JPH03151230A - Method for manufacturing a container equipped with a connecting member and its device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention is defined in the first part of claim 1,
The present invention relates to a method for manufacturing a flexible thin-walled container having at least one geometrically stable connecting member, and to an apparatus for carrying out this method.

[Conventional technology]

Flexible plastic containers with a stable connection (A) in the form of, for example, filling and/or discharge pipes, or integral tandem sets with built-in filling and/or discharge pipes have also been used for some time. They are also well known as so-called liquid fillers.The above-mentioned known types of containers are formed in various geometric shapes.

With regard to manufacturing methods, the prior art distinguishes between so-called flat foil containers and containers made of deformed foil material. In this case, the latter method starts from flat foils, as in the so-called vacuum deep-drawing process, or from foil-boss materials, as in the injection molding process.

In order to fill with liquid or at least flowing or sprayed media and/or to remove these media, known containers have so-called connecting elements. The internal space and external space of the container are, so to speak, communicated through this member.

In the case of the above-mentioned flat claw-file containers, the connecting member is welded flat to the foil halves after the container has been made. In the case of a three-dimensionally deformable container made from a shaped membrane, the connecting member is fixed in shape and force into one opening of the shaped container.

5. What is common to this known container is therefore that the connection of the individual connecting members to the container takes place after the container has been produced, independently of the design of the container itself.

This means that the attachment of the connecting element always takes place after the foil has been shaped and welded in a separate assembly step.

In connection with the injection molding method, it is already known that the connecting member is positioned in the injection nozzle at the separating surface of the molding tool and melted onto the foil by the internal pressure of the molding tool in the manner of pressure welding.

However, since this method can only be used in discontinuous operation of the machine, the cycle time is quite high. Furthermore, it cannot be said that there are no problems in the production of crystals using this method.

In connection with the vacuum deep-drawing method described above, despite this economical advantage and the morphological advantages due to the thin walls of the container, it is currently not possible to connect the connecting member to the foil material immediately after extrusion. has been ignored until now. A particular problem in this case is that when the deep-drawn half-mold is finally closed, the flat foil tape is also immediately welded and adhered to the connecting part due to the hot lid on the foil. Because it is attached,
It is known that defective products are produced. This problem of adhesion or welding also applies to the surface of the device between the foil tape and the deep-drawing die.

[Problem of invention]

The problem underlying this invention is that the connecting member can be positioned and welded almost simultaneously when the container halves are welded to the separating surfaces of the container halves, and the deep drawing molds can be aligned. -! 2) A method of design that ensures that the foil material surrounding the connecting member is cooled before opening the deep-drawing mold, so that this foil material does not "stick" to the connecting member or the deep-drawing mold. It is to serve as an apprentice.

Furthermore, it is an object of the invention to provide a device for carrying out the method described in f.

[Means to solve problems]

The above-mentioned problem can be solved by the present invention at the beginning (in the case of the method described above, before the deep-drawing mold is joined between the flat foil tapes, the connection is made relative to the deep-drawing mold). When positioning the parts and closing this deep drawing mold, welding is carried out around the flat foil tape and the connecting member is welded to this flat foil tape, so that the foil material is connected As long as it cools around the part in a stable manner,
This is achieved in that the part of the connecting part which projects outwardly with respect to the container is free for the deep drawing die.

Furthermore, the above-mentioned problem can be solved according to the present invention, in the case of the device mentioned at the beginning, it is equipped with a device for positioning the connecting member which is controlled in synchronization with the manufacturing cycle, and this device is capable of positioning the connecting member. This is solved by positioning the tape between the tabs, which are received from the magazine on the one hand and which are flat against the deep drawing die on the other hand.

Furthermore, according to claim 3, since the deep drawing die has a complementary undercut depending on the position and size of the connecting member, when the deep drawing die is closed with a flat membrane tape, , the connecting members only touch at the weld seam, and the remaining parts are free.

According to claim 4, when the halves of the mold are brought together, a deep drawing mold can be formed such that a circular bulge is formed surrounding the container on one side and the connecting member on the other. In that case, the container halves with the connecting member are separated from the bulge by a separating edge, and the separating edge from the flat membrane tape by a bushing edge.

[Action and effect]

A feature of this method is that a guiding or positioning device is provided between the two fuzu, ilt ranks.
The advantage of this device is that the connecting element can be precisely positioned relative to the deep-drawing mold and thus relative to the finished container. When fitting a deep-drawing split mold connected to a vacuum conduit, two half-containers are formed, and when the deep-drawing mold is (finally) closed, the heat present in the foil welds the half-containers together. , and welding the half-container to the connecting member on which it is placed or introduced. By arranging the connecting member in the separating plane, a similar welding force is always exerted between the foil and the current connecting member6. ″.

In addition, the undercuts ensure that the foil material cools in a stable state before opening the deep drawing mold, and that the foil does not suffer from problematic (“peeling”) when the mold is opened.

[Example] The method according to the invention and the device for carrying out the method will be explained in more detail below with reference to the drawings.

The starting point for this method and device is an extruder (not shown) in which the molten synthetic material is injected via a double inlet into two separate foil tapes 1.2 (German Patent No. 35
No. 13399 Mei 1l-J'.2).

These double-port openings are spaced apart from each other.
Therefore, the claws and illuminations 11 and 2 are also pushed out at a distance from each other.

These foil tapes 1.2 are then drawn along their lateral longitudinal edges 11,' by means of a tensioning mechanism at intervals appropriate to the extruder. Finally, the work container 3 is separated from the rest of the foil tape. The extrusion direction of the foil tapes 1 and 2 is marked with a symbol X.

The original functional components of this method and device are two split types 4,
It is a deep drawing type consisting of 5 parts. In this mold a container 3 is formed. In the split mold 4.5 there are in each case - cavities 6, 7 indicated by dotted lines. This cavity is evacuated from the column.

The part of the foil tape 1 or 2 immediately preceding the cavity 6 or 7 of the corresponding mold 4.5 is drawn into this cavity 6, 7 and formed into a half container. The split molds 4.5 are pressed together at the same time so that the still plastic material of the foil tapes 1, 2 is thoroughly melted around the cavities 6, 7 and along the edges.
,,'・54'ru.

4. Container to be molded; after a cooling time according to the material in 3, the mold is opened again 1, the closed container 3 is finally separated from the supporting foil 1.2 and the remaining foil tape used [ru.

The profitable manufacturing process will be explained based on process I-■ in FIG.

In step I 5, the split mold 4.5 is in the discharge position, the so-called butt position, under the extruder. These split types 4.5
are open, and the foil tapes 1, 2 are passed between them at a predetermined extrusion speed (9'').

Both split molds 4.5 have semicircular undercuts 1-8, 9, one each on the side opposite the foil tape 1. The short radius of these undercuts) 8.9 corresponds to the diameter of the round connecting member. The long radius of 8° 9 (undercuff) forms a free space 10° 11 between the short radius adjoining the cavities 6, 7 and the outside of the split molds 4, 5. This free space is intended to prevent the foil material from being installed around the introduced welding or welded connecting parts and to allow for the intended cooling of the foil material. used only. According to the drawing in step (2), when the split molds 4, 5 are opened, a connecting member 13 is introduced between the foil tapes 1, 2 spaced apart by a manual positioning device 12.

This positioning device 12 receives the connecting element 13 from the corresponding magazine via a holding pawl and guides this element into the correct position between the foil tapes 1, 2 and thus between the split molds 4.5.

According to step (2), the cavities 6.7 of the split molds 4, 5 are now deformed, and the foil tapes 1, 2 are deformed (see references B and 2'). These tapes then end up flat against the walls of the cavity 6.7.

At the same time, these split molds 4.5 come together and finally (see step ①) the deep drawing mold is closed as a whole and the finished container 3 is confined in the mating cavity 6.7. When the split molds 4, 5 are closed, the connecting member 13 is correctly positioned and this member is pressed against the short radius of the undercuts 8.9 when they come together and is welded. In this way, the container 3 with the welded connecting member 13 is completed in an integrated working process. In that case, the connecting member 13 protruding from the container 3
A portion of the foil tape is free and the adjacent foil tape cools down or cools to a stable shape.

In step (2), the deep drawing mold opens, that is, the divided molds 4° and 5 separate from each other. Since the foil material adjacent to the connecting member is sufficiently stable in shape, this separation can be carried out without problems. The container 3 hangs in a grid of continuously flowing foil edges and moves away from the deep drawing mold. On the other hand, the mold is returned (see German Patent No. 3,513,399).

According to the drawing in step (2), the finished container 3, now fitted with a connecting member and cooled, is separated from the support foil 14.

FIG. 2 shows the production of the container in a cross-section corresponding to the deep-drawing mold and thus to the separation plane of the divided container.

Foil tapes 1, 2 of width A are injected from the double nozzle 20 of the extruder shown and introduced into a deep drawing mold. Here, foil tape l.

2 has a foil width B.

In the case of the embodiment shown in FIG. 2, the deep drawing die is composed of two dies connected to each other, so that two containers 3 are formed in any work process. 5 moves perpendicular to the paper in this case.

According to the drawing in FIG. 1, the split mold 4.5, which receives in each case one connecting element 13, has a conical dome-shaped undercut as a free space 10.11. This undercut is formed by the connecting member 13 in the region where it transitions into the cavities 6, 7.
A circular welding web (small diameter undercut 8) corresponding to the diameter of is formed, which is shaped in such a way that it spreads out in a tulip-like manner (long diameter undercut 9) towards the outside of the split mold 4.5. When the split molds 4.5 come together, said free spaces 10.11 are formed, which spaces are filled with foil tapes 1 which are introduced into the mold for deep drawing while keeping a distance from each other.
, 2 to allow the child to cool. A foam-like protective filling forms around the connecting element.

The guide of the connecting member 13 is the same as in the drawing of FIG.
This is done by the positioning device 12. According to the arrangement shown, this device receives two connecting members 13 from two magazines 21, 22 at the same time and positions them in corresponding positions between the split molds 4.5. The positioning device 12 allows the connection member 13 to be attached to the split mold 4 each time the split mold is closed.
, 5, can be adjusted in height and lateral direction, and can be controlled in time.

In the drawing of FIG. 2, a further method step for the production of a container is shown in that the finished container is removed or withdrawn from the extruder via a withdrawal device 11!23.24. The drawing device engages with the remaining edges of the foil tapes 1, 2 against both sides of the pair of containers and draws this tape out. When the split molds 4, 5 are opened again after producing the container, the container 3 is removed from the deep drawing mold and finally separated from the part used as support grid by the unformed part of the foil tape 12.

To replenish the material, the split mold 4.5 also has a recess 25 on its underside, which is aligned with the position of the connecting piece 13, as shown in FIG. Therefore, the interval between successively produced containers can be kept shortest until the container 3 with the connecting member 13 removed from the finished mold is approximately inserted into the mold to form the next container when the mold is closed.

Regarding the guide device of the connection vj' l 3, as shown, this device can be arranged in the area under the double mouth of the extruder, ie the nozzle. In that case, the connecting member 13
The positioning device 12 can be moved in and out for receiving and guiding the device. In this respect, a solution is also conceivable in which the positioning device is arranged in the molding direction of the split mold and is formed as an extension of the magazine of the rectilinear extruder.

Based on the exemplary embodiment shown schematically, a split undercut or free space was used for the form-stable cooling of the foil tape adjacent to the connecting element. The above object can be achieved by improving the split mold by equipping the cavity which ultimately forms the container with a second circulating cavity forming a bulge which surrounds and protects the connecting part of the container. In this case, the area between the container and its bulge is separated by a separating edge, and a pressure rim is formed at the transition from the bulge to the remaining nail tape.

[Brief explanation of the drawing]

Figure 1: Six steps in container manufacturing, viewed perpendicular to the extrusion direction of the foil tape! =-V [1. Passing between the deep-drawing molds] Deep-drawing mold in open state with A-il tape; ■8 Deep drawing mold in open state with positioned connecting member. ■. Closed deep drawing mold with formed foil tape. IV, deep drawing mold in closed position with fixed connecting member. ■, Deep drawing mold in open position again with finishing container. ■ Finished container separated from supporting foil. FIG. 2 is a plan view perpendicular to the extrusion molding direction V and illustrating the principle of the container manufacturing method within the separation plane of the split mold of the deep drawing mold. Reference symbols in the figure: 1.2...Foil tape, 3...Container, 4.5...Divided type, 6.7...Cavity, 8.9...Undercut, 10.11. ...Free space, 12.. Positioning device, 13.. Connection member, 14.. Support foil, 21.22.. Magazine, 23.24.. Drawer mechanism, 25.. Notch.

Claims (1)

[Claims] 1. A container is formed by vacuum deep drawing from two flat foil tapes of thermoplastic synthetic material that are sequentially pressed from an extruder in a multi-component deep drawing mold. The deep-drawn molds are then welded together to form a ring, which is flexible and has at least one dimensionally stable connecting member for filling the container with a liquid or fluid medium or for excluding this medium. In a method for making walled containers, before the deep-drawing form is fitted between the flat foil tapes, the connecting member is positioned relative to the deep-drawing form, and when the deep-drawing form is closed. , welding around a flat foil tape and welding a connecting member to this flat foil tape is carried out, and as long as the foil material cools shape-stablely around the connecting member, it will not be external to the container. A method characterized in that the portion of the connecting member that projects in the direction is free with respect to the deep drawing die. 2. An apparatus for carrying out the method according to claim 1, which is equipped with a device for positioning the connecting elements controlled synchronously with the production cycle, which device receives the connecting elements from the magazine on the one hand and positions them on the other side. A device characterized in that it is positioned between a flat foil tape against a deep drawing die. 3. The deep drawing mold has a complementary undercut according to the position and size of the connecting part, and when the deep drawing mold is closed, the connecting part contacts at the welding seam with a flat foil tape, Claim 2 characterized in that the remainder is free.
The device described. 4. The deep-drawing mold is formed so that when the split molds are put together, a circular bulge is formed surrounding the container on one side and the connecting member on the other, and the half container with the connecting member is formed against the bulge. 3. Device according to claim 2, characterized in that it is separated by a separating edge and said separating edge is separated from the flat foil tape by a pressure edge.