Back to results
US 3,930,464 AGranted
Apparatus for applying a coating composition onto a web
AssigneeInventing S.A.
InventorHans Ivar Wallsten
Life of this patent
Estimating the term…
Abstract
A method and apparatus for applying a coating composition onto a web, in which the coating composition is subjected to a first general smoothing during the passage of the web between relatively stiff surfaces of a primary coating member and the final smoothing of the coating is effected in a nip formed between relatively flexible flat surfaces of a secondary coating member. Said coating members being spaced from each other in the running direction of the web. The web is both stabilised and pre-coated by the primary coating member, whereas the coating is finalised by the secondary coating member.
Claims15
Apparatus for applying a coating composition to a paper web comprising:
- means for guiding the web to move in an upward direction through the coating apparatus which includes:
- a first pair of rigid, elongated, upwardly converging opposed members positioned on opposite sides of the upwardly moving web, and each having stationary contact surfaces;
- means connected to said first pair of members for adjusting the coating contact surfaces of each of said first pair of members in adjustably spaced fashion, said first members converging upwardly and inwardly from said adjusting means towards said web whereby their contact surfaces form predetermined gaps each being defined by the surfaces of said web and the adjacent contact surfaces of said members, said gaps, once adjusted, being maintained in substantially constant alignment throughout a coating operation;
- coating dispensing means positioned adjacent to said gaps and being spaced from the web for continuously directing a quantity of the coating composition in liquid form toward the surfaces of said web as the web moves upwardly and before the web leaves the gap region between the contact surfaces of said first members;
- the width of said gaps being selected to uniformly spread an excess amount of the coating composition upon the surface of the web, said members cooperating with the coating composition, as the web passes between said members, to substantially reduce lateral movement of and thereby stabilize the web during the smoothing operation;
- and
- upwardly converging flexible means positioned adjacent and above said opposed members and forming a nip engaging the opposite surfaces of the web for removing the excess coating composition from said web and uniformly regulating the final thickness of the coating.
4 more elements
Apparatus for applying a coating composition to a paper web comprising:
- means for guiding the web to move in an upward direction through the coating apparatus which includes:
- a first pair of rigid elongated upwardly converging opposed members positioned on opposite sides of the upwardly moving web and each having a stationary contact surface;
- means for adjusting the coating contact surfaces of said first pair of members, which extend upwardly and inwardly from said adjusting means, in adjustably spaced fashion to form predetermined gaps each being defined by the surfaces of said web and the adjacent contact surfaces of said members, said gaps, once adjusted, being maintained in substantially constant alignment throughout a coating operation;
- coating dispensing means for continuously directing a controlled quantity of the coating composition in liquid form toward the surfaces of said web as the web enters the gap region between said members and before the web leaves the region between the contact surfaces;
- the width of each gap being selected to uniformly spread an excess amount of the coating composition upon the surfaces of the web to create a dynamic liquid pressure of the coating composition in order to substantially reduce lateral movement of the web and thereby stabilize the web to prevent fluttering during the coating operation;
- and
- secondary coating means comprising a pair of upwardly converging thin flexible members having their adjacent edges arranged to form a nip through which said web passes for removing the excess coating composition from said web and thereby uniformly regulating the final thickness of the coating.
4 more elements
Dependencies are inferred from the claim text.