US2103110A - Vertical drier - Google Patents

Description

Dec. 21, 1937. c. A. DICKHAUT ET Al. 2,103,110

VERTICAL DRIER Filed April 11, 1936 ATToRNEY5,

Patented Dec. 21, we?

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VERTICAL D R/KER Charles A. Dickhaut and Sterling w. Warner, New Brunswick, N. J., assignors to John Waldron Corporation, New Brunswick, N. 3., a corporation of New Jersey Application April 11, 1936, Seriai No. 13,878

8 Claims. (Cl. 3i-48) This invention relates to vertical driers for coated paper, textiles, and other web material. Coated paper is dried in various forms of driers such as festoon driers wherein paper is carried in festoons on sticks or in floating driers where the paper is. supported by air pressure or is dried when only coated on one side by drying drums. In many forms of coating such as in the case of varnishes, lacquers and emulsions, the coatings become tacky when partially dried and hence can only be coated on one side otherwise the web will adhere to the sticks. It, therefore, is necessary to coat one side anddry same, and then to coat the other side. As the 5 length of time required for oxidizing necessitates a rather slow speed a double coating materially increases the cost. Even where only one side is coated and dried at one time, the stick mark settings are sometimes discernible. Where attempts have been made to dry the web by suspension from one edge, the contraction of the web in drying is sufiiciently great to create wrinkles, marring of the coating and considerable wastage by breakage. Attempts to overcome this by releasing the gripping mechanisms and then regripping the web have not been enprovide a drier wherein paper or the like after 4 being coated may be dried on edge regardless of the'width of the paper.

A- still further object of the invention is to 40 provide a vertical drier wherein the web during drying may be relieved of the-strain set up by the contraction while at the same time the travelling web is maintained at the same level.

A stillfurther object of the invention is to provide a drier that is adapted to dry paper coated with any material economically and endciently whether coated on one side or both sides. Referring to the drawing:

Figure 1 is a plan view of a coating and drying device embodying the principles of our invention. i

Figure 2 is a detail view of the spiked wheel transfer means. Figure 3 is a detail view of a: modified form of transfer means.

Still another object of the invention is to,

In carrying out our invention, we propose to provide a chamber 1 within which any arrangement of dryingmedium may be used such as steam, hot air, etc. i

We have provided pipes 2 in Figure .1 for the drying medium. Doors 3 function to permit entry into the drying chamber and also as vents.

Chamber l contains a plurality of passes of a travelling carrier 4 wherein the web of paper It is carried by the usual gripper mechanisms secured to travelling carrier d. A carrier 5 oper ates from the unwind mechanism 1 around sprocket 6 where the web is automatically gripped and carried through chamber I around sprockets 8 and 9, andthence exteriorly of chamber 5 around sprockets it, H, 12 and i3, and thence back through chamber i and around sprocket 6. At sprocket H, the carrier 5 leaves the web It. The web it passes through vertical coater rolls l5 and is again picked up by carrier 5 adjacent sprocket it where it is carried by carrier 5 through chamber l for the initial drying. Any well known means are utilized for 'maintaining carrier 5 taut, such as a tension means between sprocket l2 and tension device iii. Carrier 5 is generally operated at a greater speed than carrier i. Carrier i is generally maintained at a constant speed. As carrier 5 is an independent carrier its speed can be varied with respect to the speed of carrier d. The carrier 5 maintains the coated web quite taut. This is partially due to the drying effect. We have found that the major part of the shrinkage of "the Web after coating and during drying will occur in the first pass, that is, while being borne by carrier 5. Therefore, if the tension of the web is relieved after the initial drying no further transfers are required. In addition, as the carrier t is travelling at a lesser speed than carrier 5, there will be sufficient looseness of theweb to permit the web to make the returns for the various passes of carrier i without the web tearing from the grippers or the grippers becoming opened.

After carrier cleaves chamber 5 with the coated web the web passes around spiked wheel ll where it is imbedded thereon bybrush wheel It.

In the modified form shown in Figure 3, the brush wheel in is replaced by a grooved wheel 23. Carrier A passing around sprocket wheel 22 has the grippers pick up web it from spiked wheels 51. The speed of carrier d 'being less than carrier 5, relieves the tension in web I t eliminating the strain and any wrinkles with the web sufficiently loose to permit reversal for the requirednumber out of chamber l to rewind mechanism l9. Carrier 4 leaves the web at sprocket 20 to again complete its cycle. Utilization of the transfer means shown prevents the slipping of the material )during the transfer operation and the maintenance of the material at the proper level. The maintenance of the edge of the web in the same horizontal plane with relief of tension occasioned by contraction on drying are vital elements in successfully drying coated paper and the like in the vertical plane. Furthermore, the paper must have a certain amount of moisturedriven off before the tension is relieved since certain papers when wet have very little strength and a release of the grippers with subsequent regripping while wet will tear the web. In our invention, the necessary amountof moisture is driven off prior to the regripping of the web.

Various modifications may be made and still fall within the scope of our invention. For instance, the unwind web mechanism may be placed "adjacent the coating mechanism and in such case continuous carrier having mechanisms for grip-1 there will be no preliminary drying. We preferably dry the web preliminary to coating so that there will be a better bonding eifect between the coating and the web and a more uniform weight of coated paper will be produced. Also variations in coating mechanisms may be utilized. Any well known type of gripping means or carrier chains may be used.

What we claim is:

1. Ina drier, a drying chamber, a plurality of carriers having mechanisms for gripping by one edge a vertical web of material and transporting the same through said chamber, means for transferring said web from one carrier to another, and means for operating said carriers at different speeds. e

2. In a drier, a drying chamber, a single pass ping by one edge a vertical web of material and transporting the same through said chamber, a second continuous carrier with a plurality of passes and having mechanisms for supporting by one edge a vertical web of material, said second carrier being motivated at a lesser speed than said first carrier, and means for transferring said web from said first carrier to said second carrier without slippage or breakage of said web.

' 3. In a drier, a drying chamber, means for carrying a web of material through said chamber for preliminary drying after treatment, means for carrying said web a plurality of passes through said chamber foradditional drying, and means for transferring said web from one carrying means to another, said transfer means including a pinwheel and cooperating mean'safor impaling the web on said pinwheel.

'4. In a drier, a drying chamber, means for carrying a web of material through said chamother.

. 2,103,110 of passes through chamber I. Web ll then passes ber fonpreliminary drying after treatmenhmeans for carrying said web a plurality of passes through said chamber for additional drying, said initial carrying means being motivated at a greater rate of speed than said additional carrying means, meansfor transferring said web from one carrying means to another, said transfer means comprising a pinwheel and a brush wheel for impaling said web on said pinwheel.

5. In a drier, a drying chamber, means for carrying a web of material through said chamber for preliminary drying after treatment, means for carrying said web a plurality of passes through said chamber for additional drying, said initial carrying means being motivated at a greater rate of speed than said additional carrying means, and means for transferring said web from one carrying means to another, said transfer means comprising a pinwheel and a grooved wheel cooperating therewith to impale said web on said pinwheel.

6. In a drier, a drying chamber, a web-treating mechanism, an unwind mechanism fora web of material, means for carrying said web in vertical position from said unwind mechanism through.

a plurality of passes through said drier, and

means for transferring said web from one carrying means to the other.

7. In a drier, a drying chamber, a web-treating mechanism, an unwind mechanism for a web of material, means for carrying said web of material in vertical position from said unwind mechanism through said drying chamber for preliminary drying to said web treating mechanism and thence again through said drying chamber fora'n initial drying of said treated web, additional means for carrying said treated web in vertical position at a slower speed a plurality of passes through said drier, and means for transferring said web from one carrying means to the other,

said transferring means comprising a pinwheel and an impaling wheel for impaling said web on tional means for carrying said web in vertical position and at a slower speed over a plurality of passes through said drier, and means for transferring said web from, one carrying means to the CHARLESADICKHAUT. STERLING WLWARNER.

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