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Special lead of pencil

A kind of pencil lead and special technology, applied in pencil lead, household utensils, application and other directions, can solve the problems of small core tip, easy to break, etc., to achieve the effect of not easy to break and ensure normal use

Active Publication Date: 2009-01-07
中国第一铅笔泗洪有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the pencil lead with higher concentration is often softer, the force on the core tip is small, and it is easy to break, that is, the concentration of the pencil core and the force on the core tip are two performance indicators of reverse strain.

Method used

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  • Special lead of pencil

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: a kind of special pencil lead, it is composed of (weight ratio):

[0017] 194 graphite 73

[0018] Liyang Clay 14

[0019] tallow 6

[0020] Paraffin 7

[0021] The special pencil lead prepared according to this formula has a Knoop hardness of 18.0-20.0HK, a core force of 11.0N, and a concentration (absorbance) of 0.43. This index is better than the 3B concentration of the pencil standard and the Knoop hardness of HB, which is in line with the expected effect of the present invention.

Embodiment 2

[0022] Embodiment 2: a kind of special pencil lead, it is composed of (weight ratio):

[0023] 194 graphite 72

[0024] Liyang Clay 17

[0025] tallow 5

[0026] Paraffin 6

[0027] The special pencil lead prepared according to this formula has a Knoop hardness of 19.0-22.0HK, a force of 12.0N on the tip of the core, and a concentration (absorbance) of 0.42. This index is better than the 3B concentration of pencil standard, and the Knoop hardness of HB, meets the expected effect of the present invention

Embodiment 3

[0028] Embodiment 3: a kind of special pencil lead, it is composed of (weight ratio):

[0029] 194 graphite 70

[0030] Liyang Clay 19

[0031] tallow 5

[0032] Paraffin 6

[0033] The special pencil lead prepared according to this formula has a Knoop hardness of 20.0-23.0HK, a force of 13.0N on the tip of the core, and a concentration (absorbance) of 0.40. This index is equivalent to the 3B concentration of the pencil standard and the Knoop hardness of HB, has thick and hard characteristics, and conforms to the expected effect of the present invention.

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Abstract

The invention relates to single-component special pencil lead which is prepared with graphite as tinctorial strength, clay as binder, one among tallow acid oil and paraffin or more than one mixture as colorant. Because the prescription is reasonable, the invention has quite high hardness while making sure the pencil lead has quite high concentration. Because of the high concentration, the mark written by the pencil lead forms quite large contrast with the background, so that the mark written by the pencil lead can be still easily identified on special occasions with poor visibility; but the special pencil lead has larger core stress than that of the pencil lead with equivalent concentration under standard ratio, so that the pencil lead is not easy to be broken and can be used normally.

Description

Technical field [0001] The present invention relates to a writing material characterized by its physical properties, and more particularly to a hard and thick specialty pencil lead. Background technique [0002] According to the pencil industry standard QB / T 2774-2006, general conventional writing pencils are divided into 6B, 5B, 4B, 3B, 2B, B, HB, F, H according to the Snoop hardness (HK) of the material used for the refill. , 2H, 3H, 4H, 5H, 6H fourteen types, the softest 6B is 5.0 ~ 8.0HK, and the hardest 6H is 45.0 ~ 53.0HK. The main physical indicators of commonly used HB and 3B are: [0003] The Knoop hardness of HB is 18.0~23.0HK, the core force is ≥9.80N, and the concentration (absorbance) is ≥0.30; [0004] The Knoop hardness of 3B is 11.0~14.0HK, the force on the tip of the core is ≥9.31N, and the concentration (absorbance) is ≥0.40. [0005] In order to ensure that the user can still easily see the traces written by the pencil lead in special occasions with poo...

Claims

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Application Information

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IPC IPC(8): C09D13/00
Inventor 黄维虎马群余宝康竺佩娟罗浓青
Owner 中国第一铅笔泗洪有限公司
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