CN103711038B

CN103711038B - Manufacture the method for fiber web and manufacture the configuration of fiber web

Info

Publication number: CN103711038B
Application number: CN201310467563.7A
Authority: CN
Inventors: 雷约·皮耶蒂凯宁; 托皮·廷屈宁
Original assignee: Valmet Technologies Oy
Current assignee: Valmet Technologies Oy
Priority date: 2012-10-09
Filing date: 2013-10-09
Publication date: 2016-06-01
Anticipated expiration: 2033-10-09
Also published as: CN103711038A; EP2719826A1

Abstract

The present invention relates to the method for the manufacture of fiber web, in the method undertaken by the top sizing of web, sizing agent is applied on this fiber web. This sizing agent comprises the mixture of at least two kinds of different starch solutions, and heats before or after top sizing or in the process of top sizing and/or this fiber web dry. The present invention also relates to the configuration for the manufacture of fiber web. For the manufacture of the configuration of fiber web (W) be included in fiber web on the surface applying portion comprise the sizing agent of native starch device (11) and for the device (10 of heating and/or dry this web (W); B).

Description

Manufacture the method for fiber web and manufacture the configuration of fiber web

Invention field

The present invention relates generally in fiber web machine, manufacture fiber web. More specifically, the present invention relates to the configuration of the method for preamble according to claim 1 and preamble according to claim 7.

Background of invention

As known in the art, in fiber web manufacture method, usually comprise the assembly being made up of the multiple equipment being arranged in production line continuously. Typical produce and process line comprises head box, net portion and press part and dryer part subsequently and take-up mechanism. This production and process line can comprise other device for this fiber web of finishing and portion further, such as sizing applicator, rolling press, coating portion. This production and process line also comprise at least one for the formation of user volume rewinding machine and coil packing equipment. In this specification sheets and appended claims, fiber web refers to such as paper width and board web.

In the production of fiber web (such as paper width or board web), applying glue is used for by adding sizing agent, and such as glue chemical (gluechemicals) changes the character of fiber web. Applying glue can be divided into internal sizing and top sizing. In internal sizing, before forming sizing agent is added in the paper pulp of wet end of fiber web machine. In top sizing, sizing agent is added on the surface of fiber web by the dry end at fiber web machine. With the use of different types of chemical treatment to affect liquid such as water to the infiltration in fiber web, thus carry out internal sizing when the wet end of fiber web machine starts.

In the production of fiber web (such as paper width or board web), top sizing is used for by adding sizing agent, and such as starch or other glue chemical change the character of fiber web. In top sizing, sizing agent is added on the surface of fiber web by the dry end at fiber web machine. Top sizing is used for the manufacture of multiple fiber web grade (such as uncoated fine papers and several board grades). The applying glue of paper width and board web utilizes independent sizing applicator usually. In sizing applicator, the configuration of prior art adopts different types of application techniques, such as pond application techniques (pondsizingtechnology) or film transfer techniques or spraying applications technology. WO03/004770A1 discloses another kind of method of paper width or the board web manufacturing top sizing, the method comprises and is applied at least side of web by water-based sizing material, and according to the method, the solid content of the sizing material applied is at least 15 weight %, and is applied on the side of web to be not more than the amount of 5 grams/m by this sizing material to be applied to the water-based sizing material form of web. Wherein, as a kind of coating device being applicable to disclosed method in this patent disclosure, it is noted that spray coater. In addition, WO2006/058961A1 discloses method and the configuration for the treatment of paper width or board web or like fibrous web. In the prior art method, the mixture exhibition of applying will be processed on the surface of this web with spray nozzle. In the method, pending web is guided by press. nips and is directed between the roller in this nip. Before this web enters nip, the exhibition of being applied by the process mixture measured like this is at least side of web so that process mixture is still moist when it enters nip. In the prior art arrangement of this patent disclosure, this configuration packet is containing at least one press. nips, for and being used for applying the element opening up this process mixture to the element of press. nips by this ribbon of web, and the element for this process mixture of deposited exhibition is fog nozzle, and this fog nozzle is to arrange apart from the adjustable distance of this press. nips on the arrival direction of web, so as this process mixture to be fed to this web at least one on the surface.

In use size presser so that, in the top sizing improving web strength, the solid content of this web must be enough high to realize the good operating performance of this web and the infiltration of cooking starch. Therefore, the solid content of this web is at least 90 weight % before top sizing, and level of solids is reduced to 70 weight % or even lower by this. The low-solid content of this web causes runnability problems, and web can be caused to break.

Disclosing a kind of method of paper applying web or sheet-form in patent disclosure GB333,226, it comprises the water paste applying to contain uncooked amylum on it, and makes moist coating paper contact with water vapor. In the method, this water paste can also contain pigment, and when can not fully dry this coating paper is imposed enough heat with this starch of gelling, and dry and this coating paper of finishing. Under the existence of suff water, coating paper is heated to gelation temperature to realize the gelling of this starch. This wet coating cloth paper can contact with water vapor or contact with saturated or slightly overheated water vapor. Only use uncooked amylum as the tackiness agent in coating in the method.

Public announcement of a patent application DE102008040057 discloses the method for the surface treatment (preferred surface applying glue) of a kind of material web (materialweb) (preferred paper or cardboard). The method comprises the starch using coating device to apply to contain surface treatment agent on the designated surface of this material web with predetermined dose film (pre-dosedfilm) form. This starch is heat-chemistry treated starch, and when compared with native starch viscosity, the solid content of surface treatment agent reduces. Its object is to reduce the needs to this material web dry after top sizing.

In internal sizing, it is possible to add the sizing agent of the highest about 2 weight %, because the sizing agent adding a large amount at wet end can reduce the dry property of this web because moisture penetrates in starch granules in drying process. Known in internal sizing, use native starch (i.e. uncooked amylum, namely do not boil starch), but its maintenance rate is too low, as described only up to 2 weight %. In order to improve this maintenance rate, it may also be useful to retention aid. Native starch is used as sizing agent in single web, but it can also be used for multi-layer forming to improve the bonding of layer.

Native starch forms the ability of hydrogen bond based on the existence of heat and moisture, and this can make starch granules expand, and the moisture thus permeated produces hydrogen bond. By this moisture of thermal evaporation, and stable key can also be generated when starch is dry.

In top sizing, the starch that do not boil (i.e. native starch) or have the full-bodied starch that boils and be retained in web on the surface, thus can not improve the internal intensity of web. In order to make the fiber of starch and this web produce strong bonding, the gelling of this native starch needs the temperature of 55-86 DEG C.

Owing to starch easily precipitates, produce hard and concentrated mixture, apply native starch with high density and also have problems.

Invention general introduction

An object of the invention is to provide a kind of method manufacturing fiber web and the configuration manufacturing fiber web, wherein can eliminate or at least problem of minimumization prior art and shortcoming.

In order to those problems solved the problem and will occur subsequently, the method of the present invention is the method manufacturing fiber web, in the method undertaken by the top sizing of web, being applied to by sizing agent on this fiber web, this sizing agent comprises the mixture of at least two kinds of different starch solutions. Such as, this mixture comprises the starch solution having full-bodied starch solution He having low viscosity. The present invention is configured to the configuration for the manufacture of fiber web, should comprise the device for applying sizing agent (11) for the manufacture of the configuration of fiber web (W), and described sizing agent is the mixture of at least two kinds of different starch solutions.

According to the present invention, in the method being manufactured fiber web by the top sizing of web, sizing agent is applied on fiber web, this sizing agent comprises the mixture of at least two kinds of different starch solutions, and this mixture comprises at least one and has full-bodied starch solution and a kind of starch solution with low viscosity. This starch mixture has low viscosity, advantageously for being less than 100mPas(Br100), which improve the applying glue of the starch mixture of high-content of starch (such as starch content is 8-20 weight % solid content).

As a kind of starch solution, this mixture preferably comprises native starch, and namely do not boil starch and water.

According to an aspect of the present invention, this sizing agent mixture preferably comprises natural, the starch solution namely not boiled and the starch solution boiled. Advantageously, the 30-70 weight % of this starch content is native starch, and the 30-70 weight % of this starch content is the starch boiled. During applying glue, the temperature of this mixture keeps below the gelation temperature of 30-55 DEG C. By mixing native starch solution and the starch solution that boils, obtaining the stabilized mixture with high density, it is not concentrated in the pipeline of this device or on the bottom of this container.

By changing the ratio of starch solution, the sizing material content of this web can regulate on the thickness direction of web.

One of starch solution can also serve as the load agent of hydrophilic agent, white dyes etc., particularly when wanting the surface properties changing this web.

This sizing agent can also comprise for improving web surface or make the fines (fines) of web surface colour.

Advantageously, according to an aspect of the present invention, this sizing agent mixture comprises natural, and namely do not boil starch solution and the solution boiled. According to this aspect of the invention, before mixing the solution of natural and the starch that boils, this native starch is distributed in the alkaline solution (lyesolution) of 0.1-0.5 weight %. Thus, the gelation temperature of native starch is reduced to desired level, and thus realizes rapid reaction and premature gelation, thus for longer time, more moisture and more heats are created in applying glue reaction.

A kind of favorable characteristics according to the present invention, regulates this viscosity. Such as, the mixture of pearl starch, borax, caustic soda and water can be suspended in the thickener of the starch that boils. Add caustic soda and contribute to this starch of gelling. Increase based on the amount of the caustic soda of whole starch will reduce the gelling temp of whole tackiness agent. The chief value of borax is the caustic soda existed in buffering formula. It also offers viscosity controller is also that finished product tackiness agent increases viscosity. Usually, the starch of 15-20 weight % had the carrier boiling to be provided for pearl starch in the part water of caustic alkali completely. Starch solids content is generally 23-35 weight % to realize the finished product adhesive viscosities of 30-50SteinHall second. This tackiness agent is applied to corrugation top and after heating, pearl starch in-situ gelling. When starch expands and gelling starts, form wet bonding intensity. The waved plate of nearly all present manufacture is all bonding with starch-based adhesive. Owing to quality and the adhesive property of starch directly affects final board quality, make the decision about starch in this process care should be used to and treated as material particular.

According to the present invention, the configuration manufacturing fiber web be included in fiber web on the surface applying portion comprise the device of the sizing agent of native starch, with for heating and/or the device of this web dry.

Advantageously, the device applying sizing agent is microjet or film or bonding (bond) or spraying applications device.

Advantageously, it is that belt drying and/or cartridge type be dry for device that is dry and/or heating and/or infrared drying and/or air borne drying and/or steam drying and/or other drying installation well known by persons skilled in the art.

A favorable characteristics according to the present invention, as applying glue nip, the travelling belt nip (beltnip) of heating or roll nip (rollnip) are for the gelling of starch before it is dried.

A favorable characteristics according to the present invention, in the configuration, apply its be at least two kinds of different starch solutions mixture sizing agent device after arrange scraper or excellent so that the sizing agent making applying becomes level and smooth.

A favorable characteristics according to the present invention, this configuration packet is containing the device for directly applying native starch solution after applying glue, and such as this configuration packet is containing the spraying plant without nip.

A favorable characteristics according to the present invention, the position that applying portion comprises the device of the sizing agent of native starch is positioned at the net portion of this fiber web production line, press part or dryer part. Applying the device of sizing agent it is even possible that be positioned at head box portion, the device such as applying sizing agent can be the water-jet of two (dual) head box.

The present invention can be used for manufacturing different fiber web grades, such as boxboard. Advantageously this fiber web is carried out internal sizing.

Many advantages can be realized: such as can be optimized the intensity of this web and/or surface strength and/or rigidity by rationed starch solution by the present invention, such as can boil the more cheap native starch of starch to reduce material cost with the use of the ratio of more vast scale, and the surface of such as this web can by filling with native starch and/or coating and/or its applying glue is come modification.

According to one embodiment of present invention, this sizing agent is applied in treatment zone or before being about to enter treatment zone, and in this treatment zone, this web is through being stressed and thermal treatment. This sizing agent is applied by spraying applications device and corresponding spraying plant, and web is directed to and is formed in roller or the nip between cylinder and travelling belt (being advantageously metal strip). In this nip, this travelling belt is for sizing agent offer surface pressure is so that it penetrates in web. This travelling belt provides heating to web surface simultaneously, thus evaporates moisture, and the temperature of sizing agent is increased to and exceedes gelation temperature. Moisture evaporation also makes this sizing agent penetrate into further in web. In this embodiment, in closed web transport process (closedwebtransfer), at least one surface this web is carried out top sizing with the sizing agent mixture of at least two kinds of different starch solutions as explained above. In this embodiment, this travelling belt can heat or do not heat, and this roller or cylinder also can provide heat. This web can by textile support, and the unifaciality produced by this fabric can be used for producing the character of final fiber web product, or it can by coating and/or press polish modification. This fabric can also be porous so that it absorbs moisture. This fabric can also provide coating to reduce web adhesive power. This roller or cylinder can also provide suction unit to improve moisture removal and sizing agent infiltration. Applying glue device such as can be connected with the press part of fiber web production line, dryer part, metal strip drying installation, applying glue press, rolling press or take-up mechanism with the position for the treatment of zone.

Another example according to the present invention, before the dryer part of fiber web production line, the sizing agent mixture comprising at least two kinds of starch solutions is applied in this web, the solid content of this fiber web after applying sizing agent is made lower than 80 weight % and thus to there is a large amount of moisture, this moisture evaporates due to the heat for the treatment of zone (this web in treatment zone through being stressed and thermal treatment), and activates this sizing agent. Temperature in treatment zone makes to reach gelation temperature, such as 60-85 DEG C, is advantageously 80-100 DEG C, and drying is effective, produces bonding by this sizing agent, improves the intensive property of this web. Treatment time in treatment zone, if using fabric, this pressure was 2-20kPa advantageously for more than 50ms, when using metal strip wherein, the surface pressure in treatment zone is 20-500kPa. It can be refrigerating unit behind treatment zone.

Accompanying drawing explanation

Hereinafter, with reference to accompanying drawing, the present invention is described more in detail, wherein:

Fig. 1 schematically illustrates the example boiled with mixing starch.

Fig. 2 A-2G schematically illustrates the example of starch microstructure in W-Gum gelling process.

Fig. 3 schematically illustrates an example of the configuration of the present invention.

Fig. 4 schematically illustrates another example of the configuration of the present invention.

Detailed Description Of The Invention

Schematically illustrate the example boiled with mixing starch in FIG. How the microstructure showing the starch when temperature raises and reduces in the left side of figure changes, and how the starch property in the process with mixing starch that boils develops. At the temperature of 20 DEG C, it is still that the viscosity of the starch of slurry form raises, when starch temperature is 55-85 DEG C, starch granules is attached to waterborne, and this particle starts to expand, decrease in viscosity simultaneously, until reaching the temperature of 95 DEG C, starch is solution form after this. In temperature by, in 95 DEG C of processes being reduced to 20 DEG C, viscosity raises, starch chain associates. According to the present invention, by the mixing of two kinds of starch solutions, a kind of from the section of not boiling 30 and at the temperature of 20 DEG C, there is high viscosity, a kind of from the section of boiling 40 and at the temperature of 95 DEG C, there is low viscosity, the two mixes in the mixing section 50 that temperature is 55 DEG C. Subsequently, the starch agent of two kinds of starch solution form of mixtures applies in applying glue process 60, in this process by the energy by the dry acquisition in fiber web and dryer section by this starch gelling, and produces strong bonding. Before natural in section 30,40 and the starch solution that boils being mixed, native starch is distributed to 0.1-0.5 weight %(NaOH) alkaline solution in. The desired level that thus gelation temperature of native starch is reduced to 60 DEG C, and thus realize rapid reaction and premature gelation, by this for longer time, more moisture and Geng Duo heat are created in applying glue reaction.

Fig. 2 A-2G schematically illustrates the example of the starch microstructure in W-Gum gelling process when temperature is increased to 90 DEG C by 30 DEG C. As can be seen from this figure, first, starch starts to expand, and by the gelation temperatures of about 65 DEG C, dispersion starts.

In figures 3-4, unless mentioned separately, identical Reference numeral is used for consistent parts, assembly or part assembly.

In the illustrative examples of Fig. 3, fiber web W is supported by fabric F. On this fiber web, apply to comprise the sizing agent mixture of at least two kinds of starch solutions by applying glue device 11, subsequently, this web is directed in the nip being formed between the cylinder 10 of heating and travelling belt B or treatment zone. Guide roll 13 guides this travelling belt B, provides further pressure by roller 12 in treatment zone.

In the illustrative examples of Fig. 4, by applying glue device 11, the sizing agent mixture comprising at least two kinds of starch solutions is applied on this fiber web, subsequently, this web is directed in the nip being formed between heating drum 10 and travelling belt B or treatment zone. Guide roll 13 guides this travelling belt B. This embodiment comprises three applying glue devices 11 and three treatment zones.

Embodiment

The method of the present invention employ the native corn starch SyralIberiaS.A.UMeritena100 (coming oneself Thereos company) not boiled and boil C* film 07325 (from the C*Film07325 corn dextrin of Cargill company, its through manufacturers pre-treatment and without the need to carrying out ferment treatment) mixture. The native starch NaOH pre-treatment that this does not boil to be reduced to 60 DEG C by gelation temperature. Being mixed with water and be diluted to solid content by this by this C* film 07325 is 20 weight %, thereafter by its boiling in the jet cooker of 80 DEG C. The C* film 07325 of the Syral not boiled with water and boiling is mixed, wherein the solid content of the mixture of these two kinds of starch is 15 weight %, temperature is 50 DEG C, and the viscosity measured by Bu Luke Fil moral viscosimetry (rotating speed is 100rpm) is 13mPas. This mixture contains the C* film 07325 of the boiling of Syral that 50 weight % do not boil and 50 weight %. By this mixture being applied on the corrugated cardboard of 100 grams/m with jet-type sizing applicator. The applied amount of this mixture is 2 grams/m, every face (with dry gauge).

In contrast, by boiling 10 minutes in the batch cooking pot (batchcooker) of 85 DEG C and boiling after 130 DEG C (post-cooked) Syral of 2 minutes be applied on identical base cardboard (baseboard) with identical applied amount (with the dry gauge of starch). The temperature of the Syral starch of this applying is 84 DEG C, and the viscosity measured by Bu Luke Fil moral viscosimetry (rotating speed is 100rpm) is 72mPas, and solid content is 20.2 weight %.

Applied amount is the strength property that the uncooked native starch in 2 grams/m, every face and the mixture of cooking starch and applied amount are all the native starch of the boiling in 2 grams/m, every face, as interfacial bonding strength (Huygen), bursting strength (burst), SCT (the compression test of short square) md/cd and CMT (Kang Kela flat compressed intensity) locate equal level.

Claims

1. manufacture the method for fiber web, in the method undertaken by the top sizing of web, sizing agent is applied on this fiber web, it is characterized in that, this sizing agent comprises the mixture of at least two kinds of different starch solutions, the mixture of this starch solution comprises the starch solution having full-bodied starch solution He having low viscosity, this has full-bodied starch solution is native starch, i.e. uncooked amylum, namely do not boil starch, with a kind of starch solution that water is formed, this has the starch solution of low viscosity is the starch solution boiled, wherein in applying glue process, the temperature of this mixture remains between 30-55 DEG C, described temperature is lower than gelation temperature.

2. the method for claim 1, it is characterised in that in this sizing agent, the 30-70 weight % of starch content is native starch, and the 30-70 weight % of starch content is the starch that boils.

3. the method for claim 1, it is characterised in that heating and/or this fiber web dry before or after top sizing or in top sizing process.

4. for the manufacture of the configuration of fiber web, it is characterized in that comprising the device for applying sizing agent (11) for the manufacture of the configuration of fiber web (W), described sizing agent is the mixture of at least two kinds of different starch solutions, the mixture of this starch solution comprises the starch solution having full-bodied starch solution He having low viscosity, this has full-bodied starch solution is native starch, i.e. uncooked amylum, namely do not boil starch, with a kind of starch solution that water is formed, this has the starch solution of low viscosity is the starch solution boiled.

5. configure as claimed in claim 4, it is characterised in that the configuration for the manufacture of fiber web (W) comprises for the device (10 of heating and/or dry this web (W); B).

6. configure as claimed in claim 4, it is characterised in that the device applying sizing agent is microjet or film or bonding or spraying applications device.

7. configure as claimed in claim 5, it is characterised in that be that belt drying and/or cartridge type be dry for device that is dry and/or heating and/or infrared drying and/or air borne drying and/or vapor drying plant.

8. configure as claimed in claim 4, it is characterised in that in the configuration, it may also be useful to the travelling belt nip of heating or the roll nip of heating are with jelling starch before it is dried.

9. configuring as claimed in claim 4, it is characterised in that in the configuration, the device (11) at the sizing agent for applying its mixture being at least two kinds of different starch solutions arranges that scraper or rod are so that the sizing agent making applying becomes level and smooth afterwards.

10. configure as claimed in claim 4, it is characterised in that this configuration also comprises the device for applying native starch solution after applying glue immediately.

11. configure as claimed in claim 4, and this configuration of its feature also comprises the spraying plant without nip.

12. configure as claimed in claim 4, it is characterised in that the treatment zone that this configuration packet is contained in roller (10) or is formed between cylinder and travelling belt (B).