AT89597B - Process for encasing graphite leads. - Google Patents
Process for encasing graphite leads.Info
- Publication number
- AT89597B AT89597B AT89597DA AT89597B AT 89597 B AT89597 B AT 89597B AT 89597D A AT89597D A AT 89597DA AT 89597 B AT89597 B AT 89597B
- Authority
- AT
- Austria
- Prior art keywords
- sep
- encasing
- graphite leads
- drying
- coating
- Prior art date
Links
Landscapes
- Drying Of Solid Materials (AREA)
- Processing Of Solid Wastes (AREA)
- Laminated Bodies (AREA)
Description
<Desc/Clms Page number 1>
EMI1.1
EMI1.2
durch Anpressen aufgetragen wird.
Die bisher bekannten Verfahren zum Überziehen solcher Mincn mit teigigen Massen haben den Nachteil. da# das Erzeugnis. dessen Mine im Verh#ltnis zur Überzugsschicht dünn und wenig widerstandsfähig ist. unter Einwirkung der beim Trocknen auftretenden inneren Spannungen Formverände-
EMI1.3
Schicht, hierauf eine oder mehrere, im Vergleich mit der vorangehenden dickere und langsamer trocknende. nach dem Trocknen grössere Härte besitzende Schichten aufgetragen werden.
Während die Gefahr eines Verziehens beim Trocknen der ersten Schicht durch ihre geringe Stärke sehr verringert ist. begegnet das Trocknen während der späteren Behandlung bereits dem grösseren Widerstand der in die erste Schicht eingebetteten Mine und die Formveränderung beim Trocknen der dickeren äu#eren Schichten wird sehrgering
Die verhältnismässige Weichheit der inneren und die Härte der äusseren Schichten vereint den Vorteil bestmöglichsten Schutzes der Mine gegen Sto# und Druck mit den günstigsten Bedingungen beim Schneiden der Überzugsmasse (Anspitzen). indem der Widerstand beim Schneiden vom Umfang gegen den Kern stetig abnimmt.
EMI1.4
aber auch Papier oder Lumpen), bis zu 6 # inertem Material (insbesondere Magnesiumsilikat, doch auch Ton, Kalk, Gips) und bis zu 18""z zusammenballendem Material (insbesondere Casein, jedoch auch kieselsaures Kali oder Soda. Kleister, Harze. Gummi) erwiesen.
Erfolgt die Auftragung der Überzugsmassen in zwei Schichten, dann wird die erste, deren Dicke zweckmässigerweise ein Viertel der Gesamtdicke des Überzuges beträgt und deren Trocknen so rasch als möglich herbeigeführt wird am besten nach folgender Zusammensetzung gebilder:
EMI1.5
<tb>
<tb> Sägespäne <SEP> 31 #
<tb> Casein <SEP> 13 #
<tb> Magnesiumsilikat <SEP> 3 #
<tb> Wasser <SEP> ##
<tb> 100%
<tb>
<Desc/Clms Page number 2>
EMI2.1
EMI2.2
<tb>
<tb> Sägespäne <SEP> 32",,
<tb> Casein <SEP> is, <SEP> "
<tb> Magnesiumsilikat <SEP> 3 #
<tb> Wasser <SEP> 47"
<tb>
EMI2.3
<Desc / Clms Page number 1>
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is applied by pressing.
The previously known methods of coating such minerals with pasty masses have the disadvantage. da # the product. whose lead is thin and not very resistant in relation to the coating layer. changes in shape under the influence of internal stresses occurring during drying
EMI1.3
Layer, then one or more, thicker and slower drying in comparison with the previous one. After drying, layers with greater hardness can be applied.
While the risk of warping when the first layer dries is very reduced due to its low thickness. If drying during the later treatment already encounters the greater resistance of the lead embedded in the first layer and the change in shape during drying of the thicker outer layers is very slight
The relative softness of the inner and the hardness of the outer layers combine the advantage of the best possible protection of the lead against impact and pressure with the most favorable conditions when cutting the coating material (sharpening). in that the resistance decreases steadily when cutting from the circumference against the core.
EMI1.4
but also paper or rags), up to 6 # inert material (especially magnesium silicate, but also clay, lime, gypsum) and up to 18 "" z agglutinating material (especially casein, but also siliceous potash or soda, paste, resins, rubber ) proved.
If the coating material is applied in two layers, then the first, the thickness of which is best a quarter of the total thickness of the coating and the drying of which is brought about as quickly as possible, is best formed according to the following composition:
EMI1.5
<tb>
<tb> sawdust <SEP> 31 #
<tb> Casein <SEP> 13 #
<tb> magnesium silicate <SEP> 3 #
<tb> water <SEP> ##
<tb> 100%
<tb>
<Desc / Clms Page number 2>
EMI2.1
EMI2.2
<tb>
<tb> sawdust <SEP> 32 ",,
<tb> Casein <SEP> is, <SEP> "
<tb> magnesium silicate <SEP> 3 #
<tb> water <SEP> 47 "
<tb>
EMI2.3
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR89597X | 1919-03-25 |
Publications (1)
Publication Number | Publication Date |
---|---|
AT89597B true AT89597B (en) | 1922-10-10 |
Family
ID=8777884
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
AT89597D AT89597B (en) | 1919-03-25 | 1920-07-09 | Process for encasing graphite leads. |
Country Status (1)
Country | Link |
---|---|
AT (1) | AT89597B (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2937441A1 (en) * | 1979-09-15 | 1982-04-01 | Schwan-Stabilo Schwanhäußer GmbH & Co, 8500 Nürnberg | Cosmetic pencil esp. with non castable core - has surrounding shell esp. of polyolefin cast around core |
DE102005004176A1 (en) * | 2005-01-26 | 2006-07-27 | J. S. Staedtler Gmbh & Co. Kg | Refill for writing, drawing or painting instruments has at least one coating or partial coating containing pieces of data specific to refill |
DE102005004175A1 (en) * | 2005-01-26 | 2006-07-27 | J. S. Staedtler Gmbh & Co. Kg | Refill for writing, drawing and painting instruments has sleeve with higher bending and breaking strength than refill core |
-
1920
- 1920-07-09 AT AT89597D patent/AT89597B/en active
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2937441A1 (en) * | 1979-09-15 | 1982-04-01 | Schwan-Stabilo Schwanhäußer GmbH & Co, 8500 Nürnberg | Cosmetic pencil esp. with non castable core - has surrounding shell esp. of polyolefin cast around core |
DE102005004176A1 (en) * | 2005-01-26 | 2006-07-27 | J. S. Staedtler Gmbh & Co. Kg | Refill for writing, drawing or painting instruments has at least one coating or partial coating containing pieces of data specific to refill |
DE102005004175A1 (en) * | 2005-01-26 | 2006-07-27 | J. S. Staedtler Gmbh & Co. Kg | Refill for writing, drawing and painting instruments has sleeve with higher bending and breaking strength than refill core |
DE102005004175B4 (en) * | 2005-01-26 | 2013-11-28 | J. S. Staedtler Gmbh & Co. Kg | Mine for writing, drawing or painting equipment |
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