JPS6438299A - Pencil - Google Patents
PencilInfo
- Publication number
- JPS6438299A JPS6438299A JP19474687A JP19474687A JPS6438299A JP S6438299 A JPS6438299 A JP S6438299A JP 19474687 A JP19474687 A JP 19474687A JP 19474687 A JP19474687 A JP 19474687A JP S6438299 A JPS6438299 A JP S6438299A
- Authority
- JP
- Japan
- Prior art keywords
- lead body
- shaft
- surface area
- specific surface
- porosity
- 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 improve the strength and the integrating characteristic of a lead body and a shaft by comprising an oil-immersed organic baked lead body as a lead body, and using the lead body having the specified porosity and specific surface area, before the oil-immersion. CONSTITUTION: In a pencil comprising a shaft and a lead body of more than 1.8 mm diameter, inserted into the shaft, the porosity and the specific surface area of an organic baked lead body are variable corresponding to the manufacturing conditions such as the kinds of materials, a blending ratio of the materials, and a programming rate and the maximum temperature in the heat treatment. By properly setting these conditions, the lead body having the proper porosity and specific surface area, can be obtained. On this occasion, the lead body of 30-70% of porosity, and not more than 1.5 of a ratio of a value (S1 ) on the basis of multilayer adsorption theory and a value (S2 ) on the basis of monomolecular adsorption theory (S1 /S2 ), as the specific surface area, is prepared. Whereby not only the bending strength but also the integrating characteristic of the lead body and the shaft, can be improved.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19474687A JPS6438299A (en) | 1987-08-04 | 1987-08-04 | Pencil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP19474687A JPS6438299A (en) | 1987-08-04 | 1987-08-04 | Pencil |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6438299A true JPS6438299A (en) | 1989-02-08 |
Family
ID=16329540
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP19474687A Pending JPS6438299A (en) | 1987-08-04 | 1987-08-04 | Pencil |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6438299A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03142442A (en) * | 1989-10-30 | 1991-06-18 | Fuji Photo Film Co Ltd | Silver halide photographic emulsion |
CN103277833A (en) * | 2013-05-03 | 2013-09-04 | 华中科技大学 | Full premix condensation type wall-hanging stove with oxygen enrichment equipment |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5144027A (en) * | 1974-10-09 | 1976-04-15 | Pentel Kk | ENPITSUSHINNOSEIZOHO |
JPS51129321A (en) * | 1975-04-30 | 1976-11-10 | Pentel Kk | Method of manufacturing pencil lead |
JPS5488424A (en) * | 1977-12-23 | 1979-07-13 | Pentel Kk | Preparation of lead of pencil |
-
1987
- 1987-08-04 JP JP19474687A patent/JPS6438299A/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5144027A (en) * | 1974-10-09 | 1976-04-15 | Pentel Kk | ENPITSUSHINNOSEIZOHO |
JPS51129321A (en) * | 1975-04-30 | 1976-11-10 | Pentel Kk | Method of manufacturing pencil lead |
JPS5488424A (en) * | 1977-12-23 | 1979-07-13 | Pentel Kk | Preparation of lead of pencil |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH03142442A (en) * | 1989-10-30 | 1991-06-18 | Fuji Photo Film Co Ltd | Silver halide photographic emulsion |
CN103277833A (en) * | 2013-05-03 | 2013-09-04 | 华中科技大学 | Full premix condensation type wall-hanging stove with oxygen enrichment equipment |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
AU1660388A (en) | A sustained-release preparation and production thereof | |
CA1251462C (en) | ||
JPS6438299A (en) | Pencil | |
JPS645041A (en) | Manufacture of ceramic body having superconducting circuit pattern | |
JPS5257527A (en) | Monofil compound heater and its manufacturing method | |
ZA792558B (en) | Drip chamber with backflow ball valve | |
EP0172764A3 (en) | Ceramic sintered body | |
JPS51120738A (en) | Optical filter and its manufacturing method | |
JPS6438298A (en) | Pencil | |
JPS5363598A (en) | Manufacturing method of piezo body which contains lead | |
JPS5213485A (en) | Coated adsorbent and process for producing thereof | |
JPS6438297A (en) | Pencil | |
JPS5325279A (en) | Connecting part of graphite electrode | |
DE3464464D1 (en) | Opaque dental porcelain and method of using the same | |
JPS5719035A (en) | Manufacture of adsorbing material | |
Linhart et al. | Materials and Treatment of Gears with Large Modulus | |
JPS6414181A (en) | Production of ceramic material | |
JPS53137055A (en) | Solder | |
JPS51120348A (en) | Multi engaging wn gear | |
ES2008576A6 (en) | Self-degradable coffin mfr. | |
JPS51123005A (en) | Analog presser | |
JPS5693841A (en) | Composite electric contact material | |
JPS5357197A (en) | Production of carbon fiber element | |
JPS6438914A (en) | Filmy ceramic superconducting material | |
Perez | Modification of Surface Properties by Ion Implantation |