JP2992297B2 - Woven fabric for cleaning - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a cleaning knitted fabric excellent in cleanability and durability.

[Conventional technology and problems to be solved]

The wiper used for cleaning has a dust-absorbing property to absorb dust, a dust-retaining property to capture sucked dust, oil for cleaning,
It is necessary to be excellent in liquid absorbing property for absorbing a solvent and liquid-retaining property for trapping absorbed water, etc., and also excellent in durability.

However, conventional wipers generally use paper or fabric as a material, and since most of these materials are made of short fibers such as polyester and cellulose, the short fibers are relatively easily frayed by external force. In addition, the fibers tended to fall off easily and generate dust due to repeated sliding operation when used as a wiper. For this reason, in an environment that dislikes dust, for example, in a manufacturing site of an electronic product, the above-mentioned conventional cleaning cloth generates lint and cannot be completely cleaned.

To compensate for these drawbacks, woven or knitted fabrics made of synthetic fibers are used for cleaning. Generally, the greater the surface area per gram of fiber (hereinafter simply referred to as surface area), the greater the cleaning power. One way to increase the surface area is to thin the single yarn. For example, as shown in JP-B-59-30419, a method in which a splittable conjugate fiber composed of a hydrophilic and a lipophilic polymer is once made into a woven fabric, and one side component is subjected to a splitting treatment with a solvent to make a single yarn thin. However, there is a problem in that the production of such a fabric involves a solvent treatment step and increases running costs. In addition, because of the combination of the hydrophilic polymer and the lipophilic polymer, the cleaning power of the oily stain was inferior to the case of using only the lipophilic polymer. The present invention is to provide a cleaning woven or knitted fabric which has solved the conventional problems.

[Means for solving the problem]

The present invention relates to a cleaning knitting fabric comprising a porous polyolefin fiber having a porosity of 20 to 80% and having a lamella structure and a space surrounded by a large number of fibrils connecting the lamella structure communicating from the fiber surface to the center portion. It is a woven fabric.

Examples of the porous polyolefin fibers used in the present invention include the fibers described in Japanese Patent Application No. 63-158957 previously filed by the present applicant.

Further, as the polymer used in the present invention, polyethylene, polypropylene, poly-3-methylbutene-1,
Examples include lipophilic and highly crystalline polyolefins such as poly-4-methylpentene-1.

The method for producing the porous polyolefin fiber of the present invention will be described. First, polyolefin is melt-spun using an ordinary spinneret to obtain an undrawn yarn.

The spinning temperature suitable for obtaining a porous structure having a porosity of 20 to 80%, which is the object of the present invention, is set to a temperature range of about 20 ° C. or more above the melting point of the polymer and not exceeding about 80 ° C. or more. Is preferred. The undrawn yarn spun in a low temperature region not exceeding about 20 ° C. or more from the melting point of the polymer has a very high degree of oriented crystallization. Magnification becomes low, and the porous fiber intended by the present invention is difficult to obtain. Conversely, if the fiber is spun in a high temperature region exceeding the melting point of the polymer by 80 ° C. or more, the porosity is greatly reduced. The polymer discharged at an appropriate spinning temperature is preferably collected in a draft in the range of 10 to 10,000.

The undrawn yarn thus obtained may be drawn as it is, or may be subjected to an annealing treatment for 2 minutes or more at a fixed length or a relaxed state at a temperature lower than the melting point of the polymer.

The drawing may be performed in one step, but in order to obtain a porous fiber having a high porosity, two-step drawing in which high-temperature drawing is performed subsequently to low-temperature drawing is desirable.

In order to reduce the dry heat shrinkage of the obtained porous fiber, the fiber may be heat-set at a temperature lower than the melting point, if necessary, under tension or in a relaxed state.

The desired cleaning knitted fabric is obtained by weaving or knitting the porous polyolefin fiber obtained in this manner by an appropriate method.

Hereinafter, the present invention will be described more specifically with reference to examples. The various measured values in the examples were measured by the following methods.

(1) Lint-free performance Using a device shown in 5.11 of JIS L-1085, 1
The two test pieces of 10 cm square and 400 cc of ethanol were put into the container of No. 1 and shaken for 20 minutes. Then, the ethanol was passed through black paper, and the weight of the passed lint was measured.

(2) Wipeability Carbon black powder with a particle size of about 1μ as dust,
Each was sprayed on an acrylic plate using water and kerosene, and the evaluation was made based on the size of the wiping residue when actually wiping.

(3) Oil retention The weight increase after immersion in salad oil and centrifugal deoiling at 1000 rpm was measured and expressed as% by weight relative to the fabric.

Example 1 High-density polyethylene having a density of 0.968 g / cm ³ and a melt index of 5.5 was discharged using a nozzle having a nozzle diameter of 1.0 mmφ and a number of holes of 25, a discharge amount of 25 g / min, a spinning temperature of 180 ° C., and a winding speed of 60.
It was wound up under the condition of 0m / min. After the obtained undrawn yarn is wound around a bobbin and heat-treated at 115 ° C for 12 hours, it is cold-drawn at room temperature by a twisting machine at 60%, and then hot-drawn at 110 ° C so that the drawn amount becomes 230%. Was done. In addition, the stretching amount is 2
A relaxation heat set was performed at 120 ° C. to 13%. The film was wound around a pan at a stretching speed of 250 m / min and a spindle rotation speed of 10,000 rpm.

The obtained porous polyethylene fiber had a porosity of 59% and a fineness of 120 denier / 40 filament.

The porous fibers were twisted at a twist number of 150 T / M and warped, and then woven into a twill weave with rapier fibers at both a warp density and a weft density of 50 yarns / inch.

 Table 1 shows the evaluation results of the cleaning power of the woven fabric.

[Comparative Example 1] A high-density polyethylene having a density of 0.958 g / cm ³ and a melt index of 20 was discharged using a nozzle having a nozzle diameter of 0.6 mmφ and a number of holes of 15 g / min, a spinning temperature of 170 ° C, and a winding speed of 800 m /. m
Winded up in the condition of in. The obtained undrawn yarn was subjected to single-stage drawing at 80 ° C. by a twisting machine so that the drawn amount became 322%, and further heat set at 110 ° C. with a roller. Stretching speed is 250m /
At min, the spindle was wound at 10,000 rpm.

The obtained polyethylene fiber was smooth and had a fineness of 40 denier / 40 filament.

The fiber was twisted at a twist number of 150 T / M and warped, and then woven into a twill weave with rapier fibers under the same conditions as in Example 1.

 Table 1 also shows the evaluation results of the cleaning power of the woven fabric.

Comparative Example 2 Table 1 also shows various evaluation results of a nonwoven fabric having a basis weight of 92 g / cm ³ formed from polyester fibers having a weave of 0.2 denier.

〔The invention's effect〕

The woven or knitted fabric made of the porous polyolefin fiber of the present invention is extremely excellent in cleaning power for machine oil, solvent, and the like, and is suitable for use in an environment where dust is not desirable, for example, in a manufacturing site of an electronic product.

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-50-135328 (JP, A) JP-A-63-152445 (JP, A) JP-A-2-133607 (JP, A) JP-A-2- 91241 (JP, A) JP-A-2-14011 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) A47L 13/16 D01F 6/04 D01F 6/46 D03D 15/00

Claims (1)

(57) [Claims] 1. A cleaning member comprising a porous polyolefin fiber having a porosity of 20 to 80% and having a lamella structure and a space surrounded by a plurality of fibrils connecting the lamella structure communicating from the fiber surface to the center. Knitted fabric.