Paper products and methods and systems for manufacturing such products

Patent metadata

Field	Value
Publication number	US-10619308-B2
Application number	US-201816035005-A
Country	US
Kind code	B2
Filing date	Jul 13, 2018
Priority date	Apr 30, 2008
Publication date	Apr 14, 2020
Grant date	Apr 14, 2020

Abstract

Methods of producing cellulosic or lignocellulosic materials for use in papermaking include treating a cellulosic or lignocellulosic dry feedstock having a first average molecular weight with ionizing radiation, and controlling the dose of ionizing radiation such that the average molecular weight of the feedstock is reduced to a predetermined level. A method of producing an irradiated paper product includes treating a paper product including a first carbohydrate-containing material having a first molecular weight with ionizing radiation, and controlling the dose of ionizing radiation so as to provide an irradiated paper product with a second carbohydrate-containing material having a second molecular weight higher than the first molecular weight. Pulp and paper products are produced.

First claim

What is claimed is:

1. A method of treating paper, the method comprising:
directing positively charged ions to be incident on paper having a paper weight between 20 lb and 32 lb,
the positively charged ions having been provided by forming a plurality of negatively charged ions, accelerating the negatively charged ions to a first energy, removing a plurality of electrons from at least some of the negatively charged ions to form positively charged ions, and accelerating the positively charged ions to a second energy.

2. The method of claim 1 wherein the paper has a density between 250 kg/m 3 and 1500 kg/m 3 .

3. The method of claim 1 wherein the paper comprises printing paper.

4. The method of claim 1 wherein the paper comprises recycled paper.

5. The method of claim 1 wherein the positively charged ions have an energy of about 4 MeV.

6. The method of claim 1 further comprising forming the positively charged ions in a folded tandem accelerator.

7. The method of claim 1 wherein the ions are selected from the group consisting of hydrogen ions, carbon ions, oxygen ions, halogen ions, and metal ions.

Assignees

• Xyleco Inc

Inventors

• Medoff Marshall

Classifications

• D21C9/007

  by mechanical or physical means · CPC title

• D21B1/06

  by dry methods · CPC title

• D21F7/00

  Other details of machines for making continuous webs of paper · CPC title

• D21C1/10

  Physical methods for facilitating impregnation · CPC title

• D21H11/20

  Chemically or biochemically modified fibres · CPC title