Methods To Control Organic Contaminants In Fibers Using Zeolites

a technology of organic contaminants and fibers, applied in the field of papermaking processes, can solve the problems of inefficiency, maintenance problems and production inefficiencies, need to bleach fibers, and difficulty in controlling or removing them,

Inactive Publication Date: 2015-02-26
BUCKMAN LAB INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0021]A feature of the present invention is to provide methods to control organic contaminants present in fibers that contain organic contaminants. A further feature of the present in...

Problems solved by technology

Organic contaminants are present in paper pulp that tends to deposit on processing surfaces and equipment, causing maintenance problems and production inefficiencies.
Once caustic agents are used, some yellowing of the fibers can occur which may result in a need to bleach the fibers.
The variable nature of stickies is one of the reasons that controlling or removing them can be difficult and unpredictable.
Also, the use of recycled fiber has been increasing and is expected to continue growing, making stickies a more significant problem.
Recycled paper fibers contain many components that when repulped in recycle fiber plants become stickies.
Stickies deposit on machine surfaces, fabrics, wires, felts, rolls and dryers lead to problems such as wet end breaks, pressroom breaks, dryer section breaks, holes, sheet defects, and high dirt counts.
These deposits and associated problems lead to a significant amount of downtime yearly.
Floating removes intermediate size stickies (50-300 microns), which are troublesome, because they are small enough to be accepted by screening and cleaning but too large to be removed by washing.
Measuring and controlling stickies in a recycled paper manufacturing process has always been a challenge.
Variations in recycled paper quality and the trend to increase the amount of waste paper incorporated into each ton of pulp produced are each contributing factors that make this challenge even more difficult to address.
These variations make predicting the amount of...

Method used

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  • Methods To Control Organic Contaminants In Fibers Using Zeolites

Examples

Experimental program
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Effect test

example 1

Testing Procedure for Detackification Testing

[0107]Take 500 ml of tap water in 1000 ml beaker and place beaker on a hot plate with temperature control and magnetic agitation. Use Ethylene-vinyl acetate (EVA) as a model of tack stickies. Warm up water to designed temperature and add EVA into water at designed concentration. Start agitation at designed speed for certain period of time. Dilute the test samples and add in stickies solution under agitation, continue to agitate the mixture for designed time and remove samples from the hot plate. Place a black filter paper on a funnel filter. Carefully filter the mixture of solution through the filter paper. Remove the filter paper and dry it on a hot plate. Use a coated paper to cover on the filter paper and place them in a heated carver press at 220° F. and 5000 psi for 2 minutes. Remove coated paper from the filter paper and use the filter paper for testing.

[0108]Stickies Counting:

[0109]Use a scanner to scan the filter paper and use Use...

example 2

Pulmac Testing (Using Recycled Pulp)

[0133]Testing procedure for pulp stickies testing:[0134]Pulmac Master Screen was used for stickies test for recycled pulp.[0135]Testing conditions: OCC pulp obtained from paper mill.[0136]After screening, use coated paper to cover on black filter paper and place them in a heated carver press at 220° F. and 5000 psi for 3 minutes. Remove coated paper after heating press and use the same stickies counting method as mentioned above for stickies analysis.

[0137]Table 4 and FIG. 2 show the comparison of zeolite formulation with some existing commercial non-zeolite containing products in stickies reduction in pulp by using Pulmac testing. Zeolite formulation (Z-1) provided better efficiency on stickies reduction.

[0138]As can be seen in Table 4 and FIG. 4, the zeolite formulation (Z-1) had almost comparable reduction in “count” but more importantly was able to reduce the size of the stickies better than the enzymes alone or with Diatomaceous earth.

TABLE 4...

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Abstract

Methods to control organic contaminants in fibers are described. One method involves contacting the fibers with a) at least one zeolite and optionally b) detackifier, or an ester hydrolyzing enzyme, or both, for a sufficient time and in a sufficient amount to control the organic contaminants present in the fibers. This method is effective to reduce stickies in paper mill furnish formed with recycled fibers. A method for pitch control in paper mill furnish formed with virgin fibers is also provided. Resulting paper products formed from the processed fibers are also described as well as methods to make them.

Description

[0001]This application claims the benefit under 35 U.S.C. §119(e) of prior U.S. Provisional Patent Application No. 61 / 867,644, filed Aug. 20, 2013, which is incorporated in its entirety by reference herein.BACKGROUND OF THE INVENTION[0002]The present invention relates to papermaking processes and more particularly relates to controlling the organic contaminants present in certain types of fibers used to make paper or similar types of fiber containing products.[0003]Organic contaminants are present in paper pulp that tends to deposit on processing surfaces and equipment, causing maintenance problems and production inefficiencies. Organic contaminants of significant concern in this regard include “stickies” and pitch, with the former generally associated with recycled pulp sources while the latter with virgin pulp supplies.[0004]Conventional recycling of old paper products such as old newsprint, old corrugated containers, and mixed office waste is an important aspect of paper mills to...

Claims

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Application Information

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IPC IPC(8): D21C9/08D21C5/02D21C5/00
CPCD21C9/083D21C5/022D21C5/005D21C9/08D21H17/68D21H21/02
Inventor BAN, WEIPINGTHOMAS, GEORGE S.
Owner BUCKMAN LAB INT INC
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