Machine for producing a paper web, in particular a sack paper web

A paper width and machine technology, which is applied in the field of machines for bag paper width, can solve problems such as poor filling characteristics, and achieve the effects of improving ductility, lowering repair and maintenance costs, and reducing tensile force.

Active Publication Date: 2013-05-08
VOITH PATENT GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

As a result, the filling characteristics of the bag are still worse than conventional

Method used

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  • Machine for producing a paper web, in particular a sack paper web

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Embodiment Construction

[0022] in figure 1 Shown in is a machine used to make single-layer bag paper. Through the headbox 1, the material suspension is evenly distributed across the width of the forming wire. The net part 2 is designed here as a long net part, that is, the suspension is only dehydrated downward through the forming net. As an alternative, double wire formers are also possible, in which the suspension is applied between two forming wires and dewatered towards both sides (upper and lower). The shown mesh part is equipped with a vibrating screen device 8 which makes the screen move back and forth quickly in the transverse direction. This positively influences fiber orientation and paper formation and achieves higher strength in the paper web. The press section 3 has only one shoe press nip composed of a pair of rollers and a shoe press roll 9. In the embodiment shown, the shoe press roll 9 is above and the counter roll is below. The shoe press nip is double-laid with felts (befilzen)...

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Abstract

The invention relates to a machine for producing a compacted or non-compacted sack paper web (12), said machine having a head box (1), a screen section (2), a press section (3), a dry section (4A and 4B) and a winding unit (7) and the press section (3) consisting of a single press nip that is designed as a shoe press nip, said nip being formed by a counter-roll and a shoe press roll (9).

Description

Technical field [0001] The invention relates to a machine for manufacturing a paper web for bags that is upset or unupset. The machine has a headbox, a wire section, a press section, a dryer section and a paper roll unit. Background technique [0002] Bag paper, also called kraft paper bag paper, is made of pulp fiber, mainly made of long-fiber pulp, because it has greater strength and greater paper porosity. Made of bag paper, for example, bags used for packaging cement or other powdered products. The important characteristics of bag paper are greater strength, greater porosity and sufficient stiffness when stretched sufficiently. This feature is necessary due to the load of the bag during transportation and the load during bag filling. This should happen as quickly as possible and not only requires greater strength and stretchability, but also greater porosity or air permeability. Therefore, a large amount of air leaks out of the empty bag through the bag paper during fillin...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D21D1/30D21F1/20D21F11/00D21G1/00D21F3/02D21F1/02B31F1/12
CPCD21H25/12D21F1/20D21F11/00D21F1/022D21D1/30D21H27/10D21G1/00D21F3/0218
Inventor G.贝科夫斯基W.施瓦茨
Owner VOITH PATENT GMBH
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