JP2724894B2 - Single-sided corrugated cardboard manufacturing equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to one or a plurality of stepless papers (liners) and a plurality of stepped (grooved) sheets adhered thereto and bonded to each other. The present invention relates to a method for forming a sandwich structure made of paper (intermediate paper).

Australian Patent Application No. 62323/86 describes an improved cardboard manufacturing wherein two layers of stepped middle paper (grooved paper) are adhered to each other at the top of each step (stepped top) and sandwiched by two outer liners. Discloses the law. This application 62323/86,
It is hereby incorporated by reference.

Australian Patent Application No. 62323/86 also discloses a structural paper in which two layers of individual core paper are corrugated and contacted step by step on a plurality of synchronously operated stepping rollers. A method of forming is disclosed.

U.S. Pat. No. 3,700,518 discloses a method of forming corrugated board having two outer liners and two inner stepped sheets glued together at the top of the groove. The method adopted here is to step two sheets of middle paper together and bond a liner to each to obtain two single-sided cardboard boxes, which are glued together at the top of the groove. This method has the disadvantage that the tops of the grooves cannot be glued accurately.

Australian Patent Application No. 11926/88 addresses the issue of initial cost of building a new corrugating machine for making corrugated cardboard tops. The specification of Australian Patent Application No. 11926/88 focuses on a device that can modify a current corrugating machine to create corrugated cardboard with the same top as corrugated cardboard as with conventional corrugated paper. doing.

Conventional machines for producing corrugated board are provided with devices for making single-sided corrugated board in which a liner is adhered to a single piece of corrugated sheet. To form a more complex cardboard structure, the exposed groove may be glued to another liner and, if necessary, to another single-sided cardboard.

"Single-sided corrugated board making machine" usually includes the following as its basic components.

(A) a roll stand for liner and stepped inner paper; (b) a pair of stepping rollers for stepping the inner paper into stepped paper; (c) a pair of heated smooth surfaces for liner paper ( Without steps)
(D) a stepless pressure roller for forming a single-sided cardboard by bringing a liner into contact with a second stepping roller; and (e) an idler roller for guiding the formed single-sided cardboard to the next processing portion.

In a conventional single-sided cardboard, a predetermined pressure is applied to ensure the adhesion between the liner and the stepped inner paper. When pressure is applied in this manner, a pressure line is generated at a portion corresponding to the top of the liner surface. Further, since it is necessary to apply pressure, the strength of the single-sided cardboard structure may be negatively affected, or the appearance and printability of the cardboard may be impaired.

SUMMARY OF THE INVENTION An object of the present invention is to provide a novel single-faced corrugated cardboard manufacturing apparatus for producing an improved corrugated cardboard in which two sheets of corrugated middle paper are accurately adhered to each other at the top of the corrugated sheet and adhered to a liner.

According to the present invention, the following single-sided cardboard manufacturing apparatus is provided. That is, (a) a grooved support roller for supporting the first stepped middle paper is provided, and (b) the first middle paper is stepped by engaging with the grooved support roller. A single stepping roller formed, comprising a single stepping roller having a smaller diameter than the support roller, forming a single stepping sheet. And (c) a pair of stepping rollers for stepping the second inner sheet to form a second stepped inner sheet, wherein: A pair of stepped rollers having a smaller diameter than a roller, wherein the formed second stepped intermediate sheet and the first stepped intermediate sheet fed along the support roller have a step top; One of the pair of step rollers is disposed adjacent to the support roller so as to contact each other at the step top; A) a first stepping roller disposed between the single stepping roller and the pair of stepping rollers, for applying an adhesive to the second stepping sheet or the first stepping sheet; An application unit that, when the second stepped sheet is brought into contact with the first stepped sheet being transported along the support roller, adheres to the first stepped sheet; So that the first
(E) on the top of the second stepped middle paper while the adhesive of the first and second stepped middle papers is being sent along the support roller. A second application section for applying the adhesive from the outside, and (f) the first and second stepped portions which are being transferred by the grooved support rollers downstream of the second application section. A liner adhering means for adhering a liner to the adhesive of the inner paper; The diameter of the grooved support roller is selected and the pair of stepped rollers are disposed so that the first and second stepped inner sheets of adhesive are fed along the grooved support roller. A single-sided corrugated cardboard manufacturing apparatus is provided.

The support roller is involved in any operation of the device and is a key component in ensuring product retention and accurate positional relationship between the inner sheets. It is desirable to use a support roller that is larger in diameter than the other three step rollers.

The single step roller is positioned exactly against the groove of the support roller and is configured to be pressed by the support roller to form a first stepped inner sheet. The first stepped inner sheet is held in the premises of the support roller. The holding in the groove is desirably performed by reducing the pressure from inside the support roller using a vacuum (negative pressure). The negative pressure may be introduced into the groove on the surface of the support roller from outside the support roller. Alternatively, a positive external pressure may be applied from the outside to press the inner sheet against the support roller. It is also preferable that the support roller has an appropriate camber on its surface in the axial direction at the contact point between the step roller and the support roller. Camber adjustment is known in the paper industry.

The second stepped inner sheet is generally stepped by a pair of stepping rollers, one of which is pressed against the other. The inner roller of the pair of stepping rollers has an accurate positional relationship with the groove of the support roller, so that the first and second inner sheets come into accurate contact with each other at the tops. The pair of step rollers are pressed together by the support roller, and the step tops of the grooves are pressed together.

The support roller surface may be provided with an adjustment camber in the axial direction at the point of contact between the inner step roller and the support roller.

It is not necessary that both stepped inserts have the same pitch, as long as the tops of each insert can be aligned with each other by a sufficient number. For example, according to the apparatus of the present invention, there is provided a stepped structural panel including one sheet of smooth paper and first and second stepped inner sheets, wherein the first stepped inner sheet is adhered to the smooth sheet. The second stepped middle paper has a higher step (groove) height than the first middle paper, but has a smaller number of grooves per meter,
It can also be used to create a stepped structural panel having a configuration in which the top of the groove of the second middle paper is bonded to every other top of the first middle paper. In this case, one of the inner sheets is
It is preferable to have half the number of grooves per meter and to have a step (groove) twice as high as the other inner paper.

It is desirable that the conventional heated, S-wrapped liner applicator and drive roller be arranged such that the liner can be approached tangentially prior to bonding to the inner bond. Preferably, the liner moves on an adjustable preheating drum before adjusting the tension with the S-winding roller.

It is desirable to perform substantially the same processing on each of the inner sheets prior to the stepping. Devices for this include tension control devices, preheating / preliminary conditioning devices, heated S winding rollers, steam box conditioning devices, and the like.

By improving the strength characteristics of the double middle paper corrugated top-corrugated structure, a lighter corrugated cardboard can be manufactured with the same strength as compared with the conventional structure. The use of a step-top bonding structure allows for a saving in material costs.

In addition, it has been found that a cardboard box having a step-top-top bonding structure exhibits excellent durability and strength. The characteristics of the folding of the corrugated cardboard of the corrugated top-corrugated top structure,
The corners and creases of the box add further strength to the structure. The step-to-step adhesive structure can be folded tightly, forming a hinge-like seam, and is superior in strength, flexibility, and appearance as compared with conventional cardboard folds.

The bonded stepped middle paper according to the present invention (middle paper bonded body)
It is then glued to a suitable liner to form a lightweight laminated structure. The inner paper may be formed of 100% cellulose fiber, lignocellulose fiber or a combination of cellulose, lignocellulose and synthetic fiber, or may have a laminated structure.

The liner or sheet member can be formed of various materials of various thicknesses, including cellulose fibers, lignocellulosic fibers, hybrids of cellulose and lignocellulose and / or synthetic fibers, natural or synthetic polymers, wood,
A metal, a plate-like material having an adhesive layer obtained by combining these materials, and the like can be used, but the present invention is not limited thereto. Strips or strings or the like of a suitable material may be interspersed between the inner sheets of paper and adhered together with the step-to-step junction. By mixing the strips and the strings in this manner, the bonded middle paper is reinforced, the step-top bonding structure is prevented from spreading until the liner is further attached, and the strength can be added to the cardboard.

The bonding can be performed by an adhesive or a method such as soldering, brazing, welding, or the like, but is not limited thereto.

If lightweight structural panels are required for architectural purposes, such as for use in ceiling panels or furniture, wooden plywood can be used for the liner. For other applications such as airframe skins for aircraft, the liner may be a metal foil or a synthetic polymer.

If this type of machine is introduced into the conventional stepping process, it is not necessary to apply pressure to ensure the adhesion between the liner and the stepped sheet. Such innovations according to the present invention not only make full use of the conventional process but also avoid negatively affecting the strength of the cardboard and avoiding the appearance of pressure lines and impairing the appearance of the cardboard.

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic view of a conventional single-sided corrugated cardboard manufacturing apparatus, FIG. 2 is a schematic view of an apparatus of the present invention for forming a corrugated top bonding structure, and FIG. 3 is a detailed view of FIG. FIG. 4 shows a modified version of the apparatus of FIG. 2 according to the invention for producing a conventional single-sided cardboard.

To understand the present invention, a conventional single-sided cardboard manufacturing apparatus will be described first. In FIG. 1 showing a schematic diagram of a conventional single-sided corrugated board manufacturing apparatus,
It has a roll stand 5 for liner thick paper, a preheating roller 6, a single-sided production section 7, and a roll stand 8 for middle paper. The one-sided production unit 7 includes stepping rollers 10 and 11, an adhesive applicator 12, and a pressure roller 13 that presses the liner against a stepped intermediate sheet 23 on the roller 11. Liner cardboard 21 is preheated roller 6 from stand 5
Through the heated smooth surface guide rollers 15, 14. The formed single-sided cardboard 24 is sent to the idler roller 16, further sent to the conveyor 17, and sent out to the next processing step.

An apparatus for forming a corrugated cardboard by adhering two corrugated middle sheets together at the top according to the present invention is shown in FIGS. 2 and 3. FIG.

The two inner sheets 22 and 23 sent from the rear stands 5 and 8 are adjusted in advance by the preliminary adjusters 42 and 45. The driven S winding rollers 15 and 55 feed the inner sheet to the stepping nip. Before the middle sheet enters the stepping nip, the steam boxes 51, 52, 53, 54 further prepare the middle sheet.

Guide rollers 31, 32, 43, 44, 46, 47 are arranged to receive the liner and the fill from each element of the apparatus and guide them to the other.

The first inner sheet 23 is provided with a groove (step) between the step roller 10 and the support roller 36. These rollers are cut in the same groove shape as the step rollers 34, 35, or in a groove shape of 1/2 or 2 times the pitch. The support roller of this embodiment has a diameter
It is set at 900 mm and the diameter of the step roller is set at 300 mm.

The inner sheet 23 is pulled inward of the radius of the support roller 36 by a negative pressure from the inside of the support roller, and is held in the groove of the support roller 36. The surface of the support roller 36 is configured such that positive pressure is applied radially outward in the regions 49 and 50.
Due to this positive pressure, the stepped middle paper in the area 50, the area 49
The top-to-top junction of the middle paper bulges radially outward. With this configuration, the adhesive from the adhesive application sections 37 and 12 is successfully fed to the exposed top of the groove of the stepped inner sheet.

Instead of applying a negative pressure, a guide or finger structure may be used to hold the first middle paper and the top-to-top joint of the middle paper to the support roller. Applying a negative pressure to the groove of the support roller from outside or applying a positive pressure to the inner paper,
The inner sheet may be held in the groove of the support roller.

The adhesive application section 12 is disposed downstream of the step roller 10 and applies the adhesive to the top of the first inner sheet 23.

 The inner sheet 22 is set between the setting rollers 34 and 35.

A positive radius outward positive pressure is applied to the stepping roller 35 at the discharge point of the stepping sheet 22 to help release the stepping sheet 22 from the stepping roller 35, and It assists the step-top bonding between the paper 22 and the stepped inner sheet 23.

The stepping roller 35 may be provided with a negative pressure device for holding a stepped sheet in its groove. A guide or a finger may be provided so as to position the second stepped sheet when the second stepped sheet comes into contact with the first stepped sheet on the support roller.

The S-winding roller 38 guides the liner 21 downstream of the preheater 6 and joins with the top-to-top junction of the inner sheet, and the two-layer stepped inner sheet is adhered to each other at the top. To form a single-sided cardboard with a liner adhered to the core.

After the adhesive is applied to the liner 21, radiation or convection heat,
The application of energy by a microwave oven or other device 39 assists in bonding the liner 21 with the top-to-top adhesive of the inner sheet.

All components may be pre-heated, humidified or pre-treated in advance to accelerate bonding at the inter-element boundaries.

Product discharge is aided by applying positive air pressure from the flow box 40 inside the support rollers 36 or applying negative pressure from the liner side. The combination 25 of the liner and the step-top adhesive of the inner paper is transferred to the next processing unit via the transfer unit 41.

The transport section 41 may be linear or curved. In the case of the curved section, the pressure is applied to the adhesive by utilizing the tension of the liner. Changing the radius would be more advantageous for adhesive spreading.

An automatic splicer may be used for each of the inner sheets coming from the roll stands 5 and 8 and the liner coming from the roll stand 4.

As shown in FIG. 4, the deforming apparatus of the present invention can produce an improved version of a conventional single-faced cardboard.

In FIG. 4, the feeding of the stepped sheet 22 to the step rollers 34 and 35 is stopped, the application of the adhesive in the application section 12 is stopped, and the application section 37 adheres to the stepped sheet 23. Continue applying agent. In this case, the applicator 37 is moved toward the support roller 36 and comes into contact with a thin conventional stepped sheet.

FIG. 5 shows another embodiment in which the diameters of the supporting roller and the step roller are equal, for example, 460 mm or 600 mm. The first inner paper 61 passes through the steam box 68 and the step rollers 64.
And are stepped by engaging the step rollers 64 and 65. Stepped inner paper 61 is rolled by positive pressure
It is detached from 64 and held on the surface of the roller 65. The adhesive is applied in the application unit 70. The second inner sheet 62 passes through the steam box 69 and is drawn between the step rollers 66 and 67. The stepped sheet 62 is held by the rollers 67 until the top of the stepped sheet 62 comes into contact with the step top of the stepped sheet 61. The stepped inner sheet 62 is removed from the roller 67 by positive pressure, and the mutually adhered inner sheet is the roller 65.
Is held. The adhesive is applied to the top of the outer surface at the application section 72, and then the liner 63 is adhered to the stepped paper with the help of the energy application device 74. Heating protection member 71
However, the coating portions 70 and 72 are protected from heat generated by the rollers 64 and 67 which are heating rollers.

As is clear from the above, a cardboard having a core bonded to each other can be manufactured by modifying a conventional device.

In addition, by using non-pressurized bonding, a product having a good appearance can be manufactured as compared with a conventional cardboard manufacturing apparatus.

 ────────────────────────────────────────────────── ─── Continued on the front page (56) References French Patent Publication 393156 (FR, A) West German Publication 901255 (DE, A)

Claims (3)

(57) [Claims] 1. A single-faced corrugated cardboard manufacturing apparatus capable of forming a corrugated cardboard having two corrugated corrugated sheets adhered to each other at a corrugated crest, comprising: (a) a first corrugated corrugated paper sheet; A grooved support roller for supporting; (b) a step of engaging the grooved support roller to step on the first inner sheet to form the first stepped inner sheet; A stepping roller comprising a single stepping roller having a diameter less than or equal to the diameter of the support roller, wherein the formed first stepping sheet is formed along a portion of the periphery of the support roller. (C) a pair of stepping rollers for stepping the second inner sheet to form a second stepped inner sheet, wherein the pair of steps have a diameter equal to or less than the diameter of the support roller. A second stepped intermediate sheet formed with a setting roller; and the first stepped sheet being fed along the support roller. One of the pair of step rollers is disposed adjacent to the support roller so that the paper is in contact with the step top and the step top, and (d) the single step roller and the pair of step rollers A first application unit that is disposed between the second stepping roller and the second stepping sheet or applies the adhesive to the first stepping sheet; When paper is brought into contact with the first stepping paper being transported along the support rollers,
A first application unit that is adhered to the first stepped inner sheet so as to be an adhesive body of the first and second stepped inner sheets; and (e) the first and second stepped sheets. While the adhesive body of the stepped middle paper is being sent along the support roller, the second
A second application section for applying an adhesive from the outside to the top of the step when viewed from the outside of the stepped middle paper, and (f) downstream of the second application section by the grooved support roller A liner is attached to the adhesive body of the first and second stepped inner sheets during transfer,
(G) the adhesive of the first and second stepped inner sheets is fed along the grooved support roller for a time sufficient for the adhesive to cure. A single-sided corrugated cardboard manufacturing apparatus, wherein the diameter of the grooved support roller is selected and the pair of stepped rollers is provided. 2. A single-faced corrugated cardboard manufacturing apparatus according to claim 1, wherein an adhesive between the liner and the first and second stepped inner sheets is provided downstream of the liner sticking means. A single-sided corrugated cardboard manufacturing device provided with an energy generator for accelerating curing. 3. The single-faced cardboard manufacturing apparatus according to claim 1, wherein the support roller is provided with a camber adjusting device.