Dispenser part

Abstract

A dispenser part includes a first injection molded plastic component part with an associated first mating surface along a first edge; a second injection molded plastic component part having an associated second mating surface; a seam formed by the first mating surface and the second mating surface during injection moulding for joining the first component part and the second component part to define a dispenser part. A transverse cross section of the seam includes at least one step and at least one contact surface intermediate an inner and an outer surface of the dispenser part.

1 . Dispenser part, comprising at least two component parts each joined by a seam, said dispenser part comprising a first injection moulded plastic component part with an associated first mating surface along a first edge; a second injection moulded plastic component part having an associated second mating surface; a seam formed by said first mating surface and said second mating surface during injection moulding for joining said first component part and said second component part to define a dispenser part, characterized in that a transverse cross section of the seam comprises at least one step and at least one contact surface intermediate an inner and an outer surface of the dispenser part. 
     
     
         2 . Dispenser part according to  claim 1 , wherein each contact surface extends along the length of the seam. 
     
     
         3 . Dispenser part according to  claim 1 , wherein the contact surface has a transverse extension of up to 5 times the thickness of at least one component part adjacent the seam. 
     
     
         4 . Dispenser part according to  claim 3 , wherein the contact surface has a transverse extension between 3 to 5 times the thickness of at least one component part adjacent the seam. 
     
     
         5 . Dispenser part according to  claim 1 , wherein the transverse cross section of the seam comprises a first step adjacent the outer surface of the dispenser part. 
     
     
         6 . Dispenser part according to  claim 5 , wherein the first step comprises a first contact surface at right angles to the outer surface of the dispenser part and an adjoining second contact surface extending towards the first edge. 
     
     
         7 . Dispenser part according to  claim 5 , wherein the transverse cross section of the seam comprises a second step adjacent the inner surface of the dispenser part. 
     
     
         8 . Dispenser part according to  claim 7 , wherein the second step comprises a third contact surface at right angles to the inner surface of the dispenser part, said third contact surface coinciding with the first edge. 
     
     
         9 . Dispenser part according to  claim 7 , wherein the first and the second steps have a height equal to or less than half the thickness of at least one component part adjacent the seam, which steps are joined by the second contact surface. 
     
     
         10 . Dispenser part according to  claim 7 , wherein the first and the second steps have a height between ⅙ and 14 the thickness of at least one component part adjacent the seam. 
     
     
         11 . Dispenser part according to  claim 6 , wherein the second contact surface comprises raised contact increasing means along the length of the seam. 
     
     
         12 . Dispenser part according to  claim 11 , wherein the raised contact increasing means are arranged to be melted during injection moulding of the second component part. 
     
     
         13 . Dispenser part according to  claim 11 , wherein the raised contact increasing means comprises at least one additional step. 
     
     
         14 . Dispenser part according to  claim 13 , wherein each additional step has a height of 0.05 to 1 mm. 
     
     
         15 . Dispenser part according to  claim 13 , wherein the raised contact increasing means comprises steps having an equal height. 
     
     
         16 . Dispenser part according to  claim 13 , wherein, in a transverse cross-section, the at least one additional step has a height that is equal to or less than the height of the first step. 
     
     
         17 . Dispenser part according to  claim 13 , wherein the additional steps have a height between 1/20 and ⅓ of the thickness of at least one component part adjacent the seam. 
     
     
         18 . Dispenser part according to  claim 13 , wherein, in the transverse direction, each adjacent step is separated by a distance equal to or greater than the height of the smaller of said steps. 
     
     
         19 . Dispenser part according to  claim 11 , wherein the raised contact increasing means comprises at least one projection along the length of the seam. 
     
     
         20 - 31 . (canceled)