Preform for plastics material bottles or wide-necked vessels

Abstract

A preform for manufacturing plastics material bottles or wide-necked vessels is described, having a rigid, substantially elongate, frustoconical body portion that is closed at one of its longitudinal ends by a dome-shaped end portion and at its opposite longitudinal end adjoins via a preform collar a neck portion provided with a pouring opening. The preform possesses in the body portion an external diameter that is reduced from the preform collar to the end portion. The body portion has a wall thickness which changes over its longitudinal extension substantially constantly by up to +2 mm. For this purpose, it possesses an internal diameter which decreases substantially constantly from a transition to the preform collar up to a transition to the dome-shaped end portion.

1 . A preform for manufacturing plastics material bottles or wide-necked vessels, comprising:
 a rigid, substantially elongate, frustoconical body portion that is closed at one of its longitudinal ends by a dome-shaped end portion and at its opposite longitudinal end adjoins, via a preform collar, a neck portion provided with a pouring opening and has an external diameter which is reduced from the preform collar to the end portion;   the body portion having a wall thickness that changes over its longitudinal extension substantially constantly by up to ±2 mm, and has an internal diameter that decreases substantially constantly from a transition to the preform collar up to a transition to the dome-shaped end portion.   
     
     
         2 . The preform according to  claim 1 , wherein the preform collar has an external diameter that changes from the neck portion to the body portion, while its internal diameter decreases substantially constantly from the neck portion to the body portion. 
     
     
         3 . The preform according to  claim 2 , wherein the external diameter of the preform collar increases in size from the neck portion to the body portion at least in a portion thereof. 
     
     
         4 . The preform according to  claim 2 , wherein the external diameter of the preform collar decreases in size from the neck portion to the body portion at least in a portion thereof. 
     
     
         5 . The preform according to  claim 1 , wherein an inner wall and an outer wall of the preform collar join with an adjoining inner wall or outer wall of the body portion at obtuse angles that are from about 130° to less than 180°. 
     
     
         6 . The preform according to  claim 1 , wherein the body portion has a minimum wall thickness greater than 0.8 mm. 
     
     
         7 . The preform according to  claim 1 , wherein the body portion does not exceed a maximum wall thickness of 6 mm. 
     
     
         8 . The preform according to  claim 1 , wherein the internal diameter of the body portion is reduced from the preform collar to the dome-shaped end portion by 0.1 mm-3.5 mm. 
     
     
         9 . The preform according to  claim 1 , wherein the body portion has an external diameter which is reduced from the preform collar to the dome-shaped end portion by 0.1-3.5 mm. 
     
     
         10 . The preform according to  claim 1 , wherein the dome-shaped end portion has a wall thickness that is reduced from the wall thickness of the body portion up to an injection point by 0% to 50%, and wherein the wall thickness is not taken into account in the injection point. 
     
     
         11 . The preform according to  claim 1 , wherein at least 85% of the body portion of the preform is made of materials selected from the group comprising, polyesters, including PET, PBT, PLA, and PEN, copolyesters, polyolefins, PP, HDPE, and polystyrenes, including GPS or HIPS. 
     
     
         12 . The preform according to  claim 1 , wherein the perform is manufactured by injection moulding, extrusion or spray foaming. 
     
     
         13 . The preform according to  claim 1  wherein the preform collar is separated from the neck portion by a transport ring. 
     
     
         14 . The preform according  claim 1 , wherein the wall thickness of the preform collar increases constantly over at least a partial region. 
     
     
         15 . The perform of  claim 1 , wherein the perform forms a plastics material bottle by an injection blow moulding or injection stretch blow moulding process.