Machines for the manufacture of paper webs, especially sack paper webs

A paper format and machine technology, which is applied in the field of bag paper format machines, can solve problems such as poor filling characteristics, and achieve the effects of improving ductility, reducing tension, and low repair and maintenance costs

Active Publication Date: 2016-05-11
VOITH PATENT GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

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

Method used

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  • Machines for the manufacture of paper webs, especially sack paper webs

Examples

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Effect test

Embodiment Construction

[0022] exist figure 1A machine for making single ply sack paper is shown in . Via the headbox 1, the material suspension is evenly distributed over the width of the forming wire. The wire section 2 is here designed as a long-form wire section, that is to say the suspension is only dewatered by the forming wire towards the bottom. As an alternative, twin wire formers are also possible, in which the suspension is applied between two forming wires and dewatered towards both sides (upper and lower). The wire section shown is equipped with a vibrating screen device 8 which moves the screen rapidly back and forth in the transverse direction. This positively influences fiber orientation and sheet formation and achieves higher strength in the paper web. The press section 3 has only a single shoe press nip formed by counter roll and 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 a fe...

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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 producing upset or unupset sack paper webs, the machine having a headbox, a wire section, a press section, a dryer section and a reeling unit. Background technique [0002] Sack paper, also known as kraft sack paper, is made from pulp fibers, mainly long-fiber pulp because of its greater strength and greater paper porosity. Manufactured from bag paper such as bags used to pack cement or other powdered products. The important properties of sack paper are greater strength, greater porosity and sufficient stiffness when stretched sufficiently. This characteristic is necessary due to the load of the bag when it is transported and the load when the bag is filled. This should take place as quickly as possible and for this requires not only greater strength and elasticity but also greater porosity or air permeability. As a result, a large amount of air leaks out of the empty bag through the bag paper when filling. Ot...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21D1/30D21F1/20D21F11/00D21G1/00D21F3/02D21F1/02B31F1/12
CPCD21F11/00D21D1/30D21F1/022D21F1/20D21F3/0218D21G1/00D21H25/12D21H27/10
Inventor G.贝科夫斯基W.施瓦茨
Owner VOITH PATENT GMBH
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