US3988183A
Expired / Lapsed
US
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Variation of binder content in the core layer
Assignee: FAHRNI INSTITUTE Ltd
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Filing: 1970-11-10
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Granted: 1976-10-26
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Expires: 1990-11-10
Abstract
Abstract Particleboard, i.e., wood chip panels having greater transverse strength in that the core layer is characterized by having a central zone therein with a greater amount of binder on the chips in said central zone, based on the total weight of the wood chips in the respective zones, than on the chips in the intermediate zones adjacent the face zones of said core layer.
Inventors
- 👤 Siegfried Senn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:38
CPC Classifications
B; B27; B27N; B27N3/00; B27N3/08; B27N3/10; B27N3/14; B27N1/00; Y; Y10; Y10T; Y10T428/00; Y10T428/24; Y10T428/24942; Y10T428/26; Y10T428/29
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
231 words
Method for the production of single layer or multilayer panels which comprises preparing a core zone of wood chips mixed with a thermosetting binder, superimposing on both sides of said core zone intermediate zones of wood chips mixed with quantities of said binder, the amount of binder in said core zone being greater than the amount of binder in said intermediate zones based on the weight of said chips in the respective zones, and wherein outer core zones of wood chips and binder are superimposed along said intermediate zones, and wherein the amount of binder used in said outer core zones is less than the amount used in said intermediate zones based on the weight of the wood chips, the amount of binder, by weight, used in said core zone is about 4% to 8%, wherein the amount of binder used in said intermediate zones is about 3% to 7%, wherein the amount of binder used in said outer core zones is about 2% to 6%, and wherein the amount of binder in said core zone is always about 1% to 2% greater than the amount of binder in said intermediate zones, and wherein the amount of binder in said intermediate zones is always about 1% to 2% greater than the amount of binder in said outer core zones, and thereafter hot pressing said zones to produce a high quality panel.
Claim 2
Dependent Claim
231 words
Method for the production of single layer or multilayer panels which comprises preparing a core zone of wood chips mixed with a thermosetting binder, superimposing on both sides of said core zone intermediate zones of wood chips mixed with quantities of said binder, the amount of binder in said core zone being greater than the amount of binder in said intermediate zones based on the weight of said chips in the respective zones, and wherein outer core zones of wood chips and binder are superimposed along said intermediate zones, and wherein the amount of binder used in said outer core zones is less than the amount used in said intermediate zones based on the weight of the wood chips, the amount of binder, by weight, used in said core zone is about 4% to 8%, wherein the amount of binder used in said intermediate zones is about 3% to 7%, wherein the amount of binder used in said outer core zones is about 2% to 6%, and wherein the amount of binder in said core zone is always about 1% to 2% greater than the amount of binder in said intermediate zones, and wherein the amount of binder in said intermediate zones is always about 1% to 2% greater than the amount of binder in said outer core zones, and thereafter hot pressing said zones to produce a high quality panel.
Claim 3
Dependent Claim
37 words
Method as defined by claim 1 wherein adhesive coated top layer chips are uniformly spread out and applied to each outer zone of wood chips and binder and thereafter hot pressing to form a unitary consolidated board.
Claim 4
Dependent Claim
202 words
Process for the preparation of a multilayer wood chip panel of improved transverse tensile strength which comprises uniformly spreading a lower surface zone of chips and binder, then uniformly spreading a lower intermediate zone of chips and binder on said surface zone, then uniformly spreading a core zone of chips and binder on said lower intermediate zone, then uniformly spreading an upper intermediate zone of chips and binder on said core zone and then uniformly spreading an upper surface zone of chips and binder on said upper intermediate zone, using in said core zone wood chips having lengths of about 5 to 50 mm and mean thicknesses of about 0.4 to 0.7 mm and about 4% to 8% by weight of binder based on the wood chips, using in said intermediate zones wood chips having a mean thickness of about 0.2 mm and about 3% to 7% by weight of binder based on the wood chips, the amount of binder added to the core zone chips always being at least 1% greater than the amount of binder added to the intermediate zone chips, and thereafter pressing at a temperature of about 150° C at a pressure of about 15 kg/m 2 .
Claim 5
Dependent Claim
202 words
Process for the preparation of a multilayer wood chip panel of improved transverse tensile strength which comprises uniformly spreading a lower surface zone of chips and binder, then uniformly spreading a lower intermediate zone of chips and binder on said surface zone, then uniformly spreading a core zone of chips and binder on said lower intermediate zone, then uniformly spreading an upper intermediate zone of chips and binder on said core zone and then uniformly spreading an upper surface zone of chips and binder on said upper intermediate zone, using in said core zone wood chips having lengths of about 5 to 50 mm and mean thicknesses of about 0.4 to 0.7 mm and about 4% to 8% by weight of binder based on the wood chips, using in said intermediate zones wood chips having a mean thickness of about 0.2 mm and about 3% to 7% by weight of binder based on the wood chips, the amount of binder added to the core zone chips always being at least 1% greater than the amount of binder added to the intermediate zone chips, and thereafter pressing at a temperature of about 150° C at a pressure of about 15 kg/m 2 .
Claim 6
Dependent Claim
33 words
Process as defined by claim 3 wherein the amount of binder added with said surface zone chips is 1% to 3% less than the amount of binder added to said intermediate zone chips.
Claim 7
Dependent Claim
33 words
Method as defined by claim 4 wherein an outer zone layer of wood chips and binder is uniformly spread out between each surface zone and said core zones to form five core zones.
Claim 8
Dependent Claim
46 words
Method as defined by claim 4 wherein an outer zone layer of wood chips and binder is uniformly spread out between each of said surface zones of chips and binder and said intermediate zones of chips and binder whereby to form a panel of seven zones.
Claim 9
Dependent Claim
89 words
Method for the production of a multilayer panel consisting of a core layer of five superimposed zones which comprises uniformly spreading a first zone of chips containing about 4% by weight of binder, superimposing a second zone of chips containing about 5% by weight of binder, superimposing a third core zone of chips containing about 6% by weight of binder, superimposing a fourth zone of chips containing about 5% by weight of binder, superimposing a fifth zone of chips containing about 4% by weight of binder and thereafter pressing.
Claim 10
Dependent Claim
89 words
Method for the production of a multilayer panel consisting of a core layer of five superimposed zones which comprises uniformly spreading a first zone of chips containing about 4% by weight of binder, superimposing a second zone of chips containing about 5% by weight of binder, superimposing a third core zone of chips containing about 6% by weight of binder, superimposing a fourth zone of chips containing about 5% by weight of binder, superimposing a fifth zone of chips containing about 4% by weight of binder and thereafter pressing.
Claim 11
Dependent Claim
26 words
Method as defined by claim 7 wherein said pressing is at a temperature of about 150° C at a pressure of about 15 kg/m 2 .
Claim 12
Dependent Claim
33 words
Method as defined by claim 8 wherein an adhesive coated surface layer of wood chips is spread out and bonded to said core layers forming the first zone and fifth zone of chips.
Claim 13
Dependent Claim
136 words
Method for the production of homogenous or nonhomogenous chipboards which comprises mixing core layer chips with a relatively small quantity of a thermosetting binder and mixing core zone chips with a greater amount of thermosetting binder with respect to the weight of the chips, forming a particle blank by spreading five core layers, the chips forming the core zone having more thermosetting binder thereon than the adjacent core layers, and adjacent core layers having more binder thereon than the outer layers of said core, the binder content applied to said core zone being approximately 6% by weight, approximately 5% of said intermediate core layer, and approximately 4% for said outer core layer, and thereafter hot pressing said blank to produce a chipboard having a higher binder concentration in its core zone than in the adjacent layers.
Claim 14
Dependent Claim
136 words
Method for the production of homogenous or nonhomogenous chipboards which comprises mixing core layer chips with a relatively small quantity of a thermosetting binder and mixing core zone chips with a greater amount of thermosetting binder with respect to the weight of the chips, forming a particle blank by spreading five core layers, the chips forming the core zone having more thermosetting binder thereon than the adjacent core layers, and adjacent core layers having more binder thereon than the outer layers of said core, the binder content applied to said core zone being approximately 6% by weight, approximately 5% of said intermediate core layer, and approximately 4% for said outer core layer, and thereafter hot pressing said blank to produce a chipboard having a higher binder concentration in its core zone than in the adjacent layers.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-10-26 | 1980-04-26 | 1980-10-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-10-26 | 1984-04-26 | 1984-10-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-10-26 | 1988-04-26 | 1988-10-26 | $7700.00 | Window Closed / Lapsed |