WO2003012195A1

WO2003012195A1 - Twin headbox for super reinforced web in paper manufacturing

Info

Publication number: WO2003012195A1
Application number: PCT/IB2001/001528
Authority: WO
Inventors: Jose B. J. Garcia
Original assignee: Individual
Current assignee: Individual
Priority date: 2001-07-31
Filing date: 2001-07-31
Publication date: 2003-02-13
Anticipated expiration: 2004-01-31

Abstract

The process of a single layer linerboard paper with a great resistance to breaking, comprises two systems: (I) one which selects the super long fiber from either of the two plants called 'YUTE' or 'BANANA STEM', (2) an apparatus called twin headbox where the super long fiber flowing in a liquid solution through its own independing pipe line, is deposited into one of the chambers (28) of the multiply headbox, and the short fiber from the recycled paper flowing in a liquid solution through a separate pipe line, is deposited into the next chamber (29) of the same twin headbox where the two fibers short and super long blend together and thereafter this mixture is sprayed out in a liquid solution on the fourdrinier where the single layered web starts its formation.

Description

TWIN HEADBOX FOR SUPER

REINFORCED WEB IN PAPER

MANUFACTURING

BACKGROUND OF THE INVENTION

FIELD OF THE INVENTION.

The present invention discloses the art of manufacturing paper and more particularly to an innovative multiply pressurized head box section and the preparation of a super long fiber for the manufacturing of a super reinforced web.

DESCRIPTION OF THE PRIOR ART.

Paper making machines generally obtain virgin pulp from hard and soft wood Kraft to process the fiber by chemical means. To process the fiber, paper mills use equipment to select the fiber like it is done in mills that produce paper out of sugar cane bagasse; mills in general use equipment and chemicals for the stock preparation, fiber cleaning and refining before the stock is pumped into a single or multiply head box, as it is disclosed in Janda ' s and Vinson's , thereafter the fiber in a liquid solution, is sprayed or deposited as a single or multi-layered web on the forming table or crescent former, as it is disclosed in Vinson's and Janda ' s invention.

From its formation at the output of the multiply head box, the web is carried on the crescent former, as it is done in Janda¹ s, or on the wire as disclosed in Vinson's which is an apparatus commonly referred to as "Fourdrinier , " where the water evacuation process begins. Out of the web forming section, the web enters the press section where the web continues to be shaped and formed into the desired product. From the presses the web continues flowing to the dryer section; in Vinson's and Janda ' s the drying and creping is substantially completed in a Yankee dryer with creping doctor blades .

One example of multiply head box is the invention disclosed by Vinson, U.S. Patent No. 5,865,950, entitled "Process for Creping Tissue Paper", issued February 2, 1999. Vinson's invention disclose a multiply head box with three chambers at 180° with the horizontal x-axis, see schematic figure B sheet 2/2, where the blending of the fibers occur at the vertex point of the multiply head box and then sprayed out to the Fourdrinier where the web starts its formation as a multi-layered web or even on layer web.

The main purpose of Vinson in his invention is to process a high quality creped soft tissue paper using high adhesion and doctorability for dry creping.

Vinson uses short fiber from hard wood Kraft and the long fiber from soft Kraft wood to process dry creping tissue paper.

Another example is disclosed by Bruce W. Janda U.S.

Patent No. 5,178,729, entitled HIGH PURITY STRATIFIED TISSUE AND METHOD OF MAKING SAME, issued Jan. 12, 1993.

Janda disclosed a multiple head box divided into two and three sections with appropriate flow path for supplying two and three layers furnished thereto. The multiply head box is' depicted in an angle of approximately 45° see schematic fig. A 2/2 sheet.

• In Janda ' s invention the short fiber comes fro , ard wood Kraft and the so called long fiber from soft Kraft wood, they blend together to produce a high quality soft tissue. The fibers long and short blend as it appears in the design, at the vertex of the multiply head box where the fibers converge, thereafter the fibers which are suspended in a liquid solution, are sprayed out on the crescent former, forming either surface layers of a two or three layered web. The main purpose of Janda in his invention is to process a foam-formed nonlaminated stratified tissue paper dried in a Yankee Dryer provided with doctor blades .

BRIEF DESCRIPTION OF THE INVENTION

In the present invention the paper manufacturing process is performed with recycled waste paper to get the short fiber which works simultaneously with the super long fiber preparation to manufacture a liner board paper strong resistant to breaking, while it is used to transport heavy materials in heavy duty paper sacks or corrugated boxes.

The super long fiber that is pumped into the chamber 28 of the multiply head box through an independing pipe line will get blended with the recycled fiber at the chamber 29 of the twin head box. The recycled fiber is pumped into the chamber 29 through a second pipe line into the multiply head box which is an important part of the present invention.

Figure A, embodiment 500, shown in page 1/2, is a schematic illustrating one embodiment major features of the present invention. The configuration depicted in figure A, comprises the super long fiber preparation equipment and the inlet of the recycled fiber flowing into the chamber 29 of the Twin Head Box.

The super long fiber is sprayed or deposited from the chamber 28 into the chamber 29 of the Twin Head Box where the super long fiber extracted from the "YUTE" or "BANANA STEM" blend together with recycled fiber and then sprayed or deposited as a web of wet paper material on the forming table.

Garcia 's multiply Head box, an important apparatus and part of Garcia 's invention, is a two chamber Head box

95 controlled by a GATE VALVE to shut-off the flow or to control the amount of flow of the super long fiber into the next chamber 29 where the short fibers are in a pressurized liquid solution. The Multiply Head box is depicted in a vertical way as it is shown in the schematic figure C page 2/2. The super

100 long fiber moves in a pressurized liquid solution which is sprayed out through the lip of the chamber 28 into the chamber 29 and not to the vertex of the multiply Head box as it is in the case of Venson and Janda where the fibers converge to blend to form a multiply-layered web. In Garcia 's invention

105 the blending of super long and short fiber occurs at the chamber 29 to be deposited on the wire or forming table 31 in the form of a single layer web; from here the web is carried on to the presses and thereafter to the multiply dryers.

BRIEF DESCRIPTION 110 OF THE DRAWINGS

Other objects of the present invention and many of the attendant advantages of the present invention will be readily accepted as the same becomes better understood by reference to the detailed description when considered in connection with 115 the accompanied drawings in which like reference numerals designate like parts through the figures thereof and wherein.

Figure A, embodiment 500 page 1/2 is a schematic illustrating "major features of the super long fiber preparation" which is an important section of the present 120 invention. Figure A, embodiment 500 page 1/2 is a schematic illustrating major feautures of "The Twin Head Box," which is an important section of the present invention.

PREFERRED EMBODIMENT

125 Figure A, embodiment 500 page 1/2, is a schematic illustrating one preferred embodiment illustrating major feautures of the present invention. The configuration depicted in figure A comprises equipment and features detailed as follows .

130 The raw material 1 which is "YUTE" or "BANANA STEM" or any other substitute with super long fiber, is dumped on the conveyor 2 to enter the ingress 3 to be cut by the slitter blades in sections of 1/4", 1/2", 3/4" or even longer if desired or as needed. Once the Yute has been cut in said

135 sections it enters the ingress of the primary shredder 4 where the shell of the Yute or Banana stem is removed.

The material 1 shreddered is transported by a pallet conveyor 5 to a secondary shredder 6 which will finish what ever work was not accomplished by the primary shredder 4. A

140 third belt conveyor 7 transport the material 1 to a de- fibrator 8 which in turn separates the bundles of the fiber from each other. This de-fibrator 8 finish the job that the shredders 4 and 6 did not accomplish. The stripped material is then transported by a fourth pallet conveyor 9 dumping it

145 into the primary shaker screen 10; this shaker screen is provided with showers to help the screening and selection of the fiber by getting rid of the fragments of the YUTE ' S shell or Banana's fragments.

The rejects from the primary shaker screen 10 flow to a

150 de-fibrator 11. This material keeps on moving transported by a belt conveyor 12 to the shaker screen 13 which in turn dumps the material selected on the conveyor 14 to return the selected material to the secondary shaker screen 15. This material in form of a fiber is dumped into the dump chest 16.

155 from the dump chest 16 which is provided with pump 17, the fiber is pumped to the de-flaker 18 which de-fibrates the bundles of the fiber. The fiber in the dump chest 16 has a consistancy of approximately 14%; when the fiber at 14% consistency is pumped to the de-flaker 18 it is diluted with

160 the help of a consistency regulator control 19 to a consistency of approximately 4% before it enters into the de- flaker 18. From here the fiber flows to the washers 20 and 21 where the fiber is cleaned with the help of showers 22 and 23. the showers are a mix of hot water either with caustic soda or

165 bleach pumped with a pump 33 from the efluent tank 32.

The fiber already cleaned and selected is dumped into a STORAGE TANK 24 which is furnished with agitators and high pressure showers so, the fibers float freely apart from each other in a liquid solution. From this storage tank 24 the

170 fibers are pumped with pump 25 to the first chamber 28 of the twin head box. The pump 25 is connected in the outlet of the pump to a consistency regulator control 26 in order to dilute the fiber to the required consistency before it flows to the first pressurized chamber 28 of the twin head box to continue

175 flowing to the second pressurized chamber 29, where the short fiber from the recycled paper and the super long fiber blend together to be thereafter sprayed or deposited as a single layer web of wet paper material on the fourdrinier or forming table 31, to continue flowing to the presses and drying

180 section.

The line between the storage chest 24 and the inlet of the first chamber 28 of the twin head box, is provided with a bypass 27 to deviate the flowing of the fiber to the second chamber 29 of the twin head box if so desired to obtain a 185 better bond of the fiber on the web,

The pressurized twin head box is provided with a GATE VALVE 30 which will be used to shut-off the flowing of the super long fiber from the chamber 28 into the chamber 29, also to control the speed of the flow from chamber 28 to the 190 chamber 29 and also to shut-off the flowing of the fiber from chamber 29 to chamber 28 if bypass 27 is used to deviate the total flow of the fiber.

this invention has been described herein in considerable detail in order to comply with the Patent

195 statutes and to provide those skilled in the art with information needed to apply the novel principles and to construct and use such specialized components as are required. However, while a particular embodiment of the present invention has been described herein in detail, it is to be

200 understood that various alterations, modifications and substitutions can be made therein without departing from the spirit and scope of the present invention, as defined in the following.

It can be appreciated that goals of the present 205 invention are achieved by each of the features and equipment aforementioned in the preferred embodiment 500, Figure A.

Claims

CLAIMSI CLAIM:

1. A PREPARATION OF THE FIBER FOR THE MANUFACTURING OF A 210 SUPER REINFORCED LINER BOARD PAPER, USING A MULTIPLY HEAD BOX COMPRISING:

(a) At least one set of slitter blades which is a series of slitter blades to cut the raw material (Yute or Banana stem) in sections of 1/4, 1/2, 3/4 or more if needed.

215 Item 3.

(b) At least two sets of shredders where the shell of the Yute ' s of Banana's fragments are removed. Items 4 and 6.

(c) At least two set of de-fibrators which de-fibrate the bundles of the fiber, items 8 andll.

220 (d) At least four belt conveyors, items 2, 7, 12 and 14 and two pallets conveyors, items 5 and 9, used to transport the raw material to the respective apparatus to select the fiber.

(e) At least three shaker screens which clean and 225 select the fibers by means of vibration and pressurized water showers, items 10, 13 and 15.

(f) At least one storage chest (furnished with a pump 17 and a consistency regulator control 19 at the outlet of the chest) to store the fiber which will be pumped to the de-

230 flaker. Item 16.

(g) At least one deflaker which separates the bundles of the fiber. Item 18. (h) At least two washers furnished with water showers 22 and 23, to wash, clean and to -thicken the fiber before it is dumped into a high density storage tank. Items 20 and 21.

(j) At least one HIGH DENSITY STORAGE TANK, item 24, furnished with an agitator, high pressurized water showers, a pump 25 and a consistency regulator control 26, and a bypass line 27 with its respective shut-off valve between the line that flows to the chamber 28 of the twin Head Box and the line of the inlet that comes from the recycled fiber source system into the chamber 29 of the twin head box. The bypass 27 is used to deviate the fiber to the chamber 29 if needed.

(k) At least one tank (with its pump 33) to store the efluent water which is a mix of hot water and either caustic soda or bleach used as showers on the washers. Item 32.

2. A PRESSURIZED MULTIPLY HEAD BOX OR TWIN HEAD BOX COMPRISING:

(a) A twin head box having two chambers, one chamber 28 where the super long fiber flows in a liquid solution before it is sprayed to the second chamber 29 where the two fibers, super long and the recycled fiber blend together.

This Head Box is depicted in a vertical manner with two chambers 28 and 29, separated by a gate valve 30, used to shut-off the flowing of fibers from the chamber 29 into chamber 28 if the recycled fiber or the fiber from virgin pulp out of hard or soft wood is used to manufacture a different kind of paper as well as to control the speed of the flow when super long fiber is used.