NZ251000A - Wet process board manufacture characterised in that binder is added to the fibrous material prior to dewatering and pressing - Google Patents
Wet process board manufacture characterised in that binder is added to the fibrous material prior to dewatering and pressingInfo
- Publication number
- NZ251000A NZ251000A NZ251000A NZ25100093A NZ251000A NZ 251000 A NZ251000 A NZ 251000A NZ 251000 A NZ251000 A NZ 251000A NZ 25100093 A NZ25100093 A NZ 25100093A NZ 251000 A NZ251000 A NZ 251000A
- Authority
- NZ
- New Zealand
- Prior art keywords
- binder
- fibres
- stock
- added
- resin
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 48
- 239000011230 binding agent Substances 0.000 title claims abstract description 42
- 238000003825 pressing Methods 0.000 title claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 title claims description 3
- 239000002657 fibrous material Substances 0.000 title 1
- 230000020477 pH reduction Effects 0.000 claims abstract description 13
- 238000002360 preparation method Methods 0.000 claims abstract description 11
- 239000002994 raw material Substances 0.000 claims abstract description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 17
- 229920005989 resin Polymers 0.000 claims description 15
- 239000011347 resin Substances 0.000 claims description 15
- 239000000835 fiber Substances 0.000 claims description 14
- 229940037003 alum Drugs 0.000 claims description 6
- 230000035515 penetration Effects 0.000 claims description 6
- 229920001568 phenolic resin Polymers 0.000 claims description 6
- 239000005011 phenolic resin Substances 0.000 claims description 6
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 5
- 239000002253 acid Substances 0.000 claims description 5
- 239000011159 matrix material Substances 0.000 claims description 5
- 230000008961 swelling Effects 0.000 claims description 5
- 238000010521 absorption reaction Methods 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims 1
- 239000003232 water-soluble binding agent Substances 0.000 abstract description 3
- 210000000038 chest Anatomy 0.000 description 12
- 239000012895 dilution Substances 0.000 description 5
- 238000010790 dilution Methods 0.000 description 5
- 239000000463 material Substances 0.000 description 4
- 238000001556 precipitation Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- 239000007787 solid Substances 0.000 description 2
- 241001498426 Indigofera sessilfolia Species 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 229920003180 amino resin Polymers 0.000 description 1
- 238000010009 beating Methods 0.000 description 1
- 239000006227 byproduct Substances 0.000 description 1
- 150000001720 carbohydrates Chemical class 0.000 description 1
- 239000007795 chemical reaction product Substances 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000003311 flocculating effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 239000013505 freshwater Substances 0.000 description 1
- 239000003292 glue Substances 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000001376 precipitating effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 150000004760 silicates Chemical class 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21B—FIBROUS RAW MATERIALS OR THEIR MECHANICAL TREATMENT
- D21B1/00—Fibrous raw materials or their mechanical treatment
- D21B1/04—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres
- D21B1/12—Fibrous raw materials or their mechanical treatment by dividing raw materials into small particles, e.g. fibres by wet methods, by the use of steam
- D21B1/14—Disintegrating in mills
- D21B1/16—Disintegrating in mills in the presence of chemical agents
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/20—Macromolecular organic compounds
- D21H17/33—Synthetic macromolecular compounds
- D21H17/46—Synthetic macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- D21H17/47—Condensation polymers of aldehydes or ketones
- D21H17/48—Condensation polymers of aldehydes or ketones with phenols
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H17/00—Non-fibrous material added to the pulp, characterised by its constitution; Paper-impregnating material characterised by its constitution
- D21H17/63—Inorganic compounds
- D21H17/66—Salts, e.g. alums
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H23/00—Processes or apparatus for adding material to the pulp or to the paper
- D21H23/02—Processes or apparatus for adding material to the pulp or to the paper characterised by the manner in which substances are added
- D21H23/04—Addition to the pulp; After-treatment of added substances in the pulp
- D21H23/06—Controlling the addition
- D21H23/14—Controlling the addition by selecting point of addition or time of contact between components
- D21H23/16—Addition before or during pulp beating or refining
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- General Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Mechanical Engineering (AREA)
- Inorganic Chemistry (AREA)
- Paper (AREA)
- Dry Formation Of Fiberboard And The Like (AREA)
- Laminated Bodies (AREA)
- Diaphragms For Electromechanical Transducers (AREA)
- Cell Separators (AREA)
- Battery Electrode And Active Subsutance (AREA)
- Machines For Manufacturing Corrugated Board In Mechanical Paper-Making Processes (AREA)
- Crystals, And After-Treatments Of Crystals (AREA)
Abstract
In a process for making board according to the wet method, a stock is prepared from fibres produced from a fibrous raw material, and a binder is added prior to dewatering and pressing. The process is distinguished by adding the binder to the fibres before the preparation of the stock. The binder may be a water-soluble binder which is precipitated and fixed to the fibres by acidification. Acidification may take place in connection with the preparation of the stock or prior thereto as well as prior to the addition of the binder. The binder can be added to the fibres in the blow line from the defibrator for producing the fibres from the fibrous raw material, or it may be added to the fibres before the defibrator.
Description
New Zealand Paient Spedficaiion for Paient Number £51 000 New Zealand No. International No. 10 00 251000 PCT/SE93/0 0205 TO BE ENTERED AFTER ACCEPTANCE AND PUBUCATION Priority dates: ' —>1 3^*2.
International filing date: Classification: T l /oo, 3>a\ V\Q3/>4- Pubiication date: 2 6 NOV 1996 Journal No.: iq-IO NO DRAWINGS NEW ZEALAND PATENTS ACT 1953 COMPLETE SPECIFICATION Title of invention: Process for making board Name, address and nationalitv- of applicant(s) as in international application form: s"100 61 stockholm Sweden 0 0 1 PROCESS FOR MAKING BOARD The present invention relates to a process for making board according to what is commonly referred to as the wet method. More specifically, the invention concerns an 5 improved process for making board, by adding the binder at an early stage of the process. Insulation board, building board and hardboard, for instance, can be produced by this process.
When making board according to the wet method, a 10 stock is prepared from fibres produced from a fibrous raw material, such as chips and sawdust, by mixing the fibres with water in several steps. A binder is added to bind the fibres in the board, whereupon the stock is dewatered and the fibre pulp is pressed. The binder is added to the 15 stock and, if water-soluble, is precipitated and fixed to the fibres by acidification of the stock, e.g. by alum or acid. The binder may be added at a site where the stock concentration is about 5-15%, e.g. in the level box, whereupon precipitation and fixation by acidification take 20 place where the stock concentration is about 2-3%, e.g. in the machine chest. Alternatively, both the addition of the binder and the precipitation thereof on to the fibres may take place in the machine chest.
This process has the disadvantage that the binder, 25 when precipitated, deposits not only on the fibres, but also on the remaining material in the stock. Apart from useful fibres, the stock contains fibre fragments, i.e. what is commonly referred to as fines, as well as dissolved carbohydrate material and, to a certain extent, ligneous 30 substance in dissolved and colloidal form. Since the water in the process is at least partly recycled by using, in the preparation of the stock, the white water from the dewater-ing step, the contents of these by-products will be comparatively high. As a portion of the binder deposits on 35 these components, this portion will be of no avail to the fibre matrix. It has thus become necessary to increase the amount of binder added, which nevertheless 'has not given the desired result in certain cases. The dosage of resin is N.i. PATEN'i i i 16 OCT 1996 RECEIVED 251000 2 L also restricted by the fact that dewater.ing of the stock is rendered more difficult if the amount of resin exceeds a certain level (about 6-8%). In addition, many board manufacturers in Europe have made their processes more or less 5 closed for environmental reasons (reduced discharge of COD-consuming materials to recipients). As a result, the contents of fines and dissolved substances in the white water have increased even further. However, the present invention largely obviates these disadvantages.
One object of the invention is, therefore, to utilize the adhesive on the fibre matrix more effectively in the making of board. Another object of the invention "is to enable dosage of the desired amount of resin on the fibres without affecting the subsequent dewatering.
As appears from the appended claims, the objects of the invention are achieved by a process for manufacture of board according to the wet method by preparation of a stock of fibres, wherein a binder selected from water soluble curing organic or inorganic binders is added to the fibres before preparation of said stock and said binder is precipitated and fixed to the fibres by acidification prior to dewatering said stock and pressing the fibres into a board. It has surprisingly been found that the binder can be utilized far more effectively if added to the fibres early in the process, before the supply of water for preparing the stock, resulting in 25 improved properties of the board. Also, it has become possible to add very large amounts of binder without adversely affecting the subsequent process.
In the process according to the invention, conventional equipment is used for making board according to the 30 wet method. Thus, the wood raw material is conducted, by preheating with steam, to a defibrat^or for disintegration. The resulting fibre pulp is conveyed'through a blow line to chests, where the stock is prepared. Fresh water and/or white water is added to the chests, resulting in a stock 3 5 having a content of about 5-15%. This stock is conducted to a refiner for final adjustment of the beating degree. From the refiner, the stock is conveyed to a machine_chest, where the final dilution with water/white water is per- 2 5 10 0 0 3 formed. At this stage, the stock has a content of about 2-3%. This stock is conducted to a wet machine to be dewater-ed, pressed and dried/press-dried (hot press).
In the process according to the invention, the binder 5 may be added to the fibres at any time before the site where a substantial amount of water is added for preparing the stock. The binder is suitably added in the blow line from the defibrator. Here, the fibres have a dry solids content of about 40-60% by weight. This constitutes a 10 preferred embodiment of the invention. The binder may also be added to the fibres before the defibrator.
In the inventive process, use is made of such binders as are predominant in the art. These are curing organic or inorganic binders, such as phenolic resins, amino resins, 15 silicates or mixtures thereof. Water-soluble binders are generally used. When water-soluble resins are employed, they have to be precipitated and fixed to the fibres, which is brought about by acidification, e.g. by means of alum or acid. Preferably, acidification is performed in 20 connection with the preparation of the stock or prior thereto, and in that case also prior to the addition of the binder, when added in connection with the preparation of the stock, the precipitating reagent may be added to the first dilution chest, where the stock concentration is 25 about 1-15% by weight, usually 5-15% by weight. If acidification is allowed to take place at a late stage of the process, e.g. in the machine chest, there is a risk that some of the water-soluble binder applied to the fibre matrix is dissolved and instead precipitated on the other 30 material in the stock, resulting in impaired performance.
With the present invention, it is also possible to "control" the penetration of resin into the fibre. As a result, the properties of the board can be influenced in different directions, e.g. internal bond strength and 35 modulus of rupture versus swelling and water absorption. If a sparingly soluble or concentrated resin is used, penetration is reduced and the resin is concentrated on the fibre surfaces. This enhances the possibility of obtaining 25100 WO 93/18227 PCT/SE93/00205 4 active glue joints between the fibres, resulting in higher strength. In the opposite case, i.e. when diluted and low-viscosity resins are used, penetration increases, resulting in lower swelling and, above all, lower water absorption. 5 Penetration may also be reduced by adding alum/acid before the defibrator or before the site where the binder is added. Thus, the binder will be precipitated directly on the surface of the acid fibre, and penetration is reduced to a minimum. Consequently, the present invention enables 10 several ways of controlling in a given direction the properties of the end product.
Also, the process according to the invention enables the addition of very large amounts of binder without rendering dewatering on the wet machine more difficult. The 15 prior-art process restricts the dosage of the binder to about 6-8%, requiring at that the aid of certain flocculating chemicals. If the dosage exceeds this level, dewatering from the wire is impeded to such an extent that there is a risk of crushing the sheet in the press section. 20 In the process according to the invention, there are no dosing problems with contents of from about 0.5% by weight to about 40% by weight (based on dry resin on a dry fibre matrix), suitably up to about 15-20% by weight. Generally, the binder is used in an amount of about 0.5-10% by weight, 25 preferably 1-5% by weight.
Making board according to the wet method by the process according to the invention does not influence the other process conditions. The binder can be added through a simple connecting tube on the blow line after the defi-30 brator. The amount of binder is adjusted by a dosing pump. The binder can be precipitated in e.g. a first dilution chest at a stock concentration of about 10% by means of alum. Then, the sized stock is allowed to continue in the process via a refiner, a dilution chest, a machine chest 35 and a wet machine in conventional manner. Thus, the process according to the invention is fairly easy to incorporate in existing processes.
The invention will now be described in more detail 25100 T/SE93/0D2G5 PCT/S .15 with the aid of the following Examples, in which the part and percentage figures concern parts by weight and per cent by weight, unless otherwise stated.
Example 1 The making of insulation board.
Phenolic resin having a concentration of 40% by weight was applied by so-called blow-line dosage immediately after the defibrator through an insert pipe centered in the blow line. Thus, the phenolic resin was applied to concentrated hot fibre having a temperature of about 150°C (a dry solids content of about 50% by weight). The resin was dosed by a suitable dosing pump, and was precipitated and fixed to the fibre at a high stock concentration (8-10%) immediately after the cyclone in the first dilution chest.
Precipitation was brought about by the addition of an alum solution to the diluting water.
The sized fibre (the stock) was then conducted further in the proo -ss via refiners, machine chests and a wet machine in conventional manner.
The board thickness was 13 mm.
Dosing Phenolic resin MOR IB Swelling Water abs. process dosage % MPa MPa 2 h % 2 h % According to the invention 6.5 0.26 1.9 12.4 Added in machine chest typical values* 3.0- 0.08- 2.3-3.5 0.12 3.5 18-30 Standard board 2.7 0.11 7.0 173 *) An addition of wax forms part of this grade.
Claims (11)
1. A process for manufacture of board according to the wet method by preparation of a stock of fibres, wherein a binder selected from water soluble curing organic or inorganic binders is added to the fibres before preparation of said stock and said binder is precipitated and fixed to the fibres by acidification prior to dewatering said stock and pressing the fibres into a board.
2. A process as claimed in claim 1, characterised in that acidification takes place in connection with the preparation of the stock.
3. A process as claimed in claim 1. characterised in that acidification takes place before the preparation of the stock.
4. A process as claimed in claim 1, characterised in that acidification takes place before the addition of the binder.
5. A process as claimed in any one of claims 1-4, characterised in that acidification takes place with alum or acid.
6. A process as claimed in claim 1, characterised in that the binder is added to the fibres in the blow line from the defibrator for producing the fibres from the fibrous raw material.
7. . 7. a process as claimed in claim 1, characterised in that the binder is added to the fibres before the defibrator for producing the fibres from the fibrous raw material.
8. A process as claimed in claim 1', characterised in that the binder is a sparingly soluble or concentrated resin.
9. 9- a process as claimed in claim 1, characterised in that the binder is a diluted, low-viscosity resin.
10. A process as claimed in claim 1, charac- N.Z. PATENT OFFICE 16 OCT 1996 RECEIVED 25100 0 8 terised in that the binder is added in an amount of from 0.5% by weight to 40% by weight (based on dry resin on a dry fibre matrix).
11. A process according to claim 1 substantially as herein described or exemplified.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| SE9200784A SE470101B (en) | 1992-03-13 | 1992-03-13 | Procedure for making board |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NZ251000A true NZ251000A (en) | 1996-11-26 |
Family
ID=20385615
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NZ251000A NZ251000A (en) | 1992-03-13 | 1993-03-09 | Wet process board manufacture characterised in that binder is added to the fibrous material prior to dewatering and pressing |
Country Status (16)
| Country | Link |
|---|---|
| EP (1) | EP0663972B1 (en) |
| AT (1) | ATE144299T1 (en) |
| AU (1) | AU665817B2 (en) |
| CA (1) | CA2131525A1 (en) |
| DE (1) | DE69305529T2 (en) |
| EE (1) | EE9400251A (en) |
| ES (1) | ES2093417T3 (en) |
| FI (1) | FI96976C (en) |
| GR (1) | GR3021653T3 (en) |
| LT (1) | LT3163B (en) |
| LV (1) | LV10657B (en) |
| NO (1) | NO301944B1 (en) |
| NZ (1) | NZ251000A (en) |
| RU (1) | RU2080429C1 (en) |
| SE (1) | SE470101B (en) |
| WO (1) | WO1993018227A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1017549A1 (en) * | 1997-09-18 | 2000-07-12 | HÜTTENS-ALBERTUS CHEMISCHE WERKE GmbH | Method for producing moulded bodies, moulded body and installation for carrying out said method |
| US7368037B2 (en) | 2003-05-21 | 2008-05-06 | Masonite Corporation | Refiner steam separation system for reduction of dryer emissions |
| LT6163B (en) | 2013-10-15 | 2015-06-25 | Vilniaus Dailės Akademija | Plant fiber panels and their method of manufacture |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| LU55657A1 (en) | 1968-03-11 | 1969-10-02 | ||
| US3649396A (en) | 1970-01-22 | 1972-03-14 | Motala Verkstad Ab | Method of making rigid particle boards or the like |
| JPS56500968A (en) * | 1979-07-31 | 1981-07-16 | ||
| SE455001B (en) * | 1986-10-03 | 1988-06-13 | Rune Simonson | METHOD OF MANUFACTURING PRODUCTS CONTAINING FIBERS |
-
1992
- 1992-03-13 SE SE9200784A patent/SE470101B/en not_active IP Right Cessation
-
1993
- 1993-03-05 LT LTIP389A patent/LT3163B/en not_active IP Right Cessation
- 1993-03-09 RU RU9394040866A patent/RU2080429C1/en active
- 1993-03-09 EP EP93906930A patent/EP0663972B1/en not_active Expired - Lifetime
- 1993-03-09 AT AT93906930T patent/ATE144299T1/en not_active IP Right Cessation
- 1993-03-09 AU AU37715/93A patent/AU665817B2/en not_active Ceased
- 1993-03-09 WO PCT/SE1993/000205 patent/WO1993018227A1/en not_active Ceased
- 1993-03-09 CA CA002131525A patent/CA2131525A1/en not_active Abandoned
- 1993-03-09 DE DE69305529T patent/DE69305529T2/en not_active Expired - Fee Related
- 1993-03-09 ES ES93906930T patent/ES2093417T3/en not_active Expired - Lifetime
- 1993-03-09 NZ NZ251000A patent/NZ251000A/en unknown
- 1993-03-13 LV LVP-93-183A patent/LV10657B/en unknown
-
1994
- 1994-09-09 FI FI944158A patent/FI96976C/en active
- 1994-09-12 NO NO943379A patent/NO301944B1/en unknown
- 1994-11-17 EE EE9400251A patent/EE9400251A/en unknown
-
1996
- 1996-11-14 GR GR960403024T patent/GR3021653T3/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| NO301944B1 (en) | 1997-12-29 |
| NO943379L (en) | 1994-09-12 |
| GR3021653T3 (en) | 1997-02-28 |
| ES2093417T3 (en) | 1996-12-16 |
| ATE144299T1 (en) | 1996-11-15 |
| SE470101B (en) | 1993-11-08 |
| LT3163B (en) | 1995-02-27 |
| NO943379D0 (en) | 1994-09-12 |
| LTIP389A (en) | 1994-07-15 |
| DE69305529T2 (en) | 1997-02-20 |
| LV10657A (en) | 1995-04-20 |
| FI944158A0 (en) | 1994-09-09 |
| AU3771593A (en) | 1993-10-05 |
| EP0663972B1 (en) | 1996-10-16 |
| LV10657B (en) | 1995-10-20 |
| WO1993018227A1 (en) | 1993-09-16 |
| AU665817B2 (en) | 1996-01-18 |
| SE9200784L (en) | 1993-09-14 |
| EP0663972A1 (en) | 1995-07-26 |
| SE9200784D0 (en) | 1992-03-13 |
| RU94040866A (en) | 1996-07-10 |
| FI96976B (en) | 1996-06-14 |
| RU2080429C1 (en) | 1997-05-27 |
| CA2131525A1 (en) | 1993-09-16 |
| FI944158L (en) | 1994-09-09 |
| EE9400251A (en) | 1996-02-15 |
| FI96976C (en) | 1996-09-25 |
| DE69305529D1 (en) | 1996-11-21 |
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