The present invention relates to polymer compositions comprising at least one basic additive, and processes comprising at least one process step to obtain the polymer composition or articles comprising the polymer composition. The polymer composition generally displays an enhanced biodegradability.

A filter element (20) includes individual components (2, 4, 8), such as a filter medium (8) as one component and further filter element components (2, 4), of which at least one component (4) is made of a material that is at least partially transparent to laser light and at least one further component (2), in the manner of a barrier layer, is made of a material that is at least partially opaque to laser light to perform a transmission welding method by laser light for connecting associable components to each other. At least some of the components of the filter element that are exposed to the laser light during the transmission welding method are at least partially electrically conductive.

According to some aspects, a method is provided of removing debris from a liquid photopolymer in an additive fabrication device. According to some embodiments, a mesh of solid material may be formed in an additive fabrication device from a liquid photopolymer, and particles of debris present in the liquid photopolymer may adhere to the mesh. The debris may thereby be removed from the liquid photopolymer by removing the mesh from the additive fabrication device. The mesh may then be discarded.

To provide a porous molding that can be used as a molding that has sufficient strength to be self-supportable even when the dimensions change due to absorbing water and that can be suitably used as a filter for removing impurities in a liquid or gas. A porous molding is achieved by sintering a mixed powder including a dried gel powder and a thermoplastic resin powder, wherein the ratio of average particle diameter d.sub.1 of the thermoplastic resin powder to the average particle diameter d.sub.2 of the dried gel powder d.sub.2/d.sub.1 is 1.3 or greater, and the difference ratio of average particle diameter d.sub.1 of the thermoplastic resin powder to the average particle diameter d.sub.2 of the dried gel powder and the average particle diameter d.sub.3 of the dried gel powder when absorbing water and swelling is (d.sub.3−d.sub.2)/d.sub.1 is 4.0 or less.

Contaminants present in air ducts or other components of HVAC systems may be carried by moving air passing through the HVAC system and ultimately delivered as air contaminants to rooms in which such contaminated air may be breathed in by humans. An air filter system is described for removing air contaminants from moving air passing through a register or grille between an air duct of a HVAC system and a room. The air filter system includes one or more air filters within an interface housing or secured by a frame that is attached or adhered to the register or grille so that the air filter removes at least some of the air contaminants in the moving air passing from the air duct through the register or grille before it enters the room. Methods for assembling and manufacturing air filter systems are also described.

An end cap for a pressure vessel has at least one part for connecting the end cap to a housing. The at least one part comprises a number of recesses. The recesses are arranged to form at least one fluid passage between an inside and an outside of the end cap when the end cap is plugged on the housing. A housing for a pressure vessel has at least one counterpart for connecting an end cap to the housing by engaging a part of the end cap. The at least one counterpart comprises a number of recesses. The recesses are arranged to form at least one fluid passage between an inside and an outside of the housing when the end cap is plugged on the housing. A method for leak testing a pressure vessel and a method for checking a connection between at least one end cap and a housing of a pressure vessel for leak tightness are also described.

A recess plate designed for use in a filter device for filtering a suspension includes a stationary head piece and a movable end piece, and a pack including copies of the recess plate, having a filter chamber inside the pack, adjoining the recess plate, having a first pipe for filling the suspension into the filter chamber, having a filter cloth for collecting a solid content out of the suspension, and having a second pipe for discharging a liquid fraction of the suspension out of the filter chamber as a filtrate, wherein the filter device may be closed before filtering by forcing the end piece in direction of the head piece, and opened after filtering by releasing the end piece, and moving the end piece away from the head piece for removing the filter cake from the filter cloth.

The invention concerns a circuit comprising a bag (11) comprising two flexible films (45, 46) and a press (10) comprising a first (14) and a second (13) shell clamping the bag to form pipes having a passage and edges (41); the first shell comprising a valve (20) which comprises a movable member (24) and a pad (31), which pad has a resting configuration in which a second face (33) of the pad is concave and locally delimits a channel (18) and a pinching configuration in which the second face (33) is convex; said movable member and said pad being configured so that, when said valve is in closed position and said pad in pinching configuration, said passage is pinched by said movable member against said second shell channel and said edges (41) are pinched flat by said movable member against said second shell (13).

A sheet filter membrane is arranged on a surface of a filter plate of a thermoplastic resin, and a plurality of projections provided in a hot plate is pressed against the filter plate above a periphery of the filter membrane with different timing for each of the projections to abut on the filter membrane. A plurality of recessed bonding portions with different depths are thus formed in the filter plate, and the filter membrane is bonded to the filter plate by heat welding in each of the recessed bonding portions. Sealing is therefore provided between the filter membrane and the filter plate along the periphery of the filter membrane.

To provide an injection mold capable of filling a necessary resin material for obtaining a desired molded article in a cavity space of a fine mesh structure, there is provided an injection mold according to an embodiment of the present invention composed of a core mold and a cavity mold, in which a cavity space is formed when the core and cavity molds are in a contact with each other, the cavity space surrounding a plurality of contact areas between the core and cavity molds. In the injection mold according to an embodiment of the present invention, at least one of the core and cavity molds has a through-hole which has an opening in a parting plane of the core and cavity molds and extends from the opening to an outside of the injection mold, the parting plane corresponding to the contact areas between the core and cavity molds.