JP2005143852A - Wiper with raised projections - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiper having superior removing property of dirt firmly stuck to an object, having superior wiping property of fine dirt left on the object, scarcely forming surface naps or falling off fibers, and hardly slipped off from the hand when wiping the object forcefully when removing the dirt firmly stuck thereto. <P>SOLUTION: This wiper is formed by stacking a bulk fiber sheet having raised projections on its surface and a fiber sheet having a smooth face on its surface. The bulk fiber sheet is substantially formed of continuous fibers and 50-90% of the component fibers are formed of bundled fibers each formed by fusing two or more fibers. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wiper. More specifically, each of the wipers has a raised protrusion with rigidity on one surface, and a fiber sheet having a flat and flexible touch on the other surface. The present invention relates to a wiper in which the surfaces play different roles and are excellent in wiping off fine dirt and sticky dirt.

Conventionally, many wipers have been proposed that have a soft texture, good fit to the object, and good wiping properties by using short fiber nonwoven fabrics, brushed fabrics, or extra fine fibers made of natural fibers such as cotton and pulp. ing.
However, even though these wipers can wipe off fine dirt such as dust and dust, it has been pointed out that it is difficult to wipe off dirt stuck to the cleaning surface, and surface fluff and fiber fall off occur.

  A wiper having a brushed surface is also known (see, for example, Patent Document 1). The wiper wipes delicate dirt mainly by soft brushing, and removes strong dirt that is stuck. In this case, the raised hair is easily deformed, and a scraping effect cannot be expected.

  On the other hand, for the purpose of improving sticky dirt and oil film cleanliness and dust absorption, a wiper has been proposed in which thick fibers of 11 dtex or more and ultrafine fibers are mixed and the fibers are bonded by a spray method or the like (patent). Reference 2). However, such a wiper is composed of a non-woven fabric made of short fibers, and even if it is firmly entangled by needle punching or hydroentanglement and fixed with a binder, it is powerfully targeted to remove strong dirt. It has been pointed out that when the object is rubbed, the fibers fall off and the object is rejected and contaminated. In addition, it has been pointed out that the number of times of rubbing needs to be increased considerably when scraping even the fine dirt.

  In addition, for the purpose of mainly improving the scraping property of stuck dirt, there is provided a cleaning sheet comprising a thermoplastic short fiber having a specific fineness and a cellulosic fiber, and having the surface of the thermoplastic short fiber exposed on the surface. Although proposed (see Patent Document 3), the thick fiber that works to remove the sticky dirt is unsuitable for removing fine dirt, and it is rubbed with the force of what is fixed with a binder. Sometimes fibers fall off along with dirt. Or, in use, when the operation of pinching the sheet is added, the problem that the fibers fall out similarly occurs. Furthermore, even when such a thick fiber is made into a uniform web, there is a problem that it is very difficult to form a uniform web because the fiber is too thick. Furthermore, there is a problem that when the object is wiped off with force, the wiper easily slips out of the hand.

JP-A-9-66014 Japanese Patent Laid-Open No. 6-14860 JP 2003-61885 A

  The object of the present invention is excellent in the removal of dirt firmly adhered to the object, excellent in wiping off fine dirt remaining on the object, and is less likely to cause surface fluff and fiber dropping. An object of the present invention is to provide a wiper that is less likely to slip from the hand when the friction between the object and the smooth fiber sheet surface is large when wiping off fine dirt.

  The present inventor has made extensive studies to solve the above-mentioned problems, and provided a rough raised protrusion on one surface and a wiper having a smooth and dense surface on the opposite surface, thereby providing a rough surface on the object. Easily remove large dirt or dirt firmly stuck on the object, and use the surface made of smooth and dense non-woven fabric on the opposite side without changing the sheet as it is, and the fine remaining on the object The present inventors have found that it is possible to wipe off dirt and have reached the present invention.

  That is, the present invention is a wiper in which a bulky fiber sheet having a raised protrusion on the surface and a fiber sheet having a smooth surface on the surface are laminated, and the bulky fiber sheet is substantially composed of continuous fibers. The wiper is characterized in that 50 to 90% of the constituent fibers form two or more fused bundle fibers.

  According to the present invention, the large dirt on the object or the dirt firmly stuck on the object is removed, and the fine surface remaining on the object can be removed by using the smooth surface of the opposite surface without changing the sheet as it is. It is possible to obtain a wiper that can remove various stains and hardly cause surface fluff or fiber dropping.

  The wiper of the present invention is composed of a composite sheet having a surface having a specific-shaped protrusion and a surface made of a smooth and dense fiber sheet, and the protrusion has rigidity. The effect of removing the coarse and hard dirt foreign matter and entwining the fluff, hair, dust and cotton-like foreign matter due to the form of the raised protrusions. However, it is difficult to wipe off fine dirt due to the shape of this protrusion, and there are cases where fine dirt foreign matter remains on the object. In this case, the remaining dirt foreign matter is wiped off by the smooth sheet surface combined with the opposite surface, and the object is cleaned.

  The bulky fiber sheet constituting the wiper of the present invention is substantially composed of continuous fibers and has a specific raised protrusion on one surface thereof. Is not particularly limited. The raised protrusions may be applied to a fiber sheet having a flat surface by post-processing or the like, but by using a melt blow method, a bulky fiber sheet having protrusions can be produced efficiently and at low cost. .

  Regarding the spinning method of the polymer by the melt blow method, the basic apparatus and method are disclosed in Industrial and Engineering Chemistry, Vol. 48, No. 8 (p1342-1346), 1956. .

  When manufacturing the bulky fiber sheet used for this invention using a melt-blowing method, it manufactures by collecting the fiber flow injected from the nozzle by an uneven surface. That is, when the fibers enter and solidify into the concave portion of the collection surface, a raised protrusion is formed on one surface of the nonwoven fabric. The concavo-convex surface is preferably composed of a metal surface provided with a large number of protrusions or recesses having an arbitrary shape, a wire mesh having an appropriate mesh, a needle cloth or the like. Among them, it is particularly preferable to use a net having a three-dimensional structure generally called a conveyor net because a melt-blown nonwoven fabric having raised protrusions can be manufactured more easily.

  The material constituting the bulky fiber sheet used in the present invention is preferably a thermoplastic resin such as polyolefin, polyester or polyamide from the viewpoint of productivity, product safety and cost. Of these, polyolefin, particularly polypropylene, is preferably used because of the excellent rigidity of the raised protrusions and low cost.

When polypropylene is used, the MFR is preferably 400 g / 10 min or less, more preferably 200 g / 10 min or less, and particularly preferably 10 to 100 g / 10 min.
When the MFR exceeds 400 g / 10 min, the fiber flow discharged from the nozzle is easily thinned, and it may be difficult to maintain a large fineness. On the other hand, if the MFR is less than 10 g / min, the resin viscosity becomes too high, and it may be difficult to discharge the resin from the nozzle due to the pressure loss.

  On the other hand, when polyester is used, the intrinsic viscosity is 0.7 or more, preferably 0.8 to 1.5. In the case of polyamide, the relative viscosity is 2.0 or more, preferably 2.2 to 3.0. By using such a production method and resin, it is possible to easily produce a bulky fiber sheet in which a raised self-supporting raised protrusion is formed on the sheet surface.

  In order to form the raised projections on the sheet in the present invention, it is important that the fibers in the meltblown fiber stream are in a thick state before thinning and reach the collection surface before the fibers are solidified. . And since it is necessary to peel away from the collection surface which has an unevenness | corrugation after the fiber flow solidifies, it may be necessary to cool a collection surface.

  Also, when forming a melt blown nonwoven fabric, the fiber flow is collected to form a substantially continuous fiber, to form a fused bundle of fibers, and to impart appropriate rigidity to the raised protrusions. It is desirable to lengthen the time until solidification by increasing the fiber diameter by shortening the length or increasing the resin viscosity. Specifically, the collection distance is preferably in the range of 5 to 100 cm, more preferably 10 to 60 cm. The resin viscosity varies depending on the resin used and the melting temperature, but the melt viscosity is preferably 10 to 100 Pa · s, more preferably 20 to 50 Pa · s.

  The raised protrusions thus obtained do not necessarily have to stand upright, but preferably have a certain degree of rigidity and stand up in a raised shape. In other words, when the raised hair is weak and the self-supporting property is poor, it may be difficult to scrape off the hard or firmly adhered foreign matter on the object.

In the state that the protrusion is thinned to a fiber diameter of about 3 μm as found in a normal melt blown nonwoven fabric, the fiber is soft even if it is simply raised, and it is difficult to scrape off the stuck dirt. In some cases, it is not possible to obtain the rigidity of the fiber. In other words, by increasing the fiber diameter, it is possible to secure the force to scrape off the sticking dirt, but as the fiber becomes thicker, the force to scrape off the dirt increases while it becomes difficult to scrape uniformly. Problems arise.
Therefore, the bulky fiber sheet used in the present invention preferably has an average fiber diameter in the range of 5 to 50 μm in order to ensure a good balance between such scraping force and uniform scraping. More preferably, it is 30 μm.

  Further, it is important that 50 to 90% of the constituent fibers of the bulky fiber sheet are fused substantially in parallel to form a bundled fiber, preferably 55 to 80%. When the bundled fibers are present in a specific ratio, it is possible to evenly scrape strong sticky dirt.

The bulky fiber sheet has a basis weight of 20 to 200 g / m ² , more preferably 30 to 100 g / m ² . When the basis weight is less than 20 g / m ² , the strength of the bulky fiber sheet itself is low, and it may be difficult to hold the raised protrusions on the surface. On the other hand, if the basis weight exceeds 200 g / m ² , the sheet itself has sufficient strength to hold the raising, but it may be disadvantageous in terms of cost.

  Further, the raised protrusions of the bulky fiber sheet are preferably present regularly at regular intervals, but the present invention is not limited to this, and it may be irregularly distributed over the entire surface.

The raised protrusions of the bulky fiber sheet need to be rigid to the extent that it is possible to “scrap off sticky dirt”, which is the object of the present invention. As an index of rigidity, a stress when compressed by a circular compressor having a diameter of 100 mm described later can be used.
The bulky fiber sheet used in the present invention preferably has a stress during compression of 0.2 mm of 30 to 500 g, more preferably 40 to 300 g, and still more preferably 60 to 200 g. When this stress exceeds 500 g, the raising is too rigid and the possibility of damaging the wiping surface increases. On the other hand, when this value is less than 30 g, the raised brush has low rigidity, and it cannot be expected to scrape off sticky dirt.

  In order to exhibit such rigidity and make the protrusions difficult to fall off, fusion of fibers in the web is an important factor. In the present invention, as described above, there are bundled fibers in which two or more fibers are fused together in a bundle, so that even the thin brushed fibers have the necessary rigidity and prevent the brushed protrusions from falling off due to friction during wiping. It expresses sex.

The raised protrusions preferably have a height of 0.2 to 5 mm from the viewpoint that more fluff, cotton-like foreign matter and the like on the surface to be wiped can be removed more accurately and efficiently.
If the height is less than 0.2 mm, the amount of foreign matter that can be removed may be reduced. On the other hand, if it exceeds 5 mm, it is difficult to maintain the rigidity of the protrusion, and it may not be possible to remove the dirt firmly adhered to the object.
Further, the density of the raised protrusions is preferably 3 pieces / cm ² or more, more preferably 10 to 50 pieces / cm ² , and still more preferably 10 to 30 pieces / cm ² . If the density is too high, the protrusions will not easily enter the gaps between the foreign objects on the object. On the other hand, if the density is too low, the dirt cannot be accurately captured and the remaining wiping will be significant. The shape of the protrusion is not particularly limited as long as it basically achieves the object of the present invention. For example, various shapes such as a conical shape, a cylindrical shape, a pyramidal shape, a prismatic shape, or a raised shape are exemplified. It is done. If it is this shape, there exists a merit that it is easy to catch the stain | pollution | contamination on a target object, and a foreign material more correctly.

  Among these, the raised protrusions are integrally formed on a bulky fiber sheet, and a fiber bundle in which a single fiber or a plurality of fibers are fused is a nonwoven fabric in a raised, looped or indeterminate tangled thread shape. Those standing on the surface are preferred. The raised protrusions may be regularly arranged at regular intervals or irregularly formed by contraction or the like.

  Specifically, the raised protrusions have, for example, a large number of raised protrusions 2 on the surface of the bulky fiber sheet 1 as seen in FIG. The raised projections 2 act to scrape off the stuck dirt.

  Further, on the surface opposite to the surface having the raised protrusions (bulky fiber sheet) in the wiper of the present invention, a fiber sheet such as a woven fabric, a dry nonwoven fabric, a wet nonwoven fabric, or a paper according to the required object wiping performance Are laminated. Among these, it is preferable to use a dry nonwoven fabric from the viewpoint of cost and workability. And when higher performance wipeability is required, it is possible to obtain the wiper which has higher wiping performance by using the nonwoven fabric using a special fiber or a split fiber.

When a nonwoven fabric is used as the fiber sheet used in the present invention, the nonwoven fabric is not particularly limited as long as the surface is a nonwoven fabric having a smooth surface, and may be similar to a general nonwoven fabric wiper. However, a polyolefin fiber or polyolefin is preferred because a bulky fiber sheet having raised protrusions to be laminated is preferably made of polyolefin, inexpensive and easy to obtain, and easy to laminate. The nonwoven fabric which consists of a composite fiber which is exposed to the fiber outer peripheral part is preferable. Moreover, since this nonwoven fabric is used for the purpose of cleaning the wiping remaining portion of the nonwoven fabric having the raised protrusions, it is preferably made of fibers with a fineness as much as possible, and examples thereof include nonwoven fabrics using split fibers.
In the present invention, the production method is not particularly limited, and general dry nonwoven fabrics or wet nonwoven fabrics to ultrafine fiber nonwoven fabrics can be used.

The wiper of the present invention can be obtained by laminating a fiber sheet having a smooth surface on the surface of the bulky fiber sheet having the raised protrusions obtained in this way and having no raised protrusions.
The bulky fiber sheet and the method for fixing the fiber sheet are not particularly limited, but a method such as fixing with a pressure-sensitive adhesive or an adhesive or sewing with a thread can be employed.

  On the other hand, when laminating the bulky fiber sheet on a knitted fabric, it is preferable to perform point bonding or line bonding using hot embossing, pin sonic, hot melt method or the like. Also, during lamination, it is desirable not to crush the raised protrusions of the bulky fiber sheet as much as possible, and in order to maintain air permeability, it is desirable that the bonding area is small, so the two are not bonded together It is preferable to perform point bonding or line bonding.

Further, in the thermal bonding step, it is preferable that the thermocompression bonding portions are spaced as wide as possible and laminated with the raised protrusions of the bulky fiber sheet held in the widest possible range. For example, when laminating and bonding by hot embossing, that is, a combination of a metal handle roll and a flat roll, the thermocompression bonding portion has a distance of 3 mm or more between adjacent thermocompression bonding portions in at least one direction in the web plane direction. Is preferred. Examples of the crimping portion include circular or polygonal dots, stripes, lattices, honeycombs, and the like.
The partial adhesion is preferably 1 to 50% of the entire sheet surface. Further, it is preferable that the sheets are joined only by the surface layer that comes into contact with each other as much as possible.

Furthermore, the height of the thermocompression bonding part is preferably about 80% or more of the total thickness of the sheets to be laminated. This is because if the height is low, even if the interval between the crimping portions is widened, the raised projections of the fiber sheet are crushed and do not function.
The above conditions are the same for the pinsonic anvil roll.
Furthermore, regarding the lamination with hot embossing, it is preferable to make the temperature of the embossing roll as low as possible. This is because if the embossing temperature is too high, the raised protrusions of the meltblown nonwoven fabric are crushed during lamination.

In the present invention, a three-layer structure in which a heat-adhesive sheet, particularly a sheet made of a thermoplastic elastomer is disposed between the bulky fiber sheet and a fiber sheet having a smooth surface, may be bonded and integrated. It is preferable.
In this case, since a sheet made of an intermediate thermoplastic elastomer acts as an adhesive, a smooth fiber sheet on the opposite side of the nonwoven fabric having the raised surface protrusions on the surface exhibits excellent adhesion even if it is not necessarily the same type of material. Therefore, a wide variety of fiber sheets can be used.

Examples of the thermoplastic elastomer constituting the heat-adhesive sheet include polystyrene-based thermoplastic elastomers, polyolefin-based thermoplastic elastomers, polyurethane-based thermoplastic elastomers, polyester-based thermoplastic elastomers, polyether-based thermoplastic elastomers, and polyamide-based thermoplastics. An elastomer etc. can be mentioned.
Although the manufacturing method in particular of this thermoadhesive sheet is not restrict | limited, The melt blow method using the said thermoplastic elastomer is preferable at the point which can manufacture efficiently.

  In the present invention, as a laminating method in the case of a three-layer structure, a method capable of expressing an action as an adhesive by melting a nonwoven fabric made of a thermoplastic elastomer disposed in the middle of an embossing method, a pin sonic method or the like. If it is, it will not specifically limit. Among these, as a preferable method, an embossing method is common, and it is a method that can be easily laminated. In this case, the embossed pattern to be used is preferably a pattern that does not crush the raised protrusions. For example, a striped pattern or a lattice pattern in which the lattice is 3 mm or more in both length and width, or an embossed pattern in which dimple-shaped recesses are continuous and the dimple diameter is 3 mm or more is effective.

  The wiper laminated in this way is a laminated body composed of a surface having a raised protrusion and a smooth and flexible sheet, and collects foreign matter such as large dirt and hair on the surface having the raised protrusion, or The surface to be wiped is cleaned by scraping off strong dirt and wiping off fine dirt and foreign matter on the flat surface on the opposite side.

It is also used when the sliding friction between the hand and the wiper is greater than the sliding friction between the wiper and the object to be wiped, or in combination with a denser sheet or a sheet with higher frictional resistance. In this case, the raised protrusions present in the wiper of the present invention also exhibit the effect of preventing the wiper from slipping off the hand during use.
For example, when wiping off a surface with high frictional resistance, or when wiping the glass surface with a rubbery sheet having a surface like a chamois, etc. In such a case, the raised protrusions of the wiper of the present invention By wiping the object so that is on the palm side, you can work well without the wiper moving away from your hand.

  Further, in order to further bring out the performance of the wiper of the present invention, it is also possible to use it by impregnating with detergent or alcohol.

  EXAMPLES Hereinafter, although an Example demonstrates this invention in more detail, this invention is not limited to these Examples at all. Each physical property value in this example was measured by the following method.

・ Average fiber diameter Using a scanning electron microscope (SEM), take a photograph of the surface of the nonwoven fabric magnified 500 times, draw two diagonal lines on this photograph, and multiply the thickness of the fiber that intersects with this diagonal line The converted value was used. And the average value of these 100 fibers was used as an average fiber diameter. However, the fused fiber was excluded from the subject because the fiber diameter could not be measured clearly.

-Strength and elongation Each of the MD direction and the CD direction of the sheet was measured according to JIS L1906.

-Ratio of bundled fibers Using a scanning electron microscope (SEM), take a photograph of the cross section of the nonwoven fabric magnified 500 times, draw two diagonal lines on this photograph, and the thickness of the fiber that intersects this diagonal line Was used as a magnification conversion value. Then, a number of photographs of 100 or more of these fibers were taken, and the 100 fibers in the photograph were counted and calculated according to the following formula. The fibers in the fiber bundle state are assumed to be in a form in which two or more fibers are fused over a length of 100 μm or more, and one bundle is counted as one.
Ratio of bundled fibers = (number of fibers in a bundle of fibers / 100) × 100 (%)

-Height of raised projections Take a 50x photograph of the cross section of the sheet with a microscope, draw tangent lines on the front and back surfaces of the sheet excluding the projections, measure this distance at any five locations, and average these values Was defined as “sheet thickness”. On the other hand, the distance between the apex of the protrusions and the web surface (back surface) on the opposite side was measured at any 10 points, and the average value was defined as “total thickness of the sheet”. The difference between the “total sheet thickness” and the “sheet thickness” was defined as the “projection height”.
Projection height = total sheet thickness-sheet thickness

・ Density of brushed protrusions Take a 50x photograph of the cross section parallel to the MD direction of the sheet with a microscope, and measure the tangent on the protrusion side of the sheet and the distance from the apex of the protrusion at any 10 points. Then, a line parallel to the tangent on the web protrusion side is drawn at an interval (height) of 1/3 of the average value. The number of protrusions protruding from this line per 1 cm is defined as “the number of MD unit protrusions”. Also, the number of protrusions measured in the same manner for the cross section parallel to the CD direction is defined as the “number of CD unit protrusions”.
And these products were made into the density of a projection part.

- projection of the rigid compressive elasticity tester (manufactured by Shimadzu Corporation, Autograph 5KND) used, under a load of 7 g / cm ² sheets tested in a circular compression child face of 100mm diameter, 0.1 mm / The sample was compressed at a rate of minutes, and the relationship between the displacement and the stress was charted. The displacement when the compression stress was 10 g was set to 0 mm, and then the stress when compressed by 0.2 mm was measured. It was judged that the greater the value, the higher the rigidity of the protrusion.

-Hair collection property 20 female hairs (length: 10 cm) were spread as evenly as possible on a wooden floor test plate (30 × 100 cm: Okura Kogyo's composite kind flooring 589 irregular scale). Next, a sample sheet of the same size is fixed to an acrylic plate (20 cm × 20 cm × 2 mm thickness) with a double-sided tape, a 500 g weight is placed on the acrylic sheet, pulled and reciprocated three times, and then the hair adhering to the test piece The number of was measured.

-Sticking dirt wiping property About 100 mg of a commercial stick paste (manufactured by KOKUYO Ta-320N Pritt) was uniformly applied to an area of 100 cm ² on an acrylic plate, and this was left at room temperature for 10 minutes. The sample sheet was then rubbed with 20 reciprocating hands. Thereafter, the mass of the acrylic plate was measured, and the mass reduction rate of the stick glue was measured.

-Fiber drop-off at the time of wiping The acrylic plate after the above-mentioned sticky dirt wiping test and the glue that was wiped off were visually observed, and the number of protruding fibers dropped off was counted.

-Hard to wipe wiper (tensile shear strength; shear strength)
According to JIS L3416, it measured in the state which applied the load of 5 g / cm < ² >.

Polypropylene resin with MFR 60g / 10min (according to JIS K6921-2; 230 ° C, 21.18N load) is melt-extruded by an extruder and discharged from the nozzle at a spinning temperature of 285 ° C and a single-hole discharge rate of 0.5g / min · hole. The fiber stream thinned by high-speed hot air at a temperature of 285 ° C. and a pressure of 0.04 MPa was collected on a roll around which a conveyor net installed at a position 20 cm away from the die was wound. The roll was cooled by passing water at 20 ° C.
As a result, a bulky fiber sheet having a weight per unit area of 30 g / m ² having a raised protrusion on the surface at a density of 15 pieces / cm ² was obtained.

On the other hand, a core-sheath type composite fiber (2.0 dtex, fiber length 51 mm) and a rayon fiber (2.0 dtex, fiber length 51 mm) having polyethylene terephthalate (melting point 255 ° C.) as a core component and polyethylene (melting point 123 ° C.) as a sheath component. ) Was mixed at a mass ratio of 25/75, this cotton was web-formed by the card method, and a thermal bond nonwoven fabric was obtained by the hot air air-through method. The basis weight of this nonwoven fabric was 25 g / m ² .

The bulky fiber sheet obtained by the above method and the thermal bond nonwoven fabric were laminated by a hot embossing method to obtain a wiper. In addition, the embossing roll (pressure contact area ratio: 23.7%) used for the lamination had a circular hole with a diameter of 5 mm and a depth of 2 mm arranged in a line at intervals of 5.5 mm. The circular hole array was arranged in a zigzag pattern, and a flat roller was used as the counter roller. Further, the embossing pressure for the treatment was a linear pressure of 45 kg / cm, and the embossing temperature was 135 ° C.
About the obtained wiper, the hair collecting property and sticky dirt wiping property were measured for the raised surface. Further, in order to evaluate the anti-slip property, the raised protrusion portions were engaged with each other, and the tensile shear strength was measured. The results are shown in Table 1.

  The non-woven fabric was formed in the same manner as in Example 1 except that the embossed pattern was laminated using an embossing roll having a round dot shape, a crimp area ratio of 20%, and a distance from a specific dot to the nearest dot of 5.3 mm. Obtained. (Table 1)

A bulky fiber sheet was obtained in the same manner as in Example 1 except that a polypropylene resin having an MFR of 15 g / 10 min was used as a raw material resin for the bulky fiber sheet.
The obtained bulky fiber sheet and the thermal bond nonwoven fabric used in Example 1 were laminated in the same manner as in Example 1 to obtain a wiper. (Table 1)

A bulky fiber sheet obtained in Example 1 was prepared, and then a polystyrene-poly (ethylene / propylene) -polystyrene block copolymer (Kuraray, Septon) was prepared as a thermoplastic elastomer resin, and further self-adhesion prevention was prepared. For this purpose, a polypropylene resin with MFR = 300 was prepared. 40% by mass of the polypropylene resin is added to 60% by mass of the thermoplastic elastomer resin, melt-extruded by an extruder at 300 ° C., and then used with a melt blow spinning device having slits for jetting heated gas on both sides. The polymer was discharged at a rate of 0.5 g per hole, and air heated to 300 ° C. was sprayed at a pressure of 0.04 MPa to make it fine. This fiber stream was collected on a wire mesh belt installed 25 cm below the nozzle, and wound up by a rear winder to obtain an adhesive sheet. The basis weight of the obtained adhesive sheet was 15 g / m ² .
On the other hand, polyester fiber (2.0 dtex, fiber length 51 mm) made of polyethylene terephthalate (melting point 255 ° C.) and rayon fiber (2.0 dtex, fiber length 51 mm) are mixed at a mass ratio of 25/75, and this cotton is carded. And spunlaced nonwoven fabric was obtained by the hydroentanglement method. The basis weight of this spunlace nonwoven fabric was 25 g / m ² .
An adhesive sheet is arranged between the bulky fiber sheet obtained by the above method and the spunlace nonwoven fabric, and these three layers are laminated by a hot embossing method using an embossing roll having the same pattern as in Example 1. I got a wiper. (Table 1)

Comparative Example 1
MFR 600g / 10min polypropylene resin is melt-extruded by an extruder, discharged from a nozzle at a spinning temperature of 285 ° C and a single hole discharge rate of 0.5g / min., And finely blown by high-speed hot air at a temperature of 285 ° C and a pressure of 0.1MPa. The converted fiber stream was placed at a position 20 cm away from the die and collected on a forming conveyor equipped with a suction box on the opposite side of the die nozzle to obtain a melt blown nonwoven fabric. A 20 mesh plain woven stainless wire mesh was attached to the conveyor so as to rotate endlessly.
The obtained melt blown nonwoven fabric and the thermal bond nonwoven fabric used in Example 1 were laminated by the same method as in Example 1 to obtain a wiper.
The surface of the obtained wiper had the same form as a normal melt blown nonwoven fabric, and no raised protrusions were formed. (Table 1)

Comparative Example 2
A wiper was produced in the same manner as in Example 1 except that the embossed dot interval was 1.5 mm.
In the obtained wiper, the raised protrusions on the bulky fiber sheet side surface were crushed, and the wiper had a shape without raising at all. (Table 1)

Comparative Example 3
As a pile yarn, a wiper made of a cut pile fabric (pile height 3.8 mm, pile density 100 pieces / cm ² ) using ultra fine fibers of 0.3 dtex (fiber diameter 2 μm) was prepared, and each physical property was evaluated. . (Table 1)

Sectional drawing which shows an example of the bulky fiber sheet used for this invention.

Explanation of symbols

1: Bulky fiber sheet 2: Brushed protrusion

Claims (5)

A wiper formed by laminating a bulky fiber sheet having a raised protrusion on the surface and a fiber sheet having a smooth surface on the surface, the bulky fiber sheet being substantially composed of continuous fibers, and comprising constituent fibers A wiper characterized in that 50 to 90% are formed by forming two or more fused fiber bundles. The wiper according to claim 1, wherein the raised protrusions have a height of 0.2 to 5 mm and are present at a density of 3 pieces / cm ² or more. The wiper according to claim 1 or 2, wherein a heat-adhesive sheet is disposed between the bulky fiber sheet and the fiber sheet, and three layers are bonded and integrated. The wiper according to any one of claims 1 to 3, wherein the bulky fiber sheet is made of a melt blown nonwoven fabric. The wiper according to claim 3 or 4, wherein the adhesive sheet is made of a thermoplastic elastomer.

Images