US3629949A - Threading procedure - Google Patents

Threading procedure Download PDF

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Publication number
US3629949A
US3629949A US3629949DA US3629949A US 3629949 A US3629949 A US 3629949A US 3629949D A US3629949D A US 3629949DA US 3629949 A US3629949 A US 3629949A
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Prior art keywords
tail
pulp
belt
web
belts
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Harry Knelson
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Svenska Flaktfabriken AB
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Svenska Flaktfabriken AB
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    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21GCALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
    • D21G9/00Other accessories for paper-making machines
    • D21G9/0063Devices for threading a web tail through a paper-making machine
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06CFINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C7/00Heating or cooling textile fabrics
    • DTEXTILES; PAPER
    • D06TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06CFINISHING, DRESSING, TENTERING OR STRETCHING TEXTILE FABRICS
    • D06C2700/00Finishing or decoration of textile materials, except for bleaching, dyeing, printing, mercerising, washing or fulling
    • D06C2700/09Various apparatus for drying textiles

Abstract

Two contiguous conveyor belts for threading a pulp web tail through a dryer to avoid bunching and consequent tearing or cutting of the web tail by means of a paper tape such as those found on adding machines between the web and one belt. The paper tape allows relative slippage between one belt and the web tail so that the web does not have to try to conform with the local speed differences between the belts as they pass successively through direction reversing rolls.

Description

United States Patent [72] Inventor Harry Knelson Prince Rupert, Canada [21] Appl No. 866,350

[22] Filed [45] Patented [73] Assignee Oct. 14, 1969 Dec. 28, 1971 Aktiebolaget Svenska Flaktiabriken Stockholm, Sweden [32] Priority May 26, 1969 [33] Canada [54] THREADING PROCEDURE 3 Claims, 4 Drawing Figs.

52 05.01 34/23, 34/158 51 mac! F26b3/00 [50] Field of Search 34/23. 158

[56] References Cited UNITED STATES PATENTS 3,399,465 9/1968 Lanne et al. 34/158 Primary Examiner-Charles Sukalo Attorney-Howson and Howson ABSTRACT: Two contiguous conveyor belts for threading a pulp web tail through a dryer to avoid bunching and consequent tearing or cutting of the web tail by means of a paper tape such as those found on adding machines between the web and one belt. The paper tape allows relative slippage between one belt and the web tail so that the web does not have to try to conform with the local speed differences between the belts as they pass successively through direction reversing rolls.

PATENTEUnmzmsn 3,629,949

SHEET 2 BF 3 FULL WIDTH WEB 2 PATENTEI] UEE28 Ian SHEET 3 []F 3 THREADING PROCEDURE The invention relates to the problem of threading the leading edge of a web material such as cellulose pulp to and fro between two opposed series of rolls as found in dryers and pulp machinery of a similar nature.

Such a threading arrangement usually comprises a conveyor mounted at one side of the path through which the whole web will eventually pass; and the conveyor itself comprises two similar endless belts which pass together successively over one end of each roll. The start of the web is usually a long narrow strip at one edge which broadens out gradually to the full web width; this facilitates threading and is usually called the tail of the web or pulp.

This pulp tail is gripped between the two endless belts at the beginning of the path; these belts thread the tail through the roll path and release the tail at the end of the path, so that the tail pulls the full width web through the rolls after it.

Unfortunately, a serious disadvantage is that it is very difficult to get the two belts running at exactly the same speed; for example, as the two belts pass over successive rolls the inner slower belt adjacent one roll becomes the outer faster belt of the next roll displaced from it by the thickness of the other belt. This means that one belt must slide locally with respect to the other, and other factors may also contribute to and accentuate the speed difference between the two belts, as is well known to those skilled in the art.

The result of this speed difference depends upon the material of the pulp web. Some may disintegrate and in other cases when a pulp tail is gripped between two belts not running at precisely the same speed it can cause the tail to bunch" or fold onto itself so as to foreshorten the tail. When such a bunch passes over a roll the pressure applied on the pulp tail causes the tail to be cut at each fold. The effect is particularly damaging to hardwood pulp tails as the tensile strength of hardwood pulp is generally considerably less than that of softwood pulp.

A previous solution to the problem has been disclosed in U.S. Pat. No. 3,399,465 issued Sept. 3, 1968 and assigned to the assignee of the present application, disclosure of this patent being incorporated herein by reference. The problem was overcome by providing a single belt (or two belts joined at the edge) to obviate slipping; this required conveyor modification to fold the belt into two at the beginning so as to grip the tail and to unfold it at the end of the threading so as to release the pulp tail and to pass the belt back to the beginning.

I have found that the disadvantages of the prior art using two separate belts may be overcome by facing one belt with a strip of smooth material. In a preferred embodiment I feed a strip of strong smooth material in with the pulp tail. Although I do not wish to be bound by this explanation, I consider that what happens is that the smooth material allows one belt to slip while the other belt grips the pulp tail and threads it through the dryer. However, it may be that the predominant effect is one of reinforcement. Preferably this material is paper tape, the type used in adding machinesother suitable materials can be determined in ordinary trial and error experiment by those skilled in the art.

The invention may best be understood by reference to the drawings in which:

FIG. 1 is a sectional view showing conventional arrange-;

ments;

FIG. 2 is a vertical cross section through the same plant along the line A-A in FIG. 1, showing the treatment plant in normal operation;

FIG. 3 is the same vertical cross section as in FIG. 2 showing the treatment plant during the threading of the web material;

FIG. 4 shows an enlarged view of the pulp tail and the tape at initial entry between the two belts as in the preferred embodiment.

In FIG. 1, the treatment plant 2, in this case a dryer, is enclosed in housing 4, and the full width paper webwhen fully threaded enters the dryer at the left (although not in the plane of the section shown so as to avoid the threading arrangement 6) and passes over rollers 8, l0, 12 through 22 successively. It will be understood that the dryer extends at right angles to the plane of the paper and that the section of FIG. I is at one end of the rollers as is the box 6 for the threading arrangements, although slot 24 extends substantially along the length of and parallel to the axis of the rollers. The ducts for the drying medium 26 may extend as far as the plane of the threading arrangement at the end of the rollers but do not relate to the invention.

In the conventional threading operation the pulp tail 28 is gripped between two separate and independent belts 30 and 32 which come together after leaving their independent idler rollers 34, 36. The three layers (of belt 30, belt 32 and pulp tail 28) pass together under idler 38, over idlers 40 and 42 into the roll system (8 through 22) of the dryer as shown. As can be clearly seen afterpassing over roll 22, the belts separate to free the pulp tail, each belt being returned independently to the beginning. This is accomplished by a series of idlers 44 and tensioning weight 46 for belt 30 and idlers 50 and tensioning weight 48 for belt 32.

In FIG. 2 the plant is shown in normal operation. The spaces between the cross-hatched portions represent the ducts 26. In each deck a conveyor 58 is located to the side of the material web. This conveyor is not engaged in normal operation.

In FIG. 3 the plant is shown in the threading operation. The leading end 28 has been introduced into the conveyor 54 and is threaded by it through the rolls.

FIG. 4 illustrates the insertion of the tape in the instant invention which is shown as a spool 52 which is preferably of ordinary, readily available adding machine paper tape. This tape should, of course, be wide enough to substantially prevent any contact of the adjacent belt and the tail and I find that 4-inch wide paper tape is suitable.

The paper tape itself 54 is fed into the conveyor belt with the pulp tail and is started as soon as or somewhat ahead of the pulp tail. The paper tape feed is continued until the pulp tail leaves the dryer belts so as to ensure that proper threading has taken place.

The support 56 for the spool of paper tape may be located at any convenient place although I have shown it below the pulp tail 28 so that it can be conveniently mounted on the threading arrangement box 6 or the housing 4.

Thus, it will be seen that this invention enables a pulp tail to be threaded through a series of rolls with only a minor modification to prior art threading arrangements.

I claim: I. A method for threading a pulp web through a series of rolls comprising the steps of:

providing one conveyor belt with a normal facing and providing a second conveyor belt with a smooth facing,

gripping the web on a narrow edge portion between said two conveyor belts in face to face relationship of the normal and smooth facing,

passing the belts through the series of rolls, and

separating the belts so as to release the pump web narrow edge portion after passage through the series of rolls.

2. A method for threading a pulp web through a series of rolls comprising the steps of:

facing a first conveyor belt with a tape of strong smooth material,

juxtaposing a second conveyor belt in face to face relationship with said first conveyor belt with the tape vtherebetween,

gripping a pulp tail between the face of the second belt and the tape,

passing the two belts through the series of rolls, and

separating the belts so as to release the pulp tail after passage through the series of rolls.

3. A method of threading a pulp web through a series of rolls comprising the steps of:

facing a conveyor belt with a layer of paper tape,

juxtaposing a second conveyor belt in face to face relationship with said first conveyor belt with the paper tape therebetween,

gripping a pulp tail between the face of the second belt and the tape, passing the two belts through the series of rolls, and separating the belts so as to release the pulp tail after passage through the series of rolls. 5

i l i

Claims (2)

  1. 2. A method for threading a pulp web through a series of rolls comprising the steps of: facing a first conveyor belt with a tape of strong smooth material, juxtaposing a second conveyor belt in face to face relationship with said first conveyor belt with the tape therebetween, gripping a pulp tail between the face of the second belt and the tape, passing the two belts through the series of rolls, and separating the belts so as to release the pulp tail after passage through the series of rolls.
  2. 3. A method of threading a pulp web through a series of rolls comprising the steps of: facing a conveyor belt with a layer of paper tape, juxtaposing a second conveyor belt in face to face relationship with said first conveyor belt with the paper tape therebetween, gripping a pulp tail between the face of the second belt and the tape, passing the two belts through the series of rolls, and separating the belts so as to release the pulp tail after passage through the series of rolls.
US3629949D 1969-05-26 1969-10-14 Threading procedure Expired - Lifetime US3629949A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693405A (en) * 1985-02-07 1987-09-15 Ross Pulp And Paper Inc. Threading belt for pulp floater dryers
CN101788223A (en) * 2010-03-30 2010-07-28 陈品维 Mesh belt drying system device

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399465A (en) * 1967-01-16 1968-09-03 Svenska Flaektfabriken Ab Apparatus for threading a web material

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3399465A (en) * 1967-01-16 1968-09-03 Svenska Flaektfabriken Ab Apparatus for threading a web material

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4693405A (en) * 1985-02-07 1987-09-15 Ross Pulp And Paper Inc. Threading belt for pulp floater dryers
CN101788223A (en) * 2010-03-30 2010-07-28 陈品维 Mesh belt drying system device

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