US 4,052,492 AGranted

Method for producing preformed expansion joint fillers

AssigneeKaiser Gypsum Company, Inc.

InventorsMerle E. Kontny, Dorsey J. Morris

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Abstract

The method of impregnating substantial amounts of asphalt into fiberboard. Melted asphalt having desired properties for use with fiberboard is atomized and then chilled by passage through cold water sprays, and into a cellulose-fiber-containing slurry. The asphalt used has a high penetration at elevated temperatures and is atomized at a lower temperature than is ordinarily utilized in producing atomized asphalt. The slurry may then be pumped into a chest, stored therein, pumped into a deculator, and then to a head box and flowed on to the wire screen of a Fourdrinier machine, forming a wet mat. Or, the asphalt-containing slurry may be further asphalt-enriched by spraying atomized asphalt into it as previously, and then pumped into a chest enroute to a Fourdrinier machine. Water drains through the wire screen, and the mat then goes to the dryer. The slurry-handling and the board-forming steps are conventional.

Claims5

Dependent claims

In a method for producing preformed fiberboard expansion joint fillers wherein

1. asphalt is heated to a liquid state,
2. the liquid asphalt is sprayed through a first atomizing device to form a first atomized asphalt,
3. the first atomized asphalt is passed through a first spray of cooling water whereby said first atomized asphalt is chilled and formed into a first shower of solidified asphalt particles,
4. the shower of asphalt particles is incorporated into a cellulose-fiber-containing slurry in a first container to form an asphalt-and-cellulose-fiber-containing slurry,
5. the asphalt-and-cellulose-fiber-containing slurry is conducted to a wire screen and wet mat formed thereon, and
6. the wet mat dried then slit to form preformed fiberboard expansion joint fillers,
the improvement comprising:
a. using as the said asphalt in step (1), one having a penetration of at least 60 at 130.degree. F, and
b. carrying out said heating of the asphalt, in step (1), to about 350.degree. F.

6 more elements

Dependencies are inferred from the claim text.