DE102020103806A1 - Paper lids and processes for their manufacture - Google Patents

Abstract

The invention relates to a cover (D) made of paper and a method for its production, consisting of a cover disc (1) and a cover ring (2) having a longitudinal axis (L2) with a circumferential wall ( 3) with an inner surface (3A) and an outer surface (3B) and a first end (3C) and a second end (3D), with a U-shaped area (1.2) with a first wall section (1.3), and a second wall section (1.4), which are connected to one another via a third wall section (1.5), and wherein the cover ring (2) engages with its first end (3C) in the U-shaped area (1.2) of the cover plate (1) in this way that the first wall section (1.3) rests against the inner surface (3A) and the second wall section (1.4) rests against the outer surface (3B) and that the first wall section (1.3) and the second wall section (1.4) of the U-shaped area (1.2 ) the cover disc with the first end (3c) of the cover ring (2) are firmly connected. According to the method, a pre-drawn conical cover disk (2) is first produced, which has an edge area (4) and a flat area (1.1) offset by a conical shoulder (5) so that a cover ring (2) is positioned on the conical shoulder (5) and that then at least a region of the conical shoulder (5) is formed against an inner surface 3A and the edge region (4) against an outer surface (3B) of the wall (3) of the cover ring (1) and is sealed to it

Description

The invention relates to a cover made of paper and a method for its production according to the preamble of the 1st and 5th claims.

For example the DE 830891 B already discloses two-part paper lids with a first paper element, which represents the circumferential, lateral, largely vertical edge and with a second paper element, which represents an inner horizontally extending cover end and with a third paper element, which is an outer horizontally extending cover end represents.

This structure is relatively expensive and the manufacturing process is complicated.

The object of the invention is to develop a cover made of paper which can be produced simply and inexpensively from two parts with a corresponding method using a device and which has sufficient stability to close a container several times and which can be stacked in one embodiment.

This object is achieved with the features of the 1st and 5th claims.

Advantageous refinements result from the subclaims.

The lid according to the invention consists of paper and / or paper composite and has a lid disc and a lid ring having a longitudinal axis with a circumferential wall extending in the direction of the longitudinal axis with an inner surface and an outer surface and a first end and a second end, the lid disc and the lid ring are cohesively connected to each other and wherein the cover plate has a flat area running transversely to the longitudinal axis, which engages in the cover ring and on its outer circumference a U-shaped area adjoining the flat area with a first wall section and a second wall section that overlap with each other a third wall section are connected, and wherein the cover ring engages with its first end in the U-shaped region of the cover plate such that the first wall section rests against the inner surface and the second wall section rests against the outer surface and that the first wall section and the second wall section of the U-shaped area of the cover disc are connected to the first end of the cover ring in a materially bonded manner.

The wall of the cover ring can be drawn inwards / in the direction of the longitudinal axis in its area that engages in the U-shaped area of the cover disk, so that a shoulder is preferably formed below the cover disk.

To make it stackable, the outer diameter of the cover plate is also smaller than the inner diameter of the wall of the cover ring in the area of the open second end which faces away from the cover ring.

When stacking, the inner diameter of a lid then engages over the outer diameter of a lid located below in the area of the lid disc and the open second end rests on the shoulder of the lid located below.

In the method according to the invention for producing the cover according to the invention, a pre-drawn conical cover disk is first produced, which has an edge area and a flat area offset thereto by a conical shoulder and wherein a cover ring with a first end of its wall on the outer circumference of the conical shoulder or within the conical Heel is positioned and then at least one area of the conical shoulder is formed against an inner surface and the edge area is formed against an outer surface of the wall of the cover ring and connected to it in a materially bonded manner.

The wall of the cover ring can be retracted in the direction of the longitudinal axis of the cover ring to make the cover stackable when it is connected to the cover disk. Alternatively, the wall of the cover ring can be drawn in at a first end in the direction of the longitudinal axis before it is connected to the cover disk. As a further alternative, the wall of the cover ring can also be drawn in at a first end in the direction of the longitudinal axis after it has been connected to the cover disk.

The invention is explained in more detail below using an exemplary embodiment and associated drawings.

• 1 Ausgangsteil für die vorgeformte Deckelscheibe,
• 2 vorgeformte/vorgezogene Deckelscheibe,
• 3 Deckelring,
• 4 auf dem Deckelring positionierte Deckelscheibe,
• 5 aus Deckelscheibe und Deckelring hergestellter stapelbarer Deckel im Längsschnitt,
• 6 Einzelheit X gemäß 5,
• 7 mehrere übereinander gestapelte Deckel gemäß 5,
• 8 Längsschnitt eines nicht stapelbaren Deckels,
• 9 in ein Werkzeug eingelegte Deckelscheibe und Deckelring,
• 10 Werkzeug nach dem Verbinden/Siegeln von Deckelscheibe und Deckelring,
• 11 Variante der Erzeugung des Einzugs am Deckelring vor dem Verbinden mit der Deckelscheibe,
• 12 schematische Darstellung der Herstellung der Verbindung zwischen Deckelscheibe und Deckelring bei einem vorher Erzeugten Einzug am Deckelring,
• 13 dreidimensionale Darstellung eines erfindungsgemäßen Deckels.

Show it:

• 1 Starting part for the pre-formed cover disc,
• 2 preformed / extended cover disc,
• 3 Cover ring,
• 4th cover disk positioned on the cover ring,
• 5 Stackable lid made from lid disc and lid ring in longitudinal section,
• 6th Detail X according to 5 ,
• 7th several lids stacked on top of one another according to 5 ,
• 8th Longitudinal section of a non-stackable lid,
• 9 cover disc and cover ring inserted in a tool,
• 10 Tool after connecting / sealing the cover disc and cover ring,
• 11 Variant of creating the indentation on the cover ring before connecting to the cover disc,
• 12th Schematic representation of the production of the connection between the cover disc and the cover ring with a previously created indentation on the cover ring,
• 13th three-dimensional representation of a lid according to the invention.

1 shows the output part 1' a cover disk, which consists of a flat section of paper or cardboard cut to the shape of the cover. In plan view, the starting part can be round, oval, kidney-shaped or otherwise designed, depending on the desired shape of the lid.

The starting part 1' points at its bottom 1a a coating suitable for producing an integral connection, preferably in the form of a sealing medium, in particular a sealing layer or sealing film, which, however, is not shown here. The sealing medium can, for example, be laminated on, extruded or applied as sealing wax. It consists, for example, of PE (polyethylene).

Between the sealing medium and the underside 1a A barrier layer, not shown here, can be arranged on the cover disk (for example in the form of a ceramic coating or made of aluminum foil, PET (polyethylene terephthalate) or EVOH (ethylene-vinyl alcohol copolymer).

The conically drawn-out cover disc 1 shows in the sectional view 2 . This has an edge area on the outer circumference 4th and one around a conical shoulder 5 offset essentially flat area 1.1 on. This can be flat, as shown here, or also be curved in the direction of the edge or in the opposite direction. Furthermore, the essentially flat area can contain one or more beads (not shown).

The in 3 shown cover ring 2 was preferably made of paper in the winding process and especially spirally wound. The lid ring 2 has a circumferentially closed wall 3 on the course of the lid shape to be produced and thus the lid disc 1 is adapted (e.g. round, oval, kidney-shaped, etc.). The lid ring 2 has a longitudinal axis L2 on and an inside diameter d2 .

The wall 3 has an inner surface 3A and an outer surface 3B as well as a first ending 3C and an opposite second end 3D .

In addition or as an alternative to the cover plate 1 with sealing medium can also the inner surface 3A and / or the outer surface 3B of the cover ring 2 at least in the connection area with the cover plate 1 with sealing medium, as with the cover disc 1 described, provided and optionally also have a barrier layer.

To establish the connection between the cover plate 1 and cover ring 2 becomes the lid ring 1 on the first end 3C the cover sleeve 2 launched (see 4th ). Conical shoulder is advantageously used here 5 for centering the cover sleeve 2 or the cover disc 1 to the cover ring 2 .

The upper area of the wall (not shown) is now used by means of corresponding tools (not shown) 3 the cover sleeve 2 radially inwards towards the longitudinal axis L2 reshaped (indicated by the arrows pointing inwards) and the edge area 4th the cover disc 1 bent downwards (indicated by the arrows pointing downwards). The edge area 4th the cover sleeve 1 to the outer surface 3B and the conical shoulder 5 the cover sleeve 1 to the inner surface 3A the cover sleeve 2 pressed and under pressure and heat the integral connection, in particular by sealing, between the cover plate 1 and cover ring 2 manufactured. The temperature required for sealing is usually between 100 ° C and 350 ° C, depending on the sealing medium, and between 120 ° C and 200 ° C, for example in the case of PE as the sealing medium.

After the deformation and the establishment of the material connection, the cover is D. finished and has the cover disc 1 at the edge a U-shaped area 1.2 on (see 5 and 6th ) in which the wall 3 of the cover ring 2 engages, with the wall 3 on their inner surface 3A and on their outer surface 3B with the U-shaped area 1.2 is firmly connected. The lid D. points in the area of the cover plate 1 a cup-like depression 6.1 with depth t1 and an inside diameter d1 on. In the area of the cover disc 1 indicates the lid D. an outside diameter D1 on.

The wall 3 points to the shoulder 3.1 until the second end 3D an inside diameter d2 on.

According to the detail 6th it can be seen that the is based on the essentially flat area 1.1 subsequent U-shaped area 1.1 an inner first wall section 1.3 (Leg) having the with the inner surface 3A the wall of the lid ring 2 is connected and that a second wall section 1.4 (Leg) with the outer surface 3B the wall 3 of the cover ring 2 is firmly connected (preferably by sealing). The first and second wall sections 1.3 , 1.4 the cover disc 1 and the end in between 3C the wall 3 of the cover ring 2 are essentially parallel to the longitudinal axis L2 of the cover ring 2 aligned with the first and second wall sections 1.3 , 1.4 stretch essentially in a straight line.

The first wall section 1.3 and the second wall section 1.4 of the U-shaped area 1.2 the cover disc 1 are over a third wall section 1.5 connected with each other.

The wall 3 is at the end 3C which is in the U-shaped area 1.2 the cover disc 1 engages, radially inwards / in the direction of the longitudinal axis L2 drawn in, creating below the second wall section 1.4 of the U-shaped area a shoulder 3.1 is formed.

The inside diameter d2 the wall 3 is off the shoulder 3.1 until the second end 3D slightly larger than the outside diameter D1 in the area of the cover disc 1 so that for stacking the inside diameter d2 a lid D. about the outside diameter D1 the cover disc 1 another lid D. can be plugged. The second ending 3D a lid D. then lies on the shoulder 3.1 the other lid D. on.

The wall 3 the cover sleeve 2 points from paragraph 3.1 until the second end 3D an outside diameter D2 on.

In 7th are an example of four lids stacked on top of each other D. shown in longitudinal section. The top lid D. each engages with its inner diameter d2 of the lower area of the cover sleeve 2 about the outside diameter D1 of the second wall section, not designated here, of the U-shaped area and thus the outer diameter D1 the cover disc 1 .

8th shows a lid according to the invention D. which is not stackable. This also has a cover plate 1 with a substantial flat area 1.1 and an externally adjoining U-shaped area 1.1 with an inner first wall section 1.3 (Leg) on, the one with the inner surface 3A the wall 3 of the cover ring 2 is connected and a second wall section 1.4 (Leg), the one with the outer surface 3B the wall 3 of the cover ring 2 is firmly connected (preferably by sealing). The first and second wall sections 1.3 , 1.4 the cover disc 1 and the end in between 3C the wall 3 of the cover ring 2 are here also essentially parallel to the longitudinal axis L2 of the cover ring 2 aligned with the first and second wall sections 1.3 , 1.4 stretch essentially in a straight line. The first wall section 1.3 and the second wall section 1.4 of the U-shaped area 1.2 the cover disc 1 are over a third wall section 1.5 connected with each other. The wall 3 of the cover ring 2 extends over the entire length of the cover ring in a straight line and parallel to the longitudinal axis L2 .

In both design variants - stackable and non-stackable - there is the cover according to the invention D. thus from two parts in the form of a cover disc 1 and cover ring 2 which are cohesively connected to one another. Due to the straight connection areas between the cover plate 1 and cover ring 2 becomes a cover that extends essentially in a straight line D. created.

The method for producing a stackable lid using appropriate tools is explained below by way of example.

First, a pre-drawn conical cover disc is required 2 creates a border area 4th and one around a conical shoulder 5 offset flat area 1.1 having.

The lid ring 2 is according to 9 with its inside diameter d2 on the unspecified outside diameter of a lower tool 6th positioned so that the first end 3C the wall 3 of the cover ring 2 by a length L. over a shoulder pointing radially inward 6.1 of the lower tool 6th protrudes. Now the conical cover ring is pulled forward 1 with the bottom of its edge area 4th on the first end 3C the wall 3 placed and here on the outer circumference of the conical shoulder 5 positioned.

An upper tool 7th now moves down and holds the cover ring 1 by placing it in the radius between the conical shoulder 5 and the flat area 1.1 with a surrounding edge 7.1 against the radially inner end of the shoulder 6.1 of the lower tool 6th fixed. The upper tool 7th has an outside diameter D7 which is the later inner diameter d1 the cover disc 1 of the finished lid D. is equivalent to.

Now a ring stamp is driving 8th from the direction of the upper tool 7th towards the lower tool 6th .

The ring stamp 8th points in the direction of the lower tool 6th an inside diameter 8d2 on that of the outside diameter D2 of the cover ring 2 equals or is slightly larger. The diameter 8d2 closes a bevel pointing radially inwards 8.1 at that are essentially parallel to the shoulder 6.1 of the lower tool 6th runs. An inside diameter connects to the slope 8d1 which is approximately the outer diameter D1 of the finished lid D. in the area of the cover disc 1 is equivalent to. The tool is at least in the area of the joining zone between the cover plate 1 and cover ring 2 heated, but this is not shown.

The end position of the ring punch 8th is in 10 shown. During its lifting movement in the direction of the lower tool, the edge area became 4th the cover disc 1 shaped downwards and against the outer diameter of the cover ring 2 pressed. Through the slope 8.1 and the subsequent smaller inner diameter 8d1 of the ring stamp 8th became the upper area 3c of the lid ring 2 , the adjacent edge area 4th and the conical area 5 the cover disc 2 radially inwards against the outer diameter D7 of the upper tool 7th pressed.

The pressure and the sealing temperature (preferably between 120 ° C. and 300 ° C.) create a material bond between the cover plate 1 and cover ring 2 in the area where the first end is 3C the wall 3 of the cover ring now between the wall areas 1.3 and 1.4 the cover disc 1 is located. The one between the outside diameter D7 and the inside diameter 8d1 The unmarked gap formed is slightly less than the sum of the thicknesses of the wall areas 1.3 , 1.4 the cover disc 2 and the wall in between 3 of the cover ring 2 , whereby the pressure builds up when they are pressed.

After the sealing process has ended, the ring stamp moves 8th up, the lower tool 6th and the upper tool 7th are opened and the lid is ejected by means of an ejector (not shown).

There is also the option of indenting the first end 3C the wall 3 of the cover ring 2 before or after the connection with the cover plate.

This is done, for example, as in 11 indicated by a rolling process of the wall 3 between an outer role 9 (or an outer rail) and an inner pulley 10 . These have a mutually corresponding contour corresponding to the wall indentation to be generated. The advantage here is that with this method, a circumferential bead can also be produced in the wall area of the cover sleeve at the same time, which is present with a large number of covers.

According to 12th then become the border area 4th and the conical area 5 the cover disc 1 also against the radially inwardly shaped area of the wall of the cover ring 2 reshaped and sealed with this.

A stackable lid according to the invention D. is in 13th shown. This is at the top through the cover disc 1 closed the one with the lid ring 2 is firmly connected. The outside diameter D1 in the area of the cover disc 1 is smaller than the outside diameter D2 in the area of the cover ring 2 , creating a paragraph 3.1 is formed.

The inside diameter of the lid, not designated here D. reaches for stacking over the outside diameter D1 .

List of reference symbols

1'

Output part

1a

bottom

1

Cover disk

1.1

flat area

1.2

U-shaped area

1.3

first wall section

1.4

second wall section

1.5

third wall section

1.6

deepening

2

Cover ring

3

Wall

3A

Inner surface

3B

Exterior surface

3C

first end

3D

second end

3.1

shoulder

4th

Edge area

5

conical shoulder cover ring

6th

Lower tool

6.1

Shoulder lower tool

7th

Upper tool

7.1

circumferential edge

8th

Ring stamp

8.1

Slant

8d1

Inner diameter ring stamp

8d2

Inner diameter ring stamp

9

outer role

10

inner role

d1

Inside diameter cover disk

d2

Inner diameter cover ring / wall

t1

depth

D.

lid

D1

Outside diameter of the cover disc

D7

Outside diameter of the upper tool

L.

length

L2

Longitudinal axis

QUOTES INCLUDED IN THE DESCRIPTION

This list of the documents listed by the applicant was generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Patent literature cited

• DE 830891 B [0002]

Claims (6)

Cover (D) made of paper, consisting of a cover disc (1) and a cover ring (2) having a longitudinal axis (L2) with a circumferential wall (3) extending in the direction of the longitudinal axis (L2) with an inner surface (3A) and a Outer surface (3B) as well as a first end (3C) and a second end (3D), wherein the cover plate (1) and cover ring (2) are materially connected to one another, characterized in that - the cover plate (1) has a transverse to the longitudinal axis (L2 ) extending flat area (1.1), and - on its outer circumference a U-shaped area (1.2) adjoining the flat area with a first wall section (1.3) and a second wall section (1.4), which are connected to one another via a third wall section (1.5) are connected, and - wherein the cover ring (2) engages with its first end (3C) in the U-shaped area (1.2) of the cover plate (1) in such a way that the first wall section (1.3) on the inner surface ( 3A) and the second wan d section (1.4) rests on the outer surface (3B) and that the first wall section (1.3) and the second wall section (1.4) of the U-shaped area (1.2) of the cover disc are connected to the first end (3c) of the cover ring (2) in a materially bonded manner are. Cover after Claim 1 , characterized in that the wall (3) in its area which engages in the U-shaped area (1.2) of the cover plate (1) is drawn inwards / in the direction of the longitudinal axis (L2) and thus a shoulder below the cover plate (3.1) is formed. Cover after Claim 1 or 2 , characterized in that the outside diameter (D1) of the cover disk (1) is smaller than the inside diameter (d3) of the wall (3) of the cover ring (2) in the region of the second end 3D. Lid according to one of the Claims 1 until 3 , characterized in that it is stackable, the inner diameter (d3) of a lid (D) reaching over the outer diameter (D1) of a lid (D) below and the second end (3C) on the shoulder (3.1) of the one below Lid (D) rests. Process for the production of a lid (D) according to Claim 1 , characterized in that first a pre-drawn conical cover disc (2) is produced, which has an edge area (4) and a flat area (1.1) offset thereto by a conical shoulder (5), that a cover ring (2) with a first end (3C) a wall (3) on the outer circumference of the conical shoulder (5) or within the conical shoulder (5) is positioned and that then at least one area of the conical shoulder (5) against an inner surface 3A and the edge area (4) against a Outer surface (3B) of the wall (3) of the cover ring (1) are formed and sealed with this. Procedure according to Claim 5 , characterized in that the wall (3) of the cover ring (1) is drawn in when connecting to the cover disc (2) in the direction of the longitudinal axis (A) of the cover ring (1) or that the wall of the cover ring (1) before or after the connection with the cover plate (2) is drawn in at a first end (3c) in the direction of the longitudinal axis (A).

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