JPH0593896U - Eraser for whiteboard - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain an eraser for a whiteboard, which has a strong erasing power and an ability to retain eraser dust, and exhibits a good erasing performance even for a handwriting left for a long period of time. [Structure] A base cloth having a wiping portion is fixed to a box-shaped base. The wiping part has a length of 3 to 7 mm and a thickness of 5 to 4
Fine fibers of 0 danil, length 3 to 7 mm, thickness 40 to
A 100 denier thick fiber is mixed and raised on the base fabric, and as the fiber, synthetic fiber such as nylon can be adopted.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an eraser used for writing boards such as whiteboards and electronic blackboards. More specifically, it relates to an eraser for whiteboard, which has excellent erasability of handwriting and retention of eraser dust.

[0002]

[Prior Art]

 Writing boards such as whiteboards and electronic blackboards have been widely used in place of conventional painted blackboards. As a marker for these writing boards, a so-called whiteboard marker using an ink composed of a pigment, a dispersant, a resin, a solvent and a release agent is used.

The handwriting with the whiteboard marker is composed of a coloring layer containing a pigment and a resin as main components, and an oil layer made of a release agent formed between the coloring layer and the writing plate. The handwriting can be removed from the writing board by wiping it off with a piece of paper or cloth. An eraser for whiteboard is known as an eraser for this handwriting. As a conventional wiping part for an eraser for a whiteboard, many proposals have been made using a plain woven fabric such as a cloth, a pile woven fabric, a sponge or a non-woven fabric.

[0004]

[Problems to be solved by the device]

 It is the deterioration of the erasing performance with time. The handwriting of the marker for the whiteboard is finely crushed to become erased residue when erased. This eraser dust is retained inside the eraser wiping portion. However, if the eraser retention capacity is small, the eraser wiping part will be clogged in a short period of time, and the erasing performance will deteriorate.

If the above handwriting is left for a long time, the release agent of the oil layer evaporates, and the colored layer adheres to the writing plate and solidifies. For this reason, handwriting left for a long period of time does not peel off with a light force as compared with immediately after writing, and when the same eraser for whiteboard is used, the eraser's erasing performance deteriorates relatively.

[0006]

[Means for Solving the Problems]

 The present invention is intended to solve the above-mentioned conventional problems and to provide an eraser for a whiteboard, which has excellent erasability and erasable dust retention over a long period of time. The gist is an eraser for whiteboard, which is characterized by being composed of fibers having different thicknesses.

Hereinafter, the present invention will be described in detail. 1 and 2 are schematic views showing an embodiment of an eraser for a whiteboard according to the present invention. Reference numeral 1 is a wiping unit. This wiping part 1 is made by raising fibers 2 having different diameters to a base cloth 3, and this base cloth 3 is fixed to a base 4 of an eraser.

As the fibers 2 forming the wiping unit 1, fibers such as nylon, polyester, rayon, Teflon, and acrylic can be used. The term fiber as used herein includes single yarn and twisted yarn. To raise the fibers, an adhesive is applied to the surface of the base fabric, and a single yarn (mainly using short fibers) is mechanically sprayed or sprinkled on the surface of the base fabric to form a mechanical flocking method. Alternatively, an electrostatic flocking method in which a base fabric with an adhesive applied to the surface is placed in a high-voltage electrostatic field, and single yarns (mainly using short fibers) fly up and are planted on the surface of the base fabric in this electric field It is possible to adopt a method such as pile weaving in which other fibers are woven into the base fabric at a predetermined pitch. In particular, the electrostatic flocking method is preferable because it has a higher adhesive strength, a higher density, and a longer fiber length than the mechanical flocking method.

The fibers 2 forming the wiping unit 1 need to have fibers having different thicknesses mixed therein. This is because the fibers with a small diameter enhance the ability to hold the eraser debris in the wiping part, prevent the occurrence of clogging, and the fibers with a large diameter give a strong rubbing force to the wiping part, thus exhibiting a high erasability. This is to prevent deterioration of the erasing performance. When a single yarn is used as the fiber, it is preferable to use a thin fiber having a denier of 5 to 40 and a thick fiber having a denier of 40 to 100 denier. This is because fibers having a denier of less than 5 have poor napping property, and fibers having a denier of more than 100 denier may damage the surface of the board.

The thin fiber and the thick fiber may each have a single diameter or a plurality of diameters. The mixing ratio of the thin fibers and the thick fibers is preferably 60 to 97% by weight of the thin fibers and 3 to 40% by weight of the thick fibers. This depends on the material and length of the fiber used, but if the thick fiber is less than 3% by weight, it may be difficult to apply strong rubbing force to the wiping part, and the erasability of handwriting left for a long time may be poor. If the thick fibers exceed 40% by weight, the gap between the fibers becomes large, the eraser dust cannot be retained with sufficient strength, and the touch at the time of erasing tends to be poor.

Further, the length of the fibers of the wiping portion varies depending on the material and thickness of the fibers used, but is preferably 3 to 7 mm from the base cloth surface. This is because when the length is 3 mm or less, the eraser dust retention property is often insufficient, and when the length is 7 mm or more, nap cannot be satisfactorily raised. Further, it is not always necessary that all fibers have the same length, and thick fibers may be made shorter than thin fibers, and vice versa. You may change the length inside.

The base fabric 3 is for fixing the fibers 2 and is selected according to the type and material of the fibers to be used, but it may be a woven fabric such as cotton or a non-woven fabric such as polyester or nylon. Is also good.

The base 4 is the main body of the eraser for whiteboard, and is mainly used as a grip portion. As the material, various materials such as wood and plastic can be used, and not only the shape thereof but also the shape of a flat ellipse can be adopted.

It is preferable that a soft substance such as sponge or felt be interposed between the base cloth 3 and the base material 4 to adhere to each other, because the touch at the time of erasing becomes smooth.

[0015]

[Action]

 Since the whiteboard eraser of the present invention has the above-mentioned configuration, it has a strong erasing ability due to the thick fibers and a sufficient eraser retention ability due to the thin fibers, so that the erasing performance deteriorates over time. Hard to do.

[0016]

【Example】

 Hereinafter, the present invention will be described in more detail with reference to embodiments. Example 1 Fine fiber (thickness 20 denier, length 5 mm, made of nylon) 70% by weight Thick fiber (thickness 50 denier, length 5 mm, made of nylon) 30% by weight Electrostatic type of the above fiber on a cotton base cloth Brushing was performed by a flocking method to form a wiping portion. Further, the cotton base cloth on which the wiping portion was formed was adhered to a polypropylene base material with an adhesive to obtain an eraser for a whiteboard.

Example 2 Fine fiber (thickness 20 denier, length 4.5 mm, made of nylon) 95% by weight Thick fiber (thickness 50 denier, length 4.5 mm, made of nylon) 5% by weight Using the above fibers An eraser for a whiteboard was obtained in the same manner as in Example 1.

Comparative Example 1 An eraser for whiteboard was obtained in the same manner as in Example 1, except that only fibers made of nylon having a thickness of 50 denier and a length of 5 mm were used as the fibers.

Comparative Example 2 An eraser for whiteboard was obtained in the same manner as in Example 1 except that only nylon having a thickness of 20 denier and a length of 5 mm was used as the fiber in Example 1.

An erasability test was conducted using the whiteboard eraser obtained in Examples 1 and 2 and Comparative Examples 1 and 2. The results are shown in Table 1.

[0021]

[Table 1]

Erasability test: Write a character on the entire surface of a whiteboard (made by Pentel Co., Ltd.) with a marker for whiteboard (made by Pentel Co., Ltd.), and hold the eraser for whiteboard by hand to erase it. Repeatedly, the erasure mark and the amount of erasable dust retained by the eraser were observed.

Erasability: The erased state of the handwriting immediately after writing was observed. Erasability of handwriting over time: The erasing state was observed for handwriting left at room temperature for one month after writing. ◎: Handwriting can be completely erased with one round of eraser ○: Handwriting can be completely erased with two to four rounds of eraser △: Handwriting cannot be completely erased with more than 5 rounds of eraser

Erasable residue retention: The erasability test (erasing immediately after writing) was repeated 100 times to measure the weight increase of the eraser.

[0025]

[Effect of the device]

 As described above in detail, the eraser for whiteboard according to the present invention is an eraser for whiteboard which is excellent not only in normal erasing performance but also in erasability of handwriting over time and retention of erased dust.

[Brief description of drawings]

FIG. 1 is a schematic diagram showing an embodiment of the present invention.

FIG. 2 is an enlarged view of a main part of FIG.

[Explanation of symbols]

 1 Wiping part 2 Fiber 3 Base cloth 4 Base

Claims (1)

[Scope of utility model registration request] 1. An eraser for a whiteboard, wherein the wiping portion is made of napped fibers having different thicknesses.