Roll or roller – Rotatable relative to supporting shaft
Patent
1992-12-21
1995-02-28
Cuda, Irene
Roll or roller
Rotatable relative to supporting shaft
492 7, 492 70, 492 54, B23P 1500
Patent
active
053932900
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
The invention relates to a roll with a rotationally fixed carrier and a roll jacket which is rotatable about the carrier and supported relative to the carrier by at least one support element exerting a supporting force in a pressing plane, the roll jacket being built up of a plurality of several concentric zones of different characteristics, and to the use of the roll for cooling or heating purposes.
Such so-called deflection controlled rolls equipped with support elements of controllable support force and having a multi-layered roll jacket are for example known from DE 35 25 950 and are used for the thermal treatment of webs of material. In this arrangement, the individual layers of the roll jacket have differing physical, and in particular thermal, characteristics.
As a rule, the inner zone of the roll jacket consists of a hard material, for example metal, and the outer zone of a soft material, for example an elastomer such as soft caoutchouc or the like. Such deflection controlled rolls with roll jackets of this known kind are however only conditionally suited for some uses, for example for the thermal treatment of a paper web in a smoothing calender or for the thermal treatment or manufacture of a plastic foil. It is in particular a disadvantage that the outer zone has a poor thermal conductivity so that good thermal dissipation is not guaranteed and the temperature can only be kept inadequately constant during the treatment of the web of material.
The use of deflection controlled rolls for plastic foil pouring plants is for example known from DE-A-33 00 251. In this arrangement the flowable plastic composition is directed between two rolls and is brought to a desired thickness profile during solidification by means of the controllable support force of the support elements of the deflection controlled roll. Such deflection controlled rolls with roll jackets of the known kind are however only poorly suited for certain plastics which exhibit a relatively sudden transition between the flowable and the solid state in a narrow temperature range. On the one hand, with such rapidly solidifying plastics, for example polyethylene, the pressing and thickness control processes must take place at a precisely determined time point at a temperature which is as exact as possible, which is not required to the same degree with thermoplastics with a larger solidification range. On the other hand, rapidly solidifying plastics tend to stick during the solidification process to the customary roll surfaces.
SUMMARY OF THE INVENTION
The object underlying the invention is to remove the above-mentioned disadvantages of the prior art, and in particular to provide a roll with controllable support force which makes it possible to keep the temperature in a roll gap in a narrow tolerance range and thus to improve an ideal thermal treatment of the webs of material and also to improve the manufacture of plastic foils from rapidly solidifying plastics.
This object is satisfied in accordance with the invention essentially in that the roll jacket has a load carrying inner zone of elastically deformable material and also a non-load carrying outer zone which has a good thermal conductivity and a thickness of up to 1 mm.
Through the selected combination of layers of specific characteristics and thicknesses, it is on the one hand possible to exploit the advantages of a deflection controlled roll in its entirety and, on the other hand, to ensure a sensitive and exact temperature control in the roll gap since the thermal capacity of the outer zone can be accurately predetermined through the choice of the material and the thickness dimension and no disturbing influence is present through the inner zone.
Moreover, through this construction it is possible to achieve a reduction of the mass of the roll jacket in comparison to metal rolls, and therewith an improvement of the dynamic characteristics such as, for example, the vibration damping. It is furthermore of particular advantage that the danger of damage or des
REFERENCES:
patent: 3618190 (1971-11-01), Vernazza et al.
patent: 3937246 (1975-06-01), Salo et al.
patent: 4099487 (1978-07-01), Wouters
patent: 4233011 (1980-11-01), Bolender et al.
patent: 4498383 (1985-02-01), Pav et al.
patent: 4518460 (1985-05-01), Hauser et al.
patent: 4614565 (1986-09-01), Riihinen
patent: 4637109 (1987-01-01), Bryer
patent: 4821384 (1989-04-01), Arav
patent: 4850088 (1989-07-01), Speak
patent: 4870731 (1989-10-01), Yano
patent: 4888464 (1989-12-01), Shibata et al.
patent: 4998333 (1991-03-01), Skytta492 20
Lehmann Rolf
Schnyder Eugen
Cuda Irene
Sulzer-Escher Wyss GmbH
LandOfFree
Roll with adjustable deflection does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Roll with adjustable deflection, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Roll with adjustable deflection will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-845245