WinRich Stationery

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		WinRrich attend Paperwolrd 2014 on this largest wolrd stationery exhibition Winrich will show its all New 2014 products for buyers. Our booth is 4.1 Hall 19

		New 2014 products catalogue is online active now difficult to find new products idea? whyn't to view Winrich 2014 products catalogue

		Meet Winrich on Creativeworld 2014.. for all buyers , meet us on Frankfurt, 30 January - 2 February, 2014

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History of erasers

In 1770, the noted scientist Sir Joseph Priestley (discoverer of oxygen) recorded the following, "I have seen a substance excellently adapted to the purpose of wiping from paper the mark of black lead pencil." Europeans were rubbing out pencil marks with the small cubes of rubber, the substance that Condamine had brought to Europe from South America. They called their erasers "peaux de negres". However, rubber was not an easy substance to work with because it went bad very easily -- just like food, rubber would rot. English engineer, Edward Naime is also credited with the creation of the first eraser in 1770. Before rubber, breadcrumbs had been used to erase pencil marks. Naime claims he accidentally picked up a piece of rubber instead of his lump of bread and discovered the possibilities, he went on to sell the new rubbing out devices or rubbers.

In 1839, Charles Goodyear discovered a way to cure rubber and make it a lasting and useable material. He called his process vulcanization, after Vulcan, the Roman god of fire. In 1844, Goodyear patented his process. With the better rubber available, erasers became quite common.

Winrich Erasers

Winrich Eraser is made from 100% recycled PVC, not rubber. Because PVC has more safety for human health and nature environment.

Winrich Erasers' Making Process

Today's Winrich erasers are made from recycled PVC. The raw material is blended to the proper consistency and is put into a machine called an "extruder." The eraser material is forced through a small hole producing a long ribbon of eraser.

Each ribbon is cut into strands about 3 feet in length. Agone the eraser is made of synthetic rubber, the strands are placed in a "vulcanizer," which cooks them under pressure to cure the rubber. When cool, the strands are put into a rotary cutter and chopped into bits -- called plugs. Today PVC eraser strands go straight to the rotary cutter. PVC does not need to be vulcanized!

Likewise, Rubber eraser plugs must be tumbled to round-off the edges. The tumbler is a big drum that rotates slowly -- and it holds 600 pounds of rubber eraser plugs at a time! PVC eraser plugs do not need to be tumbled -- they're ready to insert right from the cutter.

See how to make eraser on the end of pencil

The eraser plugs are placed into a rotating hopper. As it turns, the hopper lines up the plugs one after another, and sends them down a conveyor line to the machine that will place them on the ends of pencils.

Small bands of metal, called "ferrules" are placed into another rotating hopper. This hopper lines up the ferrules and sends them, one by one, down another conveyor line to the machine that will place them on the ends of pencils.

The ferrules and eraser plugs move along their conveyors to an insertion machine. The inserter is made up of a series of plungers that move in and out. Painted pencils are carried along another conveyor line past the inserter. First, the machine cuts a small recess around the end of the pencil.

Next, a plunger presses a glue-filled ferrule onto the end of each pencil. Then another plunger presses an eraser plug into each ferrule.The pencils move down the line to still another set of plungers that push the erasers firmly into place. When the glue dries, the pencil is complete!

Factoid of eraser

A lot of erasers are made by pencils manufacturers! That makes sense, since we think of the eraser as a regular component of the everyday pencil. But pencils didn't always have erasers. The first patent for attaching an eraser to a pencil was issued in 1858 to a man from Philadelphia named Hyman Lipman. And even today in Europe, most pencils are sold without erasers!

Erasers weren't always called erasers! The item was originally referred to as a "rubber," because the tree resin it was made of "rubbed out" marks made by a pencil. In Great Britain, the eraser is still called a "rubber!"

To eraser manufacturers, those little erasers on the ends of pencils aren't called "erasers" at all. We call them "plugs!"

More and more of today's erasers are made from something other than rubber! While some of the "pink" erasers you find on pencils are made from synthetic rubber blended with pumice (a grit that enhances its ability to erase), an increasing number of erasers are made from PVC. This PVC is a type of durable, flexible plastic.

The pencil plant shown in these photographs makes two tons of eraser plugs for Incense-cedar pencils every day! They also make erasers for mechanical pencils, erasers for pens, and erasers you can use by hand.

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