This is because it is more excellent in dimensional stability and durability against sunlight and water than other synthetic fibers such as No. 6 and the like.

The content of the polyester fiber in the fabric for fabric of the present invention is 70 to 100% by weight based on the total amount of the fabric.
Is preferable, and more preferably 80 to 100% by weight. If the content of polyester fibers is less than 70% by weight, the resulting fabric may have insufficient weather resistance, chemical resistance and dimensional stability.

The polyester used in the present invention is a polymer containing 90 mol% or more, preferably 95 mol% or more, of ethylene terephthalate repeating units in its molecular chain, and among them, polyethylene terephthalate is preferable. That is, the polyester used in the present invention may contain less than 10 mol%, preferably less than 5 mol%, of another repeating unit, and as a copolymerization component forming such another repeating unit, Examples thereof include isophthalic acid, naphthalenedicarboxylic acid, adipic acid, oxybenzoic acid, diethylene glycol, propylene glycol, trimellitic acid and pentaerythritol. In addition, the polyester fiber used in the present invention may contain additives such as a stabilizer, a colorant, and an antistatic agent.

The weight (unit weight) of the pool cover fabric of the present invention must be 100 g / m ² or less. That is, the pool cover has a vast area to cover the entire surface of the pool. Therefore, prepare when the fabric weight becomes heavy,
This is because it is a heavy burden when storing and spreading it on the water surface.

On the other hand, if the weight of the cloth is reduced, that is, if the cloth is made thin and the basis weight is improved, the workability is improved, but the tear strength of the cloth is lowered, and the cloth is pulled and spread on the water surface, or when the water surface is stored. Due to the resistance received, excessive tension is applied and the fabric is torn. Therefore, the breaking strength of the cloth is required to be 50 kg / 5 cm or more and the tear strength is required to be 5 kg or more. That is, the breaking strength is 50 kg / 5c
If it is less than m, tearing may occur due to the load received by the water surface resistance when the cloth is spread on the pool. Further, since the work is pulled by hand during the work, the force is not applied to the fabric on average, and the stress is concentrated on both ends of the fabric,
If the tear strength is 5 kg or less, tearing may occur at once.

Further, the fabric of the present invention has a breathability of 0.1 m.
It should be 1 / cm ² / sec or less. If the air permeability exceeds 0.1 ml / cm ² / sec, the vaporization of water vapor from the hot water cannot be sufficiently suppressed, which causes dew condensation in the room and lowers the water temperature.

The cloth of the present invention has the following relational expressions (1) to (1).
As long as all of (4) are satisfied at the same time, resin processing may or may not be performed. However, when resin processing is applied, the above relational expressions (1) to (4)
It is preferable because all of the above can be satisfied at the same time. Examples of preferable resins include polyurethane resins, silicone resins, polyvinyl chloride resins, and the like, and it is preferable that all are selected from those having excellent flexibility and durability.

The cloth for a pool cover of the present invention comprises a woven fabric composed of a warp group and a weft group having the polyester fiber as a main constituent fiber, and the polyester fiber has the following relational expression (5). It is preferable that all of (8) to (8) are satisfied. (5) 0.95 ≧ [η] F ≧ 0.70 (6) 5.0 ≧ DPF ≧ 2.0 (7) ST ≧ 6.0 (8) EL ≧ 20.0 [where the above formula (5 ) To (8), [η] F represents the intrinsic viscosity of the polyester fiber, DPF represents the single fiber fineness (denier) of the polyester fiber, and ST
Represents the breaking strength (g / de) of the polyester fiber, and EL represents the breaking elongation (%) of the polyester fiber. ] That is, the intrinsic viscosity of the polyester fiber [η] F
Is an important factor that affects the strength and elongation characteristics (toughness) and tear resistance, and the range is 0.70 or more and 0.95.
It is particularly preferable that it is 0.80 or more and 0.95 or less. When [η] F is less than 0.70, not only it becomes difficult to simultaneously satisfy the breaking strength and elongation of the polyester fiber, but also the tear resistance becomes insufficient. On the other hand, [η] F
When the value exceeds 0.95, the spinnability is greatly reduced, and it becomes difficult to obtain a yarn without defects such as yarn fluff and yarn breakage.

Further, the monofilament fineness (DPF) is 5 denier although the monofilament strength becomes large when the monofilament fineness is large and the tearing of the cloth (fabric) is less likely to occur even if stress is concentrated on the monofilaments. If it gets thicker than that, the fabric becomes coarse and hard,
In addition, the rigidity of the yarn itself becomes high, making it difficult to weave into a high-density woven fabric to obtain airtightness, and even when weaving at the same density, airtightness is higher than that of a product with a small single fiber fineness. Since it becomes low, it becomes difficult to obtain the desired airtightness. On the other hand, if the denier is less than 2 denier, the strength of the single fiber itself becomes small and the fabric is liable to be broken, and when pulling up the pool cover, fluff is easily generated due to abrasion by the edge of the pool, which is a factor of tearing of the fabric. . Therefore, the DPF is preferably 2.0 denier or more and 5.0 denier or less.

Next, the breaking strength and elongation of the polyester fiber used in the present invention are 6.0 g / d or more and 20%, respectively.
The above is desirable. Generally, when the strength of polyester fiber is high, the elongation tends to be low. However, even if the strength is high, if the elongation is low at less than 20%, the risk of lowering the tear strength increases. . On the other hand, when the strength is less than 6.0 g / d, the strength is originally insufficient, and it is easy to break. Therefore, it is preferable that both characteristics are satisfied at the same time, and especially the strength is 6.5 g / d.
As described above, the elongation is preferably 25% or more.

From the viewpoint of the finish of the obtained woven fabric and the densification of the woven fabric by shrinkage, the boiling water shrinkage of the polyester fiber is preferably in the range of 3 to 15%.

A woven fabric mainly composed of polyester fibers having the characteristics described above is suitable as a woven fabric for a pool cover. This is because the above-mentioned characteristics are sufficiently opposed to the tensile stress and the friction with the pool edge which are received at the time of laying or storing, and improve the tear resistance thereof, and the high dimensional stability of polyester fiber, water, chlorine, etc. This is because it is possible to fully utilize various characteristics such as durability against, and excellent lightness, which is important for handling.

In the present invention, the woven fabric containing the above polyester fiber as a main constituent fiber comprises a main constituent yarn and a large fineness yarn for fabric reinforcement, and the fineness of the large fineness yarn is equal to that of the main constituent yarn. It is preferable that the fineness is at least twice the fineness. Furthermore, the woven fabric has two large fineness yarns, and
It is preferable to include a lattice-like reinforcing structure composed of warp and weft yarn groups consisting of 2 to 5 main yarns arranged between the high-fineness yarns of the book.

Here, the high-definition yarns are the same as the main constituent yarns.
It may be a combination of more than one yarn, and such a high-fineness yarn is used as a reinforcing material for a woven fabric, and exhibits a remarkable effect on the deformation and tearing of the woven fabric. When the fineness of the high-fineness yarn is less than twice the fineness of the main constituent yarn, the reinforcing effect of the high-fineness yarn becomes insufficient.

When the number of main constituent yarns arranged between the two high-definition yarns is less than 2, the two high-fineness yarns use the composite yarns. Behaves as if
Therefore, the flexibility of the obtained woven fabric is reduced, and the tear resistance of the pool cover fabric made from this woven fabric is reduced. Further, when the number of main constituent yarns arranged between the two high-definition yarns is more than 5, the interval between the two high-fineness yarns becomes too large. The mutual cooperation of the strips is reduced, which reduces their reinforcing effect on the fabric.

In the polyester fiber woven fabric used in the present invention, the weight ratio of the high-definition yarns to the total yarns is 5
It is preferably -50%, and when it is less than 5%, the effect of reinforcing the fabric by the yarns of large fineness becomes insufficient, and when it is more than 50%, the texture and appearance of the obtained fabric are improved. It may become defective.

Next, as a preferable method for producing the polyester fiber preferably used in the present invention, for example, a polyester chip having an intrinsic viscosity [η] C of 0.8 to 1.05 is melted and the polymer is discharged from the die. When melt-extruding and spinning, the zone immediately heated under the spinneret was used to cool the fibrous polymer melt flow through this zone, and the unstretched fiber obtained after applying the oil agent was taken up by a roller. Examples of the method include a method of winding via a fiber and then stretching this, or a method of immediately stretching the fiber drawn by a take-up roller in the above method without winding. The stretching process in the former method will be specifically described with reference to FIG.

In FIG. 1, an unstretched polyester multifilament 1 is supplied to a feed roller 2 pressed by a nip roller, and the feed roller 2 and a heating roller 3 heated to a temperature higher than the glass transition point of the filament. While heating the heating roller 3 while applying a slight stretch between the roller 3 and the roller 4,
In between, the polyester fiber is stretched while being heat-treated by a heating body such as a hot plate heated above the crystallization temperature of the polyester fiber. This drawn filament is obtained by heat-treating the filament between the roller 4 and the roller 6 by the heating body 7 under relaxing conditions.

[0026]

The present invention will be described in more detail with reference to the following examples. In the following examples, the strength, tear strength, air permeability, intrinsic viscosity of polymer, and breaking strength / elongation of fiber were measured by the following methods.

(Fracture Strength of Fabric) The fracture strength of the fabric is JI.
It was measured by SL-1096-79-6.12.1 (cut strip method).

That is, 5 cm × 25 cm from the cloth sample
3 pieces of each of the test pieces in the vertical direction and the horizontal direction are collected, and an Instron type tensile tester having a clamp with a width of 5 cm or more is used, and the distance between the grips of the test pieces is 10 cm, and the tensile speed is 10 cm / min. The measurement was performed to determine the strength at break.

(Tear strength) JIS L-1096-79
-6.15.2 Measured by the single tongue method. That is, a test piece of 10 cm × 20 cm is sampled from a cloth sample in the vertical direction and 5 pieces in the horizontal direction, and 5 cm at a right angle at the center of both grips of the test piece using an Instron type measuring instrument.
Make a cut and measure at a pulling speed of 10 cm / min,
Record on recording paper.

The maximum and minimum values were removed from the recorded data and the values at the second, third and fourth positions were averaged.

(Breathability) JIS L-1096-79-
6.27 Air permeability According to the A method, it was measured using a Frazier type airflow meter.

(Cloth fluff, breakage) The operation of covering the entire surface of a 20 m × 25 m pool with a cloth for a pool cover, and then raising and storing it was repeated 20 times. After repeating this 20 times, the fluff and breakage of the fabric caused by the stress received by the edge of the pool and the resistance of water were visually evaluated as follows.

[0033]

[Table 1]

(Workability) Six course ropes were put in a pool of 20 m × 25 m, and the pool cover was extended by pulling above the water from the poolside, and the load at that time was evaluated. ○: Light and easy to operate when unfolding. ×: Heavy and poor operability when unfolding.

(Appearance) The appearance of the cloth spread on the pool was visually evaluated. ○: Good ×: Rough feeling (intrinsic viscosity) Using o-chlorophenol as a solvent, 35 ° C
It was measured at a temperature of.

(SS curve) Using an Instron type measuring device, measurement is carried out at a sample length of 20 cm and a pulling speed of 10 cm / min, and recording is carried out on an appropriate recording paper. Read the required characteristics from the recorded SS curve. When setting the sample in the Instron type measuring instrument, the load is set to 0.1 g / d at the lower end of the sample so that the thread is not loosened. Breaking strength is the value obtained by dividing the strength at break by denier (g / de)
The elongation at break is the elongation at break (%). This measurement was performed 5 times and the average value was calculated.

[0037]

Example 1 A 40 de polyester multifilament yarn having the denier, intrinsic viscosity, single fiber fineness, breaking strength and breaking elongation shown in Table 2 was used to produce a woven fabric having the following structure. Texture; plain weave weave density; warp 110 / 2.54 cm, weft 110 /
A 2.54 cm unit structure is obtained by sequentially arranging 20 polyester 40 multi-filament yarns of 40 denier in both warp and weft directions.
Next, one thick yarn obtained by combining three 40 denier polyester multifilament yarns is arranged, then two 40 denier polyester multifilament yarns are arranged, and then the above It was an array of one thick yarn obtained by combining three yarns.

The woven fabric obtained was subjected to scouring, presetting, and dyeing steps by a conventional method, and then subjected to heat treatment under predetermined conditions. 5 g / m of silicone resin on the resulting fabric
Coated with a unit weight of ² . The characteristics of the obtained fabric material are shown in Table 2.

[0039]

[Table 2]

As shown in Table 2, those within the scope of the present invention are extremely useful as fabrics for pool covers.

[0041]

[Embodiment 2] No. 2 in Embodiment 1. Using the polyester fiber of No. 2, the fabric shown in Table 3 below was prepared. That is, 110 denier polyester multifilaments were struck per 2.54 cm, and the repeating units of the weave structure of the warp and weft were as shown in Table 3. The obtained woven fabric was evaluated as a fabric for a pool cover in the same manner as in Example 1. The results are shown in Table 4.

At this time, the fabric weight is 54 g / m ²
Met.

[0043]

[Table 3]

[0044]

[Table 4]

As is clear from Table 4, the fabric within the range specified in the present invention is useful as a pool cover. Further, it is understood that, in the woven structure of the woven fabric, the use of the reinforcing fine-thickness yarn improves the breaking strength and tearing strength of the cloth and reduces the breaking.

[0046]

Example 4 In order to change the basis weight of the fabric, the polyester multifilament yarn constituting the fabric was changed in fineness and weaving density.

As the unit structure, polyester multifilament yarn of each denier and three thick yarns are arranged in the same manner as in Example 1, and the obtained woven fabric is subjected to scouring, presetting, dyeing and heat treatment by a conventional method. Further, a silicone resin was coated with a basis weight of 5 g / m ² . The characteristics of the obtained fabric material are shown in Table 5.

[0048]

[Table 5]

[Brief description of drawings]

FIG. 1 is a schematic diagram of one process for producing the polyester fiber used in the present invention.

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Claims (4)

[Claims] 1. A pool cover cloth comprising a woven fabric containing polyester fibers as main constituent fibers and satisfying the following (1) to (4). (1) Fabric weight (g / m ² ) ≦ 100 (2) Breaking strength (kg / 5 cm) ≧ 50 (3) Tear strength (kg) ≧ 5.0 (4) Breathability (ml / cm ² / sec) ≤0.1 2. The polyester fiber has the following (5) to
The fabric for a pool cover according to claim 1, which satisfies (8). (5) 0.95 ≧ [η] F ≧ 0.70 (6) 5.0 ≧ DPF ≧ 2.0 (7) ST ≧ 6.0 (8) EL ≧ 20.0 [where the above formula (5 ) To (8), [η] F represents the intrinsic viscosity of the polyester fiber, DPF represents the single fiber fineness (denier) of the polyester fiber, and ST
Represents the breaking strength (g / de) of the polyester fiber, and EL represents the breaking elongation (%) of the polyester fiber. ] 3. The woven fabric comprises a main constituent yarn and a woven fabric reinforcing fine-thickness yarn, and the fineness yarn has a fineness of at least twice the fineness of the main constituent yarn. Cloth for pool cover. 4. A warp yarn group and a weft yarn having a woven fabric structure comprising two high-definition yarns and 2 to 5 main constituent yarns arranged between the two high-fineness yarns. The fabric for a pool cover according to claim 3, comprising a lattice-like reinforcing structure composed of strips.