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Wood Pulp Paper with High Antimicrobial Barrier Level

a technology of antimicrobial barrier and wood pulp paper, which is applied in the direction of filter paper, separation process, filtration separation, etc., can solve the problems of deficient barrier and mechanical properties of paper prepared from synthetic materials

Inactive Publication Date: 2010-08-12
EI DU PONT DE NEMOURS & CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

This patent describes a type of paper made from wood pulp that has a high level of log reduction (LRV) and a specific density and basis weight. The paper is made from refined pulp with a low freeness and a short length. The patent also describes a multi-ply paper structure made from this special paper. The technical effect of this invention is to provide a high-quality paper with improved log reduction and a specific density and basis weight, which can be used in various applications such as printing and packaging.

Problems solved by technology

Although natural cellulose pulp papers have been improved through many years of use in medical packaging, their barrier and mechanical properties are deficient in comparison with papers prepared from synthetic materials.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 3

[0046]This example demonstrates preparation of a hard-nip calendered paper according to the present invention from hardwood pulp.

[0047]The paper sample of Example 3 was prepared as described for Example 1, but using Southern Bleached Hardwood Kraft pulp (supplied by International Paper Company) refined to 104 ml CSF with arithmetic mean length 0.45 mm, length-weighted mean length 0.66 mm and weight-weighted mean length 0.80 mm.

[0048]Properties of the paper are shown in Table 1 below.

example 4

[0052]This example demonstrates preparation of two-ply wood pulp papers using a combination of hardwood pulp in one ply and softwood pulp in the second ply, wherein the ratio of hardwood to softwood pulp was 50 / 50 based on weight.

[0053]The hardwood ply was made from 2.5 g (based on dry weight) of hardwood pulp as used in Example 2 and the softwood ply was made from 2.5 g of the softwood pulp from examples F-G, using the process as described for the foregoing examples.

[0054]Both wet-laid sheets were placed together between two pieces of blotting paper, hand couched with a rolling pin and dried in a handsheet dryer at 150° C. The 2-ply paper structure was then hard calendered.

[0055]Properties of the paper are shown in Table 1 below.

example 5

[0056]This example demonstrates preparation of 2-ply wood pulp papers using a two-ply combination of hardwood pulp in one ply and softwood pulp in the second ply was made the same way as in Example 4, except the hardwood ply was made from 3.75 g (based on dry weight) of hardwood pulp and softwood ply was made from 2.5 g of the softwood pulp, such that the ratio of hardwood to softwood pulp was 75 / 25 based on weight.

[0057]Properties of the papers are shown in Table 1 below.

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Abstract

Wood pulp papers are provided that are useful in end uses requiring microbial barrier properties such as medical packaging, air filters, liquid filters, and other uses and the papers have significantly improved bacterial barrier properties in contrast to wood pulp papers known in the art as measured by Log Reduction Values determined by ASTM F-1608.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]This invention relates to wood pulp paper with high antimicrobial barrier characteristics suitable for use in sterile packaging such as medical packaging, as well as air or liquid (e.g. water) filtration and other uses.[0003]2. Description of the Related Art[0004]Barrier to microbial penetration is an important and essential property of materials used for packaging medical devices and other items which must be sterilized. Materials currently used in medical packaging include a variety of films, flash-spun polyolefin nonwovens, and medical grade papers. In cases where gas or plasma sterilization (e.g., ethylene oxide, Sterrad®, etc.) is used to sterilize the contents of a package, the package generally includes a film, such as a thermoformed film, forming a bottom web that is heat-sealed to a porous and gas permeable lidding, such as paper or flash-spun polyolefin sheet. Alternately, the package may be in the form of a p...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): D21H27/30
CPCB01D39/18D21H13/10D21H15/02D21H25/005Y10T428/27D21H27/10D21H27/38Y10T428/24802D21H27/08
Inventor LEVIT, MIKHAIL R.BLETSOS, IOANNIS V.ROBERTS, DAVID CARL
Owner EI DU PONT DE NEMOURS & CO
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