Abstract: A method for providing a web (30) of flexible, plastic packaging material with a succession of dimples (9) forming indentations for straw insertion, comprising feeding the web (30) of packaging material through a first nip (52) defined by a first pair (51) of rotating rollers, and cyclically engaging the web (30) from a first side (31) by a protrusion (55) supported by a first roller (53) of said first pair (51) of rotating rollers for forming the succession of dimples (9) in the web (30) of packaging material. The invention also relates to a corresponding apparatus and a flexible pouch package comprising a dimple.

Abstract: A gas to gas heat exchanger 110 is equipped with a heat transfer element cleaning system 160, effluent collector hopper 162 and effluent collector hopper cleaning system 164. The heat transfer element cleaning system 160 is useful to remove accumulated substances from the heat exchanger 110 heat transfer elements 134. The effluent collector hopper 162 is useful to capture a cleaning fluid used to remove accumulated substances from the heat exchanger 110 heat transfer elements 134. The effluent collector hopper cleaning system 164 is useful to remove accumulated substances captured with the cleaning fluid from the effluent collector hopper 162 to prevent clogging thereof.

Abstract: A gas to gas heat exchanger 110 is equipped with a heat transfer element cleaning system 160, effluent collector hopper 162 and effluent collector hopper cleaning system 164. The heat transfer element cleaning system 160 is useful to remove accumulated substances from the heat exchanger 110 heat transfer elements 134. The effluent collector hopper 162 is useful to capture a cleaning fluid used to remove accumulated substances from the heat exchanger 110 heat transfer elements 134. The effluent collector hopper cleaning system 164 is useful to remove accumulated substances captured with the cleaning fluid from the effluent collector hopper 162 to prevent clogging thereof.

Abstract: A gas to gas heat exchanger 110 equipped with heat transfer element cleaning system 160, effluent collector hopper 162 and effluent collector hopper cleaning system 164 is provided. The heat transfer element cleaning system 160 is useful to remove accumulated substances from heat exchanger 110 heat transfer elements 134. The effluent collector hopper 162 is useful to capture a cleaning fluid used to remove accumulated substances from heat exchanger 110 heat transfer elements 134. The effluent collector hopper cleaning system 164 is useful to remove accumulated substances captured with the cleaning fluid from the effluent collector hopper 162 to prevent clogging thereof.