Essential conditions for good GAS singeing:

There are three essential conditions for good singeing. These are:

• A flame with high mechanical & thermal energy quickly burn thermoplastic protruding fibres (e.g. polyester) without any molten beads formation  
• A homogeneous flame with uniform mechanical & thermal energy results in uniform singeing
• An optimal flame - fabric contact time to neither result in incomplete not over-singeing

Testing  effectiveness of singeing:

The effectiveness of singeing process can be checked by one or more of the following methods:

• By looking at the singed fabric with magnifying glass and comparing its hairiness with that of the un-singed fabric. A well-singed fabric shows less hairiness.
• By testing the singed fabric for pilling performance and comparing it with that of the un-singed fabric. A well-singed fabric gives less pilling.
• By sticking and removing a sticking tape on the singed fabric and observing the number of fibres attached to the sticking side of the tape. A well-singed fabric results in less number of fibres sticking on the tape.
• Noticing the feel or handle of the singed fabric. An over-singed fabric may give a harsher feeling.