SINGLE FACER FOR CORRUGATED BOARD

摘要

The invention relates to single facers for corrugated board of the kind comprising upper and lower corrugating rolls and a pressure roll, each of the rolls being formed by a hollow shell. The invention provides an improved design of high practical value in which noise in use is substantially reduced. The invention is characterised in that vibration reducing means (12, 12a, b or c, 17, 18 to 20, 21, 22, 22 to 24 or 25, 26) are provided and located in the hollow interior of at least one of the rolls (4, 5, 7 or 16), said means being maintained in intimate contact with the inner wall of the shell of said one roll, the arrangement being such that the frictional resistance between the inner wall of the roll and the vibration reducing means restricts elastic deformation of the roll, and hence restricts the level of noise caused by elastic oscillation of the roll. The vibration reducing means may comprise a coil (12), or other appropriate spring, or a coiled thin sheet (12a, b or c) maintained under pressure in contact with said inner wall of the shell. Alternatively, said vibration reducing means may comprise a number of cylindrical elements (17, 18 to 20, 21, 22, 22 to 24, or 25 26) maintained in contact with each other and pressing into contact with said inner wall of the shell.