JP5610786B2 - Industrial wipes - Google Patents

Description

  The present invention relates to an industrial wipe used for wiping dust, dirt, moisture and oil adhering to laboratories, manufacturing rooms, laboratory instruments, manufacturing instruments, products, parts and the like in various industries.

There are various factors that affect the wiping performance of industrial wipes, and the main factors that have a particularly large influence are liquid absorbency and flexibility. If the liquid absorbency is low, it becomes easy to wipe off moisture and oil adhering to the object, and if the flexibility is poor, a gap is likely to be formed between the object and unwiping is likely to occur. From such a point of view, as an industrial wipe that is extremely excellent in liquid absorbency and flexibility, there has conventionally been provided a non-woven fabric made of 100% cotton.
However, industrial wipes are also required to have less lint (fiber powder), and a 100% cotton non-woven fabric cannot meet this requirement.
As a technique for preventing the occurrence of lint, it has been proposed to laminate a plurality of base material sheets to give embossing or to bond fibers using heat-bonding fibers (for example, Patent Document 1). However, there is also a problem that flexibility is likely to be lowered and manufacturing cost is increased, which is an unfavorable solution for industrial wipes that are disposable products.

JP 2005-160654 A JP-A-2005-245913 JP 2003-116761 A JP 2002-238822 A JP 2007-314905 A

  Then, the main subject of this invention is providing the industrial wipe with few amounts of lint generation | occurrence | production, although it is excellent in liquid absorptivity and a softness | flexibility.

The present invention that has solved the above problems is as follows.
<Invention of Claim 1>
The heat fusion fiber is melted in a state where cotton fiber and heat fusion fiber are mixed,
The basis weight is 25 to 35 g / m ² , and the thickness is 300 to 320 μm.
It consists of a single layer nonwoven fabric containing cotton fibers and synthetic fibers in a mixed state and a weight ratio of 5: 5 to 7: 3,
As the synthetic fiber, non-heat-bonded fiber that is not heat-bonded to other fibers, heat-bonded to at least one of the cotton fiber and the non-heat-bonded fiber, and other fibers. A composite heat-sealing fiber having a non-exposed portion in a weight ratio of 4: 6 to 6: 4,
Industrial wipes characterized by that.

(Function and effect)
In the present invention, the amount of lint generated is drastically reduced by the synergistic effect of mixing synthetic fibers, reducing the amount of cotton fiber that is a lint generation source, and including a composite heat-sealing fiber as part of the synthetic fiber. To do. Moreover, by containing 50% or more of the cotton fibers, even if the synthetic fibers are hydrophobic, the water absorption is hardly lowered, and of course the oil absorbency is not lowered. Further, since the occurrence of lint is not suppressed only by the heat-sealing fiber, the amount of the heat-sealing fiber used is small, and the decrease in flexibility is small. As a result, it becomes a wipe in which the amount of lint generated is suppressed while sufficiently maintaining the goodness of cotton. In addition, the cotton fiber in this invention means a natural fiber, and does not include chemical fibers such as regenerated fibers and semi-synthetic fibers.

<Invention of Claim 2>
The cotton fiber has a fineness of 1.38 to 1.52 dtex and a fiber length of 20 to 30 mm.
The non-heat-bonding fiber is a polyester short fiber having a fineness of 1.38 to 1.52 dtex and a fiber length of 30 to 40 mm,
The heat-sealing fiber has a core-sheath composite heat of fineness 2.15 to 2.41 dtex, fiber length 34 to 42 mm, core is polyester, and sheath is polyethylene or copolymer polyester having a melting point lower than that of the core. A fused short fiber,
The industrial wipe of claim 1.

(Function and effect)
By using cotton fibers, non-heat-bonded fibers and heat-bonded fibers with such fineness and length, homogeneous mixing and entanglement are possible, and excellent in all of liquid absorbency, flexibility and lint suppression It becomes.

  As described above, according to the present invention, there are advantages such that the amount of lint generated is extremely reduced while being excellent in liquid absorbency and flexibility.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.
The industrial wipe of the present invention is composed of a single-layer nonwoven fabric containing cotton fibers and synthetic fibers in a mixed state and in a weight ratio of 5: 5 to 7: 3. The cotton fiber is not particularly limited as long as it is a natural fiber (that is, it does not include chemical fibers such as regenerated fiber and semi-synthetic fiber), but the fineness is 1.38 to 1.52 dtex, particularly 1.42 to 1.48 dtex. Is preferred. If the fiber is too thin, lint is likely to be generated by cutting the fiber, and if it is too thick, flexibility is reduced, which is not preferable. The fiber length of the cotton fiber is not particularly limited, but is preferably 20 to 30 mm, particularly preferably 25 to 30 mm from the viewpoint that the entanglement with other constituent fibers becomes good.

  The content ratio of the cotton fiber is 5: 5 to 7: 3 by weight ratio (cotton fiber: synthetic fiber), and particularly preferably 6: 4 to 7: 3. If the mixing ratio of the cotton fibers is too small, the liquid absorbency and flexibility are poor, and if it is too large, not only the amount of lint generated increases, but also the strength becomes unfavorable.

  Cotton fibers include degreased and non-degreased ones, and any of them can be used in the present invention, but degreased ones are preferred from the viewpoint of water absorption.

  Synthetic fibers in the industrial wipe of the present invention include non-heat-bonded fibers that are not heat-bonded to other fibers, portions that are heat-bonded to at least one of cotton fibers and non-heat-bonded fibers, and heat from other fibers. The composite heat-sealing fiber having an unfused portion is contained at a weight ratio of 4: 6 to 6: 4.

  As the polymer used for the non-heat-bonding fiber, a polyester polymer, a polyolefin polymer, a polyamide polymer, a polystyrene polymer, a polyacrylonitrile polymer, a polyvinyl alcohol polymer, or the like may be used. it can. As the polyolefin polymer, a chain olefin polymer such as polyethylene, polypropylene, and ethylene-propylene copolymer, a cycloolefin polymer, a cycloolefin copolymer, and the like can be used.

  Above all, it is easy to impregnate liquid because of its good compatibility with water and oil, and a polyvinyl alcohol copolymer that has a very soft texture when wet and excellent workability. A polyester polymer that can suppress the shrinkage of the resin and has good workability is preferable.

  The polymer used for the polyvinyl alcohol polymer is not particularly limited, and other monomers, such as α-olefins such as ethylene, carboxylic acid groups, ester groups, sulfonic acid groups, ethylene groups, silane groups, silanol groups, amine groups. In addition, it may be copolymerized with a monomer having any one or two or more functional groups such as an ammonium group. The polyvinyl alcohol-based polymer can be usually obtained by a saponification reaction of a vinyl carboxylate polymer. In this case, the degree of saponification is not particularly limited, and the degree of saponification is usually from 85 to 99.9 mol%. Preferably, 96 to 99.9 mol% is used.

  Polyester polymers include terephthalic acid, isophthalic acid, naphthalene-2,6-dicarboxylic acid, phthalic acid, α, β- (4-carboxyphenoxy) ethane, 4,4′-dicarboxydiphenyl, 5-sodium sulfo Aromatic dicarboxylic acids such as isophthalic acid or their esters, ethylene glycol, diethylene glycol, 1,4-butanediol, 1,6-hexanediol, neopentyl glycol, cyclohexane-1,4-dimethanol, polyethylene glycol, poly Examples include polyesters synthesized from diols such as tetramethylene glycol or ester-forming derivatives thereof, and polyesters obtained from hydroxycarboxylic acids such as polylactic acid and / or derivatives thereof. Phthalate, polybutylene terephthalate, such as polytrimethylene terephthalate, or 80 wt% of structural units of ethylene terephthalate units or a polyester resin is a polybutylene terephthalate units are preferred.

  As the non-heat-bonding fiber, a typical circular cross-section fiber and an atypical cross-section fiber can be used. Moreover, as the non-heat-bonding fiber, a single-component fiber or a composite fiber such as a core-sheath type, a side-by-side type, a split-fiber type, or the like composed of two or more types of resin components including a portion that is not fused by heat treatment is used. You can also. Further, the non-heat-bonding fiber may be a hydrophilic fiber or a hydrophobic fiber. In the case of a hydrophilic fiber, the raw material polymer itself has hydrophilicity and is coated with a hydrophilic agent. Also, a material obtained by kneading a hydrophilic resin into a raw material or a composite fiber having a portion made of a hydrophilic resin can be used.

  The fineness of the non-heat-bonded fiber is not particularly limited, but is preferably 1.38 to 1.52 dtex, particularly 1.42 to 1.48 dtex. If the fiber is too thin, lint is likely to be generated by cutting the fiber, and if it is too thick, flexibility is reduced, which is not preferable. Further, the fiber length of the non-heat-bonding fiber is not particularly limited, but is preferably 30 to 40 mm, particularly preferably 38 to 40 mm from the viewpoint of good confounding properties with other constituent fibers.

  On the other hand, as the composite heat-fusible fiber, a composite fiber composed of two or more kinds of resin components including a portion not fused by heat treatment is used. By not using a single component fiber, a sufficient lint suppression effect, fiber bonding, and strength improvement effect can be obtained with a small amount of heat fusion components. As the composite structure, a core-sheath type, a side-by-side type, a split fiber type, or the like can be used, and is not particularly limited, but the core-sheath type is preferable in terms of good fusion property. The difference in melting point between the fusion component and the non-fused portion is preferably 10 ° C. or more.

  Examples of the components of the heat-sealing fiber include 6 nylon / polyethylene, polypropylene / polyethylene, polypropylene / ethylene-vinyl acetate copolymer, polyester / polypropylene, polyester / polyethylene, 6 nylon / 66 nylon, high density polyester / low density. A combination of polyester and the like can be used, but is not limited thereto. In particular, as the heat-fusible fiber, a core-sheath structure in which the core is polyester and the sheath is polyethylene or copolymer polyester having a melting point lower than that of the core is preferable.

  The content of the heat-sealable fiber in the synthetic fiber is 4: 6 to 6: 4 in weight ratio (non-heat-sealable fiber: heat-sealable fiber), and particularly 4.5: 5.5-5. .5: 4.5 is preferred. If the content of the heat-fusible fiber is too small, a sufficient fiber bonding effect cannot be obtained, the lint suppression becomes insufficient and the strength also decreases, and if it is too large, the flexibility decreases, and the significance of using cotton is Since it fades, it is not preferable.

  On the other hand, as a method for producing the industrial wipe of the present invention, a known nonwoven fabric production method can be used without any particular limitation. As a method for forming the fiber web, a dry method such as a card method, an air lay method, a spun bond method, or a wet method can be selected as appropriate. The fiber web can be a random web, a semi-random web, a parallel web, a cross-wrap web, or the like. Can be appropriately selected. In particular, in the present invention, a method of forming a web by a card method or an air array method using a raw material in which cotton fibers and synthetic fibers (non-heat-bonding fibers and heat-bonding fibers) are uniformly mixed is employed. preferable.

A known method such as a spun lace method or a needle punch method can be used without particular limitation as the entanglement method of the fiber web, but the spun lace method is preferred in that it produces little lint and has a lint washing effect. When using the spunlace method, it is preferable to use a nozzle in which orifices are provided at predetermined intervals, and spray a columnar water flow over the entire nonwoven fabric to give three-dimensional entanglement between fibers. Specific treatment conditions may be determined as appropriate. For example, when the basis weight is a non-woven fabric having a basis weight of about 25 to 35 g / m ² , an orifice having a pore diameter of 0.05 to 0.5 mm is spaced by 0.3 to 1.5 mm. The columnar water flow having a water pressure of 2 to 50 MPa, particularly 5 to 50 MPa is preferably sprayed from the front and back sides of the fiber web 1 to 4 times each from a nozzle disposed at a height of 20 to 80 mm above the web.

  After being entangled by the water flow, it is dried to remove moisture. During or after the drying, the fiber web is bonded to the heat-bonded fiber so that only the heat-bonded portion of the heat-bonded fiber is melted (that is, not less than the melting point of the heat-bonded portion (component)). Heat treatment at a temperature equal to or lower than the melting point of the landing portion (component). The heat treatment method is not particularly limited, and for example, hot air treatment, thermal calendar treatment, heat embossing treatment and the like can be used. From the viewpoint that the heat-fusible fibers are uniformly melted, particularly hot air treatment or heat calender treatment. Preferably there is. The heat-sealing treatment conditions can be appropriately determined. For example, the heat-sealing fiber is a core-sheath type composite fiber of polyester (core) / low-melting point copolymer polyester (sheath) in the above-mentioned fineness and fiber length range. In some cases, for example, it is preferable to perform hot air treatment at a temperature of 120 to 140 ° C. for about 60 to 70 seconds.

The basis weight of industrial wipes of the present invention is preferably set to 25g / m ² ~35g / m ² about, but is not limited thereto. If the basis weight is too small, it is difficult to ensure liquid retention and strength, and if it is too large, it becomes too thick and difficult to hold. From the viewpoint of ease of use, the thickness is preferably about 300 to 320 μm.

  The strength of the industrial wipe of the present invention is not particularly limited, but the dry tensile strength is about 1500 to 3000 cN / 25 mm in the machine direction, 600 to 900 cN / 25 mm in the transverse direction, particularly 2300 to 3000 cN / 25 mm in the machine direction, and the transverse direction. It is preferably about 700 to 900 cN / 25 mm. The wet tensile strength is preferably about 1500 to 3000 cN / 25 mm in the longitudinal direction and about 500 to 800 cN / 25 mm in the transverse direction, particularly about 2300 to 3000 cN / 25 mm in the longitudinal direction and about 600 to 800 cN / 25 mm in the transverse direction.

  The industrial wipe of the present invention can effectively suppress lint generation without embossing, but it can also be embossed in order to improve scraping properties and strength.

  In order to confirm the effect of the present invention, as shown in Table 1, various wipe samples (dimensions: length 250 mm × width 250 mm) were produced, and tensile strength, water absorption, lint amount (dust generation amount) were measured, Evaluation was performed including flexibility.

In addition, the raw material and the manufacturing method are as follows. Conditions that are not particularly specified (for example, spunlace water pressure, drying temperature) are common to each example and are general.
Cotton fiber: Fineness of 1.38 to 1.52 dtex, fiber length of 20 to 30 mm.
Non-heat-bonding fiber: Polyethylene terephthalate fiber having a fineness of 1.45 dtex and a fiber length of 38 mm.
Heat-sealing fiber: core-sheath type composite fiber having a fineness of 2.28 dtex, a fiber length of 38 mm, and a component of polyester (core) / low-melting point copolymer polyester (sheath).
Fiber web forming method: card method.
Fiber web form: random web.
Confounding method: Spunlace method.
Drying and heat fusion method: hot air treatment. In the sample containing the heat fusion fiber, the heat fusion fiber was sufficiently fused simultaneously with the drying of the fiber web.

The details of the evaluation method are as follows.
<Dry tensile strength>
It was a measured value [cN / 25 mm] measured according to JIS P 8113, and the longitudinal direction (direction parallel to the fiber orientation) and the lateral direction (direction perpendicular to the fiber orientation) were measured. When the measured value is 2300 in the vertical direction and over 700 in the horizontal direction, ◯ is used for the 1500 to 2300 vertical and 600 to 700 in the horizontal direction, △ is used for 1000 to 1500 and 500 to 600 in the vertical direction, and 1000 in the vertical direction. The case where the width was less than 500 was evaluated as x.

<Wet tensile strength>
It was a measured value [cN / 25 mm] measured according to JIS P 8135, and the longitudinal direction (direction parallel to the fiber orientation) and the lateral direction (direction perpendicular to the fiber orientation) were measured. When the measured value is 2300 in the vertical direction and over 600 in the horizontal direction, ◎ is used for the vertical 1500 to 2300 and 500 to 600 in the horizontal direction, and △ is used in the case of 1000 to 1500 and 400 to 500 in the vertical direction. The case where the width was less than 400 was taken as x.

<Water absorption>
The sample was cut into a length of 100 mm and a width of 100 mm, taken out with water for 3 minutes in a state where the front and back surfaces were alternately stacked, measured for weight after being left on a net-like horizontal table for 30 seconds, This is a calculated value [g / m ² ] obtained by calculating the increased weight. In addition, the case where the measured value was over 600 was rated as ◎, the case where it was 400 to 600 as ◯, the case where it was 300 to 400 as Δ, and the case where it was less than 300 as ×.

<Lint amount>
It is a measured value [number / sec] measured in accordance with JIS B 9923, and the number of particles having a particle size of 0.3 to 25 μm was measured for a sample of 250 mm × 250 mm.
In addition, the case where the measured value was less than 500 was evaluated as “◎”, the case where it was 500 to 1000 was evaluated as “◯”, the case where it was 1000 to 1500 was determined as “Δ”, and the case where it was over 1500 was evaluated as “X”.

<Flexibility>
It is a sensory evaluation, and as a result of touching by the tester with the hand, ◎ indicates that it is extremely flexible and can be wiped close to the unevenness of the surface of the object without gaps. ◯ indicates that the surface of the object can be wiped without gaps, and △ indicates that the surface of the object is not flexible enough to follow the unevenness of the object surface. Those that were considered to be inferior in adhesion were marked with x.

  As shown in Table 1, the samples included in the scope of the present invention did not lose water absorption and flexibility, and had high strength, although the amount of lint was remarkably small.

  INDUSTRIAL APPLICABILITY The present invention can be used for industrial wipes used for wiping dust, dirt, moisture, and oil adhering to laboratories, manufacturing rooms, laboratory instruments, manufacturing instruments, products, parts and the like in various industries.

Claims (2)

The heat fusion fiber is melted in a state where cotton fiber and heat fusion fiber are mixed,
The basis weight is 25 to 35 g / m ² , and the thickness is 300 to 320 μm.
It consists of a single layer nonwoven fabric containing cotton fibers and synthetic fibers in a mixed state and a weight ratio of 5: 5 to 7: 3,
As the synthetic fiber, non-heat-bonded fiber that is not heat-bonded to other fibers, heat-bonded to at least one of the cotton fiber and the non-heat-bonded fiber, and other fibers. A composite heat-sealing fiber having a non-exposed portion in a weight ratio of 4: 6 to 6: 4,
Industrial wipes characterized by that. The cotton fiber has a fineness of 1.38 to 1.52 dtex and a fiber length of 20 to 30 mm.
The non-heat-bonding fiber is a polyester short fiber having a fineness of 1.38 to 1.52 dtex and a fiber length of 30 to 40 mm,
The heat-sealing fiber has a core-sheath composite heat of fineness 2.15 to 2.41 dtex, fiber length 34 to 42 mm, core is polyester, and sheath is polyethylene or copolymer polyester having a melting point lower than that of the core. A fused short fiber,
The industrial wipe of claim 1.