Low density multilayer papermaking fabric
AssigneeAlbany International Corp.
InventorEdward R. Hahn
Life of this patent
Estimating the term…
Abstract
A papermaking fabric of the multilayer type having threads of a multiple layer thread system extending in one fabric direction and threads of a single layer thread system extending in the other fabric direction which are interwoven with the threads of each of the multiple layers. The threads of the single layer thread system are spaced apart from one another, and threads of the several layers are tiered above one another with spacing between tiers, so that the fabric has a significant projected open area that allows spray water to penetrate the fabric. The fabric may also have an increased void volume in its interior and binding points between thread systems that are well spaced from one another to enhance the papermaking qualities of the fabric.
Claims15
In a multilayer papermaking fabric having a single layer thread system with threads extending in one direction of the fabric and a multiple layer thread system with threads extending in a direction normal to the threads of the single layer system, the combination of:
- threads in an upper layer of said multiple layer thread system being grouped with threads in a lower layer of said multiple layer thread system, with threads of a group being stacked one above the other;
- threads of said single layer thread system interweaving with the threads of each layer of the multiple layer thread system;
- and
- the projected open area of the fabric being within 13 to 25 percent of the total fabric area.
In a multilayer papermaking fabric of interwoven threads having a single layer thread system with threads extending in one direction of the fabric and a multiple layer thread system with threads extending in the other fabric direction, the combination of:
- threads in an upper layer of said multiple layer thread system being horizontally spaced from one another, and threads in a lower layer of said multiple layer thread system also being horizontally spaced from one another;
- threads of said single layer thread system interlacing with threads of both the upper and lower layer of said multiple layer thread system, and being spaced apart from one another with the spacing between threads being such that the thread density of the single layer thread system is within a range of about 0.50 to 0.65;
- and
- the projected open area of the fabric being within 13 to 25 percent of the total fabric area.
In a multilayer papermaking fabric of interwoven threads having a single layer thread system extending in one direction of the fabric and a multiple layer thread system extending in the other fabric direction, the combination of:
- threads in said multiple layer system being grouped with threads of a group being stacked one above the other;
- the upper thread of a group having a weave repeat pattern of passing over a number of threads of the single layer system and then passing under a thread of the single layer system to bind with the single layer thread system;
- the lower thread of a group having a weave repeat pattern of passing under a number of threads of the single layer system and then passing over a thread of the single layer system to bind with the single layer thread system;
- the number of single layer threads residing in an interior position between a binding of the upper thread and a binding of the lower thread being at least two;
- and
- the projected open area of the fabric being within about 13 to 25 percent of the total fabric area.
In a multilayer papermaking fabric having a single layer thread system interwoven with a multiple layer thread system, the combination comprising:
- threads of said single layer thread system being spaced apart from one another with the thread density of the system being within about 0.50 to 0.65;
- and
- said fabric having openings passing straight through the fabric with the resultant projected open area being within about 13 to 25 percent of the total fabric area.
Dependencies are inferred from the claim text.