METHOD AND DEVICE FOR PRODUCING COMPOSITE NONWOVENS BY MEANS OF HYDRODYNAMIC NEEDLING

摘要

A known method exists for producing a composite nonwoven from at least one carded nonwoven and a wood pulp layer placed on said carded nonwoven, for producing a hygiene product. According to this method, the carded nonwoven i s hydrodynamically needled before the pulp layer is applied in order to increa se the resistance of the nonwoven. However this means that the nonwoven is wet when the pulp layer is applied. The moisture is disadvantageous for the circulation and therefore, the distribution of the pulp. The carded nonwoven still has to be consolidated in order to achieve sufficient resistance to we ar by friction. According to the invention, this problem is solved by subjectin g the carded nonwoven to action by air or calendering the carded nonwoven befo re it is coated with the super-absorbent material in order to pre-consolidate said carded nonwoven. The wood pulp layer is applied and the two are then consolidated together by hydrodynamic water needling and dried. This may be followed by additional calendering.