Spray package and process for producing the same

Claim 2

Packaging (1) having a longitudinal axis, comprising an internal wall (17) and an external wall, and a piston (8) sliding within and in contact with the internal wall, a portion of said internal wall that is adapted to come into contact with the piston having grooves (18) with a depth no greater than 100 μm that are perpendicular to said longitudinal axis to ensure sealing between the piston and said internal wall.

Claim 3

Packaging according to claim 1, wherein the grooves (18) are annula.

Claim 4

Packaging according to claim 1, wherein the grooves are spaced apart from each other at an interval no more than 1,000 μm.

Claim 5

Packaging according to claim 1, wherein the piston (8) is provided with a sealing joint (9) which is continuous in a plane parallel to the grooves (18).

Claim 6

Packaging according to claim 1, wherein said internal wall (17) is substantially cylindrical.

Claim 7

Packaging according to claim 4, wherein the joint (9) is toric.

Claim 8

Packaging according to claim 1, which contains a liquid (5) and a gas (7) for propelling the liquid.

Claim 9

Packaging according to claim 7, in which the liquid (5) and the gas (7) are disposed on opposite sides of the piston.

Claim 10

Packaging according to claim 8 further comprising a dispensing valve (10), the liquid being located between the dispensing valve (10) and the piston (8).

Claim 11

Process for producing packaging having a longitudinal axis and comprising an internal wall (17) and an external wall and a piston (8) sliding in the packaging in contact with the internal wall (17), the process comprising brushing the internal wall (17) of the packaging in a direction perpendicular to said longitudinal axis thereby to impart to said internal wall grooves (18) perpendicular to the longitudinal axis so as to ensure sealing between said internal wall (17) and a said piston (8) and thereafter inserting said piston (8) into the packaging in contact with said internal side wall (17).

Claim 12

Process for producing packaging having a longitudinal axis and comprising an internal wall (17) and an external wall and a piston (8) sliding in the packaging in contact with the internal wall (17), the process comprising brushing the internal wall (17) of the packaging in a direction perpendicular to said longitudinal axis thereby to impart to said internal wall grooves (18) perpendicular to the longitudinal axis so as to ensure sealing between said internal wall (17) and a said piston (8) and thereafter inserting said piston (8) into the packaging in contact with said internal side wall (17).

Claim 13

A packaging (1) having a longitudinal axis, comprising a cylindrical internal wall (17) and an external wall, and a piston (8) sliding in the packaging and having an annular sealing joint (9) which is in sealing contact with said internal wall; the improvement comprising annular grooves (18) perpendicular to said longitudinal axis and disposed in said internal wall to insure sealing between said sealing joint and said internal wall, said grooves being spaced apart from each other by no more than 1,000 μm and having a depth no greater than 100 μm.

Claim 14

A packaging (1) having a longitudinal axis, comprising a cylindrical internal wall (17) and an external wall, and a piston (8) sliding in the packaging and having an annular sealing joint (9) which is in sealing contact with said internal wall; the improvement comprising annular grooves (18) perpendicular to said longitudinal axis and disposed in said internal wall to insure sealing between said sealing joint and said internal wall, said grooves being spaced apart from each other by no more than 1,000 μm and having a depth no greater than 100 μm.

Claim 15

Packaging according to claim 11, which contains a liquid (5) and a gas (7) for propelling the liquid.

Claim 16

Packaging according to claim 12, in which the liquid (5) and the gas (7) are disposed on opposite sides of the piston.

Claim 17

Packaging according to claim 13, further comprising a dispensing valve (10) for the liquid, the liquid being located between the dispensing valve (10) and the piston (8).

Claim 18

A process for producing packaging having a longitudinal axis and comprising a cylindrical inner wall (17) and an external wall and a piston (8) having an annular sealing joint (9) sliding in the packaging in contact with said internal wall (17), the process comprising brushing the internal wall (17) of the packaging in a direction perpendicular to said longitudinal axis thereby to form in said internal wall (17) annular grooves (18) perpendicular to said longitudinal axis so as to insure sealing between said internal wall (17) and said sealing joint (9), said grooves being spaced apart from each other no more than 1,000 μm and having a depth no greater than 100 Am, and thereafter inserting said piston (8) into the packaging with said toric sealing joint (9) in contact with said internal side wall (17).

Claim 19

A process for producing packaging having a longitudinal axis and comprising a cylindrical inner wall (17) and an external wall and a piston (8) having an annular sealing joint (9) sliding in the packaging in contact with said internal wall (17), the process comprising brushing the internal wall (17) of the packaging in a direction perpendicular to said longitudinal axis thereby to form in said internal wall (17) annular grooves (18) perpendicular to said longitudinal axis so as to insure sealing between said internal wall (17) and said sealing joint (9), said grooves being spaced apart from each other no more than 1,000 μm and having a depth no greater than 100 Am, and thereafter inserting said piston (8) into the packaging with said toric sealing joint (9) in contact with said internal side wall (17).