DE7321705U - EQUIPMENT FOR THE CONTINUOUS PRODUCTION OF CHIPBOARD - Google Patents

Description

our reference: 73/12 Hannover, the Ί. June 1973

338 by / to

Device for the continuous production of chipboard

The invention relates to a pressing device for the continuous production of chipboard, fiberboard or the like with a specific weight uniform over the entire width and with the same thickness, consisting of one over several rollers and partially guided around a heated, continuously rotating press drum, under tension standing endless steel belt, over which in front of the heated one Press drum horizontally extending part a spreading device is arranged, wherein the on the pressure rollers guided, tensioned endless steel belt scattered material structure is pressed between this and the heated press drum to form a sheet of panels.

In the pressing device made known by DT-OS 2 050 325 it is necessary that the pressure rollers generate a linear pressure of about 400 kg / cm and more, whereby the continuously rotating press drum, but also the pressure rollers in the press area deform like a bump «. These Deformation phenomena are eliminated again outside of the pressing area because the jacket of the process drum or the pressure roller zone due to elastic stress compensation springs back to its original position, but you get a slab track, the edge boroicho are thinner

7321705 12/15/77

OO 0 0

as her middle section, “The reason for this lies in this resulting from the indentation gap between the press drum and the pressure rollers, which is in the area of the press drum and roller bottoms is significantly lower than between the under the action of the linear pressing forces according to " giving jackets of the press drum and pressure rollers.

The invention is based on the object of a continuously operating press device with the aforementioned features to be further developed in such a way that one in thickness and weight evenly pressed slab sheet produced economically can be.

This object is achieved according to the invention in that at least some of the bump-like deformed in the pressing area Press drum associated, adjustable rollers has a convex-ground surface over its width. The degree for the convex clad cut depends on the bump-like one Deformation of the press drum shell and the intrinsic roll deflection in the event of a load, taking into account the modulus of elasticity of the material used. Through the use of rollers with convex-ground surfaces achieved that the temporarily thinner shaped at its edges plate web at the end of the finishing press area over its entire Width is equal in thickness and weight.

It makes sense to make the press drum and pressure roller casing larger in order to counteract the buckling indicated. However, this would reduce the material and manufacturing costs for the press drum and the pressure rollers in one Increase to an unacceptable level. In addition, the heat would be transferred from the, for example, by means of water vapor heated press drum significantly reduced by their jacket to the Matorialbahn to be pressed. The same is true with regard to the heatable pressure roller.

■ 7321705 12/15/77

Further features of the invention are based on schematic Drawings that show only one embodiment of the invention, explained in more detail. Show it:

Figure 1 shows a plant for continuous production

of thin chipboard in a side view,

FIG. 2 shows a cross section along the line H-II in FIG. 1 through the heating drum and a pressure roller ,

Figure 3 shows a cross section along the line HI-III through the heating drum,

FIG. H shows a cross section along the line IV-IV through the heating drum and a curved, ground calibration roller.

The material to be pressed is, after it has been prepared with appropriate binding agents, through the spreading device 9 sprinkled at the point 12 on an endless belt 10 in a certain structure. This scattered Structure 13 is through the endless conveyor belt 10 in the Gap between the infeed roller 8 and the heated, rotating drum 1 is highly compressed.

In the gap between the pressure roller 5i the same time serves as a deflection roller for the endless steel belt 10, a renewed compression of the chip fleece takes place. The coat of the Infeed roller 8 and in particular the heated pi-eating drum 1 and the pressure roller 5 is deformed inwardly like a bump.

The boule-like coating of the press drum 1, the pressure

7321705 15.1177

Roller 3 and the inlet roller 8 are marked with Ib, Jb and 8b. Dfinnch is the compressed material web through the Kallbr-U <r rollers 2 and 3 calibrated «

The rollers k to 7 serve as revolving rollers for the endless steel belt 10. The tray 1 is heated in order to wrap the endless belt, which is placed under tension by the roller 6, around the drum 1 between the endless belt 10 and the drum 1 Drum 1 located material layer to prepress into a web.

Due to the bump-like deformation Ib, 5b and 8b of the shell of the drum 1 and the pressure rollers 5 and 8, caused by the pressing of the pressure rollers. 5 and 8, a chipboard sheet is obtained, as is indicated in FIG. 3 with the reference number lh .

Proper pre-pressing of the web of material is only guaranteed if, at the same time as the pressure exerted by the pressure rollers and generated by the endless, tensioned belt 10, also a sufficient temperature is present for the purpose of curing the binder.

The calibrating rollers 2 and 3 are corresponding to the bump-like Deformation of the heated press drum 1 and the pressure rollers 5 and 8 ground arched so that the middle The area of the sheet is subsequently compressed to the same extent as the two hand zones. This gives you a Slab membrane of uniform thickness over its entire width.

In Figure 1 and Figure 4 is the curvature of the calibrating rollers you.--!' the reference numerals 2a and 3a have been indicated.

The purpose of determining the dimension for the v / o bung 2a of the quay

7321705 12/15/77

- 3

Brlerwalze 2 is the thickness of the plate web, even this the gap between the roller 5 and the drum 1 happened hot, measured · According to these measurement results, the one exact reproduction of the bulge-like deformation Ib and 5b of the Heating drum 1 and the pressure roller 5 is then reproduced the curvature of the calibration rollers 2 and 3 ground.

Of course, when designing the calibrating rollers 2 and 3 take account of the inherent deflection of these rollers However, due to the known modulus of elasticity of the material from which these rolls are made, no Problem.

FIG. 4 shows the calibrating roller 2 in the working position, that is to say that the central area of the plate web, which is identified by 1Λ in FIG. 3, still has a curvature. In Figure k , however, the curvature has already been eliminated, so a uniformly thick material web 15 is obtained.

Due to the arrangement of the curved, ground calibration rollers it is also achieved that the chipboard sheet produced is completely uniform over its entire width specific weight and thus a completely uniform strength.

The finished web 16 emerging from the system is fed to a further processing machine.

In a practical example of a plant for continuous Hex'position of chipboard with a thickness of 1.6 to 10 mm, the drum 1 has a diameter of 3,000 mm, the pressure roller 5 and the deflection rollers 4, 6, 7 and 8 have a diameter of 1,400 mm. The endless belt 10 has a length of approx. 43 m and the drum and the rollers are in stands

7321705 12/15/77

stored, which have a height of 3 »300 mm. The calibration rollers have a diameter of 800 mm · the width of the work piece the system is 2,100 mm *

The jacket of the heated drum 1 is 50 mm thick and the Shell of the pressure roller 5 30 mm. The indentation Ib of the drum shell was 1.2 mm and the Andrüokwel & enmantels 0.4 mm. By means of a suitably ground calibration roller 2, a perfect one was uniformly thick over its entire width Chip pike web preserved.

Optionally, the calibration process can also be carried out partly by the calibration roller 2 and partly by the calibration roller 3 be performed·

There is also the option of setting different Distances between the calibrating rollers and the drum 1 also different to calibrate thick chipboard webs, by the calibration work of these two calibration rollers 2 and 3 combined accordingly.

In addition, alternatively or also alone, the convex grinding of the jacket of the pressure roller 5 and / or 8 can reduce or even eliminate the deformation of the chipboard web, as indicated by lk in FIG. For this purpose, an exact determination of the extent of the bump-like deformation of the drum 1 and the inherent deflection of the pressure rollers 5 and 8 is required, which can be determined by calculations or also by experiments.

On the basis of the results obtained in this way, the pressure roller 5 and / or 8 is then provided with a convex cut of the jacket Mistake.

7321705 15.1177

Bs lies in the peace of the invention, the number in particular of the convex-ground rollers to increase or decrease t

- PATENT CLAIMS -

7321705 12/15/77

Claims (6)

P T CLAIMS csBBaaasssasaaasaaBaasaaaaaeaaasaaa Device for the continuous production of chipboard, fiberboard or the like with one over the entire Width uniform specific weight and with the same thickness, consisting of one over several rollers and partially under tension guided around a heated, continuously revolving press drum Endless steel belt with a spreading device over its part, which runs horizontally in front of the heated Preßtromniel is arranged, the material structure being sprinkled onto the tensioned endless steel belt guided by pressure rollers is pressed between this and the heated press drum to form a slab sheet, characterized, that at least a part of the rollers assigned to the press drum, which is preformed in the form of a bulge in the press area its width has a convex-ground surface and the dimension for the convex cladding as a function the bump-like degree of deformation of the press drum shell and the roll's intrinsic deflection under load, taking into account the modulus of elasticity of the used material can be determined. 2. Device according to claim * , 7321705 12/15/77 ¹ · · · I It characterized, that a flat, open, accessible inlet roller ({') and a flat-ground, adjustable pressure roller (5) the convex-ground, adjustable calibration rollers (2, 3) are upstream. 3. Device according to claim 1, characterized in that that the engageable nip roller (5) and diu anf ⁺ 9llbare calibrating roll (2) have convex-ground coat surfaces, while the engagable inlet roller (8) and the engagable calibrating roll (3) are ground flat. 4. Device according to claim 1, characterized in that that the adjustable inlet fleece (8) and the adjustable Calibrating roller (2) are ground flat, while the adjustable pressure roller (5) and the adjustable calibration roller (3) convex-ground jacket surfaces exhibit. 5. Device according to claim 1, marked by the combination of a flat, adjustable 7321705 15.1177 "'« · «· IC Il tit «I f, t C <- * let- ,; Pressure roller, (5) and a flat-ground, adjustable one Kalibi-ierwalae (2) with a convex-ground, adjustable infeed roller (8) and a convex-ground, adjustable calibration roller (3) 6. Device according to claim 1, marked by the combination of a flat, adjustable Pressure roller (5) and a flat-ground, adjustable calibration roller (3) with a convex-ground, adjustable infeed roller (8) and a convex-ground, adjustable calibration roller (2). 7 · Device according to claim I ₁ marked by a convex-ground, adjustable calibration roller (2) in connection with flat-ground, adjustable rollers (3, 5 »8). 7321705 12/15/77