JP3033859B2 - Nonwoven fabric for wiper and wiper for whiteboard using the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wiper nonwoven fabric which can wipe off oil films and the like, is excellent in retaining dust removed, and can be used for a long period of time.
It can be used for automobiles, OA equipment such as copy machines, furniture, and the like.

[0002]

2. Description of the Related Art Compared with a conventionally used blackboard, a whiteboard is less likely to generate dust and does not stain hands.
It is becoming popular. As wipers for removing the ink adhering to the white board, there were a base material in which fibers were electrically planted with fibers, a pile fabric, and the like, but none of the wipers for white boards had sufficient performance.

For example, Japanese Utility Model Laid-Open No. 57-24099 discloses a wiper in which fibers are electro-flocked to a foam, and this wiper can remove ink adhering to a white board, but leaves an oil film. There was a disadvantage that it would. Also, this wiper has regular fibers,
Since the hairs were densely planted, the wiped ink could not be held, clogging with the ink occurred immediately, and it was difficult to use the ink for a long period of time. Further, there is a disadvantage that the ink is repelled by the elasticity of the planted fibers and the surroundings are soiled.

On the other hand, Japanese Unexamined Patent Publication No. 60-8099 discloses a whiteboard wiper made of a pile fabric. However, the wiper disclosed herein also has an oil film removal property,
There has been a problem in terms of long-term use and retention of the removed ink.

[0005] Japanese Patent Publication No. 59-30419 discloses a wiper using ultra-fine fibers. However, since the wiper is in a high-density state like a woven fabric, there is no portion for holding removed dust and the like. Due to poor retention, it could not be used for a long time.

[0006]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has a superior non-woven fabric for a wiper in terms of oil film removability, long-term use, and retention of removed dust and the like. , And a whiteboard wiper using the same.

[0007]

According to the present invention, there is provided a nonwoven fabric for a wiper having an apparent density of 0.04 g / cm ³ or less of a nonwoven fabric containing ultrafine fibers.

If the above-mentioned nonwoven fabric for a wiper is attached to the outer surface of the pad, it can be used as a wiper for a whiteboard.

[0009]

The nonwoven fabric for a wiper according to the present invention is a nonwoven fabric containing ultrafine fibers, and has an apparent density of 0.04 g / cm ³ or less, so that ink, dust, oil film, etc. (hereinafter collectively referred to as dust). It has excellent removability and retention, and can be used for a long time.

First, since the nonwoven fabric for a wiper of the present invention contains ultrafine fibers, it has excellent oil film removal properties. Since the ultrafine fiber of the present invention has a fiber diameter of about one tenth as compared with a general fiber, it is possible to remove a fine fiber such as an oil film which cannot be scraped off by a normal fiber. Further, since the ultrafine fibers obtained by dividing a fiber having a substantially circular cross-sectional shape have a cross-sectional shape having a sharp angle, it is easier to wipe off the oil film.

Second, since the apparent density of the nonwoven fabric for a wiper of the present invention is 0.04 g / cm ³ or less, it can be used for a long time without clogging. In other words, the wiper nonwoven fabric having the above apparent density is bulky and has many spaces,
When this non-woven fabric for wipers is used, not only the ultra-fine fibers on the surface of the non-woven fabric for wipers but also the ultra-fine fibers inside the non-woven fabric for wipers can come into contact with the object to be cleaned. When the nonwoven fabric for cleaning leaves the object to be cleaned, the scraped dust can be stored together in the internal space of the nonwoven fabric for wipers,
The removed dust hardly accumulates on the surface of the nonwoven fabric for the wiper, and can be used for a long time.

Further, the nonwoven fabric for a wiper has a structure in which the microfibers inside are covered by microfibers on the surface, and the space formed by the microfibers is very small, so that the wiped dust hardly moves. Also, since the wiped dust is not scattered, the holding property of the dust is excellent.

As described above, the nonwoven fabric for a wiper of the present invention contains ultra-fine fibers and has an apparent density of 0.04 g / cm ³ or less. It can be used for a period.

The ultrafine fiber of the present invention is a fiber having a denier of about 0.04 to 0.5, and is obtained by dividing a dividable fiber comprising two or more resins (hereinafter referred to as a split fiber) by a chemical treatment or the like. According to this method, since the thickness does not change much, a nonwoven fabric for a wiper having a desired apparent density can be easily obtained.

The split fibers giving such ultrafine fibers are 2
Fiber composed of more than two components, polyamide resin and polyester resin, polyamide resin and polyolefin resin, polyamide resin and polyacrylonitrile polymer resin, polyester resin and polyolefin resin, polyester resin and polyacrylonitrile resin, polyolefin Examples of the combination of the resin and the polyacrylonitrile polymer resin include, but are not limited to, these.

The resin components of the split fibers may be arranged in any manner, but a chrysanthemum-shaped fiber having a cross-sectional shape in which one component is radially arranged between other components, and one component is composed of islands Examples are sea-island fibers having a cross-sectional shape dispersed in a shape, and bimetallic fibers having a cross-sectional shape in which different components are alternately laminated in layers.

If the composition ratio of the ultrafine fibers in the nonwoven fabric for a wiper of the present invention is lower than 20% by weight, the oil film removal performance, which is the function of the ultrafine fibers, is reduced, and conversely, the composition ratio of the ultrafine fibers is 90% by weight. %, The morphological stability and strength of the nonwoven fabric for a wiper decrease, so that the composition ratio of the ultrafine fibers is 20 to 90% by weight, more preferably 30 to 80% by weight.

When a fiber having a denier of 0.5 denier or more is used in addition to the ultrafine fiber, the fiber acts as a backbone of the wiper nonwoven fabric and imparts strength and dimensional stability to the wiper nonwoven fabric. For example, regenerated fibers such as cellulose fibers,
Animal fiber such as silk and wool, semi-synthetic fiber such as acetate fiber, nylon fiber, vinylon fiber, acrylic fiber, polyester fiber, polyvinylidene chloride fiber, polyvinyl chloride fiber, polyurethane fiber, polyethylene fiber, polypropylene fiber, etc. Synthetic fibers can be used.

In the case where a nonwoven fabric for a wiper is obtained by forming a fiber web containing heat-fusible fibers and then applying heat without pressing to fuse the heat-fusible fibers, a non-woven fabric for a wiper is obtained. A heat-fusible fiber consisting of a non-fusible component such as a side-by-side type, a core-sheath type, or other composite type heat-fusible fibers may be used. Since it is obtained, it can be used more preferably.
The melting point of the fusion component is preferably lower than the melting point of the component of the ultrafine fiber by 10 ° C. or more so as not to fuse the ultrafine fiber.

As components of the composite type heat-fusible fiber,
6 nylon / polyethylene, polypropylene / polyethylene, polypropylene / ethylene-vinyl acetate copolymer, polyester / polypropylene, polyester / polyethylene, 6 nylon / 66 nylon, high melting polyester / low melting polyester, high density polyethylene / low density polyethylene, etc. Combinations can be exemplified, but 2
It is not limited to components.

When the heat-fusible fiber exceeds 80% by weight of the fiber web, the wiping property is reduced due to a decrease in the proportion of the ultrafine fibers. On the contrary, when the heat-fusible fiber is less than 10% by weight, a sufficient form by fusion is obtained. Since stability and strength cannot be obtained, it is preferable to mix 10 to 80% by weight, more preferably 20 to 70% by weight, when the strength and dimensional stability are imparted by the heat-fusible fiber.

The nonwoven fabric for a wiper of the present invention is formed by splitting fibers, heat fusible fibers, or a mixture of the above fibers, and then forming a fiber web by a card method or an air lay method. After bonding with the fibers, the divided fibers are obtained by chemical treatment.

When the fiber web is formed by the card method, the fiber may be oriented in any direction. However, in the case of a fiber web oriented so that the fibers intersect with each other, the fibers may be oriented in all directions. In the case of a fiber web oriented in one direction, it shows excellent strength in the orientation direction, and if the fiber web oriented in a cross direction and the fiber web oriented in one direction are laminated, A fiber web with better strength is obtained.

Thereafter, the obtained fiber web is fused with a binder and / or a heat-fusible fiber,
The fibers are bonded together.

Since the binding by the binder mainly occurs at the intersections of the fibers, the shape is hardly changed even if the ultrafine fibers are formed by chemical treatment after the binding by the binder. A nonwoven fabric for a wiper having a high density can be obtained. In addition, the use of a binder also provides strength enough to withstand frictional resistance when used as a wiper.

In the case where the heat fusible fibers are fused and bonded, the same effect as in the case where the fibers are bonded with a binder is produced since the fusion is mainly performed at the intersections of the fibers.

When the fibers are bonded to each other by the binder, an acrylate type, an ethylene-vinyl acetate copolymer type, a polyvinyl acetate type, a polyvinyl chloride type, a synthetic rubber type, a urethane type, a polyester type, or a binder of these binders is used. A self-crosslinking type can be exemplified, but the present invention is not limited thereto.

The method of applying the binder to the fiber web as described above may be any method as long as the apparent density of the present invention is achieved, and is not limited. According to the spray method of spraying in the form of a mist, it is not necessary to apply pressure to the fiber web, so that the thickness does not change and a nonwoven fabric for a wiper having a desired apparent density can be easily obtained. In addition, according to this spray method, since the binder is applied in the form of a mist, there is almost no excess binder, and the applied binder is more likely to exert surface tension, and moves to the intersection of physically stable fibers. As a result, the strength is high enough to withstand the frictional resistance.

If an excessive amount of binder is applied to the fiber web, the chemical treatment for splitting the split fibers cannot be performed sufficiently. Therefore, the binder is not more than 30% by weight, more preferably 20% by weight of the nonwoven fabric for wiper. It is better to do the following.

On the other hand, when the heat-fusible fibers are fused to bond the fibers together, if only heat is applied without pressing, the fibers are fused at the intersections of the fibers, which is different from the case where a binder is used. Similar effects can be obtained.

The fiber web bound by the binder and / or the heat-fusible fiber is subjected to a chemical treatment or the like, whereby the split fibers are split to obtain a nonwoven fabric for a wiper containing ultrafine fibers.

Examples of the chemical treatment in the present invention include a dividing method in which one component of the divided fiber is dissolved and removed with a solvent or the like, and a dividing method by swelling and shrinking by applying a swelling agent. In addition, according to the latter dividing method, the apparent density is more easily adjusted, and the number of constituent components of the divided fiber does not decrease as in the case where one component is dissolved and removed with a solvent, so that the wiping property by the ultrafine fiber also decreases. In addition, since the component to be removed does not fill the internal space of the nonwoven fabric for a wiper, the dust retention is not reduced, which is a more preferable dividing method.

In the latter method, in which a swelling agent is acted to cause swelling and shrinkage to be divided, it is necessary to appropriately select a swelling agent depending on the constituent components of the split fibers. For example, if the split fiber contains a polyamide component, benzyl alcohol, phenol, formic acid, acetic acid and the like can be used.If the polyacrylonitrile polymer component is contained, dimethylformamide and the like can be used. When a polyolefin component is contained, xylene or the like can be used. If the fiber web is dipped in these swelling agents, the split fibers are split.

When the nonwoven fabric for a wiper obtained in this manner has an apparent density of more than 0.04 g / cm ³ , it has no bulkiness and has a small space, so that it cannot retain the removed dust and scatters. Since it cannot be used for a long period of time, the apparent density is preferably 0.04 g / cm ³ or less, more preferably 0.02 g / cm ³ or less.

[0035] Conversely, when the apparent density is less than 0.005 g / cm ^3, the shape stability is poor, it is not possible to use for a long time because there is no strength, 0.005 g / cm ³ or more The apparent density is preferably

As described above, the nonwoven fabric for a wiper according to the present invention is excellent in wiping off an oil film because it contains ultrafine fibers, and excellent in dust retention because it has an apparent density of 0.04 g / cm ³ or less.
Can be used for a long time.

The nonwoven fabric for a wiper of the present invention is used for whiteboard wipers, for wiping glasses, for wiping windows of automobiles and houses, for wiping glass of OA equipment such as copiers, for lenses of optical equipment such as cameras, for wiping fingerprints of furniture, pianos, etc. , But is not limited thereto.

The case where the wiper nonwoven fabric 1 of the present invention is used for a whiteboard will be described. As shown in FIG. 1, the wiper nonwoven fabric 1 is mounted on the outer surface of the pad 2. The mounting method is such as bonding with an adhesive,
Although not particularly limited, if the wiper nonwoven fabric 1 can be sandwiched between the pad fixture 3 and the pad 2, not only mounting but also replacement of the wiper nonwoven fabric 1 can be easily performed.

The pad 2 can be made of an elastic foam such as styrene or urethane, a felt, or the like. When such an elastic pad 2 is used, the ink is removed by pressing against the white board. At this time, the hand pressure is evenly dispersed, and the whiteboard and the wiper nonwoven fabric 1 are easily adhered to each other by moderate elasticity, so that the ink on the whiteboard can be effectively removed.

The shape of the pad 2 is not particularly limited, but may be a generally used rectangular parallelepiped type, a kamaboko type, or the like.

The pad fixing device 3 of the present invention only needs to be a rigid synthetic resin, and it is easy to fix the nonwoven fabric 1 for a wiper, and it is easy to apply force. Examples of such a synthetic resin include an acrylic resin, a vinyl chloride resin, a phenol resin, and a melamine resin.

Examples of the present invention will be described below, but the present invention is not limited to the following examples.

[0043]

【Example】

(Example 1) In a fiber cross section, 40% by weight of 2-denier 8-split chrysanthemum split fibers in which a polyamide component is radially arranged between polyester components and 60% by weight of 6-denier polyester fibers were mixed. The fiber blended in the above mixing ratio was laminated by a carding machine with a fiber web oriented in one direction and a fiber web oriented so as to intersect.
the laminated fiber web g / m ^2, by 12 g / m ² to impart a dry weight by spraying the acrylic emulsion binder, bound the fibers. The bonded fiber thus obtained was immersed in a benzyl alcohol bath to split the split fiber, and the basis weight was 60 g / m ² and the thickness was 3
mm and an apparent density of 0.02 g / cm ³ were obtained.

The nonwoven fabric 1 for a wiper was wound around a pad 2 of a styrene foam and fixed to a pad fixture 3 of an acrylic resin to obtain a wiper 4 for a white board. When this whiteboard wiper 4 was used for wiping a whiteboard, it was excellent, with no oil film remaining on the wiper and no scatter of the wiped ink.

[0045] (Example 2) basis weight in the same manner as in Example 1 except for applying the binder of 1 m ² per 18g in laminated fiber web 42 g / m ^2, a basis weight 60 g / m ^2, thickness 2.5 mm,
A nonwoven fabric 1 for wipers having an apparent density of 0.024 g / cm ³ was obtained.

When the nonwoven fabric 1 for a wiper prepared in the same manner as in Example 1 was used for wiping a whiteboard, the wiper 4 for a whiteboard had almost no residual oil film, and the wiped ink did not scatter. Was.

Example 3 The same split fiber as in Example 1 was used for 7
A nonwoven fabric 1 for a wiper was obtained in exactly the same manner as in Example 1 except that 0% by weight and 30% by weight of polyester fiber were used. The thus obtained nonwoven fabric for wiper 1 had a basis weight of 60 g / m ² , a thickness of 3 mm, and an apparent density of 0.02 g / cm ³ .

Using this nonwoven fabric 1 for a wiper, a wiper 4 for a whiteboard was prepared in the same manner as in Example 1.
When used for wiping a white board, the morphological stability and strength were slightly inferior to those of Example 1, but the wiping of the oil film and the retention of the wiped ink were more excellent.

(Comparative Example 1) When a binder was applied by spraying to a laminated fiber web having a basis weight of 48 g / m ² and obtained in the same manner as in Example 1, pressure was applied to apply a binder weight of 60 g / m ² and a thickness of 1 Non-woven fabric 1 for wipers with a thickness of 0.2 mm and an apparent density of 0.05 g / cm ³
I got

When the nonwoven fabric 1 for a wiper prepared in the same manner as in Example 1 was used for wiping a whiteboard, the wiped ink scattered, although no oil film remained on the whiteboard. It clogged immediately and could not be used for a long time.

Example 4 The same split fiber as in Example 1 was used for 4
30% by weight of polyester fiber, 30% by weight of polyester fiber, 30% by weight of core-in-sheath composite fiber composed of high melting point polyester (melting point: 265 ° C.)-Low melting point polyester (melting point: 120 ° C.) of 3 denier A laminated fiber web having a basis weight of 60 g / m ² was formed in exactly the same manner as in Example 1. The laminated fiber web is passed through a dryer at 130 ° C. without pressing to fuse the low-melting polyester component, and then subjected to a chemical treatment to give a basis weight of 60 g / m ² and a thickness of 3 g / m ² .
mm and an apparent density of 0.02 g / cm ³ were obtained.

When the nonwoven fabric 1 for a wiper was wiped with a whiteboard wiper 4 prepared in the same manner as in Example 1, the whiteboard was wiped off. As a result, no oil film was left behind and the wiped ink was not scattered. .

Example 5 A binder was applied to a laminated fiber web having a basis weight of 48 g / m ² obtained in the same manner as in Example 1 by a spray method, and the basis weight was 60 g / m ² , the thickness was 1.5 mm, and the apparent density was 50%. 0.
A nonwoven fabric 1 for a wiper of 04 g / cm ³ was obtained.

(Comparative Example 2) The same polyester fiber as used in Example 1 was used (100% polyester fiber), and the weight per unit area was obtained in the same manner to give a weight of 48 g / m ^2.
A binder is applied to the laminated fiber web by a spray method,
A nonwoven fabric 1 for a wiper having a basis weight of 60 g / m ² , a thickness of 2.0 mm, and an apparent density of 0.03 g / cm ³ was obtained.

(Wipeability Test) A 0.03 mm-thick carbon black layer (D232, manufactured by Xerox Corporation) is uniformly formed on the surface of an OHP film (VF-1, manufactured by KOKUYO Corporation). The carbon black of this OHP film was used as the nonwoven fabric 1 for wipers of Examples 1 and 5 and Comparative Examples 1 and 2.
Each of them was subjected to a single reciprocation at 12.5 cm with a load of 50 g / cm ² , and the wiping was evaluated as one time, and the wiping performance after 1 time and 10 times was evaluated. Table 1 shows the results of the wiping test.

[0056]

[Table 1]

The wiping property was evaluated based on the following criteria. 1st grade: hardly wiped off 2nd grade: some vertical streaks remain 3rd grade: some streaks remain 4th grade: almost no longitudinal streaks 5th grade: no longitudinal streaks at all

(Durability test) An OHP film having the same carbon black layer as the wiping test was applied to the nonwoven fabrics 1 for wipers of Examples 1 and 5 and Comparative Examples 1 and ² by applying a load of 50 g / cm ² , respectively. 12.5cm one way per OHP film
To make one reciprocation to wipe off the OHP film having 10 carbon black layers. Then, the wiping property of the tenth OHP film was determined based on the same evaluation criteria as in the wiping property test. Table 1 shows the results of the durability test.

(Oil film removal test) Grease (T-grease, APIEZON) was applied to one surface (4.5 cm × 1.0 cm) of a quartz cell of an ultraviolet spectrophotometer (UV-3100S, manufactured by Shimadzu Corporation). ) Is applied uniformly. And
The light transmittance (%) at 600 nm is measured. Thereafter, a load of 45 g / cm ² was applied to the quartz cell, and the nonwoven fabric 1 for wipers of Examples 1 and 5 and Comparative Examples 1 and 2 was set to 10 cm.
After moving and wiping the grease, the light transmittance (%) at 600 nm is measured, and the light transmittance (%) before and after the grease wiping is compared. The results are also shown in Table 1.

[0060]

The nonwoven fabric for a wiper according to the present invention has an excellent wiping property that can wipe off an oil film or the like which could not be wiped off conventionally because it contains ultrafine fibers.

Since the apparent density of the nonwoven fabric for wiper of the present invention is 0.04 g / cm ³ or less, the removed dust can be retained inside the nonwoven fabric for wiper.
Since clogging of dust does not occur, it can be used for a long time. In addition, when the wiper non-woven fabric is pressed against the object to be cleaned, the ultrafine fibers inside the wiper non-woven fabric can be wiped out, and the scraped dust can be stored in the internal space of the wiper non-woven fabric, thereby further removing the oil film. Excellent in properties and dust retention, and can be used for a long time.

Further, since the ultrafine fibers inside the nonwoven fabric for the wiper are covered with the ultrafine fibers on the surface to form a fine space, the wiped dust cannot move and the wiped dust does not scatter.

When the nonwoven fabric for a wiper of the present invention is mounted on the outer surface of the pad, it can be used as a wiper for a whiteboard which cannot be wiped off with a conventional wiper for a whiteboard and which can also remove an oil film.

[Brief description of the drawings]

FIG. 1 is a perspective view when a nonwoven fabric for a wiper of the present invention is used for a whiteboard.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Nonwoven fabric for wipers 2 Pad 3 Pad fixing device 4 Wiper for whiteboard

Claims (2)

(57) [Claims] 1. The apparent density of a nonwoven fabric containing ultrafine fibers is 0.5.
A non-woven fabric for a wiper, which is not more than 04 g / cm ³ . 2. A whiteboard wiper, wherein the wiper nonwoven fabric 1 according to claim 1 is mounted on an outer surface of a pad 2.