Abstract: The invention relates to a stopper capsule, having an axial direction, comprising a shell, with a head, a skirt, and a joint, where a) said joint is a form joint, b) the form joint has b1) a resilient layer, a set of adjacent layers, b2.1) a barrier layer, b2.2) a malleable support layer with the function of providing the said set of adjacent layers a global malleable property such that the joint can be shaped without creation of folds, b2.3) an outer layer having an outer surface which can be compressed by the axial compression resulting from stoppering such as to match the form of the mouth of the neck. The invention further relates to a method of production of the capsule and a method of stoppering.

Abstract: An extension flow mixer especially for viscous liquids has a housing (10) with an end inlet (12a, 14a) connectable to a pressurized source of the liquid, and an outlet (119) at an opposite end of the housing (10). A mandrel (30) located in the cavity has protrusions (20′, 32′) with sloping side surface, the outer edges of which cooperate with the internal surface (114a) of the cavity to divide the cavity into a series of chambers separated by slits, such that liquid passes successively through all the chambers and slits in moving from the inlet (12a, 14a) to the outlet (119). The slits have cross-sectional areas which decrease in the liquid flow direction. The mandrel (30) sides have helical grooves (134) forming passageways with the housing wall (114a) which allow liquid to be distributed evenly around the edges of the mandrel (30) to the inlet end or upstream chamber. The mandrel (30) may rotate to provide additional shear mixing.