Pump cylinder and method of producing a thermoplastic alloy for one such pump cylinder
The invention relates to a fluid product dispensing pump cylinder which is intended to be assembled to a fluid product tank. According to the invention, the pump cylinder is made from a thermoplastic alloy comprising a mixture of homopolymer polypropylene and high-density polyethylene.
1. A fluid dispenser pump body for assembling on a fluid reservoir, the pump body being characterized in that it is made of a thermoplastic alloy, said alloy comprising a mixture of polypropylene homopolymer and of high-density polyethylene.
2. A pump body according to claim 1 , comprising a mixture of about 85% polypropylene homopolymer and about 15% high-density polyethylene.
3. A pump body according to claim 1 , in which said alloy presents resistance to impacts greater than 3 kJ/m 2 , advantageously of the order of 5 kJ/m 2 to 6 kJ/m 2 .
4. A pump body according to claim 1 , in which said alloy presents mean resistance to pressure greater than 25 bars, and preferably about 40 bars.
5. A pump body according to claim 1 , in which, over a plurality of identical components, the standard deviation in the mean resistance to pressure of the alloy is less than 1.5 bars, preferably less than 1 bar.
6. A method of fabricating a thermoplastic alloy according to claim 1 , including the step of mechanically polyblending polypropylene homopolymer and high-density polyethylene.
7. The pump according to claim 1 , wherein the thermoplastic alloy is made by mechanically polyblending polypropylene homopolymer and high-density polyethylene.
8. The pump body according to claim 1 , comprising a mixture of about 70% to 85% polypropylene homopolymer and about 15% to 30% high-density polyethylene.
9. The pump body according to claim 1 , comprising a mixture of about 85% to 90% polypropylene homopolymer and about 10% to 15% high-density polyethylene.
10. A pump body according to claim 1 , comprising a mixture of about 70% to 90% polypropylene homopolymer and about 10% to 30% high-density polyethylene.
11. The pump body according to claim 10 , wherein the thermoplastic alloy is made by mechanically polyblending polypropylene homopolymer and high-density polyethylene.
12. The pump body according to claim 1 , wherein the pump body is made by injection-molding using the thermoplastic alloy, said alloy comprising a mixture of polypropylene homopolymer and of high-density polyethylene.
13. The pump body according to claim 12 , wherein the thermoplastic alloy comprises a mixture of about 70% to 90% polypropylene homopolymer and about 10% to 30% high-density polyethylene.
14. The pump according to claim 12 , wherein the thermoplastic alloy is made by mechanically polyblending polypropylene homopolymer and high-density polyethylene.
15. The pump body according to claim 12 , wherein the thermoplastic alloy comprises a mixture of about 70% to 85% polypropylene homopolymer and about 15% to 30% high-density polyethylene.
16. The pump body according to claim 12 , wherein the thermoplastic alloy comprises a mixture of about 85% to 90% polypropylene homopolymer and about 10% to 15% high-density polyethylene.
17. A process of manufacturing a fluid dispenser pump body for assembling on a fluid reservoir, comprising:
providing quantities of polypropylene homopolymer and of high-density polyethylene,
mechanically polyblending the quantities of polypropylene homopolymer and the high-density polyethylene to produce a thermoplastic alloy, and
injection-molding the thermoplastic alloy to form the pump.
18. The process according to claim 17 , wherein the thermoplastic alloy comprises a mixture of about 70% to 90% polypropylene homopolymer and about 10% to 30% high-density polyethylene.
19. The process according to claim 17 , wherein the thermoplastic alloy comprises a mixture of about 70% to 85% polypropylene homopolymer and about 15% to 30% high-density polyethylene.
20. The process according to claim 17 , wherein the thermoplastic alloy comprises a mixture of about 85% to 90% polypropylene homopolymer and about 10% to 15% high-density polyethylene.