Dry production of a non-woven fibre web
First Claim
1. A method for dry production of a non-woven fiber web that includes at least relatively short and relatively long fibers, wherein the method comprises the following process steps:
- generating that a first air flow that contains short fibers from a fiber source, passing the first air flow through a first perforated screen having openings of a size that allow open, but not unopen, short fibers to pass therethrough, passing the first air flow through an air-permeable first forming wire running endlessly during operation to form a non-woven layer of short fibers thereon, generating a second air flow that contains short fibers from the non-woven fiber layer that is formed on the forming wire, generating a third air flow that contains long fibers from a fiber source of same, passing the second and third air flows through a second perforated screen having openings of a size that allow both short and long fibers to pass therethrough, passing the second and third air flows through an air-permeable second forming wire running endlessly during operation to form a fiber layer on the second forming wire, and preparing a non-woven fiber web from the fiber layer from the second forming wire.
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Accused Products
Abstract
A plant that includes two air-lay stations placed one after the other serving for the dry production of a non-woven fiber web. Each station includes a fiber feed duct for feeding fibers to the station from a fiber source, an air-lay forming head connected to the fiber feed duct and at least partly defined by a perforated screen, and a suction box for successively sucking fibers in the forming head through the screen. A separate fiber source is part of each station. The first station furthermore has a fiber collector placed under the screen of its forming head whereas the second station has a forming wire placed under the screen of its forming head. The two stations are connected to at least one conveyor for conveying fibers from the fiber collector of the first station to the forming head of the second station. By means of the plant, a cotton fiber web on the basis of Cotton Linters Pulp and thermobinding fibers can be produced which, considering its quality, are price competitive with corresponding fiber webs based on cellulose pulp. This cotton fiber web has a homogenous, nit-free structure which is desirable for use in various products.
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Citations
16 Claims
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1. A method for dry production of a non-woven fiber web that includes at least relatively short and relatively long fibers, wherein the method comprises the following process steps:
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generating that a first air flow that contains short fibers from a fiber source, passing the first air flow through a first perforated screen having openings of a size that allow open, but not unopen, short fibers to pass therethrough, passing the first air flow through an air-permeable first forming wire running endlessly during operation to form a non-woven layer of short fibers thereon, generating a second air flow that contains short fibers from the non-woven fiber layer that is formed on the forming wire, generating a third air flow that contains long fibers from a fiber source of same, passing the second and third air flows through a second perforated screen having openings of a size that allow both short and long fibers to pass therethrough, passing the second and third air flows through an air-permeable second forming wire running endlessly during operation to form a fiber layer on the second forming wire, and preparing a non-woven fiber web from the fiber layer from the second forming wire. - View Dependent Claims (2)
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- 3. A plant for dry production of a non-woven fiber web comprising two air-lay stations placed after each other and each comprising at least one fiber feed duct for feeding fibers to the station from a fiber source, at least one air-lay forming head connected with the fiber feed duct and at least partly defined by a perforated screen, a suction box for successively sucking fibers through the screen, a separate fiber source associated with each of the two stations, a fiber collector associated with the first station and placed under the screen of its forming head(s), a forming wire associated with the second station and placed under the screen of its forming head(s), and at least one conveyor associated with the two stations for conveying fibers from the fiber collector of the first station to the forming head of the second station.
- 11. A non-woven air-laid fiber web comprising a mixture of thermobinding fibers and Cotton Linters Pulp which is mainly screened of unopen fibers.
- 15. In a method for producing a non-woven fiber web, the improvement which comprises combining Cotton Linters Pulp together with thermobinding fibers to produce the web.
Specification