The single facer includes a load-bearing frame for housing a first corrugating roller and a second corrugating roller, meshing with each other and mounted in the load-bearing frame. The single facer further includes a pivoting structure pivoted to the load-bearing frame about a pivoting axis and provided with a first guide roller and a second guide roller (35) pivotally supported for rotation on the pivoting structure. A continuous flexible member is guided about the guide rollers. Furthermore, provided for is a control system adapted to displace the pivoting structure to a working position, wherein the continuous flexible member is pressed against the second corrugating roller, and to a raised position, wherein the first guide roller and the second guide roller are spaced from the second corrugating roller.

A waterproof corrugated paper includes at least one stone paper medium and at least one stone liner paper, wherein the at least one stone paper medium includes a first fluting surface. A stone glue is utilized to adhere the at least one stone liner paper and several wave crests of the first fluting surface. The stone glue includes a linear polyolefin plastic material and an inorganic material. The linear polyolefin plastic material is 30 wt %-70 wt % based on the stone glue, and the inorganic material is 30 wt %-70 wt % based on the stone glue. The waterproof corrugated paper provided by the present invention is waterproof and frost-resistant, which is adapted to package cooled or frozen food. A manufacturing method, a manufacturing apparatus, and a usage of the waterproof corrugated paper are also provided in the present invention.

A corrugated cardboard plant comprises at least one device for producing a respective corrugated cardboard web laminated on one side; a lamination web dispensing device; a lamination web printing device disposed downstream of the lamination web dispensing device; and a device, disposed downstream of the lamination web printing assembly, for producing a corrugated cardboard web laminated on two sides from the at least one corrugated cardboard web laminated on one side and from a lamination web. The at least one device for producing a respective corrugated cardboard web laminated on one side is configured and/or disposed in such a manner that the at least one corrugated cardboard web laminated on one side, at least in a manner adjacent upstream of the device for producing a corrugated cardboard web laminated on both sides, has a respective upwardly directed corrugation. The lamination web in the device for producing a corrugated cardboard web laminated on two sides is guided in such a manner that said lamination web therein runs above the at least one corrugated cardboard web laminated on one side.

A waterproof corrugated paper includes at least one stone paper medium and at least one stone liner paper, wherein the at least one stone paper medium includes a first fluting surface. A stone glue is utilized to adhere the at least one stone liner paper and several wave crests of the first fluting surface. The stone glue includes a linear polyolefin plastic material and an inorganic material. The linear polyolefin plastic material is 30 wt %-70 wt % based on the stone glue, and the inorganic material is 30 wt %-70 wt % based on the stone glue. The waterproof corrugated paper provided by the present invention is waterproof and frost-resistant, which is adapted to package cooled or frozen food. A manufacturing method, a manufacturing apparatus, and a usage of the waterproof corrugated paper are also provided in the present invention.

A single facer including a first corrugating roller with a first rotation axis and a second corrugating roller with a second rotation axis. The two corrugating rollers form a corrugating nip, through which a paper sheet passes. The single facer also includes a pressing member, co-acting with the second corrugating roller and forming a pressure nip therewith, as well as a glue applicator co-acting with the second corrugating roller. With the second corrugating roller a suction box is associated, extending approximately parallel to the second rotation axis of the second corrugating roller and defining a suction area around the second corrugating roller. A series of laminar members, each of which is inserted in a respective one of the annular grooves of the second corrugating roller, are arranged between the pressing member and the first corrugating roller and extend in the respective annular grooves towards the suction box.

A single facer including a first corrugating roller with a first rotation axis and a second corrugating roller with a second rotation axis. The two corrugating rollers form a corrugating nip, through which a paper sheet passes. The single facer also includes a pressing member, co-acting with the second corrugating roller and forming a pressure nip therewith, as well as a glue applicator co-acting with the second corrugating roller. With the second corrugating roller a suction box is associated, extending approximately parallel to the second rotation axis of the second corrugating roller and defining a suction area around the second corrugating roller. A series of laminar members, each of which is inserted in a respective one of the annular grooves of the second corrugating roller, are arranged between the pressing member and the first corrugating roller and extend in the respective annular grooves towards the suction box.

A corrugated cardboard plant comprises at least one device for producing a respective corrugated cardboard web laminated on one side; a lamination web dispensing device; a lamination web printing device disposed downstream of the lamination web dispensing device; and a device, disposed downstream of the lamination web printing assembly, for producing a corrugated cardboard web laminated on two sides from the at least one corrugated cardboard web laminated on one side and from a lamination web. The at least one device for producing a respective corrugated cardboard web laminated on one side is configured and/or disposed in such a manner that the at least one corrugated cardboard web laminated on one side, at least in a manner adjacent upstream of the device for producing a corrugated cardboard web laminated on both sides, has a respective upwardly directed corrugation. The lamination web in the device for producing a corrugated cardboard web laminated on two sides is guided in such a manner that said lamination web therein runs above the at least one corrugated cardboard web laminated on one side.

The single facer includes a load-bearing frame for housing a first corrugating roller and a second corrugating roller, meshing with each other and mounted in the load-bearing frame. The single facer further includes a pivoting structure pivoted to the load-bearing frame about a pivoting axis and provided with a first guide roller and a second guide roller (35) pivotally supported for rotation on the pivoting structure. A continuous flexible member is guided about the guide rollers. Furthermore, provided for is a control system adapted to displace the pivoting structure to a working position, wherein the continuous flexible member is pressed against the second corrugating roller, and to a raised position, wherein the first guide roller and the second guide roller are spaced from the second corrugating roller.