Laminated beam MUF system 1249 / Light coloured system for laminated beam and finger joints in load bearing timber structures

Transcription

1 Casco Adhesives Market Support Product Information Laminated beam MUF system 1249 / One of the fastest MUF on the market - Flexible mixing ratio to fit different production needs Light coloured system for laminated beam and finger joints in load bearing timber structures Product Specification Product MUF adhesive Hardener Delivery Form Liquid Liquid Colour Opaque white White Viscosity (at time of production) mpas (Brookfield LVT, sp.4, 12 rpm, 25ºC / 77 F) mpas (Brookfield LVT, sp.4, 60 rpm, 25ºC / 77 F) ph (at time of production) 9,5-10,7 (at 25 C / 77 F) 1,3-2,1 (at 25 C / 77 F) Dry content 64 69% Not applicable Storage Life (months) Storage Conditions 15 C/59 F 20 C/68 F 30 C/86 F 15 C/59 F 20 C/68 F 30 C/86 F Recommended storage temperature 15 C to 25 C / 59 F to 77 F. Only short time exposure to temperatures below 10 C / 50 F and above 30 C / 86 F are acceptable. The product can be frozen but it must be thawed, raised to room temperature and homogenized before usage. Recommended storage temperature; 15 C to 25 C / 59 F to 77 F. Only short time exposure to temperatures below 10 C / 50 F and above 30 C / 86 F are acceptable. Frozen and thawed product cannot be used due to irreversible changes in the product. Formaldehyde Info 0.8% free formaldehyde Contains no formaldehyde Density Appr kg/m³ Appr kg/m³ Glue Line Properties Approvals Light coloured glue lines. High water and weather resistance. Fulfils the requirements according to EN 301 (for glue type I and II, service classes 1, 2, 3), EN 391, EN 392 and DIN with hardener 2579 is approved by Norsk Treteknisk Institutt (NTI), Norway, Materialprüfungsanstalt Universität Stuttgart - Otto- Graf-Institut (MPA), Institut Technologique FCBA, France, SKH/KOMO (DHBC No ), Holland and BUtgb (ATG 06/2662) Belgium for the production of load-bearing timber 1

2 structures with hardener 2579 fulfils the requirements according EN 301 for glue type I for service classes 1, 2, 3 in EN 386 as well as the requirements in DIN for the production of load-bearing timber structures according DIN The combination can be used for the production of laminated beams according to EN It is allowed to colour the products with Acomix WZ1. The maximum allowed addition is 1 part by weight to either the adhesive or the hardener or to both as long as the total amount is maximum 1% The intention for use of this adhesive system is with separate application of glue and hardener. However the system is also approved to be used as a mixed system. When glue and hardener are applied separately only Casco Adhesives Separate Ribbon Spreader 6230 is allowed for use. When separate application is used the maximum allowed bond-line thickness is 0.3 mm. Gluing Operation Information Applications Laminated Beams, Duo-Trio Beams, I-Beams Press Type Clamp carrier, Cold Press, Hot Press, Continuous Press, and High Frequency press Press Temperature Minimum pressing temperature is 20 C / 68 F Glue joint temperature Mixing ratio 100:20 Pressing time when a thin glue line is guaranteed (approx. 0.1 mm) 20 C / 68 F 6h Glue joint temperature Mixing ratio 100:50 20 C / 68 F 2h Glue joint temperature Mixing ratio 100: C / 68 F 65 Glue joint temperature Mixing ratio 100:20 Pressing time according to EN (0.3 mm glue line) 20 C / 68 F 6h 00 Glue joint temperature Mixing ratio 100:50 20 C / 68 F 3h 15 Glue joint temperature Mixing ratio 100: C / 68 F 3h 2

3 Mixing ratio 15 C/59 F 20 C/68 C 30 C/86 C Pot Life 100: : : Pressure Assembly Time (20 C / 68 F) Minimum 0,5 MPa for soft wood. Minimum 1,0 MPa for hard wood. In laminated beam production: Minimum 0,7 MPa for 33 mm lamellas. Minimum 0,9 MPa for 45 mm lamellas. Gluing conditions Mixing Ratio Max Closed 250 g/m² / 51 Ibs/1000 ft² 100: g/m² / 82 Ibs/1000 ft² 100:20 2h 250 g/m² / 51 Ibs/1000 ft² 100: g/m² / 82 Ibs/1000 ft² 100:50 1h g/m² / 51 Ibs/1000 ft² 100: g/m² / 82 Ibs/1000 ft² 100: : (adhesive: hardener) Mixing Ratio (by weight) Glue Spread Moisture content of wood Preparation of wood Temperature of wood Post curing The accuracy in the hardener amount shall be ±3 pbw both when the glue and hardener are used in separate application or as a glue mixture g/m², for laminated beams preferably g/m² 8-15%, for laminated beams preferably 10-12% For best result the wood must be smoothly planed. For optimum bond strength the bonding operation shall take place within 24 hours after preparation. In order to meet the given press times the temperature of the wood must not be below 20 C / 68 F. After the pressing time, the bond line has enough strength for the construction to be handled. Full strength will be reached after a certain time, depending on the pressing time and the pressing temperature. 3

4 Machinery Applicator Mixer Accessories Separate ribbon spreader for MF and MUF (two component system) Separate ribbon spreader for MF and MUF (three component system Ribbon spreader Roller spreader width <300mm Roller spreader width >400mm Mixing system for UF, PRF, MUF Mixing system for UF, PRF, MUF Mixing and sometimes applying system for MUF, PRF, UF 6205-Pulse wheel Metering system for UF, PRF, MUF Cooler lamella temperature sensor Cleaning equipment Waste water disposal system Casco glue log Control unit Level sensors Day tanks 4

5 Handling and HSE info Handling Always use gloves and goggles when handling the product. Cleaning Waste handling - of the products Glue on skin should be washed with soap and water. For the equipment, use lukewarm water w addition of Glue wash 4450 or Washing agent 2704 (for more info see General Info). Cleaning must start before the system cures. Glue - Is normally classified as hazardous waste (contains free formaldehyde.) Hardener - Depending on classification hardeners may be considered as hazardous waste, check the SDS (section 13). Mixed glue and hardener Can normally be treated as non hazardous waste when fully cured. NOTE! There might be national and/or local regulatory differences, therefore always keep a dialogue with the local authorities. Waste water treatment - of the waste water Chemical precipitation drain* Biological treatment drain* Mechanical precipitation drain* * municipal sewage with biological treatment NOTE! There might be national and/or local regulatory differences, therefore always keep a dialogue with the local authorities. For more info, see General Information below. Health and Safety For more information, please see respective SDS. For more information regarding the above mentioned data, see respective section below Legal clause The information is based on laboratory tests and practical experience. It is introductory and intended to help the user find the most suitable method of working. Since the user's production conditions are beyond our control, we cannot be held responsible for the results of the work which is affected by local circumstances. In each particular case testing and continuous control are recommended. 5

6 General information in alphabetic order Accessories (Machine) Examples of accessories include glue cooler, day tank system, control system for glue amount, and ratio of glue and hardener. For more information about accessories, please contact your Casco Adhesives representative. Applications Applicator Approvals Assembly Time Cleaning Examples of applications include flooring, curved plywood, foliating, doors and windows, laminated beams, assembly, veneering, upholstery, board on frame, and edge-glued panels. Our adhesives systems are developed specifically for different applications. For more information, see the section, Gluing Operation Information. Examples of applicators include the roller spreader, ribbon spreader, toothed trowel, and spray box. Recommended applicators can be found in the section, Machinery. Adhesives systems and/or final glued constructions may be subject to official tests and certifications. These tests and certifications are performed in accordance with standards such as ANSI, DIN, JAS, JIS, and EN. The Approvals section lists glue systems that have been approved by external institutes. Assembly time is the time from the application of adhesive to the application of full pressure to the substrate. The total assembly time is comprised of open assembly time (OAT) plus closed assembly time (CAT). OAT is the time from the application of adhesive to substrate assembly. CAT is the time from substrate assembly to the application of full pressure. The OAT and the CAT are influenced by the glue spread, the moisture content in the wood, and the ambient temperature and humidity. Higher glue spread, lower temperature, and higher moisture content in the wood and in the surrounding air will extend the OAT and CAT. The pressure must be applied while the adhesive is still tacky. The OAT and CAT data should be regarded separately. The total assembly time (OAT + CAT) must be evaluated in each specific case. Equipments must be cleaned with lukewarm water before the adhesive has cured. Cured adhesive must be removed mechanically. The use of Glue Wash 4450 or Cleaning Agent 2704 is recommended to facilitate cleaning of the glue spreader. Glue Wash 4450; Add 1% of Glue Wash 4450 (calculated on the rest amount of glue mixture in the spreader) to the spreader. Thereafter the spreader is left running for approximately five minutes to ensure adequate mixing. When the mixing process is complete, the spreader can be washed with tepid water. 6

7 Formaldehyde emission information Glue line properties Glue spread Handling Cleaning Agent 2704; Empty as much of the glue-mix as possible from the roller. Pour Cleaning Agent 2704 along the entirety of the roller and let the roller rotate for approximately four minutes. Use 0.5kg of Cleaning Agent 2704 for a roller with a width of one meter. Wash the rollers with warm (60 C / 140 F) water. To clean a ribbon spreader, add a 50/50 (by weight) solution of warm water and Cleaning Agent 2704 to the spreader. Let the solution pump around the spreader for approximately four minutes, then wash with warm water. Emission of formaldehyde is measured according to official standards e.g. EN, JAS, JIS, ASTM. To determine the emission level of your glued product, a product sample must be sent to a testing institute for measurement. For more information on emissions norms, post treatments, and related information, please contact your Casco Adhesives representative. Examples of glue line properties include durability, water and heat resistance, cold creep, and colour. Glue line properties may also be classified according to norms and standards. The Approvals section lists glue systems approved by an external institute. Glue spread is chosen according to application, type of glue system and type of substrate. The glue spread given in the Product Information sheet is to be used as a guideline and might be changed due to local production parameters. For the production of structural timber constructions a reduction of the glue spread, e.g. at very short assembly times, is only allowed to be done together with Casco Adhesives Technical Advisors and depends on the production parameters for the production line in question. This optimization implies that the set parameters are followed and that a continuous control of the bonding quality is made by means of delamination tests. A slight squeeze out of adhesive along the edge of all the joints when pressure is applied indicates adequate glue spread and that the total assembly time has not been exceeded. A high squeeze out indicates excessive glue spread, very high press pressure, or a combination of these two factors. Higher glue spread can be used when long assembly times are required. An evenly applied glue spread is important. To achieve that a good quality applicator shall be used and regularly maintained. The optimal glue spread must be determined for each specific case. The Glue spread / Gluing Operation Information section provides a guideline. Avoid direct contact with adhesives and hardeners. Always use gloves and goggles. If adhesive or hardener comes in contact with skin, 7

8 Health and Safety Machine Time Miscibility Mixer Mixing ratio Moisture content ph immediately wash the affected area with soap and lukewarm water. Due to its low ph the hardener is corrosive to copper and coppercontaining alloys. Steel or plastic is therefore recommended for use in direct contact with the product. The Safety Data Sheet provides information regarding health and safety. Study this information carefully. Study the Safety Data Sheet before using the products. See also Handling. See Pot Life. Whether a product can be mixed with another product (for example when changing the glue or the hardener to another product) must be determined in each specific case. Please contact your Casco Adhesives representative for more information. Mixers are used for the automatic mixing of adhesive and hardener or for multi-component mixing. The mixer best suited for this system is listed in the Machinery section. The adhesive and hardener shall be used in the ratio provided in the section, Gluing Operation Information. If other mixing ratios are used, various factors including press times, pot lives, assembly times, and glue line quality will be affected. In the production of structural timber constructions the maximum allowed deviation from the given hardener ratio is ±2 parts by weight. If other maximum deviations are allowed this will be given in the Gluing Operation Information. If a mixed system is used it is important to ensure that the adhesive and hardener have been thoroughly mixed before the mixture is used. If mixing the hardener and adhesive by hand, add the hardener to the adhesive. The moisture content of the wood will affect the gluing result. High moisture content can slow down the system, and for some adhesive systems, excessively high moisture content will negatively affect the glue line quality. In some cases, excessively low moisture content can accelerate the gluing process. The moisture content of the wood will also affect the overall quality of the end product. Moisture content that is uneven, excessively low, high can cause the material to warp, cup and become uneven. The recommended moisture content of the wood for this system is listed in the section, Gluing Operation Information. The Product Specification section lists the ph and whether that ph is measured at the time of production or at the time of delivery. The ph may change over time. As long as the product is used within given storage time and stored under the recommended conditions, a small 8

9 Post curing Pot Life Preparation of wood Pressing Time change in ph will not affect the gluing operation or quality. Post curing is the time needed for the bond line to build enough strength to reach the final strength and water resistance. The specific post curing time depends on the pressing time, the pressing temperature, lamellae temperature, and the post curing temperature. Curing at temperatures other than the temperatures given in the Gluing Operation Information section will change the required post curing time. The relevant post curing time must be provided by a Casco Adhesives technical advisor. For more information about post curing, see the Post Curing Time / Gluing Operation Information section. Pot life is defined as the period of time during which the mixture of glue and hardener can be used. Casco Adhesives measures pot lives using controlled methods of analyses, so the pot lives of different systems can be compared. When glue and hardener are used in separate application no problem with pot life will occur since the glue and hardener are not mixed until being applied on the surfaces to be bonded. The so called machine time is related to the pot life of a system. The machine time depends largely on the roller speed, the glue mix temperature, humidity, ambient temperature, and the turnover of glue. Because of the different processes used, and because conditions vary from process to process, it is difficult to indicate the machine time for a specific system. The pot life can be used to provide a guideline for the machine time. The pot life and machine time can be prolonged by using Casco Adhesives Glue Cooler. Lower temperatures lead to a longer pot life and machine time. For best bonding results, the surface of the substrate must be carefully prepared. For optimum bond strength, the bonding operation shall take place within 24 hours after preparation. The surface must be free from dust, grease, oil, and other contaminants. The substrate must be carefully selected so an optimum bond line quality is achieved. Pressing time is the interval of time a bonded joint should be kept under pressure before handling. Casco Adhesives measures pressing times using controlled methods of analyses, so the pressing times of different systems can be compared. The given pressing times are related to a material temperature of approximately 20 C / 68 F. If the temperature of th e material is lower, the pressing time must be prolonged. The values given in the table are to be used as guidelines. The pressing time can be influenced, among other things, by the bond line thickness. 9

10 Press Temperature Press Type Press Pressure For the production of structural timber according to DIN 1052, the minimum pressing time given in the General Gluing Information is determined according to DIN (bond line thickness 0,5 mm) or EN (bond line thickness 0,3 mm). The given pressing times are related to the production of straight beams with a moisture content of approx 12%. When gluing curved beams or using wood with higher moisture content the pressing times have to be prolonged. For some adhesives, additional pressing times are given in the General Gluing Information for applications where a thin bond line (approx. 0,1 mm) can always be guaranteed. When thin bond lines (approx. 0,1 mm) are always guaranteed the minimum pressing time can be much lower as determined using DIN or EN The pressing time can, with the above mentioned conditions and only in cooperation with Casco Adhesives Technical Advisor be shortened according to the values given in the table for 0,1 mm joint thickness in the Gluing Operation Information. For these cases, the maximum bond line thickness has to be controlled regularly within the factory production control or the proper quality of the bond lines has to be controlled regularly within the factory production control by means of delamination tests. The pressing times in the Gluing Operation Information section should only be used as a guideline; pressing times for different processes must be determined in each specific case and in cooperation with Casco Adhesives technical adviser. Numerous parameters influence the performance of the glue system, such as the condition of the press, the moisture content of the substrate, the type of construction, and the species of wood. The press times in the Gluing Operation Information section correspond to 20 C / 68 F and 30 C / 86 F. However, the generation of heat in the actual glue line depends on the press technology being used (see Press Type). Some adhesive systems may require special glue line temperature intervals. The press temperatures best suited for a system are listed in the section, Gluing Operation Information. Many press types exist. The press type best suited for a system is listed in the Gluing Operation Information section. This is the pressure holding the substrates together during the press operation. In laminated beam production the necessary press pressure is depending on e.g. the thickness of the lamellae and the wood species. When separate application of glue and hardener is used the minimum press pressure shall be 0.8 MPa independent of the thickness of the lamellae in order to secure that there is a good mixing between glue and hardener and that the maximum bond-line thickness is 0.3 mm. When a glue mixture is used, soft wood requires a pressure of MPa for a lamellae thickness of 33 mm while a lamellae thickness of 45 mm requires MPa. The thicker the lamellae the higher press 10

11 pressure is needed. Hardwood requires at least 1.0 MPa. For other types of gluing the required press pressures are: Minimum 0,5 MPa for soft wood Minimum 1,0 MPa for hard wood Storage Condition Storage Life (Shelf Life) Temperature of wood Too high pressure may cause excessive adhesive squeeze out, resulting in a starved glue line. Too low pressure may result in poor contact between the two surfaces, causing a weak bond. In general the recommended pressure for wood gluing is 0,3-1,0 MPa. More exact pressure levels for different processes must be determined in each specific case in order to obtain optimal bond strength. In order to achieve the given storage life for the product, it is very important that the product is stored under the recommended conditions. The optimal storage conditions for this system can be found in the Product Specification section. See also Storage Life. The storage life for a product is determined by parameters such as reactivity, viscosity and rheology. The storage time ends when the reactivity, viscosity or rheology transforms from a relatively stable value to a value that can affect the gluing quality. An excessively high temperature will accelerate certain chemical and physical phenomena in some products and shorten the storage life. An excessively low temperature may cause irreversible reactions during freezing, such as gel and lump formation. If the packaging is left open for long periods, the glue is susceptible to skin formation on the surface. To avoid skin formation, keep the packaging closed when not in use. If the viscosity has increased but the reactivity is still sufficient, the storage life of some products can be prolonged if the product can be stirred before usage. Emulsion-based products can normally be used as long as they have not separated or thickened, and show no signs of bacterial degradation (bad smell and low viscosity). Separation is evident as a visible layer of water on top of the adhesive. These descriptions are guidelines and they do not comply with all products. Always contact your nearest Casco Adhesives representative for assistance and recommendations. The storage life and conditions are listed in the section, Product Specification. If a glue system is used for cold pressing* or pressing at low temperatures, the temperature of the wood has a significant impact on the pressing time. For example, when the incoming wood has a temperature of 10 C / 50 F, the press time is subst antially longer than 11

12 when the wood has a temperature of 20 C / 68 F. For the production of laminated beams the minimum temperature must be 20 C / 68 F. The temperature of the wood has greater impact when pressing at low temperatures than when pressing at temperatures above approximately 50 C / 122 F. However, pressing times will be affected even at higher pressing temperatures during colder seasons, when the temperature of the wood can drop to close to 0 C / 32 F. In order to achieve the given press times, the temperature of the wood must not fall below the minimum temperature listed in the Temperature of wood / Gluing Operation Information section. *cold press is defined as the absence of an external heating source like a hot press or radio frequency. Viscosity Waste handling - of the products Viscosity is defined as the resistance to the flow of a liquid. The Product Specification section lists the viscosity and specifies whether the value is measured at time of production or at time of delivery. The viscosity may change over time. As long as the product used within the given storage time and stored under the recommended conditions, a small change in viscosity will affect neither the gluing operation nor the quality. Viscosity is very temperature dependent; high temperature normally results in a low viscosity, and low temperature normally results in a high viscosity. In order to ensure an even viscosity of the adhesive components, the use of Casco Adhesives Glue Cooler is recommended. Glue - Normally classified as hazardous waste (contains free formaldehyde.) Hardener - Depending on classification hardeners may be considered as hazardous waste, check the SDS (section 13). Mixed glue and hardener Can normally be treated as non hazardous waste when fully cured. NOTE! There might be national and/or local regulatory differences, therefore always keep a dialogue with the local authorities. If assistance is needed, contact Casco Adhesives Environmental Advisors. Waste water treatment - of the waste water Chemical precipitation municipal sewage with biological treatment Additives 4411, 4412 and 4413 are products that shall be used to decrease the amount of glue residuals in glue waste water. The products act as flocculants, thus clustering the glue particles together, making them to sediment. After treatment, the waste water has a lower dry content, which prevents the waste water from clogging pipes and drains. The obtained sediment, when dried, can be disposed of as nonhazardous industrial waste. 12

13 Collecting waste water An easy way to collect glue waste water is to use empty glue barrels. It is appropriate to have two or more barrels for this purpose, depending on the amount of waste water and the time it takes for the sediment to form after precipitation. Handling of treated waste water The treated waste water can normally not be let out directly into the drains without permission from the local authorities. Handling of sediment When a barrel is full of sediment, let it stand until the sediment has dried, preferably in high temperature (above 50 C / 122 F). The barrels with the dry sediment can thereafter be disposed of as non-hazardous industrial waste. Contact local authorities for directions on how to dispose For more information see Product Information for 4411/4412/4413. Biological treatment drain Waste water with high formaldehyde levels sometimes needs to be treated biologically to reduce the formaldehyde before it can be treated in a municipal sewage treatment plant with a biological step. One way of reducing formaldehyde levels is by using micro organisms adapted for formaldehyde. Casco Biological system 6263 is a biological system for treatment of such glue waste water. The biological treatment method will reduce the formaldehyde levels in the wash water, and thereafter the wash water can normally be let out via the drain to the sewage system. This treatment is carried out in three steps; equalizing, biological process and sedimentation. The sludge resulting from the sedimentation should be left to dry (preferably above 50 C / 122 F) and can after that normally be treated as non hazardous industrial waste. Mechanical Precipitation municipal sewage with biological treatment Mechanical precipitation (sedimentation) is used to lower the solid content of the waste water in order to minimize the risk of clogging of pipes. Sedimentation of the waste water can easily be carried out in an empty barrel or IBC container depending on the amount of wash water used. When the container is full of sludge it should be left to dry (preferably above 50 C / 122 F) and can after that normally be treated as non hazardous industrial waste. The water phase can normally not be let out directly into the drain without permission from the local authorities. 13

14 NOTE! There might be national and/or local regulatory differences, therefore always keep a dialogue with the local authorities. If assistance is needed, contact Casco Adhesives Environmental Advisors. 14