DE2247990A1 - Continuous chipboard sheeting - with variable gap for alternating high-frequ-enzymatic treatment between initial and main presses - Google Patents

Abstract

Designed to process a blanked contg a heat-activated bonding agent, the alternating high-frequency field is located in the gap between an initial press and the main press to apply head and press. to the material. The initial roller of the main press. can be located at will to vary the gap between the 2 presses, to ensure that the bonding action is consistent for all thickness of sheeting to be developed.

Description

Device for the continuous production of chipboard (addendum to the patent ... (P 21 13 763.3-15)) In the main patent a device for continuous Manufacture of chipboard from one by Rontaktnsärme and high frequency energy Inflatable fleece described, its particles with thermosetting binders are offset. This device consisted of a fleece carrier, one above it arranged forming station for the formation of the chip fleece, a heatable, continuously working press, behind which several high-frequency echselfeldr Serving means were provided, these means in front of and between the pressure forces calibrating rollers exercising should be arranged. It was also stated that the first pair of calibrating rollers replaced by a continuously operating press Could be that a longer pending pressure and possibly additional Exerts heat on the continuous chip cake that has been pretreated with a frequency of one hole.

This enables the chip cake to be heated up Distribute high frequency energy to multiple points to keep the temperature inside of the panels to be produced then slowly increase.

Of course, the binder is to be composed so that it not already when applying the contact heat or at home Apply the first applied high-frequency energy hardens completely.

It has now been found that the quality of such a device produced panel is adversely affected when changing conditions exist, for example, if the thickness of the plate to be produced is changed, what -um to meet customer requirements - can be the case several times a day. These Reduction in quality is probably due to the fact that the process and the Effect of technological influence within the heated press (Pre-press) leaving chip fleece until it enters the downstream one Calibration device is different in time, so that not with certainty of best time for the binding agent to set during the calibration process is achieved. However, this is necessary for a permanent strength of the plate.

It would make sense to place the nonwoven in the heatable press and on the To expose the way to the calibration device to variable temperatures. It has however, it has been shown that this - presumably as a result of temperature-independent influences - does not lead to a satisfactory result.

If now, according to the invention it is ensured that the distance between the heatable press and the first downstream of this press, pressure forces exercising means, a pair of calibration rollers or a second continuously working press changed, then the aforementioned disadvantages no longer occur on, a deterioration in the properties of the panel sheet produced then avoided.

The compressive forces acting on the heated sheet material can be slidably arranged in their entirety, but it is also possible for example the first pressure forces arranged behind the heatable press executive agents removable or removable to arrange to change the mentioned distance.

The invention is shown schematically on the basis of one in the drawing Embodiment explained below.

A fleece carrier 1, such as an endless belt or the like, is over deflecting rollers 2 and 3 driven. In the front area, i.e.

near the roller 2 is a Fonastation above the fleece backing 4 arranged, to which a chip mixture 5 is fed.

The mixture of chips is applied to the fleece using the wind sifting method.

carrier 1 scattered. Of course, the forming station can also have a different structure. The scattered fleece6 then runs through a prepress 7, which is formed from two endless chain belts or the like 8 and 9, each of which is provided with pressure rollers 10 and 11 are assigned. The first device 12 is arranged behind the prepress 7, which generates a high-frequency alternating field. This is followed by a first pair of calibrating rollers 13, another device 14 generating an alternating field, a second pair of calibrating rollers 15, a third device for generating a high-frequency alternating field 16 and further calibration rod pairs 17 which are unheated or even cooled could be. The individual calibration rollers of the roller pairs are included in each an endless steel belt 18 or 19. These endless. Ribbons can be omitted entirely or just to groups of sizing rollers, for example, subdivided around the heated ones and unheated or cooled rollers.

Instead of the first calibration rollers 13, one with two press belts can also be used equipped press can be used (similar to pre-press 7), which take a longer pending pressure and possibly additional heat on the high frequency pretreated, continuous chip cake. Behind the calibration device a cutting device 20 is provided so that panels cut to length 21 by means of a stacking device 22 can be stored.

The object on which the invention is based is achieved when the Distance a between the first heated press and the first downstream of this press Compressive means is changed. In the case shown, all printing roller pairs would be 13, 15, 17, in the case of additionally provided steel strips 18 and 19, these also together to be relocated, in the case of calibration rollers to which no endless steel belts are assigned, the first pair of pressure rollers could be removed.

Claims (2)

PATENT CLAIMS 1. Device for the continuous production of chipboard a fleece that can be influenced by contact heat and high frequency energy, its particles are mixed with heat-hardenable binders, consisting of a non-woven carrier, a forming station arranged above this for forming the chip fleece, a heatable, continuously working press and a downstream, several double; roll having device with several behind the heatable, continuously working Press arranged, the generation of high-frequency alternating fields serving means and compressive forces on the apron belt exerting device, which is a further continuous working press and / or calendering rollers, according to patent ... ... (P 21 13 763.3-15), d a d u r c h e k e n n n z e i c h n e t that the distance (a) between the heatable Press (7) and the first, this press downstream, exerting pressure forces Means (13) can be changed. 2. Apparatus according to claim 1, d a d u r c h g e k e n n -z e i c h n e t that the first pressure forces arranged behind the heatable press (7) ausühende means tal3) is arranged so that it can be removed or moved out. L e r s e i t e