GB2283989A

GB2283989A - Making paper from banana fibres

Info

Publication number: GB2283989A
Application number: GB9323858A
Authority: GB
Inventors: Tsang-Hai Lee
Original assignee: JIN YUAN PAPER CORP
Current assignee: JIN YUAN PAPER CORP
Priority date: 1993-11-19
Filing date: 1993-11-19
Publication date: 1995-05-24
Anticipated expiration: 2013-11-19
Also published as: GB9323858D0; GB2283989B

Abstract

High quality paper, eg security paper, electrical insulating paper, carbon paper, is made from banana fibres from the stems, trunk and leaves of the plant by a method which includes cutting into chips, pithing and degumming by a mechanical and chemical treatment followed by washing and pressing, digesting, cleaning, bleaching and making the paper.

Description

METHOD OF PAPER MAKING FROM BANANA FIBER FIELD OF THE INVENTION This invention relates to a method of paper making from stem, trunk and leave of banana (hereinafter referred to as "banana fiber") which serves as the main material.

BACKGROUND OF THE INVENTION The conventional pulping method used in banana fiber paper mill relates to alkaline process in common and relates to the production of non-bleaching pulp for making into packing bags. The process of such method lies in the use of 100% banana fiber and cooking conditions as follows: caustic soda 12% (NaOH), maximum temperature 150t:, duration of 3 hours, liquid ratio 4.2; mix cooking (dogwood, banana dreg, tiger-lily, peach, etc.) conditions: NaOH 12%, liquid ratio 3.3, maximum temperature 155x:, duration of 3 hours, or NaOH 10%, S2 1%, maximum temperature 155x:, duration of 4 hours.

Sodium sulphate process relates to cooking conditions as follows: NaOH 5.4%, Na.S 2.6%, maximum temperature 160t:, duration of 3 hours, liquid ratio 4.0, or NaOH 7.5%, Na2S 4%, maximum temperature 155cm, duration of 4 hours.

Generally speaking, the advantages of banana fiber are known as follows: Its physical tension stress is nearly 2-fold higher than kraft pulp, and what's more its twist resistance is 10-fold higher than triangular orchid. 2-fold higher than flax and sisal, and little higher than manila bast (manila bast 8000 - 9000 cycles while banana fiber up to 9600 - 11500 cycles, that is very rare in particular), and with respect to top destructive force, slashing force and other kinds of paper strengths, it also has superior characteristics. Meanwhhile it also has been evidenced that the mix of banana stem, trunk and leave can be provided for pulping and paper making in much more convenient manner than the treatment of other materials such as timber, bamboo. Besides, its gum and glaze contents can be converted into gum substance for saving sizing consumption as needed for making water-proof and compact paper sheets.

With reference to the aforesaid analysis, the object of making banana fiber into high-quality paper sheets can be accomplished, such as electrical insulating paper, security paper, clear paper, thermal paper, carbon paper, high-quality blueprint paper, and Bible paper.

The present invention will be better understood through the embodiment of electrical insulating paper as below.

DETAILED DESCRIPTION OF PREFERRED EMBODIMENT Electrical insulating paper is a kind of insulation that is necessary for the manufacture of power machine.

For the production of electrical insulating paper, long wire paper machine is most common in Europe while circular wire paper machine is most widely used in America and Japan in order to achieve a high ratio of paper longitudinal- horizontal tensile strength (to form paper longitudinal- horizontal tensile strength ratio at 10 and adjustable too so that they will become most suitable for making electrical insulating paper).

Generally speaking, greater base weight should use round wire paper machine while higher consistency and thinner in thickness should use long wire machine. Electrical insulating paper is most often not to be indicated by base weight but is indicated by consistency and thickness, such as approixmate base weight (1000 = lmm) is obtained from thickness (ill) x consistency (g/cm3), that is easy for control during the process.

Related manufacturing process to the present invention will be detailed as follows: 1. Raw materials: the mix of banana stem, trunk and leave, Placed on the farm field for drying with sunlight (moisture content no more than 20%), packing in bundle for delivery to paper mill where good ventilation is arranged for storage and yet more than 20S moisture content will be sent to prompt treatment on spot.

2. Chopping: Chopping banana fiber into chips less than 1" long by using the same model as for cutting grass at 24" wide while little higher speed at 320r.p.m., capacity of 1.5ton/hr.

3. Pithing/de--gumming: Using a 25M3 Slush maker for processing the same as chemical-mechanical (AQB) pulping, temperature at 95 - 97x:, adding Phosphate chemical for pithing and de-gumming; after treatment, washing/screening and condensating through conical screen and cylindrical press, and then for increasing consistency up to 30% - 35% through 3-roll press or screw press.

4. Chest: The volumes for pithing/de-gumming are 7.5M3 (horizontal type) respectively, lining tiles, and the portion of equipment contacting raw materials is the same as pithing portion made of stainless steel.

5. Conveyor: Materials delivered from screw press have consistency of 30 - 35% and are delivered to Digestor by means of screw conveyor and filled into Digestor through belt conveyor (24" wide).

6. Digestor: Dia. 14' and 3/4" steel plate lining 3mm-thick stainless steel sheet, filling chemical solution without adding water (liquid ratio about 2), double-sided venting.

7. Blow Pit: Double-bevel steel plate covering with stainless steel sheet, and in the center bottom having a screw stainless steel conveyor, each Digestor one Pit.

8. Valveless Condensor: dia. 3m x 3m W, sink lining stainless steel sheet 1.5mm thick, housing contacting pulping all made of stainless steel.

9. Gorator: PumP-driven separator, inlet/outlet dia. 6", speed 1750r.p.m., 40HP motor.

10. Disc machine: Speed 1200r.p.m., #700, capacity of 20T/D, single disc, 150HP x 6 pole motor.

11. Cleaner: Centrifugal, pressure 5kg/cm2at least, first-stage pumP dia. 8", second-stage pumP dia. 6" x dia. 4" (outlet), pulp consistency 0.5 - 1%, cleaner 12 x 2, 8" x 3.

12. Bleacher: Slight bleaching, tint resembling non-bleached craft pulp, continuous two stages, first stage hypochlorite, second stage hydrogen peroxide (35 or 50S); after second-stage bleaching, washing through valveless condenser, and bleaching mixer is used for first stage and heating (if for bleaching pulp, adding bleaching liquid only), bleaching agitator speed 130rp.m., and hydrogen peroxide agitator of vertical type, speed 84r.p.m.

13. Refining: For beating, 8101 Clafrin x 2, DDr (250HP) x 2; because paper machine room uses R-2 refiner, pulp contacting will not carry metal ions.

14. Paper cleaning: Single stage, centrifugal type, pressure 3.5kg/cmZ, after cleaning, passing by pressure screen hole 18/1000", or hole dia. 1.5mm. Bleaching liquid and R-2 refiner pulping both enter through cleaner pump inlet. Cleaner pump is provided as paper machine pump.

15. PaPer machine: Long wire multi-cylinder paper machine, and for making the aforesaid security paper, maximum sPeed at 300m/min, having paper sticking roll, productivity 20T/D, without sizing press cylinder, but with round wire paper machine, productivity 6 - lOT/D.

double wire drum (dia. 60") half-sink type.

Multi-cylinder wire 1530 mm wide, wire sieve 70 - 90, and felt is same as for making cigarette paper, cleaning side paper width 1270mm, base weight 180, 25g/mZ, heating cylinder 56" wide, 12' heating cylinder x 1, 8 arranged in line up and down through heating cylinder, double-roll calender x 1, winder x 1, super calender x 1.

The major technical control for the aforesaid process lies in: 1. Pithing/de-gumming: Banana fiber supply (10us dried) 1600kg Liquid chemical concentration 6% (preheated to 87) Liquid ratio 10 Temperature 95 - 97t, 1.5 hour Chemical consumption 6S, hydrogen PhosPhate 2. Boiling: Pithed/degummed materials 10,000kg (100% dried) Sulfite 6 - 12% Caustic soda 2 - 4% Boiling assistant 0.5S (Bursperse) Boiling pressure 7kg/cm2 Liquid ratio 2 Boiling pressure holding 4 hours 3. Bleaching: First stage (NaCl) effective oxygen 1 -2 % Temperature 40x: Pulping consistency 5 - 8% Second stage (H2O2) 0.6% (50%H2 02) Temperature 55 C Hydrogen peroxide aid, magnesium sulfate 0.7kg 40' Be 70kg caustic soda ((100%) lOkg hydrogen peroxide (35%) 130 water 900 1 Total: 1000 1 4. Beating: Consistency 4 - 5% Beating degree 850 SR(20 - 25g/m2) 750 SR(35 - 50g/m2) 60 SR(60 - 80g/m) 45 SR (80g/m2 over) 5. Paper making: Vat consistency 2.5% - 3.5% Super calender treatment linear pressure 125kg/cm2 6. Water consumption: Water Property before bleaching, depending on currency paper or cigarette paper treatment total hardness no more than 40ppm (Ca2C03) Water property after bleaching, pure water conductivity < 1 a Q/cm comparative resistance > 100 x 104 # d cm Ph7 4t/ 0.5 (25 C) The product made through the aforesaid process and technical control is ensured to comply with the requirement for making high-quality pulp.

Claims

WILT T8 CLAIMED IS:

1. A method of making high quality paper sheets from banana fiber by integrating the physical properties of banana fibers with the properties of materials containing gum, wherein the process steps and technical control thereof allow for said high-quality.

2. A method of making currency paper from banana, including the following processes: (1) Raw materials: mixed treatment of banana stem, trunk and leave; (2) Chopping: cutting banana fiber materials into chips less than 1" long; (3) Pithing/degumming: pithing and degumming by using mechanical and chemical treatment, and then washing and condensing through presses; (4) Vat: said pithing and degumming Proceeded within the stainless steel container; (5) Conveyor: delivering materials into Digestor through the screw conveyor belt; (6) Digestor: adding chemicals for boiling; (7) Blow pit: double-bevel steel Plate covering with stainless steel sheet, and in center bottom having a conveyor, each Digestor one Pit; (8) Valveless condenser: for condensing treatment; (9) Gorator: for separating treatment; (10) Grinder: for grinding treatment; (11) Cleaner: centrifugal tuPe pressure cleaning; (12) Bleaching: continuous two-stage bleaching; (13) Refining; (14) Paper cleaning; (15) Paper making.

3. The method of paper making from banana fiber according to claim 2, wherein pithing and degumming process subjected to control technique as follows: Banana fiber supply (100% dried) 1600kg Liquid chemical concentration 5% (preheated to 87t:) Liquid ratio 10 Temperature 95 - 97tic, 1.5 hour Chemical consumption 6%, hydrogen phosphate

4. The method of paper making from banana fiber according to claim 2, wherein Boiling process subjected to control technique as follows: Pithed/degummed materials 10,000kg (100% dried) Sulfite 6 - 12% Caustic soda 2 - 4% Boiling assistant 0.5% (Bursperse) Boiling pressure 7kg/cm2 Liquid ratio 2 Boiling pressure holding 4 hours

5. The method of paper making from banana fiber according to claim 2, wherein Bleaching process subjected to control technique as follows: First stage (NaCl) effective oxygen 1 -2 % Temperature 40t: Pulping consistency 5 - 8% Second stage (H2O2) 0.6% (50%H2O2) Temperature 55t Hydrogen peroxide aid, magnesium sulfate 0.7kg 40' Be 70kg caustic soda ((100%) lOkg hydrogen peroxide (35%) 130 water 900 1 Total: 1000 1

6. The method of paper making from banana fiber according to claim 2, wherein Beating process subjected to control technique as follows: Consistency 4 - 5% Beating degree 85 SR(20 - 25g/mZ) 75 SR(35 - 50g/m2) 60 SR(60 45 SR(80g/m2 over)

7. The method of paper making from banana fiber according to claim 2, wherein Paper making process subjected to control technique as follows: Vat consistency 2.5% - 3.5S Super calender treatment linear pressure 125kg/cm

8. The method of paper making from banana fiber as hereinbefore described.