DE2063402A1 - Container made of thermoplastic plastic film and method and device for its production - Google Patents

Description

PATENT LAWYERS 2 O 6 3 A O

Dipl.-Ing. El DE N El ER Dipl.-Chem. Dr. R U F F Dipl.-Ing. J.BEIER

7 STUTTGART 1 Neckarstrasse 50 Telephone 22 70 51

December 19, 1970 - JB / Va

der: ISr. Thomas Bitter, Blonay sur Vevey / Switzerland, and Sous Bois

Dipl.rer.pol. Roland Veitinger, 731 Plochingen * Panoramastr.

JLBJlSl

Containers made from thermoplastic plastic film and processes and apparatus for its manufacture

The invention relates to a method for producing Containers made of thermoplastic plastic film with a container part and a preferably as a thin closure part serving neck section, as well as a device for Carrying out the process and a container with a bevel, with a larger one and a closure part forming neck section with a smaller wall thickness.

There are known such containers in which the container is partially used to hold goods, while the neck portion, which consists of very thin-walled material, can be twisted or folded together as a closure. These containers, also known as quivers, usually consist of a jacket for the container part, which consists of a cellulose film in the lOrm of a truncated cone

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is laid and glued, a separate inserted and glued bottom and a separate neck portion made of very thin cell glass. The production of such a container is extremely cumbersome, since it is a total three parts made separately, brought into the desired truncated cone shape by gluing and then together need to be glued. The ones running along the surface lines Mowing and the gluing of the floor are always the critical points at which the container is damaged will. The seams can also tear and are rarely tight.

It is also known in the injection molding or deep drawing process en manufactured cup-like containers to be closed with a lid that is either turned up or flanged or is sealed. These containers that predominantly are used for liquid media, always require two separate parts, namely the actual container and the lid, which not only makes production more expensive, but also complicates packaging, since two Parts fed separately to the filling machine and together need to be connected.

The object of the invention is to create a method according to which the container of the type mentioned at the outset is simple and are economically producible. In addition, a device for carrying out the method and a container be created, which facilitates the packaging and the closing process with extremely economical production.

To create a process that solves this task, is proposed according to the invention that a heated to its deformation temperature film section in his clamped outer edge area and at a distance from this

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ßandbereich is detected sealed along a closed line or annular surface that the between the edge area and ring area formed by stretching to a neck portion and the central area enclosed by the line by blow molding or vacuum deformation, optionally with mechanical pre-stretching, deformed into a container part will. -

Eb will also provide a device for performing this Proposed method that a clamping frame for the edge area of the film section and a negative mold for the container part with devices for blow molding or vacuum deformation, in which between the opening the mold cavity, the negative mold and the inner boundary of the clamping frame a distance is provided at which the negative mold is substantially relative to the clamping frame is arranged displaceably perpendicular to its plane, in which a subframe on the opposite of the negative mold Side of the film section is arranged displaceably parallel to the negative mold and in the the subframe to rest along a closed line or ring surface on the film in the area of the opening the negative mold is formed.

The invention also provides a container as described in the introduction mentioned type created in which the container part with its bottom and the neck portion from one piece thermoplastically deformable material is made. The container can advantageously be between the container part and the neck portion have a ring area of greater material thickness. At the free edge of the neck section can be followed by a reinforced, laterally protruding ring. This ring is created automatically when the container is manufactured according to the method mentioned at the beginning.

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It is the band area of the film section that was clamped in the tenter frame.

The container of the invention has numerous advantages. It is made in one piece in a single operation manufacturable, extremely stable with low material consumption and has a pleasing appearance. The wall thickness distribution can be made optimally, so that despite a production by deep drawing, in the one correct wall thickness distribution is always difficult, the highly stressed areas have an increased wall thickness can. These are in particular the bottom, the upper hand of the container part (connection between the container part and neck section) and possibly the upper edge of the neck section. When empty, the container can be stacked and the packaging of goods is considerably simplified, as only one part for the entire container including Closure must be fed. The neck portion forms a kind of funnel through which the goods to be packaged can be easily introduced into the container, and the Closure can be carried out automatically by twisting the shark safe cut and / or by using a commercially available clip will. Another advantage is that the neck portion forming the closure cannot be lost, so that together with an easy resealability of the container also has advantages in use.

Further advantages and features emerge from the subclaims and the description in conjunction with the drawings emerged. Some embodiments of the invention are shown in the drawings and will be described below explained in more detail. Show it

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Fig. 1 is a perspective view of a Container according to the invention,

2 shows a perspective view of a modified embodiment,

3 shows a schematic section through a container,

4 shows a schematic representation of an apparatus for producing a Container,

FIG. 5 shows the device according to FIG. 4 in one second working position,

6 shows the device according to FIG. 4 in a third working position,

7 shows the device according to FIG. 4 in a further working position,

8 shows a detail of the device and

Fig. 9 is a schematic representation of a modified device.

1 shows a container 11 which has a container part 12 and a neck 13. The container part has the shape of a slightly conical cup with a base 14 and a dumbbell part 15. The upper end of the container part is formed by a reinforced ring area 16 which runs around the container. Closes to this the Haisaneatz 13, which in the illustrated example

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11, «Μ» -β-

play runs in extension of the shell part 15, d. H. also had the shape of a truncated cone.

As can be seen from FIG. 1, the shark attachment is 13 the closure part for the container. It can be summarized in the manner shown and with a usual Clip, tape or flexible strip 17 held together will.

In Figs. 2 and 3, an embodiment is shown, which in most details with that of Fig. matches. These are therefore not explained again. The opening of the neck extension 13 closes at This AusfÜhrutigsform, however, an outward one Ring 18 made of stronger material. This makes it much easier to twist the locking part together Shark attachments because you can hold the ring with your hand or a capping machine. The ring 18 arises, as will be described below, in the Manufacture of the container according to the method according to Invention anyway, so that only needs to be trimmed on a punching of the edge.

As can be seen in particular from FIG. 3, the Wall thicknesses of the one-piece container in all of its filing different and adapted to the respective requirements. In the case of the container shown, for example a transparent deep-drawable plastic film of 600 / Sn thickness is used as the starting material, so that the Edge 18 also has this thickness. The neck base 13 has a thickness of 50 Apß, the adjoining ring area 16 300 ^, the coat 15 200.0 m and the floor 25o to 300 y «m. With the lowest possible consumption of material, a container can thus be created which has sufficient strength and strengthened in particular because of the middle

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Ring area can be easily handled. In addition to the shape shown, there are numerous other shapes for the container Shaping possible, it is only necessary to ensure that the container should preferably be demoldable, which however, this is usually the case anyway with smaller wall thicknesses.

4 to 7 show a preferred apparatus for producing a container in four process stages. The device has a clamping frame 20, which consists of an upper part 21 and a lower part 22. The two parts 21, 22 of the clamping frame can be moved towards and away from each other and cover the edge region 23 of a film section 24. The clamping frame 20 thus holds the edge region 23 of the film section 24, which will later become a ring 18, firmly clamped. In Fig. 4 below the film section 2M- a negative mold 25 is arranged, which can be displaced by a hydraulic or pneumatic actuating device (not shown) via a stamp 26 'along the central axis 27 of the device. The negative mold 25 has a mold cavity 26 which later has the outer shape of the container part 12. In FIG. 4, above the film section 24 or the clamping frame 20, an auxiliary frame 28 is arranged, which can also be moved along the axis 27 by actuating devices (not shown). Like the mold cavity 26, the auxiliary frame is only open on its side facing the film section 24, but sealed on the other side. In the subframe lies a pre-stretching die 29, which protrudes through the subframe 28 in a sealed manner with its actuating rod. The pre-stretching die 29 has a shape which, although similar to the outer shape of the container part, is smaller in size. The Pro

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However, the recketempel has no sharp edges * In that Vorrecketempel there are blow openings 51, which over the actuating rod 30 to a compressed air supply 32 are connected. In the following, with reference to FIG The operation of the device is described through 7 through 7: The clamping frame is used to insert the film section 24 20 opened and the subframe raised together with the pre-stretching temple. The on their deformation temperature heated plastic film is then clamped by closing the clamping frame 20 in its edge area, and

. the subframe 28 is together with the Vorrecketempel 29 lowered until the lower belt 35 of the Subframe in the area of the opening 54 of the negative form sits on the film section 24 and clamps it. This position is shown in FIG. It can be seen that the rend 55 of the subframe 28 is the film section sealingly spans along a closed line or an annular surface, so that the film section 24 is now divided into three areas! the one from the stenter 20: 'clamped edge area 25', a negative shape formed between the clamping frame and the auxiliary frame or a negative shape Ring area 35 and one in the area of the opening of the negative mold lying top area 36. It is important that through

£ corresponding distance of the opening of the negative form from the Inner diameter of the clamping frame 20 of the ring area 35 has a certain width, since this distance is also decisive for the material thickness of the shark section 13.

From Fig. 5 it can be seen that the next step the three sliding parts of the device, the negative form 25, the subframe 28 and the pre-stretching die 29, are simultaneously moved downward in FIG. Run thereby

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the negative mold 25 and the subframe 28 with the same Speed down and keep the film section 24 clamped between them while the pre-stretching stamp to lead a little, d. H. can run at greater speed.

6 shows the end of this downward movement. The ring area 35 was greatly stretched so that it now has a relatively smaller frustoconical neck section Wall thickness forms · Ba the film between the lower Volume 33 of the subframe and the area of the opening the negative mold on the one hand and was firmly clamped in the clamping frame 20 on the other hand, it is ensured that only the ring area 35 is stretched towards the neck extension 13 Has. The smock area 36 of the film is through the pre-stretching die 29 and has roughly the shape of a rounded cone. The later Bingflädie 16, the is clamped between the auxiliary frame and the negative mold, however, has changed little in diameter. In In the position shown in FIG. 6, the device stops and the final shaping of the container part takes place 12 initiated by blow molding. For this purpose, compressed air is passed through the compressed air connection 32 through the Blowing openings 31 supplied so that the film in the smock area. 36 applies to the mold cavity 26 and the final shape of the container part 12 assumes. The air still in the mold cavity can be drilled through 37 escape.

The container 11 is thus completely formed. After a certain cooling time, the Vorreckstempel 29 and Subframe 28 raised, the clamping frame 20 is opened, and the container 11 can be removed. For easier removal, it is also possible to use the negative

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form 25 »while the stenter is still closed, to continue downhill and then the clamping frame 20 to open at the bottom.

In the embodiment shown schematically in FIGS. 4-7, the subframe 28 sits on the upper one Face of the negative form flat, on. This forms the container 11 in the area of the annular surface 16 one after outward-facing step, which may be undesirable. Furthermore, the resulting kinks during the stretching or blowing undesirably high stresses arise, which can lead to the film becoming hot. This grande becomes, according to a further characteristic, the Invention, the embodiment shown in Fig. 3 of the proposed lower band 33 of the subframe. Of the lower edge 33 is formed protruding outward and has a contact surface 38 which has the shape of a truncated cone that tapers at the bottom. The investment fee 38 does the same. Slope like the one corresponding to © Ober® edge section of the negative fora 25V so that the film when it is completely deformed (pulled out in FIG. 8 shown), runs through with almost no paragraph ·, hit dashed lines is the film at the beginning of the deformation indicated. It can be seen that the design According to FIG. 8, an extremely good retention of the film is made possible precisely when it is particularly is important, namely at the beginning of the deformation. The easy Allows kinking of the film in the area of the contact surface 38 also an adaptation of the wall thickness of the ring surface 16 and a very good seal or tightness. In addition, the subframe 28 is made in the negative shape centered. The width of the annular surface 16 can be through Choice of the width of the contact surface 3B can be varied.

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In Fig. 9 eats a device shown in which the Neck 13 is reshaped by blow molding. For this purpose, the gate direction is otherwise identical with the lower part 22 of the clamping frame 20, a molded part 40 combined, which between itself and the subframe 28 forms an annular mold space 41. The shaped surface 42 of the shaped part 40 can have the shape of a truncated cone and in the position shown in FIG. 9 (corresponding to FIG. 6) a straight connection between the inner diameter of the clamping frame and the clamped ring surface. However, he can also, if so desired is to have a different shape, so that the base of the neck takes on a different shape.

This measure prevents the neck from being given an inwardly fluted shape which it is inclined to adopt as a result of the regularities of the drawing process. The base of the neck will therefore assume a shape after stretching, which is indicated ^{in FIG. 9 by the dashed line 13 f.}

As can be seen from FIG. 9, it is on. the subframe 28 a circumferential shoulder 43 is provided, the sealing can sit on the clamping frame 20 and thus seal the molded ring space 41. Compressed air is supplied through blow openings 44 blown into the mold ring space 41 so that the neck extension 13 'rests against the mold surface 42 and its shape accepts.

It should be noted that in many cases it will not bother when the base of the neck has the slightly inwardly fluted shape, so that often on the reshaping of the base of the neck can be dispensed with.

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Ee iet to recognize that numerous modifications are possible within the scope of the invention. For example, instead of the blow deformation described, vacuum deformation can be used, for which only minor changes to the device are necessary. ^- Instead of blowing openings J1 could be sucked through the holes 37 then, while the auxiliary frame need not be sealed to the top 28, but must be ventilated. The same procedure can be used for Haehformung. It is important to ensure that the edge 33 of the subframe

b is well rounded, so a good and possibly tension-free flow of the material is guaranteed. According to the method and with the device, numerous Forms of containers are made. For example, the container part instead of the truncated cone shape also have spherical or other shapes, and the shark approach does not necessarily have to be truncated cone föxm-ig. It can also be made into other shapes by reshaping it accordingly. By varying the fora des Pre-stretching die, the feed speed and the Size of the surfaces 35 and 36 can be the wall thicknesses to be adapted to the respective circumstances »Ee is still noted that after the molding process described in a

™ container according to FIG. 1 nor the ring 18 by a punching process being cut off-

The method according to the invention also makes it possible to color the individual sections differently. Apart from the fact that in the preferred use of transparent plastic material a colored Material takes on different shades of color anyway due to the different wall thicknesses, can also completely Different colors can be used for each section, for example by placing the foil in the

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Ring area 35 is colored differently than in the sand area and / or mid-range. After the deformation, the corresponding areas are then colored differently.

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Claims (1)

a 13 104/05 -14 - 2063402 A Q 8 ρ r u c b e Process for the manufacture of containers from thermoplastic Plastic film with a container part and a preferably serving as a thin closure part Neck section, characterized in that. a film section (24) 'heated to its deformation temperature in its outer edge region (23) clamped and at a distance from this edge region (23) along a closed Line or ring surface (16) is detected in a sealed manner that the between the edge region (23) and the closed Line or singing surface (16) formed ring area (35) by stretching to a neck portion (13) and the lüttelbereich enclosed by the line or ring surface (16) (36) by blow molding or vacuum deformation, if necessary with mechanical pre-stretching, is deformed into a container part (12). Method according to claim 1, characterized in that the neck section (13) is reshaped by blow molding or vacuum deformation. 3. The method according to any one of claims 1 or 2, characterized in that for different coloring of Container part (12) and neck section (13) or edge \ · Rich (23) in the edge area (23), ring area (35) or middle area (36) differently colored JPoIienabschnitt is used. 2 0 9 8 2 7/0821 A 13 104/05 - 15 - 4. Apparatus for performing the method according to a of claims 1 to 3 with a clamping frame for the edge area of the film section, a negative mold for the Container part and with devices for blow molding or vacuum deformation, characterized in that between the opening (34) of the mold cavity (26), the negative mold (25) and the inner boundary of the clamping frame (20) a distance is provided that the negative mold (25) relative to the Clamping frame is arranged displaceably essentially perpendicular to its plane, that an auxiliary frame (28) on the side of the film section (24) opposite the negative mold (25) parallel to the negative mold (25) is arranged displaceably and that the subframe (28) for installation along a closed line or ring surface (16) is formed on the film (24) in the region of the opening of the negative mold (25). 5. Apparatus according to claim 4, characterized by a in the auxiliary frame (28) displaceable pre-stretching die (29). 6. Device according to one of claims 4 or 5 »characterized in that the subframe (28) is slightly in the negative mold (25) protrudes and to rest in the area of the opening (34) of the negative mold (25) with one on his Perimeter lying contact surface (38) is provided, which interacts with the interior of the negative mold (25). 7. Device according to one of claims 4 to 6, characterized in that on the side of the negative mold (25) lying part of the clamping frame (20) has a molding surface (42) for reshaping the neck section (13) follows. 209827/0821 8. Apparatus according to claim 7 »characterized in that that for reshaping by blowing one with the upper part (21) of the clamping frame (20) -cooperating circumferential Sealing shoulder (43) on the subframe (28) is arranged. 9. Container with a container part with a larger and a closure part forming a neck section with a smaller one Wall thickness, * characterized in that the container part (12) with its bottom (14) and the neck portion is made in one piece from thermoplastically deformable material. 10. Container according to claim 9 »characterized in that the container (11) between the container part (12) and the neck portion (13) has an annular surface (16) larger Has material thickness. 11. Container according to one of claims 9 or 10, characterized in that the free end of the HaIsabschnittes (13) a reinforced, laterally protruding ring (18) connects. 12. Container according to one of claims 9 to 11, characterized in that the container (11) is substantially has the shape of a truncated cone. 209827/082 1