JPH0318177Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a lower roll of a single facer for manufacturing single-sided corrugated board.

Problems to be solved by the conventional technology and invention As shown in Fig. 3, the conventional lower roll has the following problems:
A plurality of circumferential grooves 12B are provided on the surface circumferential surface 11B at appropriate intervals and groove bottoms 121B are provided lower than the roll groove portions 111B. A suction hole 13B of each circumferential groove 12B is connected to a plurality of horizontal holes 15B drilled from the end surface 14B over the entire width in the axial direction, so that the horizontal holes 15B can be connected to a vacuum suction device 16B. As shown in FIG. 4 (Japanese Utility Model Publication No. 59-1790), a plurality of circumferential grooves 12C are circumferentially surrounded by a plurality of circumferential grooves 12C provided at appropriate intervals on the surface circumferential surface 11C with groove bottoms 121C lower than the roll grooves 111C. A plurality of horizontal holes 1 are formed from the end surface 14C over the entire width in the axial direction.
5C and a circumferential groove 12 at the top of each horizontal hole 15C.
There is a roll that directly communicates with the groove bottom 121C of C and allows the horizontal hole 15C to be connected to the vacuum suction device 16C from the end surface 14C. The vacuum suction force becomes weaker as the position moves further away, and therefore, the circumferential grooves 12B and 12C that are farther away from the vacuum suction devices 16B and 16C cannot effectively suction and hold the core paper, so the exhaust device for vacuum suction is extremely difficult. A large amount of power is required, and normal power does not have enough suction power, so the centrifugal force of the roll rotation causes the wound core paper to rise from the roll surface, resulting in incomplete tier formation, uneven gluing, and There was a drawback that the quality of the single-sided corrugated board sheet deteriorated due to insufficient lamination of the liner paper. The present invention provides a single facer lower roll that solves the above problems.

Means for Solving the Problems The present invention, as shown in FIGS. 1 and 2, consists of a plurality of circles in which groove bottoms 121 are provided at appropriate intervals on the roll surface 11 and are lower than the roll grooves 111. Circumferential groove 1
2 in the circumferential direction, and the groove bottom 1 of the circumferential groove 12
In the lower roll of the single facer, in which the core paper (not shown) wound around the roll surface 11 can be sucked and held from the opening 120 of the roll surface 11, the inside of the roll near the roll surface 11 is A plurality of extending tapered negative pressure holes 15 are provided, and
A roll hollow portion 16 is provided inside the roll near one roll end surface 14, and the openings 120 of the plurality of circumferential grooves 12 lined up in the roll axis direction are formed by the negative pressure holes 15, respectively. Hollow part 1
6.

In the present invention, the negative pressure hole 15 is configured such that when vacuum suction is performed from the rear end 152, the suction pressure at a position within the hole close to the front end 151 does not become lower than the suction pressure at a position within the hole near the rear end 152. It is formed into a tapered shape.

Function and Effect of the Invention The rear end 152 of each negative pressure hole 15 of the lower roll of the present invention
If vacuum suction is applied from the circumferential groove 12, the suction force of the circumferential groove 12 can uniformly suction and hold the core paper even if the circumferential groove 12 is located away from the end face 14, with the same suction force as the suction force of the circumferential groove 12 near the end face 14. Single-sided corrugated cardboard does not suffer from product unevenness due to quality deterioration.

Example As shown in FIGS. 1 and 2, this example is a lower roll that can hold core paper by suction and can be heated with steam. Reference numeral 12 indicates groove bottoms at appropriate intervals on the roll surface 11. 121 is a circumferential groove provided lower than the roll groove 111; 13 is a suction hole bored from the opening 120 in the groove bottom 121 of the circumferential groove 12; 15 is a suction hole located inside the roll near the roll surface 11; Over the entire width in the axial direction, the leading end 151 is tapered, the rear end 152 is connected to a vacuum suction device (not shown), and communicates with the roll hollow part 16 provided inside the roll near the roll end surface 14, as well as each circumferential groove 12. A negative pressure hole 17 communicates with the suction hole 13 of , a drain discharge pipe 18 communicates with a roll hollow part 16 provided inside the roll near the roll end surface 14 . Note that 20 is an integrally molded part that is fitted inside the roll.

[Brief explanation of drawings]

1 and 2 show an embodiment of the present invention,
FIG. 1 is a sectional view, FIG. 2 is an enlarged sectional view taken along line 19-19 in FIG. 1, and FIGS. 3 and 4 are sectional views showing conventional examples. DESCRIPTION OF SYMBOLS 11...Roll surface surface, 111...Roll corrugated valley part, 12...Circumferential groove, 120...Opening, 121...
... Groove bottom, 14 ... Roll end surface, 15 ... Negative pressure hole, 16 ... Roll hollow part.

Claims (1)

[Scope of utility model registration request] A plurality of circumferential grooves are provided on the roll surface circumferential surface at appropriate intervals and the groove bottoms are lower than the roll corrugated valleys, and the grooves are wound around the roll surface from the openings of the groove bottoms of the circumferential grooves. In the lower roll of a single facer that can hold the core paper by suction, multiple tapered negative pressure holes extending in the roll axis direction are provided inside the roll close to the roll surface, and close to one roll end surface. A roll hollow part is provided inside the roll, and the openings of the plurality of circumferential grooves arranged in the roll axis direction are each communicated with the roll hollow part through the negative pressure hole. Lower roll of single facer.