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multilayer cardboard

A multi-layer cardboard and cardboard technology, applied in papermaking, paper/cardboard layered products, paper, etc., can solve problems such as insufficient supply of softwood pulp

Active Publication Date: 2020-06-30
STORA ENSO OYJ
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, high quality cork is only available in limited regions of the world and the supply of softwood pulp available in paperboard manufacturing is insufficient relative to the global demand for high quality paperboard

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment

[0070] In order to evaluate the high quality paperboard of the present invention, a test series was carried out in which a paperboard with a back ply comprising 100% unbleached hardwood pulp was compared to a conventional paperboard comprising softwood pulp. In the tests, both paperboards were of three-ply construction, with a face and a back and middle ply.

[0071] The strength properties, surface properties and optical properties of each paperboard were studied. All tests were performed according to the methods and standards indicated above, all analyzes were performed after conditioning at 23°C, 50% RH according to available standards.

[0072] cardboard sample

[0073] Two three-ply paperboards, each having a top and back ply and a middle ply, were produced using an Automatic Dynamic Sheet Former (Formette Dynamique). The basis weight of the paperboard was about 185 gsm with a weight distribution of: top ply-middle ply-back ply = 40-110-35 gsm.

[0074] The properties ...

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Abstract

The invention discloses a multilayer paperboard for liquid and / or food packaging comprising a face ply, a back ply and at least one intermediate ply arranged between said face ply and said back ply. The invention is characterized in that the backing layer is made of up to 100% by weight of unbleached hardwood pulp, calculated on the basis of the total fiber weight of the backing layer. It has surprisingly been found that the use of unbleached pulp in the back ply allows the use of 100% hardwood fibers in the back ply (calculated on the basis of the total fiber weight of the back ply) and still obtain acceptable strength and bending resistance Durable high-quality cardboard.

Description

technical field [0001] A multilayer paperboard comprising chemical pulp and mechanical pulp of cellulose fibers. Background technique [0002] There are numerous applications in which paperboard is used. All of these applications place their own specific requirements on the paperboard and therefore the properties of the paperboard necessarily differ depending on the intended end use. [0003] Paperboard to be converted (eg, coated, printed, cut, folded and folded) on fast-moving robotic machinery must have the required strength to withstand the strains and stresses incurred during the conversion. The paperboard must also have high resistance to bending, allowing good runnability during conversion. Properties such as flatness and dimensional stability are also important during conversion. [0004] Paperboard used in packaging applications such as packaging for liquid or dry food products must protect the contents from the surrounding environment. Packaging must further pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): D21H27/30B32B29/00
CPCD21H27/10D21H27/38D21H17/24B32B29/005B32B29/02B32B2262/062B32B2307/54B32B2307/546B32B2439/70D21H11/04D21H17/29
Inventor H.哈尔格伦F.彭
Owner STORA ENSO OYJ
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