Abstract: An apparatus for diffusing wastewater into a clarifier is disclosed. The apparatus has a rotationally symmetric hollow body having a plurality of flow distributors positioned about a perimeter of the rotationally symmetric hollow body and a baffle extending around a bottom end portion of the rotationally symmetric hollow body. The apparatus is dimensioned to fit within an influent well of the clarifier and be connectable to the clarifier on a top end portion of the rotationally symmetric hollow body. A wastewater treatment system including a clarifier and the apparatus is disclosed. A method of retrofitting a circular clarifier by providing the apparatus is also disclosed.

Abstract: A continuous web of sheet material is fed through the lip of a first pair of driven pull rolls around a series of idler rollers and through the nip of a second pair of driven pull rolls. The pairs of pull rolls are selectively rotated to exert a desired tension on the web in a tension zone formed between the pairs of rolls. One pair of pull rolls operates as feed rolls to advance a preselected length of the web to a rotating cutter mechanism so that envelope blanks of a selected length are cut from the web for each revolution of the cutter mechanism. The feed rolls are operated by a servo-controlled motor responsive to an operator initiated signal to adjust the feed length without interrupting the feed of the web to the cutter mechanism. The second pair of pull rolls operates as tension rolls and is servo-motor controlled to maintain a preselected tension on the web fed to the cutter mechanism.

Abstract: A continuous web of sheet material is fed through the nip of a first pair of driven pull rolls around a series of idler rollers and through the nip of a second pair of driven pull rolls. The pairs of pull rolls are selectively rotated to exert a desired tension on the web in a tension zone formed between the pairs of rolls. One pair of pull rolls operates as feed rolls to advance a preselected length of the web to a rotating cutter mechanism so that envelope blanks of a selected length are cut from the web for each revolution of the cutter mechanism. The feed rolls are operated by a servo-controlled motor responsive to an operator initiated signal to adjust the feed length without interrupting the feed of the web to the cutter mechanism. The second pair of pull rolls operates as tension rolls and is servo-motor controlled to maintain a preselected tension on the web fed to the cutter mechanism.

Abstract: A pair of pull rolls unwind web material from a roll and advance the web at a preselected linear feed rate to a web cutting mechanism. The pull rolls are rotated at a preselected speed to generate the desired linear speed rate for cutting the web at selected intervals to produce blanks of a preselected length. The feed rolls are driven by a servo-motor which is operated by a controller that is microprocessor controlled. The controller is electrically connected to an encoder that is drivingly connected to a rotating knife cylinder of the web cutting mechanism. A selected length of blank to be cut from the web is inputted by the operator through a keypad to transmit a corresponding signal to the controller. In addition, the controller receives a signal from the servo-motor that drives the pull rolls, which signal is representative of the rate of rotation of the pull rolls.

Abstract: An envelope blank forming machine for forming generally rectangular booklet envelope blanks and generally diagonal envelope blanks on the same machine includes a pair of removable turnbars, adjustable pull rolls and an adjustable cutoff device. Preselected adjustment of these components provides a generally rectangular blank or a generally diagonally shaped blank. Retractable trim devices are provided in cutting relation with the blank when diagonal blanks are being formed. Seal flap cutters and first and second flap cutters are provided to form the booklet seal flap and bottom flap on the booklet envelope blank. These cutters are removed and replaced with seal flap corner cutters, bottom flap corner cutters and diagonal trim cutters when generally diagonal envelope blanks are being formed.

Abstract: An envelope blank forming machine for forming generally rectangular booklet envelope blanks and generally diagonal envelope blanks on the same machine includes a pair of removable turnbars, adjustable pull rolls and an adjustable cutoff device. Preselected adjustment of these components provides a generally rectangular blank or a generally diagonally shaped blank. Retractable trim devices are provided in cutting relation with the blank when diagonal blanks are being formed. Seal flap cutters and first and second flap cutters are provided to form the booklet seal flap and bottom flap on the booklet envelope blank. These cutters are removed and replaced with seal flap corner cutters, bottom flap corner cutters and diagonal trim cutters when generally diagonal envelope blanks are being formed.

Abstract: A stamped and scored one-piece container lid with an integral push-in tear tab has a tab-defining score line formed with a bottom wall, an inclined first side wall and a second side wall opposite to the first side wall and which is upset onto the bottom wall and the lower portion of the first side wall forming a ring around the latter with the result that the tab is relatively easy to push in, but is able to withstand an appreciable outward force due to pressure inside the associated container.

Abstract: A stamped and scored one-piece container lid with an integral push-in tear tab has a ridge embossed in the tear tab and a push location to the rear of the ridge. When the push location is depressed, the tab tears along its score line and rotates into the container. The ridge prevents the user's digit from sliding along the declining tab through the opening in the lid left by the tab and possibly contacting the sharp edge thereof. Special indentations may be formed in the lid at or near the opposite ends of the score line which make it easier to depress the tab to produce a large effective pour opening in the lid.

Abstract: A stamped and scored one-piece container lid with an integral push-in tear tab has a ridge embossed in the tear tab and a push location to the rear of the ridge. When the push location is depressed, the tab tears along its score line and rotates into the container. The ridge prevents the user's digit from sliding along the declining tab through the opening in the lid left by the tab and possibly contacting the sharp edge thereof. Special indentations may be formed in the lid at or near the opposite ends of the score line which make it easier to depress the tab to produce a large effective pour opening in the lid.

Abstract: A stamped and scored one piece push-in tear tab can lid has a beak embossed in the tear tab along with a finger or thumb push area to the rear of the beak. When the push area is depressed the beak tears the tab loose and rotates with the tab into the can, buckling at a hinge line between the tab and push area. As the user's digit applies pressure behind the opening and not over it as in prior constructions, there is little opportunity for the user's finger or thumb going into the opening.