Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Patent
1989-02-16
1991-05-21
Bennet, Henry A.
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
34155, F26B 1300
Patent
active
050163639
DESCRIPTION:
BRIEF SUMMARY
CROSS REFERENCE TO RELATED APPLICATION(S)
This United States application stems from PCT International Application No. PCT/DE88/00275 filed May 6, 1988.
BACKGROUN OF THE INVENTION
The invention relates to a device for acting upon and float-conveying webs of material, more particularly paper webs.
In known devices in which air is blown against a moving web in order to dry it, "nozzle chambers" are present and air is discharged therefrom towards the web, normally through slot-shaped nozzles (e.g., see German Patent Reference No. DE-PS 31 30 450). The nozzle chambers are spaced apart in the direction of travel of the web, the intermediate spaces serving as air outlets. The process of conveying webs of material through such devices is beset with numerous problems. More particularly the web must be held in transit so as to avoid contact with the nozzle chambers or other parts of the device, since otherwise the web may be damaged or its surface may be adversely affected.
BRIEF SUMMARY OF THE INVENTION
An object of the invention is to take account of the existing difficulties and construct a device of the initially-mentioned kind which guide s the web in transit with particularly good efficiency and also obtains the other desired effects, i.e. dries the web or the surface thereof, in advantageous manner. The invention also aims at an advantageous construction of the device in particular. Other associated problems addressed by the invention will be clear from the following explanation Of the disclosed solution.
According to the invention, a guide element extending as far as the nozzle chambers is disposed between each pair thereof on at least part of the web path, and has a closed central area and orifices at the side thereof and opening into the air outlets; lateral areas are provided on the nozzle boxes and project beyond the adjacent parts of the guide elements in the direction towards a longitudinal plane through the web path, and the angle between the outsides of the lateral areas and the longitudinal plane is not less than 90.degree..
In an aforementioned device, the moving web is guided with particular efficiency and is protected from damage, and also advantageous effects are obtained. More particularly the web can be guided in corrugated manner, which is very advantageous in many cases.
The lateral areas on the nozzle chambers, which project beyond the guide elements in the direction of the plane in which the web moves, can be at an angle of up to 90.degree. to the aforementioned plane. In a very advantageous embodiment the lateral areas are constructed so that they extend backwards like an undercut. The lateral areas are advantageously substantially planar, but a curved embodiment is not excluded.
Advantageously a well-defined edge is formed at the transition between the lateral areas of the nozzle chamber and the end face thereof. This is particularly advantageous as regards flow conditions.
The guide elements between the nozzle chambers can have various forms. Advantageously the closed central area of each guide element is made planar.
The guide element can have inclined parts, more particularly in a transition region between the central part and edge regions. Advantageously at least some of the orifices are formed in the inclined parts.
In a device of the previously-explained kind, the nozzle chambers themselves can be constructed in various ways. Particularly advantageously, individual air outlets, each opposite a respective guide surface for the air flow, are provided in the nozzle region of each nozzle chamber in the wall parts adjacent the air duct on both sides of a transverse plane in the longitudinal direction of the air duct and perpendicular to the plane in which the web moves.
The outlets can be mouthpieces, individual nozzles or the like. In a very advantageous embodiment the air outlets are holes in the wall parts of the air duct.
The nozzle chambers, including the guide elements between them, can be efficiently manufactured and operate satisfactorily even under varying conditions. Ev
LandOfFree
Device for float-conveying of webs of material does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Device for float-conveying of webs of material, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Device for float-conveying of webs of material will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-228887