JP2838110B2 - Wet base cloth for wipes entangled with water pressure - Google Patents

Abstract

A cloth-like nonwoven material useful for wiping and having strength, toughness, abrasion resistance and resistance to certain solvents and/or chemicals is made from mixtures of wood pulp and staple fibers randomly distributed and hydraulically entangled with each other to form a coherent entangled fibrous structure having a thickness index of at least about 0.008 and a ratio of machine direction strength to cross machine direction strength of at least about 1.5.

Description

Description: FIELD OF THE INVENTION The present invention relates to hydraulic crossover articles and other non-woven synthetic articles containing, for example, a mixture of wood pulp fibers and staple fibers, for industrial wipes and other uses. Regarding what is used.

[Background of the Invention]

For example, non-woven articles such as melt sprayed or non-woven polypropylene have been used as wipes. In cases such as the body of a finish of an automobile, the wipers generally, one or more volatile or semi-volatile solvents, for example, isopropyl alcohol / water, n- heptane, naphtha, C ₅
Infiltrate ~ C ₇ aliphatic hydrocarbons and wipe off grease, fingerprints, dirt, etc. from the body surface before undercoating or painting. Certain solvents or chemicals can cause compounds, such as low molecular weight polyolefins, to surface on already wiped vehicle surfaces,
For this reason, it may be unsuitable for painting the body surface. Many nonwovens are hydrophobic and require treatment with one or more surfactants to render them hydrophilic. The surfactant migrates to the wiped surface, which makes the surface unsuitable for priming or painting.

Some nonwovens have a low tendency to shed fibers and are used as wipes in places where lint and dust are disliked, such as clean rooms for the production of microelectronic components. However, such wipes are usually
It is treated with a surfactant, and imparts a desired absorption function and wiping performance when used in such places. Surfactant treatment is generally performed using an anionic surfactant such as, for example, sodium dioctyl sulfosuccinate having a high metal ion content. These metal ions pose special problems. This is because, when the metal ions are sufficiently concentrated, these metal ions adversely affect the electrical characteristics of the metal oxide semiconductor.

In addition, some non-woven articles have a slow rate of charge dissipation, causing accumulation of static electricity. Accumulation of static electricity on the wipe causes various problems. For example, user discomfort, danger when using a flammable solvent, or damage to high-sensitivity electrical components.

Nonwoven articles used for wiping generally require some bonding to maintain the integrity of the nonwoven web. Thermal bonding reduces the content of "active" fibers required to effect absorption. Thermal bonding is
It also results in a more rigid material, which can damage soft surfaces such as freshly painted surfaces. Chemical bonding causes problems that are potentially present in extracted binders.

For example, nonwoven articles such as bonded carded webs or webs exposed to air are entangled under water pressure into a unique web structure and used as a wipe. However, these materials generally have high strength in only one direction. This is because the fibers in the web are oriented only in one direction early in the web forming process. That is, the nonwoven article has a high strength only in one direction, for example, a longitudinal direction, and has a relatively small strength in a horizontal direction. Such non-uniformity in strength is not desirable. This is because the non-woven article tends to be torn in the direction of the weaker strength, and has to be higher than necessary in only one direction beyond the required minimum strength in the direction of the weaker strength. Because.

Synthetic hydraulic crossover articles comprising staple fibers and wood pulp fibers are generally made by laminating a wood pulp tissue layer and a staple fiber web and crossing the two layers under hydraulic pressure. One side of the resulting hydraulic crossover article exhibits a markedly different level of abrasion resistance than the other side. This is due to the way this material was made.

By processing wood pulp or a mixture of wood pulp and staple fibers, paper tissue and paper products used as wipes can be manufactured. While these wipes have desirable absorption performance, economy, and resistance to certain solvents and chemicals, they generally have low strength (especially when wet) and low durability. It has good properties, low scuff resistance, and undesired levels of lint. These wipes also have poor visual and tactile aesthetics. For example, these wipes are generally thin, sheet-like, and have a thickness index of about 0.01, or generally less than 0.01. The physical properties of these wipes, such as strength and abrasion resistance, can be improved by adding a binder. However, the addition of a binder increases the cost of the wipe and may also leave residue on the wipe surface.

The wipe can be woven from a woven article. Depending on the raw materials used, the wipes may have the desired strength and absorption performance, but they are expensive and would not be economical unless reused. Reusing the wipe is not preferred. This is because dirt that causes abrasion may remain from the previous use. Fabrics made from natural fibers also have disadvantages.
For example, many natural fibers, such as cotton, have natural oils, such as cottonseed oil, which can be dissolved by the solvent and adhere to the wiped surface . Fabrics made from artificial fibers, such as polyester, cannot absorb moisture unless treated with a surfactant to render the fibers hydrophilic.
For the reasons mentioned so far, the use of surfactants is not preferred.

[Definition]

"Peak load" is the maximum load when an object is extended and broken. The peak load is in units of force [g _f ].

"Peak energy absorbed" (Peak EA) represents the area under the load-elongation (stress-strain) curve up to the peak point or maximum load. The unit of the peak EA is work [kg-mm].

"Total energy absorbed" (TEA) represents the total area under the load-elongation (stress-strain) curve up to the point where the object breaks.

The “percentage of peak extension” is the rate of increase in the length of the specimen when the object has been extended to the peak load, that is, the maximum load. The peak elongation percentage is expressed as a percentage [%] of the initial length of the object. That is, the peak elongation percentage is represented by the formula [(increase in length) / (initial length)] × 100.

"Percentage of total elongation" is the rate of increase in the length of the specimen when the object elongates to the break point. The total elongation percentage is expressed as a percentage [%] of the initial length of the object. That is, the total elongation percentage is represented by the formula [(increase in length) / (initial length)] × 100.

The “thickness index” is a value expressed as a ratio between the thickness (unit: mm) of the object and the unit weight (unit: g / m ² ). That is, the thickness index is represented by the following equation.

Thickness index = thickness [mm] / unit weight [g / m ² ] “Vertical direction” means that when a synthetic nonwoven product is formed,
It refers to the direction of travel of the forming surface on which the fibers are disposed.

 The “horizontal direction” refers to a direction orthogonal to the “vertical direction”.

The “isotropic strength index” is a ratio of a peak load of an object in a certain direction (for example, a vertical direction) to a peak load of the object in a direction perpendicular to the direction (for example, a horizontal direction with respect to the above-described vertical direction). Means a value expressed as Usually, the isotropic strength index is expressed as the ratio of the peak load in the vertical direction to the peak load in the horizontal direction. Typically, nonwoven articles have an index greater than 1 unless a comparison of peak loads in a particular direction is specified. If the isotropic strength index is close to 1,
The non-woven article indicates that it is isotropic. An isotropic strength index greater than 1 indicates that the nonwoven article is anisotropic.

"Staple fiber" means that the average length is about 1
天然 24 mm, and a natural or synthetic fiber with an approximate denier of about 0.5-3. For example, the average length is about 6-15mm,
A denier of about 0.7 to 1.5 is applicable.

"Total absorption capacity" refers to the volume of liquid that can be absorbed by the nonwoven article and corresponds to the total amount that the nonwoven article can hold when saturated. The total absorption capacity is determined by measuring the weight gain of a sample of the nonwoven article that has absorbed the liquid,
The value obtained by dividing the absorbed liquid weight by the weight of the sample is expressed as a percentage. That is, the total absorption capacity is represented by the following equation.

Total absorption capacity = [(sample weight at saturation-sample weight) / (sample weight)] x 100 The "mop capacity" means that once the nonwoven article has reached saturation, the absorbed liquid is squeezed out and then Refers to the volume of liquid that a nonwoven article can absorb. It is for performing simulation as a multipurpose wipe. This mop volume corresponds to the amount of liquid remaining in the nonwoven after it has been squeezed out of the liquid saturated nonwoven. The mop capacity is obtained as a value obtained by measuring the difference between the weight of the nonwoven product at the time of saturation and the weight after squeezing out the liquid, and dividing this weight difference by the weight of the sample at the time of drying. Mop capacity is
The value obtained by dividing the weight of the liquid squeezed out of the sample by the weight of the dried sample is expressed as a percentage. That is, the mop capacity is represented by the following equation.

Mop capacity = [(weight of sample at saturation−weight of sample after squeezing liquid) / (weight of sample at drying)] × 100 [Summary of the Invention] The present invention solves the above-mentioned problems. To provide non-woven goods similar to cloth. The nonwoven article is made from a mixture of wood pulp fibers and staple fibers, both of which are irregularly dispersed and entangled with each other under water pressure to form a unique cross-fiber structure. Its thickness index is at least about 0.008, and the isotropic strength index is no greater than about 1.5.

The nonwoven article according to the invention is made in two steps.
First, the non-woven article is formed by a conventional wet forming method using an inclined wire. Then, nonwoven article, using conventional hydraulic crossover technique, about 500 to 2,000 lbs / inch ² (ps
Under the pressure of i) and under water pressure at a speed of about 20-300 m / min, a unique web structure is formed without thermal or chemical bonding.

The wet forming article according to the present invention comprises a mixture of wood pulp fibers and staple fibers randomly dispersed. The article generally includes about 50-90% (wt%) staple fibers and about 10-50% (wt%) wood pulp fibers. Alternatively, it may contain up to about 100% staple fibers. The unit weight of the nonwoven article resembling a cloth in the present invention is about 30 to 150 [g / m ² ].

The staple fiber used in the present invention is about 0.7 to
It can have a denier in the range of 3 and an average length in the range of about 5 to 18 mm. As staple fibers, for example, polyethylene, polypropylene, polybutene, ethylene copolymer, polypropylene copolymer,
One or more of rayon, cotton, polyester, polyamide, and polyolefin represented by butene copolymer and the like can be used. Hardwood pulp and other long fiber wood pulp are also particularly useful. Mixtures of long fiber and short fiber wood pulp can also be used.

[Detailed description of the invention]

The present invention provides a synthetic nonwoven article that resembles a cloth. The synthetic nonwoven article has great strength, toughness, abrasion resistance, resistance to certain solvents, and visual and tactile aesthetics.

For non-woven articles similar to cloth, the conventional wet forming technique using inclined wires disperses wood pulp fibers and staple fibers to form a layer of irregularly dispersed fibers on the microporous surface. It is formed by doing. One example of a wet forming method is disclosed, for example, in U.S. Pat. No. 2,414,833 to Osborne, which is incorporated herein by reference.

In the headbox of the wetting device, the degree of dispersion of the fibers is diluted, for example, about 2.5 grams of dry fiber per liter of fiber and water mixture. The consistency of the uniform layer of fibers after being formed on the microporous surface, when measured as solid fibers in water, is in the range of about 10-30% (wt%). For example, the consistency is about 25% by solid weight
It is. The uniform layer of fibers migrates to other surfaces before interlocking. As a surface for entanglement, for example, about 35 to 10
This is a 0 mesh wire screen. The entangled fibers travel to another surface and are patterned. The size of the mesh and / or the texture of the patterned microporous surface can be varied, thereby creating different visual and tactile properties. A coarse mesh, such as about 14-35 mesh, can also create the look and feel of a texture or fabric.

The newly formed layer with irregular dispersion of the fibers is entangled under hydraulic pressure to form a nonwoven article. Evans as an example of a hydraulic crossover method that entangles fibers under hydraulic pressure
No. 3,485,706, which is incorporated herein by reference. For example, to entangle the fibers, Honeycomb Systems
System, Incorporated) manifold. The manifold has an orifice approximately 0.005 inch in diameter, 1
It has a strip with 40 holes per inch, and a row of holes. It goes without saying that other manifolds may be used. Articles made by the wet-forming method travel under the strip at a speed of about 20-300 m / min, about 500
Entangled by a liquid jet having a pressure of ~ 2000 psi. It has been found that by subjecting the base fabric to hydraulic crossover at low speed and / or under high pressure, an article having higher strength can be obtained. The strength is further increased by further increasing the passage through the hydraulic crossover device.

Molding involves passing the entangled article through a coarse mesh, e.g., 14-35 mesh, and subjecting the article to a pressure of about 200-100.
This is done by applying a 0 psi hydraulic crossover.

The nonwoven article formed by the hydraulic crossover method may be dried. For drying, for example, one or more conventional drying methods using pressurized air, vacuum, heat or pressure may be used. The nonwoven article is dried on a microporous surface, such as a wire mesh. Alternatively, drying of the nonwoven article may be performed on a non-porous surface using conventional drying methods. Non-woven goods dried on the microporous surface
It is softer and more drapeable than dried on surfaces without micropores. Further, the nonwoven article dried on the microporous surface has a smaller peak load but a larger peak elongation than the nonwoven article dried on the nonporous surface.

In connection with this description, oil and water absorption capacity and absorption, linting, abrasion resistance, static decay, drape stiffness, sodium ion concentration, extraction level, peak load, absorption peak energy, total energy absorbed, peak extension And total elongation is determined by performing certain tests.

The lint test was conducted by Climate Instrument (Cl
The measurement is performed using a Climatet ™ particle analyzer C1-250 type available from Imet Instrument Company). The lint test is basically performed according to INDA standard test 160.0-83. However, the test was performed with the following two changes. (1)
The size of the sample is 6 inches × 6 inches. (2)
Background counts are not determined for each sample. The test uses a mechanical particle generator that applies bending, twisting, or breaking forces to the sample specimen. The samples are placed vertically in the enclosure, approximately
Twenty-five degrees twisted at a rate of 70 times over a distance of 4.2 inches. The enclosure is connected to the particle measuring instrument via a tube. The particle measuring instrument is to suck the particles to the instrument at a rate per hour to about 20 ^ft3. The flow rate through the sensor is 1.
0 feet ^three . Takes 36 seconds to each count, each count represents the number of a particular size of particles in 0.01 ^ft3 air.

Grab tensile test is basically the Federal test method standard No.191
Performed according to Method 5100 of A. In this test, a cross article about 4 inches wide and about 6 inches long is used as a sample. The sample is held by grips of 1 inch ² area at both ends. The equipment used to test the samples was Thing Albert's Intellect (I
ntellect) Type II Tensile Testing Machine and Universal Testing Instrument
t) Instron Model 1122 from the company. Each has a 3 inch jaw span and a crosshead speed of about 12 inches per minute. The values of peak load, absorption peak energy, peak extension percentage, total absorbed energy, and total extension percentage are determined, respectively.

The percentage of charge dissipated in a non-woven article is basically determined in accordance with Federal Test Method Standard No. 101B, Method 4046. Test results were determined using a 5 1/2 inch by 3 1/2 inch rectangular sample with an electrostatic charge detector equipped with a high voltage sample holder.

The rate at which the nonwoven article absorbs oil is determined as follows. SAE20W sample 300mm in width and 150mm in length
Lay flat on oil surface of oil tank filled with / 50 motor oil. Use a stopwatch to measure the time until the sample is completely wetted. "Completely wet"
Means that 99% of the surface area of the sample permeates with oil. The non-absorbent streaks of non-woven articles do not fall under the definition of "totally wet", but the non-absorbable fibers themselves do. The rate at which nonwovens absorb water is determined in a similar manner to that for oils. However, distilled water is used instead of oil.

The capacity of a nonwoven article to absorb oil is determined as follows. British Paper and Board Industry Federation (British Paper and Bo
ard Industry Federation) 15cm x 30c
m dry standard felt is immersed in an oil bath filled with SAE 20W / 50 motor oil for at least 24 hours. A sample of 10 cm × 10 cm nonwoven article weighed approximately 0.01 grams. Immerse the sample in the oil bath above the piece of felt (soak for at least 1 minute) until the oil has completely penetrated the sample. The felt and sample are then removed and the felt and sample are suspended on the oil bath until oil dripping from the sample is completed within a visible range, that is, until the sample exhibits a single color. The oil is drained from the sample to approximately 0.01 grams and the total absorption capacity is calculated.

The mop capacity of the nonwoven article is determined by folding the sample used in the total absorption capacity test in half and then again in half. The thumb and forefinger then grip the sample at both ends, twist the sample as much as possible, and squeeze the oil from the sample. Oil is drained while twisting the sample. When no more oil is drained from the sample, stop twisting the sample. Thus,
Drain the oil from the sample until it is approximately 0.01 grams and determine the mop capacity.

Drape stiffness was measured using a stiffness tester from Shirley Developments Limited. The test results were determined basically according to ASTM standard test D1388. However, the size of the sample was set to 1 inch × 8 inches, and the standard test was changed and the test was performed in that the length in the test direction was increased.

(1) Discharge rate of isopropyl alcohol, 1,1,1-trichloroethane, and distilled water, and (2) concentration of sodium ion were determined by the following procedures. A pair of wipe samples weighing about 2 grams are refluxed for 4 hours in 200 ml of solvent using a Soxhlet extractor. The solvent is evaporated and the sample is dried. Next, the weight difference of the container before and after the evaporation of the solvent is measured to determine the extraction rate (percentage). Extraction rate is% by weight based on the initial weight of the nonwoven
It is expressed as The amount of sodium in the sample can be determined by measuring the sodium ion concentration in the water determined from the Soxhlet extractor after the water extraction rate test.
You can ask. Perkin-El
mer) The sodium ion concentration in water was measured using a model 380 atomic absorption spectrophotometer.

The abrasion resistance properties of the nonwoven articles were determined essentially according to British Standard Test Method 5690: 1979. However, the test was conducted with the following changes. (1) The abrasion machine used was "Martindale abrasion and abrasion tester No.103 type" (trade name, manufactured by Ahiba-Mathis). (2)
Samples or 1.3 lbs / inch ² (psi), 9
It was subjected to 100 abrasion tests under a pressure of kilopascals (KPa). (3) Surface hardness is 81 ± 9 with 81A durometer
Shore hardness of 36 inches x 4 inches x 0.050 (±
0.005 ”inch glass fiber reinforced silicone rubber strip (Flight Insulation Inc. (Flig
ht Insulation Incorporated), a 1.5 inch diameter abrasive is cut out. (4) The samples are tested for fuzz on the surface (lofting of fibers), pilling, roping, and presence or absence of holes. The sample is then compared to a visual indicator and the sample is given a degree of wear of 1-5. A degree of wear of 1 means that there is little or no visible abrasion, and a degree of wear of 5 means that the sample is perforated due to wear.

Experimental Example 1 Approximately 50% by weight of hardwood pulp (a product of Weyerhauser, trade name "Grade Regular") and approximately 50% by weight of non-crimped polyester staple fibers were dispersed to a solid concentration of about 0.5% weight percent of a mixture of (1.5 denier × 12 mm), to form the handsheets of approximately 75 [g / m ^2] in a standard 94 × 100 mesh plastic on the screen .

The fibers of the handsheet are entangled using a manifold (the above-mentioned Honeycomb product). Pass the handsheet through a standard 100 × 92 mesh stainless steel wire. The manifold is located approximately 0.5 inches above the stainless steel wire mesh. The manifold has a diameter of 0.00
It has a 5 inch orifice, 40 holes per inch, and a strip with a row of holes. The strip is inserted inside the manifold with the conical hole facing the wire. Fiber crossing is performed while advancing the handsheet at a speed of about 20 m per minute.

Fiber crossing of the handsheet, the pressure applied to one side of the handsheet 200, 400, 600, 800, 1200, 1400 (ps
i], and the pressure applied to the other surface was set to 1200 or 1400 [psi]. The flow rate of fiber crossing water was 1.054 m ³ per hour per inch of stop. The sheet after the fiber crossing was air-dried at room temperature. The unit weight of the dried sheet was about 70 [g / m ² ].

Testing of a sample of fiber crossed articles having a width of about 4 inches was performed using Thing Albert's Intellect II tensile tester and Universal Testing Instrument.
ing Instrument's Instron model
Model) 1122. Each has a 3 inch jaw span and a crosshead speed of about 12 inches per minute. The values for peak load, peak energy absorbed, percentage peak elongation, total energy absorbed, and percentage total elongation for the dried sample are shown in Table 1 for the machine and transverse directions, respectively. Similar data for the wet sample only in the machine direction are also shown in Table 1.

Experimental Example 2 Approximately 20% by weight of hardwood pulp (product of Weyerhauser, trade name "Grade Regular") and approximately 40% by weight of non-crimped polyester staple A mixture of fibers (1.5 denier × 12 mm) and about 40% by weight of uncrimped rayon stable fibers (1.5 denier × 12 mm) is dispersed into a mixture of about 75% on a standard 94 × 100 mesh plastic screen. g / m ² ].

Hand sheet fiber crossover is standard 100 x 92 mesh
Using the same equipment and procedure as in Example 1 on stainless steel wire, the pressure on one side of the handsheet was raised to 60
0, 900, 1200, 1500 psi and the pressure on the other side is 1
Performed at 200, 1500 psi. The flow rate of the fiber crossover water was hour 0.808M ³ per strip 1 inch. The sheet after the fiber crossing was air-dried at room temperature. The unit weight of the dried sheet was about 73 [g / m ² ].

Testing of a sample of the fiber cross article having a width of about 4 inches is performed using the same equipment and procedure as in Example 1. The values of peak load, peak absorption energy, percent peak extension, total absorbed energy, and percent total extension for the dried sample are shown in Table 2 for the machine and transverse directions, respectively.

Experimental Example 3 Approximately 18.5% by weight of hardwood pulp (a product of Weyerhauser, trade name "Grade Regular") and approximately 78.5% by weight of non-crimped polyester staples A mixture of fibers (1.5 denier × 12 mm) and about 3% by weight of polyvinyl alcohol-bound fibers is dispersed and continuously formed on the microporous surface at a rate of about 60 [g / m ² ]. The web is formed using a continuous inclined wire paper machine. The web is dried on a series of steam-heated cans. Polyvinyl alcohol is added to facilitate winding and handling.

Rewet the dried web and use standard equipment 100 × 92 mesh stainless steel wire with 6 passages and 1800 psi pressure on each side of the sheet, using the same equipment and procedure as in Example 1. Fiber crossover takes place above. The flow rate of fiber crossing water was 2.04 m ³ per hour per inch of strip. The sheet after the fiber crossing was air-dried at room temperature. The unit weight of the dried sheet is approximately 53 g / g
m ² ].

Testing of a sample of the fiber cross article having a width of about 4 inches is performed using the same equipment and procedure as in Example 1. The values for peak load, peak energy absorbed, percentage peak elongation, total energy absorbed, and percentage total elongation for the dried sample are shown in Table 3 for the machine direction and the transverse direction, respectively.

Experimental Example 4 Approximately 19% by weight of hardwood pulp (a product of Weyerhauser, trade name "Grade Regular") and approximately 39% by weight of non-crimped polyester staple A mixture of fibers (1.5 denier x 12 mm), about 39% by weight of uncrimped rayon staple fibers (1.5 denier x 12 mm), and about 3% by weight of polyvinyl alcohol binding fiber is dispersed, It is continuously formed on the surface of the micropores at a rate of 60 [g / m ² ]. The web is formed using a continuous inclined wire paper machine. The web is dried on a can heated in series with steam. Polyvinyl alcohol is added to facilitate winding and handling.

The dried web is pre-wetted and fiber crossover is performed on a standard 100 × 92 mesh stainless steel wire using the same equipment and procedure as in Example 1. The pre-wetting process of the web was performed on a non-woven surface at a pressure of 200, 400, 600 [psi]. The fiber crossover in that plane is 800, 1
It is performed at a pressure of 000, 1200, and the three passages have a pressure of 1500 [ps
i]. The other side of the nonwoven was fiber crossed through a 1500 psi path. The sheet after the fiber crossing was air-dried at room temperature. The unit weight of the dried sheet was about 53 [g / m ² ].

Testing of a sample of the dried fiber cross article having a width of about 4 inches was performed using an Intellect II tensile tester having a 3 inch jaw span and a crosshead speed of about 10 inches / minute. The peak load, absorption peak energy, and peak strain values for the dried sample are shown in Table 4 for the longitudinal and transverse directions, respectively. Similar results are shown in Table 4 for the wet samples.

For comparison, Table 5 shows the thickness index and the isotropic strength index for the fiber crossed article of Experimental Example 2, the fiber crossed article and the non-crossed article of Experimental Example 4, and two commercially available products that can be used as wipes. , Abrasion test results, and drape stiffness test results. The wipe A is a non-woven product cross-linked under water pressure (a product of EI duPont De Nemours and Company, trade name "Sontara", grade 800).
Five). Wipes B are made from a mixture of wood pulp and staple fibers formed by laying a wood pulp web on a staple fiber web and then crossing the web under water pressure. Cloth B is "Mohair
Bleu '', a French brand called `` Maury o
f Nantes ”and“ Sodave of Angers ”. Table 5 also lists the thickness index and isotropic strength index for these articles.

As can be seen from Table 5, the fiber-crosslinked articles of Experimental Examples 2 and 4 were the non-fiber-crosslinked articles of Experimental Example 4, wipes A and B
Has a greater thickness index. Experimental Examples 2 and 4
Has a greater isotropic strength index than wipes A and B.

Table 6 shows the absorption rates of the articles of Experimental Example 4 for oil and water,
The test results of total absorption capacity and mop capacity are shown.
The article of Experimental Example 2 has values of the total absorption capacity and the mop capacity for water and oil which are much larger than those of the wipe B.

Tables 7, 8 and 9 show the test results for the articles according to the invention and for various wipes marketed in Europe. The wipe CW1 is made of a melt sprayed polypropylene cloth. Cloth CW2 is non-woven polypropylene
Consists of a meltblown polypropylene-nonwoven polypropylene laminate. The wipes marketed under the trade name "MIRACLE WIPES" are made by crossing staple fibers and cellulose fibers under water pressure. Product name "CLEAN ROOM WIPERS"
The wipes marketed under the trade name are made from wet formed staple fibers and cellulosic fibers. Product name "DURX"
Is manufactured by crossing staple fibers and cellulose fibers under water pressure. Product name "LA
The wipes marketed under "BX" are made from wet formed staple fibers and cellulosic fibers. Product name "TE
The wipes marketed under XWIPE are made of 100% cotton woven fabric. The wipes marketed under the trade name "MICRONWIPE" are made by crossing staple fibers and cellulose fibers under water pressure. The wipes marketed under the trade name "TEXBOND" are made of non-woven nylon cloth. The wipes marketed under the trade name "TECHNI-CLOTH" are made by crossing staple fibers and cellulose fibers under water pressure.

For comparison, Table 7 lists the results of the extraction test and the sodium ion test on the articles of Example 2 and some of the wipes described above. Table 7 also shows the test results for two articles made according to Example 2. Article H contains about 80% by weight rayon staple fiber and about 20% by weight wood pulp. Article F contains about 80% by weight polyester staple fibers and about 20% by weight wood pulp. Table 8 lists the results of the charge dissipation test for the article of Example 2, Wiper A, and some of the aforementioned wipes. Table 9 lists the results of the Climet ™ lint test for the articles of Example 2, the fiber-crossed and non-fiber-crossed articles of Example 4, wipe A and some of the above-described wipes. I have.

As shown in Table 7, the extraction levels of the articles according to the invention are advantageous compared to many commercial wipes. As can be seen from Table 8, the articles according to the invention have not been subjected to an antistatic treatment, but exhibit a static decay comparable to many other commercial products. As can be seen from Table 9, the articles according to the invention have a relatively low lint level, which is advantageous compared to other commercial products.

Thus, it is clear that the present invention can provide a wipe that solves the problems that previous wipes had. Although the invention has been described with reference to a particular embodiment, this embodiment is illustrative only and is not intended to limit the invention to this embodiment. Obviously, many applications can be made by those skilled in the art without departing from the scope of the invention.

────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Evahart Sherry H. USA Georgia 30201 Alpharetta Shadow Spring Drive 100 (72) Inventor Vander Wehren Michael J. United States Georgia 30075 Roswell Roswell Farms Road 360 (56 References JP-A-63-222728 (JP, A) JP-A-54-6973 (JP, A) JP-A-58-132155 (JP, A) JP-A-56-91052 (JP, A) 59-183723 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) D21H 11/00, 13/10 D04H 1/46

Claims (12)

(57) [Claims] A fibrous structure entangled under water pressure, comprising: from about 0 to 50% by weight of woody pulp fiber; and from 50% to about 100% by weight of staple fiber; from about 30 g / m ² to about 150 g / m ^2, a thickness index of at least about 0.008, isotropic strength index of about
A fibrous structure characterized by being less than 1.5. 2. The fiber structure of claim 1, wherein the fiber structure comprises 10 to 50% by weight of wood pulp fiber, and 50% to about 90% by weight of staple fiber. Characteristic fiber structure. 3. The fiber structure according to claim 1, wherein said staple fibers have a denier ranging from about 0.7 to about 3 and a length ranging from about 5 mm to about 18 mm. A fiber structure characterized by the above. 4. The fiber structure according to claim 1, wherein said staple fibers are made of one or more of rayon, cotton, polyester, polyolefin, and polyamide. Construction. 5. The fibrous structure of claim 1, wherein the fibrous structure has an oil absorption capacity of at least about 300%. 6. The fibrous structure according to claim 1, wherein the fibrous structure has an oil absorption capacity of at least about 375%. 7. The fiber structure according to claim 1, wherein said fiber structure has a sodium ion concentration of about 150 ppm or less. 8. A hydraulically entangled fibrous structure capable of stretching in at least one direction by 104%, comprising from about 0 to 50% by weight of wood pulp fiber and from 50 to about 100% by weight. Having a unit weight of about 30 g / m ² to about 150 g / m ² , a thickness index of at least about 0.008, and an isotropic strength index of about
A fibrous structure having a water absorption capacity of less than 1.5, a water absorption capacity of at least about 375%, and a sodium ion concentration in hot water of about 150 ppm or less. 9. The fiber structure of claim 8, wherein the fiber structure comprises: 10 to 50% by weight wood pulp fiber; and 50% to about 90% by weight staple fiber. Characteristic fiber structure. 10. The fibrous structure of claim 8, wherein said staple fibers have a denier in a range from about 0.7 to about 3 and a length in a range from about 5 mm to about 18 mm. A fiber structure characterized by the above. 11. The fiber structure according to claim 8, wherein said staple fiber is made of one or more of rayon, cotton, polyester, polyolefin, and polyamide. Construction. 12. The fibrous structure according to claim 8, wherein the level of the material extractable with isopropyl alcohol is 0.2% by weight and the level of the material extractable with 1,1,1-trichloroethane is 0.1%. % By weight.