Патент USA US2411743код для вставки
Nov. 26, 1946.` y H. G. MORNÈR > 2,411,743 FLUID PRESSURE MOLDING APPARATUS Filed sept. 2o, 1944 ' ` - 2 sheets-sheet 2 ffffff «I lT/URNEY ' . Patented Nov. 26, 1946 1 UNITED ‘ STATI-:s PATENT. OFFICE Application September 20, 1944, Serial No. 554,921 2 Claims. (Cl. 144-281) 1 The invention relates to apparatus for molding articles and more particularly to new and useful means for molding plastic-bonded plywood or other plastic-bonded sheet material by fluid pres ’ contact with the material to be molded, it being most desirable to avoid air pockets and lack of contact throughout the surface. vThis operation has heretofore involved considerable difficulty in fitting the bag to the mold and material. The bag has necessarily required a large mouth or open Objects and advantagesof the invention will be ing to enable it to be drawn over the mold and set forth in part hereinafter and in part will be material, especially where the articles to be obvious herefrorn, or may be learned by practice molded constitute large objects such as the wing with the invention, the same being realized and or fuselage of an airplane. The matter of en 10 attained by means of the instrumentalities and casing or sheathing the mold and article in the combinations pointed out in the appended claims. bag has been a difficult and awkward operation The invention consists in the novel parts, con and the necessarily loose fit obtained by the use of structions, arrangements, combinations' and im a bag having an opening large enough to encase provements herein shown and described. such objects has led to looseness in the ultimate The accompanying drawings, referred tc herein flt and the use of an undesirably large amount of and constituting a part hereof, illustrate one em- I extra material. In order to put the bag about bodiment of the invention, and together with the the mold and article it has been necessary to drag, description, serve to explain the principles of the pull and stretch the bag along, under and over sure. invention, 20 the same. Also it is difficult to wrap the bag or Of the drawings: parts thereof about the mold and articles to in Fig. l is a transverse section of _a mold equipped sure complete coverage, ' ' with devices embodying the invention; ‘ Moreover, great difficulty has been encountered in effecting a complete closure and seal ofthe bag» Fig. 3 is a similar view of another modiflcation; about the mold and article in order to proceedl Fig, 4 is a fragmentary plan view of the mold 25 with the molding operation. The molding opera shown in Fig. l; tion entails application of fluid pressure and heat Figs. 5, 6 and 7 are enlarged cross-sectional de_ to the exterior of the bag while Vpermitting the in tails of a vform of fastening device used with the terior thereof to exhaust to atmosphere or a lower Fig. 2 is a similar view of a modified form; invention; and ' Fig. 8 is an enlarged fragmentary plan ,view showing the fastener in place. The invention is directed to providing new and improved means for closing the flexible casings pressure zone, all as more fully disclosed in said Vidal et al. patent, for example. _ Where the bag is not tightly closed, heat and moisture penetrate such closures and frequently impair or loosen the mold or the article being. molded or bonded. Sim or bags utilized in the molding of plastic-bonded ilarly, where a close and accurate fit between the plywood, veneer or other fabric or plicated mate 35 bag and the enclosed article is not obtained, the rial when same is molded into various shapes and heat and pressure sometimes cause the poorly articles by means of fluid pressure applied throughA fitted portion of the bag to stretch across de a flexible membrane which lies between the source pressed surfaces in the enclosed article and thus of fluid pressure and the article being molded. weaken or break the bag at such point, causing The invention is applicable, for example, to the 40 .destruction of the bag and of the articles there method of molding disclosed in the patent to E. L. within. Vidal et al., No. 2,276,004, dated March 10, 1942, Objects of the invention are to provide devices but it will be understood that the invention is not for improving the fit of bags or membranes in~ limited to the particular process and apparatus such molding operations; and to provide com-l disclosed in said patent, but may be applied gen 45 pletely fluid-tight closuresr4 thereof which can erally to molding operations and apparatus of the ¿ be quickly and eiliciently“ closed and opened type broadly referred to above. throughoutl the entire length‘or breadth of the In such molding operations it is common to lay These features of the invention permit ‘ mold. or place the veneers or other plies of material, in insertiôn and withdrawal of the articles ter-larded with thermo-plastic or thermo-setting 50 rapid being molded; avoid the necessity for overlapping resin, against the surface of the male or female and wrapping bags or layers thereof about such mold and then encase the mold and material to be articles and molds; permit the shaping of the molded within a flexible membrane such as a bag to the mold and Aarticle so that a c_lose and rubber bag. The bag ~is then preferably exhausted accurate fit is obtained automatically upon clo so as to bring the membrane thereof into intimate 55 E "animee ï sure. The invention also leads to great economy in the amount of rubber or other fabric yused for the bag membrane and also avoids breakage or . d » rial, which sheet is permanently and hermetically and application of heat and pressure and other bonded by plastic or other means to the plane surfaces || I. Thus it will be apparent that the closure members 3 and 4 may be drawn together by suitable slide fastening means so that the wise. entire blanket I|0 will be closed and sealed over rupture of such membranes through handling The invention broadly comprises the applica tion to such molding bags or membranes of a ñexible slide fastener or closure such as that shown and described, for example, in my Patent No. 2,355,816, dated August 15, 1944. Such clo sure, being made of rubber or other fiexible ma teriai, can be formed integrally with the edges ` of the bag or membrane it is desired to close and, and about the molds |00 and |03 and the envelop ing article or material |00 to be molded. The embodied means for effecting the slide fastening closure comprises the two major fiexible rubber bodies or strips 3 and d adapted to be operably engaged in interlocking longitudinal relationship. Each of- said strips il and d extends throughout the length of the opening to be closed, because of its flexible nature, the closure will 15 is made of relatively thick but pliable and yield conform lexactly to the shape to be taken by the bag or membrane against the mold and article within it. Because of the fact that such closure can be of indefinite length, the opening of the bag can be made throughout its length or breadth or both, thereby permitting same to be laid fully open for the easy insertion of the material to i be molded within the mold (female) or readily able rubber, preferably of about theconsistency - of automobile tire rubber or slightly softer. Each of said strips is therefore inherently iiexible throughout its length and- thus is adapted to conform to the-‘shape of the container or of the contents thereof. The strip 3 (Fig. 5) is formed as a solid rubber body having a flat base portion 5 which tapers to a relatively thin side edge por brought around the exterior of a male mold, as '_ tion or strip 0. The flat base 5 is adapted to be the case may be. ` ’ 25 seated on and vulcanized to the outer surface of It will be understood that the foregoing general the membrane or blanket ||0, while preferably description and the following- detailed description an overlapping sealing strip l is contiguously as well are exemplary and explanatory but are sealed to the outer surface of membrane IIO and not restrictive of the invention. overlies the thinner portion 6 and is vulcanized Referring now to the present preferred em 30 thereto so as to form a strong and fluid-proof and bodiment illustrated by way of example in the accompanying drawings, there is shown diagram flexible connection between the strip body 3 and the membrane I |0. Similarly body strip member matically in Fig. l a form of mold |00 for shaping l 4 is permanently sealed and fastened to the mem or molding part of the surface of an airfoil or brane ||4 by `similar parts as will -be clear from aircraft wing, for example. This mold may be 35 the drawings. _ similar in principle to those shown in Vidal Pat ent No. 2,276,004, British Patent 443,696v t0 Groves, and the like, and it is understood that intermeshed and separably interlocked through the generally rectangular base or> block |00_ hav ing the concave portion |02 forming the lower throughout the length of the member. The socket The strip members 3 and 4 are adapted to be out their length andtheir adjacent surfaces are the detailed construction of said mold and the suitably formed for this purpose. As will appear part to be molded thereon constitute no part of 40 from Figs. 5 and 6,. the strip member 3 is the pri- ‘ the present invention -and are here shown as mary female member of the closure pair,- its in suggestive and illustrative only of the principle "ner or meshing surface being formed with a of the present invention. Said mold còmprises groove or socket-like recessv I0 which extends surface and tail and nose curves of the Wing. A male mold block |03 may be seated within said outer mold |02 and upon said male mold there will be laid strips of veneer |04 which are suitably or groove I0 is formed by an upper node or ridge Il, the terminal edge of which is arcuate. A lower node or ridge underlies the socket |0 and curves outwardly and upwardly from the interior thereof to provide an upper terminal edge I3. coated or impregnated with thermo-responsive 50 Said edge I3 and the opposite and adjacent ter plastic material which acts under he'at and pres minal edge I4 of the node || are spaced closer to sure to bond and integrate and mold together each other than the maximum cross-sectional di - the various layers of veneer or other fabric ma ameter of the socket I0 so that said socket has a terial being so molded. , mouth or entrance smaller in cross-section than In accordance with the invention, the molds its interior section. The upper surface of the |00 and |03 and the article |04 to be molded are node I I is reversely curved at I5 to form 'a rounded all encased within a fluid-tight membrane or top for the member 3 which continues in a sub ' casing which, as shown, comprises the overlyingstantially uniform arc around the surface there rubber blanket H0, the edges of which lie upon ofrto form a re-entrant groove I6 along the back the plane border surfaces ||I of the mold block 60 edge of the member 3 and at about the same level |00. The peripheral edge of said blanket ||0 is as the lower portion of the rsocket I0. 'I'he ta provided with` a beaded closure member 3 formed ~ pered upper surface of the base member 5 extends of rubber or other ñexible material, which mem into the groove i6 as shown. The lower surface ber is preferably' shaped ~ and constructed as |'| of the lower node I2 curves downwardly and shown and described in detail in my Patent No. rearwardly to terminate at a slight shoulder I8 2,355,816. Said member preferably extends along formed in the fiat base of the portion 5. the entire periphery of the blanket ||0 and when The strip I constitutes the primary male mem- ' said blanket is laid in the mold-covering >position ber of the closure couple and its engaging or front shown in Fig. 1, said closure member 3 is adapted face is provided throughout its length with pro to be engaged with the mating closure member 4 truding node 20 which is substantially circular in which is fastened to the plane border surface | | | cross-section throughout about three-fourths of of the/block |00. As shown, said mating closure its cross-sectional circumference and is shaped member d is fastened to said border surface I|| and positioned so as to flt very tightly into the of the block, being formed as an integral border socket-portion I0 of the member 3. The rear or ing part >of a sheet llt ofrubber or other mate neck portion 2|` of the node 20 is narrower than 2,41 1,748 . the maior-diameter of the .node and thus is ` adapted to conform to and nt tightly in the space between the edges I3 and I4 of the member 3. The face of member 4 above the node 20 is re 6 construction therefore greatly facilitates the /slld i118 engagement and disengagement of the strip members, while at the same time the sealing actions of the flexible lip members 23 and 21 provides a unique sealing function in combina tion with the main interlock as above described. entrantly grooved to form an> arcuate socket 22 which is adapted to receive and intimately en The invention provides means for joining and gage the node portion Il of the member 3. The , closing togetherthe strips 3 and 4 of the closure 4 above the socket 22 is ' portion of the member of slide action and one important feature of the tapered to form an overlapping and relatively invention is the construction of slide means which 10 thin lip portion 23 which overlies the upper will reduce to a minimum the friction and re grooved surface I5 of the member 3 to a sub sistance to such closures under all conditions- of 1 stantial extent. It will be noted that the termi nal edge of the lip member 23 is in substantially the same vertical plane as the terminal edge of use of the device, while at thesame time pro viding the maximum of tightness and compres the node member 20. ’I'he upper surface' of the llip portion 23 is rearwardly and downwardly ~so as `to provide and maintain an exceedingly curved in an arc 2_4 roughly corresponding-in ‘ sion of the engaging parts of the closure strips tight, and therefore effective, sealing closure. For this purpose a rolling and compressing action shape to that of the surface I5 of member 3 and is preferably employed. As embodied the slide being re-entrantly grooved at 25 along the rear comprises a frame having a flat, generally rec 20 edge of the member 4, which groove merges with tangular metal base piece 30 which overlies and the rising surface of the tapered base 5 so as to - is spaced a short distance from the top of the form a groove identical in shape with and atl the same level as the groove i3 of the member 3 but .facing in the opposite direction, as will be clear from the drawings. ’ The lower portion of the node 20 merges with a reversely curved grooved portionl 23, the cross sectional outline of which corresponds intimately `with the node I2 of the member 3.- Below ‘the groove 23 the member 4 curves` inwardly and downwardly to form the relatively thin and flex ible lip portion 21, the base of which is cc-exten sive with the fiat base of portion 5. The inner ' outermost portion ofthe lip 23 of the strip mem ber 4, said plate 30 thus lying parallel to the base 5 and the face of the membranes I and 2. Each of the four corners of the plate 33 is aper tureq to receive a vertically-disposed pin 3I hav ing an enlarged head 32 the base of which lies flush against the top of the plate. Said pin ex tends downwardly from the plate a sufficient dis tanceto serve as an axle or -journal- for a roller 33 which is rotatable thereon. Said roller has .an upper cylindrical portion, the top of which . underlies the bottom surface of the plate 33 and therebelow the surface of’the roller is curved as shown in Fig.v 6, said curvature being such. that f abut against the'shoulder I3 of member 3 when the roller is circular in cross-section throughout the strips are in their interlocked engagement,v but of diminishing radius nearly to its bottom as wm be clear from Figs.> 6 and '1. . portion where it again flares to terminate in a When the strips 3 and 4 are inter-engaged as ' circular hub 35. Said hub has a roundedl edge described and shown, the central node portion 40 ofl a thickness such that it fits intimately into 20 is tightly interlocked within the receiving the groove 25 of the strip member 4 (or groove socket 'I0 of the member 3. That is, it is neces I'S of strip member 3 as the case may be) while sary to force’ the member 20 into the vsocket I0 the rear curved portions 24 and I5 of the strip between the constricting jaws I3 and I4 of the ~ members 4 and 3 respectively fit generally into latter, the resiliency ofthe rubber permitting this 45 the curved surfaces 34 of the rollers. It will be action. At thev same time the lower node I2 and understood that each of the rollers 33 at the the upper node il of the member 3 are recessed four corners of the plate 30 is identical in con in the sockets 26 and 22 respectively of the mem struction and that each of them is rotatable ber 4 so that a firm union and interlocking closure on its respective axle pin 3i as shown. VThe lower 60 isaiforded by these parts. In addition, however, ends of said axle pins 3l are enlarged at 35 to be the overlapping relatively thin and pliable lip 23 seated in conforming recesses at the base 35 of embraces and overlies the entire joinder of thethe rollers and thereby act to rotatably support strips. This lip member therefore forms an effec said rollers as shown. ‘ 'tive seal to the entire closure or joint and. be As will be clear from the drawings, movement ~ cause of its thin-ness and relative pliability, it is 55 of the slide 3_0 lengthwise of the strips 3 and 4 adapted to be forced tightly against the upper will cause the rollers to rotate due to the fric surface I5 of member 3 when the closure is sub tional engagement thereof with the outer or rear jeoted to external fluid force during the molding edges I5 and 24 of the strips 3 and 4 respectively. operation. That is, the fluid pressure exerted 'I'he rollers thus exert a cammingfan‘d squeezing 60 against fthe surfaces of the container or blanket actionl upony the strips to force them toward tends to compress and thereby tighten the closure each other and into interlocking engagement as of the entire joint and especially to' force the overlying lip 23 tightly over and against the ' shown. The bottom hubs 35 of therollers travel surface I5 and thereby effectively seal the entire - in the grooves I6 and 25 and thereby exert power joint. _In a similar manner the underlying, rela 65 ful clamping and compressing action upon the edge of lip 21 extends so as to underlie the curved surface I1 of the portion I2 of member 2 and tively thin tapered lip 21 performs alike function for the lower portion of the closure as will be ob vious from the foregoing taken in connection with strips so as to- cause the interlocking nodes 20 and I2 and their respective socket portions to be forced4 quickly and ñrmiy together. Due to `the seating of the hubs 35 in said grooves, the drawings. ` ~ , It will be noted‘that the engagement of node 70 slide is at all times intimately engaged with the ‘ strips 3 and 4 wherever it may be located along II in the socket 22 and node i2 in socket 25 them and‘merely by pulling it lengthwise along are relatively easily separated by transverse move said strips it forces the unengaged strips to mentl as there» is little or no interlocking action gether as stated and shown. It will be recog at these surfaces, the only true interlock being the between the socket I0 and the node 20. This 75 nized that by the'utilization of rolling friction, a` 2,411,743 relatively great compressive force can be >exerted upon the strips while at the same time assuring easy operation of the slide along the strips under - any and all conditions. Moreover the provision , chains 60 and 6| are provided for this purpose. Said chains preferably comprise links separated by small beads 62.,Ä Each arm of the spacer mem bei' 50 is apertured by a slot 53 ~the outer portion of four such rollers, as shown. tendsV tomain 5 of which is narrow and which is enlarged termi tain the movement of the slide rectilinear and nally to permit passage of the link portion 60 of even as it travels along the strips. thereby pre the chain but is too small to admit passage of the venting an‘ypossibilitypf jamming or tilting or ' bead members 62 thereof. Thus any pull on the twisting vof the slide out of its desired trackway, chains in either ldirection will. cause the follower while the -multiple rollers distribute the rolling 10 members 50 to slide along the strips. The chains friction and thereby reduce the force required. at one end are fixed to the slide plate 30, the lower It will furtherbe understood that movement ends 65 thereof being downwardly flanged at 66 v,of the slide in one direction will effect closure to provide means for attachment of ythe endsv and inter-engagement of the strips 3 and 4. of said chains. The flanged portions 66 areap ~However, a reverse movement of the slide will 15 ertured at 61 in form similar to the apertures 53, not automatically separate the strips,_ but will there to receive the end link and bead of the merely make their separation possible by hand. - chain as shown. Thus when the slide is pulled Thus the closure of a bag. for instance, will re-` upwardly, it pulls the chains 60 and 6| along with main water-tight until it is actually opened. it and in so doing causes the followers 50 to be Means for facilitating sliding of the slide on the 20 -pulled along the strips to take up their spaced vstrips is provided and same is constructed so as positions along the taut chains. Preferably, the to further reduce> any possibility of the slide tov followers are provided in sets of pairs spaced by tilt or assume an undesired angular position on a single bead 62 thus providing a distribution of the strips in either direction of movement there gripping action at each pair of said followers. along. As embodied a slide pull comprising a pair 25 The bottom ends of the strips 3 and 4 are pref- ' of looped cords 40 and 4| is provided, the ends of -erably maintainedl permanently interlocked to said cords being passed through a button or aper gether and for this purpose an arcuate or U tured handle member 42 and knotted at 43. The shaped band 10 is tightly gripped about the ele opposite ends of said cords are passed through vated portions of the strips as shown in Fig. 8. longitudinal slides 45 and 46 respectively formed 30 The terminal ends are tightly embedded into the in the slide plate 30. Thus when it is desired grooves |6 and 25 respectively of the two strips so to pull -the slide upwardly to close the strips to that said band 10 is tightly fixed and stationary gether, the cord loops will slide to the upper ends near the lower ends of said strips. The bottom of the slots 45 and 46 and the pull will be exerted ends of the chains 60 and 6| are fixed to said band there substantially parallel to the plane of the 10 by ears ‘I5 which extend toward the sides of slide 30 and the direction of desired movement. said band and are provided with appropriate - Conversely when it is desired to pull the slide openings 16 to receive and hold the ends of said downwardly in the opposite direction, the looped chains as shown. cords will slip to the bottom of the slots 45 and ~ Thus in the embodiment described above, it 46 and thus the pull will be exerted at the lower will be seen that complete and rapid closure of end of the slide and therefore more closely par the molds and article to be molded may be ef allel to the desired plane of movement. In other fected simply by laying the properly shaped ' words, no tilting action is imparted to the. slide blanket ||0 thereover and sealing same to the or carriage in either direction of movement mold block |00 by means of the slide fastener 4 thereof as would be the case if the point of ap .plication of the pulling force were ñxed at the center or at either end of the slide. Hence bind ing or wedging of the slide on the strips is mate rially reduced by this feature of the invention. The invention provides additional means for maintaining compact closure and security there Aof throughout the length of the strips 3 and 4 over which the slide 30 has been moved in the closing direction., For this purpose a plurality of slide following members 50 are provided, said members being adapted to be drawn after the slide 30 and to maintain the compactness of closure which has been effected thereby. Said following members 50 are preferably substantially U-_shaped pieces of operation 4described above. .Consequently the blanket. ||0 may be accordingly shaped to oo_n form to the mold and article without any slack or wrinkles and without'requiring any close set ting or manipulation during or after the appli cation thereof. At the same time the closure ef fected by the above-described means is fluid-tight even under the pressures and temperatures yused for the molding operation so that no danger of leakage or rupture is involved. Referring to the modification of the invention shown in Fig. 2, the mold block |00, the molds |02 and |03 and the article |04 to be molded are substantially the same as those shown in Fig. 1. However, with this form of the invention the flat metal, the interior curvature of which con 60 closure members 3 and 4 are located along an forms substantially to the exterior outline of the intermediate line of the overlying blanket which curved portions I5 and 24 of the strips 3 and 4 comprises two separate pieces |20 and |2|. The when the latter are inter-engaged. Inwardly dis edges of the piece |20 are sealed to the upper posed tongues 5| and 52 are provided near the border surface | || of the mold block as by an 'ends of the arms of the member 50 and extend 65 overlying metal or other hermetic sealing mem ing into and travelling along the grooves I6 and ' ber |25, while the similar edges of the piece |2| 25 respectively, there acting to maintain the pres are similarly> sealed by means |26. The closure sure and compacting force originally exerted by members 3 and 4 may and preferably do extend the hubs 35 of the rollers 33 of the slide. Means are provided for drawing the followers 50 after the slide and for maintaining same in suitable spaced positions along the closed parts of the strips 3 and 4. As embodied each of the followers A50 is attached to ñexible cords or chains along either side of the strips ,and as shown throughout the length of the mold and blanket ' members |20 and |2| so that same may be laid back to either side of the mold for the insertion » of the mold |03 and its attached article |04. When same have been inserted, the fiaps or pieces |20' and |2| are laid over the top thereof and the closures 3 and 4 are drawn together by means 2,411,743 9 A . 10 The invention in its broader aspects is not lim ited to the specinc mechanisms 'shown and de will-be understood that the-iiexibility oi.' the fas scribed but departures may be made therefrom tener or closure means 3 or 4 permits a. continuity within the scope or the accompanying claims of the flexible and pliable nature of the members |20 and l2l throughout their length so that same fà without departing from the principles oi' thé in vention and without sacrificing its chief advan - will conform even along the edges of the closure tages. . to the surfaces to‘ be molded therewithin.Í Thus What I claim is: , a completely tight and accurate iltting> oLthe 1. In ñuid pressure molding apparatus in com membranes is assured throughout the length of of the slide fastener as previously described. It " the bag or membrane means, while a completely 10 binatlon,l a mold curved in at least two directions and adapted to have material to be molded in fluid-tight closure is effected in a position most Contact therewith,\ a ilexible `huid-impervious ’envenient for insertion and removalof the mold membrane positioned to cover said mold and ma or articles to be molded. The work need not be terial, the membrane being shaped and sized to' dragged along in contact with the blanket or conform closely to said mold and material, means membrane during the closing and ñtting opera for subjecting the face of the membrane remote tions nor will the blanket or membrane be from the mold and material to fluid pressure and dragged or brought in contact with the fioor or means for venting the opposite face thereof to other surfaces while putting the assembly in the . a lower pressure, and an opening in said mem- . autoclave for heating and application of pressure. The minimum surface and quantity of material 20 brane, the edges of said opening being formed as ilexible mating strips of yieldable material, and for the ñuid-tight membrane’is providedby this a slide member for joining said strips in a fluid _and the first form of _the invention described tight closure, said closure being substantially co while a minimum of handling thereof isl entailed extensive with one of the major axial dimensions in both cases. . Referring to the form of the invention shown 25 of the mold. 2. In iiuid pressure molding apparatus in com in Fig. 3, same is there show-n as applied to a bag like membrane which is wrapped around or com pletely envelopes the mold and article to be mold-4 bination, a curved mold adapted to have mate rial to be molded in contact therewith, a flexible fluid-impervious bag for enclosing said mold and ed, as in Fig. 2 of said Vidal patent. for example. In this form the male mold i3lllis positioned'with 30 material, said bag being shaped and sized to con form closely to the mold and material there vthe materials I3! to be molded thereabout and within, means for subjecting the face o1’ the bag this assembly is surrounded by a bag or mem remote from the mold and material to fluid pres brane comprising a continuous blanket |35 which, sure, means for venting the opposite face thereof as shown, completely envelopes ,the mold and article. The closure of said bag or envelope is 35 to a lower pressure, and an opening in said bag substantially coextensive with» one of the major eñected’by the closure members 3 and 4 provided axialjdimensions of the mold, the edges of said throughout the length of the opening or mouth of opening being formed as flexible mating strips.,of said bag, said opening and closure members pref yieldable material joinable together in a fluid erably _extending throughout the length of said tight closure, said closure ~being continuous 40 bag. Here again the minimum amount of blanket throughout the length of said opening and flexi or membrane material is required to completely bly movable with the walls of the bag in respect envelope the mold and article and same may be to the mold. drawn tightly into conformity therewith by the HANS G. MORNER. act of closing the bag as already described.