US1838969A - Paper manufacture - Google Patents

Description

mateobject which is to produce sized pa .er the Patented Dec. 29, 1931 UNITED STATES ,PATENT OFFICE :anwm surmzars'rnn m JOSEPH A. wananu, or wns'rnncox, manna, AfiSIGNOBS -'ro s n. WARREN comm, or nos'ron, mssacrrusnr'rs, a conrom'rrorr or M CH SETTS Ho Application fled April 7,

Our invention relatesto the manufacture of sized and filled paper. We emplo herein the words sized and sizing to efine a treatment of paper in its manufacture which ,5 renders an 0t erwise bibulous paper web relatively resistant to absorption of liquid,

such as writing ink.

Furthermore our invention has for its object the employment as filling material for alkaline compounds of alkaline eart metals, of which calcium carbonate is an example; and which, if introduced into paper material-in the beater with-the usual rosin size, so acts as to defeat the ultian acceptable filled and sized paper. Heretoforeit has been found impracticable to employ any of the said compounds as filler materials for sized paper; our invention herein described is characterized by the association with such material as calcium carbonate and the other ingredients of a batch of paper of a corrective or protective material which will enable the paper to be properly filled with the comgs minuted solid material and at the same time adequately and acceptably sized. a Inthe specification which follows, twoexamples of preparation and manipulation of characteristic'materials are given in detail. Since precipitated calcium carbonate in available to many aper manufacturers that material is sel for the illustrations.

-Exmm No. l

sizing material and pro 85 7 Preparation 0- tect'i've em by weight) Mix 1500 parts rosin with-225 arts sodium 40 carbonate in sufficient water to acilitateagitation and cook this with live steam until all of the carbon dioxide has'been driven oif. To this add 900 parts melted araflin and, preferably, 100 parts sodium silicate, (the sodium silicate is not indispensable but it has been 1 ;found to assist in the production of emulsion) Stir the mixture thoroughly and then run it through a colloid mill, or otherwise treat it to produce thorough emulsion of the (parts and proportion;

rum murac'runn 1928. Serial at. 288,367,

Preparation of lime mud (01100,)

Take a wet lime mud containing 200 arts of ()aCO and about the same (plantity o water and add to-this as much- 0 the above de scribed emulsion as will contain 1% (parts 'parafiin and after mixing thoroughly ad also 3.75 parts of alum in water solution. For

alum there may be substituted that quantity of aluminum hydrate as would be produced by converting the 3% parts of alum to hydrate. pebble mill, or otherwise agitate.

In the beater provide a batch containing parts fibre (for instance half sulfite fibre and half soda fibre) with the usually proportionate quantity of water. To this add an ordinary rosin sizecmulsion in quantity to pro-- vide A part rosin, then add part alum. The foregoing materials having been thoroughly worked and mixed in the beater, add the lime mud preparation above described in such quantity as to supply 30 parts of (laCO This filler material as prepared should be added in the wet state; if it has been allowed to dry the water-repellent characteristic of the UaCO, would render it extremely difiicult to rewet and mix the material in the beater. When-the above described filler material has been duly distributed and mixed the form. f waste lime mud is yimmediamly in' the'beater, add a solution containing 3 parts of alum as convenient before the batch of paper stufi is ready to be run out on the paper ma 0.

' Exams: No. 2

' Preparation of rosin size and parafi/n emxwlsion as prescribed for Example A o. 1

Start the beater batch as before with 50 parts of fibre and then put in a quantity of wet lime mud equivalent to 30 parts dry CaCO. and at the same time a sufiicient quantity, of the rosin size and paraflin emulsion to provide one part of parafiin. When these materials have been thoroughly mixed by the beater action, then add 6 parts alum, insolution, before the batch is run on the paper machine.

The parafiin emulsion in either of the illustrative examples above recited forms a pro- Grind this mixture for a time in a y tective barrier around or over the otherwise detrimental CaCO particles to such an extent that they do not react as they otherwise would to prevent the production of a properly 5 and truly sized paper. The quantitative proportions of materials hereinabove given are such as we know to be effective; these proportions can doubtless be varied and constituent quantities diminished in the interest of 1 economy without defeating the main object.

We claim: a

1. Method of manufacturing filled and sized paper, characterized by the employment as a filler of an alkaline compound of an alkaline earth metal in association with emulsified parafiin and rosin as a size.

2. Method of manufacturing filled and sized paper, characterized by the employment as a filler or calcium carbonate in association with emulsified parafiin and rosin as a size.

3. Method of manufacturing filled and sized paper, characterized by the employment as a filler of an alkaline compound of an alkaline earth metal associated with emulsified paraflin and rosin as a size, and the addition of alum as a final step in the beater.

4. Method of manufacturing filled and sized paper, characterized by employment as a filler of calcium carbonate in association with emulsified parafin and rosin as a size, and the addition of alum as a final step in the beater.

5. Sized papercontaining as a filler an alkaline compound of an alkaline earth metal, associated with parafiin and rosin as a size.

6. Sized paper containing as a'filler calcium carbonate, associated with parafiin and rosin as a size.

40 Signed by us at Westbrook, Maine, this fifth clay of April, 1928.

EDWIN SUTERMEISTER. JOSEPH A. WARREN.