DE102006008405B4 - Deep-drawn lid - Google Patents

Abstract

The invention relates to a part of a plastic vessel produced by the deep-drawing process, in particular a lid (1) or container part. In order to further improve a plastic part of the type in question, it is proposed that the cover (1) have a wall (9) formed by back injection molding.

Description

The invention relates to a cover made by thermoforming a plastic container.

Lid of the type in question are known, especially in the household sector, for example, in the food sector in conjunction with plastic containers, which may also be made by deep-drawing.

From the DE 197 33 598 A1 It is known to produce a thin-walled, back-molded plastic molded part by inserting a film in a plastic injection mold, deforming the film in the plastic injection mold and back injection of the thus deformed film in the plastic injection molding tool. The state of the art is still on the DE 195 40 152 A1 , the DE 36 04 925 A1 and the DE 203 20 088 U1 to refer.

Based on the stated prior art, the invention is concerned with the task of specifying a part of a plastic vessel that is advantageously stable or manageable, at least partially made by deep-drawing.

This object is achieved in the subject matter of claim 1, characterized in that the lid has a wall formed by injection molding. According to this embodiment, on the one hand increased stability of the lid in the region of the back-sprayed wall is achieved. Furthermore, a lid produced in this way proves to be advantageous in terms of handleability due to achievable rigidity. A more rigid lid can already be easily removed by being touched on an outer area.

The first deep-drawn lid is made of a plastic material, which is designed in particular in the selected thickness so that a certain inherent stability of the deep-drawn part is reached. Thus, this deep-drawn part is much more stable than a shaped label or the like. This is achieved by a material thickness of the deep-drawn part of more than 0.3 mm. This inherent stability of the deep-drawn part is further increased by the back injection, with soft or even hard plastics being suitable as back-injection material in this regard.

It proves to be further advantageous that the lid is designed for anchoring to the vessel and that a suitable locking lug is made in the plastic injection molding process. Thus, for example, the lid can be designed as a snap lid. It is conceivable in this regard, an embodiment in which the lid is designed as a screw cap, in which case the said locking lug forms a threaded portion. In a preferred embodiment, the back injection is made predominantly in the edge region of the lid, so further preferably in the region which cooperates with the vessel for anchoring. Thus, the cover engages over an associated edge of the vessel due to a U-formation of its edge region, wherein the overlap region is completely back-injected. Accordingly, the entire anchoring portion of the lid, which interacts with an associated edge portion of the plastic vessel, is preferably back-injected with a plastic material. Alternatively, the overreaching area can also be back-injected with respect to an outer leg of the U-training. It is further preferred that the back-injection material is provided only on the inside of the deep-drawn part. Alternatively, the back-injection material may also be applied partially, optionally in a line-shaped manner, on the outside of the deep-drawn part, for example as a result of penetration of the deep-drawn part provided with corresponding perforations with the back-injection material. This can also lead to the formation of a handling edge in a further embodiment.

The thermoforming material and / or the backmolding material is preferably made of polypropylene. Alternatively, the thermoforming material may also consist of polystyrene.

The invention with reference to the accompanying drawings, which illustrates only three embodiments, explained in more detail. It shows:

1 in a perspective bottom view of a lid according to the invention in a first embodiment;

2 the enlarged section along the line II-II in 1 ;

3 in a perspective plan view of a lid in a second embodiment;

4 the section according to the line IV-IV in 3 ;

5 in a further perspective plan view of a lid in a third embodiment and

6 the section according to the line VI-VI in 5 ,

Illustrated and described first with reference to the 1 and 2 a first embodiment of a deep-drawn lid 1 for a plastic container, which may also be made by deep drawing.

The thermoformed deep-drawn part 2 consists of a polypropylene material. This is in plan essentially elongated rectangular formed with rounded corners. In cross-section, the deep-drawn part forms 2 a circumferential, U-shaped edge area 3 from, for anchoring interaction with the assignable edge region of the plastic vessel.

The outer leg 4 the U-training 5 of the edge area 3 has a greater length in cross-section than the inner leg 6 , This inner thigh 6 tense a blanket 7 of the deep-drawn part 2 ,

The downward facing free end of the outer leg 4 carries an outwardly projecting, circumferential edge 8th ,

The deep-drawn part 2 is relatively thin, but with a certain inherent stability. So a material thickness of about 0.3 mm to 0.6 mm is selected.

According to the in the 1 and 2 The embodiment shown is the deep-drawn part 2 circumferential over the entire edge area 3 back-injected inside walls, to form a circumferential wall 9 , The rear injection material 10 covers the entire interior of the U-training 5 that means covering the inner and the outer leg 4 respectively. 6 as well as the cover-side, the two thighs 4 and 6 connecting subway 11 ,

The rear injection material 10 also goes into the between the inner thighs 6 clamped ceiling 7 of the deep-drawn part 2 , this with a measure starting from the inner thigh 6 which is about half the extension length of the inner leg 6 equivalent.

The essentially free-tensioned, Tiefziehteilseitige blanket 7 is back-injected crosswise, according to which the ceiling 7 supporting bars 12 form. At the crossroads of these bridges 12 the injection point, not shown, is selected.

In the vertical direction over the inner thigh 6 protruding portion of the outer leg 4 is inside of the back injection material 10 a catch 13 formed in the course of the back injection. Specifically, this detent nose forms 13 a circumferential, inwardly facing bead, with a corresponding Gegenwulst the plastic container for fixing the lid 1 interacts.

In the 3 and 4 a second embodiment is shown. Here is only the outer leg 4 and an adjoining subsection of the U-web 11 back-molded. The corner area between the U-bridge 11 and outside leg 4 of the deep-drawn part 2 forms a lowered step, at the bottom of which an opening 14 is provided. Through this enters Hinterspritzmaterial 10 to the outside, for the formation of the corner of Hinterspritzmaterial 10 , This may be, for example, a decoration border, which may be made of different shades or materials. Thus, in this regard, a softer material may also be used to create a soft touch.

Next alternatively, according to the representations in the 5 and 6 likewise the outer leg 4 and here the entire U-bridge 11 be injected behind. The inner thigh 6 as well as the ceiling 7 are free of back injection material 10 , In this embodiment, that in the region of the free end of the outer leg 4 shaped edge 8th overmoulded with the back injection material 10 , so that there is also a Softtouchzone, the handling of the lid 1 in particular for the separation of the same from the plastic vessel simplified.

On the essentially free-tensioned ceiling 7 of the deep-drawn part 2 - If necessary, also beyond the peripheral edge region - a label may be applied.

Claims (7)

Thermoformed lid ( 1 ) of a plastic container, characterized in that the lid ( 1 ) a wall formed by injection molding ( 9 ) having. Lid according to claim 1, characterized in that the lid ( 1 ) for anchoring to the vessel and that a suitable latching lug ( 13 ) is produced by plastic injection molding. Lid according to one of the preceding claims, characterized in that the back injection mainly in the edge region of the lid ( 1 ) is made. Lid according to one of the preceding claims, characterized in that the overlap region is completely back-injected. Lid according to one of claims 1 to 3, characterized in that the lid ( 1 ) an associated edge of the vessel due to a U-training ( 5 ) of its edge area ( 3 ) and that the overlapping area only with respect to an external leg ( 4 ) of U-training ( 5 ) is injected behind. Lid according to one of the preceding claims, characterized in that the thermoforming material and / or the Hinterspritzmaterial ( 10 ) consists of polypropylene. Lid according to one of the preceding claims, characterized in that the thermoforming material consists of polystyrene.

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