FI125788B - INJECTION EQUIPMENT AND INJECTION METHOD FOR FIBERS - Google Patents

Description

INJECTION EQUIPMENT AND INJECTION METHOD FOR FIELD OF THE INVENTION

The invention relates to an injection apparatus and a method of injection for a fibrous web. In particular, but not exclusively, the invention relates to surface sizing and coating of paper or board.

BACKGROUND OF THE INVENTION

At certain points in the manufacturing process, a fibrous web such as paper or board is desired to be treated with a web strength enhancing agent such as liquid glue. The adhesive treatment of the web essentially determines the strength properties of the end product. In most cases, various starches can be used as injection adhesives, to which various additives can be combined. In some cases, it is desired to coat the fibrous web with a coating composition containing pigments. The coating can affect, among other things, the appearance and printability of the web. The present invention is not limited to any particular adhesive composition or coating composition, and the adhesive should be understood to mean all at least partially absorbent web impregnating compositions.

In the spraying equipment, the viscosity of the treatment agent affects the formation of jets. The viscosity of the treating agent may also affect the penetration of the treatment agent, such as adhesive, into the fibrous web during the post-injection compression process.

Where different spraying treatments are required on different sides of the fibrous web, separate machine turns are provided in the known spraying apparatus for each side of the fibrous web, each having a machine container for the treating material. For example, single-sided dyeing or different dry matter content between the different sides have to be built using the fiber web on both sides of ruiskutuspalkeille dedicated machine cycle, which is expensive and space-consuming. Continuous recycling of specialty chemicals in the machine cycle is not always possible. Continuous recycling can be detrimental, for example, due to dilution of the detergent mixture.

Each side of the machine cycle the treatment agent is fed to one side of the fibrous web to the spray nozzles via a pipeline konesäiliöltä. The treatment agent recovered from the injection process can be recycled back to the machine container. The processing agents for the various sides of the fibrous web are formed in two machine containers into the desired compositions. The machine tanks are fed with dilution water and desired treatment agents, which are mixed in the machine tanks so that the treatment agents being sprayed on different sides provide suitable properties for the spraying operations.

When changes are to be made to the spraying process, the composition or viscosity of the treatment medium in the machine tank is changed. When changes are made to the treatment medium in the machine tank, the change made will have a delay effect on the spraying event. In many cases, the delay is greater than desired. One such case is the so-called. web stealing situation where the fibrous web to be treated tends to stick to the nip roll after the nip of the injection apparatus. The delay in the change in agent affecting the spraying event is affected by the volume of the machine tank used for actual mixing. In addition, the delay is affected by the volume of the pressure line from the machine reservoir to the injection nozzles. The volume of the pressure line is increased by the distance between the machine reservoir and the injection nozzles, which may be 20-30 meters, for example, and by the volume of the necessary actuators such as the pump and the pressure screen. A change in the composition of the processing agent in a machine container affects the amount of treatment agent in the machine container as a whole, which is not desirable in all circumstances, for example when a change in function is desired to be temporary or short-term.

Fl 121084 B discloses a method and apparatus for treating a paper or board web. The treatment agent mixture is sprayed onto the surface of the web by means of an injection apparatus, the web is led to pass through the press nip and the wet treatment mixture is pressed into the web in the press nip.

SUMMARY

According to a first aspect of the invention, there is provided an injection apparatus for a fibrous web, comprising a first injection means comprising injection nozzles for a first side of a fibrous web and a first injection line treatment medium for for direct injection onto one or both surfaces of the fibrous web by one or more injection means. Injection equipment comprising ruiskutusvälinekohtaisia the feed and mixing means, which is connected to the respective ruiskutusvälinekohtaisiin pressure lines in such a way that the fiber web on both sides of ruiskutusvälinekohtaiseen pressure line is connected to one or more of the feed and mixing means for feeding the mixture of material and for mixing the treatment agent among one or more of the feed and mixing means.

Preferably, the injection apparatus comprises a first supply and mixing means connected to the first pressure line and / or a second supply and mixing means connected to the second pressure line.

The injection apparatus may comprise a plurality of first injection means and / or a plurality of second injection means and a plurality of injection line-specific pressure lines. Preferably, a supply and mixing means is provided on the injection device specific pressure line or injection device specific pressure lines.

Preferably, the injection apparatus is configured to change the composition of the treatment medium to be fed through the first and / or second pressure lines prior to the injection nozzles.

Preferably, the injection apparatus has a single machine cycle comprising one machine container and an inlet piping leaving the machine container for supplying the treatment agent to the first pressure line and / or the second pressure line.

Preferably, the first pressure line and the second pressure line are formed by dividing the supply piping from the machine reservoir to the first and second injection means into two pressure lines. The first pressure line and the second pressure line may be divided in a pressure line after the pressure screen comprising the injection equipment.

According to some preferred embodiments, the injection apparatus comprises one or more first pressure lines for feeding the treating agent to one or more first injection means, respectively, and the injection apparatus comprises one or more second pressure lines for feeding the treatment agent to one or more second injection means, respectively.

Preferably, the feed and mixing means comprise as a feed means a mixing tube for feeding the mixing material to the pressure line. The mixing tube may be directly connected to a pressure line or mixing device such as a static mixer. Preferably, the alloy tube is connected to the pressure line before the mixing means.

Preferably, the feed and mixing means comprise a static mixer as a mixing means.

Preferably, the injection apparatus comprises a pressure screen, a flow measurement and / or a viscosity measurement of the treatment agent mixture, which is arranged in a pressure channel downstream of the pressure screen.

Preferably, the injection equipment comprises a pressure measurement, flow measurement and / or viscosity measurement of the treatment mixture, the measurement (s) being arranged in the pressure channel after the supply and mixing means.

Preferably, the injection apparatus is configured to mix the first and / or second pressure lines with one or more of the following: diluent, steam, gas, solid, starch, native starch, pigment, dye, carbon dioxide, chemical, specialty chemical.

A plurality of feed and mixing means may be provided on the first and / or second pressurized lines such that one feed and mixing means is configured to feed and mix one or more mixing agents at a time.

Preferably, the injection apparatus comprises a nip arranged in the direction of travel of the fibrous web downstream of the injection means for compressing the treatment agent mixture onto the fibrous web after injection.

Preferably, the injection apparatus comprises a single machine container; a supply piping arranged to leave the machine reservoir for dispensing the treatment agent into two or more pressure lines formed by injection means by dividing the supply piping; and one or more injection device-specific feed and mixing means coupled to respective injection device-specific pressure lines.

According to another aspect of the invention, there is provided an injection method for a fibrous web, the method comprising treating the fibrous web in an injection apparatus comprising a first injection means comprising injection nozzles for a first side of treatment agent into the second spraying means, and the treatment agent mixture is injected directly to one surface of the fibrous web, or both surfaces with one or more of injecting tool, and the spray apparatus comprises ruiskutusvälinekohtaisia the feed and mixing means, which is connected to the respective ruiskutusvälinekohtaisiin pressure lines in such a way that the fiber web on both sides of ruiskutusvälinekohtaiseen pressure line is connected to one or more of pi feed and mixing means, and in the process, mixing agent is fed and mixed with one or more feed and mixing means into a treatment medium.

Preferably, the injection apparatus comprises a first supply and mixing means connected to the first pressure line and / or a second supply and mixing means connected to the second pressure line.

Preferably, the composition of the treatment medium to be fed through the first and / or second pressure lines is changed prior to the injection nozzles.

Preferably, the treatment agent is supplied to the first thrust lines and / or to the second thrust lines by a single machine cycle of the injection apparatus comprising a single machine tank and a supply piping leaving the machine tank. Preferably, the treatment agent is fed to the first thrust line and / or the second thrust line by a single machine cycle of the injection apparatus comprising a single machine tank and an inlet piping leaving the machine tank.

Preferably, the first pressure lines and the second pressure lines are formed by dividing the supply piping from the machine reservoir to the first and second injection means into a plurality of injection line-specific pressure lines, respectively. Preferably, the first pressure line and the second pressure line are formed by dividing the supply piping from the machine reservoir to the first and second injection means into two pressure lines.

Preferably, the first pressure line and the second pressure line from the pressure line following the pressure screen comprising the injection apparatus.

Preferably, the injection apparatus comprises one or more first pressure lines for supplying the treatment agent to one or more first injection means, respectively, and the injection device comprising one or more second pressure lines for supplying the treatment agent to one or more second injection means, respectively.

Preferably, a dopant is supplied with dopant by a feed and mixing means comprising a duct as a dosing device. Preferably, the mixing agent is fed to the pressure line prior to the mixing means.

Preferably, the blend is mixed with a blender in the feed line by a feed and mixing means comprising a static mixer as a mixing means.

Preferably, the pressure of the treatment agent mixture is measured by pressure measurement, flow by flow measurement, and / or viscosity by viscosity measurement, which is arranged in a pressure channel downstream of the pressure screen comprised by the injection equipment.

Preferably, the pressure of the treating agent mixture is measured by pressure measurement, flow by flow measurement and / or viscosity by viscosity measurement, which measurement (s) are arranged in the pressure channel after the supply and mixing means.

Preferably, the feed of the mixing agent is controlled by the feed and mixing means based on pressure, flow and / or viscosity measurement.

Preferably, the first and / or second pressurized lines are mixed together as one or more of the following: diluent, steam, gas, solid, starch, native starch, pigment, dye, carbon dioxide, chemical, specialty chemical. PVA, silicone, coating paste, latex, pigment-surface adhesive, or the like, typically applied to the fibrous web, may also be used as the dopant.

Preferably, the injection apparatus comprises a press nip arranged in the direction of travel of the fibrous web after the injection means. Preferably, the method comprises compressing the treatment agent mixture onto the fibrous web in a press nip after injection.

The composition of the treatment agent to be sprayed on the first and / or second surface of the fibrous web may be individually modified. With a single machine cycle, the desired dry matter content and possible one-sided dyeing are achieved. The composition of the treating agent can be rapidly changed near the spraying event. The delay between detecting the need for a change and carrying out the change can be shortened compared to the prior art, since mixing of the dopant does not need to be done in a large volume of treatment medium or far in the machine reservoir upstream. Web stealing can be controlled quickly, for example by feeding and mixing dilution water into a pressure line that leads to the injection device. The pressure line can be dosed with water or chemical.

Injection equipment provides an advantageous opportunity to dispense specialty chemicals (so-called additives). For example, specialty chemicals can only be used as desired and the use of specialty chemicals can be targeted to the injection event more precisely in time and volume. There is no need to mix the dye or other chemical in the machine tank, whereby the required dopant is available if desired. Various side ruiskutuspalkeilla can be driven at different dry matter content.

The viscosity of the treating agent can be reduced if there are problems in the production of the adhesive. The viscosity of the treating agent can be reduced to be suitable for spraying.

Injection of the treatment agent may be accomplished by means of an adhesive press, a calender, a wire section, a belt press, a drying section or other papermaking apparatus. The species to be treated may include e.g. paperboard, inner packaging, corrugated board, corrugated board, fine paper, newspaper. The injectable composition may be starch, PVA, silicone, coating paste, latex, pigment-surface adhesive, or the like, typically applied to the fibrous web. Advantageously, the applicator blend applied increases the web strength.

Various embodiments of the present invention will be described or described only in connection with some or some aspects of the invention. One skilled in the art will appreciate that any embodiment of an aspect of the invention may be applied to the same and other aspects of the invention, alone or in combination with other embodiments.

BRIEF PRESENTATION OF THE PATTERNS

The invention will now be described, by way of example, with reference to Figure 1 of the accompanying drawing, which shows a simplified schematic diagram of an injection apparatus.

DETAILED EXPLANATION

It should be noted that the figure shown is not to scale, and that it mainly serves the purpose of illustrating embodiments of the invention.

Figure 1 illustrates an injection apparatus 10 comprising a single machine cycle 20. The injection apparatus 10 injects curing agent W onto a fibrous web W by a first injection means 11 and / or a second injection means 21, and thereafter the fibrous web is guided through a press nip 15. The treatment agent is supplied to the common plane the container 1 syöttöputkistolla fiber web on both sides of ruiskutuspalkeille and the treating agent composition can be changed by feeding and mixing a mixture of a substance or mixture of substances pass line 7 to a branch or branches 12, 22 leading to / leading to ruiskutuspalkkiin / ruiskutuspalkkeihin.

The injection apparatus comprises a first pressure line 12 leading to the first injection means 11. The injection apparatus comprises a first feed and mixing means arranged on the first pressure line 12. The first supply and mixing means comprises a first static mixer 13 and a first mixer line 13 '. The first mixer line 13 'leads to the first pressure line 12 before the first static mixer 13 or directly to the first static mixer 13.

The injection apparatus comprises a second pressure line 22 which leads to a second injection means 21. The injection apparatus comprises a second supply and mixing means arranged on a second pressure line 22. The second supply and mixing means comprises a second static mixer 23 and a second mixer line 23 '. The second alloying line 23 'leads to the second pressure line 22 before the second static mixer 23 or directly to the second static mixer 23.

According to some embodiments, the injection apparatus comprises a plurality of feed and mixing means coupled to the first and / or second pressure lines such that each feed and mixing means mixes a single mixing agent with the treatment medium. In the embodiment shown in Figure 1, one or more blending agents can be fed and mixed with a single pressure line treatment agent by a single mixer. The volumetric flow rates of the mixed materials to be mixed are typically small, whereby the required equipment is small.

The injection apparatus 10 comprises two pressable members to be loaded against one another, a first roll 14 and a second roll 24. The pressing members 14, 24 form a nip 15 between them. The injection apparatus comprises a The paper or board web W is led to the press nip 15 after the treatment agent mixture has been sprayed onto the web. The injection apparatus 10 comprises first injection nozzles in a first injection bar 11 and second injection nozzles in a second injection bar 21. For example, the web may be treated with an adhesive mixture or coated unilaterally by the first injection nozzles or second injection nozzles or second injection nozzles. It is also possible to use a belt as a clamping member. Preferably, the belt is guided through a roll nip.

Injection apparatus 10 is provided with a single machine rotation 20 comprising a machine container 1 for treating agent and a supply pipeline for transferring the treatment agent from the machine container to the injection process. The treating agent is mixed in the machine tank 1 with the desired basic composition and basic viscosity prior to treatment by introducing the mixture into a feed line leading to the injection nozzles. The treatment tank and the dilution water can be supplied to the machine tank 1 via the inlet pipe 2. The inlet tube may be fed with a treatment agent, for example, from a treatment tank storage tank, and warm dilution water may be mixed into the machine tank.

The feed pipe comprises a feed pipe 3 for introducing the treatment agent from the machine tank to the pressure pump 4 provided by the injection equipment. Preferably, the treatment agent mixture, such as the adhesive mixture, is pumped through the pressure screen 6. The supply piping comprises a first pressure pipe 5 for supplying the treatment agent from the pressure pump 4 to the pressure screen 6. In addition, the supply piping comprises a second pressure pipe 7 which runs from the pressure screen 6 to the injection means 11,21.

The machine rotation 20 is common to the first and second injection means until the supply piping, preferably the second pressure pipe 7, is divided into individual pressure lines 12, 22 to which mixing lines 13 ', 23' are connected and the static mixers 13, 23 as mixing means. injection means so that the composition and / or viscosity of the treatment agent mixture to be applied to each injection means can be individually altered.

The injection apparatus 10 comprises a pressure measurement in a pressure duct after a pressure screen 6, preferably a first pressure measurement 16 in a first pressure duct 12 and a second pressure measurement 26 in a second pressure duct 22. The injection apparatus 10 may comprise a second viscosity measurement and / or a second pressure measurement in the second pressure duct 22. Dilution of the treatment agent mixture to the injection beams 11, 21 may be calculated based on pressure, flow and / or viscosity measurement. When measuring the flow to the beam and the return flow from the beam, it is known how much glue has been applied to the web. Dilution water 13 ', 23' to the injection beams may be added to the line after the pressure screen according to the calculated dilution need.

After dilution, separate viscosity measurements may also be provided for each of the spray beams 11, 21. Dilution of the treatment agent mixture to the spray beams may be provided by dilution 13 ', 13; 23 ', 23 adjusted by an optional viscosity measurement (not shown).

The single-machine feed piping can also be divided into more than two branches to form individual pressure lines at the end of the feed. In other words, the supply piping may be branched to a plurality of injection means, such as, for example, injection beams. In one exemplary case, one first injection means is provided on one side of the fibrous web and on the other side two second injection means in succession. One machine cycle can thus feed more injection beams, which can also be larger than the three pieces shown in this example.

Machine rotation 20 comprises a return cycle. The machine rotation is also common to the first and second injection means for the return cycle after the injection event.

The return cycle comprises a return pipe 8 leading back to the machine tank 1. The return cycle comprises a first return line 31 leading from the first injection beam 11 to the return pipe 8, and a second return line 32 leading from the second injection beam 21 to the return pipe 8. Either one or spray bar at both ends. The low return flow from the spray bar may be necessary because the end of the spray tube tube containing the spray nozzles will not be flow-free, e.g., returning water or toner back to the machine tank will not significantly interfere with the process. For example, when staining is used, the return cycle can be closed or substantially reduced so that the toner does not change the color of any liquid in the machine container. Injection equipment and injection method has an advantage of embodiments in connection with the different sides of the individual treatments fiber web, for example, one-sided dyeing or different dry matter content between the different sides can be used for one machine cycle for ruiskutuspalkkeja each half, which lowers costs and reduces space requirements. When using specialty chemicals, the harm caused by recycling them can be reduced. If special chemicals are used, the return cycle can be closed. Dilution of the detergent mixture due to continuous recycling of specialty chemicals can be avoided.

The treatment medium recovered from the injection process can also be recycled back to the machine container 1 via the return pipe 8. The return cycle comprises a collecting tube 33 and a mist separator 34. The recovered liquid and misty treatment medium is led along the collecting tube 33 to a mist separator 34, which may be a cyclone. After the mist separator, the liquid treatment agent is introduced into the return pipe and the mist treatment agent can be introduced into the mist washing apparatus 40 via the mist passage 41. Liquid form treatment agent from the fog washer 40 may be returned to the machine container 1 via a return line 8.

The following is an example of controlling the amount of starch, i.e. the dry matter of the adhesive. In the machine tank, the solids content of the blend is 15%. At a dry solids content of 15% and 10%, the diluent mixture is divided into the first spray bar 11 and the second spray bar 21. The diluent mixture supplied to the first spray bar 11 is not diluted. Dilution water is supplied to the second injection line 22 to the second injection beam 21 through a second supply means 23 '(second mixing tube) and mixing the dilution water in the second mixing means 23 (second static mixer) to achieve a dry solids content of 10%. For both injection beams 11, 21, the return flow 31, 32, 33 would be 10% of the total (15% of the dry matter and 10% of the total dry matter), i.e., a total of 20% of the average of 12.5% dry matter. The machine container 1 receives 80% of the total amount discharged through the inlet 2 through the inlet pipe at a dry matter content of 15%. As a result, the treatment tank mixture 1 of the machine container 1 is slightly diluted, which can be compensated by increasing the dry substance content of the treatment agent mixture fed to the machine container.

For example, the mixing of steam into the pressure line 12, 22 has been found to practically heat the treating mixture but not to dilute much. Similarly, when steam is used as a dopant, the machine tank 1 is fed continuously with the amount leaving the web at 100% to 15% solids, i.e. the starch in the machine tank is slightly diluted, which is compensable.

The foregoing description provides non-limiting examples of some embodiments of the invention. However, it will be apparent to one skilled in the art that the invention is not limited to the details set forth. Some features of the embodiments shown may be utilized without the use of other features.

The foregoing description is to be construed as merely describing the principles of the invention and not limiting the invention. Thus, the scope of the invention is limited only by the appended claims.

Claims (27)

An injection apparatus (10) for a fibrous web (W), comprising a first injection means (11) comprising injection nozzles for a first side of the fibrous web and a first pressure line (12) for supplying treatment material to the first injection means; and a second pressure line (22) for supplying the treatment agent to the second injection means, for spraying the treatment mixture directly on one or both surfaces of the fibrous web by one or more injection means, characterized in that the injection device (10) comprises injection and mixing means (13, 13 '); which are connected to respective ruiskutusvälinekohtaisiin pressure lines (12, 22) in such a way that the fiber web on both sides of ruiskutusvälinekohtaiseen pressure line is connected to one or more of the blend into a tool, the alloy and mixing with one or more feed and mixing means. The injection device according to claim 1, characterized in that the injection device (10) comprises a first supply and mixing means (13, 13 ') connected to a first pressure line (12) and / or a second supply and mixing means (23, 23'). ) connected to the second pressure line (22). Injection device according to Claim 1 or 2, characterized in that the injection device (10) is configured to change the composition of the treatment medium to be supplied on the first and / or second pressure line (12, 22) before the injection nozzles. Injection device according to one of Claims 1 to 3, characterized in that the injection device (10) has a single machine cycle (20) comprising one machine container (1) and an inlet piping leaving the machine container for supplying the treatment agent to the first pressure line (12) and / or (22). Injection device according to one of Claims 1 to 4, characterized in that the first pressure line (12) and the second pressure line (22) are formed by dividing the supply piping from the machine tank (1) to the first and second injection means (11, 21) into two pressure lines. Injection device according to claim 5, characterized in that the first pressure line (12) and the second pressure line (22) are divided in a pressure pipe (7) after the pressure screen (6) comprising the injection device. The injection device according to any one of claims 1 to 6, characterized in that the injection device comprises one or more first pressure lines (12) for supplying the treatment agent to one or more first injection means (11), and the injection device comprises one or more second pressure lines (22) one or more other spraying means (21), Injection device according to one of Claims 1 to 7, characterized in that the supply and mixing means comprise as a supply means a duct (13 ', 23') for supplying the diluent to the pressure line. Injection device according to one of Claims 1 to 8, characterized in that the feeding and mixing means (13, 23) comprises a static mixer as a mixing means. Spraying device according to one of Claims 1 to 9, characterized in that the spraying device comprises a pressure screen (6) and a pressure medium (16, 26), a flow measurement and / or a viscosity measurement of the treatment agent mixture arranged in the pressure channel (12). 22). Injection device according to one of Claims 1 to 10, characterized in that the injection device comprises a pressure measurement (16, 26), a flow measurement and / or a viscosity measurement of the treatment mixture, which is arranged in the pressure channel (12, 22) inlet and mixing means (13, 23). ). Spraying equipment according to one of Claims 1 to 11, characterized in that the spraying equipment is configured to mix one or more of the following into the first and / or second pressure line: diluent, steam, gas, solid, starch, native starch, pigment, dye, carbon dioxide, specialty chemicals. Injection device according to one of Claims 1 to 12, characterized in that a plurality of feed and mixing means are arranged on the first and / or second pressure line, such that one feed and mixing means is configured to feed and mix one or more mixing agents at a time. Injection device according to one of Claims 1 to 13, characterized in that the injection device comprises a pressing nip (15) arranged in the direction of the fiber web following the injection means (11, 21) for pressing the treatment agent mixture onto the fiber web. An injection method for a fibrous web (W), the method comprising treating the fibrous web (W) with an injection apparatus (10) comprising: a first injection means (11) comprising injection nozzles for a first side of a fibrous web and a first pressure line (12) an injection means (21) comprising injection nozzles for one side of the fibrous web and a second pressure line (22) for supplying the treatment agent to the second injection means, and the treatment mixture being sprayed directly and mixing means (13, 13 '; 23, 23') which are connected to respective ruiskutusvälinekohtaisiin pressure lines (12, 22) in such a way that the fiber web on both sides of ruiskutusvälinekohtaise one or more feed mixing means are connected to the pressure line, and in the method, the mixing agent is fed and mixed with one or more feed and mixing means into the treatment medium. Method according to claim 15, characterized in that the injection device (10) comprises a first feed and mixing means (13, 13 ') connected to the first pressure line (12) and / or a second feed and mixing means (23, 23'). ) connected to the second pressure line (22). Method according to Claim 15 or 16, characterized in that the composition of the treatment medium to be supplied on the first and / or second pressure line is changed before the injection nozzles. A method according to claim 17, characterized in that the treatment medium is supplied to the first pressure line (12) and / or the second pressure line (22) by a single machine cycle (20) of the injection apparatus (10) comprising one machine tank (1) and a feed pipe from the machine tank. Method according to one of Claims 15 to 18, characterized in that the first pressure line (12) and the second pressure line (22) are formed by dividing the supply piping from the machine tank (1) to the first and second injection means (11, 21) into two pressure lines. Method according to one of Claims 15 to 19, characterized in that the first pressure line (12) and the second pressure line (22) are divided from the pressure pipe (7) after the pressure screen (6) comprising the injection equipment. A method according to any one of claims 15 to 20, characterized in that alloying agent (13, 23) is supplied to the pressure line (12, 22) by a feed and mixing means (13, 23 '). Method according to one of Claims 15 to 21, characterized in that a mixing agent (13, 23) is provided in the pressure line (12, 22) by means of a feed and mixing means comprising a static mixer as a mixing means. Method according to one of Claims 15 to 22, characterized in that the pressure of the treatment agent mixture is measured by pressure measurement (16, 26), flow by flow measurement and / or viscosity by viscosity measurement arranged in a pressure duct (12, 22) ). Method according to one of Claims 15 to 23, characterized in that the pressure of the treatment medium mixture is measured by a pressure measurement (16, 26), a flow measurement and / or a viscosity measurement by a viscosity measurement arranged in the pressure channel (12, 22). , 23). Method according to claim 23 or 24, characterized in that the feed of the alloying agent is controlled by the feed and mixing means on the basis of pressure, flow and / or viscosity measurement. A process according to any one of claims 15 to 25, characterized in that the first and / or second pressure line is admixed with one or more of the following: diluent, steam, gas, solid, starch, native starch, pigment, colorant, carbon dioxide, chemical, specialty chemical. Method according to one of Claims 15 to 26, characterized in that the injection apparatus (10) comprises a pressing nip (15) arranged in the direction of travel of the fiber web after the injection means (11,21), and the method compressing the treating mixture onto the fiber web.