JP2983965B1 - Corrugator - Google Patents

Abstract

An object of the present invention is to provide a cardboard upward warpage prevention device capable of effectively preventing a convex warpage of the cardboard. SOLUTION: A belt conveyor 8 which conveys a single-sided cardboard A in a flat state to a discharge end of a pair of clamping conveyors 6 and 7 which conveys a single-sided cardboard A discharged from a single facer 5 from both sides and conveys the cardboard A upward. Is provided. The shower device 10 is provided on the belt conveyor 8. Below the belt conveyor 8, there is provided a sheet conveying conveyor 9 for transferring the single-sided cardboard A at a lower speed than the belt conveyor 8, and a glue is applied to the top of the middle of the single-sided cardboard A discharged from the sheet conveying conveyor 9. When the single-faced cardboard A and the front liner c after the gluing are conveyed to the double facer 13 and bonded to each other, and the formed cardboard B is bent upwardly in a convex shape, the shower device 10 A back liner a of A is provided with moisture to prevent the cardboard B from warping.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a corrugator for the production of double-sided corrugated board or double sided corrugated cardboard, more particularly, with the warp prevention device of corrugated cardboard to be manufacturing co
About the Rugeta.

[0002]

In general, corrugator to produce a double-sided corrugated board or double sided cardboard, with a glue to the flute tips of the corrugated medium and stage molding, single to form a single-faced corrugated board and Ri allowed if the pasting the back liner to A heater device for preheating the facer, the single-faced cardboard manufactured by the single facer, a gluing device for gluing the top of the single-faced cardboard after preheating, and a surface liner attached to the single-faced cardboard after the gluing.
If allowed to form a double-sided corrugated cardboard Ri, or has a double facer for forming a double sided corrugated cardboard if allowed to Ri stuck and another single-faced corrugated board and table liner on one side corrugated board.

In the above-mentioned corrugator, a single-faced corrugated cardboard discharged from a single facer is sandwiched and conveyed obliquely upward at the same speed as the single facer. A sheet conveying conveyor that conveys cardboard is provided, and due to the speed difference between the sheet conveying conveyor and the pinching conveyor, single-sided cardboard is formed in a loop on the sheet conveying conveyor and stored, even if the manufacturing speed of the single facer is temporarily reduced. Even at low speeds, the stored single-faced cardboard is used so as not to affect the production speed of the double facer.

In the double facer, a heater device is provided on the upstream side of the gluing device in order to effectively bond the single-faced cardboard and the surface liner, and the heater device allows the single-faced cardboard and the surface liner to have a temperature suitable for bonding. To preheat.

A double facer for producing double-faced corrugated cardboard and double-sided corrugated cardboard (hereinafter, collectively referred to as corrugated cardboard) is provided with a transport belt downstream of a hot platen, and the hot plate and the transport belt A presser belt is provided straddling, and in a heating part formed by the presser belt and a hot plate, a single-faced corrugated cardboard and a liner are bonded by pressure and heated to form a corrugated cardboard.

Further, a corrugated board is cooled by a cooling part formed by a transport belt and a pressing belt.

In the case of manufacturing corrugated cardboard by the double facer, usually, a front liner is supplied to the lower side of a single-faced corrugated cardboard, and the two are joined by pressure.
If the moisture content of the back liner is lower than the moisture content of the front liner in the corrugated cardboard obtained by the joining, the lower liner having a low moisture content reduces the moisture such as steam when transferring the corrugated cardboard that is heated with moisture. Because of the large amount of absorption, the upper back liner causes greater elongation, and as shown in FIG. 5, the corrugated cardboard B has a warp in which the back liner a and the front liner c are bent upward (hereinafter, referred to as a convex warp). ) Occurs.

In order to prevent the above-mentioned convex warpage and make it flat or slightly curved downward, a shower device is provided on the transfer path of the back liner, and a convex warp is generated in the cardboard sent out from the double facer. In some cases, the shower device is operated to supply water to the back liner before it becomes the cardboard B in advance.

[0009]

Conventionally, a shower device is provided on the transfer path of the back liner on the upstream side of the single facer, or on the transfer path of single-faced cardboard between the heater device and the gluing device. Since a shower device is provided to supply moisture to the back liner, there are the following inconveniences.

That is, in the convex warpage prevention device provided with a shower device on the upstream side of the single facer, moisture is applied to the back liner immediately before being adhered to the center by the shower device. After the step forming on the heated step roll, when bonding the glued midsole and the back liner, it is not possible to obtain a temperature of the back liner suitable for bonding. For this reason, the back liner cannot be adhered well to the inner lining, and when the single-sided corrugated cardboard falls onto the sheet conveying conveyor to form a loop portion, the back liner may peel off. is there.

Further, since the back liner becomes wet and stiff when it contains water, the back liner may be wrinkled, flawed, or torn during running from the time when water is applied by the shower device to the time when the back liner is adhered firmly. There is a risk.

On the other hand, in a convex warpage prevention device provided with a shower device between a heater device and a gluing device, the traveling distance of a single-faced cardboard from the time when water is applied to the back liner to the time when it is bonded to the front liner. Is short, the applied water will be evenly dispersed and permeated into the back liner and the middle fiber paper, and will be bonded to the front liner with a double facer before penetrating. Since an appropriate bonding temperature cannot be obtained, there is a possibility that cardboard having poor bonding may be produced. In addition, the running speed of the back liner at the position where water is applied depends on the operating speed of the double facer, and the operating speed is different from the operating speed of the single facer. You cannot control the amount.

An object of the present invention is to solve the above problems,
It is possible to control the fountain of the shower apparatus according to the operating speed of the single facer, is that to be able to effectively prevent the convex warping of the corrugated board.

[0014]

In order to solve the above-mentioned problems, according to the present invention, a single-faced corrugated cardboard is provided at a discharge end of a pair of clamping conveyors which clamp a single-faced corrugated cardboard fed from a single facer and convey it upward. In a flat state while supporting its lower surface without reducing the traveling speed of
Substantially horizontally to transfer a guide means for discharging the sheet conveyor and is had a structure in which a shower device for injecting water in the width direction of the single-faced corrugated board adopts <br/> on its guide means.

As described above, when the guide means and the shower device which are substantially horizontal are provided at the discharge ends of the pair of sandwiching conveyors, the moving speed of the back liner at the position of the shower device is determined by the speed of the single faced cardboard in the single facer. Since the speed is substantially equal to the moving speed, the fountain amount of the shower device can be controlled according to the operating speed of the single facer.

Further, the single-sided cardboard is transported in a flat state by the guide means, and the shower device sprays water onto the back liner of the flat-sided cardboard in the flat state. As it can be provided, the traveling distance of the single-faced cardboard from the position of the shower device to the double facer can be sufficiently ensured, so that the moisture applied to the back liner is evenly distributed throughout the back liner and the inner lining. It can be dispersed and penetrated.

Further, the single-sided corrugated cardboard can be kept flat even immediately after the pair of holding conveyors come out, which is convenient for bonding the inner lining and the back liner.

[0018] Therefore, by heating the back liner with the double facer, it is possible to extremely effectively prevent convex warpage of the corrugated cardboard and obtain good adhesion, and the water supply position for the back liner is on the downstream side of the single facer. In addition, since the back liner is adhered to the middle line in a waist state, there is no inconvenience that the back liner is wrinkled or scratched, and high quality cardboard can be obtained.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIGS.

As shown in FIG. 1, on the floor, the second mill roll stand for supporting the first mill roll stand 1 which supports a roll R ₁ of the back liner a, the roll R ₂ of the corrugated medium b second and third mill roll stand 3 for supporting the roll body R ₃ table liner c are provided.

Between the first mill roll stand 1 and the second mill roll stand 2, a heater device 4 for adjusting the temperature of the back liner a and a single facer 5 for producing single-sided cardboard are provided.

The single facer 5 has a pair of upper and lower corrugating roll 5a, 5b, which is maintained at a high temperature, Shin b in drawn out from the roll body R ₂ of the second mill roll stand 2 of the pair The sheet is fed between the step rolls 5a and 5b to be step formed.

After the step forming, the center b is held on the outer periphery of the upper roll 5a and transported in the circumferential direction. At the time of the transport, the glue is applied to the step top by the gluing device 5c.

On the other hand, the back liner a pulled out from the roll body R _{1 of} the first mill roll stand 1 is heated by the heater device 4 to control the temperature. The back liner a after the temperature adjustment is fed between a pair of nip rolls 5d provided on one side upper portion of the single facer 5 and between an upper roll 5a and a pressurizing device 5e provided above the same.

Although an endless belt is shown here as the pressurizing device 5e, a press roller may be used. The back liner a is composed of the pressing device 5e and the upper roll 5a.
After being sent in between, this back liner a is adhered to the glued middle b after step molding, and the single-faced cardboard A is formed by the adhesion.

The single-faced cardboard A is conveyed obliquely upward while being clamped on both sides by a pair of clamping conveyors 6 and 7 provided above the other side of the single facer 5. At this time, the sandwiching conveyors 6 and 7 convey the single-faced cardboard A diagonally upward at a speed equal to or higher than the speed at which the single facer 5 forms the single-faced cardboard A.

As shown in FIG. 2, the upper clamping conveyor 6
The discharge end 6a extends downstream from the discharge end of the lower clamping conveyor 7, and is discharged by the discharge end 6a.
It is guided and discharged in a substantially horizontal state. The single-faced cardboard A is discharged with the back liner a facing upward.

At the discharge ends of the pair of clamping conveyors 6 and 7, a belt conveyor 8 is provided as guide means.
Belt conveyor 8, Ho pair of sandwiching conveyor 6,7
Receiving the single-sided cardboard A discharged in a horizontal state
It conveyed as it is, so that the feed on the feed end of the sheet conveyor 9 provided on the lower stream.

The belt conveyor 8 transfers the single-faced cardboard A at a speed equal to or slightly higher than the moving speed of the single-faced cardboard A conveyed by the pair of clamping conveyors 6 and 7. For this reason, the single-sided cardboard A is transported in a flat state, and a shower device 10 that uniformly sprays an appropriate amount of water over the entire width of the single-sided cardboard A is provided on the transport path.

In FIG. 1, the sheet transport conveyor 9
Is designed to convey the single-sided cardboard A at a lower speed than the pair of clamping conveyors 6 and 7, and due to the difference in speed, the single-sided cardboard A is bent into a loop shape, and many loops are formed and stored. Is transported downstream.

On the downstream side of the sheet conveying conveyor 9, a heater device 11 and a gluing device 12 are sequentially provided.
The heater device 11 has three heater rolls 11a, 11b,
The single-sided corrugated cardboard A having the sheet conveying conveyor 9 is guided by the heater roll 11b and preheated. The glue is applied to the top of the single-faced cardboard A after preheating by the gluing device 12.

On the other hand, the front liner c drawn from the roll body R _{3 of} the third mill roll stand 3 is guided by the heater roll 11 c of the heater device 11 and is preheated. The pre-heated front liner c and the single-faced cardboard A preheated and glued to the top of the step are fed into the double facer 13.

Although the double facer 13 is not shown in detail in the drawing, it has a heating part and a cooling part as in the case of the conventionally known double facer. Are pressure-bonded and heated to form a corrugated cardboard B. The cardboard B is cooled by a cooling part following the heating part.

The corrugated cardboard A discharged from the double facer 13 is cut on both sides by a trimming rotary blade, slit in the longitudinal direction as required by a slitter, and then cut by a cutting device to a predetermined length. The cardboard sheet is cut into pieces.

Here, when the back liner a has a lower moisture content than the front liner c, when the double facer 13 forms the corrugated cardboard B, high heat is applied in the heating part. Part of the moisture contained in the glue becomes water vapor, and the back liner containing less water absorbs more water from this water vapor, so that the fibers of the back liner a have larger elongation and are discharged from the double facer 13 The corrugated cardboard B thus bent upwards as shown in FIG. 5, and a convex warpage occurs.

In order to prevent the convex warpage and make it flat or slightly curved downward, water is sprayed from the shower device 10 shown in FIG. . The amount of water supply is adjusted according to the state of warpage.

Here, the shower device 10 is provided on a belt conveyor 8, and the belt conveyor 8 separates the single-faced corrugated cardboard A sent from the pair of clamping conveyors 6 and 7 into an adhesive between the back liner a and the center b. In order to convey the water on the downstream sheet conveying conveyor 9 in a flat state without forming a loop at the initial stage, water is sprayed from the shower device 10 to uniformly distribute water over the entire back liner a of the single-faced cardboard A. It can be supplied and good adhesion between the back liner a and the midline b can be obtained.

Further, since the belt conveyor 8 is provided at a position close to the single facer 5 for producing the single-faced cardboard A, the traveling speed of the single-faced cardboard A conveyed by the belt conveyor 8 is a single facer. 5
Of the step rolls 5a and 5b.

For this reason, it is possible to control the amount of fountain of the shower device 10 in accordance with the operating speed of the single facer 5, which is optimal for preventing a convex warpage of the back liner a of the single-faced cardboard A. An amount of water can be applied.

Further, the single-sided corrugated cardboard A to which water has been added by the shower device 10 forms a loop portion on the sheet conveying conveyor 9 and is stored. The sheet conveying conveyor 9 passes through the heater device 11 and the sizing device 12. Since the water is sent to the double facer 13, it takes time to arrive at the double facer 13, during which time the water applied to the back liner a permeates the back liner a and the shin b. Therefore, moisture can be uniformly contained throughout the single-faced cardboard A, and the double facer 1
In step 3, good adhesion between the single-faced cardboard A and the front liner c is obtained, and the convex warpage of the cardboard B can be prevented very effectively.

In the embodiment shown in FIG. 2, a belt conveyor 8 is provided below the shower device 10 to transfer the single-faced cardboard A in a flat state. However, the belt conveyor 8 is omitted, and FIG. As shown in the figure, a horizontal discharge portion 14 may be provided at the discharge end of the lower holding belt 7.

Further, as shown in FIG.
Is provided with a downward slope toward the downstream side so that its discharge end is located above the sheet conveying conveyor 9, and a single-sided cardboard A is provided along the upper surface of the guide member 15.
May be slid. Here, the guide member 15
For example, one wide guide plate, a plurality of narrow guide plates provided in parallel, or a plurality of guide bars provided in parallel can be adopted.

Although not shown in the drawing, a roller conveyor may be provided instead of the belt conveyor 8.

That is, the guide means is a single-sided cardboard A
As long as the discharge end is located above the sheet conveying conveyor 9.

[0045]

As described above, according to the present invention, the guide means for transferring the single-faced cardboard fed from the pair of holding conveyors in a substantially horizontal state is provided downstream of the pair of holding conveyors. Since the shower device is provided above, the following effects can be obtained.

Since the traveling speed of the single-faced cardboard at the water injection position of the shower device is substantially equal to the speed of the single facer, the water injection amount of the shower device can be controlled by the operation speed of the single facer.
In addition, since water can be uniformly applied to the entire back liner of a single-faced cardboard, convex warpage of the cardboard can be prevented very effectively.

Since the back liner is not provided with moisture for preventing convex warpage on the upstream side of the single facer, a temperature suitable for bonding to the center line is obtained, and wrinkles, scratches, There is no risk of breakage, and a good cardboard can be obtained.

Since the traveling distance of the single-sided cardboard from the time when moisture is applied to the back liner to the time when it is adhered to the front liner is long, the applied water is easily dispersed and permeated uniformly into the back liner and the paper fiber of the middle liner. Therefore, there is no possibility that the adhesive suitability temperature cannot be partially obtained due to the non-uniform water content of the single-sided cardboard, and a cardboard with good adhesion can be obtained.

Since the single-faced cardboard sent out from the pair of sandwiching conveyors can be temporarily held in a flat state by the guide means without being formed into a loop at the initial stage of bonding the back liner to the center liner, the back liner can be used. And the adhesive strength between the core and the core are improved .

[Brief description of the drawings]

FIG. 1 is a schematic diagram of a corrugator embodying a convex warpage prevention device according to the present invention.

FIG. 2 is an enlarged front view of a guide unit according to the first embodiment;

FIG. 3 is a front view showing another example of the guide means according to the first embodiment;

FIG. 4 is a front view showing still another example of the guide means according to the first embodiment;

FIG. 5 is a perspective view of a corrugated cardboard bent upward and convexly.

[Explanation of symbols]

 Reference Signs List 5 Single facer 6, 7 Nipping conveyor 8 Belt conveyor 9 Sheet transport conveyor 10 Shower device 12 Gluing device 13 Double facer 15 Guide plate

──────────────────────────────────────────────────続 き Continuation of front page (56) References JP-A-9-85859 (JP, A) JP-A-58-177341 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) B31F 1/00-7/02

Claims (2)

(57) [Claims] 1. A sheet conveying conveyor which conveys single-sided cardboard at a lower speed than a pair of pinching conveyors which conveys a single-faced cardboard fed from a single facer and conveys the sheet upward. with glue by gluing device flute tips of Shin in the single-faced corrugated board to be discharged from the conveyor, Oite a single face corrugated and liner after the glue to Koruge data you Riawase so that stuck is conveyed to the double facer, the discharge end of said pair of holding conveyor, its without a single face corrugated fed from the pair of holding the conveyor, to lower the running speed
Guide means for transferring the sheet substantially horizontally in a flat state while supporting the lower surface and discharging the sheet onto a sheet conveying conveyor is provided, and a shower device for spraying water in the width direction of the single-sided cardboard is provided on the guide means. Koruge data to. Wherein said guide means, Koruge data according to claim 1 consisting in a sandwich conveyor the same speed or faster speed from the belt conveyor to transport the single-faced corrugated board.