US1915510A

US1915510A - Apparatus for the manufacture of corrugated reenforced asbestos sheets or plates

Info

Publication number: US1915510A
Application number: US570206A
Authority: US
Inventors: Arentsen Arie Hermanus
Original assignee: Individual
Current assignee: Individual
Priority date: 1929-08-14
Filing date: 1931-10-21
Publication date: 1933-06-27
Anticipated expiration: 1950-06-27

Description

June 27, 1933. A. H. ARENTSEN 1,915,510

APPARATUS FOR THE MANUFACTURE OF CORRUGATED REENFORCED ASBESTOS SHEETS OR PLATES Original Filed Aug. 14, 1929 l J u iLJLIl'Il u u/ t k i Patented June 27, i933 UNITED STATES PATENT OFFICE ABE HEBMANUS ARENTSEN, OF AMSTERDAM, NETHERLANDS AIEPAR-ATUS roa 'rrm mnrnc'runn or conauea'rnn nnmvroncnn .asnnsros snnn'rs on. PLATES Original application filed August 14, 1929, Serial 1T0. 885,930, and in the Netherlands and Germany Iay 16, 1929. Divided and this application filed ioctober 21, 1931. Serial Ito/570,206.

Processes are known whereby both sides of an insertion of jute, cloth or wire are coated with a mixture of asbestos, zinc-oxide, cement and a solution of glue, and the sheets 5 thus obtained are freed from liquid substances by pressure and are then dried.

This process, however, has not proved a success in practice, because the composition of the mixture is, in consequence of the use of zinc-oxide and of the large quantity of asbestos much too expensive and also because the application of the mixture to the inserted material is difficult and very slow. Moreover it is very often the case that the inserted pointed out that the so-called circular sieve.

and joggling machines which are employed for the manufacture of the usual asbestos eement plates or sheets without insertions are absolutely unsuitable for the manufacture of such sheets or plates with iron wire insertions.

According to the present invention which 0 eliminates the above mentioned defects the cement and asbestos are mixed together with water in certain proportions with or without an admixture of colouring matter to a thick paste, which paste is applied to both sides of an iron wire netting or gauze. The netting orgauze is then passed centrally between one or more pairs of rollers arranged in. sequence,

whereby the paste is pressed through and around the meshes of the wire netting by 40 means of rollers spaced at a distance from one another, the excess water being then removed by means of one or more pairs of rollers, whereupon the continuous sheet of asbestos cement is rolled or pressed out to the desired thickness. After the termination ofthisprocess further layers of iron wire netting may be applied to both sides of the asbestos cement sheet as previously manufactured, these new layers of netting being again embedded in asbestos cement, whereupon the excess water is removed by pressing. The process may, if required, be repeated several times. Finally before-the asbestos cement sheetis quite dry' it may be passed between pairs of corrugated or fluted rollers, arranged in. point form, in

- such a manner that in the first instance two corrugations are formed in the middle of the sheet whereupon further corrugations are ler%th.

or the purpose of explaining the rocess according to the invention more clear y, reference is made to the attached drawing in which Fig. 1 is a diagrammatic viewshowing the operations for the manufacture of continuous asbestos cement sheet with a reen-' forcing iron wire netting insertion or insertions and Figs. 2 and 3 schematically illustrate the manufacturing process for corru;

gated plates or sheets.

The process consists in mixing together cement and asbestos, preferably asbestos of short fibres in a proportion say 7 1 with suflicient water to make a thick aste. If it is desired to produce coloure sheets or plates,.then the desired colouring matter is worked into and thoroughly mixed with this paste. This asbestos cement plate, which contains comparatively little water-is then applied to both sides of a continuous band or web of iron netting 2, this iron wire netting sheet is passed in its vertical position smoothly and centrally between two or more pairs of rolls 1 arranged one behind the other,

the rolls being arranged the same distance v from one another. The rolls 1 are vided with vertically projecting edges w ile the surfaces of the rolls are prefera 1y made of metal gauze, for the purpose of enabling the water to escape through the meshes of this gauze surface. The asbestos cement mass 3 is pressed by means of the rolls between,

through and around the meshes of the iron wire netting 2 and it consequently encloses the meshes completely. A second pair of rolls 4,,which is preferably designed and J constructed similarly to the pair of rolls 1,

forces the excess water out of the mass and at the same time rolls the continous asbestos cement sheet to the desired thickness. If it is required, several pairs of rollers 4 may be 5 provided.

If it is desired to manufacture continuous asbestos cement sheets with several insertions of iron wire netting, the iron wire netting bands 5 are applied again to both sides of 3 the asbestos cement band or sheet 7' already produced and these new insertions are again coated with asbestos cement paste 6. The continuous asbestos cement sheet 7 originally manufactured together with the iron wire netting sheets 5 applied to both its sides with their respective asbestos coatings 6 are then passed between one or more pairs of rollers 8.

For the purpose of forcing the water out of the outer coatings and also for the purpose of rolling the continuous sheet 9 to the colour.

If corrugated plates are required, then the continuous asbestos sheet 9 is before it is quite dry passed between pairs of fluted rolls 10 arranged in pointed form, in such a mannor, that in the first instance two corrugations are rolled into the middle of the continuous sheet, and thereafter other corrugations are rolled into the continuous sheet on either side of the previously formed corrugations and so on until the sheet is corrugated throughout its whole width. Finally the corrugated plates or sheets may be passed through between one or more pairs of fluted rolls so as to accentuate the shape of the corrugations.

When the continuous sheet 9 is clamped or held by the first pair of rolls 10 it is cut off to the desired length.

The continuous asbestos cement sheet or the corrugated asbestos cement plates may after they have been scored be bent to any angle,

while after the score has been filled the thickness of the sheet or plate, remains the same as it was before. The corrugations formed in the plate remain in it even after it has been cut off, as the wire netting acquires the corrugated shape imparted to the plate.

remains in a good condition because of its quick application.

The lateral edges of the continuous sheet stand accurately at right angles to the plane of the sheet. The sheet has therefore no water edges as inthe case with the hitherto known asbestos cement plates or wire insertion. The two sides of the sheet are perfectly smooth, as the mass is moulded by means of rolls and as no felt bedding is used in the manufacturing process.

It is self evident that the asbestos cementplates or sheets with iron wire netting can be used for numerous purposes, especially in such cases where the usual asbestos. cement plates without any wire reenforcement are useless because they do not possess sufficient carrying or tensile strength.

This application covers the apparatus for carrying out my novel process, which has been claimed in application No. 385,930, filed August 14, 1929, of which this is a division and which has become Patent 1,864,626.

I claim as my invention:

1. An apparatus for the manufacture of cprrugated plates comprising a set of hor1- zontally disposed rolls of uniform length adapted to support an uncorrugated plate throughout its entire width, a second set of rollers disposed above said supporting rollers, said second set of rollers being of a length less than that of the supporting rollers and being fluted and arranged in tapered formation and said first named set of rollers having fluted portions similarly arranged and oppositely disposed to said second named rollers, whereby corrugations are first formed in the center of the sheet and then other corrugations on either side of the middle to progressively corrugate the plate throughout its entire width.

2. An apparatus for the manufacture of corrugated asbestos plates reenforced with woven metal insertions, comprising a plurality of upper and lower rollers provided with corrugations, the upper rollers being of considerable less length than the lower rollers, and being arranged in staggered V- shaped formation, and means for forcing incompletely dried asbestos plates between the upper and lower rollers, the arrangement of .the upper rollers being such that the plates receive corrugations first in a section of the middle, and then receive corrugations in sections on each side of the middle until the whole plate is corrugated.

. -In testimony whereof, I afiix my signature.

ARIE HERMANUS ARENTSEN.