The following manufacturers of graphite and coloured - ewima-isz

The following manufacturers of graphite and coloured - ewima-isz
Creative design with
woodcased pencils
Which pencil sharpener for which pencil?
I
N D U S T R I E V E R B A N D
SCHREIBEN, ZEICHNEN, KREATIVES GESTALTEN E.V.
The following manufacturers of graphite and coloured
pencils are members of the ISZ e.V.
www.comet-denecke.de
www.eberhardfaber.de
www.faber-castell.com
www.lyra.de
www.stabilo.com
www.staedtler.de
The following manufacturers of pencil sharpeners are
members of the ISZ e.V.
www.eisen-sharpeners.com
www.moebius-ruppert.com
To get the addresses of these companies and to see their product range please
contact:
www.ewima-isz.de D Mitglieder
or contact the ISZ office.
The quality of the pencil sharpener, in particular the
quality of the blade, is of decisive importance for an
excellent sharpening result of woodcased pencils.
There are enormous differences in the
quality of pencil sharpeners.
Different pencils require different sharpeners.
This is the only way to avoid lead breakage and fraying
of the wood case at the pencil point.
The most frequent complaints with regard to
woodcased pencils do not concern the pencil itself but
the sharpening result after having used a sharpener
not suitable for this kind of pencil.
1
Basic design of a pencil sharpener
sharpening
hole
opening for
shavings
sharpening
angle
The sharpening angle of sharpeners marked with „graphite“ is optimized for
graphite pencils. The sharpening angle of sharpeners designated with “colour” is
optimized for coloured pencils.
Sharpening angle „Graphite“
Sharpening angle „Colour“ and „Jumbo“
Sharpeners for graphite and coloured pencils are important accessories for
woodcased pencils. They are – in contrast to coloured pencils for drawing – no
toy and thus do not have a CE-symbol (see ISZ-info “CE-symbol”).
2
How to recognize quality sharpeners?
Solid housing
The body of the sharpener is mostly made of plastic or metal, e.g. magnesium,
seldom wood. In general metal sharpeners guarantee a better fixation of the
blades and, as a whole, are more robust. Plastic sharpeners need to have
reinforcing ribs at the housing.
Sharp blade
In principle high quality sharpeners are equipped with specially hardened and
ground blades which are tightly screwed to the housing. The sharp blade should
fit tightly within the housing and should not be damaged.
3
Which sharpener for which pencil?
Graphite pencils and coloured pencils have different requirements with respect
to sharpening.
In general graphite pencils need a long sharp point, whereas coloured pencils
require a shorter and broader point.
Therefore we have to differentiate between sharpeners for coloured and
graphite pencils to achieve an excellent sharpening result. These sharpeners
are “tailor-made” for the corresponding pencils (graphite pencils, coloured
pencils, jumbo pencils). The important criteria are diameter of sharpening hole,
guiding length, sharpening angle and thickness of shavings.
Sharpener characteristics for the most important pencils.:
Diameter of
sharpening hole
Sharpening
angle **
Openings for
shavings
*
**
Sharpeners for ...
... graphite
... coloured
... Jumbo pencils
pencils
pencils
[graphite and coloured]
*
8.2 + 0.1 mm
8.2 to 8.5 mm
10.2 to 11.2 mm *
22° ± 1°
30° ± 2°
30° ± 2°
Has to be sufficiently dimensioned
(for shavings and the like).
The most frequent diameters of sharpening holes vary from manufacturer to
manufacturer depending on their pencil assortment.
Important for coloured pencils is a broad sharpening angle.
Sharpeners are suitable for round, triangular and hexagonal pencils.
The diameter is specified via the so-called ”circumcircle” (see picture):
circumcircle
Picture:
Circumcircle of pencils with
triangular and hexagonal
cross-section.
Please use “tailor-made” sharpeners for extremely thin or thick pencils as well
as for cosmetic pencils and other special pencils.
For special pencils (pastel pencils) only sharp blades (cutter blades) or emery
boards should be used. With common sharpeners one cannot achieve a
satisfying sharpening result! They wear and/or become blunt far too quickly.
4
How to sharpen correctly?
Right
Wrong
Guide pencil correctly within sharpener
(hold pencil straight)
Tilting, shaking,
pushing, “stirring”
Remove lead residue with soft object,
e.g. toothpick, other woodcased pencil
Paper clip, compass needle,
knife, ballpoint pen
Water colour pencils have to be dry
during sharpening
Wet sharpening
(lead will break)
Keep sharpeners in dry place
Humid storage conditions
(danger of corrosion)
Empty tub of the sharpener in time
Tub emptied too late.
Tub gets blocked
5
How long will a sharpener serve?
The blade will become blunt after a certain time. This leads to a higher number
of broken leads. In principle blades should be replaced after approx. 12 graphite
pencils or 24 coloured pencils have been completely sharpened!
6
Bottom line ...
Housing should be solid.
Knives should be sharp and correctly fixed.
Use sharpener intended for graphite and coloured pencils.
Choose suitable diameters and
hold pencils at correct sharpening angle.
Hold pencil straight in sharpener.
Store sharpeners always in dry places.
Humidity corrodes the high-quality blades!
Protect sharpener from damages caused by hard objects,
e.g. compasses and dirt (soft pencil bags).
Distance between sharpening blade and wall of sharpening
tub has to be sufficiently dimensioned. Empty sharpening
tub in time!
INDUSTRIEVERBAND SCHREIBEN, ZEICHNEN, KREATIVES GESTALTEN E.V.
Spittlertorgraben 39, D-90429 Nürnberg,
Phone: 0911/27229-0, Fax: 0911/27229-11, e-mail: info@ewima-isz.de, website: www.ewima-isz.de
All rights reserved. No part of this publication may be reprinted, photocopied and translated without
prior permission ot the publisher.
As at 01/2006
3rd updated edition
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