CN2340624Y

CN2340624Y - Easily writing and erasing durable blackboard

Info

Publication number: CN2340624Y
Application number: CN 98229692
Authority: CN
Inventors: 霍仁德
Original assignee: Individual
Current assignee: Individual
Priority date: 1998-10-16
Filing date: 1998-10-16
Publication date: 1999-09-29
Anticipated expiration: 2008-10-16

Abstract

The utility model relates to an easily writing and erasing durable blackboard, which comprises a base layer and is characterized in that the base layer is glued with a writing layer which is mixed and solidified by black carbon powder, coal powder, coal gangue powder, adhesive agent and firm agent. The utility model has the advantages that the surface of the writing layer is easy for writing, pen powder is easy to be erased, the writing hand feeling of the writing surface is good, the writing flavor can be written, the pen powder can not fall in the process of writing, chalks are saved, the writing layer is thicker and is wearable, the writing layer can not fall off, the service life is long, the easily writing and erasing durable blackboard is not required to be serviced for many years, the cost is low and the production is easy. Material used for making the writing layer is convenient to be obtained and the range of the base material is wide. So the surface of the utility model can be made according to local conditions.

Description

The durable blackboard of easy-to-write and erasable

The utility model relates to teaching aid, the durable blackboard of particularly a kind of easy-to-write and erasable.

Teaching of the prior art roughly is divided into two kinds with blackboard, and a kind of is to apply pitch-dark and blackboard that constitute, and a kind of is the frosted glass blackboard; The former shortcoming be that pitch-dark layer is thinner, the time will come off soon, the writing property of enamelled coating that has is relatively poor, hard slightly chalk is write difficulty, and has the deficiency that is difficult for wiping the chalk powder; Though the latter is easy to write, there is the cost height, frangible, be difficult for wiping the chalk powder equally.

It is a kind of with low cost that the purpose of this utility model is to provide, the durable blackboard of the easy-to-write and erasable of long service life.

Above-mentioned purpose of the present utility model is to realize by such technical scheme, it is the durable blackboard of a kind of easy-to-write and erasable, comprise basic unit, it is characterized in that: solidify the writing layer that forms being stained with in the basic unit by behind carbon black powder, coal dust, colliery powder mixing bonding agent and strong dose.

Accompanying drawing is that structure of the present utility model is further specified by accompanying drawing.

Accompanying drawing is a structure cutaway view of the present utility model.

Referring to accompanying drawing: the durable blackboard of easy-to-write and erasable among the figure, comprise basic unit 1, it is characterized in that: solidify the writing layer 2 that forms being stained with in the basic unit by behind carbon black powder, coal dust, colliery powder mixing bonding agent and strong dose.Described writing layer 2 thickness are 3～10mm.

The utility model is owing to the advantage that described structure has is:

1. the aspect of writing was both easily write, and a powder is easily wiped again;

2. the writing surface good hand touch of writing can be write out the local flavor of wieling the pen;

3. dry linting not in the writing process is saved chalk;

4. writing layer is thicker, and rub resistance can not come off, and long service life can not keeped in repair for many years;

5. cost is low, makes easily, conveniently is easy to get owing to make the material of writing layer, and the scope of base material is wide, the making blackboard surface that can suit measures to local conditions.

Claims

1. the durable blackboard of easy-to-write and erasable comprises basic unit (1), it is characterized in that: solidify the writing layer (2) that forms being stained with in the basic unit by behind carbon black powder, coal dust, colliery powder mixing bonding agent and strong dose.

2. the durable blackboard of easy-to-write and erasable according to claim 1 is characterized in that: described writing layer (2) thickness is 3～10mm.