Products » Sintofoil Membrane Welded Field Seam Technology

Equipment

PRELIMINARY NOTES

a) Correctly executed field seams are obtained by maintaining optimum relationship between temperature, speed and pressure. This combination is most consistently achieved by the use of automatic welding equipment. It is recommended that manual welding is limited to detail work or to jobs with specific conditions which prohibit the use of automatic equipment.

b) Field experience has demonstrated that in most cases, best seam performance was obtained with the following settings

Temperature:

350°C

Speed:

2 m/min

Weight:

standard

c) A 20mm safety margin is included in the minimum required width of the membrane overlap as indicated below. Such margin is recommended to avoid having unsufficient overlap due to sheet movement after initial alignment of the overlapping sheets.

d) It is essential that the welding equipment is maintained in good working condition.
Regular cleaning and check is recommended

2.1 AUTOMATIC WELDING MACHINES

(E.G. Leister Twinny or similar)

Field experience demonstrates that most outstanding results are achieved with this type of equipment. However, as both top and bottom membrane layers are pressed together while being heated, this type of equipment is suitable for loose-laid systems only. The recommended minimum width of the seam is:

for single weld:

30 mm

for double weld:

2x10 mm

Double weld equipment is used for liners, when pressure control is required. A 10 mm or 15 mm wide channel is left between the rollers. Welding is executed in one pass.

The minimum recommended membrane overlap is:

for single weld 30 mm:

50 mm

for double weld with 10 mm channel:

50 mm

for double weld with 15 mm channel:

60 mm

Sintofoil Membrane

2.2 AUTOMATIC WELDING MACHINES

(E.G. Leister Varimat or similar)

This type of equipment is specially developed for mechanically attached systems but is also suitable for all other types of roofing and lining systems, provided the slope does not exceed 10%. The upper layer is applied on the bottom layer while being heated, then rolled.

The recommended minimum width of the seam is 30 mm.
Welding is executed in one pass.
The minimum recommended membrane overlap, which has to be adjusted according to the type of equipment used, is:

for loose-laid and adhered systems:

60 mm

for mechanically attached systems:

110 mm

Sintofoil Membrane
Sintofoil Membrane

2.3. HAND HELD WELDING TOOL

(E.G. Leister Triac or similar)
The recommended minimum width of the seam is 30mm.
Welding is executed in 3 steps:

spot attachment to ensure proper sheet alignment

at inside end of the seam to ensure instant temperature during step 3

edge termination (min.20 mm)

It is important to apply pressure with the roller at the same time heat is applied and maintain a 45° angle for both tools.

Sintofoil Membrane

The minimum recommended membrane overlap is:

for loose-laid and adhered systems:

50 mm

for mechanically attached systems:

100 mm

Sintofoil Membrane

2.4. EQUIPMENT MAIN CHARACTERISTICS

Automatic equipment: self-propelled equipment allowing for seams of various widths, with or without control channel, equipped with outside air temperature, speed and pressure control devices.

Power:

4.000 Watts

Temperature range:

20°C to 650°C

Speed:

0 to 12 m/min

Pressure:

up to 20 kg


Hand held equipment:hot air gun equipped with outside air temperature control device,fitted with 20 mm or 40 mm nozzle.

Power:

1.500 Watts

Temperature range:

20°C to 700°C

2.5.ACCESSORIES

Thermometer allowing for reading up to 450°C

30mm wide pressure roller for hand welding

Probing tool

Wire brush for cleaning of nozzle and air intake

3x2,5 and heavier gauge power cords (ground fault interrupters recommended)

Weight plates for sheet alignment

Portable generator (when required)

Standard roofing/lining works equipment