US1552036A - Heeling board - Google Patents

Description

Patented Sept. 1, 1925. I

UNITED STATES PATENT OFFICE.-

ALBERT L. CLA'PP, OF DA-NVERS, MASSACHUSETTS, ASSIGNOR TO BECKWITH MANU- FACTURING COMPANY, OF BOSTON, MASSACHUSETTS, A CORPORATION OF MAINE.

HEELING BOARD.

as well as for the manufacture of various.

other articles for use in the arts, by the employment of a paper machine wherein the fibers are felted and sheeted.

A further object of the invention is the utilization of certain waste material resulting from the manufacture of box toes.

In the manufacture of vulco-box toes so-called, which are today used in very large quantities in footwear, a fibrous sheet is produced in which is incorporated, usually by saturation or impregnation, such thermoplastic compounds as bitumens, resins, waxes,

drying oils, and certain resinates. in various combinations or mixtures; which impart stiffness and resiliency to the fibrous bl'ank, which soften upon the application of moderate heat so that the blanlcmay be molded about the end of the last in the pullingover or end-lasting operation, and which set rapidly on being cooled. After the sheet has been formedand saturated or impregnated with the thermo-plastic compound, it

is cut into blanks of. appropriate size and shape to serve as the box-to e stiffeners, and, as such blanks are irregular, there is of necessity a great waste of the raw sheet material in the form of cuttings or scrap. vThe thermo-plastic compound in the scrap material is solid at ordinary temperatures such as shoes may be subjectedto in wear, and are pulverizable or reducible by grind- I have discovered that it is possible to disintegrate the box-toe waste b dry grinding as by the use of an Abbe grinder, and that such an operation may be successfully carried on .occasionally throwing a small quantity (a. handful, for example) of talc into the machine to prevent the thermoplastic compound from sticking to the blades. The effect of the operation. is more or less to separate the felted fibers --usua1ly wool, cotton, hair, etc.,-and to break up 21, 1922. Serial No. 608,357.

the thermo-plastic compound, some of which is thereby freed from the fibers. Since these particles of the compound are of great value in the production of a board according to the present invention, some device must be employed for their recovery and use. 1

I have discovered that tanned leather fibers, when subjected to proper treatment, have the property of entraining' or retaining the particles of thermo-plastic compound. in theipreparation of an aqueous pulp and its formation in a. sheet, and such fibers in addition give to the. finished board the appearance of leather, which is highly desirable.

Further I have found that, in securing optimum results in the production of my new fiber board, it is desirable to employ some fluxing agent, which can be incorporated in the aqueous pulp, for fluxing and fusing the thermo-plastic compound originally contained in the box-toe scrap. For this purpose, Montan wax, because of its low viscositynwhen molten and resultant penetrability, is most desirable.

I shall now give several examples which 1 serve to illustrate my process and my new fiber board.

Example I.I place in a common beatinc engine. such as used for preparing pulp for the manufacture of paper or paper felt, 20 to 35 parts (by weight) of disintegrated tanned leather scraps or chips, '10 to 15 parts of cellulosic material such as sulphite or sulphate pulp or screenings, manila, mixed papers or rope stock, and 30 to 70 parts-of box-toe waste or'scraps the latter having been disintegrated or ground While dry), together with suflicient water to ensure proper circulation of the stock in the beater. The stock is beaten hard for some time, say four to five hours. until it is fairly smooth. (In some cases, the cellulosic material is alone subjected to beating and partial hydration before. the leather. and the box-toe waste are added and beaten.) I now preferably add to the stock, especially where the proportion of box-toe waste and its contained thermo-plastici compound is 410 relatively small, an amount, say 10 parts, of powdered Montan wax or equivalent fluxing agent, which is thoroughly mixed with the stock. Then a precipitating agent (7 parts of powdered alum for exa aluminum resinate which coagulate and pre cellulose fibers is beaten or brushed by the beaten roll into the pulp, and reacts with certain gelatinous portions of the leather, and forms a gelati- 3 rice down free nous precipitate which coagulates, and carparticles of thermo-plastic compound and the particles of Montan wax, if the latter be employed, and fixes them on the fiber. complete and the stock is ina. fine condition, it is now transferred to the paper machine, and sheeted either in a continuous web -by a multi-cylinder machine or in a tube on a wet machine; in which latter case, the

tube is slit and stripped from the make-up size and silicate of soda are added and the fibers.

. cence throughout the sheet, and is thereby thoroughly distributed throughout the mass; whereupon the alum is thoroughly dispersed throughout the-pulp, after which the pulp is sheeted on a paper machine. The function of the lime is toprecipitate the tannin of the leather and restore the color of the leather to its original hue. The silicate of soda and'the rosin size are precipiy alum as aluminum silicate and oipitate the free particles of Montan wax and thermo-plastic compound and fix them on Example III.In this case are used': 20 to 30 parts disintegrated tanned leather, 10 parts sulphate pulp, parts disintegrated box-toe waste, 1 part fine hydrated lime, 2 parts bichromate of soda and/or 1 part sodium carbonate, 5 parts rosin size, 7 parts 'l/Vhen the precipitation is alum.

Substantially the same procedure is followed as in Example II. The soda ash and/orbichromate of soda are added to the beater coincidently with the-limel -and the leather, cellulose fiber and box-toe waste; In this case, the function of the bichromate of soda and the carbonate of soda is to react with the tannin ardrestore to the leather .a'

brown shade. It. will be observed that,'since a large proportion I am able'to dispense with Montan wax as an ingredient.

l The sheeted'materiaLfonned on a paper machineafrom the pulp produced in the foregoing examples, is dried, andis then heated and ressed (as by the use of hot calender rolls sufliciently' to flux the contained thermoplastic compound and cause its coalesof box-toe waste is usedfmachine.

' to be precipitated, ad

made hard, dense and waterproof. The

sheet may now be skived, and. the cut surface presents the appearance of leather. Because of the. contained gums, resins, etc,

the cut edges are capable of receiving and re- 70 taining a. fine polish.

What I claim is p 1, A fiber board comprising cellulose fibers,

leather fibers, and

with the fibers in felted relation and the particles of thermoplastic compound distributed and precipitated throughout the board.

2. A fiber fibers, leather fibers, fibrous Waste containing a thermo-plastic compound, and thermoplastic compound having a relatively low viscosity when molten, with the fibers in felted relation and the particles -of.thermo plastic compounds distributed throughout the board.- I

3. A hard dense fiber board comprising cellulose fibers, leather fibers land fibrous Waste containing a thermo-plastic compound,

with the fibers in felted relation' and the thremo-plastic compound distributed throughout and coalesced within the board,

said board being compacted and presenting,

when cut, a surface capable of receiving a polish.

tfA process of producing fiber board, which comprises. comminuting fibrous waste containing a thermo-plastic compound, formdisintegrated fibrous waste containing a thermoplastic compound, 75

board comprising cellulose 80 ing such disintegrated wastetogether with and leather fibers into an and sheeting such pulp with lted relation and the thermoaqueous pulp, the fibers in f plastic compound distributed throughout the p l l fiber board,

sheet.

5. A process of, producing which comprises disintegrating box-toe waste containinga thermo-plastic compound, forming, such disintegrated waste together with cellulose fibers,'le ather fibersyand a crushed thermo-plastic compound of low viscosity when molten into an aqueous pulp, and sheeting such pulp on a papermachine.

6. A process of producingfiber board, which comprises waste containinga thermo -plastic compound, forming such disintegrated waste together with cellulose fibers and leather fibers, adding a precipitant to a'nd mixing it in said pulp,

7. A process of roducing fiber board, which comprises isinte ating box-toe waste containing a thermo-p forming such disintegrated with .cel'lulose' fibers, leatherv fibers, and a crushed thermo-plastiof compound of low? Viscosity when molten into an aqueous pulp, incorporating in the pul a material adapted astic compound,

waste together 125 disintegrating box-toe .andsheeting the pulpon a paper .1 7

ng, to the pulp a precipitant for the precipitation thereof, and sheeting the resulting pulp on a paper machine.

8. A process of producing fiber board, which comprises disintegrating box-toe waste containing a thermo-plastic compound, forming such disintegrated waste together with cellulose fibers and leather fibers into an aqueous pulp, incorporating in said pulp a material for reacting with tannin of the leather fiber and restoring the color of the leather, and sheeting the pulp on a paper machine.

9. A process of producing fiber board,

which comprises disintegrating box-toe waste containing a thermo-plastic compound, forming such disintegrated waste together with cellulose fibers, leather fibers, .and a. crushed thermo-plastic compound of low viscosity when molten into an aqueous pulp, incorporating sodium silicate in said pulp, incorporating alum in said pulp for precipitating a gelatinous precipitate, and sheeting said pulp in a paper machine.

In testimony whereof I'have aflixed my signature.

ALBERT L. CLAPP.