NO150125B - PROCEDURE FOR THE PREPARATION OF PAPER CLIMBER MAINLY CONSISTING OF STARCH. - Google Patents
PROCEDURE FOR THE PREPARATION OF PAPER CLIMBER MAINLY CONSISTING OF STARCH. Download PDFInfo
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- NO150125B NO150125B NO782649A NO782649A NO150125B NO 150125 B NO150125 B NO 150125B NO 782649 A NO782649 A NO 782649A NO 782649 A NO782649 A NO 782649A NO 150125 B NO150125 B NO 150125B
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- starch
- glue
- paper
- viscosity
- mpa
- Prior art date
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- 238000000034 method Methods 0.000 title claims description 4
- 241001503987 Clematis vitalba Species 0.000 title 1
- 229920002472 Starch Polymers 0.000 claims description 80
- 235000019698 starch Nutrition 0.000 claims description 76
- 239000008107 starch Substances 0.000 claims description 68
- 239000003292 glue Substances 0.000 claims description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 239000000853 adhesive Substances 0.000 claims description 22
- 230000001070 adhesive effect Effects 0.000 claims description 22
- 239000002002 slurry Substances 0.000 claims description 21
- 239000000654 additive Substances 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 229910021538 borax Inorganic materials 0.000 claims description 5
- 239000012764 mineral filler Substances 0.000 claims description 5
- 239000004328 sodium tetraborate Substances 0.000 claims description 5
- 235000010339 sodium tetraborate Nutrition 0.000 claims description 5
- 238000003756 stirring Methods 0.000 claims description 5
- 239000006185 dispersion Substances 0.000 claims description 4
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims description 3
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims description 3
- 229920003002 synthetic resin Polymers 0.000 claims description 3
- 150000007529 inorganic bases Chemical class 0.000 claims description 2
- 229920001059 synthetic polymer Polymers 0.000 claims description 2
- 239000000057 synthetic resin Substances 0.000 claims description 2
- 230000032050 esterification Effects 0.000 claims 1
- 238000005886 esterification reaction Methods 0.000 claims 1
- 238000006266 etherification reaction Methods 0.000 claims 1
- 230000003647 oxidation Effects 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 claims 1
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 description 12
- 238000004026 adhesive bonding Methods 0.000 description 12
- 229920000881 Modified starch Polymers 0.000 description 7
- 239000000203 mixture Substances 0.000 description 7
- 235000019426 modified starch Nutrition 0.000 description 7
- 229920000642 polymer Polymers 0.000 description 7
- 239000005995 Aluminium silicate Substances 0.000 description 6
- 229920001353 Dextrin Polymers 0.000 description 6
- 239000004375 Dextrin Substances 0.000 description 6
- 235000012211 aluminium silicate Nutrition 0.000 description 6
- 235000019425 dextrin Nutrition 0.000 description 6
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- 235000013339 cereals Nutrition 0.000 description 5
- 239000002253 acid Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000003860 storage Methods 0.000 description 4
- 229940100445 wheat starch Drugs 0.000 description 4
- 239000011118 polyvinyl acetate Substances 0.000 description 3
- 229920002689 polyvinyl acetate Polymers 0.000 description 3
- 239000000047 product Substances 0.000 description 3
- 102000004169 proteins and genes Human genes 0.000 description 3
- 108090000623 proteins and genes Proteins 0.000 description 3
- 229920000856 Amylose Polymers 0.000 description 2
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 description 2
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- WQZGKKKJIJFFOK-GASJEMHNSA-N Glucose Natural products OC[C@H]1OC(O)[C@H](O)[C@@H](O)[C@@H]1O WQZGKKKJIJFFOK-GASJEMHNSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- 229920001807 Urea-formaldehyde Polymers 0.000 description 2
- 238000010521 absorption reaction Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 150000002148 esters Chemical class 0.000 description 2
- 150000002170 ethers Chemical class 0.000 description 2
- 235000013312 flour Nutrition 0.000 description 2
- 239000008103 glucose Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 239000000843 powder Substances 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- -1 sodium hydroxide Chemical class 0.000 description 2
- 229920000945 Amylopectin Polymers 0.000 description 1
- 229920002261 Corn starch Polymers 0.000 description 1
- 239000004368 Modified starch Substances 0.000 description 1
- 240000007594 Oryza sativa Species 0.000 description 1
- 235000007164 Oryza sativa Nutrition 0.000 description 1
- 229910019142 PO4 Inorganic materials 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000005708 Sodium hypochlorite Substances 0.000 description 1
- 244000061456 Solanum tuberosum Species 0.000 description 1
- 235000002595 Solanum tuberosum Nutrition 0.000 description 1
- 241000209140 Triticum Species 0.000 description 1
- 235000021307 Triticum Nutrition 0.000 description 1
- 240000008042 Zea mays Species 0.000 description 1
- 235000005824 Zea mays ssp. parviglumis Nutrition 0.000 description 1
- 235000002017 Zea mays subsp mays Nutrition 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 150000001242 acetic acid derivatives Chemical class 0.000 description 1
- 238000005054 agglomeration Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- GZCGUPFRVQAUEE-SLPGGIOYSA-N aldehydo-D-glucose Chemical compound OC[C@@H](O)[C@@H](O)[C@H](O)[C@@H](O)C=O GZCGUPFRVQAUEE-SLPGGIOYSA-N 0.000 description 1
- 239000010426 asphalt Substances 0.000 description 1
- ZJRXSAYFZMGQFP-UHFFFAOYSA-N barium peroxide Chemical compound [Ba+2].[O-][O-] ZJRXSAYFZMGQFP-UHFFFAOYSA-N 0.000 description 1
- 238000009835 boiling Methods 0.000 description 1
- 229910000019 calcium carbonate Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 235000005822 corn Nutrition 0.000 description 1
- 239000008120 corn starch Substances 0.000 description 1
- 229940099112 cornstarch Drugs 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 239000004815 dispersion polymer Substances 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 239000012213 gelatinous substance Substances 0.000 description 1
- 125000002791 glucosyl group Chemical group C1([C@H](O)[C@@H](O)[C@H](O)[C@H](O1)CO)* 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000003301 hydrolyzing effect Effects 0.000 description 1
- 230000002427 irreversible effect Effects 0.000 description 1
- 230000002906 microbiologic effect Effects 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 235000013808 oxidized starch Nutrition 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 235000021317 phosphate Nutrition 0.000 description 1
- 150000003013 phosphoric acid derivatives Chemical class 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 239000002952 polymeric resin Substances 0.000 description 1
- USHAGKDGDHPEEY-UHFFFAOYSA-L potassium persulfate Chemical compound [K+].[K+].[O-]S(=O)(=O)OOS([O-])(=O)=O USHAGKDGDHPEEY-UHFFFAOYSA-L 0.000 description 1
- 229920001592 potato starch Polymers 0.000 description 1
- 235000012015 potatoes Nutrition 0.000 description 1
- 239000002244 precipitate Substances 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 235000009566 rice Nutrition 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 1
- PFUVRDFDKPNGAV-UHFFFAOYSA-N sodium peroxide Chemical compound [Na+].[Na+].[O-][O-] PFUVRDFDKPNGAV-UHFFFAOYSA-N 0.000 description 1
- 239000000454 talc Substances 0.000 description 1
- 229910052623 talc Inorganic materials 0.000 description 1
- 230000000930 thermomechanical effect Effects 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J103/00—Adhesives based on starch, amylose or amylopectin or on their derivatives or degradation products
- C09J103/02—Starch; Degradation products thereof, e.g. dextrin
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
- C08L2666/02—Organic macromolecular compounds, natural resins, waxes or and bituminous materials
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2666/00—Composition of polymers characterized by a further compound in the blend, being organic macromolecular compounds, natural resins, waxes or and bituminous materials, non-macromolecular organic substances, inorganic substances or characterized by their function in the composition
- C08L2666/54—Inorganic substances
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Adhesives Or Adhesive Processes (AREA)
- Paper (AREA)
- Medicinal Preparation (AREA)
Description
Foreliggende oppfinnelse vedrører fremstilling av ett hovedsakelig av stivelse bestående papirsekklim av den art som er angitt i kravets ingress og fremgangsmåten er karak- The present invention relates to the production of a paper sack adhesive consisting mainly of starch of the kind specified in the preamble of the claim and the method is charac-
terisert ved at stivelsen bringes i det vesentlige i vann-oppløselig form gjennom omrøring av en vannoppsle.mning av stivelsen eller av en hovedsakelig stivelse inneholdende stoffsammensetning ved en temperatur av 120-200°C under overtrykk. characterized in that the starch is essentially brought into water-soluble form by stirring a water slurry of the starch or of a material composition mainly containing starch at a temperature of 120-200°C under positive pressure.
Ettersom papirsekker er masseartikler med hvilke anvendelse for forpakningsformål i det minste som delvis baserer seg på de lave priser, er det uvanlig å anvende forholdsvis dyre syntetiske lim, såsom plastlim, ved fremstilling derav. Derimot kjenner man til en rekke limtyper fremstilt av stivelse, hvilke egner seg for liming av papirsekker. En detaljert beskrivelse over stivelses-hoXdige~papirsekklim kan man finne bl.a. i Rudolf Kohlers verk "Starkeklebstoffe", Verlag Paul Parey, Berlin 1971, sidene 54,75-81 og 93-94 og i det av J.A. Radley redigerte verk "Industrial Uses of Starch and Its derivatives", Applied Science Publishers Ltd., London 1976, sidene 11-43. As paper sacks are mass articles whose use for packaging purposes is at least partly based on the low prices, it is unusual to use relatively expensive synthetic glues, such as plastic glue, when manufacturing them. In contrast, a number of types of glue made from starch are known, which are suitable for gluing paper bags. A detailed description of starch-rich~paper bag glue can be found i.a. in Rudolf Kohler's work "Starkeklebstoffe", Verlag Paul Parey, Berlin 1971, pages 54,75-81 and 93-94 and in that of J.A. Radley edited work "Industrial Uses of Starch and Its derivatives", Applied Science Publishers Ltd., London 1976, pages 11-43.
Tidligere anvendte man nesten utelukkende alkaliske boraksholdige dekstrinlim ved fremstillingen av papirsekker. Dekstrinene fremstilles gjennom røstning av stivelse på et varmt underlag ved en temperatur fra 180-200°C eller gjennom å blande en liten mengde syre i stivelsen og røste den erholdte blandingen ved en temperatur fra 130-150°C. Som en følge av denne fremstillingsmåten spaltes de polymere glykosekjedene i stivelsen og man erholder i allminnelighet svakt fargede produkter som er oppløslige i kaldt vann. Dekstrinene inneholder alltid små mengder frigjort glukose. Dekstrinlimet distribueres til forbrukeren enten som pulver, hvilket forbrukeren løser i vann til konsentrerte løsn-inger inneholdende fra 60-70 vekt-% tørrsubstans, eller som bruksholdige løsninger. Limets egenskaper forbedres vanligvis gjennom å tilføre 2-5 vekt-% boraks og 0,5-1 vekt-% natriumhydroksyd, hvorpå det ferdige limet i allminnelighet er alkaliskt med pH fra 9-10. In the past, alkaline dextrin glues containing borax were used almost exclusively in the production of paper sacks. The dextrins are produced by roasting starch on a hot surface at a temperature of 180-200°C or by mixing a small amount of acid in the starch and roasting the resulting mixture at a temperature of 130-150°C. As a result of this production method, the polymeric glucose chains in the starch are split and you generally obtain weakly colored products which are soluble in cold water. The dextrins always contain small amounts of liberated glucose. The dextrin glue is distributed to the consumer either as a powder, which the consumer dissolves in water to form concentrated solutions containing from 60-70% by weight dry substance, or as ready-to-use solutions. The properties of the glue are usually improved by adding 2-5% by weight of borax and 0.5-1% by weight of sodium hydroxide, after which the finished glue is generally alkaline with a pH of 9-10.
Senere har man gått over til å anvende stivelseslim, i hvilket spaltninger av stivelsens polymere kjeder skjer i betydelig mindre grad enn hos dekstrinene og i hvilke derfor oppviser en betydlig dårligere op<p>løslighet i vann. Man kjenner også til fra såkalte syrestivelser fremstilte lim. Disse stivelses-modifikasjoner fremstilles gjennom oppsleming av stivelsen i vann, tilførsel av en passende syre og opphetning av den erholdte oppslejnningen til en temperatur på maksimalt 80°C. Later, people switched to using starch glue, in which cleavage of the starch's polymeric chains occurs to a significantly lesser extent than in the case of dextrins and in which therefore exhibit a significantly poorer solubility in water. Glues made from so-called acid starches are also known. These starch modifications are produced by slurrying the starch in water, adding a suitable acid and heating the obtained slurry to a temperature of a maximum of 80°C.
De erholdte produktene løser seg i allminnelighet bare i varmt vann og de anvendes for liming av papirsekker i form av løsning-er inneholdende i allminnelighet 10-25 vekt-% tørrsubstans. Det er likeledes kjent å anvende okyderte stivelser for liming av papirsekker. Disse modifiserte stivelser fremstilles gjennom å danne en oppslemning av stivelsen i vann og behandle denne med oksyderende middel, såsom J-iydrogenperoksyd- natriumperoksyd , kaliumpersulfat, bariumperoksyd eller natriumhypoklorit, hvorved pH i allminnelighet er over 7 og temperaturen er lavere enn gelatin-eringstemperaturen for den anvendte stivelsen, d.v.s. i allminnelighet under 60°C. Vannoppløsligheten av de oksyderende stivelser kommer an på mengden oksydasjonsmiddel, behandlingstiden og temperaturen. Visse produkter er oppløselige t.o.m. i kaldt vann, også under dannelse av temmelig svake løsninger, visse løser seg gjennom koking i vann. Brukskonsentrasjonen av limet er i allminnelighet 15-20 %. The products obtained generally only dissolve in hot water and they are used for gluing paper bags in the form of a solution containing generally 10-25% by weight of dry substance. It is also known to use oxydated starches for gluing paper bags. These modified starches are prepared by forming a slurry of the starch in water and treating this with an oxidizing agent, such as hydrogen peroxide, sodium peroxide, potassium persulfate, barium peroxide or sodium hypochlorite, whereby the pH is generally above 7 and the temperature is lower than the gelatinization temperature of the used the starch, i.e. generally below 60°C. The water solubility of the oxidizing starches depends on the amount of oxidizing agent, the treatment time and the temperature. Certain products are soluble up to in cold water, also during the formation of rather weak solutions, some dissolve by boiling in water. The use concentration of the glue is generally 15-20%.
Vidre er det kjent å anvende kjemisk lengre modifiserte stivelser for liming av papirsekker. Disse er i allminnelighet dyrere enn de enkle stivelses typer, men oppviser bedre limings-egenskaper. Lignende modifiserte stivelser er stivelse-estre og etre, Av de tidligere kan man eksempelvis nevne stivelse-fosfater og acetater, av de senere oksyetylstivelser. Det er vidre kjent å anvende kombinasjoner av modiferte stivelser, f.eks. en blanding av syrestivelse og stivelse-eter sammen med visse tilsetningsstoffer, såsom foreslått i f.eks. US-patent 3.844.807 Furthermore, it is known to use chemically longer modified starches for gluing paper bags. These are generally more expensive than the simple starch types, but exhibit better gluing properties. Similar modified starches are starch esters and ethers, of the former one can for example mention starch phosphates and acetates, of the later oxyethyl starches. It is still known to use combinations of modified starches, e.g. a mixture of acid starch and starch ether together with certain additives, as suggested in e.g. US Patent 3,844,807
(1974). Endelig er det kjent å anvende ulike tilsetningsstoffer ved siden av stivelsen i papirsekklim. Av disse kan man nevne polymere harpikser og dispersjoner som forbedrer limfugens vannresistens, såsom urea-formaldehydharpiks og polyvinylacetat-dispersjoner. (1974). Finally, it is known to use various additives alongside the starch in paper sack glue. Of these, one can mention polymeric resins and dispersions that improve the water resistance of the glue joint, such as urea-formaldehyde resin and polyvinyl acetate dispersions.
Et allment problem forbundet til anvendelsen av stivelseslim A common problem associated with the use of starch glue
er vanskeligheten ved å tilbeiebringe en tilstrekkelig rask festevirkning i begynnelsen av limingen, spesielt i hurtige sekkmaskiner, i hvilke man ikke anvender en forlenget ventetid mellom den langsgående fugens og bunnfugens liming. Fagfolk anvender derfor ofte ett annet lim for liming av bunnfugen enn i den langsgående fuge. Limfugens styrke oppviser også ofte mangeler. is the difficulty in producing a sufficiently fast fastening effect at the beginning of gluing, especially in fast bagging machines, in which an extended waiting time is not used between the gluing of the longitudinal joint and the bottom joint. Professionals therefore often use a different glue for gluing the bottom joint than in the longitudinal joint. The strength of the glue joint also often shows deficiencies.
En vanskelighet ligger i limets viskositet, hvilken kan bli for høy. Selv om det i dette tilfelle er mulig å spe ut limet med vann, øker samtidig den mengde vann som må avdunstes fra fugen. A difficulty lies in the glue's viscosity, which can be too high. Although in this case it is possible to dilute the glue with water, the amount of water that must evaporate from the joint increases at the same time.
- En upraktisk modifisering av foreliggende stivelse, liksom en for høy eller for lav viskositet hos limet med letthet tilveiebringer at limet drypper i sekkmaskinen. Dessuten er limviskositetens-stabilitet såvel under mekanisk belastning som under eventuell for-varing meget dårlig. Endelig kan man konstatere at de fleste sti\ elselim har en for "lang" struktur, hvilket på fagspråket be- - An impractical modification of the existing starch, as well as a too high or too low viscosity of the glue easily causes the glue to drip in the bag machine. Furthermore, the stability of the adhesive viscosity both under mechanical stress and during possible storage is very poor. Finally, it can be stated that most sti\elselims have a too "long" structure, which in technical parlance means
tyr at en limstreng kan tøyes til en betydelig lengde uten at strengen brister. En stor del av ovenfornevnte vanskeligheter er åpenbart en følge av at de i de kjente stivelsesholdige papir-sekklimene, med unntak av dekstrinlim, at stivelsens polymer-struktur karakteristiske tverrbindinger mellom polymerkjedene til en stor del er uforandret selv etter de reaksjoner som skjer ved fremstillingen av den modifiserte stivelsen. Dette indik-eres også av ufordelaktig retrogradering av de som anvendte svakt hydrolyserende eller modifiserende stivelser av sekklim hvilken retrogradering skjer da limet avkjøles f.eks. under lagring. Denne benevnelse har blitt gitt til den i varm vannoppløsing oppløste stivelsens delvise utskilling såsom en uløslig fellning så oppløsningen kjøles. Utskillingen er irrever-sibel og en følge av den i stivelsen inngående rettkjedede amy-losens utkrystallisering og agglomerasjon. means that a string of glue can be stretched to a considerable length without the string breaking. A large part of the above-mentioned difficulties is obviously a consequence of the fact that in the known starch-containing paper sack glues, with the exception of dextrin glue, the characteristic crosslinks between the polymer chains of the starch polymer structure are largely unchanged even after the reactions that take place during the production of the modified starch. This is also indicated by disadvantageous retrogradation of those who used weakly hydrolysing or modifying starches of bag glue, which retrogradation occurs when the glue cools, e.g. during storage. This term has been given to the partial separation of starch dissolved in hot water solution as an insoluble precipitate as the solution cools. The separation is irreversible and a consequence of the crystallization and agglomeration of the straight-chain amylose contained in the starch.
Hensikten med foreliggende oppfinnelse er å tilveiebringe The purpose of the present invention is to provide
et hovedsakelig av stivelse fremstilt lim som egner seg for liming av papirsekker også på raske sekkmaskiner, hvilket lim oppviser en god begynnelsefesteevne og gir en sterk limfuge, - et papirsekklim, hvilket like vel kan anvendes for liming av alle sekkfuger og hvor viskositet lett kan holdes innenfor et for sekkmaskinen passende viskositetsintervall og hvilken viskositet i praksis holder seg uforandret selv under langvarig mekanisk behandling og/eller oppbevaring av limet, og hvilket'lim ikke drypper i sekkmaskinen, -et papirsekklim som oppviser en minimal tendens for retrogradering , -et papirsekklim som kan fremstilles i sekkfabrikken fra normal umodifisert stivelse eller fra en i det vesentlige umodifisert stivelse inneholdende stoffsammensetning på en enkel måte. Et slikt lim erholdes ved fremgangsmåten som er sær-preget ved det som er angitt i kravets karakteriserende del. a glue mainly made from starch which is suitable for gluing paper sacks also on fast sack machines, which glue shows good initial adhesion and gives a strong glue joint, - a paper sack glue, which can equally well be used for gluing all sack joints and where viscosity can be easily maintained within a viscosity range suitable for the bag machine and which viscosity in practice remains unchanged even during long-term mechanical treatment and/or storage of the glue, and which glue does not drip in the bag machine, -a paper bag glue that shows a minimal tendency to retrogradation, -a paper bag glue that can be produced in the sack factory from normal unmodified starch or from an essentially unmodified starch containing material composition in a simple way. Such an adhesive is obtained by the method which is characterized by what is stated in the characterizing part of the claim.
Man har observert at når stivelse utrøres i vann til en opp-sl©mning inneholdende 5-30 vekt-% stivelse og denne oppslemningen omrøres i lukket rom ved en temperatur på 12 0-2 0 0°C under overtrykk, hvis størrelse er avhengig av temperaturen og kan være 0,3-1,0 MPa, nedbrytes stivelseskorn og stivelsens to polymere bestanddeler, den rettkjedede amylose og det forgrenede amylopektin, frigjøres fra hverandre. Avhengig av behandlingstiden og temperaturen kan stivelsens glukosepolymerkjeder frigjøre seg helt fra hverandre, hvor ved tverrbindingene mellom kjedene forsvinner. Herved erholdes en serie vandige stivelseoppløsninger, hvilke karakteriseres av en lav viskositet og en betydelig forminsket tendens for retrogradering. Dessuten oppviser de en "kort" struktur, hvilket manifester seg i at . en limstreng brister når denne tøyes noe. Om man blander kraftig en vannoppslemming inneholdende f.eks. 15 vekt-% stivelse ved 160°C ved et overtrykk av 0,7 MPa i noen sekunder, får man en stivelsesopp-løsning, hvor viskositet ved 90°C er 700-1000 mPa s og ved 25°C/ 2000-3000 mPa s målt med et Brookfield-viskosimeter under anvendelse av spindel 4 ved 2 0 omdr./min. It has been observed that when starch is stirred in water to a slurry containing 5-30% by weight of starch and this slurry is stirred in a closed space at a temperature of 120-200°C under positive pressure, the size of which depends of the temperature and can be 0.3-1.0 MPa, starch grains are broken down and the starch's two polymeric constituents, the straight-chain amylose and the branched amylopectin, are released from each other. Depending on the treatment time and temperature, the starch's glucose polymer chains can completely detach from each other, whereupon the cross-links between the chains disappear. This results in a series of aqueous starch solutions, which are characterized by a low viscosity and a significantly reduced tendency for retrogradation. Moreover, they exhibit a "short" structure, which manifests itself in that . an adhesive string breaks when it is stretched somewhat. If you vigorously mix a water slurry containing e.g. 15% by weight of starch at 160°C at an overpressure of 0.7 MPa for a few seconds, a starch solution is obtained, the viscosity of which at 90°C is 700-1000 mPa s and at 25°C/ 2000-3000 mPa s measured with a Brookfield viscometer using spindle 4 at 20 rpm.
Man har nå kunnet konstantere at de gjennom ovenfornevnte varmei-mekaniske behandling fremstilte stivelseoppsleminger enten som sådanne eller sammen med visse tilleggsstoffer for-delaktig kan anvendes for liming av papirsekker i moderne raske papirsekkmaskiner.Videre har man konstatert at det samme lim kan anvendes for liming av såvel sekkens langsgående som tverrgående bunnfuge. Limets viskositet holder seg innenfor et-anved- It has now been established that the starch slurries produced through the above-mentioned heat-mechanical treatment, either as such or together with certain additives, can advantageously be used for gluing paper bags in modern fast paper bag machines. Furthermore, it has been established that the same glue can be used for gluing both the bag's longitudinal and transverse bottom joints. The adhesive's viscosity stays within an
bart viskositetsområde også under langvarig mekanisk belastning, såsom omrøring, pumping, sirkulering i rør og under press i lim-valsehe, som heller ikke tilveiebringer skadelige forandringer ved lagring av limet. Det er inntil videre ikke mulig å gi en helt sikker forklaring på den gode begynnelsefesteevne og den sterke limfugen som erholdes med papirsekklim ifølge foreliggende oppfinnelse, men man antar at da vannet avdunster fra limfugen for-flytter stivelsens polymerkjeder seg igjen nærmere hverandre under samtidig orientering og, tverrbindingene mellom polymerkjedene dannes på nytt. Limet kan tilføres, enten før den varme-mekaniske behandlingen eller deretter, vanligvis anvendte tilsetningsstoffer. Slike tilleggsstoffer er uorganiske baser såsom natriumhydroksyd, hvilke blir tilført før den varme-mekaniske behandlingen senker stivelsens gelatineringstemperatur og muliggjør derigjennom en anvendelse ved lavere temperaturer i den varmemekaniske behandlingen, og hvilke tilført det ferdige limet, gjør overflaten som skal limes sugende og derigjennom påskynder limets inntregning i overflaten. Videre kan man anvende boraks for å begunstige dannelsen av bindinger mellom stivelsens polymerkjeder og karboksymetylcellulose e.l., eller syntetiske eller natur-lige gelatinøse stoffer, for å øke limets viskositet. Ytteligere kan limet ifølge oppfinnelsen tilføres syntetiske harpikser, såsom ureaformaldehyd-harpikser eller en syntetisk polymerdispersjon, så som polyvinylacetat, for å forbedre limfugens vannresistens. bare viscosity range also under long-term mechanical stress, such as stirring, pumping, circulation in pipes and under pressure in glue rollers, which also does not cause harmful changes during storage of the glue. It is not yet possible to give a completely certain explanation for the good initial adhesion and the strong adhesive joint obtained with paper sack glue according to the present invention, but it is assumed that when the water evaporates from the adhesive joint, the polymer chains of the starch move closer to each other again while simultaneously orienting and , the crosslinks between the polymer chains are re-formed. The glue can be added, either before the heat-mechanical treatment or afterwards, usually used additives. Such additives are inorganic bases such as sodium hydroxide, which are added before the heat-mechanical treatment lowers the gelatinization temperature of the starch and thereby enable use at lower temperatures in the heat-mechanical treatment, and which, added to the finished adhesive, make the surface to be glued absorbent and thereby accelerate the adhesive's penetration into the surface. Furthermore, borax can be used to favor the formation of bonds between the polymer chains of the starch and carboxymethyl cellulose etc., or synthetic or natural gelatinous substances, in order to increase the glue's viscosity. Furthermore, the adhesive according to the invention can be added to synthetic resins, such as urea-formaldehyde resins or a synthetic polymer dispersion, such as polyvinyl acetate, in order to improve the water resistance of the adhesive joint.
Limet kan også tilføres, enten før den varmemekaniske behandlingen eller deretter, minerale fyllstoffer såsom kaolin, talkum eller kalsiumkarbonat, hvor formålet er å øke limets tørrsubstans og derigjennom minske den vannmengde som skal avdunstes fra limfugen, og som på den annen side tilføres, før den varmemekaniske behandlingen skiller stivelsekornene fra hverandre ved i vannoppsle.mningen å trenge inn mellom stivelseskornene og derigjennom begunstige en samtidig og like effektiv varmemekanisk behandling av hvert enkelt stivelsekorn. Ytteligere kan de minerale fyllstoffene i det ferdige limet regulere limets absorpsjon i de overflater som skal limes og forhindre en alltfor rask absorpsjon deri. Passende bruksmengder av mineralfyllstoffer av hvilke rekomenderes en anvendelse av kaolin, er 5-30 vekt-% The glue can also be added, either before the heat-mechanical treatment or afterwards, with mineral fillers such as kaolin, talc or calcium carbonate, the purpose of which is to increase the glue's dry substance and thereby reduce the amount of water that must evaporate from the glue joint, and which, on the other hand, is added before the the heat-mechanical treatment separates the starch grains from each other by penetrating the water slurry between the starch grains and thereby favoring a simultaneous and equally effective heat-mechanical treatment of each individual starch grain. Furthermore, the mineral fillers in the finished glue can regulate the glue's absorption in the surfaces to be glued and prevent too rapid absorption therein. Suitable amounts of mineral fillers, of which the use of kaolin is recommended, are 5-30% by weight
av limets tørrsubstans. of the glue's dry substance.
Den varmemekaniske behandlingen av stivelse eller hovedsakelig stivelse innholdende stoffsammensetningen, samt anvendelse av tilleggs- og fyllstoffer anpasses i overenstemmelse med oppfinnelsen, slik at det endelige bruksferdige lims viskositet ligger innenfor viskositetsområdet 700-5000, fortrinnsvis 1000-3000 mPa s målt ved 25°C med et Brookfield-viskosimeter, spindel 4 .ved 2 0 omdr./ min. Disse vilkår begrenser bl.a bruksmengdene av de på viskositeten innvirkende tilleggs-stof f er, slik at man kan anvende maksimum 2 vekt-% natriumhydroksyd av limets tørrsubstans, boraks maksimum 10 vekt-% og likeledes karboksymetylcellulose maksimum 10 vekt-%. Minerale fyllstoffer, såsom kaolin, har liten innvirkning på limets viskositet. The heat-mechanical treatment of starch or mainly starch-containing material composition, as well as the use of additives and fillers is adapted in accordance with the invention, so that the viscosity of the final ready-to-use adhesive lies within the viscosity range 700-5000, preferably 1000-3000 mPa s measured at 25°C with a Brookfield viscometer, spindle 4 .at 2 0 rev/ min. These conditions limit, among other things, the quantities used of the viscosity-influencing additives f, so that a maximum of 2% by weight of sodium hydroxide of the dry substance of the glue, a maximum of 10% by weight of borax and a maximum of 10% by weight of carboxymethyl cellulose can also be used. Mineral fillers, such as kaolin, have little effect on the glue's viscosity.
Vannoppslemningen av den varmemekaniske behandlede stivelsen eller hovedsakelig stivelse inneholdende stoffsammensetningen kan også tørkes på kjent måte til et sådant tørrinnhold at man erholder et pulver som er lett å pakke og transportere og som er resistent mot mikrobiologisk nedbrytning. Oppfinnelsen avser således også tørkede, på ovenfornevnte måte varmemekanisk behandlede, stivelse eller hovedsakelig stivelse inneholdende papirsekklim. The water slurry of the heat-mechanically treated starch or mainly starch-containing material composition can also be dried in a known manner to such a dry content that a powder is obtained which is easy to pack and transport and which is resistant to microbiological degradation. The invention thus also relates to dried, heat-mechanically treated in the above-mentioned manner, starch or mainly starch-containing paper sack glue.
Ovenfornevnte varmemekaniske behandling kan anvendes for hvilken som helst type av stivelse eller stivelsesderivat, hvorfor man som råmateriale kan anvende vanlige råstivelser, såsom hvete, mais, poteter og ristivelser eller modifiserte stivelser, såsom oksyderte stivelser, stivelses-estre og etre, Såsom den hoved-sakelige stivelse inneholdene komponenten av limet kan man også anvende varmemekanisk behandlet mel av korn . i hvilket stivelseandelen av melets tørrinnhold er over 60 vekt-%, eller en ved hvetestivelsesfremstillingen erholdt stivelsefraksjon som foruten stivelse inneholder 1-8 vekt-% pentosaner og 1-10 vektf % proteiner av fraksjonens tørrsubstans. De mest fordelaktige råstoffer for papisekklimet ifølge foreliggende oppfinnelse er vanlige umodifiserte stivelser og ovenfornevnte pentosaner og proteiner inneholdende stivelsesfraksjoner. The above-mentioned thermomechanical treatment can be used for any type of starch or starch derivative, which is why one can use common raw starches as raw material, such as wheat, corn, potatoes and rice starches or modified starches, such as oxidized starches, starch esters and ethers, such as the main if starch contains the component of the glue, you can also use heat-mechanically treated grain flour. in which the starch proportion of the flour's dry content is over 60% by weight, or a starch fraction obtained during the production of wheat starch which, in addition to starch, contains 1-8% by weight of pentosans and 1-10% by weight of proteins of the dry substance of the fraction. The most advantageous raw materials for the papyrus climate according to the present invention are ordinary unmodified starches and the above-mentioned pentosans and proteins containing starch fractions.
Oppfinnelsen illustreres med følgende eksempler, hvilke belyser et antall utførelsesformer av oppfinnelsen. The invention is illustrated with the following examples, which illustrate a number of embodiments of the invention.
Eksempel 1 Example 1
15 kg potetstivelsé oppslemmes i 85 1 vann og oppslemmingen oppvarmes under omrøring ved 16 0°C under et overtrykk av 0,7 MPa under en tid av tre sekunder med direkte damp. Den erholdte limoppslemningens tørrinnhold var 14 vekt-% og viskositet ca 2000 mPa s målt ved 25°C med et Brookfield-viskosimeter under anvendelse av spindel 4 og 20 omdr./ min. Limprøver ble gjort med papirsekkpapir under anvendelse av en 60 um tykk limfuge med en bredde på 50 mm. Limfugens styrke ble bestemt gjennom å måle den kraft som behøvdes for å løsgjøre limoverflaten fra hverandre ved hjelp av en Alwtron-anordning med en trekkhastighet på 100 mm/min. Følgende resultat ble erholdt: 15 kg of potato starch is slurried in 85 1 of water and the slurry is heated with stirring at 160°C under an overpressure of 0.7 MPa for a period of three seconds with direct steam. The dry content of the adhesive slurry obtained was 14% by weight and viscosity about 2000 mPa s measured at 25°C with a Brookfield viscometer using spindle 4 and 20 rpm. Adhesive tests were done with paper sack paper using a 60 µm thick adhesive joint with a width of 50 mm. The strength of the adhesive joint was determined by measuring the force required to separate the adhesive surface from each other using an Alwtron device with a pulling speed of 100 mm/min. The following results were obtained:
Eksempel 2 Example 2
15 kg hvetestivelse og 2,4 kg kaolin ble oppslemmet i 84 1 vann og oppslemmingen ble behandlet med direkte damp ifølge eksempel 1. Den erholdte limoppslemmingens tørrinnhold var 16 vekt-% og viskositet ca 2200 mPa s målt ved 25°C. Ved målt av limfugens styrke i Alwtron-anoraningen ble følgende resultater erholdt: 15 kg of wheat starch and 2.4 kg of kaolin were slurried in 84 1 of water and the slurry was treated with direct steam according to example 1. The dry content of the resulting glue slurry was 16% by weight and viscosity about 2200 mPa s measured at 25°C. When measuring the strength of the adhesive joint in the Alwtron anoran, the following results were obtained:
Limets viskositet målt i en papirsekkmaskin på ulike limvalser ved at limet underkastes en mekanisk belastning av varierende størrelse. Følgende resultater ble erholdt: The glue's viscosity measured in a paper bag machine on different glue rollers by subjecting the glue to a mechanical load of varying magnitude. The following results were obtained:
En viskositets minskning under mekanisk belastning er i allminnelighet karakteristisk for stivelseslim, men forsøkene i papirmaskinen viste at viskositeten ble holdt ualminnelig vel innenfor det ønskede viskositetsintervallet. A decrease in viscosity under mechanical stress is generally characteristic of starch glue, but the experiments in the paper machine showed that the viscosity was kept unusually well within the desired viscosity interval.
Da tørrinnholdet av limet ifølge foreliggende eksempel ble When the dry content of the glue according to the present example was
o variert mellom 14-18 vekt-% og brukstemperaturen 22-32 C/kunne man konstatere at limets viskositet holdt seg innenfor det be-grensede viskositetsområdet: o varied between 14-18% by weight and the use temperature 22-32 C/ it was possible to ascertain that the glue's viscosity stayed within the limited viscosity range:
Eksempel 3 Example 3
15 kg maisstivelse oppslemmes i 80 1 vann og i oppslemmingen blandes 0,15 kg natriumhydroksyd såsom en 15 vekt-%:ig vannoppløsning. Oppslemmingen ble behandlet med direkte damp ifølge foreliggende eksempel 1 ved en temperatur av 130°C. Tørr-innholdet hos den erholdte limoppslemmingen var 14 vekt-% og viskositeten 2000-2200 mPa s målt ved 25°C. Limoppslemmingen tilføres 10 vekt-%, regnet av den totale limmengden, av en i handelen forekommende vanlig polyvinylacetat-dispersjon. Lim-forsøkene ble utført ifølge eksempel 1 gjennom å anvende bi-tumen-behandlet papir i de overflater som skulle limes. For limfugens styrke ble følgende resultater erholdt:. 15 kg of cornstarch is slurried in 80 1 of water and 0.15 kg of sodium hydroxide is mixed into the slurry as a 15% by weight water solution. The slurry was treated with direct steam according to present example 1 at a temperature of 130°C. The dry content of the resulting adhesive slurry was 14% by weight and the viscosity 2000-2200 mPa s measured at 25°C. The adhesive slurry is supplied with 10% by weight, calculated from the total amount of adhesive, of a commercially available ordinary polyvinyl acetate dispersion. The glue tests were carried out according to example 1 by using bitumen-treated paper in the surfaces to be glued. The following results were obtained for the strength of the glue joint:
Ved anvendelse av polyetenbelagt papir i limforsøket ble for samme lim følgende verdier erholdt: When polyethylene-coated paper was used in the glue test, the following values were obtained for the same glue:
Eksempel 4 Example 4
15 kg hvetestivelse og 2,5 kg kaolin oppslemmes i 85 1 vann og den erholdte oppslemmingen ble behandlet ifølge eksempel 1 15 kg of wheat starch and 2.5 kg of kaolin are slurried in 85 1 of water and the resulting slurry was treated according to example 1
med direkte damp ved en temperatur av 145°C. Den erholdte limoppslemmingens viskositet var 3500-4000 mPa s målt . ved 25°C. with direct steam at a temperature of 145°C. The viscosity of the glue slurry obtained was 3500-4000 mPa s measured. at 25°C.
Eksempel 5 Example 5
13 kg av en hvetestivelsefraksjon som foruten stivelse inneholder 3,4 vekt-% pentosaner og 4,3 vekt-% proteiner oppslemmes i 85 1 vann og behandles ifølge eksempel 1 med direkte damp ved 160°C. Deretter ble 2,5 kg kaolin innblandet i oppslemmingen. Limets viskositet var 1000-1500 mPa s, målt ved 25°C. 13 kg of a wheat starch fraction which, in addition to starch, contains 3.4% by weight of pentosans and 4.3% by weight of proteins is slurried in 85 1 of water and treated according to example 1 with direct steam at 160°C. Then 2.5 kg of kaolin was mixed into the slurry. The viscosity of the glue was 1000-1500 mPa s, measured at 25°C.
Claims (1)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI772355A FI61319C (en) | 1977-08-03 | 1977-08-03 | FOERFARANDE FOER FRAMSTAELLNING AV HUVUDSAKLIGEN AV STAERKELSEBESTAOENDE PAPPERSSAECKSLIM |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| NO782649L NO782649L (en) | 1979-02-06 |
| NO150125B true NO150125B (en) | 1984-05-14 |
| NO150125C NO150125C (en) | 1984-08-22 |
Family
ID=8510998
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO782649A NO150125C (en) | 1977-08-03 | 1978-08-02 | PROCEDURE FOR MANUFACTURING PAPER CLIMBER MAINLY EXISTING OF STARCH |
Country Status (7)
| Country | Link |
|---|---|
| AT (1) | AT358691B (en) |
| DE (1) | DE2820320A1 (en) |
| FI (1) | FI61319C (en) |
| FR (1) | FR2399471A1 (en) |
| GB (1) | GB1559667A (en) |
| NO (1) | NO150125C (en) |
| SE (1) | SE442405B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE502192C2 (en) * | 1990-12-11 | 1995-09-11 | Eka Nobel Ab | Starch soln. prepn. using cold water - by mixing starch with sufficient shear to break up agglomerates, heating and keeping hot until max. viscosity has passed |
| DE102010026241A1 (en) | 2010-06-28 | 2011-12-29 | Mondi Ag | Sack with a designed for dissolution in a humid environment bag wall and use of the bag as a cement bag |
| DE102014006649A1 (en) * | 2014-05-07 | 2015-11-12 | Dy-Pack Verpackungen Gustav Dyckerhoff Gmbh | Paper sack and glue for its production |
| CN114106732A (en) * | 2021-12-31 | 2022-03-01 | 珠海科技学院 | Degradable adhesive and preparation method and application thereof |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3133836A (en) * | 1962-03-26 | 1964-05-19 | Penick & Ford Ltd | Method of treating starch with steam |
| FR2306247A1 (en) * | 1975-04-01 | 1976-10-29 | Vehnae Ab Oy | Starch based adhesive prepn. for corrugated cardboard - by heating non-gelatinised starch slurry below gel temp. to specified viscosity |
-
1977
- 1977-08-03 FI FI772355A patent/FI61319C/en not_active IP Right Cessation
-
1978
- 1978-04-07 GB GB13707/78A patent/GB1559667A/en not_active Expired
- 1978-04-19 SE SE7804484A patent/SE442405B/en not_active IP Right Cessation
- 1978-05-10 DE DE19782820320 patent/DE2820320A1/en active Granted
- 1978-05-17 AT AT357878A patent/AT358691B/en not_active IP Right Cessation
- 1978-08-02 NO NO782649A patent/NO150125C/en unknown
- 1978-08-02 FR FR7822796A patent/FR2399471A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| NO150125C (en) | 1984-08-22 |
| FI61319C (en) | 1982-07-12 |
| FR2399471A1 (en) | 1979-03-02 |
| SE442405B (en) | 1985-12-23 |
| FR2399471B1 (en) | 1983-03-04 |
| DE2820320C2 (en) | 1991-12-19 |
| AT358691B (en) | 1980-09-25 |
| GB1559667A (en) | 1980-01-23 |
| SE7804484L (en) | 1979-02-04 |
| NO782649L (en) | 1979-02-06 |
| FI61319B (en) | 1982-03-31 |
| ATA357878A (en) | 1980-02-15 |
| FI772355A (en) | 1979-02-04 |
| DE2820320A1 (en) | 1979-02-15 |
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