Method for the production of tissue paper
a tissue paper and paper technology, applied in papermaking, multi-stage pulping process, digesters, etc., can solve the problems of too low dry content and difficult dewatering of tissue paper during the production process, and achieve high water absorption capacity and absorbency, and high level of productivity
Inactive Publication Date: 2009-08-20
VOITH PATENT GMBH
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Benefits of technology
The present invention provides a method for producing a tissue paper web with high water absorption capacity and tear resistance. The method involves using a pulp suspension with a refining degree of less than 21°SR and a specific refining degree range. The refining degree should be selected to achieve a specific breaking length measured according to TAPPI 205 SP (95) of at least 40 cm. The method also involves using a laboratory sheet with a specific refining degree to achieve a porosity of at least 40 cm and a gsm of 60 g / m2. The refining degree of the pulp suspension should be reduced to -19°SR or less, with a fiber content of at least 15% cellulose. The method can be performed at a high machine speed, with a maximum refining degree of 17°SR. The pulp suspension should have a water retention value of 1.5 g / g or less to achieve a satisfactory dry content. The method can be used with different types of tissue paper, such as toilet paper or towel paper, with specific fiber content ranges. The method improves dewaterability, water absorption capacity, and tear resistance of the tissue paper.
Problems solved by technology
Also, a high refining degree gives rise to a high water retention value for the fibers of the pulp suspension, making the tissue paper hard to dewater during its production process.
Furthermore, a high refining degree, meaning a high proportion of fines, reduces through too low a porosity and permeability the dewaterability of the tissue paper web during its production, leading often to too low a dry content for high production speeds such as 1200 m / minute.
Method used
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Embodiment Construction
[0092]FIG. 1 shows an apparatus 1 according to the invention for providing a pulp suspension which is subsequently used in the method according to the invention for the production of a tissue paper web.
[0093]Apparatus 1 includes a pulper 2 in which the dry raw stock, halfstuff and old paper is dissolved in water and converted into a pumpable state. The pulp thus formed is then conveyed to a mixing chest 3. At this stage the pulp has a consistency of less than 10%, i.e. as a rule 5% or less, and in this connection is referred to as low-consistency feed pulp.
[0094]Depending on whether the low-consistency feed pulp is one with high strength or one with low strength, the pulp is subjected to a refining process at low consistency or a refining process at high consistency.
[0095]If it is a low-consistency feed pulp of low strength, for example, it is possible to produce from the pulp at a refining degree of 15°SR a laboratory sheet according to TAPPI 205 SP 95 (Rapid Köthen) with only a sm...
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Abstract
A method for the production of a tissue paper web, which is produced from a pulp suspension comprised of fibers, the pulp suspension having a refining degree of less than 21°SR and being of such condition that it is possible to produce from said pulp suspension a laboratory sheet according to TAPPI 205 SP 95 (Rapid Köthen) whose breaking length measured according to TAPPI 220 and TAPPI 494 at least a specific refining degree (RDspecific) is greater than or equal to the value resulting from 0.55 (km / SR)*(RDspecific−10°SR), whereby the specific refining degree is selected from a refining range from 15°SR to less than 21°SR, in particular 15°SR to 19°SR.
Description
[0001]This is a division of U.S. patent application Ser. No. 11 / 497,061, entitled “METHOD FOR THE PRODUCTION OF TISSUE PAPER”, filed Aug. 1, 2006, which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]This invention relates to a method for the production of tissue paper and to a method for the production of a pulp suspension for use particularly for the production of tissue paper.[0004]2. Description of the Related Art[0005]Tissue paper ideally displays a high absorbency and a high water absorption capacity coupled with a high tear resistance. The absorbency and water absorption capacity are defined essentially by the volume and porosity of the tissue paper. To increase the volume it was already proposed in the prior art in WO03 / 062528 to press the tissue paper web during production only on a zone basis in order to obtain only slightly pressed or unpressed voluminous regions and pressed regions of greater tear resistance.[0006]The ...
Claims
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IPC IPC(8): D21C3/26D21C3/00D21C3/22D21C9/00
CPCD21C9/002D21F5/182D21H27/002D21F11/145D21F11/14
Inventor SCHERB, THOMASSILVA, LUIZ CARLOSBERARDI, ROGERIOOYAKAWA, DAILO
Owner VOITH PATENT GMBH