Method for producing raised structures on the surface of a pencil

1. A method for producing raised structures serving as grip nubs on a surface of a pencil, which comprises the steps of:

applying, with a nozzle, a drop of a plastic preparation on the surface of the pencil for producing a respective one of the raised structures, removing the nozzle from the drop of plastic applied onto the surface of the pencil for detaching the nozzle from the preparation without stringing, and radiating the drop for curing the drop, the plastic preparation containing a radiation-curable plastic mass and has a composition of

a plastic mass formed from:

oligomer and monomer

40% to 98%

wt.;

photoinitiator system

0.1% to 30%

wt.;

amorphous silicon dioxide

0.3% to 30%

wt.;

and/or micronized amide wax

colorant

0% to 60%

wt.;

filler

0% to 60%

wt.;

further additives

0% to 10%

wt.; and

irradiating the raised structures for curing.

2. The method according to claim 1 , which further comprises forming the plastic preparation to contain at least one acrylate oligomer.

3. The method according to claim 2 , which further comprises forming the plastic preparation to contain 70% to 80% wt. of the acrylate oligomer and 1% to 25% wt. of an acrylate monomer.

4. The method according to claim 2 , which further comprises forming the plastic preparation with the acrylate oligomer selected from the group consisting of aromatic and aliphatic epoxy acrylates, polyester-, polyurethane-, oligoether-, amine-modified oligoether and polyol acrylates.

5. The method according to claim 4 , which further comprises forming the plastic preparation to have 70% to 80% wt. of urethane acrylate oligomer, and 1% to 15% wt. of acrylate monomer.

6. The method according to claim 1 , which further comprises forming the plastic preparation with 1% to 8% wt. of the photoinitiator system.

7. The method according to claim 6 , which further comprises forming the plastic preparation with 0.5% to 5% wt. of a photoinitiator and 0.5% to 3% wt. of a coinitiator.

8. The method according to claim 1 , which further comprises forming the plastic preparation with at least one of 0.5% to 5% wt. of amorphous silicon dioxide and micronized amide wax.

9. The method according to claim 8 , which further comprises applying the radiation-curable plastic mass to the surface of the pencil, the radiation-curable plastic mass has a composition as follows:

urethane acrylate oligomer

70%-80%

wt.;

acrylate monomer

1%-15%

wt.;

at least one of amorphous silicon dioxide

0.5%-5%

wt.;

and micronized amide wax

photoinitiator

0.5%-5%

wt.;

coinitiator

0.5%-3%

wt.; and

other additives

0.1%-10%

wt..

10. The method according to claim 9 , which further comprises using a preparation which comprises at least one of 0.3% to 2% wt. of a flow agent and lubricant and 0.1% to 1% wt. of an antifoam.

11. The method according to claim 1 , which further comprises forming the plastic preparation to contain the filler selected from the group consisting of kaolin, talc, barium sulfate, titanium white, calcium carbonate and mica.

12. The method according to claim 1 , which further comprises forming the plastic preparation to contain the filler selected from the group consisting of aluminum silicate hollow balls, expanded hollow balls, PU-softfeeling beads, micronized plastics, and PE waxes.

13. The method according to claim 12 , which further comprises selecting the micronized plastics from the group consisting of polypropylene and PTFE.