Siloxane polymerization in gypsum wallboard
US-2020024191-A1 · Jan 23, 2020 · US
Method of Forming a Gypsum Panel Including a Starch Layer
US2021309571A1 · US · A1
| Field | Value |
|---|---|
| Publication number | US-2021309571-A1 |
| Application number | US-202117218911-A |
| Country | US |
| Kind code | A1 |
| Filing date | Mar 31, 2021 |
| Priority date | Apr 2, 2020 |
| Publication date | Oct 7, 2021 |
| Grant date | — |
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- Title
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- Abstract
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Abstract
Official abstract text for this publication.
In the present disclosure, a method of forming a gypsum panel is disclosed. The method comprises: providing a first facing material, forming a starch slurry by combining starch and water at a shear rate of 3,000 rpm or more, providing the starch slurry onto the first facing material, depositing a gypsum slurry comprising stucco and water onto the starch slurry on the first facing material, providing a second facing material on the gypsum slurry, and allowing the stucco to convert to calcium sulfate dihydrate.
First claim
Opening claim text (preview).
1 . A method of forming a gypsum panel, the method comprising: providing a first facing material, forming a starch slurry by combining starch and water at a shear rate of 3,000 rpm or more, providing the starch slurry onto the first facing material, depositing a gypsum slurry comprising stucco and water onto the starch slurry on the first facing material, providing a second facing material on the gypsum slurry, and allowing the stucco to convert to calcium sulfate dihydrate. 2 . The method of claim 1 , wherein the second facing material is directly on the gypsum slurry. 3 . The method of claim 1 , wherein the starch slurry is further provided on the gypsum slurry and the second facing material is provided on the starch slurry on the gypsum slurry. 4 . The method of claim 1 , wherein the starch slurry is further provided on the second facing material such that it is present at the interface with the gypsum slurry. 5 . The method of claim 1 , wherein the first facing material is a paper facing material and the second facing material is a paper facing material. 6 . The method of claim 1 , wherein the starch slurry covers at least 75% of the first facing material. 7 . The method of claim 1 , wherein the starch slurry includes starch in an amount of 50 wt. % or more based on the solids content of the starch slurry. 8 . The method of claim 1 , wherein the starch slurry further comprises gypsum. 9 . The method of claim 1 , wherein the starch slurry further comprises a conventional gypsum slurry additive. 10 . The method of claim 7 , wherein the gypsum to starch weight ratio is from 0.001 to 10. 11 . The method of claim 1 , wherein the starch slurry is provided to form a continuous starch layer. 12 . The method of claim 1 , wherein the shear rate is 4,000 rpm or more. 13 . The method of claim 1 , wherein the shear rate is 5,000 rpm or more. 14 . The method of claim 1 , wherein the gypsum slurry further comprises a starch. 15 . The method of claim 12 , wherein the starch is present in the gypsum slurry in an amount of 0.0001 wt. % to 10 wt. %. 16 . The method of claim 1 , wherein the facing material is present on the face of the gypsum panel in an amount of 80% or more as determined according to the humidified bond test at 2 hours. 17 . The method of claim 1 , wherein the facing material is present on the face of the gypsum panel in an amount of 80% or more as determined according to the humidified bond test at 20 hours. 18 . The method of claim 1 , wherein the panel has a weight of from 1,000 lbs/MSF to 4,000 lbs/MSF. 19 . The method of claim 1 , wherein the gypsum panel has a nail pull resistance of at least 77 lb f . 20 . A gypsum panel made according to the method of claim 1 .
Assignees
Inventors
Classifications
Nailable or sawable materials · CPC title
Gypsum-paper board like materials · CPC title
containing calcium sulfate cements {(gypsum-paper plates E04C)} · CPC title
- B28B19/0092Primary
to webs, sheets or the like, e.g. of paper, cardboard · CPC title
Polysaccharides, e.g. cellulose, or derivatives thereof · CPC title
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Frequently asked questions
Answers are generated from the same data shown on this page.
- What does patent US2021309571A1 cover?
- In the present disclosure, a method of forming a gypsum panel is disclosed. The method comprises: providing a first facing material, forming a starch slurry by combining starch and water at a shear rate of 3,000 rpm or more, providing the starch slurry onto the first facing material, depositing a gypsum slurry comprising stucco and water onto the starch slurry on the first facing material, prov…
- Who is the assignee on this patent?
- Gold Bond Building Products Llc
- What technology area does this patent fall under?
- Primary CPC classification B28B19/0092. Mapped technology areas include Operations & Transport.
- When was this patent published?
- Publication date Thu Oct 07 2021 00:00:00 GMT+0000 (Coordinated Universal Time) (A1). Legal status and post-grant events are not shown on this page.
- What related patents are in patentsdb?
- We list 4 related publications on this page (citations in our corpus or others sharing the same primary CPC).