2 edition of Chemical Processing AIDS in Papermaking found in the catalog.
Chemical Processing AIDS in Papermaking
Technical Association of the Pulp & Pape
by Books on Demand .
Written in English
|Contributions||Kevin J. Hipolit (Editor)|
|The Physical Object|
|Number of Pages||221|
The ratio of monomers was varied within limits of the invention and respective retention activities determined by a Phototester determination. The temperature of the system is raised to a desired point and the mixture is kept in motion by means of an agitator. The terpolymers of the invention have unusually good water-solubility, notwithstanding the high molecular weights of the products, and may be used as retention aids for all fiber furnishes including both bleached and unbleached primary or virgin chemical pulps, mechanical pulps, and secondary fibers, that is, fibers previously employed as paper stock. As was pointed out above, the heat transfer mecium plays an important part in the concentrated solution polymerization method. The following examples illustrate typical terpolymers and their method of preparation. Those compounds mentioned above are illustrative of suitable and readily available products.
A blank was run and then compared to samples in which the terpolymer retention aids of the invention had been previously added. The solid white terpolymeric product was isolated by filtration. The terpolymers of the invention have unusually good water-solubility, notwithstanding the high molecular weights of the products, and may be used as retention aids for all fiber furnishes including both bleached and unbleached primary or virgin chemical pulps, mechanical pulps, and secondary fibers, that is, fibers previously employed as paper stock. The last monomeric reactant to be discussed is a water-soluble ethylenically unsaturated monomer containing polar groups; examples of such monomers are acrylic acid and salts and alkyl esters thereof, vinyl pyrrolidone, vinyl acetate, methacrylamide, vinyl alkyl ethers such as methyl vinyl ether, methacrylic acid and salts and alkyl esters thereof, acrylonitrile, vinyl alcohol, methacrylonitrile, allyl alcohol, allyl amine, etc.
Higher pH mix enables creation of the smoother fibers, which is useful before its cutting to smaller pieces. Catalyst concentrations above 0. Evaluations after this course result in consistently high ratings for Dr. It is necessary, then, to add other substances, such as sizing, coloring agents, and fillers, to the cellulosic fibers to produce paper suited to its many uses. Overall, You Will
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The terpolymer retention aids may be added at almost any step in the normal mill process but it is greatly preferred they be added subsequent to the refining step. In order to produce terpolymers of exceedingly high molecular weight, and correspondingly proportional excellent retention ability, a special polymerization technique was employed.
Increase your ability to contribute to improving mill operations. As has been pointed out, a great many surface active agents can be used in the terpolymerization process.
Fillers also include the colored rags, dyes, or pigments that produce paper in a rainbow of hues. Chemical pulping methods produce high-quality papers as the chemical cooking dissolves most of the lignin and hemicelluloses present in the wood, resulting in better separation of the cellulose fibers.
For over 80 years Solenis has a profolio which includes a multitude of cost-effective products that improve pulping efficiency and pulp quality, including cooking aids, washing aids, pitch and scale control agents, brown stock defoamers and specialty programs.
Yet another alternative is neutral sulfite semichemical pulping, where the chips are mixed with a mixture of sodium sulfite and sodium carbonate in water and cooked.
Herty had saved these forests in by inventing a new method of extracting resin, used to make turpentine, that did not scar and damage the trees. In addition to possessing the above desirable characteristics an additive for improving filler and fines retention must be capable of acting both upon the filler and fines in the system to efficiently causes such materials to be retained in the finished sheet rather than with one being preferentially acted upon by the additive.
In the cylinder machine, there are several parallel vats into which similar or dissimilar dilute paper stocks are charged. The organic solvent system was prepared by adding 0. In a redox system, the catalyst is activated by means of a reducing agent, which in the absence of oxygen immediately produces free radicals without the use of heat.
All of these projects showed encouraging results, The operation of dynamic pump test loops continued; some Croloy materials tests with the higher zirconium concentrations indicate satisfactory corrosion resistance.
Updated October 09, By John Brennan Paper may seem like a commonplace and simple product, but its manufacture is actually more complicated than most consumers probably realize. Professional Development Credits You will earn 26 professional development hours or 2.
As the cylinder revolves further, the paper stock reaches a point where the wet layer comes in contact with and adheres to the moving felt. Samples were also made in which the respective monomers of the invention were separately polymerized and tested for their retention activity.
The monomers actually terpolymerize in a separate stratum within the above system in the presence of a surface active compound acting as the anti-sticking agent. In addition, certain of these known retention additives cannot be employed in effective combinations with various fillers or other paper additives.
More importantly, more work needs to be done to predict mechanical properties of novel alloys, like yield strength, and ductility. Mills use either one or the other alone or both together. Earn 2. This is especially important in tissue paper. Questions not answered in class or the interaction sessions are referred to other industry experts.
The next study made was to determine whether the temperature and catalyst concentration could be varied without affecting the retention activity of the formed terpolymers. The molecular structure of cationic starch. After a few seconds, 1. Also, the pH at which the terpolymerization is run may be changed without changing the effectiveness of the terpolymer retention additives.
One of the chief drawbacks of most chemicals used to improve a fiber and fine retention in the manufacture of paper is that they must possess certain characteristics and properties which are extremely difficult to achieve in any particular chemical.
Thanks to recycling, we recover 40 percent of this paper for reuse. This is evidence of the startling retention of the heavier inorganic fillers by the pulp network when the paper system is treated with a representative terpolymer retention aid of the invention.Nanocelluloses (NC) increase mechanical and barrier paper properties allowing the use of paper in applications actually covered by other materials.
Despite the exponential increase of information, NC have not been fully implemented in papermaking yet, due to the challenges of using NC. This paper provides a review of the main new findings and emerging possibilities in this field by focusing Author: Ana Balea, Elena Fuente, M.
Concepcion Monte, Noemi Merayo, Cristina Campano, Carlos Negro, Angeles. The TAPPI Introduction to Wet End Chemistry course equips you with the latest technology and terminology for optimum papermaking performance.
Instructors for this course know that quality products and cost savings are both important objectives, so they focus this three-day interactive training on innovative wet end chemistry principals and the use of additives to efficiently change or create.
Nov 07, · Chemical additives are used in the papermaking process for many different reasons, and they are often divided into two groups.
Functional chemicals directly improve properties of the sheet, while process chemicals affect operations on or near the paper machine. This module covers the second group - process chemicals.
The effects of the laccase treatment on papermaking or paper properties were not reported. In this study we examined the ability of commercially available polysaccharide-degrading enzymes and laccases to improve retention in newsprint furnishes, alone and in conjunction with chemical retention aids.
We are very happy to share with you the newest free ebook from Beetle Plastics Chemical Processing eBook: FRP Applications, Opportunities, and Solutions. In this eBook we cover: What are fiber reinforced polymers (FRP) The corrosion resistance offered by FRP Applications of FRP Engineering services Examples for FRP applications It’s important to understand the costs.
Chemical pulp is created by a method that uses chemicals and heat to convert wood into pulp i.e. the method of converting wood chips into paper pulp for use in papermaking accomplished by chemical cooking of the chips is called chemical pulping. This process can be, and generally is, used as an alternative to mechanical pulping, which involves.