US1696896A - Pulp board and process of manufacturing the same - Google Patents

Description

Patented Dec. 25, 1928.

PATENT oFrlc UNITED STATES nnannnr 'rnnononn pares, or mmwoon, SYDNEY, NEW sour]: wms, husrnnu.

PULP BOARD. AND rnoonss or nnnnraornamo THE sum.

H0 Drawing. Application filed April 13, 1927, Serial No. 183,626, and in Australia June 14, 1926.

valuable properties as a pulp for board making, and is applied to that purpose with success. Board, however, made from megass alone is rather brittle when rolled into thin sheets, and thickness increases the cost and weight, and such sheets are more difiicult to dry.

The object of my invention is to provide an improved pulp board in which megass is a largely constituent part, and which will be tougher and lighter, and capable of thin rolling or pressin at the same time having a fine surface. y invention also provides a process of manufacturing the improved pulp board.

A pulp board made according to this invention consists essentially of megass and titree or bark of the ti-tree or both commonly found on swampy land. I have found that the addition of ti-tree or bark eifects a more ra id drying of the finished board.

y process consists in first soaking the megass in a solution of caustic soda to soften and clean it. After soaking, the megass is mixed with finely ground ti-tree and/ or bark of the ti-tree.

I have found that good results are obtained by a mixture of eighty per cent by weight of the megass and twenty per cent of the ti-trce bark although other proportions give satisfactory results.

After the mixing, the pulp is of good consistency and is taken away by conveyors to be boiled in a solutionof caustic soda or lime. This boiling is under steam and takes one to two'hours.

After cooking, the pulp is conveyed on a woven wire belt, and above this belt is another woven wire belt adapted to be lowered on to The board is finished ofi the usual board forming manner and is useful for numerous purposes.

I claim i 1. An improved pulp board comprising finely ground ti-tree.

2. An improved pulp board comprising finely ground ti-tree bark.

3. An improved pul board comprising finely ground ti-tree an ti-tree bark.

4:. An improved pulp board comprising megass; and finely ground ti-tree.

5. An improved pulp board comprising megass; and finely ground ti-tree bark.

6. An improved pulp board comprising megass; and finely ground ti-tree and ti-tree bark.

7. An improved pulp board comprising approximately 80 per cent of megass and twenty per cent of finely ground ti-tree.

8. An improved pulp board comprising approximately 80 per cent of megass and twenty per cent of finely ground ti-tree bark.

9. An improved pulp board comprising approximately 80 per cent of megass and twenty per cent of finely ground ti-tree and ti-tree bark.

10. In a method of manufacturing pulpboard comprising the steps of soaking megass in a caustic soda solution, mixing the megass with ti-tree, grinding the megass and ti-tree, and boiling the mixed megass and ti-tree in a caustic soda solution.

11. In a method of manufacturing pulp board comprising the steps of soaking megass in a caustic soda solution, mixing the megass with ti-tree, grinding the megass and ti-tree, and boiling the mixed megass and ti-tree in a lime solution.

12. In a method of manufacturing pulp board comp-rising the steps of soaking megass in a caustic soda solution, mixing the megass with ti-tree bark, grinding the megass and titree bark, and boiling the mixed megass and ti-tree bark in a caustic soda solution.

13. In a method of manufacturing pulp board comprising the steps of soaking megass in a caustic soda solution, mixing the megass with ti-tree and ti-tree bark, grinding the megass and ti-tree and ti-tree bark, and boiling the mixed megass and ti-tree and ti-tree bark in a caustic soda solution.

14. In a method of manufacturing pulp board comprising the steps of soaking megass in a weak solution of caustic soda, mixing apmentof the substances in the proximately 80 percent of the megass with 20 percent of ground ti-tree, grinding the megass and tie-tree, and boiling the ground megass and ti-tree in a weak caustic soda solution for several hours.

15. In a method of manufacturing pulp board comprising the steps of soaking megass in a weak solution of caustic soda, mixing approximately 80 percent of the megass with 20 percent of ground ti-tree bark, grinding the megass and ti tree bark, and boiling the ground megass and ti-tree bark in a weak caustic soda solution for several hours.

16. In a method of manufacturing pulp board comprising the steps of soaking megass in a weak solution of caustic soda, mixing approximately 80 percent of the megass with 20 percent of ground ti-tree and ti-tree bark, grinding the megass and ti-tree and titree bark, and boiling the ground megass and ti-tree and ti-tree bark in a weak caustic soda solution for several hours.

17. In a method of manufacturing pulp board comprising in conveying the pulp to the presses between parallel woven wire belts, and rapidly moving the belts in intermittent to an ro motions in opposite directions to eachother and moving one belt away from and toward the other belt to provide a read justment of the substances in the pulp.

18. In a method of manufacturing pulp board comprising in conveying the pulp between parallel wire belts, and rapidly moving the belts in intermittent to and fro motions in opposite directions to each other and moving the upper belt rapidly away from and toward the lower belt to provide1 a readjust- 19. In a method of manu iac uring pulp board comprising in conveying the pulp between two parallel foraminiferous belts, and moving the belts in intermittent to and fro motions in opposite directions to each other and at the same time moving the upper belt rapidly away from and toward the lower belt to work the long and coarse fibres of the pulp to the bottom and the fine fibres to the top and the intermediate fibres in regular graduation therebetween.

20. In a method of manufacturing pulp board comprising in arranging the fibres of the pulp so that the long and coarse fibres will be at the bottom and the fine fibres at the top, and the intermediate fibres in regular graduation therebetween.

21. In a method of manufacturing pulp board comprising conveying the pulp between two parallel foraminiferous belts moving in short and rapid reciprocating motions in opposite directions to each other and also one elt rapidly up and down relative to the other belt to arrange the fibres of the pulp.

22. In a method of manufacturing pulp board comprising conveying the pulp between two parallel foraminiferous belts moving in short and'rapid reciprocating motions in opposite directions to each other and the upper belt having a short up and down motion relative to the lower belt to arrange thefibres of the ulp.

23. In a method of manufacturing pulp board comprising conveying the pulp between two parallel foraminiferous belts the upper of which has a short rapid up and down motion relative to the lower belt to arrange the fibres of the pulp. v

In testimony whereof I have affixed my signature.

HERBERT THEODORE PRICE.