Abstract: A plunger press produces compressed bales of forage, straw, biomass or fibrous mass for agricultural and/or industrial use. The press includes a bale case, a reciprocating plunger structure, at least one material feeding duct laterally leading into a material charge feeding section of the bale case, and at least one plunger structure drive mechanism. The plunger structure compresses respective material charges fed from the feeding duct into the bale case. The plunger structure is subdivided perpendicularly to a reciprocation direction of the plunger structure in the bale case into at least two structurally separated compression surfaces. Each of the compression surfaces is smaller than a cross-section area of the bale case. The compression surfaces are driven substantially parallelly in the reciprocation direction and with a time shift in relation to each other to alternatingly compress material on partial surfaces of the cross-section area.

Abstract: In a plunger press (P) for producing compressed bales, the plunger press (P) comprising a bale case (1) accommodating a linearly reciprocating plunger structure (11), a material feeding duct (9) laterally leading into the bale case (1), and a plunger structure crank mechanism (14) driven by a drive source, the plunger structure (11) compressing a respective material charges (23) fed into the bale case (1) against a material strand (4) of at least one already compressed material charge, and linearly stepwise shifting the compressed material strand (4) in the bale case by overcoming a back pressure of the material strand, the plunger structure (11) having at least two structurally separated compression surfaces (A1, A2) each being smaller than a cross-section area (A) of the bale case (1), the compression surfaces (A1, A2) being parallelly driven in the linear reciprocation direction and relative to each other with a time shift (T).