Paper making and fiber liberation – Apparatus – Web creping or crinkling type
Patent
1998-06-19
2000-09-19
Hastings, Karen M.
Paper making and fiber liberation
Apparatus
Web creping or crinkling type
1525651, D21G 300
Patent
active
061206490
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to a blade holder for creping of a web, particularly a paper web, travelling on a rotating cylinder, or for doctoring a rotating cylinder surface.
The development in the paper manufacture technology has resulted in demands for ever increasing production rates coupled to increasing web widths. Today plants are installed having paper speeds of up to 1500 m/min and with paper widths which in some cases are up to 8 m or more. Such plants require great precision with regard to blade suspension and possibility of section-wise individual adaptation of the engagement pressure of the blade across the whole width of the web. Furthermore, the high costs associated with even short standstill of a large machine require that machine maintenance in the form of for example blade replacement can be carried out quickly and effectively with a minimum of time waste. Furthermore, there is required for obtaining optimal function the possibility of adjusting the blade angle of attack in relation to the cylinder on which the paper web is fed in a simple manner.
The present invention has for its object to provide a blade holder device for creping of web travelling on a rotating cylinder or for doctoring a cylinder surface, said device meeting high demands in the respects as indicated above.
Accordingly, the invention has for a primary object to provide a blade holder for creping of a travelling web, particularly a paper web, wherein the engagement pressure of the blade on the cylinder carrying the travelling web can be adjusted along the whole length of the blade without changing the blade angle of attack against the cylinder surface.
Another object of the invention is to provide a blade holder enabling easy exchange of blade at a minimum of time.
Yet an object of the invention is to provide a blade holder by which the blade angle of attack against the cylinder carrying the travelling web can be varied in a simple manner without affecting other parameters.
Another object is to provide for a simple method of adjusting the blade holder for varying blade widths.
A further object is to provide possibility for section-wise individual adjustement of the engagement pressure of the blade against the cylinder.
For these and other objects which will be clear from the following description there is provided through the present invention a blade holder for creping of a web, particularly a paper web, travelling on a rotating cylinder, or for doctoring the surface of the cylinder, comprising a blade directed opposite to the travelling direction of the cylinder, a blade holder for the blade, further comprising a pressure ledge extending along the whole length of the blade and arranged to exert a pressure at or adjacent to the upper longitudinal edge of the blade via pivotable pressure arms evenly distributed along the length of the ledge and arranged on the blade holder to bring said edge to engagement against the cylinder. Said blade holder is characterized in that each pressure arm is arranged to be individually actuated by a pressure means having a double folded membrane for actuation of the pressure arm by means of a pressure medium.
According to a preferred embodiment of the blade holder according to the invention each pressure arm has associated therewith an individually adjustable counter-pressure means whereby the actuation of the blade by the pressure means can be balanced.
In a particularly preferred embodiment of the blade holder according to the invention the membrane is provided with a double folded annular member, said member comprising a central section surrounded by said member cooperating with a stop member fixed onto the blade holder, and a ring-shaped section surrounding the annular section, said ring-shaped section being leak-tight connected to a surrounding ring element, said membrane and a corresponding lid element together with the ring element defining a pressure chamber which, via an opening, can be pressurized to a desired pressure by means of a pressure medium, said pressure affecting the
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patent: 5738726 (1998-04-01), Kaipf et al.
patent: 5868841 (1999-02-01), Halmschlager
BTG Kalle Inventing AB
Hastings Karen M.
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