Product information STAEDTLER MARS GmbH & Co.
Product information Erasers - Sharpeners Contents 1 Erasers _____________________________________________________ 3 1.1 1.2 1.3 1.4 1.5 1.6 1.6.1 1.6.1.1 1.6.1.2 1.7 Requirements .............................................................................................................3 History.........................................................................................................................3 What is rubber? ........................................................................
Product information Erasers - Sharpeners 1 Erasers Not every eraser has the same erasing performance to offer. There are different erasers available especially designed to meet the requirements of different writing instruments (blacklead pencils, coloured pencils, fountain pens and technical pens). The performance of an eraser is dependent on whether the mark to be erased is only on the surface or whether it has already penetrated deeper into, e.g., the paper.
Product information Erasers - Sharpeners 1.3 What is rubber? Natural rubber’s raw material, so-called latex milk, is extracted from a certain tree, known by Indians as the “caa-o-chu weeping tree”. The polyisoprene extracted from the tree sap is known as natural rubber. Nowadays, grooves are still cut into the trunks of these rubber-giving trees and the drops of sap are collected in receptacles. Illustration 1: Latex milk extraction The process of vulcanisation, i.e.
Product information Erasers - Sharpeners 1.5 Synthetic rubber eraser tips STAEDTLER eraser tips are made out of thermoplastic elastomeres (TPE), i.e. synthetic rubber. A key advantage of TPE is that it can be processed using heat only, no other treatment is necessary. It is ready for use immediately after cooling.
Product information Erasers - Sharpeners 1.6 Polymer eraser blocks Erasers made out of polymer, such as polyvinyl chloride, first appeared in the mid fifties. They began to be produced at STAEDTLER in 1960. In 1967, STAEDTLER became the first company to manufacture these erasers using the socalled extrusion process. The main advantage of this method is that it is a continuous, energysaving manufacturing process.
Product information Erasers - Sharpeners 1.6.1.
Product information Erasers - Sharpeners 1.6.1.2 Application tips Correcting mistakes on overhead film Minor corrections to overhead pen marks on overhead film can be made using Mars plastic or rasoplast erasers. Tips Household use Cleaning wallpaper. The Mars plastic eraser is particularly handy for removing light marks from wallpaper, e.g. around light switches. The eraser is also ideal for cleaning the plastic parts of light switches. Streaks on PVC floors caused by dark shoe soles.
Product information Erasers - Sharpeners 2 Sharpeners In 1821 there were already a variety appliances used for sharpening pencils. Points were sharpened using one or more files. Towards the end of the 18th century, similar kinds of sharpeners to the ones we know today began to appear on the market. 2.1 Metal sharpeners and tub sharpeners Material We offer metal sharpeners made out of a magnesium-aluminium alloy and polystyrene plastic sharpeners with metal blades.
Product information Erasers - Sharpeners 2.1.1 The right choice 2.1.1.1 Sharpener for writing pencils This sharpener is suitable for use with all standard-sized pencils. The pointed cone (see ill. 11, red pencil) gives a sharp writing point for drawing fine lines and is particularly suitable for blacklead pencils. Illustration 9: Sharpener for standard-sized pencils 2.1.1.
Product information Erasers - Sharpeners 2.1.1.3 Special sharpener for coloured pencils The double-hole tub sharpener 512 233 is suitable for standard and jumbo-sized pencils and for triangular pencils up to ∅ 11 mm. Both holes give a blunt point. See illustration 13. Illustration 12: Special sharpener for coloured pencils and cosmetic pencils Ideal for coloured pencils, cosmetic pencils and eraser pencils The blunt cone provides a sturdy colouring point.
Product information Erasers - Sharpeners 2.2 Rotary sharpener Nowadays, rotary sharpeners operate according to the milling principle. This involves a multiple milling cutter being rotated around the pencil at a fixed angle. The length of the point can be set as required. Once the set length has been reached, the machine runs free so that the pencil does not get shortened unnecessarily.
Product information Erasers - Sharpeners 2.3 Lead pointer for leadholders Leadholders require different points due to the variety of applications they are used for: a blunt point for normal writing and a very sharp point for drawing. Illustration 18: Writing and drawing points for leadholders The triangular symbols next to the small holes indicate the different kinds of points.
