An apparatus for forming a seal (40-44) along an edge portion of a flexible package (10) that is made from a sheet of flexible material (137) includes an elongated film folding member (102) and at least one heating and/or sealing member (104), the at least one heating and/or sealing member (104) extending along a first heat/seal axis parallel to a lengthwise axis (108) of the film folding member (102). A first engagement end (112) of the film folding member is adapted to contact a portion of the sheet of flexible material (137) during a sealing process and the at least one heating and/or sealing member (104) is adapted to heat the portion of the sheet of flexible material (137) during the sealing process such that the contact between the first engagement end (112) and the portion of the sheet of flexible material creates the seal along the edge portion of the flexible package (10).

A counter-element for processing a material by means of ultrasound, the counter-element having a sealing surface, the sealing surface having a welding portion which is at least partially concavely curved. The sealing surface has a feed-in portion which is arranged adjoining the weld portion and is either not curved or is concavely curved with a radius of curvature that is larger than the radius of curvature of the welding portion.

A mesh to flexible screen frame laminator includes a first table with a horizontal surface and an alignment fence, a second table that is lower than the first table and a first pair of selectively driven heater rollers which are shiftable between a raised position and a lowered position relative to the first table. A cradle is located adjacent the first table and above the second table and at least a portion of the cradle is shiftable between a raised position and a lowered position, the raised position being substantially coplanar with the first table. A second pair of selectively driven heater rollers is shiftable between a raised position and a lowered position relative to the second table and is oriented transversely to the first pair of heater rollers. A third table is located adjacent the second table and at a height substantially coplanar with the second table.