The present invention relates to a portable adhesive dispensing appliance with adjustable duty cycle. The RTL representation of the system includes pipelined delays to facilitate timing of the system as implemented on a target device identified by a designer. If the stunning condition of the animals is not optimum, it is easy to prolong or shorten the conveying time andor the conveying route through the stunning chamber. 0 WI, and said monomer gas comprising one or more types of monomers which is plasma polymerized onto the surface to thereby provide the surface of the solid substrate with chemically reactive groups.