JPS5521449A - Contamination-free chalk and its manufacture - Google Patents
Contamination-free chalk and its manufactureInfo
- Publication number
- JPS5521449A JPS5521449A JP9429278A JP9429278A JPS5521449A JP S5521449 A JPS5521449 A JP S5521449A JP 9429278 A JP9429278 A JP 9429278A JP 9429278 A JP9429278 A JP 9429278A JP S5521449 A JPS5521449 A JP S5521449A
- Authority
- JP
- Japan
- Prior art keywords
- chalk
- manufacture
- contamination
- skin
- outer periphery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Abstract
PURPOSE: To manufacture the title chalk capable of preventing hands, fingers, and clothings from contamination during writing operation, by integrally forming a skin on the outer periphery of the chalk.
CONSTITUTION: A high polymeric or inorganic material free of adherence to a blackboard, etc. is stuck to or impregnated in the outer periphery 4 of a chalk 1 (white or colored) having a required shape or length in such a way as to envelop particles 3 at the chalk surface to form a skin 2 in a single step.
COPYRIGHT: (C)1980,JPO&Japio
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9429278A JPS5521449A (en) | 1978-08-01 | 1978-08-01 | Contamination-free chalk and its manufacture |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9429278A JPS5521449A (en) | 1978-08-01 | 1978-08-01 | Contamination-free chalk and its manufacture |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS5521449A true JPS5521449A (en) | 1980-02-15 |
Family
ID=14106176
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9429278A Pending JPS5521449A (en) | 1978-08-01 | 1978-08-01 | Contamination-free chalk and its manufacture |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS5521449A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60139768A (en) * | 1983-12-28 | 1985-07-24 | Arupaa Kk | Chalk and production thereof |
-
1978
- 1978-08-01 JP JP9429278A patent/JPS5521449A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS60139768A (en) * | 1983-12-28 | 1985-07-24 | Arupaa Kk | Chalk and production thereof |
JPH0139704B2 (en) * | 1983-12-28 | 1989-08-23 | Arupaa Kk |
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