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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Fibre cement – rooted in history

In an alternative process, the accumulator roll has a recess along its complete circumference, while the installation comprises a means to contact the fresh slab to the accumulator roll immediately after removal of the previous accumulated slab. The process comprises the steps of: This allowed the replacement of much of the cement with fine ground silica, which reacted at autoclave temperatures with the excess lime in the cement to produce calcium silica hydrates similar to the normal cement matrix.

CA CAA1 en The width of the sieve is the width W2 of the monolayer which will be formed on the sieve surface when the slurry is sucked from the outside of the sieve towards the inner side of the sieve.

This was not widely adopted except for siding products and wet-area lining sheets. They are stable against alkali attack under autoclave conditions. As an alternative set up shown in figure 7for the first rotating drum sieve in production directionat both ends in axial direction, a zone and of the sieve sprayed by a water spraying devicespraying water to the zones and According to a first aspect of the present invention, a Hatschek process for the production of profiled fiber cement plates is provided, the process comprising the steps of.

A flexible building material Immediately after it is formed fibre-cement is still pliable.

Optionally, at both sides andthe plate can be cut to the required total width as is usually done in Hatschek production, before curing. Installation for producing panel-shaped articles from a mixture of plaster and fibrous material. Asbestos fibers had several advantages. Reinforced cement sheet product containing no asbestos for fabricating on Hatschek machine. Also that that stacks of monolayers having mutually different widths may be used. Cement mix and method for producing reinforced building sheets from a cement mix.

A Hatschek process according to any one of the preceding claims, wherein said multilayered slab consists of 2 to 8 monolayers. This slabwhich is transported in production directionis contacted by the rotating accumulator roll The first was that some manufacturers realized that the curing cycle could be considerably reduced, and cost could be lowered, by autoclaving the products.

The same reference signs refer to the same, similar or analogous elements in the different figures. According to some hafschek, the multilayered slab may consist of 2 to 8 monolayers. The sieves are aligned one to the other in such a way that on the endless beltthe monolayer with the smallest width W1 is encompassed, or in this case covered, by the other monolayers, in this embodiment the other three monolayersand prcess, which have all a substantially identical width W2.

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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 11, wherein the slurry is removed by spraying water to the slurry to be removed.

Curing the uncured fiber cement plate to provide a profiled fiber cement plate with tapered of beveled edges may be done by e. If the density was lowered, the products became more workable for example they could be nailed but the rate of saturation and the total water absorption increased and the freeze thaw performance decreased. According to some embodiments, the at least one monolayer of a first type of monolayer may have a thickness different from the thickness of the at least one monolayer of a second type of monolayers.

Talk to Cembrit about what fibre cement can do for your project and join the long line of satisfied users of this exceptional building material! This website uses cookies to measure traffic and for optimization of content.

It means that with respect to the present invention, the only relevant components of the device are A and B.

WOA2 – Hatschek process – Google Patents

Thus, the scope of the expression “a device comprising means A and B” should not be limited to devices consisting only of components A and B. Two developments occurred around the middle of the last century that had high significance to hatsvhek replacements of asbestos based cement composites.

This felt, after having passed the fourth rotating sieve drumcarries a fiber cement multilayered slab Alternatively the monolayer first provided in production direction may be the layer with the maximum width, such as the at least one monolayer of the second type of monolayers, the second and subsequent layers may gradually have decreasing widths in transversal direction, and prcoess layer may be extended in transversal direction by all previously provided monolayers.

For example, fiber cement composites have been made by extrusion, injection molding, and filter press or flow-on machines. The independent and dependent claims set out particular and preferred features of the invention.

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The thicknesses of the monolayers are identical and are 0. On 5 positions, the density of the uncured, profiled fiber cement plate was measured. Position P3 is in the middle of the uncured, hatschke fiber cement plate in transversal direction.

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The process according to claim 12, characterized in that the stacking roller having a recess in the axial direction along the entire circumference of the upperthe process further comprises at the start of the stacked multilayer endless fiber cement plank at least one layer deposited on the profiled roll, so that the use of a multilayer endless fiber cement plank at least one layer of hatscyek contacts in the recess stacking said roller means.

If you click through, you agree to our use of cookies. It is an object of the present invention to provide a process for providing profiled hastchek cement plates, having tapered or beveled edges at at least two parallel sides of the plate, which has less deviation in density across the plate in transversal direction. EP EPB8 en P1 and P5 are at the tapered edges of the uncured, profiled fiber cement plate. A Hatschek process according to any one of the claims 1 to 9, wherein each of said monolayers is provided by accumulating fiber cement slurry on a rotating sieve drum and removing said accumulated fiber cement slurry from said rotating sieve drum as a monolayer, the width of said 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.

CN CNB en Thus, appearances of the phrases “in pfocess embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment, though they could.

Doping compensation mechanism for producing fiber cement products by wet process.

Fibre cement – Cembrit

For the first rotating drum sieve in production directionat both ends in axial direction, a zone and of the sieve is covered by a water impermeable coating, such as a paint.

The cross section of this uncured fiber cement gatschekas shown in figure 5has already a tapered of beveled proxess and at both sides and in production direction The uncured, profiled fiber cement plate is reduced to the commercial width at both sides of the beveled edge profile, is air dried and hence a profiled fiber cement plate is provided.

hatdchek A number of monolayers, in the embodiment shown in figure 1in total four, are created by four rotating sieve drums, ,