Plastic cap and a process for the production of the same

A cap arrangement for use in covering a mouth part of a container for a medicament, said cap arrangement comprising:

• a sealing material for sealing against the mouth part of the container;
• a hard plastic cap for covering the mouth part of the container and air-tightly fixing the sealing material to the container;
• wherein said hard plastic cap comprises a cap base part, a protection cover covering said cap base part, and a binding part connecting said protection cover to said cap base part;
• wherein said cap base part comprises a generally cylindrical drum part having an inwardly protruding part for engagement with an outwardly protruding flange of the mouth part of the container, and a top wall provided at a top end of said cylindrical drum part;
• wherein said top wall has a window part formed therethrough;
• wherein said protection cover comprises a top plate mounted over the top wall of said cap base part and has an area larger than an area of said window part so as to cover said window part and at least a portion of said top wall outside of said window part;
• wherein said binding part comprises plural bridging parts securing said top plate to said top wall in such a manner that said top plate can be readily detached from said top wall of said cap base part by imposing a force in a predetermined direction to break said bridging parts;
• and
• wherein said bridging parts connect between an outer edge of the window part and a lower end of said top plate.