TECHNOLOGY FOCUS - POLYMERS - Preferred Method: In manufacturing the membrane material, the vacuum means are initiated creating a vacuum distributed across the surface of the vacuum table, either before step (a) or before step (b) or before step (d). The vacuum after step (a) is set at between 0.1 and 0.5 bars, and that the vacuum after step (c) is increased to between 0.6 to 1 bar. The vacuum table is substantially horizontal, and where the table's plane defines an X and a Y axis, and where rails are arranged along two opposing sides of the table parallel to the Y axis, and where a first gantry is arranged for movement along the rails, which first gantry spans across the table parallel to the X axis, where an array of heating means are arranged along the first gantry in the X axis direction, the heating means directing their energy towards the table. Also, a set of temperature sensors are arranged along the length of the first gantry, which temperature sensors are connected to a control device, which control device in response to input from the temperature sensors controls the array of heating means, such that minimal temperature differences occur in the matrix. A second gantry is arranged parallel to the first gantry for travel on the rails along the sides of the table, where the second gantry is provided with means for allowing a yarn dispensing device to travel along the X axis of the second gantry, where the yarn dispensing device deposits an adhesively coated yarn in a predetermined pattern on the first material layer. The heating means are infrared heating sources, and where the control device provides constant voltage and current to the heating means, where input from the temperature sensors is used to pulsate the heat, such that the temperature in the core of the yarns are controlled between 115 degrees C and 150 degrees C. The temperature in the yarn is controlled such that the temperature on the surface of the yarn is slightly higher than the temperature in the core of the yarn.