EP3231936A1 - Method for producing fiber webs and production line for producing fiber webs - Google Patents
Method for producing fiber webs and production line for producing fiber webs Download PDFInfo
- Publication number
- EP3231936A1 EP3231936A1 EP16164657.5A EP16164657A EP3231936A1 EP 3231936 A1 EP3231936 A1 EP 3231936A1 EP 16164657 A EP16164657 A EP 16164657A EP 3231936 A1 EP3231936 A1 EP 3231936A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber web
- drying
- production line
- fiber
- calender
- 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
- 239000000835 fiber Substances 0.000 title claims abstract description 127
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 46
- 238000001035 drying Methods 0.000 claims abstract description 68
- 238000003490 calendering Methods 0.000 claims abstract description 33
- 238000000034 method Methods 0.000 claims abstract description 16
- 238000001816 cooling Methods 0.000 claims abstract description 7
- 238000001704 evaporation Methods 0.000 claims abstract description 5
- 230000008020 evaporation Effects 0.000 claims abstract description 5
- 239000012080 ambient air Substances 0.000 claims abstract description 4
- 239000011248 coating agent Substances 0.000 claims description 27
- 238000000576 coating method Methods 0.000 claims description 27
- 239000010410 layer Substances 0.000 claims description 19
- 239000007795 chemical reaction product Substances 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 3
- 239000011247 coating layer Substances 0.000 claims description 3
- 238000012545 processing Methods 0.000 claims description 3
- 239000008107 starch Substances 0.000 claims description 3
- 235000019698 starch Nutrition 0.000 claims description 3
- 239000000123 paper Substances 0.000 description 37
- 239000007789 gas Substances 0.000 description 15
- 229920001131 Pulp (paper) Polymers 0.000 description 12
- 238000004806 packaging method and process Methods 0.000 description 5
- 239000000945 filler Substances 0.000 description 4
- 238000007639 printing Methods 0.000 description 4
- 239000007921 spray Substances 0.000 description 4
- 239000011098 white lined chipboard Substances 0.000 description 4
- 239000003570 air Substances 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 240000000486 Lepidium draba Species 0.000 description 2
- 235000000391 Lepidium draba Nutrition 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 238000013459 approach Methods 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 239000011086 glassine Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003020 moisturizing effect Effects 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- 229920001296 polysiloxane Polymers 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 239000012858 resilient material Substances 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 239000011099 solid bleached board Substances 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
- D21G1/0073—Accessories for calenders
- D21G1/0093—Web conditioning devices
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F9/00—Complete machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F5/00—Dryer section of machines for making continuous webs of paper
- D21F5/18—Drying webs by hot air
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G1/00—Calenders; Smoothing apparatus
Definitions
- present invention relates to producing fiber webs in a fiber web production line, in particular to producing board webs. More especially the present invention relates to a method according to preamble part of claim 1 and to a production line according to preamble part of claim 8.
- a typical production and treatment line comprises a head box, a wire section and a press section as well as a subsequent drying section and a reel-up.
- the production and treatment line can further comprise other devices and/or sections for finishing the fiber web, for example, a pre-calender, a sizer, a final-calender, a coating section.
- the production and treatment line also typically comprises at least one slitter-winder for forming customer rolls as well as a roll packaging apparatus or a sheet cutter.
- fiber webs are meant for example a paper and board webs.
- thermal energy is provided to the fiber webs by contact, for example by drying cylinders; by convection, for example by impingement dryers; by condensation of steam on the surfaces of the fiber webs, for example by steam boxes; by radiation, for example by infrared dryers.
- drying temperature of the fiber web increases and thus partial pressure of steam in the fiber web increases.
- Difference of partial steam pressures in the fiber web and the ambient air seeks to even out, whereby the fiber web evaporates moisture and dries.
- efficiency of the traditional drying in particularly when using drying cylinders) decreases, due to small temperature difference and small heat flow.
- the nips are formed between a smooth-surfaced press roll such as a metal roll and a roll coated with resilient material such as a polymer roll or between two smooth-surfaced rolls.
- the resilient-surfaced roll adjusts itself to the forms of the web surface and presses the opposite side of the web evenly against the smooth-surfaced press roll.
- the nips can be formed also by using instead one of roll a belt or a shoe as known from prior art.
- Mechanical-pulp based, i.e. wood-containing printing papers include newsprint, uncoated magazine and coated magazine paper.
- DIP deinked pulp
- TMP mechanical pulp
- DIP based newsprint may contain up to 20 % filler.
- the filler content of a virgin-fiber based newsprint furnish is about 8 %.
- MFC paper machine finished coated
- basis weight 48 - 70 g/m 2 Hunter gloss 25 - 40 %
- PPS S10 roughness 2.2 - 2.8 ⁇ m PPS S10 roughness 2.2 - 2.8 ⁇ m
- density 900 - 950 kg/m 3 brightness 70 - 75 %
- opacity 91 - 95 % opacity 91 - 95 %.
- MWC paper medium weight coated
- basis weight 70 - 90 g/m 2 Basis weight 70 - 90 g/m 2
- Hunter gloss 65 - 70 % PPS S10 roughness 0.6 - 1.0 ⁇ m
- density 1150 - 1250 kg/m 3 brightness 70 - 75 %
- opacity 89 - 94 % opacity 89 - 94 %.
- Typical values are for uncoated WFU Copy paper: grammage 70 - 80 g/m 2 , Bendtsen roughness 150 - 250 ml/min and bulk > 1.3 cm 3 /g; for uncoated offset paper: grammage 60 - 240 g/m 2 , Bendtsen roughness 100 - 200 ml/min and bulk 1.2 - 1.3 cm 3 /g; and for color copy paper: grammage 100 g/m 2 , Bendtsen roughness ⁇ 50 ml/min and bulk 1.1 cm 3 /g.
- Typical values for supercalendered release papers are basis weight 60 - 95 g/m 2 , caliper 55 - 79 ⁇ m, IGT 12 - 15 cm, Cobb Unger for dense side 0.9 - 1.6 g/m 2 and for open side 1.2 - 2.5 g/m 2 .
- An object of the invention is to create a production line which is simple, cost effective and raw material saving production line and a method of producing fiber webs with high production capacity.
- the fiber web after drying with dry gas blows the fiber web is further dried by traditional drying methods, for example by drying cylinders. This is advantageous as the fiber web is again cool and thus the temperature difference and the heat flow have increased.
- cycle of drying with dry gas blows and drying with traditional drying methods is repeated at least once.
- the fiber web is dried by cool, dry gas after the drying section before a calender.
- the fiber web is cooled by the long run or by the long run provided with cool, dry gas blows is located before a pre-calender.
- the fiber web that comprises starch is cooled before calendering by the long run or by the long run provided with cool, dry gas blows and the fiber web is calendered in a calendering nip comprising a thermo roll, temperature of which is at the most 150 °C, advantageously at the most 100 °C.
- the production line further comprises a Yankee cylinder and/or belt arrangement, a size press and an after drying section located after the Yankee cylinder and/or belt arrangement and/or the size press and/or the calender.
- the production speed of the production line is advantageously 100 - 2000 m/min.
- the head box is a two or a three layer head box.
- the drying section comprises at least one drying cylinder group with one wire draw and/or at least one drying cylinder group with twin wire draw.
- the size press is a bond sizer or a spray sizer or a film sizer.
- the production line comprises at least one cooler 144 providing gas blows after the press section, at least one moisturizing device located before at least one cooler 144, at least one calender 15, a reel-up 19, a slitter-winder 20 and/or a sheet cutter.
- the cooler 144 comprises means to blow dry, cool gas towards at least one surface of the fiber web W.
- calenders 15 can be used as a pre-calender and/or as an intermediate and/or as an final-calender, for example hard nip calenders, soft nip calenders, supercalenders, metal belt calenders, shoe calenders, long nip calenders, multinip calenders.
- a non-contacting means for cooling the fiber web i.e. the cooler 144 providing cool gas is located and length of the fiber web run between last contact point of the fiber web on the last drying or cooling cylinder before the calender 15 and the first contact point of the fiber web on the first calender roll forming calendering nip of the calender 15 it is 7 - 20 m, advantageously 10 - 15 m.
Abstract
Description
- In general present invention relates to producing fiber webs in a fiber web production line, in particular to producing board webs. More especially the present invention relates to a method according to preamble part of claim 1 and to a production line according to preamble part of
claim 8. - As known from the prior art in fiber web producing processes typically comprise an assembly formed by a number of apparatuses arranged consecutively in the process line. A typical production and treatment line comprises a head box, a wire section and a press section as well as a subsequent drying section and a reel-up. The production and treatment line can further comprise other devices and/or sections for finishing the fiber web, for example, a pre-calender, a sizer, a final-calender, a coating section. The production and treatment line also typically comprises at least one slitter-winder for forming customer rolls as well as a roll packaging apparatus or a sheet cutter. In this description and the following claims by fiber webs are meant for example a paper and board webs.
- In traditional drying methods of fiber webs thermal energy is provided to the fiber webs by contact, for example by drying cylinders; by convection, for example by impingement dryers; by condensation of steam on the surfaces of the fiber webs, for example by steam boxes; by radiation, for example by infrared dryers. During drying temperature of the fiber web increases and thus partial pressure of steam in the fiber web increases. Difference of partial steam pressures in the fiber web and the ambient air seeks to even out, whereby the fiber web evaporates moisture and dries. Especially towards the end of the drying process, when the fiber web is relatively dry and hot, efficiency of the traditional drying (in particularly when using drying cylinders) decreases, due to small temperature difference and small heat flow.
- Calendering can be pre-calendering or intermediate calendering or final calendering depending on the type of the production line. Pre-calendering is typically used for creating required surface properties for further treatment for example for coating and final-calendering is generally carried out in order to improve the properties, like smoothness and gloss, of a web-like material such as a paper or board web. In calendering the web is passed into a nip, i.e. calendering nip, formed between rolls that are pressed against each other, in which nip the web becomes deformed as by the action of temperature, moisture and nip pressure. In the calender the nips are formed between a smooth-surfaced press roll such as a metal roll and a roll coated with resilient material such as a polymer roll or between two smooth-surfaced rolls. The resilient-surfaced roll adjusts itself to the forms of the web surface and presses the opposite side of the web evenly against the smooth-surfaced press roll. The nips can be formed also by using instead one of roll a belt or a shoe as known from prior art. Many different kinds of calenders to be used as a pre-calender and/or an intermediate calender and/or as an final-calender are known, for example hard nip calenders, soft nip calenders, supercalenders, metal belt calenders, shoe calenders, long nip calenders, multinip calenders etc.
- Paper and board are available in a wide variety of types and can be divided according to basis weight in two grades: papers with a single ply and a basis weight of 25 - 300 g/m2 and boards manufactured in multi-ply technology and having a basis weight of 150 - 600 g/m2. It should be noted that the borderline between paper and board is flexible since board grades with lightest basis weights are lighter than the heaviest paper grades. Generally speaking, paper is used for printing and board for packaging.
- The subsequent descriptions are examples of values presently applied for fibrous webs, and there may be considerable fluctuations from the disclosed values. The descriptions are mainly based on the source publication Papermaking Science and Technology, section Papermaking Part 3, edited by Rautiainen, P., and published by Paper Engineers' Association, Helsinki 2009; 404 pages.
- Mechanical-pulp based, i.e. wood-containing printing papers include newsprint, uncoated magazine and coated magazine paper.
- Today's newsprint furnishes mostly contain between 80 and 100 % deinked pulp (DIP). The rest of the furnish is mechanical pulp (typically TMP). However, there is also newsprint made of 100 % mechanical fiber furnishes. DIP based newsprint may contain up to 20 % filler. The filler content of a virgin-fiber based newsprint furnish is about 8 %.
- General values for CSWO newsprint can be regarded as follows: basis weight 40 - 48.8 g/m2, PPS s10 roughness (SCAN-P 76-95) 4.0 - 4.5 µm, Bendtsen roughness (SCAN-P21:67) 150 ml/min, density 600 - 750 kg/m3, brightness (ISO 2470:1999) 58 - 59 %, and opacity (ISO 2470:1998) 92 - 95 %.
- Uncoated magazine paper (SC-supercalendered) grades usually contain 50 - 75 % mechanical pulp, 5 - 25 % chemical pulp, and 10 - 35 % filler. The paper may also contain DIP. Typical values for calendered SC paper (containing e.g. SC-C, SC-B, and SC-A/A+) include basis weight 40 - 60 g/m2, ash content (SCAN-P 5:63) 0 - 35 %, Hunter gloss (ISO/DIS 8254/1) < 20 - 50%, PPS s10 roughness (SCAN-P 76:95) 1.0 - 2.5 µm, density 700 - 1250 kg/m3, brightness (ISO 2470:1999) 62 - 75 %, and opacity (ISO 2470:1998) 90 - 95 %.
- Coated mechanical papers include for example MFC (machine finished coated), LWC (light weight coated), MWC (medium weight coated), and HWC (heavy weight coated) grades. Coated mechanical papers usually contain 45 - 75 % mechanical or recycled fiber and 25 - 55 % chemical pulp. Semichemical pulps are typical in LWC paper grades made in the Far East. The filler content is about 5 -10 %. The grammage is typically in the range 40 - 80 g/m2.
- General values for LWC paper can be regarded as follows: basis weight 40 - 70 g/m2, Hunter gloss 50 - 65 %, PPS S10 roughness 1.0 - 1.5 µm (offset) and 0.6 - 1.0 µm (roto), density 1100 - 1250 kg/m3, brightness 70 - 75 %, and opacity 89 - 94 %.
- General values for MFC paper (machine finished coated) can be regarded as follows: basis weight 48 - 70 g/m2, Hunter gloss 25 - 40 %, PPS S10 roughness 2.2 - 2.8 µm, density 900 - 950 kg/m3, brightness 70 - 75 %, and opacity 91 - 95 %.
- General values for MWC paper (medium weight coated) can be regarded as follows: basis weight 70 - 90 g/m2, Hunter gloss 65 - 70 %, PPS S10 roughness 0.6 - 1.0 µm, density 1150 - 1250 kg/m3, brightness 70 - 75 %, and opacity 89 - 94 %.
- Woodfree paper is divided into two segments: uncoated and coated. Conventionally, the furnish of woodfree papers consists of bleached chemical pulp, with less than 10 % mechanical pulp.
- Typical values are for uncoated WFU Copy paper: grammage 70 - 80 g/m2, Bendtsen roughness 150 - 250 ml/min and bulk > 1.3 cm3/g; for uncoated offset paper: grammage 60 - 240 g/m2, Bendtsen roughness 100 - 200 ml/min and bulk 1.2 - 1.3 cm3/g; and for color copy paper: grammage 100 g/m2, Bendtsen roughness < 50 ml/min and bulk 1.1 cm3/g.
- In coated pulp-based printing papers (WFC), the amounts of coating vary widely in accordance with requirements and intended application. The following are typical values for once- and twice-coated, pulp-based printing paper: once-coated basis weight 90 g/m2, Hunter gloss 65 - 80 %, PPS s10 roughness 0.75 - 1.1 µm, brightness 80 - 88 %, and opacity 91 - 94 %, and twice-coated basis weight 130 g/m2, Hunter gloss 70 - 80 %, PPS S10 roughness 0.65 - 0.95 µm, brightness 83 - 90 %, and opacity 95 - 97 %.
- Containerboard includes both linerboard and corrugating medium. Liners are divided according to their furnish base into kraftliner, recycled liner and white top liner. Liners are typically 1- to 3-ply boards with grammages varying in the range 100 - 300 g/m2.
- Linerboards are generally uncoated, but the production of coated white-top liner is increasing to meet higher demands for printability.
- The main cartonboard grades are folding boxboard (FBB), white-lined chipboard (WLC), solid bleached board (SBS) and liquid packaging board (LPB). In general, these grades are typically used for different kinds of packaging of consumer goods. Carton board grades vary from one- up to five-ply boards (150-400 g/m2). The top side is usually coated with from one to three layers (20-40 g/m2), the back side has less coating or no coating at all. There is a wide range of different quality data for the same board grade. FBB has the highest bulk thanks to the mechanical or chemimechanical pulp used in the middle layer of the base board. The middle layer of WLC consists mainly of recycled fiber, whereas SBS is made from chemical pulp, exclusively.
- FBB's bulk typically is between 1.1 - 1.9 cm3/g whereas WLC is on range 1.1 - 1.6 cm3/g and SBS 0.95 - 1.3 cm3/g. The PPS-s10-smoothess is respectively for FBB between 0.8 - 2.1 µm, for WLC 1.3 - 4.5 µm and for SBS 0.7 - 2.1 µm.
- Release paper is used in label base paper in various end-use applications, such as food packaging and office labels. The most common release paper in Europe is supercalendered glassine paper coated with silicone to provide good release properties.
- Typical values for supercalendered release papers are basis weight 60 - 95 g/m2, caliper 55 - 79 µm, IGT 12 - 15 cm, Cobb Unger for dense side 0.9 - 1.6 g/m2 and for open side 1.2 - 2.5 g/m2.
- Coated label paper is used as face paper for release, but also for coated backing paper and flexible packings. Coated label paper has a grammage of 60 - 120 g/m2 and is typically sized or precoated with a sizer and single-blade coated on one side. Some typical paper properties for coated and calendered label paper are basis weight 50 - 100 g/m2, Hunter gloss 70 - 85 %, PPS s10 roughness 0.6 - 1.0 µm, Bekk smoothness 1500 - 2000 s and caliper 45 - 90 µm.
- One problem with calendering of fiber webs is to achieve required surface properties and simultaneously achieve required bulkiness i.e. relation of thickness of the web to its grammage (basis weight). When the fiber web has high bulkiness the basis weight can be reduced which results as considerable savings in raw material. Thus in recent times it has been one of the main focus points in developing calenders, mostly due to environmental and cost saving reasons.
- Typically the fiber web is guided from the drying section to a precalender, when the temperature of the fiber web is about 80 - 90 °C. In the thickness direction of the web the middle layers of the web are hot and near plastic state, whereby during calendering the fiber web will compact also in the middle layers, which leads to bulk loss.
- It is known from prior art that bulkiness can be saved in calendering by cooling the fiber web before calendaring.
- An object of the invention is to create a production line which is simple, cost effective and raw material saving production line and a method of producing fiber webs with high production capacity.
- A further object of the present invention is to approach the above problems from a new point of view and to suggest novel solutions contrary to conventional modes of thinking.
- One further object of the present invention is to provide an energy efficient drying to the production line of a fiber web and to the method of producing a fiber web.
- To achieve the objects mentioned above and later the method according to the invention is mainly characterized by the features of the characterizing part of claim 1.
- The production line according to the invention is mainly characterized by the features of the characterizing part of
claim 8. - Advantageous embodiments and features of the method and of the production line are defined in dependent claims.
- According to the invention advantageously in drying of a fiber web thermal energy of the fiber web is utilized such that difference of partial steam pressures of the fiber web and the ambient air is created by providing dry gas, for example air or air-mixture or gas-mixture, blows on at least one surface of the fiber web. The thermal energy of the fiber web will thus be utilized for evaporation as dry gas is blown onto at least surface of the fiber web, whereby moisture of the fiber web evaporates, where by latent thermal energy is combined with the evaporation and thus the fiber web cools according to equation:
- According to an advantageous feature of the invention after drying with dry gas blows the fiber web is further dried by traditional drying methods, for example by drying cylinders. This is advantageous as the fiber web is again cool and thus the temperature difference and the heat flow have increased.
- According to an advantageous feature of the invention relative humidity of the dry gas blows is at the most 70 %.
- According to an advantageous feature of the invention cycle of drying with dry gas blows and drying with traditional drying methods is repeated at least once. According to an advantageous feature of the invention the fiber web is dried by cool, dry gas after the drying section before a calender. By this waste heat of the fiber web will be utilized and thus energy savings are achieved and additionally the calendering is improved, especially the bulkiness / roughness relation is improved 2 - 6 % as the fiber web entering the calender is cool and as the cooler fiber web endures more pressure.
- According to an advantageous feature of the invention temperature of the cool, dry gas blows is lower than temperature of the fiber web.
- According to an advantageous feature of the invention the fiber web is dried with cool, dry gas at least before calendering and/or at least before reeling.
- According to an advantageous feature of the invention a 7 - 20 m, advantageously 10 - 15 meters long run of the fiber web without processing or treating the fiber web or provided with drying with cool, dry gas is before the calendering and/ or reeling. The distance is calculated from the point where the fiber web leaves the last means processing or treating the fiber web i.e. the previous drying or cooling cylinder before the calender, to the point where the fiber web contacts the first roll of the calender or contacts the reeling cylinder. Temperature of the dry, cool gas blows is advantageously 10 - 60 °C. Thus drying without using extra energy supply is achieved. During this run the free surfaces of the fiber web are cooled, whereby the partial pressure of steam on the surfaces decreases and in middle of the fiber web the partial pressure of steam remains high. Thereby the difference in partial steam pressures conveys the moisture by diffusion from middle of the fiber web to the surfaces of the fiber web and drying is enhanced.
- According to an advantageous feature of the invention the fiber web is cooled by the long run or by the long run provided with cool, dry gas blows is located before a pre-calender. By this calendering is improved and as thermal effect of a roll calender nip is low the fiber web is still cool when entering a coating station and thus also the coating is improved as coating cools fast, whereby viscosity of water of the coating increases fast and the coating remains on the surface of the fiber web.
- According to an advantageous feature of the invention the fiber web that comprises starch is cooled before calendering by the long run or by the long run provided with cool, dry gas blows and the fiber web is calendered in a calendering nip comprising a thermo roll, temperature of which is at the most 150 °C, advantageously at the most 100 °C. By this adherence of the starch onto the surface of the thermo roll is prevented.
- The production line according to the invention advantageously comprises at least one head box, which can be a two or three layer head box, forming means for each layer or layer combination, a press section with at least one press nip, a drying section, at least one calender.
- According to an advantageous embodiment of the invention the production line further comprises a Yankee cylinder and/or belt arrangement, a size press and an after drying section located after the Yankee cylinder and/or belt arrangement and/or the size press and/or the calender.
- According to an advantageous embodiment of the invention the production line further comprises a coating section for coating the fiber web by 1 - 6 layers of coating and drying means for drying the coating.
- The production speed of the production line is advantageously 100 - 2000 m/min.
- The basis weight of the fiber web produced by the production line is 50 - 1000 g/m2.
- The end product of the production line is a fiber web with 1 - 10 fiber layers.
- The end product of the production line is a fiber web with 1 - 10 coating layers.
- According to an advantageous feature of the invention the head box is a two or a three layer head box.
- According to an advantageous feature of the invention the press section comprises at least one roll press nip and/or at least one shoe press nip.
- According to an advantageous feature of the invention the drying section comprises at least one drying cylinder group with one wire draw and/or at least one drying cylinder group with twin wire draw.
- According to an advantageous feature of the invention the calender is a pre- or an intermediate or an end calender.
- According to an advantageous feature of the invention the size press is a bond sizer or a spray sizer or a film sizer.
- According to an advantageous feature of the invention the after coating section comprises at least one of the following: a bond coater, an air brush coater, a sizer, a blade coater, a rod coater, a curtain coater, a spray coater, a cast coater.
- In the following the invention is further explained in detail with reference to the accompanying drawing in which:
- In
figures 1 - 4 is schematically shown an advantageous example of a production line according to the invention. - In the following disclosure and the accompanying drawings corresponding parts, part components, sections etc. are marked by same reference signs unless otherwise mentioned.
- In the schematical example of a production line for producing coated fiber webs, in particular coated board webs shown in
figures 1 - 4 the production line for producing fiber webs comprises threehead boxes unit section 10 of the production line, in which forming section the fiber web W is formed and moisture is removed from the fiber web. In apress section 11 the fiber web W is pressed in press nips 111, 112. A dryingsection 12 of the production line comprises traditional drying in drying cylinder group/-s 121 of one-wire draw and/or in drying cylinder group/-s section 12 is followed by asize press 131 of asizing section 13, which comprises adrying section 14 for the size, which drying section comprises aturning device 141, non-contact drying means 142, dryingcylinder group 143 with twin-wire draw. After thedrying section 14 for the size is provided a cooler 144. After the cooler 144 the fiber web is calendered in a calendering nip formed between two calender rolls in acalender 15 followed by drying by non-contact drying means 152. There after the fiber web W is coated incoating section coaters coater drying cylinder group end calender 18 is located, in which the fiber web W is calendered in two calendering nips 181, 182 formed between calender rolls. At the end of the production line the fiber web W is reeled to aparent roll 192 having full width fiber web in a reel-up 19 by a reelingcylinder 191. The parent rolls 192 are transferred to anunwinder 201 of the slitter-winder 20. The unwound full width fiber web W is cut in longitudinal direction of the fiber web W i.e. slitted in aslitter 202 to partial fiber webs WN by slitter blades and the partial fiber webs WN are wound to partial fiber web rolls i.e. customer rolls in awinder 203. - These devices and sections can be constructed in various different designs and constructions known as such to one skilled in the art. Advantageously the head box is a two or a three
layer head box drying cylinder group 121 with one wire draw and/or at least onedrying cylinder group size press 131 is a bond sizer or a spray sizer or a film sizer. - The production line comprises at least one cooler 144 providing gas blows after the press section, at least one moisturizing device located before at least one
cooler 144, at least onecalender 15, a reel-up 19, a slitter-winder 20 and/or a sheet cutter. The cooler 144 comprises means to blow dry, cool gas towards at least one surface of the fiber web W. Many different kinds ofcalenders 15 can be used as a pre-calender and/or as an intermediate and/or as an final-calender, for example hard nip calenders, soft nip calenders, supercalenders, metal belt calenders, shoe calenders, long nip calenders, multinip calenders. - The production line can further comprise a Yankee cylinder and/or belt arrangement, a
size press 131 and an after dryingsection calender 15 and acoating section coating section coater - Between the
calender 15 of the production line and the last drying or cooling cylinder before it a non-contacting means for cooling the fiber web i.e. the cooler 144 providing cool gas is located and length of the fiber web run between last contact point of the fiber web on the last drying or cooling cylinder before thecalender 15 and the first contact point of the fiber web on the first calender roll forming calendering nip of thecalender 15 it is 7 - 20 m, advantageously 10 - 15 m. - Above only some advantageous examples of the inventions has been described to which examples the invention is not to be narrowly limited and many modifications and alterations are possible within the invention.
Claims (12)
- Method for producing a fiber web (W), in which method furnish is fed from at least one head box (7, 8, 9) to at least one forming section (10) for forming the furnish to the fiber web, the fiber web is pressed in a press section (11), the fiber web is dried in at least one drying section (12), the fiber web is calendered in at least one calender (15, 18) and reeled in a reel-up (19), characterized in, that in drying of a fiber web (W) thermal energy of the fiber web (W) is utilized such that difference of partial steam pressures of the fiber web (W) and the ambient air is created by providing dry gas blows on at least one surface of the fiber web whereby thermal energy of the fiber web is utilized for evaporation of moisture from the fiber web.
- Method according to claim 1, characterized in, that the fiber web is run without processing or treating the fiber web 7 - 20 m, advantageously 10 - 15 meters before the calendering and/or the reeling.
- Method according to claim 1 or 2, characterized in, that during the run before the calendering and/or the reeling the fiber web (W) is dried with cool, dry gas blows.
- Method according to claim 3, characterized in, that after drying with the cool, dry gas blows the fiber web (W) is further dried by traditional drying methods, for example by drying cylinders.
- Method according to any of claims 1 - 4, characterized in, that relative humidity of the dry gas blows is at the most 70 %.
- Method according to any of claims 1 - 5, characterized in, that temperature of the cool, dry gas blows is lower than temperature of the fiber web (W).
- Method according to claim 4, characterized in, that the drying with dry gas blows and the drying with traditional drying methods is repeated at least once.
- Method according to any of previous claims, characterized in, that the fiber web (W) that comprises starch is cooled before the calendering by the long run or by the long run provided with cool, dry gas blows and the fiber web is calendered in a calendering nip comprising a thermo roll, temperature of which is at the most 150 °C, advantageously at the most 100 °C.
- Production line for producing fiber webs comprising at least one head box (7, 8, 9), which can be a two or three layer head box, forming means (10) for each layer or layer combination of the fiber web (W), a press section (11) with at least one press nip, at least one drying section (12), at least one calender (15, 18), a reel-up (19), characterized in, that that length of the fiber web run between the at least one calender (15) and the previous drying or cooling cylinder, before it is 7 - 20 m, advantageously 10 - 15 m.
- Production line according to claim 9, characterized in, that the production line further comprises a Yankee cylinder and/or belt arrangement, a size press (14) and an after drying section located after the Yankee cylinder and/or belt arrangement and/or the size press (14) and/or the calender (15).
- Production line according to claim 9 or 10, characterized in, that the production line further comprises a coating section (16, 17) for coating the fiber web by 1 - 6 layers of coating and drying means (162, 163, 172, 173) for drying the coating.
- Production line according to any of claims 9-11, characterized in, that production speed of the production line is 100 - 2000 m/min and/or basis weight of the fiber web (W) produced by the production line is 50 - 1000 g/m2 and/or end product of the production line is a fiber web (W) with 1 - 10 fiber layers and/or end product of the production line is a fiber web (W) with 1 - 6 coating layers.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16164657.5A EP3231936B1 (en) | 2016-04-11 | 2016-04-11 | Method for producing fiber webs |
CN201710231865.2A CN107287966A (en) | 2016-04-11 | 2017-04-11 | Produce the method for fiber web and the production line of production fiber web |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP16164657.5A EP3231936B1 (en) | 2016-04-11 | 2016-04-11 | Method for producing fiber webs |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3231936A1 true EP3231936A1 (en) | 2017-10-18 |
EP3231936B1 EP3231936B1 (en) | 2023-10-11 |
Family
ID=55802198
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16164657.5A Active EP3231936B1 (en) | 2016-04-11 | 2016-04-11 | Method for producing fiber webs |
Country Status (2)
Country | Link |
---|---|
EP (1) | EP3231936B1 (en) |
CN (1) | CN107287966A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4230793A1 (en) * | 2022-02-17 | 2023-08-23 | Valmet Technologies Oy | Method and system of producing of fiber webs |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP3540119B1 (en) * | 2018-03-15 | 2023-08-02 | Valmet Technologies Oy | Fiber web machine and method of forming a multi-ply web |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000070144A1 (en) * | 1999-05-12 | 2000-11-23 | Metso Paper, Inc. | Method for the manufacture of paper, and paper machine line |
WO2005042837A1 (en) * | 2003-11-03 | 2005-05-12 | Metso Paper, Inc | A precalendering method and a treatment line for paper |
EP2682520A1 (en) * | 2012-07-03 | 2014-01-08 | Metso Paper Inc. | Method for producing fiber webs and production line for producing fiber webs |
EP2876206A1 (en) * | 2013-11-21 | 2015-05-27 | Valmet Technologies, Inc. | Method for producing fiber webs and production line for producing fiber webs |
-
2016
- 2016-04-11 EP EP16164657.5A patent/EP3231936B1/en active Active
-
2017
- 2017-04-11 CN CN201710231865.2A patent/CN107287966A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2000070144A1 (en) * | 1999-05-12 | 2000-11-23 | Metso Paper, Inc. | Method for the manufacture of paper, and paper machine line |
WO2005042837A1 (en) * | 2003-11-03 | 2005-05-12 | Metso Paper, Inc | A precalendering method and a treatment line for paper |
EP2682520A1 (en) * | 2012-07-03 | 2014-01-08 | Metso Paper Inc. | Method for producing fiber webs and production line for producing fiber webs |
EP2876206A1 (en) * | 2013-11-21 | 2015-05-27 | Valmet Technologies, Inc. | Method for producing fiber webs and production line for producing fiber webs |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4230793A1 (en) * | 2022-02-17 | 2023-08-23 | Valmet Technologies Oy | Method and system of producing of fiber webs |
Also Published As
Publication number | Publication date |
---|---|
CN107287966A (en) | 2017-10-24 |
EP3231936B1 (en) | 2023-10-11 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
US9322135B2 (en) | Method for producing fiber webs and production line for producing fiber webs | |
EP2682520B1 (en) | Method for producing fiber webs and production line for producing fiber webs | |
EP3875684B1 (en) | Method of treating a fiber web and a treatment system for treatment of a fiber web | |
US10094067B2 (en) | Production line for producing fiber webs and a cooler | |
EP3012371A1 (en) | Method of treating a fiber web and a calender for treating a fiber web | |
EP3231936B1 (en) | Method for producing fiber webs | |
EP3988713B1 (en) | Method of treating a fiber web and a treatment system for treatment of a fiber web | |
JP4651678B2 (en) | Surface size paper / paperboard generation method | |
US9133580B2 (en) | Method for modernizing a multiroll calender, in particular for modernizing a supercalender and a modernized multiroll calender, in particular a modernized supercalender | |
WO2007128867A1 (en) | Method and apparatus for the surface treatment of paper/board | |
FI128040B (en) | Method of treating a fiber web and a treatment system for treatment of a fiber web | |
EP2876205A1 (en) | Method for calendering a fiber web and calender | |
EP2808444B1 (en) | Calender arrangement | |
JP2008506043A (en) | Method for treating fiber web in downstream of slitter | |
FI20185739A1 (en) | Method of treating a fiber web and a treatment system for treatment of a fiber web | |
FI20185723A1 (en) | Method of treating a fiber web and a treatment system for treatment of a fiber web | |
EP2617895B1 (en) | Method in a multiroll calender |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE APPLICATION HAS BEEN PUBLISHED |
|
AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
AX | Request for extension of the european patent |
Extension state: BA ME |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: REQUEST FOR EXAMINATION WAS MADE |
|
17P | Request for examination filed |
Effective date: 20180328 |
|
RBV | Designated contracting states (corrected) |
Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
17Q | First examination report despatched |
Effective date: 20210507 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: EXAMINATION IS IN PROGRESS |
|
GRAP | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOSNIGR1 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: GRANT OF PATENT IS INTENDED |
|
INTG | Intention to grant announced |
Effective date: 20230531 |
|
GRAS | Grant fee paid |
Free format text: ORIGINAL CODE: EPIDOSNIGR3 |
|
GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: THE PATENT HAS BEEN GRANTED |
|
AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR |
|
REG | Reference to a national code |
Ref country code: GB Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
REG | Reference to a national code |
Ref country code: DE Ref legal event code: R096 Ref document number: 602016083336 Country of ref document: DE |
|
REG | Reference to a national code |
Ref country code: IE Ref legal event code: FG4D |
|
REG | Reference to a national code |
Ref country code: LT Ref legal event code: MG9D |
|
REG | Reference to a national code |
Ref country code: NL Ref legal event code: MP Effective date: 20231011 |
|
REG | Reference to a national code |
Ref country code: AT Ref legal event code: MK05 Ref document number: 1620324 Country of ref document: AT Kind code of ref document: T Effective date: 20231011 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: NL Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231011 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GR Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20240112 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: IS Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20240211 |
|
PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: LT Free format text: LAPSE BECAUSE OF FAILURE TO SUBMIT A TRANSLATION OF THE DESCRIPTION OR TO PAY THE FEE WITHIN THE PRESCRIBED TIME-LIMIT Effective date: 20231011 |