Anonymous Modernist 19835

Hi chaps I've just bought a JML (I'm in UK) sealer, in the hope that I could blanch veg from the allotment and then keep it in the fridge for longer than in tupperware, the instructions even mentions soup but when I have tried sealing some blanched runner beans (that I'd squeezed dry) but when the vacume operates it sucks water as well as air and this gets between the two sides of the plastic bag and stops it sealing ... am I missing something please ? Roger