Membrane laminate

An ultrafiltration device, comprising:

• a plurality of porous ultrafiltration membranes, wherein the plurality of porous ultrafiltration membranes is made of a polymeric material selected from the group consisting of polysulfone, polyethersulfone, blends thereof and/or copolymers thereof;
• a first support plate and a second support plate, each of the first support plate and the second support plate formed of polyvinylidene fluoride, the first and second support plates each having a first surface facing each other and a second surface opposite the first surface of each support plate;
• wherein the plurality of porous ultrafiltration membranes are heat bonded to the first surface of said first support plate along a sealing line such that molten polyvinylidene fluoride infiltrates into pores of the porous ultrafiltration membranes and, optionally, wherein at least one second support plate comprises a porous ultrafiltration membrane;
• a thermal bond between the first support plate and the second support plate, wherein the thermal bond forms a liquid tight seal outside the sealing line on each first support plate, wherein the number of porous ultrafiltration membranes is in a number equal to the number of the first support plates;
• and
• at least one port, the at least one port formed from the first surface to the second surface of each the first support plate and the second support plate.