US 20050011374 A1
According to the invention, in order to transport empty PET containers, said containers are compacted to form a packet (18) and are held in the compacted state by means of encompassing means (28). In this way, the transport volume of the containers is significantly reduced.
1. Method of producing a transport unit (18, 28) of substantially empty, compacted plastic containers (17), specifically of not sorted PET-bottles, for a transporting thereof to a reclamation site, whereby a respective plurality of containers (17) is compacted into a package (18) and retained by wrapping means (28, 38) in a package shape and is provided in this manner as transportable package and the wrapping means (28) retains the package in a compacted state and is a wrapping means (20) or a encasing means which is placed in a state of the package held compacted around same, characterized in that the forming of the package proceeds in a plurality of steps by adding individual or several containers (17) to a already compacted partial package (18′).
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14. Press (20) for the production of a transport unit (18) of compacted plastic containers (17), which press (20) is provided with a compacting chamber, and a compacting means (14, 15) for a compacting of containers (17) to be compacted into a package (18) and received in the compacting chamber and includes a wrapping arrangement which has at least one wrapping means (28, 38) adapted to encase the packages compacted into a package in a compacted state which remains at the package, characterized in that the press is designed for the forming of the package in a plurality of steps by a adding of individual or several containers (17) to a already compacted partial package (18′), and includes retaining means (16, 16′) by means of which the partial package is arrestable in the compacting chamber in a compacted state.
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This application claims the priority of the European Pat. application No. 01 124 371.4 of Oct. 24, 2001 of which the contents are included in the present application by reference thereto.
The invention relates to a method according to the introductory portion of claim 1. The invention relates further to a press for plastic containers according to the introductory portion of claim 14.
Whereas in many countries a tradition of reclamation in the areas paper, glass, metal and organic refuse exists since many years and the markets of these materials have began to run more or less smoothly, the reclamation of plastic wastes is still comparably seldom. The separate collecting and reclamation of plastic containers is ecologically superior to their burning. In order, however, to consider the reclamation a sufficient minimal amount of same plastic materials must be present. This is the case in the field of the PET-beverage containers. A substantial advantage of PET (polyethyleneterephthalate) versus many other plastics consists in that this material can be processed further during the reclamation to high quality products, that is that no downcyling occurs.
Due to the worldwide rapid spread, PET has achieved a large importance in the packing industry and has gotten to become a sought after raw material. For this reason a large demand exists for reclaimed PET, PET belongs to the plastic materials with a small environmental impact during the production and the waste management. Among other, following possibilities of use exist in the textile field as filling material for cushions, fibers for sport and fleece jackets, backpacks, sport shoes, carpet coatings, etc. In the field of containers yogurt containers, margarine and biscuit containers, etc.
For the production of reclaimed PET the decentralized collected PET-bottles are transported to logistic centers where they are sorted according to color and quality and are processed to compacted bales having a weight of from 100 to 300 kilograms, which can be stored temporarily. Thereafter, the processing of the sorted bottles to reclaimed matter follows, whereby it is checked manually and by machines if all foreign matter has been removed. Thereafter, the labels are detached by steam and removed. The bottles (including closure caps) are reduced in mills to shavings. These are pre-washed, in order to be cleaned thereafter in a second washing process from adhering residues of adhesives. The washing liquid can be used again for further washing processes. The clean sheavings are separated according to the kinds of plastic PET (bottle bodies) and Polyethylene(caps) according to their different densities (PET sinks in water, but polyethylene swims) and thereafter dried, dust is removed as well as possible remaining metal particles. In a last process step the shavings are homogenized in large mixers to charges with precisely defined values, filled into transport bags and passed on to the respective processing stations.
The decentralized collecting and the following transporting of the empty PET-bottles requires corresponding expenditures. Collection containers are placed at retail trade businesses, in dining establishments, offices or at recreation areas. All collected PET-beverage containers are brought thereafter by transport companies to one of the PET-logistic centers in which the reclaiming production occurs.
In order to arrive at a as small as possible transport expenditure from the collecting areas to the logistic centers the reduction of the volume of the returned PET-beverage bottles is of a substantial importance. By means of this measure the number of transports can be reduced which is of a positive influence regarding the costs on the entire chain of logistics and accordingly the price of the reclaimed PET. PET-bottles can be compacted during all steps of the disposing chain. Ideally, the compacting to a flat state should happen, however, as early as possible.
According to the prior art the PET-bottles are compressed not at all, or then manually or by various kinds of presses and filled loosely into large plastic bags having a size of e.g. 100 Liters. Depending from the kind of the compacting of the bottles total compacting grades of the bottles prepared for transportation amounts from 0% to about 40%.
It is known to compact PET-bottles to bales or packages and to hold these together by straps. Such packages lead to a higher total compacted state and require, therefore, less transport capacity. The documents JP-A-2000 095219, JP-A-2001 259893 and JP-A-2001 087894 disclose large compacting plants in which a large number of PET-bottles are compacted simultaneously by one single compacting movement in a compacting chamber and are, thereafter, ejected in a compacted state through a channel of the pressing plant. At the end of the channel a step-wise exiting the channel takes place and straps are placed around the compacted package. These compacting plants are quite large and, therefore, not suitable for a direct use in stores. Initially, enough bottles must be collected at these compacting apparatuses until they can be compacted in one step to a package. The EP-A-0 941 941 discloses various variants of waste compacter, whereby the compacting occurs into one respective waste bag. At a package of PET-bottles, which expands after the release of the compacting pressure, no large compression can be reached by these presses because the compacting plate must be moved out of the bag when retrieving the bag from the press. The U.S. Pat. No 5,056,428 discloses the compacting of vehicle tyres whereby no enclosed compacting chamber is foreseen for this process. The GB-A-1 537 659 discloses a bale press for office waste and cardboards waste.
The initial object of the invention is to provide greatly compacted packages of PET-containers by a simple and space saving procedure. This allows the provision of such packages also in shops and stores where the containers are returned individually or in small numbers and at various times.
This object is solved by the method of the kind set forth above and the characterizing features of claim 1.
Because the production of the package proceeds in a plurality of steps, respectively newly added containers can be added directly to the already compacted containers in the press, such that no separate storage chamber is necessary for the containers. This leads to a substantial reduction of the apparatus for compacting the package.
The wrapping or encasing of the packing occurs preferably in the same compacting chamber in which the package is compacted. Thus, the compacting apparatus can be designed still smaller, because no separate channel for a emitting of a compacted package and for its subsequent wrapping. The container to be added is preferably compacted directly on the partial package.
The package is held together by the wrapping means so that it forms a unit suitable for transport. The wrapping means retains, thereby the package in a compacted state, so that the compacted state of the finished package as transportable unit corresponds substantially to the one of the compacting the containers to the package. As wrapping means preferably cords or straps can be considered, which are placed around the containers in the state compacted into a package.
The forming of the package proceeds preferably in a container press which compacts the individual containers before or after the forming of the package. The forming of the package is, however, possible also in a separate press.
The packages are preferably of a square or cubical shape in order to provide transport units which are to the placed for transport closely side by side. For ease of handling packages have preferably a weight from 10 kilograms to 20 kilograms.
The invention is based, furthermore, on the object of providing a press by means of which a substantial increase of the total degree of the compactness of a plurality of containers and, therefore, a substantial reduction of the transport volume of a given amount of containers can be arrived at.
This object is met by a press design with the characterizing features of claim 14.
Because the press comprises, besides the compacting means for compacting individual containers, or possibly simultaneously a plurality of containers further means by means of which a compacted and wrapped held package may be produced from the compacted containers, a considerably larger total degree of the compacting and a correspondingly considerably lower transport volume, respectively can be arrive at.
Below, exemplary embodiments of the invention are explained more in detail with reference to the drawing, whereby
FIGS. 15 to 20 a example for the wrapping of the package in the press.
FIGS. 1 to 9 illustrate schematically the procedure according to the invention. The empty PET-bottles are, thereby, compacted to a package 18 such as schematically illustrated in
The producing of a compacted package of bottles can proceed variously. Preferred and hereinafter still described in detail with reference to a press is a procedure according to which the individual bottles are compacted in a press and simultaneously compacted in this press to a package. The wrapping means around the completed package is placed into this press, too, so that the completed package can be removed from the press. A proceeding according to a different kind for producing packages is, however, also possible: Accordingly, for instance, individual or several bottles can be compacted in a first press. Immediately afterwords or after a temporary storing, the already compacted bottles are compacted and held together by wrapping means as package in a further press which has a compacting chamber in accordance with the desired shape of the package. The press used thereto can include e.g. a square shaped compacting chamber which is closed off at its top side by a compacting plate, which after the filling of the compacting chamber with a amount of bottles corresponding to the desired size of the package or the desired weight of the package, respectively, reduces the compacting chamber operated manually or by a motor, so that the bottles are compacted into a package shaped block. This block is then wrapped by e.g. straps or cords so that the package is produced. The wrapping will be explained in detail later with reference to a embodiment.
A different procedure can be followed also in such a way, that the not compacted bottles are filled in a sufficient number into a compacting chamber which corresponds to the desired shape of a package, whereafter a compacting plate compacts the bottles and also forms the package of the compacted bottles in a single processing step. Also in this case the package is again stabilized regarding its shape by the wrapping means, so that it forms a transport unit.
The produced packages are preferably of a square shape and have a weight of about 5-20 kilograms wherewith a easily manageable transporting shape for the bottles is arrived at. Obviously also other, e.g. cubic or cylinder like shapes are possible for the package. Depending from the filling of the bottles into the compacting chamber a more or less orderly position of the bottles inside of the package is arrived at. Thereby large, i.e. 1 liter to 2 liter bottles are oriented often in the longitudinal directions of a square shaped package. Smaller bottles are encountered oriented also in the longitudinal direction, but also oriented laterally or obliquely. The bottles can, thereby, have caps or be without caps, whereby it is preferred that e.g. needle or spine shaped elements are foreseen which can cause a puncturing of closed bottles. Such a puncturing is, thereby, always ensured if, as will be described later, the bottles are compacted individually.
As already mentioned, straps or cords which hold the package together can be used as wrapping means. As holding together shall be understood that a transportable unit is produced, which as a rule is ensured if the wrapping proceeds at a compacted package. By the restoring property of the compacted bottles a force acting onto the wrapping means is produced which prevents a loosening of the wrapping means. By means of this the package is kept in the compacted state. Instead of straps or cords it is also possible to use a foil, e.g. a shrinking foil as wrapping means which holds the bottles compacted into a package shape together. Also a bag can be used, whereby it then, in contrast to the prior art, does not contain empty bottles but encases the bottles compacted to a package shape in such a manner, that the compacted package shape remains maintained.
Below, a preferred method and a preferred press, respectively, for the production of the package shaped transport units of the PET-bottles will be described more in detail.
In order to enable the forming of a package in the compacting chamber the lower compacting plate 19 is mounted for a movement in the vertical direction. When no partial package has as yet been formed in the press, the lower compacting plate 19 has been displaced completely upwards so that the first bottle of the package is compacted between the compacting plate 15 and the compacting plate 19. Each of the further bottles being added increases the respective force acting onto the lower compacting plate 19 at the lower dead center position of the upper compacting plate 15. The lower compacting plate 19 is thereby preferably arranged for a downwards movement in such a manner, that it upon a exceeding of a predetermined force displaces downwards by one unit of length wherewith the compacting chamber increases regarding its volume. Obviously, the volume increase of the compacting chamber can also be achieved in a way different than depending from a force, e.g. every time after a predetermined number of compacting operations. Then, further bottles can be added in the increased compacting chamber to the partial package now being formed, whereby every time again, when the increasing number of packages leads to a reaching of the triggering force for the lower compacting floor 19, a further downwards displacing thereof by one unit of length takes place (in place of a displaceable press bottom 19 it could also be foreseen to have a compacting plate 15 with a variable maximal compacting stroke). With this procedure a stepwise forming of the partial package 18′ in the compacting chamber takes place. This process is terminated when the compacting plate 19 has reached the lowermost point of its possible path of displacement. In this instance the package is complete or is possibly further completed until also then the maximal allowable pressing force is arrived at. A corresponding annunciation can indicate to the operator that now the package has been completely formed in the compacting chamber. Then, initially a position according to
The trough 32 rotates, thereby, after the depositing of a container to be compacted thereinto, so that it is moved towards to compacting chamber.
Some reference numerals as used until now identify thereby parts of this motor driven press 20′ having the same function. The drive of the levers for the upper compacting plate 15 comes from the motor, e.g. through a transmission arrangement with a chain drive. The retaining means 16 are moved e.g. over a cam disk, so that they are also driven by the motor 31. A pivotable plate 32′ can always safely empty the trough 32 and transport the container to be compacted into the compacting chamber and close it off against the through 32 during the compacting process.
In this example the lower delimiting part 19 is mounted to a driven, rotatable threaded spindle 50 (thread not illustrated.), so that the bottom plate 19 is driven and displaceable upwards and downwards. When the compacting force has grown that large that the spring 51 is compressed so much that a contacting occurs of the sensor 52, the lower delimiting part 19 is every time moved downwards for a increasing of the compacting chamber until the distance of the sensor corresponds again to the set distance or is displaced downwards by a predetermined measure.
Alternatively, the compacting bottom or the lower compacting plate 19 could be at the already described manual press 20 e.g. supported for a displacing in a roller guide at the frame of the press 10. The lower compacting plate 19 could be attached to a chain which is guided and connected through a sprocket wheel to a friction clutch. The friction clutch is a off the shelf element which, when exceeding a predetermined force rotates through a predetermined angle of rotation. In this way a displacing downwards of the compacting floor 19 occurs if a predetermined force act thereonto which exceeds the set force of the friction clutch. The coupling keeps on rotating until the acting force falls again below the set predetermined force; accordingly, the compacting bottom moves during the same time span also downwards. Thereafter, the pressing can again proceed at this level position of the compacting plate 19 until the set force of the friction clutch is again exceeded. The limiting of the compacting force by the friction clutch can additionally avoid a distruction of glass bottles which have been deposited erroneously in the press. The friction clutch allows, furthermore, a substantially free displacing upwards of the compacting floor 19 when the package has been taken out of the compacting chamber. To this end the clutch is disengaged. In order to displace the compacting bottom 19 upwards not illustrated manually or motor driven operating means can be foreseen.
The FIGS. 15 to 20 illustrate the placing of a wrapping means around the package in a simplified manner, whereby in the illustrated example it is a cord or a strap 38 which can be pulled off a reel 40. In the Figures the press is, thereby, illustrated schematically only and only as far as necessary for the understanding of the wrapping procedure.
Instead of the illustrated cords or already explained weldable straps it is also possible to use e.g. plastic straps which are closed by a clamp to a wrapping. Corresponding systems are known and must not be described herein further.