US1695448A - Paper-making machine - Google Patents

Description

Dec. 18, 1928. 1,695,448 L. M. YOERG PAPER MAKING MACHINE Filed March 21, 1927 INVENTOR.

ATTORNEYS.

Patented Dec. 18, 1928.

WEUNITED STATES PATENT OFFICE.

LEON M. YOERG, 01*" HOLYOKE, MASSACHUSETTS, ASSIGNOR, .IBY MESNE ASSIGN- MEN TS, T0 AMERICAN WRITING PAPER COMPANY, INCORPORATED, 0F HOLYOKE, MASSACHUSETTS, A CORPORATION OF DELAWARE.

PAPER-MAKING MACHINE.

Application filed March 21, 1927. Serial No. 177,049.

This invention relates to improvements in the manufacture of paper on Fourdrinier paper making machines and is more particularly an improvement in the method and apparatus for producing a web of paper having a substantially thin portion or zone as compared with the rest of the sheet or web. A Patent No. 1,208,000, granted to E. L. Pope on'December 12, 1916, discloses an apparatus and method for producing paper having a thinned portion or zone to adapt the paper for use in loose leaf lodgers and the like so that the portion near the bound edges of same are more pliant and more readily adapted for bending when bound in the ledger. Paper made according to the above mentioned patent has an unattractive finished appearance because of the sharp contrast ot the thinned portion with respect to the rest of the paper and also to noticeable defects which are liable to occur in the thinned portion, which defects are necessarily the result of the operation of the par ticular means disclosed in the Pope patent.

One object of my invention is'therefore to provide an improved method and apparatus which will improve the appearance of paper made according to the Pope patent.

Another object is to break up the contrast between the thinned portion and the rest of the web so that such defects as are caused by an uneven distribution of the pulp in the thinned portion are not noticeable.

in general, Popes manner of forming the thin stripe in the web of paper consists in first applying fluid pressure v to the pulp shortly after it has been distributed upon the Fourdrinier wire screen cloth and then in providing means which attempt to keep the thinned strip or groove formed by'the' fluid fipressure free from any pulp which might 3;; flow back into the groove while the pulp is in flowable condition. Finally, a roll engages ,g with the remainder of the web which is quite *Doticeable in the finished sheet. Inpracticc it has been found that the means to keep the thinned strip entirely free from additional pulp does not efiiciently prevent pulp from flowing back into the groove so that as a matter of fact in the finished paper the thinned portion shows defects caused by this flow back of pulp. These defects area-ll the more noticeable by reason of being in the well defined portion of the thinner material.

According to my invention, I overcome these objections by employing, in combination with the means for reducing the thickness of the material, a new and novel arrangement of mechanism which acts on the thinned out portion of the paper web to produce a lined appearance. Instead of the well defined thin stripe in the web of finished paper, the thinned portion produced by my 1nvention consists of narrow lines having the appearance of alternate thin and slightly thicker portions in the thinned strip. These lines relieve the sharp contrast of the thinned strip with the rest of the paper and present a more pleasing appearancewithout destroying any of-the bending qualities of the stripe; and at the same time, any defects caused by the pulp flowing back into the thinned part are not so noticeable in the thinned portion as is the case with Popes method.

I will now describe my invention in conne'ction with the accompanying drawings which show a portion of theapparatus referred to in the Pope patent, only so much of Popes machine being shown as relates to my invention.

In the drawings:

Fig. 1 is a plan view of a part of a Fourdrinier paper machine;

Fig. 2 is a longitudinal sectional elevational view on line 2- 2 of Fig. 1; and

Fig. 3 is a much enlarged horizontal sectional view through one of the rolls 8 taken along the line 3-3 of Fig. 2 and showing the grooved screened periphery thereof.

Referring to the drawings, 1 represents the side frame of a Fourdrinier machine which carries the usual endless Fourdrinier wire screen or apron 2 supported upon suitable rolls such as 3. The frame 1 may take the of a portion thereof by the fluid pressurev means well disclosed inthe above mentioned Patent No. 1,208,000. This operation takes place at the flow end of the machine and means 20 shown in said patent are provided which attempt to keep the pulp from flowing back onto these thin stripes or grooves.

As disclosed in the Pope patent, means are provided in the form of a wire roll or screen device to smooth out this groove and to give it an even and uniform appearance in the finished product; but as distinguished therefrom, according to my invention I employ means whereby the portions 7 of reduced thickness are acted upon in such a manner that there'is formed therein narrow alternate portions or lines having the appearance of thin and thicker material and at the same time these narrow portions are also acted upon so that they will have an even and uniform appearance.

In order to accomplish this feature, I provide the rolls 8 with narrow circular grooves 10 formed on their periphery and cover the grooves 10 and the raised portions or ribs 9 therebetween with wire clothor the like indicated at 13 (best shown in Fig. 3) for engaging or hearing on the thinned portions 7 formed in the pulp. These rolls are preferably carried by arms 11 which are pivoted so as to swing on suitable means such as collars 12 slidably and adjustably"mounted on the shaft 4 so that the rolls 8 may engage or bear on the portions 7 of reduced thickness of the Web. Thus it is seen that in engaging the portions 7 of pulp of reduced thickness, the rolls 8, by reason of the grooves 10 and projections 9, produce narrow lines to effect the appearance of alternate stripes of thin and thicker material in the strip itself. This is due, of course, to the variation in the density of the fibers in the web after being acted upon by the rolls 8 by reason of the variation of the pressure of the grooves 10 and projections 9 on the web.

' Where the machine is arranged to make one grade of paper, these rolls 8 may be dispensed with and in lieu thereof the dandy roll 14 may be provided with the strips of grooved wire cloth indicated at 15 to contact with or bear on the portions 7 of reduced thickness to produce the alternate narrow and thicker appearing portions therein.

By reason of the formation of these nar row alternate thin and thicker appearing lines, the strip of reduced thickness in the finished product is given a lined appearance which lessens or destroys the well defined effect that a strip of reduced thickness has in contrast with the rest ofthe sheet. Thus an improved and attractive appearance is imparted to the sheet of paper.

Furthermore, by my improved method and means the appearance of defects in the thinned strip caused by pulp flowing back into the groove is lessened by the lined appearance of my stripe as the lines will cause a covering or breaking up of the defects so that they will not be noticeable.

The invention may be practiced in various ways without departing from the scope of the invention, and I prefer to be limited (if at all) by the following claims rather than by the foregoing description.

What-I claim is: I

1. In the manufacture of paper on'a Fourdrinier machine, the method of making a thinned portion of a paper web which has the appearance of narrow alternate lines of thin and thicker material therein which consists in first reducing the thickness of a portion of a web of pulp on the Fourdriner wire to form said thinned portion and then press ing said thinned portion with means to produce said lined appearance.

2. In the manufacture of paper on a Fourdrinier machine, the method of making a thinned portion of a web of paperwhich has the appearance of narrow lines of alternate thin and thicker material therein, which consists in first reducing the thickness of the pulp on a Fourdrinier wire by fluid pressure means to form said thinned portion and then engaging said thinned portion on a Fourdrinier wire with a circularly grooved finishing roll to produce said lined appearance.

3. The combination in a Fourdrinier paper making machine of means to reduce the thiclc ness of the material on the Fourdrinier Wire longitudinally thereof, with means for engaging the material after the latter has been acted upon by said reducing means to produce an appearance of narrow lines of alternate thin and thicker material in said reduced portion of the material.

4. The combination in a Fourdrinier paper making machine having means to reduce the thickness of the material on the Fourdrinier wire along a longitudinal strip thereof with a grooved roll engaging the material aftcr the latter has been acted upon by said means to produce an appearance of alternate lines of thin and thicker material in said reduced strip.

5. The combination in a Fourdrinier paper making machine having fluid pressure means to reduce the thickness of the material on the Fourdrinier wire along a longi-- tudinal strip thereof, of a screened roll engaging the material after the latter has been acted upon by said means, said roll having alternate circular grooves and ridges around the periphery thereof to produce an appearance of alternate lines of thin and thicker material in said reduced strip.

6. In the manufacture of paper on a Fourdrinier machine, the method of making a thinned portion of a web of paper which has the appearance of alternate narrow stripes of relatively thick and thin material which consists in first reducing the thickness of the paper stock when in moist condition to form 10 In testimony whereof I have affixed my sig- 15 nature.

LEON M. YOERG.

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