Kunststoffschweißtechnik
Starting
and
operating
Chapter 5
10.12.2013 Working
instructions
WIDOS PSM 20
Page 21 of 31
5.2. Welding
process
T h e r e s p e c t i v e l y v a l i d w e l d i n g p r e s c r i p t i o n s ( I S O / C E N / D V S . . . ) a r e t o
b e b a s i c a l l y f o l l o w e d .
Do wear safety gloves as a protection against burning!
A stop-watch must be available for recording the actual times for heating and cooling.
A welding table must be available from which the parameters for the sheet dimensions to be
welded prescribed by the welding prescriptions may be taken.
The surface of the heating element has to be clean, especially free of oil, and has to be
cleaned before every welding process resp. if it is dirty with non-fibering paper or cleaning
agent (e.g. PE - cleaner). The ant-stick coating of the heating element has to be intact.
Slew the heating element to the lower position, turn it on and adjust the needed welding
temperature at the adjusting screw at the handle (see point 4.1 No. 20).
- When the green control lamp is blinking (21), the desired temperature is reached and
stays stable with the help of a pulse-interval relation.
The sheets have to be clean and free of oil in the welding area.
Open the both clamping beams with foot valves.
Insert the first plastic sheet below the clamping beam, parallel to the support, and fix the
clamping beam by the corresponding foot switch (see chapter 4.2).
Insert the second plastic sheet below the other clamping beam, align the sheet to the first
one and fix the clamping beam by the corresponding foot switch.
Close the tables, <valve lever> on “FORWARDS“, thereby reading the
movement
pressure
on the manometer. The movement pressure is displayed exactly when the slide
with the clamped sheets passes over into its movement.
Check sheet displacement and crack at the ends of the nudging sheets. According to
DVS 2207 the displacement of the tolerated crack may not be larger than 0,5 mm.
-
The mismatch compensation is done by releasing the clamping beams with the foot
switches and by shifting the plastic sheets. Afterwards, fix the clamping beams again
using the foot switches.
Take the adjusting force for the sheet dimensions to be welded out of the table. Add the
movement pressure.
Set the resulting pressure value at the pressure relief valve and check it by actuating the
<valve lever>.
Take the heating up time, max. change-over time, cooling-down time and height of bead for
the sheet dimensions to be welded out of the table.
Open tables again slightly, <valve lever> on “BACKWARDS“.
Slew in the cleaned heating element when it has reached the desired temperature. If
necessary wait until the control lamp smoothly blinks.
You must insert the spacer now during angle welding (chapter: 4.3).
