JP4641340B2 - Wiper base fabric and manufacturing method thereof - Google Patents

Description

【００１１】
［測定方法］
・湿潤強度
精製水で湿潤させ、テンシロン引張試験機にて測定。サンプルは２５ｍｍ幅、引張速度は３００ｍｍ/ｍｉｎ、表中の数値は縦強度に横強度を乗じたものの平方根。
・保水量測定方法
７５ｍｍ×７５ｍｍの試験片を水に２分間浸漬後、飽和状態下で３０分間水切りし、重量を測定する。水切りにはペーパータオルを３ｍｍ×３８ｍｍにカットして使用する。図１のように、水を張った密閉容器内に３０分間吊り下げる。
・保油量測定方法
日石機械油（ＦＢＫ−１００）を用い、保水量の測定と同様の手順で行う。
・拭取率測定方法
平滑なステンレスプレート上に日石機械油（ＦＢＫ−１００）を３０ｍｇ滴下し、これを９ｇ/ｃｍ^２の加重下に３６ｃｍ^２のシートで拭き取ったときの除去率。
・発塵量測定方法
２０ｃｍ四方のシートを手で３０秒間揉みながら雰囲気を吸引し、１立方フィート中に含まれる直径０．３μｍ以上の大きさのリント数をパーティクルカウンターによって計数する。表中の数値はシート１ｍ^２当りに換算したもの。
【００１２】
【発明の効果】
表より明らかなように、本発明のワイパー基布は、性能が優秀であるといわれる親水処理を施したＰＰメルトブローンワイパーに比べて湿潤強度は劣るものの（坪量の違いもある）、保水量と保油量においては遜色がない。拭取率もパルプワイパーよりは格段に高く、ＰＰメルトブローンワイパーに近い値を示している。発塵率はパルプワイパーより著しく少なく、親水処理を施したＰＰメルトブローンワイパーのように処理剤の溶出も起こさない。このような高性能のワイパー基布が低コストで製造可能であり、該製品のもつ工業的意義は大きい。
【図面の簡単な説明】
【図１】 保水量の測定における飽和状態下での水切りを示す模式図である。
【符号の説明】
１………試験片
２………水切り
３………水
４………蓋
５………吊り下げ具[0001]
BACKGROUND OF THE INVENTION
The present invention provides a wiper base fabric that is excellent in liquid absorption and wiping properties and can be produced at low cost by bonding a meltblown nonwoven fabric and a pulp sheet with a heat embossing roll.
[0002]
[Prior art]
Melt blown non-woven cloth has characteristics such as excellent wiping performance because it is composed of microfibers, low dust generation because it is composed of continuous fibers, and excellent oil retention because it uses hydrophobic resin as a raw material. It is known as an excellent wiper base fabric, but since it uses a hydrophobic resin as a raw material, it does not absorb water as it is, and requires hydrophilic treatment to impart water absorption. Dissolution is a problem, and there are drawbacks such as high cost.
[0003]
On the other hand, pulp sheet is also known as an excellent wiper base fabric because of its excellent water absorption and low cost. However, it has disadvantages such as low wet strength and high dust generation. is there.
[0004]
[Problems to be solved by the invention]
The present invention makes it possible to produce a high-performance wiper base fabric that complements each other's disadvantages at a low cost by combining the advantages of both. That is, high water absorption and reduced raw material costs are achieved by laminating pulp sheets, and excellent wiping performance, high wet strength, and low dust generation are achieved by laminating meltblown nonwoven fabrics. Moreover, since it is heat bonding with a heat embossing roll, troubles due to elution of the binder do not occur during the wiping operation.
[0005]
[Means for Solving the Problems]
Wiper base fabric of the present invention, basis weight 5 to 100 g / ^{m 2} of softwood pulp, hardwood pulp, hemp, or a pulp sheet made of any of the recycled paper pulp, basis weight 3~100g / m not subjected to hydrophilic treatment the ^second melt blown nonwoven laminated two or more layers, it is thermally adhered by heat embossing roll, the meltblown nonwoven on both sides of the pulp sheet is characterized in that it is laminated. The component composition ratio of the wiper base fabric of the present invention is a pulp sheet of 5 to 95 wt% and a non-woven fabric sheet of 95 to 5 wt%, preferably a three-layer structure of non-woven fabric sheet / pulp sheet / non-woven fabric sheet, It is good to comprise 90 wt% and non-woven cloth sheet 60-10 wt%. The heat bonding is performed by a heat embossing roll, and the fused portion is 2 to 50%, preferably 5 to 30% with respect to the sheet surface area.
[0006]
The pulp sheet used for the wiper base fabric of the present invention has a basis weight of 5 to 100 g / m ² . As raw materials, softwood pulp, hardwood pulp, hemp, recycled paper pulp and the like can be used. Moreover, you may mix | blend a heat sealing | fusion fiber for the purpose of strengthening heat bonding more.
[0007]
Meltblown nonwoven used for wiper base fabric of the present invention is directed to a basis weight 3~100g / ^{m 2.} As a raw material, various resins such as polypropylene and polyester can be used, but polypropylene which is inexpensive and has a relatively low melting point is preferable. Depending on the purpose, those subjected to hydrophilic treatment can also be used.
The bonding method is thermal bonding with a heat embossing roll that is simple and low-cost and does not use a binder or the like. The fused part by thermal bonding is 2 to 50%, preferably 5 to 30%, with respect to the sheet surface area. If the fusion part is less than 5%, sufficient adhesive strength cannot be obtained, and if it is more than 30%, the water absorption performance is hindered by the fusion part.
[0008]
【Example】
Examples will be described below, but the present invention is not limited thereto.
[0009]
<Example 1>
A wiper base fabric having a three-layer structure of melt blown nonwoven fabric 15 g / m ² / pulp sheet 45 g / m ² / melt blown nonwoven fabric 15 g / m ² was prepared. 100% polypropylene was used for the meltblown nonwoven fabric and 100% softwood bleached pulp was used for the pulp sheet. These sheets were laminated and thermally bonded with an embossing roll under the conditions of a temperature of 120 ° C. and a linear pressure of 30 kg / cm. The fused area was 15%, and the fused pattern was a circle with a diameter of 1 mm. The results of performance evaluation are shown in Table 1 in comparison with commercially available pulp wipers and commercially available PP melt blown wipers.
[0010]
[Table 1]

[0011]
[Measuring method]
-Wet strength Wet with purified water and measure with Tensilon tensile tester. The sample is 25 mm wide, the tensile speed is 300 mm / min, and the values in the table are the square root of the product of the longitudinal strength and the transverse strength.
-Water retention amount measuring method A test piece of 75 mm x 75 mm is immersed in water for 2 minutes, then drained for 30 minutes in a saturated state, and the weight is measured. For draining, use a paper towel cut to 3 mm x 38 mm. As shown in FIG. 1, suspend in a sealed container filled with water for 30 minutes.
-Oil retention amount measuring method Using Nippon Oil Machine Oil (FBK-100), the same procedure as the water retention amount measurement is performed.
-Wiping rate measurement method The removal rate when 30 mg of Nippon Oil Machine Oil (FBK-100) was dropped on a smooth stainless steel plate and wiped with a sheet of 36 cm ² under a load of 9 g / cm ² .
・ Dust generation measurement method The atmosphere is sucked by hand-squeezing a 20 cm square sheet for 30 seconds, and the number of lint having a diameter of 0.3 μm or more contained in one cubic foot is counted by a particle counter. The numerical values in the table are converted per 1 m ² of sheet.
[0012]
【The invention's effect】
As is clear from the table, the wiper base fabric of the present invention is inferior in wet strength (with a difference in basis weight) compared to the PP meltblown wiper subjected to hydrophilic treatment, which is said to have excellent performance, There is no inferiority in oil retention. The wiping rate is also much higher than that of the pulp wiper, indicating a value close to that of the PP melt blown wiper. The dust generation rate is significantly less than that of pulp wipers, and the elution of the treatment agent does not occur as in the case of PP melt blown wipers subjected to hydrophilic treatment. Such a high-performance wiper base fabric can be manufactured at low cost, and the industrial significance of the product is great.
[Brief description of the drawings]
FIG. 1 is a schematic diagram showing draining under a saturated state in measurement of water retention amount.
[Explanation of symbols]
1 ……… Test piece 2 ……… Draining 3 ……… Water 4 ……… Lid 5 ……… Hanging tool

Claims (5)

Basis weight 5 to 100 g / ^{m 2} of softwood pulp, hardwood pulp, hemp, or a pulp sheet made of any of the recycled paper pulp, 2 layers a basis weight 3~100g / ^{m 2} melt blown nonwoven which is not subjected to a hydrophilic treatment or stacked, the heat embossing roll in it by thermal bonding, the wiper base fabric you wherein the meltblown nonwoven on both sides of the pulp sheet is laminated. The wiper base fabric according to claim 1, comprising 5 to 95 wt% of a pulp sheet and 95 to 5 wt% of a non-woven fabric sheet. The wiper base fabric according to claim 1 or 2, comprising a pulp sheet (40 to 90 wt%) and a non-woven fabric sheet (60 to 10 wt%). The wiper base fabric according to any one of claims 1 to 3, wherein a fusion bonded portion by thermal bonding is 2 to 50% with respect to the sheet surface area. The method for producing a wiper base fabric according to any one of claims 1 to 4.

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