EP0791683B1 - Method for the production of cellulose pulp - Google Patents

Method for the production of cellulose pulp Download PDF

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Publication number
EP0791683B1
EP0791683B1 EP97200443A EP97200443A EP0791683B1 EP 0791683 B1 EP0791683 B1 EP 0791683B1 EP 97200443 A EP97200443 A EP 97200443A EP 97200443 A EP97200443 A EP 97200443A EP 0791683 B1 EP0791683 B1 EP 0791683B1
Authority
EP
European Patent Office
Prior art keywords
digestion
luffa
cellulose pulp
cellulose
annual
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.)
Expired - Lifetime
Application number
EP97200443A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0791683A1 (en
Inventor
Giuliano Meucci
Claudio Gaggini
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
ASSIDOMAN ITALIA S.P.A.
Original Assignee
Assidoman Italia SpA
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Assidoman Italia SpA filed Critical Assidoman Italia SpA
Publication of EP0791683A1 publication Critical patent/EP0791683A1/en
Application granted granted Critical
Publication of EP0791683B1 publication Critical patent/EP0791683B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • D—TEXTILES; PAPER
    • D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
    • D21C5/00—Other processes for obtaining cellulose, e.g. cooking cotton linters ; Processes characterised by the choice of cellulose-containing starting materials

Definitions

  • the present invention relates to paper production and, in particular, to the production of cellulose pulp for use in papermaking.
  • Fibrous materials means vegetable fibres, that is, the thread-like cells constituting the body of the toughest plant tissues which are destined to form the framework of a future sheet of paper.
  • the criterion by which the suitability of a plant or tree for the production of fibrous material for paper may be judged is very complex and has to take account of both quantitative and qualitative parameters, the most important of which is the amount of cellulose it contains.
  • extraction should be easy the fibres should have suitable technical characteristics and the plant or tree should not have intense coloration or unpleasant odours; amongst the technical characteristics, the tensile index, the tear factor, the bursting index and the freeness are of fundamental importance.
  • Plants and trees used for the production of paper and paper materials can be divided into three main, large categories:
  • Luffa cylindrica is an annual herbaceous plant belonging to the Cucurbitaceae family; Luffa is a creeping, climbing, monoecious plant with unisexual flowers and with stems which may reach lengths of 4-8 m; the leaves are petiolate, simple, alternate, from tri- to hepta-lobate, and 10-15 cm long; the flowers are conspicuous, large (5-10 cm) with a corolla formed by five yellow petals.
  • the fruit is a pepo, dry when mature, cylindrical or only slightly angular, of very variable dimensions (typically 30-60 cm long and 10-20 cm diameter), and straight or curved; when mature, it has a dry and papery epicarp with a fibrous and spongy endocarp owing to the disappearance of the pulp and the persistence solely of the fibro-vascular bundles.
  • a fruit contains on average 200-500 seeds about 10-15 mm long and each weighing about 0.1g; the fibrous reticulum of the mature fruit is composed of cellulose (60%), hemicellulose (29%) and lignin (11%).
  • Luffa is an annual plant with a relatively long cycle; in a mediterranean habitat, from four to five months elapse from germination to the maturation of the fruits, with a first flowering in July and a second flowering in August.
  • Luffa The warmth requirements of Luffa are high: a lethal minimum of 0-2°C, minimum and maximum temperatures for growth of 12-14 and 20-35°C, respectively, with an optimum situated at around 25°C; the water content is 8.12% at 105°C.
  • Luffa is widespread in tropical and subtropical regions where it is generally the subject of domestic horticultural cultivation.
  • the Luffa fruit, dried after removal of the epicarp and the seeds, is commonly sold as a body sponge in shops specializing in natural body-care products, department stores, perfumeries, etc.
  • Luffa fibres One of the most interesting mechanical characteristics of Luffa fibres is in fact their so-called “shape memory” owing to which the fruit can be compressed up to 10-20 times and then returns to its original shape and size if immersed in water or subjected to the effect of steam.
  • the Luffa fruit is also used industrially, practically unchanged, for producing thermally-insulating and sound-absorbent panels, packaging and padding materials, and arch-supports for footwear.
  • Luffa has to be subjected to processing with the object of liberating the fibres from the useless and harmful components, that is, to the processing which, in the papermaking field, takes the name of digestion when chemical agents are used or, on the other hand, grinding when the processing is mechanical.
  • a digestion process is described below, by way of a non-limiting example.
  • the liquor was separated for the analysis and the cellulose pulp was washed with running water to eliminate as much of the exhausted liquor as possible.
  • the fibre yield was 57.82% which itself is an astonishing parameter placing Luffa at the same level as a conifer (the fibre yield of a conifer is normally 50-60%, whereas that of an annual plant is 15-20%).
  • a simplified beating curve was then performed on the crude cellulose pulp in order to assess the behaviour of the fibre and the curves of the physical-mechanical characteristics upon beating. Moreover, a typical bleaching process was carried out on a portion of beaten pulp in two successive stages which, with regard to the reagents used, are represented below: 1) First stage Sodium hypochlorite 6% NaOH 1% Residual hypochlorite 0 Working temperature 45-50°C Duration 60 min 2) Second stage Hydrogen peroxide (oxidizing agent) 3% NaOH (oxidation regulator) 3% Sodium silicate (oxidation regulator) 0.5% Working temperature 65-70°C Duration 180 min N.B.: the quantities relate to the weight of dry cellulose.
  • the methods used were the ATICELCA methods and, where these were lacking, the SCAN methods were used.
  • the freeness of the pulp produced from Luffa is unexpectedly better than that of the best annual plants and similar to that of a broad-leaved tree.
  • the bursting index and the tear factor are clearly better than those of the most common annual plants, whereas the silica content is a great deal lower, as can be seen from the different percentages of ash; only with regard to the tensile index can Luffa be considered equivalent to a good annual plant.
  • Luffa cylindrica is clearly particularly suitable as a starting material for methods for the production of cellulose pulp for use in papermaking; these methods need not be limited solely to digestion processes with soda but may also include all methods in which a vegetable starting material is reduced to fibres or fibre fragments.

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  • Paper (AREA)
  • Laminated Bodies (AREA)
EP97200443A 1996-02-23 1997-02-14 Method for the production of cellulose pulp Expired - Lifetime EP0791683B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT96MI000336A IT1282671B1 (it) 1996-02-23 1996-02-23 Procedimento per la fabbricazione di pasta di cellulosa
ITMI960336 1996-02-23

Publications (2)

Publication Number Publication Date
EP0791683A1 EP0791683A1 (en) 1997-08-27
EP0791683B1 true EP0791683B1 (en) 2000-01-05

Family

ID=11373364

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97200443A Expired - Lifetime EP0791683B1 (en) 1996-02-23 1997-02-14 Method for the production of cellulose pulp

Country Status (6)

Country Link
EP (1) EP0791683B1 (enrdf_load_stackoverflow)
ES (1) ES2142651T3 (enrdf_load_stackoverflow)
GR (1) GR3033055T3 (enrdf_load_stackoverflow)
IT (1) IT1282671B1 (enrdf_load_stackoverflow)
PT (1) PT791683E (enrdf_load_stackoverflow)
TR (1) TR199700149A2 (enrdf_load_stackoverflow)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113201796B (zh) * 2021-04-29 2023-04-28 江苏理工学院 一种丝瓜络纤维的脱胶方法

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2411912A1 (fr) * 1977-12-14 1979-07-13 Allibert Exploitation Procede de traitement des loofahs, et produit resultant de sa mise en oeuvre

Also Published As

Publication number Publication date
GR3033055T3 (en) 2000-08-31
IT1282671B1 (it) 1998-03-31
TR199700149A2 (tr) 1997-09-21
ITMI960336A0 (enrdf_load_stackoverflow) 1996-02-23
ITMI960336A1 (it) 1997-08-23
EP0791683A1 (en) 1997-08-27
PT791683E (pt) 2000-06-30
ES2142651T3 (es) 2000-04-16

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