FI91549C - Method for treating a dry formed web of material - Google Patents
Method for treating a dry formed web of material Download PDFInfo
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- FI91549C FI91549C FI920098A FI920098A FI91549C FI 91549 C FI91549 C FI 91549C FI 920098 A FI920098 A FI 920098A FI 920098 A FI920098 A FI 920098A FI 91549 C FI91549 C FI 91549C
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- material web
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Description
9154991549
Menetelma kuivamuodostetun aineradan kåsittelemiseksiA method for treating a dry formed material web
Taman keksinnon kohteena on menetelma kuivamuodostetun kuitumateriaalia sisaltavan aineradan tiivistamiseksi 5 ainerataa sidottaessa sideainekomponentin ja lampokasitte-lyn avulla.The present invention relates to a method for compacting a dry-formed web of material containing fibrous material by bonding 5 webs of material by means of a binder component and a heat treatment.
Nykyisisså ns. thermobonding prosesseissa yhdiste-taån peruskuitumateriaali, esim. puu- tai lasikuitu, eril-listen sideainepartikkelien tai -kuitujen avulla. Sideaine 10 on yleensa kestomuovikuitua, esim. polyeteenia. Tunnetaan myos nk. bikomponenttikuituja, joiden ydinosa voi olla esim. lujempaa polypropeenia ja vaippaosa pehmeampaa polyeteenia, jolla on halutut sitomisominaisuudet peruskuituma-teriaaliin kaytetylla lampotila-alueella. Nain saadaan myos 15 sideainekuidut rasitusta kestaviksi, jolloin niiden muodos-tamat perusmateriaalien kuitujen valiset sillat vahvistu-vat.In the current so-called. in thermobonding processes, the base fiber material, e.g., wood or glass fiber, is compounded with separate binder particles or fibers. The binder 10 is usually a thermoplastic fiber, e.g. polyethylene. So-called bicomponent fibers are also known, the core part of which can be, for example, stronger polypropylene and the sheath part softer polyethylene, which has the desired bonding properties in the temperature range used for the base fiber material. In this way, the binder fibers can also be made to withstand stress, whereby the bridges between the fibers of the base materials formed by them are strengthened.
Thermobonding-prosessin raaka-aineet, yksi tai use-ampi peruskuitulaatu ja sideainekuidut, sekoitetaan ja 20 muodostetaan aineradaksi kuivalla muodostusmenetelmalla, joka on hyvin tunnettu paperin valmistusmenetelma, viita-taan esim. suomalaisiin patentteihin 62386, 58804 ja 66948. Erilaisia ja -pituisia kuituja sisaltavien aineratojen muodostamiseen liittyvia ongelmia on pyritty ratkaisemaan • 25 mm. EP-patentin 188454 ja US-patentin 4375488 mukaisilla muodostusosilla.The raw materials of the thermobonding process, one or more base fiber grades and binder fibers, are mixed and formed into a web by a dry forming method, which is a well-known papermaking method. Reference is made, for example, to Finnish patents 62386, 58804 and 66948. Efforts have been made to solve problems related to the formation of material paths • 25 mm. With forming parts according to EP patent 188454 and US patent 4375488.
Aineradoista saadaankin nykyisilla muodostusteknii-koilla riittavan tasaisia, jotta ne soveltuisivat loppu-tuotteiden valmistukseen. Ongelmaksi on muodostunut ratojen 30 sitomisvaihe, jossa kuidut sidotaan sideainekuiduilla yh-teen lammon ja puristuksen vaikutuksen alaisena. Puristusta tarvitaan tiivistamaan ainerataa siten, etta syntyy kontak-ti eri kuitujen vålilla ja muodostuu tartunta sideainekuitujen ja perusainekuitujen vålilla kestomuovikomponentin 35 sulaessa tai pehmittyesså. Kåytånnosså tåmå tehdåån sellai- 91549 2 sen siirtoyksikon yhteydessa, jossa on låmmitettåviå telo-ja, yleensa jarjestettyinå erikseen rainan yla- ja alapuo-lelle. Ainerata kuljetetaan tarnan jalkeen lapivirtausuunin kautta, jossa lopullinen kuitujen sidonta tapahtuu. On 5 kuitenkin osoittautunut, etta tiivistymista ei tapahdu toivotulla tavalla lopputuotteessa, jolloin sen mekaaniset ominaisuudetkin ovat heikohkot. Tama puolestaan johtuu siitå, etta irrallisista kuiduista muodostettu kuiva ainerata polyaå voimakkaasti siirtoyksikossa, aiheuttaen aine-10 katoa ja epåtåydellistå tiivistymista aineradassa.Indeed, current forming techniques make the material paths sufficiently uniform to be suitable for the production of end products. A problem has become the bonding step of the webs 30, in which the fibers are bonded together with binder fibers under the influence of heat and compression. Compression is required to seal the web so that contact is made between the various fibers and adhesion is formed between the binder fibers and the base fibers as the thermoplastic component 35 melts or softens. In practice, this is done in connection with a transfer unit with heated rollers, usually arranged separately above and below the web. The material web is transported after the tarpaula through a lap flow furnace where the final fiber bonding takes place. However, it has been shown that condensation does not take place in the desired way in the final product, in which case its mechanical properties are also poor. This in turn is due to the fact that the dry material web formed of loose fibers polishes strongly in the transfer unit, causing the loss of material-10 and incomplete condensation in the material web.
Taman keksinnon tarkoituksena on aikaansaada mene-telma, jolla em. ongelmista oleellisesti valtytaan, ja jonka avulla aineradan mekaaniset ominaisuudet parantuvat oleellisesti. TSmån vaikutuksen aikaansaamiseksi keksinnon 15 mukaiselle menetelmalle on tunnusomaista se, etta aineradan polyamisen estamiseksi ainakin sen toinen puoli kostutetaan suihkuttamalla vetta sen pintaan ennen aineradan sitomis-vaihetta.The object of the present invention is to provide a method by which the above-mentioned problems are substantially overcome and by means of which the mechanical properties of the material web are substantially improved. In order to achieve the effect of TS, the method according to the invention is characterized in that, in order to prevent polychaining of the web of material, at least one side thereof is moistened by spraying water on its surface before the step of binding the web of material.
Aivan yllåttaen on kaynyt ilmi, etta aivan pieni 20 veden lisays ainerataan aikaansaa huomattavia parannuksia seka aineradan kåyttåytymisesså sitomisvaiheessa etta sen mekaanisissa ominaisuuksissa. Kuivamuodostusprosesseissa kosteus on aina ollut ei toivottua, ja nytkin sita voidaan lisatå vain hyvin rajoitetusti. Yllåttavinta onkin se pieni : 25 maarå, joka tarvitaan ainakin puu- ja muovikuitujen seoksen polyamisen pienentamiseksi huomattavasti.Quite surprisingly, it has been found that a very small addition of water to the material pathway provides significant improvements in both the behavior of the material pathway during the binding step and its mechanical properties. Moisture has always been undesirable in dry forming processes, and even now it can only be added to a very limited extent. Surprisingly, it is small: the amount of land needed to significantly reduce the polyation of at least the mixture of wood and plastic fibers.
Keksinnon muille edullisille sovellutusmuodoille on tunnusomaista se, mita jaljempana olevissa patenttivaati-muksissa on esitetty.Other preferred embodiments of the invention are characterized by what is set out in the following claims.
30 Keksintoå selostetaan seuraavassa esimerkin avulla viittaamalla oheisiin piirustuksiin, joissa kuvio 1 esittaå yleiskuvaa kuivamuodostuslinjasta ja rainan thermobondinglinjasta, kuvio 2 esittaå keksinnon mukaisen me net elman toteu-35 tusta aineradan siirtoasemassa.The invention will now be described, by way of example, with reference to the accompanying drawings, in which Figure 1 shows an overview of a dry forming line and a web thermobonding line, Figure 2 shows an embodiment of a method Elma according to the invention in a material web transfer station.
IIII
91549 391549 3
Kuviossa 1 on esitetty kuivamuodostuslinja 1, jossa rumpuformereiden 2 avulla muodostetaan ainerata viiralle. Ainerata siirretaan muodostuslinjasta 1 siirtoyksikon 3, jossa euoritetaan aineradan puristus, kautta låpivirtaus-5 uuniin 4, kalanteriasemalle 5, jaahdytysasemalle 6 ja lo-pulta kelausasemalle 7, jossa valmis ainerata kelataan rullalle 8.Figure 1 shows a dry forming line 1 in which drum formers 2 are used to form a web of material on a wire. The material web is transferred from the forming line 1 through a transfer unit 3, where the compression of the material web is carried out, through a flow-5 to a furnace 4, a calender station 5, a cooling station 6 and finally to a winding station 7, where the finished material web is wound on a roll 8.
Kuviossa 2 on esitetty keksinnon mukaisen menetelmån toteutusta kuvion 1 mukaisessa aineradan siirtoasemassa 3. 10 Kuivamuodostettu ainerata tuodaan kuivamuodostusosan vii-ralta 9 siirtoasemalle 3. Kuitumateriaalia, esim 75 % sel-luloosapohjaista ja 25 % termoplastista kuitua, esim. bi-komponenttikuitua sisaltava ainerata 16 lammitetaån ja puristetaan viiralla 9 ensin ylhaalta kompaktoritelan 10 ja 15 sen vastatelan 11 valissa, sen jålkeen alhaalta kuviotelan 12 (embosser) ja sen vastatelan 13 valissa, aineradan ol-lessa siirrettynå siirtoyksikon 3 ylåpuoliselle viiralle 14. Kåytettyjen kuitujen pituus voi selluloosapohjaisten kuitujen osalta olla esim. keskimaårin 1-3 mm ja bikompo-20 nenttikuitujen osalta 2-20 mm.Figure 2 shows the implementation of the method according to the invention in the material web transfer station 3 of Figure 1. The dry formed material web is introduced from the dry forming section line 9 to the transfer station 3. A fibrous material, e.g. 75% cellulose based and 25% thermoplastic fiber, e.g. bi-component fiber and pressed by the wire 9 first from above between the compactor roll 10 and 15 between its counter roll 11, then from below between the embosser 12 and its counter roll 13, the web of material being transferred to the wire 14 above the transfer unit 3. The length of the fibers used may be cellulose-based fibers. on average 1-3 mm and for bicompo-20 nent fibers 2-20 mm.
Taman jålkeen ainerata 16 siirtyy låpivirtausuuniin johtavalle viiralle 15.Thereafter, the material path 16 moves to the wire 15 leading to the flow-through furnace.
Keksinnon mukaisesti aineradan pintaan suihkutetaan vettå suuttime 11a 17 pieninå pisaroina ylhaalta pain juuri ’ 25 ennen kuin ainerataa kuljetetaan kompaktoritelan 10 ja sen vastatelan 11 muodostaman nipin låpi. Vastaavasti ainerataa sumutetaan vedellå altapåin suuttimella 18 ennen aineradan 16 viemistå kuviotelan (embosserin) 12 ja sen vastatelan 13 muodostaman puristusnipin våliin. Edullisesti vastatelat 11 30 ja 13 ovat kumipåållysteisiå. Vesisuihkun tuoma vesimåårå aineradan pinnalle on erittåin pieni, esim. 1-10 g/m2 aineradan kummallekin puolelle. Vesipisaroiden koko ei yleenså ole kovin kriittinen, koska puristusnipisså tapahtuu kos-teuden edelleen levittåmistå tasaisesti koko radan levey-35 delle.According to the invention, water is sprayed onto the surface of the material web in small drops from the nozzle 11a 17 from above just before the material web is conveyed through the nip formed by the compactor roll 10 and its counter roll 11. Correspondingly, the material web is sprayed with water below the nozzle 18 before the material web 16 is introduced between the nip formed by the pattern roll (embosser) 12 and its counter roll 13. Preferably, the counter rollers 11, 30 and 13 are rubber coated. The amount of water brought by the water jet to the surface of the material web is very small, e.g. 1-10 g / m2 on each side of the material web. The size of the water droplets is generally not very critical, because in the compression nip there is a further distribution of moisture evenly over the entire width of the track.
91549 491549 4
Kompaktori- ja kuviotelat tela on kuumennettu aine-radan lammittamiseksi sitomislåmpotilaan, esim. 120 °C:een. Låmpdtilaa voidaan saatåå aineradan nopeuden (kapae i teet in) ja sen paksuuden seka kaytetyn sideainekomponentin ominai-5 suuksien mukaan sopivaksi esim. alueella 100-160 °C.The compactor and pattern rollers are heated to heat the material web to a bonding temperature, e.g., 120 ° C. The temperature can be made suitable, e.g. in the range of 100-160 ° C, according to the speed of the material web (capacity) and its thickness, as well as the properties of the binder component used.
Kaytanndn kokeet on tehty sellupohjaisilla kuiduil-la, joiden muodostama aineradan pintapaino on vaihdellut vålillå 50 ... 220 g/m2, mutta menetelma soveltuu ainakin 600 grammaan asti nelidmetria kohti painavien aineratojen 10 kasittelyyn. Kokeis s a on todettu, etta veden sumutus v&hen-tåa rainan polyamista 40 % n. 2 g/m2 veden lisayksella, jonka jalkeen oleellista paranemista ei vetta lisaanuillå enaå tapahdu. Vastaavasti aineradan vetolu juus mitattuna 50 mm liuskan kuormankantokykyna paranee n. 1900 grammasta 15 taysin kuivana muodostetun aineradan kohdalla n. 2500 grammaan 2 g/m2 veden lisåyksella aina yli 2900 grammaan 8 g/m2 veden lisayksellå, eli valmiin aineradan vetolujuus paranee sekin våhintåan 40 % ja enemman. Lisaksi keksinnon mukai-sella kostutuksella paåståån suurelta os in polyn koneistol-20 le ja hengitysilmalle aiheutetuista haitoista.The experiments have been performed on pulp-based fibers, the surface weight of which has varied between 50 and 220 g / m2, but the method is suitable for handling material webs weighing at least 600 grams per square meter. Experimentally, it has been found that the spraying of water reduces the polyamide of the web by 40% with the addition of about 2 g / m 2 of water, after which there is no further substantial improvement with the addition of water. Correspondingly, the tensile strength of the web, measured as a 50 mm strip load capacity, is improved from about 1,900 grams for a completely dry web to about 2,500 grams by adding 2 g / m 2 of water to more than 2,900 grams with 8 g / m 2 of water. and more. In addition, the wetting according to the invention eliminates a large part of the disadvantages caused to the Polyn machinery and the breathing air.
Alan ammattimiehelle on selvaå, etta keksinnon eri sovellutusmuodot eivåt rajoitu ylla esitettyihin es inter k-keihin, vaan etta ne voivat vaihdella jaljempånå olevien patenttivaatimusten puitteissa.It will be apparent to those skilled in the art that the various embodiments of the invention are not limited to the es inter ks set forth above, but may vary within the scope of the following claims.
lili
Claims (8)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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FI920098A FI91549C (en) | 1992-01-09 | 1992-01-09 | Method for treating a dry formed web of material |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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FI920098A FI91549C (en) | 1992-01-09 | 1992-01-09 | Method for treating a dry formed web of material |
FI920098 | 1992-01-09 |
Publications (4)
Publication Number | Publication Date |
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FI920098A0 FI920098A0 (en) | 1992-01-09 |
FI920098A FI920098A (en) | 1993-07-10 |
FI91549B FI91549B (en) | 1994-03-31 |
FI91549C true FI91549C (en) | 1994-07-11 |
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FI920098A FI91549C (en) | 1992-01-09 | 1992-01-09 | Method for treating a dry formed web of material |
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Publication number | Publication date |
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FI91549B (en) | 1994-03-31 |
FI920098A (en) | 1993-07-10 |
FI920098A0 (en) | 1992-01-09 |
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