Flexible building material bag e.g. cement bag, has laminate comprising layers connected with each other, and inner and outer layers permeable to air, where laminate is permeable to air, and is perforated

摘要

The bag (1) has a laminate (2) with layers (3, 5) as bag wall (6), where the layer (3) is a film, and the layer (5) is a fibrous web. The layers are made of polymer, and are connected with each other, and an inner layer (7) and an outer layer (8) are permeable to air. The fibrous web forms the outer layer, and the film forms the inner layer. The laminate is permeable to air, and is perforated. The perforation causes penetration of the film into the fibrous web. The laminate has air permeability according to EDANA 140.1. An independent claim is also included for a method for producing a flexible building material bag.