Mitsubishi Jukogyo Kabushiki Kaisha

Mitsubishi Heavy Industries Limited

Makoto Ando

Yukuharu Seki

Hiroshi Ishibuchi

Kazukiyo Kohno

Tadashi Hirakawa

Kuniaki Wakusawa

Hiroyuki Takenaka

Takashi Nitta

Yoshiaki Maruyama

Toshiaki Miura

Makoto Yoshida

Hideo Nobuhara

Kouji Hattori

Kohshi Tanimoto

Kazukiyo Kouno

The present invention relates to a method capable of certainly correcting a phase shift between a plurality of core paper layers. In the method according to this invention, the next phase shift quantity &dgr;&prime;,is estimated on the basis of a previous measured phase shift value &dgr;,and the present measured phase shift value &dgr;,and a single-faced corrugated fiberboard sheet tension changing quantity &Dgr;T,for correction of the next phase shift quantity &dgr;&prime;,estimated is calculated to adjust the tension to the single-faced corrugated fiberboard sheet on the basis of the calculated tension changing quantity &Dgr;T,. This invention is effectively applicable when, for example, manufacturing a two-layer core single-faced corrugated fiberboard sheet or the like.

Phase control method and system for corrugated fiberboard sheet comprising a plurality of core paper layers

The present invention relates to a corrugator and corrugated fiberboard sheet manufacturing method which are capable of accurately adjusting the quantity of moisture included in a sheet to certainly suppress the warp deformation of the sheet with the passage of time. The corrugator has an adhering section equipped with a plurality of pressurizing units separately disposed in series along a sheet conveying direction, where a front linerboard and a rear linerboard are adhered to each other to form a corrugated fiberboard sheet and the corrugated fiberboard sheet formed in the adhering section is processed into a predetermined configuration in a processing section standing on the downstream side of the adhering section. The corrugator comprises sensors placed on the upstream side of the processing section for detecting moisture content conditions of the front linearboard and the rear linerboard, respectively, moisturizing units provided on the upstream side of the sensors and on the downstream side of the adhering section for directly supplying moisture to surfaces of the front linerboard and the rear linerboard and a controller for setting moisture quantities to be supplied from said moisturizing units on the basis of detection information from said sensors.

Corrugator and corrugated fiberboard sheet manufacturing method

The present invention relates to a sheet tension adjusting method which allows the tension to a single-faced corrugated fiberboard sheet or a liner to be greatly adjusted with a high accuracy to be capable of the adjustment of upward or downward warps of the corrugated fiberboard sheet. In the method according to this invention, when manufacturing a single-faced corrugated fiberboard sheet S.sub.1 in a manner that a liner L.sub.1 is adhered onto a corrugated sheet C.sub.1, the single-faced corrugated fiberboard sheet S.sub.1 is wound around one or more rolls 1 to change a braking force to the roll 1, thereby adjusting the tension to the single-faced fiberboard sheet S.sub.1. Further, this invention is effectively applicable in manufacturing various kinds of corrugated fiberboard sheets.

Sheet tension adjusting method and apparatus

The present invention relates to a single facer, which comprises a humidifying and heating unit placed on the upstream side of an air pressurization corrugating mechanism for humidifying and heating a corrugating medium and a feed mechanism for supplying the corrugating medium, processed by the humidifying and heating unit, to the air pressurization corrugating mechanism at a given speed. The corrugating medium is supplied at the given speed after the humidification and heating process for the corrugating medium, so that an air pressure to be taken at the corrugation is reducible and a predetermined flute configuration is maintainable. In addition, the spring back of the corrugating medium hardly occurs, which makes it possible to manufacture a corrugated fiberboard sheet with a high shock absorbing ability.

Single facer with angled medium feeding

A first tension adjustor for adjusting the tension of a liner and a pitch measuring device for measuring the corrugation pitch of a first core board of a single-faced corrugated board are used. A first tension controller operates so that the tension acting on the liner is adjusted on the basis of the corrugation pitch of the first core board of the single-faced corrugated board. Further, a second tension adjustor for adjusting the tension of the single-faced corrugated board and a phase shift measuring device for measuring a phase shift between the corrugations of the first core board of the single-faced corrugated board and the corrugations of a second core board to be laminated to the first core board are used. A second tension controller operates so that the tension acting on the single-faced corrugated board is adjusted on the basis of the phase shift measured by the phase shift measuring device. According to this construction it is possible to prevent a pitch shift and a phase shift of core board corrugations and there can be obtained a corrugated board of high quality.

Corrugated board manufacturing system

A glue application roll 1 rotating at a circumferential velocity v.sub.1 is moved to touch a downstream side corrugating roll (an upper corrugating roll) 9 rotating at a circumferential velocity v.sub.2 via a core paper 11 and, in response to variation in vibration, noise, drive torque or pressing reaction force of the glue application roll 1 caused thereby, a setting position of the glue application roll 1 to the downstream side corrugating roll 9 is adjusted, thus a gap between the glue application roll 1 and the downstream side corrugating roll 9 is maintained approximately at a thickness of the core paper 11.

Method and apparatus for single facer glue application adjustment

To provide a single facer glue application adjusting method and apparatus which enable 1 to prevent occurrence of defective sheet accompanying with operation mistake like negligence of setting change of roll gap in a change of papers, 2 to improve appearance of corrugated board sheet and to enhance quality of strength etc. of same and 3 to decrease manufacturing cost of a glue application adjusting apparatus. A glue application roll 1 rotating at a circumferential velocity v.sub.1 different from that v.sub.2 of a downstream side corrugating roll (an upper corrugating roll) 9 is moved to touch the downstream side corrugating roll 9 via a core paper 11 and, upon variation in the circumferential velocity of each said roll caused thereby, a setting position of the glue application roll 1 to the downstream side corrugating roll 9 is adjusted, thus a gap between the glue application roll 1 and the downstream side corrugating roll 9 is maintained approximately at a thickness of the core paper 11.

A single facer which includes a rotating corrugating roll for corrugating a medium; an endless belt for pressing a liner against the medium on the corrugating roll; at least a pair of belt rolls for running the endless belt; and a direction adjusting mechanism for changing the running direction of the endless belt with respect to the rotating shaft of the corrugating roll within the running plane of the endless belt to correct zigzag or sideway motion of the belt occurring while the belt is running; a detector for detecting sideway displacements of the endless belt; a computer for computing a positional correction to be made in the width direction based on a signal from the detector; and a controller for controlling the direction adjusting mechanism based on a value computed by the computer. In addition to the adjustment of the running direction of the endless belt, a tension balance between the opposite edges of the endless belt can be corrected by adjusting the relative angle between the shafts of the belt rolls.

Belt adjusting device and single facer

A product order specification change system for a corrugation machine having a slitter-scorer device and a plurality of cutoff devices for producing corrugated board sheets having various widths and lengths, includes a cutting apparatus wherein at an order change where specifications for the sheet width are changed from one order to the next, a region is formed between the leading end of the new order sheets and the trailing end of the old order sheets, wherein a transitional slit groove is cut connecting a slit groove of the old order sheets with a slit groove of the new order sheets. As a result, the web can be stably transferred through stages of the machine, the cutting dimension accuracy can be maintained precisely, and faults such as jamming can be eliminated.

Method and system for changing product specifications in a corrugation

The present invention reduces damages in a single-facer expected when foreign matters are bitten between a downstream side corrugating roll and an upstream side corrugating roll, achieves effective utilization of a peripheral space, and also improves a bonding strength between a core paper web and a corrugated paper web by maintaining a temperature of a single-faced cardboard sheet constant. A downstream side corrugating roll and an upstream side corrugating roll are formed in such manner that a pitch circle diameter of the downstream side corrugating roll may be larger than a pitch circle diameter of the upstream side corrugating roll and the ratio of the diameter of the downstream side corrugating roll to the diameter of the upstream side corrugating roll may be a predetermined integer ratio. Even in the event that a foreign matter such as a bolt has been bitten between the respective corrugating rolls, damages occurring on the both corrugating rolls are limited to a number of locations, and so, great reduction of a repair time can be realized. In addition, at least either one of a pressing force and a wrapping angle of an endless belt is regulated by detecting a surface temperature of a single-faced cardboard sheet with a temperature sensor and controlling a cylinder via a temperature regulator and an electro-pneumatic converter in response to the detection signal, and thereby the surface temperature of the single-faced cardboard sheet can be maintained constant.

Single-facer

An improved single-faced corrugated cardboard sheet making machine is provided, in which at the time of sticking a core paper web and a liner to each other in a single-facer equipped corrugating machine, impacts and vibrations are not generated, and hence troubles such as breaking of paper webs do not occur. The improvement resides in that the known single-faced corrugated cardboard sheet making machine having a pair of corrugating rolls for corrugating a core paper web into a wave shape and a pasting member for applying paste to corrugation crest portions of the corrugated core paper web, is further provided with an endless belt for pressing and sticking a liner to the core paper web applied with paste. The pressing condition of the endless belt can be adjusted, and a device for cleaning the surface of the endless belt is also provided.

Single-faced corrugated cardboard sheet making machine having an

An anvil cylinder is severed along an axial direction of a shaft into a plurality of ring-shaped sections, and elastic bodies are fixedly secured to parts of outer circumferential surfaces of the severed anvil cylinder sections over the entire length of the cylinder. In addition, the respective anvil cylinder sections are adapted to be individually engaged with or disengaged from a knife with the aid of a rotary object. By adjusting the positions of the anvil cylinder sections, slitting slots can be formed by machining only at the portions where slitting slots are necessitated.

Rotary shear

An improved rotary shear for performing slotting work or cutting work upon a corrugated cardboard web at right angles to its traveling direction for making order change easy and smooth, is disclosed. The rotary shear comprises a knife cylinder having a knife fixedly secured thereto over the nearly entire width of its outer circumferential surface, pressing means divided into a plurality of sections along the widthwise direction of the corrugated cardboard web and constructed in such manner that the respective sections can be individually raised and lowered, and an endless elastic body belt driven to travel at a predetermined timing with respect to the traveling corrugated cardboard web.

Growing community of inventors

Mihara, Japan

Makoto Ando