US1050164A - Paper and pasteboard machine. - Google Patents

Description

N. PEDERSEN.

PAPER AND PASTEBOARD MACHINE.

-APPLIGATION TILED MAY 6, 1911.

Patented m. M, 1913.

5 midi v aag ll olicution filed To (/Z] 'w/am/i mug, con-c Be it known that such will enableothers skilled in the o which it appertalns to make use i hine calied the pr. generally cons sts of press-rolls zi et paper, from first part c. i ne, isjirans 5e ed with n woolen felt which passes with th nsper between each pair of press rolls.

6 The invention consists in heating the 1121;) or paper after it has passed 'eaiween he first two pairs of press rolls and before it reaches the last pair of rolis, the eating bcin effected preferably by passing tue sheet over a drying cylinder. This heat 1 reduces the viscosity of the water contnined in the slices so that the action of the his pair of press rolls is greatly enhanced, ant the amount of steam necessary for the subsequent drying operation is greatly re duced owing to the fact that the sheet on entering the drier has a much lower content of "water than when it; is not subjected to the preliminary heating.

In 'the accompanying drawing, I have illustrated diagrammatically the second or press-part, andthe third part or drier of a paper machine.

In said drawing 1, indicates the Web or sheet or" soft Wet paper, 2, 2, the first two sets of press-rolls from which the Web passes onto the first drying cylinder 3 of the series of cylinders which constitute the drier or third part of the paper machine. The rela- Sseci cation of Letters Patent.

the posiiion of the first cylinder 3 to the second and th'rd pairs of press-rolls, is such that the sheet is caused to pass almost entirely around said cylinder, thus insuring on efiectii'c heating of the sheet before it passes from the cylinder 3 and between the latter or third pair of press rolls 2 from which letter M. d sheet piss-es around the reincini q cylinders 3 of the drier usual.

it. will he rcadiiy seen that applicants method may be carried out Without any great alterations of the Well known forms (if paper machines.

She obg'ect of the invention could not be attained by substituting for one off the coid rolls, a heated roll or cylinder, because the time during which the sheet is passing be tween the press rolls too short to properly heat. the sheet. U

rapidly running paper machines 1 e heating could be expedited by heating the felt which runs with the sheet through iie press part of the machine.

I claim:

1. The method of. making paoer pulp and paper, which consists in heating a Wet sheet of pulp or paper, to reduce the viscosity of the Water therein and thereby facilitate the expulsion of the Water therz from, and passing the heated sheet through the last Wet press or presses.

2. The met-hodiof making paper pulp and paper, which consists in heating a Wet sheet of pulp or paper, to reduce the viscosity of the Water therein and thereby facilitate the expulsion of the water therefrom, passing the heated sheet through the last wet press or presses and finally drying the heated pressed sheet.

3. The method of making paper pulp and thick paper, which consists in heatinge Wet sheet of pulp or paper by passing it over a drying cylinder, to reduce the viscosity of the water in the sheet and thereby facilitate the expulsion of the water from the latter, and passing the heated sheet through the last vc-t press or presses.

4. The method of making paper pulp and thick paper, which consists in hcatin a wet sheet of pulp or paper, by passing 1t over Q oeoiee e firying cylinder, to re&uce the viscosity as my invention, I have signed my nenne in of the1 Water in the fshelet and tlyareby lfecihpresence of two subscribing Witnesses. tete t e expu sion 0 t. e water roni t as latfer, passing the heated sheet through the NILE PEDERSEN' 5 last Wet press or presses and finally drying the heated pressed sheet.

In testimony that I claim the foregoing Witnesses AUG. ULSEN, HENRY BORDEN RICH.

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