JPS6155876B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrugated board manufacturing apparatus, particularly to an improvement in the upper and lower corrugating rolls and liner base paper supply mechanism in a single facer.

In recent years, cardboard packaging boxes, which are made of paper, have become the main packaging material for small and medium-sized items due to their various advantages, such as their durability and ease of transportation.

In addition to speeding up the manufacturing process, conventional corrugated board manufacturing equipment requires corrugation processing of the core, and after gluing, the rolls must be heated to press them against the liner to speed up the drying of the glue and ensure complete adhesion. Iron rolls have been used due to the lack of availability. However, when these iron rolls are used, they sometimes emit high-pitched noise exceeding 100 phons, which not only causes noise pollution to the surrounding area, but also significantly deteriorates the working environment, reducing work efficiency and sometimes causing labor problems. There was a risk that it would lead to a disaster. Also, considerable thermal energy was required to heat the rolls.

Conventionally, measures have been taken to reduce noise, such as covering the single facer that generates the noise for sound insulation, and installing corrugated molded parts underground, but these methods require additional equipment costs, and It could not be a fundamental solution.

SUMMARY OF THE INVENTION An object of the present invention is to provide a single facer that can significantly reduce noise generation through slight modification without substantially changing the structure of the conventional single facer.

The above-mentioned and other objects include: a moisturizer portion that provides appropriate moisture to the continuously fed strip-shaped core; a preheater that provides a non-high temperature to the core;
In an apparatus having an upper roll and a lower roll for corrugating the core at low temperature, and a nip pressure roll for press-bonding the band-shaped liner, which is sent separately from the corrugated core, after applying an adhesive, the upper roll is used. At least one of the roll, the lower roll, and the nip pressure roll has a cavity in the axial direction, and the inner wall surface of the cavity is coated with a polyurethane resin. Ru.

Next, preferred embodiments of the single facer according to the present invention will be explained with reference to the drawings.

Figure 1 schematically shows a single facer, where 1 is the machine frame body, 2 is the upper roll, 3 is the lower roll, 4 is the nip pressure roll, 5 is the glue roll, and 6 is the glue adhesion amount adjustment doctor. 7 is a glue reservoir, and 8 and 10 are feed rolls. Further, the reference numeral 13 indicates a moisturizer portion, and the reference numeral 14 indicates a preheater for core raw paper. In the device shown in the figure, a strip-shaped core 11 is properly moistened through a moisturizer portion 13 and passed through a preheater 14 for 30 minutes.
The temperature is between 60°C and preferably 40°C. Next, the core 11 passes through the feed rolls 8 and the upper rolls 2 rotating in opposite directions.
And while passing through the engagement part of the lower roll 3,
The step is formed into a shape corresponding to the shape of the steps formed on both rolls. Glue is applied to the stepped core 11 at the contact portion between the lower step roll 3 and the glue roll 5. This glue is a synthetic adhesive that can be bonded at low temperatures.
For example, use vinyl acetate adhesive at 30℃ to 50℃.
Preferably, the temperature is adjusted to 40° C. to keep the viscosity and properties constant. On the other hand, the liner base paper 12 passes through the rotary preheater 16 and then passes through the upper and lower precooling rolls 9 and 17, which have cold air passed through their hollow parts, and is cooled to 0°C to 15°C. At the contact part of the nip pressure roll 4,
The corrugated medium to which glue has been applied is crimped and sent to the next step through a feed roll 10.

Conventionally, in this type of device, the main source of noise is the vibrational reverberation generated in the hollow parts of the upper roll 2 and the lower roll 3, as well as the contact part between the lower roll 3 and the nip pressure roll 4, in the hollow part of each roll. It was becoming.

In the present invention, the upper roll 2, the lower roll 3, and the nip pressure roll 4 are arranged in a cavity 2 in the axial direction.
e, 3e, and 4e are formed, and the inner walls of the cavity are coated with polyurethane resins 2f, 3f, and 4f to prevent vibrations and echoes from occurring (see Fig. 2).

The polyurethane resin layer provided on the inner wall surface may be adhered using an adhesive, or may be formed by molding on the inner wall of the roll. The thickness of the polyurethane resin layer should be sufficient to attenuate reverberant sound, but rather, the inner surface of the resin layer should have an irregular shape in order to prevent vibrations generated from the inner wall of the roll and the resonance phenomenon of reverberant sound. It is preferable to do so.

For the upper roll 2, the steps may be formed directly on the steel roll 2a, or a 20 to 30 mm hard urethane having steps 2d may be bonded to the outer periphery thereof. The lower roll 3 can be made of conventional steel, but if the upper roll 2 is a steel roll with corrugations formed directly on it, the lower roll 3 may be made of steel on its outer periphery. The steps to be provided are made of hard urethane. The lower roll 3 may be of a no-finger type, or may use fingers. The outer circumference of the lower roll may be the same as the conventional one, but increasing the outer circumference will reduce noise. The outer circumferences of the upper roll 2 and the lower roll 3 are the same, or the upper roll 2 is made smaller and the rotation ratio is the same. Step molding using materials such as steel and hard urethane resin has good conformability, so step forming can be performed without the need for the conventional pressurizing force, reducing noise generation.
The upper and lower corrugating rolls can be kept at room temperature and do not require the heat of 150°C to 170°C, which is the temperature of conventional corrugating rolls. The outer peripheral surface of the nip pressure roll 4 is coated or bonded with hard urethane resin 4c to a thickness of 10 to 25 mm. In addition, the nip pressure roll is 0°C to 15°C.
It shall be a rotary type with a temperature of °C. With this nip pressure roll, even though the pressurizing force required for crimping is less than that of conventional steel material rolls, the liner base paper 12
The purpose of bonding the step-formed core 11 is achieved, and at the same time, the adhesive and pressure bonding properties are excellent, and the abrasion resistance is also superior to steel materials.

As described above, in the single facer according to the present invention, the inner surfaces of at least one of the upper roll, the lower roll, and the nip pressure roll are coated with polyurethane, so that the noise generated by vibrations and reverberations of the rolls is significantly reduced. In addition, the compatibility of the hard urethane steps with the steel steps allows for reliable step formation even at room temperature, which eliminates various problems associated with high-heat use, such as poor work environments during the intense summer heat. It is possible to avoid burn injuries and burns caused by the roll stopping. In addition, since the application of the double side eliminates the need for a hot plate, less machine space is required and the equipment space for the double facer can be used more efficiently. Furthermore, the life of the machine is extended and it is advantageous in terms of maintenance, and even if the material of the machine is changed, the desired purpose can be achieved.

Furthermore, the liner base paper is cooled before being bonded to the stepped core.
The bonding speed using a synthetic adhesive that can be bonded at a low temperature difference can be improved, and the characteristics of this type of adhesive can be effectively utilized.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an embodiment of the single facer according to the present invention, and FIGS. FIG. 2 is a cross-sectional view showing one embodiment. 2...Upper roll, 3...Lower roll, 4...
Nip pressure roll, 2a, 4a... iron roll, 2
e, 3e, 4e...Cavity, 2c, 2f, 3f, 4
c, 4f...Polyurethane resin layer.

Claims (1)

[Scope of Claims] 1. A moisturizer section that provides appropriate moisture to the continuously fed strip-shaped core, a preheater that applies a non-high temperature to the core, and a step-processing process performed on the core at a low temperature. In an apparatus having an upper roll, a lower roll, and a nip pressure roll for press-bonding a band-shaped liner formed in stages and sent separately from the core after applying an adhesive, at least the upper roll, the lower roll, and the nip pressure roll are provided. One type is a single facer used in corrugated board manufacturing, which has a cavity in the axial direction and the inner wall surface of the cavity is coated with polyurethane resin. 2. At least the stepped portion of the upper roll is formed of a polyurethane material, and at least the surface of the nip pressure roll is formed of a polyurethane material,
The single facer according to claim 1, further comprising a mechanism for cooling the liner base paper. 3. The single facer according to claim 2, wherein the mechanism for cooling the liner base paper cools the base paper to 0°C to 15°C. 4 The preheater heats the center core to 30°C to 60°C.
2. The single facer according to claim 1, wherein the single facer is step-formed by heating to .