US1463575A

US1463575A - Mold and process for forming articles from pulp or other plastic material

Info

Publication number: US1463575A
Application number: US137541A
Authority: US
Inventors: Cooper Simon
Original assignee: VACUUM PULP PRODUCTS CORP
Current assignee: VACUUM PULP PRODUCTS Corp
Priority date: 1917-08-22
Filing date: 1917-08-22
Publication date: 1923-07-31
Anticipated expiration: 1940-07-31

Description

July 31, 192 3.

' S. COOPER MOLD AND PROCESS FOR FORMING ARTICLES FROM PULP OR OTHER PLASTIC MATERIAL Original Filed Aug. 22, 1917 QM/WWW 4-3 2 E oertain portions of the the reason July In, teas htthttt airs stares PATENT err,

SIMON fiOOPEE, 0F BROOKLYN, NEW YORK,

ASSIGNOR T0 VACUUM PULP PRODUCTS COBEORATION, OE NEW YORK, N. Y., A CORPORATION OF VIRGIN IA.

. s I MOLD AND PROCESS FOR, FORMING: ARTICLES FROM PULP OR OTHER PLASTIG MATERIAL.

' a lication filed August 22, 1912, serial no. w en.

- specification.

My present invention relates particularly to t e manufacture of hollow containers suchas milk bottles and the like and aims primarily to enable the production of such articles in the requisite strength and durability from material of a pulp-like character. I

' A further and more specific object is to strengthen the bottom portions of such eontainers so that they will be fully capable oi withstanding the handling which such articles are ordinaril subjected to.

in the accomp-ishment of these objects ll first preferably form a pulp wall or de osit by forcing the pulp material into a hfilow porous mold of the desired shape while said mold is supported in one position and then reduce a re-deposit or strengthening oi pulp wall by turning mold into-a diderent position and furthor forcing material into the mold in this new position, either by actually forcing ad ditional material into the mold or byv apply ing additional ressure to that already within the mold. sually the mold is first supported in'an "inverted position and then turned right side up forthe purpose of reinforming that part of the deposit which is to form the bottom of the completed article.

l have illustmted more orless diagram.- matically in the accompanying drawing one them of a paratus for carrying out the invention, w erein Fi ure 1 is a front view oil such apparatus, s owing in dotted lines the first and final conditions of the suction chemher'with the mold in inverted position, and Figure 2 is an enlarged sectional view of the SHGlTIOE" chamber as 111 the second or intermediate step with the mold in upright 1 v 7 like that shown in dotted lines in F gure 1,

le the-interior of the mold is in com- Renewed December 29, was.

munication with a supply of pulp. Accordingly the mold is inclosed withln a suction chamber 3, connected by a pipe line 4 with a suction creatin pum 5. A so-called vacuum tank 1s usual y interposed in the suction linev to eliminate pulsations of the pump and provide for an even draw on the vacuum or suction chamber 3, and a separator 6 may also be placed in this line to, prevent pulp passing back to the tank or to the amp. T a mold illustrated is for forming containers of the wide mouthed milk bottle variety and is shown made u of a correspondingly shaped 'gauze wal 7, and supported by ribbing 8, and a bottom 9, the to whole being formedsuitably in sections to enable the removal of the completed article from within the mold. A hollow column or tube 10, serves as the support for the mold within the suction chamber and also as a. part of the means for'supplying' the. pulp thereto,'the mold being for the urpose detachably secured with its mou over the open end of said supply tube. The balance of the pulp supply conduit is made up in the illustration of a flexible tube 11 adapted to dip into the pulp reservoir 12.

A flexihle'connection 13 is also shown in.- terposed in the suction conduit 4, these two flexible connections enabling reversal of the suction chamber without breaking the connections thereto.

A main control valve 14% and a more finely regulatable valve 15 by-passed around said main control valve, are shown provided in the suction line and a cut-ofi' valve to ma also be located in said line. Drain valves 1% may be provided at one or both ends of the suction chamber and a relief valve 18 is Y the pulp being admitted into the mol eitheii- I k I gradua y, as by the control of valve 15," which may be a finely adjustable needle valve, or more suddenly, through the control of main-control valve 14, the drain valves .lldtl,

container walls,

. posited pulp,

' thatsuch articles may may then-be removed from 17 and relief valve 18 being closed during such time. As the pulp rises in the mold a facing de osit is produced on the inner porous wa ls of the mold. Approximately atthe time that the mold becomes filled and the facing deposit is completed covering the entire interior of the mold, the suction chamher is reversed, end for end, and the mold thereby turned right side up, preferably without interrupting the suction. sec ondary deposit is thereby added to the first, without lamination, this second deposit being heaviest at-the bottom portion of the due to the static head of the liquid column in the mold. By regulating the degree of suction and controlling the reversing movement of the mold difierent eiiects may be obtained and the walls may- .be made heavier in certain parts than in others, or walls of uniform strength may be produced. The results may be further varied by closing off the suction, before, durin or after the reversing movement.

fitter a sufficient secondary deposit is obtained the mold is freed of surplus pulp,

usually by turning it back into the inverted first position and breaking the suction by opening relief 18.- This gradually establishes an equilibrium of pressure on the top and bottom of the. pulp column, as the incoming air slowly passes through the de-' allowing the excess to drain slowly back into the reservoir. The admission of this relief air through funnel 20 directly beneath the bottom forming wall of the pulp deposit also provides an air cushion temporarily supporting this, the

then uppermost part of the pulp deposit preventing the same from collapsing as the support afiorded by the pulp column is withdrawn. Then, after draining the suction chamber by way of valve 17, closing relief valve 18 and disconnecting pulp supply pipe 11 from the pulp reservoir, suction is again applied to remove free moisture'and to further compact and felt the deposited pulp. The molded product the moldv for further treatment or simply be kept in the mold for subsequent treatment. The suction chamber is preferably constituted so that it ma be readily opened for the removal of t e mold, as by making it in the form of a bell, as'indicated,-with jaw ortions 21, clampingly engaged with. the ase part 22 by a slight rotary movement, after having been passed through notches .23 in the edge of such base.

lit will be apparent from the foregoing thatthe invention is suited to the production of articles of any desired shape and e given the requisite j strength to meet their particular uses.

I claim:

1. The process of forming articles itrpm suction. to the exterior of a hollow with a body 'pulp material which comprises applyin e. I teasers pulp material which comprises forcing the material into the mouth of a hollow openended, orous mold while the mold is in an inverte position and then further forcing material into the mold with the mold positioned right side up;

2. The'process of ,iiorming articles from pulp material which comprises forcing the material into a hollow porous mold while said mold is disposed in one set osition and then further forcing material into the mold while the same is disposed in a re-. verse set position.

3. The process of forming articles from pulp material which comprises filling a hollow porous mold with the material while said mold is disposed in one set position and then turning the moldto reverse the same to another set position and further forcing material into the mold.

4:- The process of forming articles from pulp material which comprises applying mold whose interior is in communlcation of pulp material while the mold is in one set positionthen reversing the set position of said mold and again applying suction to the exterior of the same, to further force material into the mold.

5. The process of forming articles from pulp material which comprises applying suction to the exterior'of a hollow open= ended porous mold whose open end is in communication terial while said mold iis disposed in an inverted position and reversing the position of said mold and applying suction to the exterior of the same while in said reversed position.

.6. The process of forming articles from pulp material which comprises applying suction to the exterior of a hollow openended porous mold whose open end is in communication with a body of pulp material while said mold is disposed in an inverted position, relieving the suction thereon, reversing the 1position of said mold, and again applying t e suction while the mold is in such reversed position.

7. The process of forming articles from suetion to the exterior-of an open-ende hollow orous mold whose open end is in communication with a body of the material while said mold is supported in an inverted posiiii) with a body of Pulp i 0 porous tion, and thereby producing a deposit on while the interior is in communication with material, return'ingsa1djmold to the first inverted position) and then releasing the suction and freeing. the mold of mate ial idea cess of the deposit made onthe w'al s thereof. 8. The process of forming articles from pulp material which comprises applying suction to the exterior of an open-ended hollow porous mold whose open end is in communication with a body of the material, while said mold is supported in an inverted position and thereby roducing a de osit on the inner porous wa s of the mol reversing the position of said mold, end for end, an applying suction to the exterior thereof, returning said mold to the first inverted position and then releasing the suction and freeing the mold of material in excess of the deposit made on the walls thereof.

9. The process of forming articles from pulp material which comprises applying sue tion to the exterior of an open-ended hollow porous mold whose open end is in communication with a body of the material while said mold is supported in an inverted position, and thereby producing a deposit on the inner porous walls of the mold, reversing the position of said mold end for end, returning said mold to the first inverted position and then releasing the suction and freeing the mold of material -inexcess of the deposit made on the walls thereof.

10. The process of forming articles from pulp material which comprises applying suction to the exterior of an open-ended hollow porous mold Whose open end is in communication with a body of the material while said mold is supported in an inverted posi-' tion, and thereb producing a deposit on the inner porous Wa ls of the mold, reversing the position of said mold end for end, and a plying suction'to the exterior thereof whi e the interior is in communication with material, returning said mold to the first inverted position and then releasing the suction and freeing the mold of material 1n excess of the deposit made on the walls thereof and then again applying suction after the mold has been disconnected from the supply of material.

- 11. In the forming of pulp articles, suction means, a movable suction chamber flexibly connected therewith, a pulp, reservoir, a porous mold in the suction chamber flexibly connected with the, pulp reservoir, and a pulp separator interposed between the suction chamber and the suction means.

In testimony whereof I aflix my signature.

SIMON oooPaR;