Injection moulding process for producing a syringe with an integrated closure element comprising the following process steps: a) providing an injection moulding tool which comprises a first , a second and a third tool portion , wherein the first tool portion has a mould cavity open at both sides and extending along an axial direction (X), and wherein the second tool portion has a first injection moulding core and the third tool portion has a second injection moulding core ; b) closing the injection moulding tool such that the first tool portion contacts the second and third tool portion , and the first and second injection moulding core each enter the mould cavity of the first tool portion through an opening and finally contact each other, as a result of which these tool portions form a first cavity ; c) injecting a first plastic material into the first cavity , as a result of which a hollow cylindrical syringe body is formed with an end region at its distal end , wherein the end region has an attachment element , provided with an inner thread , and a hollow cylindrical end piece which is at least partially bordered by the attachment element ; d) cooling the tool portions , as a result of which the syringe body cools and hardens; e) bringing the first tool portion into contact with a fourth tool portion provided with a mould cavity closed at one end, as a result of which a second cavity is formed at the distal end of the syringe body ; f) injecting a second plastic material into the second cavity , as a result of which the closure element is integrally formed on the attachment element , wherein the first and the second plastic material do not enter into a cohesive connection. a) providing an injection moulding tool which comprises a first , a second and a third tool portion , wherein the first tool portion has a mould cavity open at both sides and extending along an axial direction (X), and wherein the second tool portion has a first injection moulding core and the third tool portion has a second injection moulding core ; b) closing the injection moulding tool such that the first tool portion contacts the second and third tool portion , and the first and second injection moulding core each enter the mould cavity of the first tool portion through an opening and finally contact each other, as a result of which these tool portions form a first cavity ; c) injecting a first plastic material into the first cavity , as a result of which a hollow cylindrical syringe body is formed with an end region at its distal end , wherein the end region has an attachment element , provided with an inner thread , and a hollow cylindrical end piece which is at least partially bordered by the attachment element ; d) cooling the tool portions , as a result of which the syringe body cools and hardens; e) bringing the first tool portion into contact with a fourth tool portion provided with a mould cavity closed at one end, as a result of which a second cavity is formed at the distal end of the syringe body ; f) injecting a second plastic material into the second cavity , as a result of which the closure element is integrally formed on the attachment element , wherein the first and the second plastic material do not enter into a cohesive connection. <EOS>