DE102011120657A1 - Method for partially recycling base material of optically readable information carrier e.g. compact disk, involves turning information carrier from front side to back side to subsequently remove base material on back side - Google Patents

Abstract

The method involves preparing optically readable information carrier, and removing the base material from front side of optically readable information carrier. The information carrier is turned from front side to back side in order to subsequently remove base material on the back side. The knife (10) is arranged with respect to blank holders (11,12) mounted for preventing lifting of the compact disk (32) from the retainer (6). The width of knife is larger or equal to the diameter of the information carrier. An independent claim is included for device for partially recycling base material of optically readable information carrier.

Description

The invention relates to a method for the at least partial recycling of material of a plate-shaped information carrier, with mechanical removal of material of a plate-shaped information carrier, in particular an optically readable information carrier, and a related method.

From the prior art, a variety of methods for the mechanical removal of material of a plate-shaped information carrier, in particular an optically readable information carrier, in particular for CDs, known in which mechanical and chemical treatment steps, the components or the individual layers of such information carriers separated from each other and be worked up.

In particular from DE 4123199 C2 discloses a method for mechanically removing foreign matter from the base material of a disc-shaped information carrier, for recovering the base material, wherein the coating containing the impurity of the base material by a cutting, parallel to the surface of the information carrier guided cut removed with a thickness at least the thickness of the coating having cutting depth becomes. A disadvantage of this method, however, is the fact that a commercially viable application for DVDs is not apparent, since in DVDs, the two existing information layers in the middle of the sound carrier are adhesively bonded together in layers.

The problem underlying the invention is therefore to provide a method for the mechanical removal of material of a plate-shaped information carrier, in particular an optically readable information carrier, also and especially for DVDs, which is economically useful for a variety of differently structured information carriers, for example and especially DVDs.

This problem is solved according to the invention by a method according to claim 1 and an apparatus according to claim 9.

In the method according to the invention for the at least partial recycling of material of a plate-shaped information carrier, material of a plate-shaped information carrier is mechanically obtained therefrom, for example and in particular by means of an abrasive-chipping knife, whereby material of the information carrier is first removed from one side of the information carrier and subsequently removed by a second, the first side opposite side of the information carrier abspanendes material of the information carrier is obtained. In this way, material of the information carrier is selectively obtained from the two sides of the plate-shaped information carrier and supplied depending on the composition of a recycling, namely with pure carrier material, in particular polycarbonate, which provided with foreign substances layers, for example and in particular label layers of the information carrier, not one Recycling but usually these are then briquetted and then burned, for example, and in particular as fuel for technical processes or to melt by means of chipping won polycarbonate for further processing in a recycling process.

Thus, it is possible according to the invention that, depending on the structure of the plate-shaped information carrier, the individual layers are removed by scavenging and fed either a recycling or other uses.

In this context, it is further according to the invention that the information carrier is turned after the stock removal on the first side to subsequently abzuspanen material on the second side, in particular information carrier with a thickness of the plate-shaped information carrier arranged middle layer or more middle layers, for example in a DVD two information layers, which are connected to an adhesive layer, can be processed and thus in this way as much support material, for example, and in particular polycarbonate win.

Furthermore, it is advantageous if a coating containing at least one foreign substance is removed from a carrier material by a cutting cut parallel to the surface of the information carrier with a cutting depth having at least the thickness of the coating, since the layer containing at least one foreign substance is cut by a cut a defined depth of cut is removed, wherein the section over the entire width of the Informatinträgers may advantageously extend, so that with a single pulling cut the at least one foreign substance-containing coating is peeled off from the carrier material.

The liberated from the at least one foreign substance plate (ie the information carrier) from the carrier material is usually available in a relatively pure form with a relatively high surface quality, which can be further increased by advantageously at least the at least one foreign substance having side of the information carrier before the cut moistened, wherein the moistening is assisted by the fact that the information carrier is pressed during its section from its containing the at least one foreign substance side in a receptacle for fixing the position. The receptacle formed by a recess preferably has a diameter which corresponds to the outer diameter of the plate-shaped information carrier. By pressing the information carrier in the recording a secure positioning of the information carrier is achieved during the cut.

Preferably, a cutting angle of plus / minus 10 degrees is used. In particular, when using a negative cutting angle, a high surface quality of the remaining carrier material can be achieved.

The information carrier is preferably held in the receptacle in addition to one side, in particular the underside, attacking suckers.

Advantageously, the depth of abrasion - when using a knife, the depth of cut - set such that the depth of cut exceeds the thickness of the at least one foreign substance containing layer slightly, so that a thin surface layer of the substrate is also removed, which is advantageous because the security increases is that only remains underneath pure carrier material and recycled can be recycled.

Likewise, it is of course possible that the depth of abrasion or depth of cut is advantageously adjusted so that the thickness of a pure carrier material-containing layer falls slightly below, so that a thin surface layer of the carrier material remains to advantageously increase the security that actually only pure carrier material has been removed abrasive.

According to the invention, the abrasive element may be one of the group of knives or abrasive disc, wherein the abrasive disc is ultimately a disc-shaped element having a rough surface and possibly provided with abrasion elements in the form of protrusions on the surface, in particular by a rotating but also translatory or pivoting movement Material of the plate-shaped information carrier abrasive abschälend to remove.

Due to the twist of the information carrier according to the invention, depending on the stratified structure of the information carrier with respect to at least one impurity-containing layer or pure carrier material-containing layer, only the layers are removed abrasive only to ultimately obtain as few steps as possible, either a plate-shaped information carrier, the either contains only pure carrier material, so that this remainder can then be fed directly to further recycling, or for the most part only has at least one foreign substance and hardly any carrier material, so that then this remainder can also be fed directly to a further non-recycled further processing, For example, and in particular after a certain comminution can be fired for other or further process steps.

In this context, it is advantageous if the turn of the information carrier is realized by means of a turning unit, wherein this is advantageously a vacuum pad, which in turn is advantageously rotatable or rotated during operation, so that a secure and reproducible turn of the information carrier can be accomplished. Furthermore, it is advantageous in this context if the turning unit has a disk-like means which has at least one slot for receiving a plate-shaped information carrier.

In the context of the method according to the invention, it is advantageous for DVDs as information carrier after abspanendem removing a label layer and at least a portion of an underlying first substrate layer on the first side of the information carrier is turned to thereafter at least a part of a on the first side abzuspanen arranged opposite second side substrate layer. In this way, the label layer, the underlying carrier material layer and arranged on the other side second carrier material layer is removed abrasive, in which case the remainder, which consists of a part of carrier material and predominantly of the two information layers together with plastic adhesive, are fed to further processing can, so that in a relatively efficient manner, a separation of carrier material and the rest is realized.

In this context, it is also advantageous if, in the case of DVDs, the information carrier is removed after removal of at least a portion of a second side opposite the first side and then at least after removal of a label layer arranged on a first carrier material layer remove a portion of the first substrate layer abspanend.

Furthermore, it is advantageous if in Bluray discs as information carrier after abspanendem Removing a arranged on the first side label layer of the information carrier is reversed, to subsequently remove a disposed on the opposite side of the first page second information layer abspanend or remove at Bluray discs after abspanendem removal of the opposite side on the first side second information layer the information carrier is turned to remove abspanend subsequently arranged on the first side label layer to hold in these two ways and a high process economy in the hands, since in both ways a relatively broad substrate layer is left, then another Recycling can be supplied.

Finally, it is advantageous if, in the case of label-layer-free DVDs as an information carrier, the information carrier is removed after removing at least a portion of a first carrier material layer on the first side in order to subsequently remove at least part of a carrier material layer arranged on the second side from the first side Also in this way as with the label-containing DVDs from both sides carrier material can be obtained in an efficient manner.

The object underlying the invention is further achieved by a device for carrying out the method according to the invention, comprising a tool lower part of a receptacle for fixing the plate-shaped information carrier, a relative to the tool lower part substantially parallel to the surface slidable upper tool with at least one layer of the surface of the plate-shaped Information carrier abschälenden Abrasionselement from the group knives, Abrasionsscheibe. The abrasive element advantageously has a width which is greater than or equal to the diameter of the plate-shaped information carrier, so that a layer to be abraded can generally be removed with a cut.

For turning the plate-shaped information carrier to be processed, it is according to the invention, when the device according to the invention comprises a turning unit for turning the information carrier, in particular if it is a vacuum pad in the turning unit, in particular if the turning unit is rotatable or is rotated during operation to this way to provide a secure preparation for the processing of both sides of the disc-shaped information carrier.

In a structurally preferred embodiment of the device according to the invention, a hold-down guided on the surface of the plate-shaped information carrier is provided, which is arranged in front of the knife in the cutting direction, the hold-down being supplemented by an additional hold-down trailing the knife. The hold-down device, in particular the leading hold-down device, preferably has the width of the knife and can be formed with such a length that it can rest on the information carrier practically over the whole area.

It may be advantageous to lower the arrangement of blank holder and knife before moving in the cutting direction perpendicular to the surface of the information carrier on this surface / to allow a convenient loading of the recording with the plate-shaped information carriers. The cutting edge of the knife relative to the hold-down a defined, the depth of cut determining board, this arrangement has the advantage that different thicknesses of the optical information carrier, which are often due to different thicknesses of the carrier material, while the thicknesses of the at least one foreign substance containing layer is usually the same (except tolerances), automatically compensated. It is altemativ but also advantageously possible to work with a constant Abrasions- or cutting depth, which is set relative to the tool base, wherein the Abrasions- or cutting depth is set so that the at least one foreign substance-containing coating at the minimum thickness of Carrier material is peeled off within the established tolerance width. For thicker carrier materials, a corresponding layer of the carrier material is peeled off in this case.

Furthermore, it is advantageous if the depth of the receptacle (in the tool lower part) is smaller than the minimum thickness of the information carrier reduced by the depth of cut, since this ensures that the cutting edge of the knife securely moves at a distance from the upper side of the tool lower part parallel to this upper side can be made without the risk of contact between knife and tool lower part.

For sucking fixation of the plate-shaped information carrier in the receptacle, at least one vacuum line may be formed in the lower tool part, which opens into the bottom of the receptacle.

A further fixing of the plate-shaped information carrier can be achieved by advantageously projecting a central centering pin of the receptacle into a central opening of the inserted plate-shaped information carrier.

Preferred cutting angles are + 4 ° to + 8 ° or -4 ° to -8 °. In experimental arrangements, the best results have been achieved with cutting angles of + 4 ° to + 6 ° and -4 ° to -6 °.

The invention will be explained in more detail below with reference to exemplary embodiments illustrated in the figures. Show it:

1 - A vertical section through an arrangement of tool upper part and lower tool part with an inserted plate-shaped information carrier;

2 - a detail A from 1 ;

3 - A schematic plan view of the arrangement according to 1 with indication of two working positions;

4 A schematic representation of the cutting conditions for the knife moved over the information carrier;

5 A schematic representation of a negative cutting angle;

6 - Layer structure of a compact disc;

7 A schematic cross-sectional view of a compact disc;

8th A schematic cross-sectional view of the layer structure of a Bluray disc;

9 A schematic cross-sectional view of the layer structure of a DVD;

10 - A schematic and perspective view of a turning unit.

1 leaves a tool part 7 recognize, in which a recording 6 is in the form of a round recess into which a plate-shaped information carrier 32 is inserted in the form of a compact disc. For centering serves a centric centering pin 13 the recording, in a middle opening of the compact disc 32 partially protruding. In the field of recording 6 has the lower tool part 7 vacuum lines 34 on, in which a negative pressure is producible, so that the Compact Disc 32 to the bottom of the picture 6 is sucked. The suction pipes entering the floor 34 are concentric around the center bolt 13 arranged around. It can 6 . 8th or several such suction lines may be provided.

1 also leaves a tool shell 8th recognize in his working position, in the one on the upper tool 8th attached knife 10 from the top of the compact disc 32 a layer 36 removing by cutting. This in 1 from right to left guided knife 10 gets behind a front hold-down 11 and in front of a trailing hold-down 12 guided. The hold down 11 . 12 prevent lifting the compact disc 32 from the recording 31 ,

2 indicates that the depth of cut S from a fixed difference of the bottom of the front holddown 11 and the depth of a front cutting edge 38 of the knife 10 results. The depth of cut S thus also determines the thickness of the through the knife 10 peeled layer 36 from the base / carrier material 4 the compact disc 32 ,

3 clarifies that the tool top 8th with the knife 10 and the two downers 11 . 12 from an in 3 A beginning position parallel to the top of the lower tool part 7 is performed in the cutting direction X, where in 3 a working position B is shown, in which the knife 10 in the cutting direction just behind the middle of the compact disc 32 located.

For holding down the compact disc 32 in the recording 31 is the leading hold-down 11 of greater importance than the trailing hold-down 12 ,

4 illustrates a shape of the knife 10 , above a front cutting edge in the cutting direction in front of a chip receiving chamber 70 having. As cutting angle α1. of the knife 10 becomes the angle between the perpendicular to the surface of the compact disc 32 and the inclination 37 the leading edge of the cutting edge 38 designated. The angle γ between the bottom of the tool and the top of the tool base 7 is called the clearance angle.

Cutting angles between + 10 ° and -10 ° have proven to be advantageous. 4 shows exaggerated representation of a positive cutting angle α1, while 5 illustrates a negative cutting angle -α2, which corresponds to a shaving process.

The formation of a negative cutting angle -α2 has advantages for the surface quality of the remaining base material 4 ,

6 illustrates the usual structure of a compact disc 32 that has a scan page 39 on the side of the substrate 4 and an opposite printed surface 40 comprising, - starting from the carrier material 4 - through a metal layer 41 , a varnish layer 42 - both the information layer 43 . 17a forming - and a color print 16 is formed for the label.

6 indicates that the depth of cut S is set so that all layers 41 . 42 . 16 be safely removed and that a thin layer of the support material 4 is peeled off to retain a well usable pure carrier material.

In 7 is a bit different compared to 6 the layer structure of a compact disc shown, with from top to bottom first a label layer 16 , then an information layer 17a and then a substrate layer 17 . 18 can be seen in the form of polycarbonate.

In comparison, a Bluray disc is constructed by the following label layer order 16 - Polycarbonate substrate layer 17 . 18 - Information layer 19 or with a DVD (s. 9 ) Label layer 16 - First substrate layer 17 - first information layer 17a - adhesive resin layer 50 - second information layer 19 - Second carrier material layer 18 ,

According to the invention, both the Bluray discs and the DVDs are rotated in the course of processing to either the Bluray disc label layer 16 and information layer 19 Remove on both sides, and then the relatively thick substrate layer 17 . 18 to recycle from polycarbonate or a DVD after removing a label layer 16 a first substrate layer 17 to recycle this material, after turning the DVD, the second substrate polycarbonate layer 18 and also to recycle this material, while the remaining layers, namely the two information layers 17a . 19 and the adhesive resin layer 50 , both information layers 17a . 19 connects to each other, for example, and in particular a further utilization in the form of briquetting and combustion are supplied.

In 10 is a perspective and schematic view of a turning unit 14 to recognize, by means of two, parallel to each other running conveyor belts 60 . 61 Already on their first pages abrasive processed information carrier 62 be supplied to a disc-like means 14a that over single slots 15 picking up the information carrier to be used, then turning it around after about one turn of about 180 degrees on the two treadmills 60 . 61 so that they then transport the respective information carrier for further abrasive processing. The device according to the invention can have only one abrasion device or else two or more abrasion devices, depending on the intended use.

LIST OF REFERENCE NUMBERS

1

first page of the information carrier

2

second page of the information carrier

3

coating

4

support material

5

first surface of the plate-shaped information carrier

B

Width / diameter of the plate-shaped information carrier α1-α2 cutting angle

6

admission

7

Tool part

8th

Upper die

9

second surface of the disc-shaped information carrier

10

abrasive member

11

in front of the knife running hold-down

12

after the knife running holddown

13

centering

14

turning unit

14a

disc-type agent

15

slot

16

label layer

17

On the first side of the information carrier arranged carrier material layer

17a

Information layer arranged on the first side of the information carrier

18

on the second side of the information carrier arranged carrier material layer

19

on the second page arranged information layer

31

admission

32

compact disc

34

vacuum lines

35

central kingpin

36

layer

37

Inclination of the leading edge

38

cutting edge

39

scanning side

40

opposite to the scanning side surface

41

metal layer

42

paint layer

43

information layer

50

Adhesive resin layer

60, 61

Treadmills

62

information carrier

70

Clamping receiving chamber

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been 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.

Cited patent literature

• DE 4123199 C2 [0003]

Claims (31)

Method for at least partially recycling material of a plate-shaped information carrier, with mechanical removal of material of a plate-shaped information carrier, in particular of an optically readable information carrier, wherein at first from a first side ( 1 ) of the information carrier abspanend material of the information carrier is obtained and then from a second ( 2 ), the first page ( 1 ) opposite side of the information carrier abspanend material of the information carrier is obtained, characterized in that the information carrier after the Materialabspanen on the first side ( 1 ) is turned to then abzuspanen material on the second side ( 2 ). Method according to claims 1, characterized in that a coating containing at least one foreign substance ( 3 ) of a carrier material ( 4 ) by a cutting, parallel to the surface ( 5 ) of the information carrier guided with at least the thickness of the coating ( 3 ) having cutting depth is removed. A method according to claim 2, characterized in that the section extends over the entire width (B) of the plate-shaped information carrier. A method according to claim 2 or 3, characterized in that the at least one foreign substance having side of the information carrier is moistened before the cut. Method according to one of claims 2 to 4, characterized in that the plate-shaped information carrier during the cut of its constructed with the at least one foreign substance side ( 1 ) into a receptacle ( 6 ) is pressed to fix the position. Method according to one of claims 2 to 5, characterized in that a cutting angle (α1, -α2) of + 10 ° is used. Method according to Claim 6, characterized by the use of a negative cutting angle (-α2). Method according to one of claims 2 to 7, characterized in that the information carrier in the receptacle ( 6 ) additionally with on one side ( 2 ) is held in attacking suckers. Device for carrying out the method according to one of claims 1 to 8 or according to one of claims 23 to 30, comprising a tool lower part ( 7 ) with a recording ( 6 ) for fixing the plate-shaped information carrier, a relative to the tool lower part ( 7 ) substantially parallel to its surface displaceable tool upper part ( 8th ) with at least one layer from the surface ( 5 . 9 ) of the plate-shaped information carrier abschälenden Abrasionselement ( 10 ) from the group of knives, Abrasionsscheibe and having a turning unit ( 14 ) for turning the information carrier. Device according to claim 9, characterized in that the abrasion element ( 10 ) has a width which is greater than or equal to the diameter (B) of the disc-shaped information carrier. Apparatus according to claim 9 or 10, characterized by a on the surface ( 5 . 9 ) of the plate-shaped information carrier guided hold-down ( 11 ) in the cutting direction in front of the knife ( 10 ) is arranged. Apparatus according to claim 11, characterized by an additional, the knife trailing hold-down ( 12 ). Device according to claim 11 or 12, characterized in that the hold-down device ( 11 . 12 ) the width of the knife ( 10 ) having. Device according to claim 13, characterized in that the hold-down device ( 11 . 12 ) has a minimum length which corresponds to the order of magnitude of the diameter (B) of the information carrier. Device according to one of claims 9 to 14, characterized in that the arrangement of downholder ( 11 . 12 ) and knives ( 10 ) before movement in the cutting direction perpendicular to the surface ( 5 . 9 ) of the information carrier is lowered to this. Device according to one of claims 11 to 15, characterized in that the cutting edge of the knife ( 10 ) opposite the leading hold-down ( 11 ) has a defined, the depth of cut determining board. Device according to one of claims 11 to 16, characterized in that the depth of the receptacle is smaller than a minimum thickness of the information carrier reduced by the depth of cut. Device according to one of claims 11 to 17, characterized by in the tool lower part ( 7 ) at least one trained vacuum line, which opens into the bottom of the receptacle. Device according to one of claims 11 to 18, characterized in that the receptacle ( 6 ) a central, in a central opening of the inserted plate-shaped information carrier protruding centering pins ( 13 ) having. Device according to one of claims 9 to 19, characterized in that it is in the turning unit ( 14 ) is a vacuum pad. Device according to one of claims 9 to 20, characterized in that the turning unit ( 14 ) is rotatable or is rotated during operation. Device according to one of claims 9 to 21, characterized in that the turning unit ( 14 ) a disk-like agent ( 14a ), which has at least one slot ( 15 ) for receiving a plate-shaped information carrier. Method according to one of claims 1 to 8, characterized in that the turn of the information carrier is realized by means of a turning unit ( 14 ). A method according to claim 23, characterized in that it is in the turning unit ( 14 ) is a vacuum pad. Method according to one of claims 23 to 24, characterized in that the turning unit ( 14 ) is rotatable or is rotated during operation. Vefahren according to one of claims 23 to 25, characterized in that the turning unit ( 14 ) a disk-like agent ( 14a ), which has at least one slot ( 15 ) for receiving a plate-shaped information carrier. Method according to one of claims 1 to 8 or according to one of claims 23 to 25, characterized in that in DVDs as information carrier after abspanendem removing a label layer ( 16 ) and at least a portion of a first substrate layer disposed thereunder ( 17 ) on the first page ( 1 ) the information carrier is turned in order to subsequently at least a part of one on the first side ( 1 ) opposite second side ( 2 ) arranged carrier material layer ( 18 ). Method according to one of claims 1 to 8 or according to one of claims 23 to 26, characterized in that in DVDs as information carrier after abspanendem removal of at least a portion of a on the first side ( 1 ) opposite second side ( 2 ) arranged carrier material layer ( 18 ) the information carrier is subsequently turned to remove it on a first substrate layer after 17 ) arranged label layer ( 16 ) then at least a portion of the first substrate layer ( 17 ) remove with scrape. Method according to one of claims 1 to 8 or according to one of claims 23 to 26, characterized in that in the case of Bluray discs as information carrier after removal of a chip on the first side ( 1 ) arranged label layer ( 16 ) the information carrier is turned to then one on the first page ( 1 ) opposite second side ( 2 ) arranged information layer ( 19 ) remove with scrape. Method according to one of claims 1 to 8 or according to one of claims 23 to 26, characterized in that in the case of Bluray discs after removing the removal on the first side ( 1 ) opposite second side ( 2 ) arranged information layer ( 19 ) the information carrier is turned around, followed by a on the first page ( 1 ) arranged label layer ( 16 ) remove with scrape. Method according to one of claims 1 to 8 or according to one of claims 23 to 26, characterized in that label-free DVDs as information carrier after abspanendem removing at least a portion of a first substrate layer ( 17 ) on the first page ( 1 ) the information carrier is turned in order to subsequently at least a part of one on the first side ( 1 ) opposite second side ( 2 ) arranged carrier material layer ( 18 ).

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