| 摘要 |
A mixing bag (4) Figure 6 comprises a mixing chamber in the form of a compartment (45), and a pocket (42) in the bag having a mouth opening (44) so that it can be filled with liquid (72) to a predetermined volume. The pocket is easily ruptured when the mouth is closed to discharge the volume of liquid into the compartment for mixing with a material (70) in the compartment. During mixing the walls (46, 47) of the pocket abut to serve as a non-return valve in the bag. Apparatus Figure 1 for making the bags includes web bonding means (10), feeding means (11) to feed film of waterproof thermoplastics material from rolls (12, 13 and 14) to the bonding means, via web splitting means (15) and a separator (16), and take up means (17) to wind bags onto rolls (18). The separator (16) enables mouths to be made between inner walls of the bags whilst the inner walls are seamed to adjacent outer walls. The apparatus forms the bags with open bottoms for insertion of the material for mixing and subsequent closure. <IMAGE> |
