EP3231936B1 - Method for producing fiber webs - Google Patents
Method for producing fiber webs Download PDFInfo
- Publication number
- EP3231936B1 EP3231936B1 EP16164657.5A EP16164657A EP3231936B1 EP 3231936 B1 EP3231936 B1 EP 3231936B1 EP 16164657 A EP16164657 A EP 16164657A EP 3231936 B1 EP3231936 B1 EP 3231936B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- fiber web
- drying
- calendering
- calender
- web
- 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.)
- Active
Links
- 239000000835 fiber Substances 0.000 title claims description 110
- 238000004519 manufacturing process Methods 0.000 title claims description 31
- 238000001035 drying Methods 0.000 claims description 61
- 238000003490 calendering Methods 0.000 claims description 35
- 238000000034 method Methods 0.000 claims description 14
- 238000001704 evaporation Methods 0.000 claims description 4
- 230000008020 evaporation Effects 0.000 claims description 4
- 229920002472 Starch Polymers 0.000 claims description 3
- 239000012080 ambient air Substances 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 45
- 239000011248 coating agent Substances 0.000 description 26
- 238000000576 coating method Methods 0.000 description 26
- 239000007789 gas Substances 0.000 description 17
- 239000010410 layer Substances 0.000 description 14
- 229920001131 Pulp (paper) Polymers 0.000 description 12
- 238000001816 cooling Methods 0.000 description 8
- 238000004806 packaging method and process Methods 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 5
- 239000003570 air Substances 0.000 description 4
- 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
- 239000002184 metal Substances 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 240000000486 Lepidium draba Species 0.000 description 2
- 235000000391 Lepidium draba Nutrition 0.000 description 2
- 239000007795 chemical reaction product Substances 0.000 description 2
- 239000011247 coating layer Substances 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
- 230000003020 moisturizing effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000013459 approach Methods 0.000 description 1
- 238000007664 blowing 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
- 239000003595 mist Substances 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.
- 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.
- 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.
- 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.
- 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.
- 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/m 2 and boards manufactured in multi-ply technology and having a basis weight of 150 - 600 g/m 2 . 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.
- 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 %.
- 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/m 2 , 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 ⁇ m, density 700 - 1250 kg/m 3 , 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/m 2 .
- LWC paper can be regarded as follows: basis weight 40 - 70 g/m 2 , Hunter gloss 50 - 65 %, PPS S10 roughness 1.0 - 1.5 ⁇ m (offset) and 0.6 - 1.0 ⁇ m (roto), density 1100 - 1250 kg/m 3 , brightness 70 - 75 %, and opacity 89 - 94 %.
- 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 %.
- 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/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.
- WFC coated pulp-based printing papers
- the amounts of coating vary widely in accordance with requirements and intended application.
- 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/m 2 .
- 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/m 2 ). The top side is usually coated with from one to three layers (20-40 g/m 2 ), 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 cm 3 /g whereas WLC is on range 1.1 - 1.6 cm 3 /g and SBS 0.95 - 1.3 cm 3 /g.
- the PPS-s10-smoothess is respectively for FBB between 0.8 - 2.1 ⁇ m, for WLC 1.3 - 4.5 ⁇ m and for SBS 0.7 - 2.1 ⁇ m.
- 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/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 .
- 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/m 2 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/m 2 , Hunter gloss 70 - 85 %, PPS s10 roughness 0.6 - 1.0 ⁇ m, Bekk smoothness 1500 - 2000 s and caliper 45 - 90 ⁇ m.
- the fiber web is guided from the drying section to a precalender, when the temperature of the fiber web is about 80 - 90 °C.
- 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.
- Publication EP 2682520 A1 discloses a production line for producing fiber webs, which comprises at least one calender with at least one calendering nip and a reel-up after the calender and at least one cooling means before the at least one calender for cooling the fiber web to temperatures of not higher than 40 °C, preferably to temperature in the range of 10 - 30 °C
- Publication WO 2005/042837 A1 discloses a treatment line for paper in which on the travel path of a paper web that is arranged to convey forward the paper web moving at web speed, there is a moistening device, a calender for precalendering the surface of the paper web and a coating unit for coating the paper web precalendered in the calender and the travel path of the paper web between the moistening device and the calender is arranged to have such a length with respect to the web speed that the delay time of the web between the moistening device and a hot precalendering nip surface of the calender located on the same side with respect to said moistening device is 0.6 to 6.0 s.
- Publication WO 00/70144 A1 discloses a paper machine line in particular for the manufacture of fine paper, which line comprises a short circulation, a headbox, a wire section, a press section, a dryer section, a precalender, a precoater and a drying section after that, a coating station/stations and after-drying section/sections, a calender and a reel-up, which may comprise a moistening device based on steam or water mist, placed before the calender, for profile control of curl.
- Publication EP2876206 A1 discloses a method, in which fiber web is cooled at least partially by moisturizing and evaporative cooling process, advantageously by combination of applying moisture, for example water, and of blowing dry cool gas, for example air, onto the surface of the fiber web. The moisture evaporates and cools the fiber web.
- 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 defined by the features of claim 1.
- 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 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.
- relative humidity of the dry gas blows is at the most 70 %.
- 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.
- 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.
- temperature of the cool, dry gas blows is lower than temperature of the fiber web.
- the fiber web is dried with cool, dry gas at least before calendering and/or at least before reeling.
- a 7 - 20 m, advantageously 10 - 15 meters long run of the fiber web is before the calendering or reeling, advantageously without processing or treating the fiber web or provided with drying with cool, dry gas.
- a 7 - 20 m, advantageously 10 - 15 meters long run of the fiber web is before the calendering and reeling, advantageously without processing or treating the fiber web or provided with drying with cool, dry gas. 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.
- drying without using extra energy supply is achieved.
- 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.
- 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.
- 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 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.
- 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 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/m 2 .
- 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.
- the head box is a two or a three layer head box.
- the press section comprises at least one roll press nip and/or at least one shoe press nip.
- 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 calender is a pre- or an intermediate or an end calender.
- the size press is a bond sizer or a spray sizer or a film sizer.
- 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.
- the production line for producing fiber webs comprises three head boxes 7, 8, 9 each for providing furnish for one fiber layer of the fiber web W and each followed by a forming unit 101, 102, 103 in a forming section 10 of the production line, in which forming section the fiber web W is formed and moisture is removed from the fiber web.
- a press section 11 the fiber web W is pressed in press nips 111, 112.
- a drying section 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 122, 12N of twin-wire draw.
- the drying section 12 is followed by a size press 131 of a sizing section 13, which comprises a drying section 14 for the size, which drying section comprises a turning device 141, non-contact drying means 142, drying cylinder group 143 with twin-wire draw.
- a cooler 144 After the drying 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 a calender 15 followed by drying by non-contact drying means 152. There after the fiber web W is coated in coating section 16, 17, which provides coating for two coating layers by coaters 161, 171.
- Each coater 161, 171 is followed by a drying section comprising non-contact drying means 162, 172 and/or a drying cylinder group 163, 173.
- an end calender 18 is located, in which the fiber web W is calendered in two calendering nips 181, 182 formed between calender rolls.
- the fiber web W is reeled to a parent roll 192 having full width fiber web in a reel-up 19 by a reeling cylinder 191.
- the parent rolls 192 are transferred to an unwinder 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 a slitter 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 a winder 203.
- the head box is a two or a three layer head box 7, 8, 9, the press section comprises at least one roll press nip 111 and/or at least one shoe press nip 112, the drying section comprises at least one drying cylinder group 121 with one wire draw and/or at least one drying cylinder group 122, 12N with twin wire draw and the 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 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.
- the production line can further comprise a Yankee cylinder and/or belt arrangement, a size press 131 and an after drying section 14, 152 located after the Yankee cylinder and/or belt arrangement and/or the size press and/or the calender 15 and a coating section 16, 17 for coating the fiber web by 1 - 4 layers of coating and drying means for drying the coating.
- the coating section 16, 17 comprises at least one coater 161, 171 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.
- 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.
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- Paper (AREA)
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 (zh) | 2016-04-11 | 2017-04-11 | 生产纤维幅材的方法和生产纤维幅材的生产线 |
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 EP3231936A1 (en) | 2017-10-18 |
EP3231936B1 true 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 (zh) |
CN (1) | CN107287966A (zh) |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI3540119T3 (fi) * | 2018-03-15 | 2023-09-21 | Valmet Technologies Oy | Kuiturainakone ja menetelmä monikerroksisen rainan muodostamiseksi |
FI20225142A1 (en) * | 2022-02-17 | 2023-08-18 | Valmet Technologies Oy | Method and system for making fiber webs |
Family Cites Families (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FI991096A (fi) * | 1999-05-12 | 2000-11-13 | Valmet Corp | Menetelmä paperin, erityisesti hienopaperin, valmistamiseksi ja paperi konelinja erityisesti hienopaperin valmistamista varten |
FI116980B (fi) * | 2003-11-03 | 2006-04-28 | Metso Paper Inc | Esikalanterointimenetelmä ja paperin käsittelylinja |
EP2682520B1 (en) * | 2012-07-03 | 2016-06-22 | Valmet Technologies, Inc. | Method for producing fiber webs and production line for producing fiber webs |
EP2876206B2 (en) * | 2013-11-21 | 2023-03-01 | 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/zh active Pending
Also Published As
Publication number | Publication date |
---|---|
CN107287966A (zh) | 2017-10-24 |
EP3231936A1 (en) | 2017-10-18 |
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