A collapsible article comprising a plurality of foldably interconnected foldable sections/modules. The foldable sections can be part of cylindrical or conical surfaces. They can also be in the form of closing sections. When the foldable sections are part of tubular surfaces, either cylindrical or conical, they consist of four polygonal surface segments. The polygonal segments are curved/round in unfolded state and have a flat or approximately flat shape in partly folded and folded states. The folding process usually involves an abrupt transition between the unfolded and folded positions which makes the unfolded article almost as stable as non-foldable equivalents. The folding process usually requires application of force on the edges that form valley creases during folding.

A collapsible article comprising a plurality of foldably interconnected foldable sections/modules. The foldable sections can be part of cylindrical or conical surfaces. They can also be in the form of closing sections. When the foldable sections are part of tubular surfaces, either cylindrical or conical, they consist of four polygonal surface segments. The polygonal segments are curved/round in unfolded state and have a flat or approximately flat shape in partly folded and folded states. The folding process usually involves an abrupt transition between the unfolded and folded positions which makes the unfolded article almost as stable as non-foldable equivalents. The folding process usually requires application of force on the edges that form valley creases during folding.

A filter element has an upstream and downstream side. A filter media assembly of the filter element has an upstream side and a downstream side and has a first filter media layer and a second filter media layer that is adjacent to the first media layer. A substantial portion of the first layer and second layer are uncoupled, and at least one of the first media layer and second media layer comprises binder fiber. The second media layer has a mean flow pore size equal to or smaller than the first media layer. A support layer system is adjacent to the downstream side of the filter media assembly, and a first wire mesh layer is adjacent to the support layer system. At least the first media layer, second media layer, support layer system, and first wire mesh cooperatively define pleats at a pleat packing density of greater than 125%.

A filter element has an upstream and downstream side. A filter media assembly of the filter element has an upstream side and a downstream side and has a first filter media layer and a second filter media layer that is adjacent to the first media layer. A substantial portion of the first layer and second layer are uncoupled, and at least one of the first media layer and second media layer comprises binder fiber. The second media layer has a mean flow pore size equal to or smaller than the first media layer. A support layer system is adjacent to the downstream side of the filter media assembly, and a first wire mesh layer is adjacent to the support layer system. At least the first media layer, second media layer, support layer system, and first wire mesh cooperatively define pleats at a pleat packing density of greater than 125%.

Disclosed is a device for folding sheets, the device provided with two transport belts positioned opposite each other in such a way that sheets can be clamped between the transport belts with the exception of a protruding part that protrudes between the transport belts, whereby the device is provided with two slats that extend along the transport belts and between which the protruding part can slide so a strip protrudes between the slats, whereby the device is also provided with one or more folding elements along the transport belts that can fold the abovementioned strip over or around a slat to form a fold line and whereby the device is such that it guides the sheets with their strip along the folding elements and the slats by the driver of the transport belts.

Disclosed is a device for folding sheets, the device provided with two transport belts positioned opposite each other in such a way that sheets can be clamped between the transport belts with the exception of a protruding part that protrudes between the transport belts, whereby the device is provided with two slats that extend along the transport belts and between which the protruding part can slide so a strip protrudes between the slats, whereby the device is also provided with one or more folding elements along the transport belts that can fold the abovementioned strip over or around a slat to form a fold line and whereby the device is such that it guides the sheets with their strip along the folding elements and the slats by the driver of the transport belts.

A plurality of folding units is arranged in a circumferential direction of a drum that rotates about an axis. Each of the folding units includes: a pad for holding one part of a workpiece on a pad surface; a first folding member and a second folding member each having a folding surface for folding a different part of the workpiece so as to stack the different part over the one part; and a pivot shaft arranged parallel to the pad surface. The first folding member, the second folding member, and the pivot shaft are configured to be rotated together until the folding surface reaches a facing position and a facing posture at which the folding surface faces the pad surface. The pivot shaft is configured to be displaced in a diameter direction of the drum crossing the pad surface.

A filter element has an upstream and downstream side. A filter media assembly of the filter element has an upstream side and a downstream side and has a first filter media layer and a second filter media layer that is adjacent to the first media layer. A substantial portion of the first layer and second layer are uncoupled, and at least one of the first media layer and second media layer comprises binder fiber. The second media layer has a mean flow pore size equal to or smaller than the first media layer. A support layer system is adjacent to the downstream side of the filter media assembly, and a first wire mesh layer is adjacent to the support layer system. At least the first media layer, second media layer, support layer system, and first wire mesh cooperatively define pleats at a pleat packing density of greater than 125%.

A filter element has an upstream and downstream side. A filter media assembly of the filter element has an upstream side and a downstream side and has a first filter media layer and a second filter media layer that is adjacent to the first media layer. A substantial portion of the first layer and second layer are uncoupled, and at least one of the first media layer and second media layer comprises binder fiber. The second media layer has a mean flow pore size equal to or smaller than the first media layer. A support layer system is adjacent to the downstream side of the filter media assembly, and a first wire mesh layer is adjacent to the support layer system. At least the first media layer, second media layer, support layer system, and first wire mesh cooperatively define pleats at a pleat packing density of greater than 125%.

A folding device for a flat blank has a plurality of bearing blocks arranged in a row in a first direction, the mutual distance of which can be changed by a drive device and each of which has a support surface for the blank by a holding device. A plurality of folding blades are arranged at a distance next to one another in the first direction, at least one of the folding blades being arranged between immediately adjacent bearing blocks. The folding blades can be adjusted by changing a mutual distance with an additional movement component perpendicular to the blank. Adjacent bearing blocks are coupled in terms of movement via a linkage. The folding blade arranged between adjacent bearing blocks is connected to the linkage so a change in distance between the bearing blocks can be transferred by the linkage to the folding blade for the adjustment thereof.