How Erasers Are Made

They start by putting rubber into a mill. The rubber passes between the heated rollers. Then they add sulfur to the rubber as a curing agent. They add accelerators to help the sulfur, and red coloring. They blend every five to ten minutes until the mixture is done. Then they add vegetable oil treated with sulfur, regular vegetable oil, and calcium carbonate as a filler. When it is done, workers remove the rubber. They leave it to cool and harden at room temperature for about half a day. When the rubber is ready, they cut it into large squares. The squares go into a heated press to cure for about 20 minutes at 163°C. When it’s done, workers trim off the excess and put it in cold water. Then they take the rubber out and cut the rubber into strips. One blue and one red. They line up the blue and red together and they put it in the heated press for 12 minutes. Then they remove the trays and trim off the excess. Then they put it in cold water. Then they take the erasers out and put them on a machine that cuts strips with beveled edges. Then cuts strips into erasers. Then they drop it into a giant barrel. Workers throw in some talc so they won’t stick together. They set the barrel spinning for 3 to 5 hours. Then they stamp the erasers and package them. 

1. Worker put rubber into a mill
2. They add sulfur, accelerators, and red coloring to the mill.
3. They blend everything for 5 to 10 minutes until everything is done.
4. They take the rubber out and leave it to to cool and harden at room temperature about half a day.
5. When it’s done, they cut the rubber into big squares.
6. The squares go into a heated press to cure for about 20 minutes at 163℃
7. When it’s done workers take out the trays and trim the squares.
8. Workers put the squares in cold water.
9. They take out the rubber and cut the rubber into strips. One blue and One red.
10. Workers line up the blue and red and put it in the steam press
11. They take the rubber out and put it in cold water.
12. Then they take the rubber out and put the erasers on a machine that cuts strips with beveled edges.
13. The erasers fall into a giant barrel.
14. Workers throw in some talc in the barrel so it won’t stick.
15. They set the barrel spinning for 3 to 5 hours.
16. They stamp and package.