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HATSCHEK PROCESS PDF

Process Making Fiber Cement old type and improvement. Asbestos fiber cement techhology about years ago, Ludwig Hatschek made the. Equipment Evolution. Hatschek Forming Machine process entire sheet machine output. > Worked on process improvements to provide +/-. 1/8” on all. Hatschek process for the production of fiber cement plates. [] NL-A discloses a method and appa- ratus for manufacturing fiber.

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We have over 80 years of experience of the use of fibre cement across the varied climates of Europe and beyond.

According to some embodiments, the multilayered slab further comprises n additional monolayersn being an integer of at least 1, the width of each of the n additional monolayers in transversal direction may be more than the first width, and wherein each of the n additional monolayers extending in transverse direction beyond the first monolayer. To provide a profiled shape, usually to provide tapered edges to the long sides of the plate, the excess of cured fiber cement is grinded or cut away.

According to some embodiments, each of the monolayers may be provided by accumulating fiber cement slurry on a rotating sieve drum and removing the accumulated fiber cement slurry from the rotating sieve drum as a monolayer, the width of the first type of monolayers in transverse direction being provided by removing the part of the accumulated fiber cement slurry from the sieve, which parts extends beyond the width to be provided.

A Hatschek process according to claim 4, wherein said n additional monolayers are monolayers of said second type of monolayers. According to some embodiments, the difference between the width W1 of the first type of monolayers in transverse direction and the width W2 of the second type of monolayers may be at least 40 mm.

The three other monolayers extend over the first monolayer over a width W3 being ,in this sample mm on both sides. This product is used primarily for roofing slates and corrugates.

Although the original Hatschek process a modified sieve cylinder paper making machine dominated the bulk of asbestos cement products made, other processes were also used to make specialty products, such as thick sheets say greater than about 10 mm which required about 30 films. EP EPA1 en The first monolayer has a width W1 of mm, the three subsequent monolayers have a with W2 of mm. This a fiber cement multilayered slab is accumulated on an accumulation roll with a maximum diameter Dmax of mm, and having a trapezoid-like recess of depth R of 2mm and a length L of the legs in axial direction of the drum of 15 mm.

EP EPA1 en It is understood that also alternative sequences, with the sieve drum positioned not in the first station but in one of the second, third or fourth position in the rotating drum sieve train can be used. According to some embodiments, the accumulator roll may have a recess in axial direction along its complete circumference, the process further comprising the use of a means to contact the at least one layer of the endless fiber cement multilayered slab to the accumulator roll in the recess at start of accumulation of the at least one layer of the endless fiber cement multilayered slab on a profiled accumulator roll.

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As the system may continue to rotate, this is de facto an endless fiber cement multilayered slab. Cementitious gypsum-containing binders and compositions and materials made therefrom.

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In a processes according to the invention, at least one of the sieves, e. It is usually but not always covered with thick organic coatings. Typically rectangular parallelepiped-shaped plates are formed. With transverse direction is meant the direction perpendicular to the production direction and perpendicular to the plate surface.

According to some embodiments, the multilayered slab further may comprise m additional monolayersthe m monolayers being monolayers of the first type of monolayers. Also that that stacks of monolayers having mutually different widths may be used.

A Hatschek process according to any one of the preceding claims, wherein said multilayered slab consists of 2 to 8 monolayers.

Light in weight it is easier to transport and work on site. Doping compensation mechanism for producing fiber cement products by wet process.

This product is air-cured, since PVA procesd are, in general, not autoclave stable. A method and a felt for forming fiber cement hatscheek with base fabric with parallel non- woven md yarns.

Alternatively rotating sieve drums with different the axial length of the rotating sieves may vary to provide the different monolayer widths. Cembrit Cemsix Cembrit B5.

Along a part of the surface of the rotating drum, the surface is provided with perforations, or is provided in a wire net materialforming a sieve. Alternatif Fiber Semen Technologies.

The Hatschek process of any one of the preceding claims, characterized in that the first type having a single layer of a thickness of at least a single monolayer of the second type different from the at least one monolayer thickness of. Fibre cement is not susceptible to mould or rot damage thereby exceeding the longevity of timber, it contains no metals so will not rust and decay like steel and has low thermal conductivity so will not distort in the prescence of heat like PVC.

A Hatschek process according to any one of the claims 1 to 12, wherein said accumulator roll having a recess in axial direction along its complete circumference, the process further comprising the use of a means to contact the at least one layer of said endless fiber cement multilayered slab to the accumulator roll in the recess at start of accumulation of the at least one layer of said endless fiber cement multilayered slab on a profiled accumulator roll.

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As such an uncured, profiled fiber cement plate is provided.

WOA2 – Hatschek process – Google Patents

Thus, appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment, though they could. Thick organic coatings are also expensive, proxess hydraulic presses are a high cost manufacture step.

According to some embodiments, the multilayered slab may consist of 2 to 8 monolayers. Each rotating drum rotates around its axis in the vat On 5 positions, the density of the uncured, profiled fiber cement plate was measured. A Hatschek process according to any one of the preceding claims, wherein said multilayered slab further comprises m additional monolayerssaid m monolayers being monolayers of said first type of monolayers.

WO2017001230A2 – Hatschek process – Google Patents

The thicknesses of the monolayers are identical and are haatschek. Providing an endless fiber cement multilayered slab stacking at least one monolayer of a first type having a first width and at least one monolayer of a second type of monolayers having a second width, the at least one monolayer of a second type of monolayers extending in transverse direction beyond the at least one monolayer of a first type of monolayer; Accumulating at least one layer of the endless fiber cement multilayered slab on a profiled accumulator roll having a procwss along at least part of procfss circumference whereby the at least first monolayer is provided within the recess; Removing the accumulated slab from the accumulator roll; and Curing the uncured fiber cement plate.

Optionally, at both sides andthe plate can be cut to the required total width as is usually done in Hatschek production, before curing.

The second development was to replace some of the asbestos reinforcing fibers with hatschem fibers from wood. It is understood that the strip of uncured fiber cement plate where the recess is not present, hence the hatzchek of the plate is not provided, will be cut.

Thereafter the second and further layers in production direction sequence may all be of the second type of monolayers with a width W2 and extending in transversal direction beyond the first layer. A1 Designated state s: According to some embodiments, the recess may have a depth of between 0. The present invention will be described with respect to particular embodiments.