EP0564013A1 - Method for proportioning glue components - Google Patents
Method for proportioning glue components Download PDFInfo
- Publication number
- EP0564013A1 EP0564013A1 EP93200571A EP93200571A EP0564013A1 EP 0564013 A1 EP0564013 A1 EP 0564013A1 EP 93200571 A EP93200571 A EP 93200571A EP 93200571 A EP93200571 A EP 93200571A EP 0564013 A1 EP0564013 A1 EP 0564013A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- components
- storage containers
- time
- mixing ratio
- weight per
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/80—Forming a predetermined ratio of the substances to be mixed
- B01F35/83—Forming a predetermined ratio of the substances to be mixed by controlling the ratio of two or more flows, e.g. using flow sensing or flow controlling devices
- B01F35/832—Flow control by weighing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/40—Mixing liquids with liquids; Emulsifying
Definitions
- the invention relates to a method for mixing binders using at least two components, which are flowed from separate storage containers towards a common mixing point.
- the storage containers are continuously weighed, and their change of weight per unit of time is determined.
- the invention concerns a device for implementing the method.
- the resin and the curing agent When using curing adhesive systems, the resin and the curing agent must be kept in separate containers and should not be mixed until a short time before applying the glue. If the glue line is to be sufficiently strong, the mixing ratio of resin to curing agent has to be precise. This is especially important in the making of load-bearing constructions, such as beams, where a weak glue line may have disastrous consequences.
- the invention concerns a method for mixing binders using at least two components including a resin and a curing agent, which are flowed from separate storage containers towards a common mixing point.
- the storage containers are continuously weighed, and their change of weight per unit of time is determined.
- the flow ratio, and consequently also the actual mixing ratio of the components can be determined on the basis of the change of weight per unit of time of each container.
- the measured and/or determined values are stored in a form which enables subsequent control of the mixing ratio between the components at a certain point of time.
- the data may, for instance, be stored in a memory in the control unit, in other machine-readable form, or be printed directly on a paper.
- the control unit may also permit direct reading of all data on a display.
- the actual mixing ratio is compared with a set point determined according to the binder system used. If the deviation exceeds a predetermined value, for instance ranging from about 0.5% to about 10% depending on the binder system, an alarm can be given, calling the attention of an operator who can then correct the deviation by altering the flow of one or more of the components, e.g. by changing the speed of one or more of the dosing pumps.
- the determination of the actual mixing ratio and the comparison with the set point are automatically performed in a control unit, which also makes it possible to allow the control unit to automatically control the flow of one or more of the components on the basis of the measured changes of weight per unit of time of each storage container, thereby substantially maintaining a set point for the mixing ratio of the components. If the components are a resin and a curing agent, it is generally sufficient that the control unit automatically controls the speed of one dosing pump for the curing agent.
- the storage containers are weighed on scales transmitting signals to the control unit, which can be done e.g. by suspending the containers from preferably electronic load transducers.
- the load transducers should be able to yield such accurate weighing results that the deviation is at the most about ⁇ 5%, in particular at the most ⁇ about 2%.
- the method according to the invention is advantageous for all curing binder systems in which two or more components are to be mixed, for instance resorcinol-formaldehyde resin and formaldehyde curing agent, or urea resin and an acid curing agent, such as ammonium chloride.
- a resin and an acid curing agent such as ammonium chloride.
- other common additives to binders such as diluents (e.g. water or organic solvents), fillers and plasticisers, can be admixed to the binder in the same way.
- the components can be brought together and mixed by known methods, e.g. in closed vessels; on a plate, as in SE Patent 418,753; on a roller, as in SE Patent Application 9102874-6; or on the object to be coated with the binder, as in SE Patent 373,525.
- the invention further concerns a device for implementing the method.
- This device comprises separate storage containers and dosing pumps for each component, means for continuously weighing each storage container, and means for determining the change of weight of the storage containers per unit of time.
- the storage containers are suspended from preferably electronic load transducers transmitting signals to a control unit capable of determining the change of weight per unit of time for each storage container.
- the control unit is adapted to determine the actual mixing ratio of the components, compare this ratio with a set point, and give an alarm if the deviation exceeds a predetermined value.
- control unit is adapted to automatically control the flow of one or more of the components on the basis of the measured changes of weight per unit of time of the storage container of each component, thereby substantially maintaining a set point for the mixing ratio of the components.
- the device comprises means for storing the measured and/or determined values in a form enabling subsequent control of the mixing ratio between the components at a certain point of time.
- the invention there is no need of continuous manual supervision for immediately detecting and adjusting deviations in the mixing ratio of resin to curing agent that may arise owing to alterations of the viscosity, clogging of the equipment, leakage, or quite simply by the emptying of a storage container.
- it is possible to accurately control the mixing ratio of resin to curing agent, which is a condition for obtaining glue lines of high and uniform quality.
- the invention also makes it possible to control the total consumption of the binder and thereby optimise this amount.
- the drawing shows two storage tanks 1, 2 for resin and curing agent, respectively.
- dosing pumps 6, 7 which lead to a common mixing point (not shown).
- the tanks 1, 2 are suspended from electronic load transducers 3, 4 which are connected to a control unit 5.
- the control unit 5 is adapted to control one or both of the dosing pumps 6, 7.
- the tanks 1, 2 contain liquid resin and liquid curing agent, respectively. Resin and curing agent are pumped to a common mixing point by the dosing pumps 6, 7. A suitable mixing ratio of resin to curing agent, e.g. ranging from about 1:1 to about 1:100 depending on the adhesive system and the degree of dilution, is set on the control unit 5 and then constitutes a set point.
- the electronic load transducers 3, 4 continuously transmit signals relating to the weight of the tanks 1, 2, to the control unit 5 which, at suitable time intervals, e.g. ranging from about 1 second to 5 minutes, records the weight and compares it with the preceding value, thereby determining the loss of weight of each tank 1, 2 per unit of time.
- the actual mixing ratio of resin to curing agent is determined.
- the measured and the determined values of the flow and the mixing ratio of the resin and the curing agent is stored in the control unit 5, and/or transmitted to a printer (not shown), thus enabling subsequent control of the actual mixing ratio at a certain point of time.
- an alarm is given, calling the attention of an operator who may then check whether there is any serious malfunction, and optionally adjust the speed of e.g. the dosing pump for the curing agent, thereby establishing a suitable mixing ratio once again.
- one or both of the dosing pumps 6, 7 are automatically controlled by the control unit, so as to maintain at all times a correct mixing ratio. An alarm is given only when the disturbances are so severe that they cannot be offset by adjusting the dosing pumps 6, 7, e.g. if the flow is completely stopped by clogging or if one of the tanks has become empty.
Landscapes
- Chemical Kinetics & Catalysis (AREA)
- Chemical & Material Sciences (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Accessories For Mixers (AREA)
- Nitrogen And Oxygen Or Sulfur-Condensed Heterocyclic Ring Systems (AREA)
- Pharmaceuticals Containing Other Organic And Inorganic Compounds (AREA)
- Control Of Motors That Do Not Use Commutators (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
- Structure Of Belt Conveyors (AREA)
- Materials For Medical Uses (AREA)
- External Artificial Organs (AREA)
- Coating Apparatus (AREA)
- Dicing (AREA)
- Die Bonding (AREA)
- Detergent Compositions (AREA)
- Organic Insulating Materials (AREA)
Abstract
Description
- The invention relates to a method for mixing binders using at least two components, which are flowed from separate storage containers towards a common mixing point. According to the invention, the storage containers are continuously weighed, and their change of weight per unit of time is determined. Also, the invention concerns a device for implementing the method.
- When using curing adhesive systems, the resin and the curing agent must be kept in separate containers and should not be mixed until a short time before applying the glue. If the glue line is to be sufficiently strong, the mixing ratio of resin to curing agent has to be precise. This is especially important in the making of load-bearing constructions, such as beams, where a weak glue line may have disastrous consequences.
- In devices where the resin and the curing agent are continuously flowed from separate storage containers to a common mixing point, it has been found difficult to maintain, for any substantial period of time, full control of the mixing ratio, which may mean that many of the glued objects will have to be scrapped. Above all, it is very difficult to measure the flow of resin, in that it has high viscosity which in addition varies considerably, both with age and with temperature. Therefore, it is also difficult to maintain a constant flow of resin, since this varies according to the viscosity also at a constant speed of the dosing pump. Measuring the level in the storage containers does not yield sufficiently accurate results, since the cross-sectional area of the containers mostly is comparatively large while the flows of resin and curing agent are comparatively small. In the case of functional trouble, causing objects to be joined with a binder of wrong composition, subsequent identification of these objects is very difficult. Today, it is possible to ensure adequate gluing quality only by continuous manual supervision and recurrent sampling, which requires a lot of personnel and is quite expensive.
- There is thus a great need for a method of controlling the mixing ratio of the different components in a curing adhesive system which method preferably also should enable subsequent control. This need is satisfied by the present invention, which relates to a method as defined in the appended claims.
- More specifically, the invention concerns a method for mixing binders using at least two components including a resin and a curing agent, which are flowed from separate storage containers towards a common mixing point. In the method, the storage containers are continuously weighed, and their change of weight per unit of time is determined. The flow ratio, and consequently also the actual mixing ratio of the components, can be determined on the basis of the change of weight per unit of time of each container. Preferably, the measured and/or determined values are stored in a form which enables subsequent control of the mixing ratio between the components at a certain point of time. The data may, for instance, be stored in a memory in the control unit, in other machine-readable form, or be printed directly on a paper. The control unit may also permit direct reading of all data on a display.
- Suitably, the actual mixing ratio is compared with a set point determined according to the binder system used. If the deviation exceeds a predetermined value, for instance ranging from about 0.5% to about 10% depending on the binder system, an alarm can be given, calling the attention of an operator who can then correct the deviation by altering the flow of one or more of the components, e.g. by changing the speed of one or more of the dosing pumps. Suitably, the determination of the actual mixing ratio and the comparison with the set point are automatically performed in a control unit, which also makes it possible to allow the control unit to automatically control the flow of one or more of the components on the basis of the measured changes of weight per unit of time of each storage container, thereby substantially maintaining a set point for the mixing ratio of the components. If the components are a resin and a curing agent, it is generally sufficient that the control unit automatically controls the speed of one dosing pump for the curing agent.
- Conveniently, the storage containers are weighed on scales transmitting signals to the control unit, which can be done e.g. by suspending the containers from preferably electronic load transducers. Preferably, the load transducers should be able to yield such accurate weighing results that the deviation is at the most about ± 5%, in particular at the most ± about 2%.
- The method according to the invention is advantageous for all curing binder systems in which two or more components are to be mixed, for instance resorcinol-formaldehyde resin and formaldehyde curing agent, or urea resin and an acid curing agent, such as ammonium chloride. In general, it is enough that the method is applied to the mixing of resin and curing agent, but it is evident that also other common additives to binders, such as diluents (e.g. water or organic solvents), fillers and plasticisers, can be admixed to the binder in the same way. The components can be brought together and mixed by known methods, e.g. in closed vessels; on a plate, as in SE Patent 418,753; on a roller, as in SE Patent Application 9102874-6; or on the object to be coated with the binder, as in SE Patent 373,525.
- The invention further concerns a device for implementing the method. This device comprises separate storage containers and dosing pumps for each component, means for continuously weighing each storage container, and means for determining the change of weight of the storage containers per unit of time. Preferably, the storage containers are suspended from preferably electronic load transducers transmitting signals to a control unit capable of determining the change of weight per unit of time for each storage container. Preferably, the control unit is adapted to determine the actual mixing ratio of the components, compare this ratio with a set point, and give an alarm if the deviation exceeds a predetermined value. In one embodiment, the control unit is adapted to automatically control the flow of one or more of the components on the basis of the measured changes of weight per unit of time of the storage container of each component, thereby substantially maintaining a set point for the mixing ratio of the components. Preferably the device comprises means for storing the measured and/or determined values in a form enabling subsequent control of the mixing ratio between the components at a certain point of time.
- By the invention, there is no need of continuous manual supervision for immediately detecting and adjusting deviations in the mixing ratio of resin to curing agent that may arise owing to alterations of the viscosity, clogging of the equipment, leakage, or quite simply by the emptying of a storage container. Thus, it is possible to accurately control the mixing ratio of resin to curing agent, which is a condition for obtaining glue lines of high and uniform quality. By storing all the data, one may afterwards check which objects may have been coated with a wrong binder composition in the case of functional trouble. The invention also makes it possible to control the total consumption of the binder and thereby optimise this amount.
- In the following, the invention will be described in more detail with reference to the accompanying drawing schematically illustrating a device according to the invention. However, the invention is not restricted to the embodiment shown, but is defined by the scope of the appended claims only.
- The drawing shows two
storage tanks 1, 2 for resin and curing agent, respectively. To the tanks are connected dosing pumps 6, 7 which lead to a common mixing point (not shown). Thetanks 1, 2 are suspended from electronic load transducers 3, 4 which are connected to acontrol unit 5. In one embodiment, thecontrol unit 5 is adapted to control one or both of the dosing pumps 6, 7. - When the illustrated device is in use, the
tanks 1, 2 contain liquid resin and liquid curing agent, respectively. Resin and curing agent are pumped to a common mixing point by the dosing pumps 6, 7. A suitable mixing ratio of resin to curing agent, e.g. ranging from about 1:1 to about 1:100 depending on the adhesive system and the degree of dilution, is set on thecontrol unit 5 and then constitutes a set point. The electronic load transducers 3, 4 continuously transmit signals relating to the weight of thetanks 1, 2, to thecontrol unit 5 which, at suitable time intervals, e.g. ranging from about 1 second to 5 minutes, records the weight and compares it with the preceding value, thereby determining the loss of weight of eachtank 1, 2 per unit of time. On the basis of these values, the actual mixing ratio of resin to curing agent is determined. The measured and the determined values of the flow and the mixing ratio of the resin and the curing agent is stored in thecontrol unit 5, and/or transmitted to a printer (not shown), thus enabling subsequent control of the actual mixing ratio at a certain point of time. Should the actual mixing ratio deviate too much from the set point, an alarm is given, calling the attention of an operator who may then check whether there is any serious malfunction, and optionally adjust the speed of e.g. the dosing pump for the curing agent, thereby establishing a suitable mixing ratio once again. In another embodiment, one or both of the dosing pumps 6, 7 are automatically controlled by the control unit, so as to maintain at all times a correct mixing ratio. An alarm is given only when the disturbances are so severe that they cannot be offset by adjusting the dosing pumps 6, 7, e.g. if the flow is completely stopped by clogging or if one of the tanks has become empty.
Claims (10)
- A method for mixing binders using at least two components including a resin and a curing agent which are flowed from separate storage containers (1, 2) towards a common mixing point, characterised by continuously weighing the storage containers (1, 2) and determining their change of weight per unit of time.
- A method as claimed in claim 1, characterised by determining the actual mixing ratio of the components on the basis of the changes of weight per unit of time of the storage containers (1, 2).
- A method as claimed in claim 2, characterised by comparing the actual mixing ratio of the components with a set point, an alarm being given if the deviation exceeds a predetermined value.
- A method as claimed in any one of claims 1-3, characterised by automatically controlling, by means of a control unit (5), the flow of one or more of the components on the basis of the measured changes of weight per unit of time of the storage containers (1, 2), thereby substantially maintaining a set point for the mixing ratio of the components.
- A method as claimed in any one of claims 1-4, characterised by suspending, for purposes of weighing, the storage containers from load transducers (3, 4) that transmit signals to the control unit (5).
- A method as claimed in any one of claims 1-5, characterised by storing the measured and/or the determined values in a form which enables subsequent control of the mixing ratio between the components at a certain point of time.
- A device for implementing the method as claimed in any one of claims 1-6, characterised in that it comprises separate storage containers (1, 2) and dosing pumps (6, 7) for the components, means (3, 4) for continuously weighing the storage containers (1,2), and means (5) for determining the change of weight per unit of time of the storage containers (1, 2).
- A device as claimed in claim 7, characterised in that the storage containers are suspended from load cells (3, 4) transmitting signals to a control unit (5) which is capable of determining the change of weight per unit of time of each storage container (1, 2).
- A device as claimed in claim 8, characterised in that the control unit (5) is adapted to determine the actual mixing ratio of the components, compare this ratio with a set point, and give an alarm if the deviation exceeds a predetermined value.
- A device as claimed in any one of claims 7-9, characterised in that the device comprises means for storing the measured and/or the determined values in a form which enables subsequent control of the mixing ratio between the components at a certain point of time.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
SE9200988 | 1992-03-30 | ||
SE9200988A SE9200988L (en) | 1992-03-30 | 1992-03-30 | Put on gluing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0564013A1 true EP0564013A1 (en) | 1993-10-06 |
EP0564013B1 EP0564013B1 (en) | 1998-01-21 |
Family
ID=20385789
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP93200571A Expired - Lifetime EP0564013B1 (en) | 1992-03-30 | 1993-03-02 | Method for proportioning glue components |
Country Status (8)
Country | Link |
---|---|
EP (1) | EP0564013B1 (en) |
AT (1) | ATE162426T1 (en) |
DE (1) | DE69316420T2 (en) |
DK (1) | DK0564013T3 (en) |
ES (1) | ES2112380T3 (en) |
FI (1) | FI102876B1 (en) |
NO (1) | NO308542B1 (en) |
SE (1) | SE9200988L (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6414312B1 (en) | 1998-03-05 | 2002-07-02 | Akzo Nobel N.V. | Method for controlling a process for the production of a cellulose fiber containing product |
EP2803425A1 (en) * | 2013-05-13 | 2014-11-19 | Loramendi, S.COOP. | Dosage apparatus and operating method for a dosage apparatus |
CN106881049A (en) * | 2015-12-15 | 2017-06-23 | 上海奥星制药技术装备有限公司 | Homogeneous control system and its control method |
WO2020094529A1 (en) * | 2018-11-05 | 2020-05-14 | Gurit (Uk) Ltd | Apparatus for, and method of, controlling the mixing of components of curable resin systems |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2925197A (en) * | 1956-10-03 | 1960-02-16 | Carl Schenck Machinenfabrik G | Method of and apparatus for feeding liquid to flowing material |
US3245584A (en) * | 1964-05-20 | 1966-04-12 | Richard D Linville | Method and apparatus for mixing and blending |
US3442453A (en) * | 1965-04-30 | 1969-05-06 | Ben Whitehouse Jr | Dispensing unit |
US3638916A (en) * | 1970-09-01 | 1972-02-01 | Phillips Petroleum Co | Method and apparatus for blending materials |
DE2152533A1 (en) * | 1970-10-23 | 1972-04-27 | List Heinz | Process for the continuous metering of several components of a mixed product and a device for carrying out this process |
US4525071A (en) * | 1984-05-31 | 1985-06-25 | Crawford & Russell, Inc. | Additive inventory control, batching and delivery system |
EP0170322A2 (en) * | 1984-07-31 | 1986-02-05 | "National Forge Europe" | Equipment for mixing powder- and/or granule-like components from a body to be compressed under high pressure |
US4733971A (en) * | 1986-02-26 | 1988-03-29 | Micro Chemical, Inc. | Programmable weight sensitive microingredient feed additive delivery system and method |
-
1992
- 1992-03-30 SE SE9200988A patent/SE9200988L/en not_active Application Discontinuation
-
1993
- 1993-03-02 DK DK93200571T patent/DK0564013T3/en active
- 1993-03-02 AT AT93200571T patent/ATE162426T1/en not_active IP Right Cessation
- 1993-03-02 ES ES93200571T patent/ES2112380T3/en not_active Expired - Lifetime
- 1993-03-02 EP EP93200571A patent/EP0564013B1/en not_active Expired - Lifetime
- 1993-03-02 DE DE69316420T patent/DE69316420T2/en not_active Expired - Fee Related
- 1993-03-26 FI FI931388A patent/FI102876B1/en active
- 1993-03-26 NO NO931142A patent/NO308542B1/en not_active IP Right Cessation
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2925197A (en) * | 1956-10-03 | 1960-02-16 | Carl Schenck Machinenfabrik G | Method of and apparatus for feeding liquid to flowing material |
US3245584A (en) * | 1964-05-20 | 1966-04-12 | Richard D Linville | Method and apparatus for mixing and blending |
US3442453A (en) * | 1965-04-30 | 1969-05-06 | Ben Whitehouse Jr | Dispensing unit |
US3638916A (en) * | 1970-09-01 | 1972-02-01 | Phillips Petroleum Co | Method and apparatus for blending materials |
DE2152533A1 (en) * | 1970-10-23 | 1972-04-27 | List Heinz | Process for the continuous metering of several components of a mixed product and a device for carrying out this process |
US4525071A (en) * | 1984-05-31 | 1985-06-25 | Crawford & Russell, Inc. | Additive inventory control, batching and delivery system |
EP0170322A2 (en) * | 1984-07-31 | 1986-02-05 | "National Forge Europe" | Equipment for mixing powder- and/or granule-like components from a body to be compressed under high pressure |
US4733971A (en) * | 1986-02-26 | 1988-03-29 | Micro Chemical, Inc. | Programmable weight sensitive microingredient feed additive delivery system and method |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6414312B1 (en) | 1998-03-05 | 2002-07-02 | Akzo Nobel N.V. | Method for controlling a process for the production of a cellulose fiber containing product |
EP2803425A1 (en) * | 2013-05-13 | 2014-11-19 | Loramendi, S.COOP. | Dosage apparatus and operating method for a dosage apparatus |
WO2014184124A1 (en) * | 2013-05-13 | 2014-11-20 | Loramendi, S.Coop. | Dosage apparatus and operating method for a dosage apparatus |
CN106881049A (en) * | 2015-12-15 | 2017-06-23 | 上海奥星制药技术装备有限公司 | Homogeneous control system and its control method |
WO2020094529A1 (en) * | 2018-11-05 | 2020-05-14 | Gurit (Uk) Ltd | Apparatus for, and method of, controlling the mixing of components of curable resin systems |
GB2578731B (en) * | 2018-11-05 | 2023-05-10 | Gurit Uk Ltd | Apparatus for, and method of, controlling the mixing of components of curable resin systems |
Also Published As
Publication number | Publication date |
---|---|
EP0564013B1 (en) | 1998-01-21 |
SE9200988L (en) | 1993-10-01 |
DE69316420T2 (en) | 1998-06-25 |
NO931142D0 (en) | 1993-03-26 |
FI102876B (en) | 1999-03-15 |
FI102876B1 (en) | 1999-03-15 |
DE69316420D1 (en) | 1998-02-26 |
ES2112380T3 (en) | 1998-04-01 |
FI931388A0 (en) | 1993-03-26 |
SE9200988D0 (en) | 1992-03-30 |
ATE162426T1 (en) | 1998-02-15 |
NO308542B1 (en) | 2000-09-25 |
NO931142L (en) | 1993-10-01 |
DK0564013T3 (en) | 1998-09-14 |
FI931388A (en) | 1993-10-01 |
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