Патент USA US2408628код для вставки
Oct. 1, 1946. ' ‘ I LB. GREEN _ ' ‘APPARATUS FOR HXTI'RUDING Filed on. n, 1943 2,403,527, - ,1 INVENmR. LEE’ 5 E255” F765 , Arm/#576 Patented Oct. 1, 1946 2,408,627 . . UNITED, STATES- PATENT OFFICE v arranarozxfzixmunmc 3 Claims. I (01. 18-12) ’ 1 ~ 2 This invention relates to the extrusion of non metallic plastic material, and as one of its ob jects, aims to provide a novel means by which In extruding non-metallic plastic material to form relatively thinv or thin-walled products con‘ siderable pressure must be applied to the mate such plastic material can be extruded in a more rial to obtain a satisfactory ?ow through the ex rapid'and satisfactory manner than previously. 5 truding die or ori?ce. The reason for this is that Another object of my invention is to provide - for the extrusion of such thin products the die has a corresponding relatively narrow ori?ce and the surface area of the product in relation to its a novel means by which the output of existing extruding apparatus can be greatly increased at very little cost. a cross-sectional area is great and results in a rela . My invention further provides a novel extrud 10 tively increased amount of friction or adhesion between the die and the material being extruded. ing means for plastic material, involving the use of relatively rapid vibrations for accelerating the - The heavy pressure required in the cylinderis' flow of the material through a die or ori?ce. Still another object of my invention is to pro vide a novel means involving the use of ?ow I needed to overcome such friction and adhesion. a My invention is applicable to various kinds of 15 extruding apparatus and extruded products but accelerating vibrations and which is especially is especially valuable in the extrusion of the above mentioned thin or thin-walled products, because it greatly facilitates the ?ow of the plas tic material through the extruding die. In Figs. ' rate for a given pressure applied to the plastic material. . 20 1 and 2 I have accordingly shown the extruded product la in the form of a relatively thin strip Other objects and advantages will become ap of plastic or thermoplastic material and have parent as the detailed description proceeds. valuable for extruding thin articles from‘ non metallic plastic material at a greatly increased In the accompanying sheetof drawings shown the die l3 as having an ori?ce or delivery opening 7 I! of a corresponding shape, that is to Fig. 1 is an end view of extruding apparatus embodying my invention. 25 say, in the form of a relatively narrow slot. The ' Fig. 2 is a partial longitudinal sectional view die l3 also has a converging passage 20 therein, which forms a relatively smooth continuation of of such apparatus taken on line 2-2 of Fig. 1. the reduced end Ha of the cylinder II and con Fig. 3 is an end view of another form of my novel extruding apparatus. ' nects the latter with the ori?ce I9. Fig. 4 and 5 are plan views, of a diagrammatic 30 The above mentioned vibratory feature con- ‘ nature, showing comparative results obtained sists in imparting relatively rapid vibrations to from extruding apparatus with and without the use of my vibratory feature. the extruding apparatus l0 and preferably to the extruding die l3 thereof which is also some times referred to as the die head. These vibra tions can be imparted through the extruding ap Proceeding with a more detailed description of my invention reference will now be had to Figs. 1 and 2 in which I show a conventional form of paratus or die by any appropriate vibratory extruding apparatus l0 embodying my novel vi bratory feature. The apparatus Ill comprises a cylinder l I adapted to contain non-metallic plas means or device such as the vibratory device 2| shown in this instance. The vibrator 2| may be an electric or electro-magnetic vibrator to which tic or thermoplastic material l2 and a die head 40 operating current may be supplied through the conductor cord 22. The vibratory device may be produce a desired product. A plunger I 4 oper connected with the die It in any suitable man ' 13 for extruding or discharging such material to able in the cylinder II subjects such material to pressure forcing the same through the reduced ~ end Ha of the cylinder and through the extrud ing die 13. The cylinder H is contained in a ner,_'for example it may be mounted directly on the die at a suitable point thereof as shown in This vibratory device may em body a means by which the rate and amplitude of 45 Figs. 1 and 2. the vibrations may be adjusted and which adjust body is which is suitably supported and forms .3, part of the extruding apparatus. A heating coil. 7 ing means is controlled or actuated, from the ex ‘ terior of the device by the knob 23. I ‘ I 6 is disposed around the cylinder l I and sup The vibrations imparted to the extruding ap plies heat to the material‘ l3. Thermal insula 50 paratus are preferably small, relative rapid blows tion I‘! retards loss of heat from the cylinder. or jars and result in a relatively great increase The material ~l2 canbe any non-metallic plas tic material which is suitable for extrusion pur in the rate of ?ow of the plastic material from poses including thermoplastic materials such as the ori?ce I 9 for a given pressure applied to the the material known as “tenite." - as material in the cylinder II. In producing this 2,408,827 .4 light blows or jars it should be understood that pressure and temperature values. Fig. 4 shows a vibrator 35 mounted on the die 38 of the appara tus and Fig. 5 shows the die 35 without having my vibratory feature applied thereto. Fig. 4 shows a relatively greater length of extruded product 31 being produced in a given time inter val than in Fig. 5. These comparative views il lustrate the accelerated ?ow of the plastic mate the invention contemplates a wide variation in rial which is obtained through the use of the vi— 1 accelerated ?ow the vibrations apparently serve the purpose of preventing the plastic material from adhering to the surfaces of the die and also in decreasing the friction which would otherwise retard the ?ow of material from the ori?ce. While I have mentioned the vibrations as being relatively rapid and as being preferably small or the rate, amplitude and force of- the vibrations, 10 bratory feature of my invention, although it is not intended that the lengths of extruded prod because these factors can obviously be varied to uct in Figs. 4 and 5 be scaled or otherwise com suit the requirements of the particular material pared by measurements of my patent drawing. being extruded, the characteristics of the die or From the. foregoing description and the ac ' ori?ce, and the shape or form of the product 15 companying drawing it will now be readily under being produced. stood that I have provided a novel means by which non-metallic plastic or thermoplastic ma terial can be extruded at a relatively accelerated rate and involving the use of vibrations imparted calized in or con?ned to the die or die head. To this end, the die I3 is connected with the mem 20 to the extruding apparatus for reducing the fric tion and adhesion in the extruding die or ori?ce. ber I5 so as to have only a relatively small area It will also be seen that my novel method and of contact therewith as represented by the pro vibratory feature can be applied to extrusion ap jection 24. Other portions of the die l3 are iso paratus during the initial construction thereof or lated from the member 15 by the intervening space 25. 25 can be applied to existing extrusion apparatus for greatly increasing the output thereof at relatively In Fig. 3 I show another form of my novel ex low cost. truding apparatus in which my vibratory feature While I have illustrated and described by ex is used in conjunction with an extrusion die 21 truding apparatus in considerable detail it will be having an ori?ce 28 of a shape to produce an ex truded product in the form of the thin-walled 30 understood, of course, that I do not wish to be correspondingly limited but regard my invention tube 29. In this modi?ed form of my extrusion as including all changes and modi?cations com apparatus a plurality of vibrators 30 are mounted ing within the scope of the appended claims. on the die 21 so as to be located on oppositesides Having thus described my invention, I claim: of, or in spaced relation around, the ori?ce 28. 1. In extruding apparatus, a die including a die The vibrators 30 are, in this instance, represented 35 head having an extrusion opening, means for dis as being ?uid actuated vibrators to which com charging heated non-metallic thermoplastic ma pressed air or other suitable motive ?uid is sup terial from said extrusion opening; and a vibra- , plied by the pipe 3!. The operation of the vibra tion generating device attached to said die head. tors 30 may be controlled by the valve 32 located 2. In extruding apparatus, a die including a die 40 in such pipe. ' i head having a relatively narrow ori?ce, means for It will be understood, of course, that in accord discharging non-metallic heated thermoplastic ance with my invention the vibrations are im parted to the die or extruding apparatus simul material through said ori?ce by applying a given taneously with the carrying out of the extrusion pressure to said material, and means for accel erating the ?ow produced through said ori?ce operation, that is, simultaneous with the applica tion of pressure to the plastic material I! and by said given pressure comprising a vibrator at also the application of heat when the material is tached to said die head. 3. In extruding apparatus, means for heating a thermoplastic material. Likewise it will be un derstood that a plurality of vibrators could be non-metallic thermoplastic material, means for applied to the die I3 as is suggested in Fig. 3 and, subjecting the heated material to pressure, a die head having an extrusion opening for the delivery on the other hand, a single vibrator could be used with the die 2'! of Fig. 3 as in the arrangement of of said material therefrom in response to said As shown in Fig. 2 the vibrations are prefer ably applied to the extruding die l3 in a manner such that the vibrations will be more or less 10 Fig. 1. ’ ' ‘pressure, said die’head being connected with the In Figs. 4 and 5, I have represented diagram matically and in a visual manner the compara tive results obtained from conventional extrud ing apparatus 34 when used‘ with and without my, vibratory feature. These views represent the same extruding apparatus using the same extrud ing die, thermoplastic material, and the same 60 apparatus so that the major portion of said head is isolated from direct contact with said heating and pressure means, and a vibrating means at tached to said die head and operable to impart vibrations to the latter for accelerating the flow of material through said extrusion opening. 7 ‘ LEE B. GREEN.