Tillamook Passage

Jean Le Maudit, Ou Le Fils Du Forcat by Joseph George Walter McGown original, such as a blemish or missing page, may be replicated in our edition. Language French; Illustrations note 88 Illustrations; Illustrations, black.

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In the present study, cellulase-free xylanases from fungi were specifically screened for deinking of ONP pulp. Among 16 cellulase-free xylanase producing isolates, strain DX identified as Aspergillus niger produced maximum xylanase The xylanase of A.

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Improvement up to The K m and V max for the xylanase of A. The following examples particularly illustrate typical compositions of the invention and their effectiveness in improving water repellency of paper articles derived is understood, of course, that the invention is not to be limited thereto. This material was generally made according-to the directions of the Kerr et al patent cited above.

In this-particular instance a red milo starch was phosphated as set out therein to produce a'starchmono phosphate having a bound phosphorus level of 0. After gelatinization the starch monophosphate was diluted with water to a 0. Various preparations of starch phosphate and rosin were blended together to give a number of desired-combinations.

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The above blends were then added to a percent bleached softwood sulfite percent bleached hardwood sulfate pulp mixture at numerous total size levels. The pulp mixture had previously been Jordaned to Canadian Standard Freeness. After addition to the pulp of the starch phosphate-rosin compositions,. The alum was metered intothe head box as a 0. Paper made from the starch phosphate-rosin treated pulp was then evaluated for its ink hold-out character.

Here, the treated paper in a one inch square piece was placed in a dish containing ink. The paper floated on the ink, and was observed for ink penetration. At the time when 50 percent of the surfaceof the paper was covered by ink, that, is the ink penetrated through the bottom of the paper to the visible top, the test was terminated and time measured at this point. Of course, the longer the time it takes for the ink to.

In this test a permanent blue-black water-based ink fluid was utilized having a pH of about 2. In order to test water repellency of the thus treated paper hand sheets, a water penetration test was employed. Essentially, this test involved-placing the treated paper on a plate acting as an electrode.

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A drop of water was then placed on the paper and then a second metal weight placed on top of the drop of water. The second metal acted as a second electrode. As soon as the water penetrated the paper, current begins to flow and at the time when a current of 5 milliamps is reached the test is terminated'Thetime it takes to reach this current level from the startup of the test is measured.

Again, the longer the above takes to occur the greater the water repellency of the treated hand sheet. Water Penetration the Mullen test. This should be contrasted to rosin size itself which 'ofttimes detrimentally affects paper dry strength though increasing water repellency. Fiber Weight Seconds Points 1. While the rosin-starch monophosphate combination was just asv effective as rosin alone in this test on a total dosage basis, combinations of other anionic starches and rosin were decidedly inferior to use of rosin alone at the same overall treatment levels. In addition to starch phosphate other starch derivativeswere alsotested in order to determine their effectiveness in increasing paper water repellency.

After addition of rosin and anionic starches, alumwas added at a level of 2. That is, hand sheets prepared from pulps solely' treated with starch monophosphates readily adsorbed water, as indicated by an. Thus, in effect, use of rosin and starch phosphates in increasing water repellency is one involving a synergistic rather than an additive result.

Again, compositions comprising rosin and anionic derivatives other than the anionic starch phosphates were decidedly inferior to rosin alone, in terms of imparting water repellency to paper articles. Also, it can be seen that unmodified starch utilized in combination with rosin was markedly less effective compared to like use of starch phosphate and rosin. After seconds, the water is poured out, the specimen removed and blotting paper placed upon it, and a roller passed over the blotting paper twice.

The weight of the specimen then is determined and the difference between that weight and the weight of the dry specimen is taken as a measure of the absorptiveness 'of the specimen. The Ink Flotation Test has already been described.

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The Thiocyanate Flotation Test, identified formally as TAPPI RC-2l3, involves placing 2-inch squares of sized paper specimens in a porcelain dish half full of a 6 percent solution of ammonium thiocyanate starch phosphate, with respect to the use separately of these two materials,is shown further by the results of the following Water Penetration Test results:. It will be noted that the use of the above materials in combination resulted in a test result of 62 seconds whereas the use of the additives separately resulted in a test result of 53 seconds.

It is evident that the combination of additives is superior to use of these additives separately. As is clearly evident from the results shown in the examples above, the compositions of the invention are extremely effective in rendering thus treated paper articles resistant to adsorption by water. It has been noted that they are particularly efficient in resisting adsorption of water-based inks of a relatively low pH level, say in the range of pH 2. In addition, the chemicals used in the present invention are not affected by other additives normally used in the paper processing operation.

Also, they demonstrate their effectiveness in treating pulps having somewhat varied pH ranges. While the invention has been described in connection with specific embodiments thereof, it will be understood that it is capable of further modification, and this application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice in the art to which the invention pertains and-as may be applied to the essential features hereinbefore set forth, and as fall within the scope of the invention.

What is claimed is: l. A method of producing a paper article having improved water repellency without adversely affecting other desired properties such as dry strength which comprises the steps of treating an aqueous suspension of cellulosic paper fibers comprising a paper pulp with a unitary composition comprising rosin and a starch phosphate whereby said additives are adsorbed upon said fibers, draining the suspended water therefrom to produce a matted product, and drying said matted product to yield said improved paper article being relatively impermeable to water and ink.

The method of claim 1 wherein said pulp prior to treatment has a pH ranging from about 4. The method of claim 2 whereby an aluminum salt is also added to said pulp to aid in affixing said additives to said fibers.

Pulp Ink 2

A method of producing a paper article having improved water repellency without adversely affecting other desired properties such as dry strength which comprises the steps of treating an aqueous suspension of cellulosic paper fibers comprising a paper pulp with a unitary composition comprising rosin and a starch phosphate product prepared by reacting starch with an inorganic phosphate salt, whereby said additives are adsorbed upon said fibers, draining the suspended water therefrom to produce a matted product, and drying said mattedproduct to yield said improved paper article being relatively impermeable to water and ink.

A paper article characterized as having improved impermeability to water as derived from the process of claim 1. A paper article characterized as having improved impermeability to water as derived from the process of claim 4. Treatment of a paper pulp suspension with a unitary composition of rosin and a starch phosphate whereby the resultant paper article is rendered relatively impermeable to water.

Francis et a1.


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Maher, both of Lagrange Park, Ill. Filed: July 23, Appl. Application Data Continuation-impart Of Ser. Because of, this, chemical pulps are much superior to mechanical and semi-mechanical pulps for fine paper making. The most generally used type of beater is that known as the Hollander. In some other instances, while water repellency is increased, conversely the flexibility of the paper product is decreased whereby it cannot be molded or shaped into the desired form.

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The starch reactant may be derivedfrom vegetable sources, such as, for example, corn, wheat, potato, tapioca, rice, sage, and. For example, a 0. When a single composition comprising the above discussed materials is added to the pulp, it is greatly preferred that the composition contain percent by weight of rosin and percent by weight of starch, each of the foregoing percentages being based ontotal weight of rosin and starch phosphate solids.

After addition to the pulp of the starch phosphate-rosin compositions, - teredinto the pulp slurry at the mixing chest of the pilot paper machine utilized in the instant work. In each case, the tested anionic starches after gelatinization were diluted to 0. Q tivity in increasing water repellency, but also actually tended to increase the dry strength of the paper'article compared to similar sheets made usingrosin as a sole additive.

In ferric chloride FeCl and noting the time required for the development of a red coloration. The Thiocyanate Flotation Test, identified formally as TAPPI RC-2l3, involves placing 2-inch squares of sized paper specimens in a porcelain dish half full of a 6 percent solution of ammonium thiocyanate starch phosphate, with respect to the use separately of these two materials,is shown further by the results of the following Water Penetration Test results: It will be noted that the use of the above materials in combination resulted in a test result of 62 seconds whereas the use of the additives separately resulted in a test result of 53 seconds.

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Order Now. Experience the Ultimate Texture with Pulp. Comparison of Thickness. Most Popular Questions What is the difference between the Pulp stocks? We have five different shades of Pulp available in varying thicknesses: Cream Pulp is light and warm in appearance, and available in 13pt, 20pt, or 2-ply 27pt thicknesses. What finishes and uses are the Pulp cards not suitable for? The Pulp cards are not suitable for: Additional coatings Spot UV, UV coating, laminate coating Bright colours Photographs If you have large areas of solid colour in your design — we would recommend ordering Letterpress output on the Pulp.

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