DE2444700A1 - Blow moulded container with flared skirt - formed by a double thickness folded portion of container wall - Google Patents

Abstract

Blow moulded plastics container has a finish and integral side walls and arcuate bottom, with an outwardly flaring peripheral skirt portion integral with the bottom and side walls, the skirt being formes as a double walled portion, the outer walls being integral with the side wall and the inner wll integral with the bottom. The skirt walls are joined integrally at their lower extremity and are heat sealed to one another adjacent a support edge for the container. The side wall, bottom, and skirt walls, all have the same thermal history. The skirt may be formed by deforming a container preform in a mould with a movable portion which is moved to form the double walled skirt.

Description

Blown plastic container and its manufacture manufacturing process The present application relates to U.S. Application No. 103,624.

The invention relates to a blown plastic container and its manufacturing process.

In the case of containers for storing liquids under pressure, e.g. carbonated beverages such as beer and the like is a so-called "Pressure floor" desired. Such 'bottoms are generally convex in shape on, but can also be "arched" or concave. With these soil 1 men is generally the hard transition at the "foot" of a conventional flat-bottomed Beverage bottle avoided, so that a greater bottom strength of the container results.

This strength advantage is achieved in several ways.

First, the design itself is simply better for a pressure vessel suitable. Second, there is no need to keep the plastic sharp when blowing it to give a defined container bottom, which means the otherwise unavoidable material thinning does not occur at the hard transitions. In addition, there will be a better one in general Wall division in the entire container, not just on the bottom, achieved.

Containers with an arched, pressure-resistant bottom have an essential Disadvantage, namely that due to the convex bottom of the container when filling E.g., just cannot stand up straight. This was known to be separated by Feet or angled support walls avoided creating a support connected to the bottom of the container. The manufacturing cost, the use of various Materials for the container and those to support and the inevitably used Adhesives make such a container unattractive.

These disadvantages are avoided with the present invention.

In the present invention, a container such as a beverage bottle is used or the like, created for the storage of a pressurized content, wherein the container has a base with an arcuate, convex or concave Has bottom wall. The bottom wall is preferably integrally formed with a Provided support structure of multiple wall thickness at the transition to the side walls of the container. As the preferred bottom wall is circular, are the retaining walls generally ring-shaped and tapered downward and outward from the bottom area and from the transition to the side wall to provide an enlarged support for the container to accomplish.

Therefore, the support preferably consists of two conical wall sections, which are each formed in one piece on the side wall and the bottom wall and in one piece are connected to each other at their outer ends. These wall sections are connected to each other, preferably by welding, connected so that a support with multiple Wall thickness results.

The inventive method includes forming the arcuate pressure-resistant bottom by inclusion of the tube or preform from which the Bottle is to be made inside a blow mold that is telescopically movable Parts has, with one of these parts determining the bottle bottom surface having. One blow molded part is in contact with the preform before while or brought after inflation to determine the final shape of the pressure floor.

In the preferred method according to the invention, it is precisely this shift that contributes the part of the blow mold that determines the bottom to form the supporting wall with multiple Wall thickness at. In particular, this shift determines the supporting wall Sections of the container are squeezed together and welded together.

In a manufacturing method according to the invention for a blown Plastic container is in a blow mold with relatively movable parts one part in contact with an inflatable enclosed in the blow mold Preform brought to this inflatable preform from its original one Deform state, after which the inflatable preform is given its final shape is inflated.

The invention will now be based on exemplary embodiments and on the basis of the enclosed Figures explained in more detail. They show: FIG. 1 a vertical section through a bottle according to the invention, which was produced by the method according to the invention; Figure 2 is a perspective view of the bottle in Figure 1; Figures views similar to Figures 1 and 2 of another 3 and 4 embodiment of the invention Bottle; Figures Views similar to Figures 1 and 2 of a further 5 and 6 Embodiment of the bottle according to the invention; Figures views similar to the Figures 1 and 2 again 7 and 8 further embodiment of the invention Bottle; Figures schematically the production method according to the invention 9 and lo for the bottle in Figures 1 and 2; Figures another according to the invention Manufacturing process 11 to 14 for the bottle in Figures 1 and 2; characters the manufacturing method according to the invention for the 15 to 20 bottles in the figures 3 and 4; Figures the process steps for the bottle in Figures 21 to 23 5 and 6; Figures schematically show the process steps for the bottle in FIGS. 24 to 29 FIGS. 7 and 8 and FIGS. schematically show the method steps for a relative 30 to 32 bottle modified from the bottle in FIGS. 3 and 4.

In Figures 1 and 2, a bottle 40 according to the invention is shown. The bottle 40 is generally cylindrical in shape and is, as well the other bottles according to the invention, formed in one piece. In particular, points the bottle 40 has a side wall 41 which merges into an annular closure 42 and is surmounted by this. The conclusion 42, as it is shown in particular, is suitable for receiving a conventional pressure lock, but the closure 42 can also be provided with a thread in whole or in part or can be closed by means of a snap lock. In general, can the termination 42 can be formed in the desired manner.

The side wall 41 merges into a lower, arched bottom wall 43, which can have a concave shape and completely above the lower edge or the "Foot" 44 of the bottle lies. The arcuate bottom wall 43 represents a so-called "Pressure base", because its spherical shape reduces the pressure inside the bottle can resist.

The bottle in Figures 1 and 2 is manufactured as it is in Figures 9 and lo is shown. According to Figure 9 comes a nice, freely extruded, tubular hose 45 from an upper, downwardly directed annular extrusion opening (not shown) out. This tube 45 is surrounded by two preform parts 46, which together form a cavity 47 which is closer to the shape of the finished bottle 40 when the hose 45 comes.

The preform parts 46 squeeze the tube 45; especially grab and pinch jaws 48 on each preform 46 on the tube thereby forming a "tail" 49 between the pinch jaws 48.

A blow head So is then inserted into the open upper end of the hose 45 used, with this die head tightly in the upper through the closed preforms 46 seated certain opening and engages at the upper free end of the hose to to hold on to this.

Then compressed air is fed through an axial channel 5 $ to the blow head So, in order to inflate the tube or the blank onto the shape of the cavity 47. As As can be seen, the preform 52 has a rounded, convex shape after blowing Ground on that by the actuation of the tail pulling Abquetschbacken 48 is completed down in a known manner.

The inflated preform 52 is then made into a final blow mold 55 brought, which forms an inner cavity 56 with the shape of the finished product Parts 55a and 55b can be opened and closed. As you can see, everyone knows these molded parts on a semi-cylindrical lower passage 57, in which a corresponding Shaped bottom molding 58 is arranged, wherein the portions 58 of the bottom molding can be opened and closed together with the molded parts 55a and 55b and additionally displaceable in the axial direction relative to the molded parts 55a and 55b are. The sections 58 of the bottom molding describe with their upper end at 58a and 58b a convex line.

For the last blowing process carried out in the form of FIG the preform is brought to the blow mold with the aid of the blow head So, and the molded parts 55a, 55b are then closed, the sections 58 of the bottom molding are in their retracted positions, as indicated by the dashed line in of Figure 10 is shown. After the mold parts 55a, 55b around the preform have closed, the sections 58 of the bottom molding of their lower Positions upwards in contact with the @ onve @ en @oden @@ of the V @ rf @ r @ ling ~ brings the preform upward to the concave shape of the final bottle is deformed, as shown with the solid line in Figure lo.

The advantages with the manufacturing method shown in FIGS. 9 and 10 for the bottle 40 of Figures 1 and 2 are obvious. Because of the bottle shape would arise with a direct inflation of a cylindrical blank or the hose to the final bottle shape, the greatest inflation of the blank exactly at the "foot" section the bottle, and thus a correspondingly weak base.

By using the telescopic bottom moldings 58 in the Blow molding parts 55a, 55b, it is possible to first slightly form the tubular blank to impart curved convex bottom 53 by inflation and then this bottom bend mechanically upwards to inflate into its concave shape, as shown in Figure lo. This results in a favorable inflation ratio, wherein the "foot" portion of the bottle is of greater strength and extends through the combination of the physical deformation of the preform with the inflation the final shape results in a bottle of substantially constant wall thickness. The initial contact of the bottom moldings 58 with the inflated Preform ensures that the wall thickness of the preform over the bottom and the foot section of the fully inflated bottle is retained.

Of course, this can also be done with a preforming inflation and a subsequent one final inflation as performed in preform 46 and blow mold 55 as the final inflation will be done at an orientation temperature in the above U.S. Patent Application No. 103,624 is. Thus, all the advantages listed therein can also be used with the present Ziflni he # aiter. en.

Essentially the same floor type is also used with that in the figures The modified method shown in FIGS. 11-14 is achieved. From Figure 11 it can be seen that the initial blank 59 is a freely extruded, depending tube which is surrounded by a preform 60 with the molded parts 60a, 60b. This preform is essentially the same as described in connection with Figure 9, with the exception of an annular groove 61 formed in that of the preform halves 60a and 60b certain cavity is cut.

This groove 61 surrounds the cavity a little above the section the cavity with which the convex bottom of the preform is determined. Through the following Inflating the tube results in the preform 62. This preform has a convex bottom 63, which - a little above the bottom - of an in of the groove 61 formed rib 64 is surrounded. This rib results in the essentially adjoining and conical surfaces.

Next, the tail of the preform is related as above with Figure 9 described or otherwise removed and the preform in a last blow mold 65 shown in Figure 12 brought. The last blow mold 65 has two Blow mold parts 65a and 65b that can be opened and closed and the together define a hollow shape 66 with open ends, the upper The end of this hollow shape has a recess 67 that determines the conclusion and that lower end of the mold is open at 68.

Separate ones sit telescopically over the blow molding parts 65a and 65b relatively movable bottom mold plates 69a and 69b, which together with the Blow mold parts 65a and 65b movable in the lateral direction for opening and closing are. The floor panels 69a and 69b are also telescopically axially relative movable to the blow mold parts 65a, 65b when the blow mold parts 65a, # 5b under the Pressure of the upper blow head 70 can be pushed down.

This blow head 70 has an axial air duct 71, as well as a lower conical portion 72 and on the circumference a shear edge 73, which above of the conical portion 72 is arranged.

When inserting the blow head into the upper opening of the closed Blow mold parts 65a, 65b give the surface of the blow head section 72 and the shear edge 73 the upper end of the preform G2 the final shape of the container, as described in US application 103,624.

Furthermore, when the blow head 7c is lifted downward, the molded parts 65a) 65b brought into contact with the lower floor mold plates 9a, 69b. The sublime convex, the floor-defining section 74, which is formed by the floor panels 69a, 69b is determined, contacts the lower end of the preform and bends the preform up through, so that the arcuate, concave bottom 75 of the finished bottle 76, as shown in FIGS. 13 and 14.

The location of the ribs 64 relative to the initial convex bottom 63 is such that this rib 64 of double thickness the bottom 75 of the finished Container 76 surrounds, creating a support surface for the finished bottle will.

Again, the preform can be made without any thinning at the soot section be inflated evenly, with the arched, concave bottom 75 circumferential rib 64 of double thickness substantially during the preforming Inflation is formed and the bottom with the help of the rib 64 at the junction the side wall with the bottom wall of the finished container 76 created support wall is reinforced with multiple thickness.

The method for producing the bottle according to Figures 3 and 4 is shown in FIGS. 15 to 20.

In Figure 15, the first shape for a preform 80 is shown, which is produced in separate blow mold parts 81,82, which together have a top and define hollow shape 83 open at the bottom. The lower end of the hollow mold 83 is through separate base plates 84 closed, which are supported on the blow mold parts 81, 82 are and join their transverse movement, with the plates 84 den At the beginning, squeeze off the existing hose in between, whereby the "tail" 80 arises.

The bottom plates 84 can also be in the axial direction relative to the blow mold parts 81, 82 for the parison are moved as by comparison FIGS. 15 and 16 can be seen. The displacement of the Bodenpiatten 74 can be in any Way to be carried out '. As shown, the downward stroke of the die can 86 after initial inflation of the initially present blank inside the Molded parts 81, 82 are used to follow the blow molded parts 81, 82 in a telescopic manner to slide down over the fixed base plates 84.

Die 86 is essentially the same as it is in context has been described with the foregoing embodiments of the invention. From figure 15 it can be seen that the cross-section of the preform 80 as it was initially formed is, towards the bottom of the junction of the bottom of the finished container and the side wall of the finished container to be reduced.

This groove in the preform is provided with the reference number 87. Below the point 87, the preform widens conically outwards at 88, this conical shape in the reverse tapered convex bottom 89 of the preform 80 passes. The transverse extent of the floor panels is 84 a little less than the transverse distance between points 87, where the difference is less than twice the wall thickness of the preform 80.

When the blow mold parts 81, 82 are displaced relative to the base plates 84, the base 83 of the preform is pressed upwards to the points 87 relative thereto. The amount of displacement of the mold parts 81, 82 relative to the floor panels 84 is designed so that the bottom wall 89 of the preform is aligned with the points 87, whereby a smooth convex bottom is formed for the preform 8o. Through the contact taking place under the pressure due to the relative movement of the mold parts between the still hot plasticized material 89 of the bottom and the same material at the point 87 are in the immediate vicinity of the outer edges of the floor panels 84 the points 87 are welded to the ground, the weld being complete takes place around the points 87.

In reality, the relative movement taking place in a telescopic manner of the moldings # 1, 82 and the bottom plates 84 the tapered sections 88 of the side wall of the preform and the bottom wall 89 at a point above of the bottom end of the preform being squeezed, thereby generally conical Sections 96 of double thickness are formed on the preform. The conically continuous Sections 88 of the molded parts 81, 82 form recesses into which the folded over Sections 96 of the preform by moving the bottom panels 84 outward be pressed.

As shown in Figure 17, the preform is completed the pressure of the blow head 86 is released, so that the mold parts 81, 82 and the bottom plates 84 move relative to each other and in their initial positions return according to FIG. This resetting of the blow molded parts for the preform is shown in FIG. When lifting the mold parts 81, 82 relative to the plates 84 the tail 85 of the preform is removed.

Then the finished preform 80 is put into the final blow mold 9o brought, which consists of two blow mold halves 9oa, 9ob with an inner cavity 91 which has the shape and size of the finished bottle. Each blow mold half 9oa, 9ob has a base plate 92, which is open and closed together with the respective mold half 9oa, Sob is movable in the direction and in the axial direction can be moved relative to their respective mold half. Any floor slab is provided with an upper arcuate recess 93, these recesses together form the shape for the bottom of the finished bottle. Furthermore, each has Bottom plate 92 has a semi-conical outer surface 94 on its side, this Outer surface with the conical located below the blow mold recess 91 and associated side surfaces 95 of the blow mold halves 9oa, 9ob cooperates.

The surfaces 95 can be the squeezed sections 96 of the preform 80 that have previously been formed as described above.

The shape and size of the cavity 91 of the blow mold are such that the Preform 80 inside cavity 91 on an annular lower lip 97 of the cavity 91 is seated at the junction of Cavity 91 with the conical surfaces 95 is arranged.

Thereafter, the blow head 86A (similar to the blow head 70 of the previous described embodiment in Figure 12) into the open upper end of the preform 80 inserted, and the blow head then presses the blow mold halves 9oa, 9ob relatively to the base plates 92 downwards. This relative movement between the blow mold halves 9oa, 9ob and the bottom plates 92 brings the upper arcuate surfaces 93 of the Plates 92 in contact with the bottom of the preform, the conical surfaces 94 of the plates 92 cooperate with the conical surfaces 95 on the mold halves, to compress the previously folded over portions 96 of the preform. This The process is shown in FIG.

Then it is used to inflate the preform to the exact shape of the final bottle as defined by the hollow shape 91 and the top arcuate Surfaces 93 of the floor panels 92 are intended to be supplied with compressed air via the blow head 86A. At the same time, of course, the end of the bottle is made with the blow head redesigned and completed as above and in particular in the above application is described in more detail.

Due to the mechanical deformation and the pressurization of the Previously crimped sections 96 result in a conical bottom support wall 99 with double thickness for the finished container loo, with double the plastic layer for the formation of the retaining wall 99 essentially over their entire Length is welded.

In essence, then, this supporting wall becomes outward through the two inclined sections on the circumference of the preform by squeezing them together Sections as described above in the Eusmmenhang with Figures 16 and 17 and formed by a subsequent, final application of pressure according to FIG. The one section is in one piece with the side wall of the container and the other section in one piece formed with the bottom wall of the container, these sections at the bottom are integrally connected to each other, as the plastic to form this support wall or the foot was merely bent backwards.

It turns out the welding ate for most, thermoplastic resins used in pressure vessels, e.g.

Polyvinyl chloride and polyethylene, at relatively low temperatures, z.ß. from 1040 C, is possible. As long as the method step according to FIG takes place at a temperature above the minimum welding temperature, a Support wall 99 of multiple thicknesses can be formed.

From this description, the structure of the in Figures 3 and 4 bottle shown loo be clear.

As can be seen, the bottle according to Figures 5 and 6 has a slightly different structure than the one previously described.

In particular, this bottle has a generally cylindrical shape Main body section llo with an upper termination 111.

Again, the shape of this termination can be whatever you want Be formed bottle cap.

The bottom 112 of this bottle is convex and one piece thus formed, drooping and slightly outwardly inclined cone search support surface 113, which at 114 is made in one piece in a similarly inclined and conical support wall 115 passes, which in turn are formed in one piece with the side walls 116 of the container is.

The outer surface of the inner wall 113 is flush with the inner surface of the outer wall 115 welded or otherwise connected, creating a floor support for the bottle is created with multiple thickness and the bottle bottom 112 is convex and thus can train pressure resistant.

The manufacturing process for the bottle in Figures 5 and 6 is shown in Figures 21-23.

In FIG. 21, a preform 120 is shown which has previously been inflated a hose was brought to this shape. This preform is in the generally formed in the same manner as the preform in FIG. The preform 12c has the side walls 121, which are connected to the convex bottom wall 122 via a Foldable connecting portion 123 are connected. This hinged connecting section 123 is connected to the side walls 121 via an outer bead 124 on the circumference, which located directly below the conically outwardly inclined side wall sections 125 is located.

These side wall sections will later become the outer support wall L115 formed for the finished container. The foldable wall 123 will at the same time to the inner support wall 113 in the finished container and is connected to the bottom 122 connected via an inwardly protruding bead 126.

The preform 120 is inside two separable blow mold halves 127, 128 with an upper end of the bottle determine the opening 129 and one The lower opening 130 is suspended, generally with the upper opening facing outwards Bead 124 is aligned in the lateral direction. There are also separate floor panels ~ 131, 132 are provided for each mold half 127, 128, these bottom plates 131, 132 in can be separated laterally with the mold halves, but in the axial direction are independently movable relative to these. Each bottom mold plate 131, 132 has a concave top surface 133 for contact with the bottom 122 of the preform 120 on.

Outwardly and downwardly sloping semi-conical surfaces 134 are; an each bottom mold plate 131, 132 for contact with the foldable portion 123 of the preform 120 is provided, as well as generally parallel thereto, downwardly and ocularly inclined semi-conical sections 135 on each blow mold half 127, 128 for contact with the sections 125 of the preform 120.

1First, a die 136 is lowered into position to the open upper end 129 of the blow mold halves 127, 128 to close and the upper End of preform 120 relative to the mold halves 127, 128 to be held. Simultaneously with this, this blow head 136 forms the container closure in the same Way as previously described and in particular in the above application has been.

With a further downward movement of the blow head 136 push the blow mold halves 127, 128 telescopically into the base plates 131, 132, until the parts assume the positions shown in FIG. 22 with respect to one another. At a such telescopic movement, the bottom 122 of the preform 120 becomes vertical pushed upwards, the "hinge" 126 touching the edges of the bearing surfaces 133 of the floor panels, so that the floor panel surfaces 134 on the outside attack the portion 123 of the preform. As well as the floor panels 131, 132 move relatively upwards, this abutment will find the outer surface of the section 123 instead of the surfaces 134, and the conical sections 125 of the preform are pressed outwards into contact with the surfaces 135 of the mold halves. Simultaneously compressed air is supplied via the blow head 136, whereby the preform against the The hollow shape of the blow mold halves 127, 128 is inflated.

Due to the telescopic movement of the mold halves, the parts of the preform is folded and then squeezed, the immediately above of the bottom portion 122 of the preform, at the same time the bottom portion 122 of the preform is raised. Therefore the surfaces press 134, 135 the sections 123 and 125 of the preform in mutual contact, around to weld them together and so one the bottom 112 of the finished container to form surrounding retaining wall of multiple thickness.

The bottle 139 shown in Figures 7 and 8 has side walls 140, which are surmounted by a closure 141 of any type. The side walls 140 run conically outward at the lower end of the bottle as support walls 143, with the lower outer end of the bottle is integrally formed into an inwardly concave at 144 Bottom wall 142 merges. The curved bottom wall 142 is hemispherical so that the lower end portions 145 of bottom wall 142 generally about the longitudinal axis of the bottle are conical, as will be explained in detail later, the conical Sections 145 and 143 of the bottom 143 and the side wall 140 to form a Multi-thickness retaining wall for the floor are welded together.

The manufacturing process for the one shown in Figs Bottle 139 is shown in Figures 24-29.

As shown in Figure 24, the first step is manufacturing the bottle 139 of FIG. 7 that consists of a spray head 146 with an opening directed downwards Exiting hose 147 is cut off in a known manner by means of a knife 148.

Before cutting, the blow mold for the preform is in brought a position in which it encloses the preform in to the the blow mold halves 150a and 150b are closed, as in plastics technology is well known. The mold halves 150a and 150b have two at their lower ends Pinch elements 154, which open and close together with the blow mold halves can be, but are movable in the axial direction relative thereto, as is known and was previously described.

The blow mold halves 150a, 150b form a hollow mold for the preform 151, the one between the shape of the tube 147 and that of the final bottle 140 has a lying shape. This hollow form 151 has a circumferential one Recess or groove 152 between the sections defining the side wall the hollow mold 151 and the bottom-defining portion 153 of the hollow mold 151 are arranged is. As can be seen, the bottom wall defining portion 153 is the cavity convex, that is exactly in contrast to the concave shape of the finished bottom wall 142 of the Container 140. When the blow mold halves are closed, the elements 154 of the Hose 147 squeezed off, the lower squeezed off section or "tail" 155 of the tube lies completely outside the actual hollow shape 151.

As shown in Figure 25, the next step becomes a die 156 inserted into the cut open top of hose 147 and pressurized air inserted into the interior of the tube 147. The tube 147 then inflates the preform 157, the one surrounding the preform on the circumference, between the side walls and the bottom 159 lying bead or rib 158 having. As can be seen, the rib has an axial and a radial extent, where the rib mainly by two mutually inclined, conical rib walls is formed.

After the tube 147 has been inflated onto the preform 157 the tail 155 is removed by the downward stroke of the elements 154. Thereafter the mold halves 150a and 150b are opened, and the one held by the die 156 The preform is taken out for the subsequent process.

As shown in FIGS. 27 to 29, the preform 157 becomes brought to the last blow mold 160, which consists of the opening in the transverse direction and closing blow mold halves 160a and 160b. In Figure 27 are the blow mold halves closed, while they are open in FIG.

The closed blow mold halves 160a, 160b define a cavity, whose shape generally corresponds to the shape of the bottle 139 and ei the the upper end 161 and the lower end 163 are open. The blow mold halves 160 are shorter than the preform 157, the lower open end 163 of the blow mold halves 16oa> 16ob immediately next to the rib 158 of the preform 157 and above the Bottom 159 of the preform is. Each blow mold half 160a, 160b has a bottom plate 164, with these opening and closing bottom plates halfway with the blow mold 160a, 160b are movable. Furthermore, the floor panels 164 are in the vertical direction (axially to the preform 157) relative to the mold halves 160a 160b movable. In particular, these base plates 164 each have a spherical surface 165, which are arranged in the middle of the complete blow mold 160 and in general to match the shape of the bottom 142 of the finished container and have a conical shape Surface 169 into a lower recess 166 for the lower open end of the associated Blow mold halves 16oa, 160b run out. A vertical guide surface 167 extends up from recess 166 on its outside for guidance a vertical displacement of the bottom plates 164 relative to the blow mold halves 160a, 160b to take care of.

For inflation, a blow head 170 is inserted into the open top end of the preform 147 used. This blow head 170 has a conical surface 171, which in the open end of the preform 157 is used, as well as a bottle closure defining recess 172, which is used to form the finished closure 144 of the bottle 139 cooperates with the upper end of the blow mold. There is a channel 173 in the blow head provided for the compressed air with which the preform is given its final shape is inflated.

As shown in FIG. 28, the thrust of the blow head 170 against the open upper end of the blow mold 160, the blow mold relative to the bottom plates 164 telescoped downward, with the lower open end of the blow mold halves 160a, 160b penetrates into the recesses 166. With such a telescopic Movement, the part-spherical surfaces 165 of the floor panels 161r touch the ground 159 of the preform 157 and bend the Bottom 159 up in the concave shape of the final bottom wall 142 through. Through this upward movement of the bottom wall 159 of the preform, the bottom wall 159 actually folds at the circumferential rib 158 of the preform 157, which is located at the point of contact between the blow mold halves 160a, 160b and the bottom plate 164 is located.

During the telescopic movement, the touch at the lower ends of the blow mold halves, frustoconical wall portions 168 recessed the outside of the preform immediately above the rib 158, while the conical surfaces 169 directly at the transition to the part-spherical surface 165 at the bottom of the recess 166 the outer surface of the bottom wall 159 of the preform immediately below the Touch rib 158.

As shown in Figure 28A, the faces 168, 169 are somewhat differently inclined, with the surfaces facing each other when fully inserted approach, whereby the support wall sections 143, 145 are squeezed together, such as has previously been described in connection with FIGS. 7 and 8.

The material that originally formed the circumferential rib 158 of the preform 157 was formed, now forms the lower connecting portion 144 at the lower outer end of the container, this material being used for the transition between the one-piece walls 143, 145 was simply folded around itself. Because the surfaces 168, 169 compress the material along a surface and the material still When it is hot, the walls 143, 145 become several times thick to form the floor support welded together for the container 139.

Finally, after the return movement of the blow head 170, the Blow mold halves 160a, 160b opened, thereby releasing the finished bottle 139 as shown in FIG.

As can be seen, is in each of the manufacturing processes described here inflation on a preform is provided as a process step. The production but can also take place without such an intermediate step. This method is shown in detail in FIGS. 30 to 32. The shape of the after the procedure The bottle formed in accordance with FIGS. 30 to 32 is shown in FIGS. 3 and 4. However, the process is just as suitable for other bottles.

In detail, FIG. 30 shows the closing of a blow mold 180 by one with a broken line shown hose 181 to squeeze this and him to give an inflatable shape.

In detail, the blow mold 180 has two blow mold halves 180a 180b, which can be closed laterally around the extruded tube 181. The hollow mold 182 formed by the blow mold 180 has an upper end of the bottle determining section 183, as well as a middle determining the side wall Section 184 which terminates in a lower inwardly directed rib 185 which a lower cylindrical recess 186 overlaps.

The rib 185 has a part-spherical overhead surface 187 on, which is in the side wall-defining section 184 of the associated blow mold half 180a, 180b passes and the partially the Bottom of the finished container certainly. As shown in FIG. 188, the underlying surface of the rib is tapered and defines a portion of the floor support wall 99 of that shown in FIGS Container.

In each semi-cylindrical recess 186 of the mold halves 180a, 180b there is in each case a squeezing jaw l9o, which is connected in the transverse direction with the associated Blow mold half and in axial resp.

vertical direction is movable relative to it, as described above. The upper surface of the jaws 190 is curved so that a smooth Transition to the floor-defining wall section 187 of the associated hollow mold half 182 stands at 92. The radially outer portion of each jaw 190 is below the rib 185 and thus the conical surface 188 opposite. The outer section 192 of the pinch-off elements 190 is conical in shape parallel to the surface 188 and is from her in the axial direction at a distance when the Abquetschbackenl9o assume the position shown in FIG.

As also shown in Figure 30, the hose 181 is with the aid one inserted into the open upper end of the hose and with the sections for the closure of the bottle on the blow mold halves 180a, 180b cooperating blow head 194 inflated.

When the squeezed-off hose is inflated, it is directed outwards pressed against the walls of the blow mold halves 180a, 180b, in which case the tube in attachment with sections 184, 187, 188, 192 and with the recess 186 above a short cylindrical one Length comes as shown in Figure 30 is.

After inflating and while the tube is still hot, become the pinch-off elements 190 moved upwards relative to the blow mold halves 180a, 180b, as can be seen from a comparison of FIGS. 30 and 31. Preferably this is Movement carried out through the ilub of the blow head 194. Through this relative movement of the pinch-off elements 190 to the blow mold halves are the portions of the inflated Preforms which touch the surfaces 190 which determine the bottom, in the aligned position brought with the surfaces 187 of the blow mold halves, so that a smooth running results in convex bottom for the finished container. This relative movement will be also the conical surfaces 188, 192 touch the portion of the inflated Preform brought into contact and welded, creating a below the Bottom of the finished container lying supporting wall of multiple thickness results.

After welding, the blow mold halves are in position 30 moved back, with the relative movement of the squeezing jaws 190 down the tail is removed from the finished container.

Thereafter, the blow mold halves 180a, 180b in the lateral direction expanded, and the die 194 is moved up to release the finished Container withdrawn.

Claims (13)

Claims 1. Blown plastic container with a top and one-piece side walls extending therefrom, characterized in that the one-piece container foot an arcuate pressure-resistant bottom wall formed in one piece with the side walls (112), as well as an outwardly inclined, integrally formed with the bottom wall circumferentially extending wall section (113) and a second to the outside inclined wall section (115) extending in the circumferential direction, which is integral with the side wall is formed and surrounds the first wall portion, said Wall sections at their lower ends to form a support edge (114) for the Containers (110) are integrally connected to one another and are continuous with one another are welded to the support edge in one piece, creating a support wall with multiple wall thickness is formed and wherein the side walls, the bottom wall and the two wall sections were jointly subject to the same thermal process. 2. Plastic container according to claim 1, characterized in that the bottom wall (112) is convex and the bottom wall section (113) is conical is so that it surrounds the bottom wall and protrudes downward that the bottom wall and the wall section is integrally connected to one another on the outer circumference of the bottom wall are and that the second wall section (115) is also conical and substantially all of the outer surface of the floor wall section Length touched extensively. 3. Plastic container according to claim 1, characterized in that the bottom wall (142) is concave and completely above the two wall sections (143, 145) and that the wall sections are each conical and are in limited contact immediately next to the annular support edge (144). 4. One-piece, blown plastic container axially spaced located head and foot sections, which are connected by an annular side wall are, characterized in that the foot section has an arcuate bottom wall (112) has, which over an outwardly conical and in an annular Support edge (114) below the container bottom (112) ending wall section with the side wall (116, 115) is integrally connected, this wall section (113)> the bottom wall (112) and the side wall (116all5) share the same thermal Process subject to that the side wall one integrally formed thereon has conical lower portion (115), which at the support edge with the from Floor extending wall section (113) is connected and that the extending from the floor Wall section surrounds the lower section of the side wall and it up to the support edge touches, with the touching portions of the foot forming with each other a layer continuously fused into one piece with double thickness underneath connected to the bottom wall. 5. One-piece, rotationally symmetrical plastic container, marked by integrally connected side and bottom walls, which are common to the were subject to the same thermal process, with the bottom wall being arched is and is limited by a wall depending therefrom, the annular bottom edge of which which forms one axially outer end of the container, furthermore the side wall also has a depending portion terminating in an annular edge, which has the same circumference as the edge of the wall and is integral with this edge is formed and this side wall section surrounds the wall and this, adjoining the edge, areally touched and wherein the touching sections of the side wall portion and the wall continuously with one another in one piece are connected to an annular floor support of multiple thickness for the container to build. 6. A method for producing blown articles, characterized in that that An inflatable tube is formed that the tube is in a blow mold with axially relatively movable parts is included that one of the parts in contact is brought to its shape change with the hose and that then the deformed Hose inflated to the shape of the finished product as it passes through the parts is determined in their shifted positions. 7. The method according to claim 6, characterized in that a section of the tube is squeezed off during the displacement of a blow molded part in order to forming a multiple thickness portion on the finished product. 8. The method according to claim 6, characterized in that two conical continuous sections are formed on the hose and that the conical sections of the tube are squeezed together during the displacement of a blow molded part. 9. a method of manufacturing a blown container or the like, characterized in that a tube on a preform with a closed is inflated adjacent to two conically continuous surfaces that the end Preform is deformed before inflation to form the conical surfaces the double-thickness wall section surrounding the closed end of the preform weld together and that the preform is inflated to the final container shape will. 10. a method of manufacturing a blown container or the like, characterized in that a preform having a closed end and a the preform is formed at the closed end surrounding radial hollow rib that the preform is telescopically displaceable into a final blow mold Moldings is brought that the moldings are telescoped to (1) to deform the sealed end of the preform; and (2) to deform the rib below the deformed end of the preform to compress itself, and that the preform is inflated inside the telescopically displaced mold parts will. 11. Process for the production of a blown container or {the like, characterized in that a tube inside a blow mold with telescopic Slidable molded parts is introduced, each molded part having a conical surface has and these surfaces are generally parallel to each other that the tube essentially resembles the shape of the finished container with the exception of its inflated sections on the conical surfaces is inflated and that the moldings telescoped to align the inflated conical sections with each other to bring sealing into engagement. 12. A method for producing a plastic article, the support portion of which has a multiple wall thickness, characterized in that a tube inside a shape with relatively moving parts inflated that when inflated, tapered portions of the article on the respective Molded part are formed that these molded parts are shifted relative to each other, to bring the tapering sections into contact and that the tapering ones Sections welded to form a support section with multiple wall thicknesses will. 13. Process for the production of a blown plastic article, characterized in that a hose with adjacent, relative to each other in the opposite direction tapered sections is formed that this hose is enclosed in a blow mold with parts that can move relative to one another, which are aligned with respect to the sections tapering in the opposite direction, and that substantially simultaneously the tube is inflated inside the blow mold is and the mold parts are moved relative to each other to the tapered Welding sections together.