DE102009050391A1 - Method for repairing plastic pallet with crack, involves positioning of recess bypassing crack in plastic pallet, where insertion piece is inserted in recess so that insertion piece bypasses crack - Google Patents

Abstract

The method involves positioning of a recess bypassing the crack (60) in the plastic pallet (10). An insertion piece is inserted in the recess so that the insertion piece bypasses the crack. The insertion piece is mounted on both sides of the crack with the plastic pallet. A hardening mass is filled in the recess.

Description

Technical area

The invention relates to a method for repairing plastic pallets, as well as repaired plastic pallets.

State of the art

Plastic pallets are used in large numbers, especially in the manufacture of automobiles, to transport the prefabricated parts from suppliers to the car manufacturer. In the field of food logistics, plastic pallets are valued because they are easier to clean than the otherwise usual wooden pallets.

Presentation of the invention

The loaded plastic pallets are usually moved by fork-lift trucks or so-called lift trucks or ants. The plastic pallets are regularly damaged, so they need to be replaced.

The invention has for its object to reduce the cost of replacing the defective plastic pallets.

This object is achieved by the method according to claims 1 and 7 and by the correspondingly repaired plastic pallets. Advantageous embodiments of the invention are specified in the subclaims.

Plastic pallets generally have a support body for goods to be transported on the plastic pallet and attached to the support body feet on which the plastic pallet can be parked. These feet are usually formed on the support body or formed integrally with the support body and open at the top, so that the same plastic pallets can be stacked. Some plastic pallets have at the edge of the support body one or more often circumferential Aufkantungen, so that on the plastic pallet goods to be transported can not slip from the plastic pallet.

• Typ 1: Ein vom Rand des Auflagekörpers ausgehender Riss. Solche Risse können im Bereich eines an den Auflagekörper angeformten Fußes enden.
• Typ 2: Ein Loch im Bereich eines der Füße in Form eines ausgebrochenen Kunststoffstücks. Diese Löcher entstehen in der Regel wenn eine Stapelgabel eines Gabelstaplers unter die Kunststoffpalette geschoben werden soll, aber nicht exakt zwischen den Füßen eingefädelt ist, so dass eine Gabelspitze der Stapelgabel mit einem der Füße der Kunststoffpalette kollidiert und diesen durchstößt. Dabei bricht in der Regel ein Kunststoffstück aus dem Fuß aus. Auch kommt es vor, dass im Bereich der Füße der Kunststoffpalette ein Kunststoffstück aus der Kunststoffpalette ausbricht und/oder ein Riss in der Kunststoffpalette entsteht, wenn die Kunststoffpalette nicht gleichmäßig oder auf einen unebenen Boden abgesetzt wird.

The invention is based on the observation that damage to the plastic pallets are usually assigned to one of the two types:

• Type 1: A crack originating from the edge of the support body. Such cracks can end in the region of a foot formed on the support body.
• Type 2: A hole in the area of one of the feet in the form of a broken piece of plastic. These holes usually arise when a stacking fork of a forklift is to be pushed under the plastic pallet, but is not threaded exactly between the feet, so that a fork tip of the stacking fork collides with one of the feet of the plastic pallet and pierces it. As a rule, a piece of plastic breaks out of the foot. It also happens that a plastic piece breaks out of the plastic pallet in the area of the feet of the plastic pallet and / or a crack in the plastic pallet arises if the plastic pallet is not deposited evenly or on an uneven floor.

Attempts to stick the joints of the cracks easy have shown that the bond breaks again from the edge of the support body. Attempts to glue broken plastic pieces back into the plastic pallet have shown that the bond is not sufficiently strong, so that the plastic piece breaks out again even under normal load on the plastic pallet or the foot.

Based on this observation, a way has been developed to repair damaged plastic pallets.

Damage of type 1 can be repaired if you prefer near the edge of the plastic pallet, z. B. in the area of the upstand, at least one recess in the plastic pallet, which bridges the crack. Subsequently, at least one insert is inserted into the recess so that it also bridges the crack and attached to both sides of the crack with the plastic pallet. Preferably, the recess is filled with a hardening mass, z. B. shed. Now forces acting on one side of the crack on the plastic pallet can be transferred from the insert piece over the crack to the other side of the plastic pallet and be introduced over a large area into the plastic. A renewed tearing of the crack from the edge of the plastic pallet is excluded.

The recess may for example be a recess introduced from the surface of the plastic pallet. Because it lies in the recess, it is not or only slightly beyond the recess. Therefore, the insert does not catch on other pallets.

Preferably, the recess is filled with a hardening mass, z. B. shed. As a hardening mass, each substance is referred to, which is first deformable or liquid and later solidifies. For example, a resin, in particular epoxy resin or a heated thermoplastic can be used. Both epoxy resin and most thermoplastics are easy to process, especially after Cure and / or plane, so that the surfaces of the now filled recesses can be easily flush with the adjacent surface of the plastic pallet.

Preferably, the crack is pressed together before the attachment of the insert. This will make the remaining gap small. After fixing the insert, the crack is fixed in size.

Preferably, the crack is glued. This can z. B. applied a curing mass on one or both cleavage surfaces of the crack and the crack are then joined together. It can also, especially after the crack has joined together and z. B. was fixed by the insert, a low-viscosity adhesive is inserted into the remaining gap of the crack. Then the adhesive is pulled into the gap by capillary forces. The surfaces of the plastic pallet remain largely clean.

For example, the recesses can be milled into the plastic pallet or be punched out of it.

As insert is especially a flat iron suitable because it can be easily cut from a larger piece to the required size. Of course you can as an insert also a profile, z. B. use a rather flat U-profile made of metal or plastic. These are particularly torsionally rigid, which has a positive effect on the resilience of the repaired plastic pallet.

The insert can be connected in particular by bolting, riveting and / or screwing on both sides of the crack with the plastic pallet. Such compounds can be produced quickly and cheaply and can transmit high forces.

Preferably, the Einlegstück is roughened at least with the side with which it is inserted into the recesses. In particular, when the insert is pressed against the bottoms of the recesses when joined to the plastic pallet, the roughened surface of the insert is forced into the plastic pallet and interlocks with the plastic pallet. Accordingly, the insert and the plastic pallet are particularly non-positively connected.

Type 2 damage can be repaired by inserting at least the area of the plastic pallet from which the piece has broken into a negative mold. In addition, a second negative mold is placed on at least the region of the plastic pallet from which the piece has broken out, so that the plastic pallet with the hole between the first and the second negative mold is. The hole is closed with a hardening mass that is introduced at least into the area of the plastic pallet from which the piece has broken out. Once the hardening mass is at least so strong that it no longer deforms itself by gravity, the plastic pallet can be removed from the mold.

The introduction of the curing mass may, for. B. thereby, that this is initially applied only in the vicinity of the hole on the plastic pallet. Subsequently, the second negative mold is placed on the plastic pallet and thereby pressed the hardening mass through the second negative mold in the area from which the piece is broken out. This also allows holes in the vertical direction to fill with the hardening mass. For example, the term proximity refers to an area of about 15 to 20 cm around the edge of the hole. For example, in the case of a hole in the foot, the term proximity refers to the area to be assigned to the foot. Of course, no firm demarcation can be made here. It is important that the hardening mass is deposited so that it is pressed at the latest when joining the negative molds to the plastic pallet, the hardening mass at least in the hole to be closed so that it fills the hole on one side and at the same time the largest possible surface with the plastic pallet is in contact, because thereby the adhesive surface is correspondingly large.

Preferably, not only the hardening mass but also at least one solid is introduced into the region from which the hole has broken out. In particular, z. B. foam particles, such as. B. Styrofoam crumbs are mixed with the hardening mass and introduced with this in the said area. Alternatively or additionally, fibers can also be mixed with the hardening mass. As a result, on the one hand, the costs for the hardening compound can be reduced and, at the same time, the material properties of the repaired plastic pallet can be improved.

If introduced before the introduction of the hardening material on both sides of the hole depending on the hole recess in the plastic pallet and at least one hole bridging insert is inserted into the recesses, then creates a particularly resilient repair. Preferably, the insert is not only inserted into the recess, so that it is connected by the hardening mass with the plastic pallet, but also additionally connected to the plastic pallet, z. B. bolted, bolted or riveted. This is preferably done before the curing composition is introduced.

The edge region of the hole in the plastic pallet is preferably angeschäftet prior to introduction of the curing mass, particularly preferably on both sides angeschäftet. As a result, the curing mass is particularly reliable after curing connected to the plastic pallet.

Description of the drawings

The invention will now be described by way of example without limitation of the general inventive idea by means of embodiments with reference to the drawings.

1 shows damaged plastic pallet,

2 shows the detail A of the plastic pallet 1 .

3 shows an exploded view explaining the repair method,

4 shows detail A after the repair,

5 shows a damaged foot of a plastic pallet,

6 shows another view of the damaged foot of the plastic pallet,

7 shows an exploded isometric exploded view illustrating the repair process,

8th shows a cross-section illustrating the repair process,

9 shows a repair process illustrative cross-section, and

10 shows the plastic pallet after repair (in cross-section).

1 shows a damaged plastic pallet 10 , The plastic pallet 10 has a plate-like support body here 12 the top as a support surface 13 for on the plastic pallet 10 serves to be transported goods. To the support body 12 are feet 16 integrally formed, wherein the support body 12 one recess each in the area of the feet 17 has, so that when stacking similar plastic pallets feet 16 an upper plastic pallet 10 in the recesses 17 the underlying plastic pallet 10 intervention. The support body 12 has one as an upstand 14 trained circumferential edge. From this edge go two cracks 60 out, so the stability of the plastic pallet 10 is no longer guaranteed. In 2 is the right one (referring to 1 ) of the two cracks 60 clearly visible.

To repair a crack 60 gets into the plastic pallet 10 a recess 20 introduced, z. B. milled, which over the crack 60 passes away (cf. 3 ). In other words, on both sides of the crack is ever at least one depression in the surface of the plastic pallet 10 brought in. In the example in 3 this recess became 20 in the outside of the upstand 14 brought in. Subsequently, in the recess 20 an insert 24 inserted so that it ruptures 60 bridged. The insert 24 Now with the plastic pallet 10 positively connected. For this purpose were in the insert 24 and in the area of the recess 20 in the plastic pallet 10 overlapping holes ( 26 . 22 ), through which the insert part 24 about blind rivets with the plastic pallet 10 is connected. This will prevent the crack 60 continue in the plastic pallet 10 continues. In addition to the repair with the insert 24 the crack is glued (cf. 4 ) and the recess 20 with a hardening mass (not shown) potted. The repaired plastic pallet 10 has again the necessary stability to continue to be used.

5 and 6 demonstrate ( 5 from below and 6 from the top) a damaged foot 16.1 a plastic pallet 10 , The plastic pallet 10 otherwise corresponds to in 1 shown plastic pallet, therefore, the same reference numerals for the same or similar details are used and in terms of the description of the plastic pallet 10 is to avoid repetition in this regard to the description 1 directed. The foot 16.1 was pierced by a tip of a forklift fork so that a plastic piece (not shown) broke out and the foot broke 16.1 now a corresponding hole 30.1 having. In the same way was another foot 16.2 the plastic pallet 10 damaged (only in 8th and 9 shown)

For repair of damages of feet 16.1 respectively. 16.2 , at least the area around the feet 16.1 respectively. 16.2 in a negative form 40 used, as in the 7 to 9 indicated by reference arrows. In addition, in the area of the hole 30.1 or the hole 30.2 a hardening mass 50 (in 7 only by an arrow 50 indicated) introduced and a second negative mold on the plastic pallet 10 placed. The negative forms 40 . 44 are compressed so that the hardening mass is the space between the negative molds 40 . 44 fills. Any excess mass 50 quilt from the negative forms 40 . 44 out and can be easily removed. Alternatively, at least one negative mold 40 . 44 at least one opening for introducing the hardening mass 50 exhibit. After curing the mass becomes the plastic pallet 10 demolded and the plastic pallet 10 can still be used.

LIST OF REFERENCE NUMBERS

10

Plastic pallet

12

support body

13

bearing surface

14

backsplash

16

Foot of the plastic pallet

16.1

Corner foot of plastic pallet with hole

16.2

Metatarsal of plastic pallet with hole

17

recesses

20

recess

22

Hole in the upstand

24

insert

26

Holes in insert

28

Fasteners (here blind rivets, for example)

30.1

Hole in foot 16.1

30.2

Hole in foot 16.2

40

first negative form

44

second negative form

50

hardening mass

60

Crack

Claims (15)

Method for repairing a plastic pallet ( 10 ) with at least one crack ( 60 ), comprising the steps of: - introducing a crack ( 60 ) bridging recess ( 20 ) in the plastic pallet ( 10 ), - inserting at least one insert ( 24 ) in the recess ( 20 ), so that the insert ( 24 ) the crack ( 60 ) and fastening the insert ( 24 ) on both sides of the crack ( 60 ) with the plastic pallet ( 10 ). Method according to claim 1, characterized in that a hardening mass ( 50 ) in the recess ( 20 ) is filled. Method according to one of the preceding claims, characterized in that the crack ( 60 ) at the latest before the insert ( 24 ) on both sides of the crack ( 60 ) with the plastic pallet ( 10 ) is compressed. Method according to one of the preceding claims, characterized in that the crack ( 60 ) is glued and / or filled. Method according to one of the preceding claims, characterized in that for introducing the recess ( 20 ) into the plastic pallet ( 10 ) is milled. Method according to one of the preceding claims, characterized in that an insert piece ( 24 ) is used, which has at least one roughened surface, which when inserting the insert ( 24 ) to the bottom of the recess ( 20 ) is placed. Method for repairing a plastic pallet ( 10 ), in particular according to one of the preceding claims, from which at least one piece has broken out, whereby the plastic pallet ( 10 ) at least one hole ( 30.1 . 30.2 ), comprising the steps: - inserting at least the area of the plastic pallet ( 10 ), from which the piece has broken out into a negative form ( 40 ), - introducing a hardening mass ( 50 ) in the area of the plastic pallet ( 10 ) from which the piece has broken out, - placing a second negative mold ( 44 ) on at least the area of the plastic pallet ( 10 ) from which the piece has broken out, leaving the plastic pallet ( 10 ) between the first negative form ( 40 ) and the second negative form ( 44 ). A method according to claim 7, characterized in that when placing the second negative mold ( 44 ) by placing the second negative mold ( 44 ) the hardening mass ( 50 ) is pressed into the hole. A method according to claim 7 or 8, characterized in that before and / or with the introduction of the hardening mass ( 50 ) at least one solid is introduced into the area from which the piece has broken out. Method according to one of claims 7 to 9, characterized in that prior to introduction of the hardening mass ( 50 ) on both sides of the hole ( 30.1 . 30.2 ) one to the hole ( 30.1 . 30.2 ) subsequent recess introduced into the plastic pallet and at least one insert the hole bridging insert is inserted into the recesses. Method according to one of claims 7 to 10, characterized in that prior to introduction of the hardening composition ( 50 ) the plastic pallet in the edge area of the hole ( 30.1 . 30.2 ). Pallet with at least one repaired damage, the pallet having at least one recess 20 in which an insert part 24 is attached. Pallet with at least one repaired damage where the damage included a hole closed by a hardening mass. Pallet according to one claim 12, characterized in that the pallet at least one recess 20 in which an insert part 24 is attached. Pallet according to claim 12 or 14, characterized in that the insert at least partially bridges the damage.

Images