JPS6438299A - Pencil - Google Patents

Pencil

Info

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
Application number
JP19474687A
Other languages
Japanese (ja)
Inventor
Hitoshi Fujimagari
Yoshiaki Abe
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Pentel Co Ltd
Original Assignee
Pentel Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Pentel Co Ltd filed Critical Pentel Co Ltd
Priority to JP19474687A priority Critical patent/JPS6438299A/en
Publication of JPS6438299A publication Critical patent/JPS6438299A/en
Pending legal-status Critical Current

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.
JP19474687A 1987-08-04 1987-08-04 Pencil Pending JPS6438299A (en)

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)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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

Patent Citations (3)

* Cited by examiner, † Cited by third party
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)

* Cited by examiner, † Cited by third party
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