A faceblank (5) for a respiratory protective device or face mask hygiene product (1), where the shape of the faceblank (5) defines a number of filter openings (2, 3, 4) and which further comprises a head harness (6) or fastening for a head harness (6) and is characterised in that the filter openings (2, 3, 4) have been implemented to comprise a tongue (7), most advantageously so that the edge of each opening (2, 3, 4) is composed of a tongue. The faceblank is used with a number of replaceable filters (10) adapted in the filter openings (2, 3, 4) of the faceblank (5), each filter (10) comprising a filter part (11) and a frame (12) that encircles the filter part (11), in which frame (12) the outer edge has been implemented to comprise a groove (13)most advantageously so that the outer edge of each frame (12) consists of a groove (13)so that the filters (10) are fastenable to the filter openings (2, 3, 4) of the faceblank (5) by means of a tongue-and-groove connection, in which case the tongue (7) and groove (13) form an air-tight tongue-and-groove connection. Further independent claims directed to filters and methods for the manufacture of reinforced textile part, nonwoven fabric part or their combination part.

An optimization method for molding mold and filling process of resin transfer molding (RTM) to form fiber fabric reinforced resin-based composite parts is provided. A simulation platform is used to simulate the mold filling process of RTM process. Brinkman equations are used to describe a flow of resin in fiber fabric. Numbers and positions, process parameters and material parameters of an injection gate and a discharging gate of the molding mold are set, and then the mold filling process is simulated. Darcy's law is utilized to determine a required time and a mold filling effect of the mold filling with the resin. Finally, a molding mold structure and the filling process of RTM to form fiber fabric reinforced resin-based composite part with high production efficiency and good quality are obtained.