JPS60124241A - Method and device for bonding corrugated board sheet - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a corrugated pole sheet bonding method and sheet moisture adjustment device.

Conventionally, this is used to solidify the glue used to bond the corrugated top of the corrugated core to the liner, as well as to remove and adjust moisture from the corrugated pole sheet.

Heat treatment using high heat in a preheater, corrugated rolls, nip pressure rolls, hot plates, etc. was required.

However, such processing requires a large amount of thermal energy and has disadvantages such as destruction of the base paper material and warpage of the sheet.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks by sucking out and dehydrating the corrugated pole sheet by cooling, adjusting the moisture content, and promoting the initial adhesion of the adhesive.

Therefore, in the method according to the present invention, a low-temperature adhesive is applied to the corrugated top of the corrugated core, a band-shaped liner is crimped onto this corrugated core to form a corrugated pole sheet, and this corrugated pole sheet is dried. It is characterized by promoting the initial adhesion of the low-temperature adhesive and sucking out and dehydrating the moisture contained in the core by passing it through a cooling atmosphere. Further, the apparatus according to the present invention includes a belt conveyor mechanism for conveying a corrugated pole sheet formed by pressing the corrugated pole sheet formed by pressing the corrugated top of the corrugated core coated with a low-temperature adhesive and a strip liner; The cooling chamber is characterized by comprising a mechanism for injecting dry cooling air.

Next, preferred embodiments of the invention according to the present application will be described with reference to the accompanying drawings.

FIG. 1 shows a case where the present invention is applied to a single facer. Reference numeral 1 indicates the machine frame body, 2 indicates an upper roll, 3 indicates a lower roll, 4 indicates a nip pressure roll, 5 indicates a glue roll, 6 indicates a doctor roll for adjusting the glue adhesion amount, and 7 indicates a glue reservoir. In the apparatus shown in the figure, a synthetic adhesive that can be bonded at low temperatures is applied to the top of the corrugation, which is formed by corrugating a core that has passed through a pre-con and has been made to have appropriate moisture and temperature (30°C to 60°C). Vinyl acetate adhesive is adjusted to a temperature of 30° C. to 50° C., transferred to the top of the step by a glue roll 5, passed through a rotary preheater 16, and cooled to 0° C. to 15° C., liner base paper 12 and the inside thereof. The core is bonded with pressure using a nip-press roll 4. The single-tiered sheet 12' thus formed is
A pair of take-up belts 21a are installed in the cooling chamber 20 provided next to the single-stage sheet exit of the single facer.
.

21b. The take-up belts are provided so as to face each other in parallel, and the upper bell (21a) is stretched between rollers 22 and 23 like an endless belt and moves counterclockwise in the figure, while the lower bell (21a) The belt 21b is similarly stretched between rollers 24 and 25 in the form of an endless belt and moves clockwise in the figure. The take-up belt carries out the single-stage sheet from the single facer 1 by sandwiching the single-stage sheet 12' between them, and carries out the single-stage sheet from the single facer 1.
The top of the step and the liner 12 are also crimped.

Inside the cooling chamber 20, on both sides of the take-up belt 21,
A tubular member 26 is provided with a plurality of injection ports that eject dry cooling air at -10° C. to 10° C. (see FIG. 2). Preferably, the tubular member is arranged so as to blow dry cooling air over the entire surface of the single-tiered sheet from both sides of the center core side of the single-tiered sheet. Since a large number of ventilation holes are formed over the entire surface of the take-up belt, the drying cooling air evenly contacts the surface of the one-tiered sheet. The size of the ventilation hole is preferably lOm/mφ.

On the liner side of the take-up belt, there is a single stage sea) 12
A suction mechanism 27 is provided for sucking out the dry cooling air that hits the take-up belt.This suction mechanism has a large number of ventilation holes (preferably 1
/Ilφ), and the dry cooling air that hits the single-tier sheet is forcibly discharged from the folding and discharging mechanism 28 (see FIG. 3).

Next, a case where the present invention is applied to a double facer will be explained with reference to FIG. In the illustrated embodiment, reference numeral 30 is a double facer machine frame body, 5' and 5'' are glue rolls for the first and second single-tier sheets, respectively, and 34 and 35 are glue rolls for the first sheet, respectively. and a rider roll for the second single-tiered sheet.With this device, t±
, the third liner base paper 12'' passes through a rotary preheater 16'' and is cooled to between O'C and 15C.

On the other hand, the first single-tiered sheet 12' and the second single-tiered sheet 12'' are preheaters 16' and 16'', respectively.
It is made to have a temperature of 0°C to 15°C.

After passing through the auxiliary drum 31, a low temperature adhesive is applied to the outer corrugated top of the core by a glue roll 5'. Similarly, the second single-corrugated sheet 12'' passes through the auxiliary drum 32 and is coated with low-temperature adhesive on the outer corrugated top of the core by the glue roll 5''. In this case as well, the adhesive is applied at a temperature of 30° C. to 50° C., as in the case of the single facer.

In the cooling chamber 20', there are one upper and lower crimp conveyor belt 21'a.
and 21'b are provided, and the upper crimp conveyor belt 21'
a rotates counterclockwise in the figure as an endless belt around rollers 22' and 23', and the lower pressure-bonding conveyor belt 2
1'b rotates clockwise in the figure as an endless belt around rollers 24' and 25'. Reference numeral 29 indicates a group of guide rolls for the belt. A plurality of ventilation holes (preferably 10 m/mφ) are formed in the heald.

The first single-tiered sheet 12' coated with adhesive and the second
The single-tiered sheet 12'' is the position of the rollers 22' and 24' provided at the entrance of the cooling chamber 20' together with the liner 12'', and the press conveyor belts 21'a and 21'
b, and move to the right in the figure while being pressed together.

Injection devices 26a, 26b, and 26c made of tubular members each having an injection port for ejecting dry cooling air at -10° C. to 10° C. are provided near the side of the pressure-bonding conveyor belt.
(See Figure 5). The injection devices 26a, 26a are intended for rapid adhesion, and are used at -10°C during operation.
It blows out cold air at a temperature of 10°C to 10°C. The second and third spraying devices 26b, 26b, 26c, and 26c are for the purpose of complete adhesion and for adjusting the degree of sheet moisture, and the number of them can be selected depending on the sheet moisture detection result. The water content of the sheet is adjusted by appropriately operating the injection device using a regulating valve. In the illustrated embodiment, three sets of injection devices are provided, but the number of devices is not limited to this.

Reference numeral 28' indicates a forced suction outlet for discharging the dry cooling air applied to the corrugated pole sheet.

In addition, in the apparatus shown in Fig. 1 and Fig. 4, an automatic moisture measuring device is installed to measure the moisture in the corrugated pole sheet, and the strength of the drying cooling air is adjusted automatically or manually based on the measurement results. Of course, it is possible to adjust the temperature of the cooling chamber by doing so.

Thus, according to the present invention, the liner 12 or 1
2' and a stepped formed core 11 or single stepped sheet 12
’ or 12” are crimped, at -10°C to 1°C.
Since the adhesive is conveyed while being held between belts while being exposed to dry cooling air at 0°C, the initial adhesion of the adhesive is accelerated due to the temperature difference between the temperature of the adhesive and the temperature of the cooling air passing through the cooling chamber. Complete adhesion is promoted. In addition, the dry cooling air sucks out moisture from the corrugated pole sheet and de-ices it, making it possible to adjust the moisture content of the corrugated pole sheet.

This reduces the occurrence of washboards and warping of corrugated pole sheets, and also eliminates bonding defects caused by moisture content in corrugated pole sheets and adhesives, reducing box manufacturing losses. sell. Furthermore, even when thick materials are bonded together, there is no need to reduce the speed as was conventionally done, resulting in improved productivity.

Furthermore, in the past, the glue used for single facers and double facers was used by changing the mixing ratio of water, but with the present invention, this type of glue adjustment can be unified, which is extremely convenient. be.

Although the double facer shown in FIG. 4 is for manufacturing a double-sided stepped pole, it goes without saying that the principle of the present invention can also be applied to a double facer for manufacturing a double-sided stepped pole.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram when the present invention is applied to a single facer, and FIG. 2 is a longitudinal sectional view taken along line 2-2 of the cooling chamber of the apparatus shown in FIG. The rollers are omitted. Further, FIG. 3 shows a cross-sectional view taken along line 3--3 in FIG. 2, and the belt is omitted. FIG. 4 is a schematic diagram when the present invention is applied to a tuple facer. FIG. 5 is a cross-sectional view of the cooling chamber shown in FIG. 4, showing the mounting position of the injection device and omitting belts and the like. 11...Central core, 12 @12''...Liner, 12'-12''...Single corrugated board, 20/20'...
・Cooling room. 21a, 21b, 21'a, 21'b... Belt.

Claims (1)

[Claims] 1) Apply a low-temperature adhesive to the top of the corrugated core of the corrugated core formed in corrugated form at a low temperature, press the band-shaped liner to the corrugated core to form a corrugated pole sheet, and use this corrugated pole receipt as a corrugated pole sheet. , a method for adhering corrugated pole sheets, which is characterized by passing them through a dry cooling atmosphere. 2) A belt conveyor mechanism that conveys the crimped corrugated pole sheet, which is placed downstream of the crimped portion between the corrugated top of the corrugated core and the strip liner, which has been formed in tiers and is coated with a low-temperature adhesive; 1. A corrugated pole sheet bonding device, comprising a surrounding cooling chamber and a mechanism for spraying dry cooling air. 3) The apparatus according to claim 2, further comprising a suction mechanism that sucks out the cooling air that hits the corrugated pole sheet. 4) The heald conveyor mechanism consists of a pair of take-up belts that press and convey single-stage sheets formed on a single facer, and the injection mechanism includes a plurality of injections provided on both sides of the take-up belt. 4. The apparatus according to claim 3, wherein the suction mechanism comprises a tubular member having a mouth, and the suction mechanism is provided facing the liner side take-up belt. 5) The belt conveyor mechanism consists of a pair of belts that press and convey a corrugated pole sheet made by laminating another belt-shaped liner to a single sheet in a double facer, and the jetting mechanism is provided on both sides of the heald. The suction mechanism consists of a tubular member equipped with a plurality of injection ports, and the suction mechanism includes:
4. Device according to claim 3, characterized in that it consists of a forced suction outlet provided in the cooling chamber.