Abstract: The invention relates to a flexible bulk-material container made of at least one woven blank of a synthetic strip-type material and to a method for the production thereof. In the seam areas (25),the woven blank (20.1) is provided with an overlapping or another woven blank (20.2) placed on top. An energy conversion agent 924) is inserted into the boundary layer (22) which is disposed between the overlapping and/or woven blanks placed on top (20.1, 20.2). The woven blank or blanks (20.1, 20.2) is/are melted by means of laser beams acting upon the energy conversion agent (24).

Abstract: The invention relates to a method for laser welding, wherein n plastic parts (1.1, . . . , 1.n) are pressed against each other, respectively forming a boundary layer (2.1, . . . , 2.n-1). An energy-converting medium (4.1, . . . , 4.n-1) is incorporated into each boundary layer (2.1, . . . , 2.n-1) and absorbs the light energy of at least one of several laser beams used (11.1, . . . , 11.m). Irradiation of the boundary layers (2.1, . . . , 2.n-1) by means of the laser beams (11.1, . . . , 11.m) respectively results in a partial melt, whereupon a welding seam point (3.1, . . . , 3.n-1) forms an inner link between the plastic parts (1.1., . . . , 1.n) upon cooling. The energy-converting media can be chosen according to type, coating thickness, etc., so that a melt is obtained upon simultaneous irradiation with two or more laser beams. In another embodiment of the inventive method, a laser beam (11.1) having a wavelength of ?1 is used, the light thereof being partially absorbed in a first boundary layer (2.