outer part 41 to manufacture the capsules 1 according to fig1 a 2 a 3 a 4 a 5 7 a 8 a 9 a 10 a 13 a 13 b and 14 a the said insert 3 is procured fitted with either its seal 50 or the sealing insert 51 that may be fixed and carrying a spout 8 or an u201c anti fill u201d device 8 u2032 the said insert typically being obtained by injection moulding of thermoplastic material the said blank 4 u2032 is formed or procured and then the said outer part or shell 4 comprising the said expanded part 43 is formed by local deformation according to the invention the insert 3 is then assembled to the shell 4 typically by gluing however capsules 1 u2032 according to fig1 c and 17 d are manufactured by procuring the seal 50 or the sealing insert 51 possibly fixed and carrying a spout 8 or an u201c anti fill u201d device 8 u2032 as in the previous case the said blank 4 u2032 is formed or procured and then the said outer part or shell 4 comprising the said expanded part 43 is formed by local deformation according to the invention the seal 50 or the sealing insert 51 is then assembled to the shell 4 in step c of this method the said local radial expansion may be obtained by axial compression of an expandable punch 95 in the said blank 4 u2032.