DE4331131A1 - Process for producing an endless reinforced and flat rubber band - Google Patents

Abstract

Arranged one after the other on a supporting element are a lower rubber ply, a lower reinforcing ply, an intermediate rubber ply, an upper reinforcing ply and an upper rubber ply, which are then bonded by vulcanising to form a rubber band, after which the supporting element is removed. The reinforcing plies in each case comprise a reinforcing filament which is wound helically on the rubber ply located thereunder. The windings of neighbouring reinforcing plies are oppositely directed, in order that the subsequent band can absorb not only forces in the course of its running direction but also in the transverse directions.

Description

The invention relates to a method for producing an endless reinforced and flat rubber band, especially an endless sepa rierbandes, with those listed in the preamble of claim 1 Features and a rubber band produced according to the in The preamble of claim 5 features listed.

The aforementioned endless separating belts are used for separation ren of substances, for example to separate the meat from Bones, cheese from the rind, bananas from the skin and the like. v. m. Of the Use is not limited to food processing, son it can take place wherever different materials are used Hardness and elasticity should be separated. The end los separating belt runs around a recessed one Drum, the material to be separated between the belt and the drum  mel is given so that the soft materials through the recesses squeezed in the drum and separated from the hard materials.

The endless separating belts used here are highly stressed Components, because on the one hand they have a high elasticity, on the other hand also must have a high abrasion resistance. Especially when Use in the food industry is the abrasion resistance of Meaning. Such endless separating belts are indeed between temporally also made of plastic, but the manufacturing process very expensive, resulting in higher manufacturing costs precipitates. A manufacturing process for such a tape is in known for example from DE 40 16 902 C2. But train them Plastic-made separating belts in addition to the cost disadvantages especially in the food sector with regard to the never abrasion problems to be completely avoided.

In the previously known rubber-based endless sepa Rierbänder is a reinforcement made up of two, incorporating one Intermediate layer formed in the band embedded tissue inlays. The Fabrics are designed to withstand tensile forces in both Bandrich tion as well as in the transverse direction; at her They overlap at the ends. Due to the strong walking in the company and the relatively narrow deflection often leads to cracking of the belt in the area of the beginning or end of the tissue. Farther Problems with the layer adhesion between rubber and Fabric that essentially depends on the fabric coating are dependent and therefore hardly ver in the manufacturing process to be avoided. This can lead to separation of layers and thus also lead to premature wear.

Proceeding from this, the present invention has the object based on a process for making an endless armored  and flat rubber band, in particular an endless separating belt to further develop so that the aforementioned errors are avoided and in a technically simple and inexpensive way permanent tape can be made.

According to the invention, this is achieved in that as an armie approximately layers instead of the previously known textile fabric Reinforcement thread is inserted, which is wound up helically is in such a way that neighboring reinforcement layers against are frequently wound.

With the method according to the invention, endless rubber bands can be are produced, which have the disadvantages mentioned at the outset Reinforced rubber bands do not have fabric insert and so can absorb higher tensile forces and are more wear-resistant. There through that the reinforcement threads are wound individually, if a sufficient winding distance is maintained, a complete embedding of the thread in the rubber, creating a practically irreversible composite is produced. Farther becomes a reinforcement layer by winding a thread completely avoided a weak point within the band, so that the Tape the same tensile strength over its entire circumference without Has inhomogeneities. By screwing the rewinder the reinforcement thread does not run parallel to the Longitudinal axis of the tape, but at an angle to it. Because due the opposite winding direction of the neighboring armie situation is always ensured that at least two reinforcements threads in different angular directions to the longitudinal axis of the tape not only can tensile forces run in the direction of the belt, but also across from the reinforcement layers the, without there being a separate reinforcement in this direction required, as is the case with known fabric inserts.  

For an intimate bond between the respective reinforcement thread and to reach the underlying rubber layer, the opening takes place winding preferably under tension, with constant Feed across the winding direction to a constant slope in the To reach winding. The reinforcement layers can thus be wrapped mechanically and with little effort become.

In order to further increase the homogeneity of the tape, it is from Advantage if the ends of the reinforcement threads are not free to the outside protrude, but in a direction essentially towards the middle of the band Direction in the respective reinforcement layer. Then can also the tensile forces occurring in the end areas on the surrounding rubber can be transferred.

To further increase the tensile strength, additional armies can be used tional positions are provided, this each under links Intermediate rubber layer is carried out to ensure full embedding to ensure the reinforcement thread in the rubber. Important is thereby that the orientation of successive reinforcements were in opposite directions, so also for tensile loads perpendicular to the um good homogeneity of the belt is achieved.

The invention is based on a Darge in the figures presented embodiment explained in more detail. Show it

Fig. 1 shows a schematic representation of the side view of an endless Separierbandes,

Fig. 2 shows a section along the section line II-II in Fig. 1 and

Fig. 3 in an enlarged view a cross-section through the belt of FIG. 1.

In Fig. 1 an endless Separierband 1 is shown in side view. The running directions are marked with 2 . The longitudinal center plane of the tape is indicated in the lower area and marked with 3 be.

The structure of the band 1 results from the sectional view according to FIG. 2. The inside of the band 1 is formed by a lower rubber layer 4 , on which a lower reinforcement layer 5 is arranged, which is covered by an intermediate rubber layer 6 upwards. On the intermediate rubber layer 6 , a further upper arming layer 7 is arranged, which in turn is covered by a relatively thick rubber layer 8 .

The reinforcement layers 5 and 7 are each formed from a helical winding thread 9 and 10 , respectively. In FIG. 2, the winding direction of the reinforcement threads 9 and 10 can be seen, within the bounded by surfaces hand lines, in which the reinforcement threads are exposed. From this it can be seen that the reinforcement threads 9 and 10 of the reinforcement layers 5 and 7 are wound with the same axial feed, but in different winding directions in order not only to be able to accommodate tensile forces in the running directions 2 of the band 1 , but also transversely thereto. The lower reinforcement layer 5 is wound with a slope that is equal to a slope of the upper arming layer 7 , but based on the longitudinal central axis 11 of the band in the opposite direction.

Furthermore, it can be seen from Fig. 2 also within the lines outlined by hand lines that the thread ends are not exposed at the edge of the tape, but are integrated in the direction of the longitudinal center axis 11 in the respective reinforcement layer 5 and 7 respectively.

The above-described endless separating belt 1 is produced on a rotatable mandrel, the lower rubber layer 4 first being applied, then the reinforcing thread 9 being wound over it and the thread ends being knocked in as described above. This lower reinforcement layer 5 is then covered with a comparatively thin intermediate rubber layer 6 , on which the reinforcement thread 10 of the upper reinforcement layer 7 is then wound. After the thread ends of this reinforcement thread 10 have been knocked in, the upper rubber layer 8 is then applied and vulcanization takes place, after which the finished endless separating belt 1 is removed from the mandrel of the winding machine.

Reference list

1 - endless separating belt
2 - running directions
3 - longitudinal median plane
4 - Lower rubber layer
5 - Lower reinforcement layer
6 - Intermediate rubber layer
7 - Upper reinforcement layer
8 - Upper rubber layer
9 - reinforcement thread of ( 5 )
10 - reinforcement thread from ( 7 )
11 - longitudinal central axis
12 - thread ends of ( 5 )
13 - thread ends of ( 7 )
α - slope of ( 5 )
ß - slope of ( 7 )

Claims (6)

1. A method for producing an endless reinforced and flat rubber band ( 1 ), in particular an endless separating belt, in which a lower rubber layer ( 4 ), a lower reinforcement layer ( 5 ), an intermediate rubber layer ( 6 ), an upper reinforcement layer are successively on a support body ( 7 ) and an upper rubber layer ( 8 ) and then connected by vulcanization to form a rubber band ( 1 ), after which the support body is removed, characterized in that on the lower rubber layer ( 4 ) a reinforcing thread ( 9 ) helically as the lower reinforcing layer (5) and on the intermediate layer (6) has a reinforcement yarn (10) wound helically as an upper reinforcement layer (7) and that the Armie approximately plies (5,7) are wound in opposite directions. 2. The method according to claim 1, characterized in that the reinforcing threads ( 9 , 10 ) are wound under tension. 3. The method according to claim 1 or 2, characterized in that the ends ( 12, 13 ) of the reinforcing threads pointing essentially towards the center of the band ( 11 ) are divided into the respective reinforcing layer ( 5 , 7 ). 4. The method according to any one of the preceding claims, characterized characterized that further Armie wound from reinforcing threads situations are provided, each with the inclusion of a Intermediate rubber layer on the underlying reinforcement layer like this be arranged that successive reinforcement layers against are frequently wound. 5. Endless, flat and reinforced rubber band ( 1 ), in particular endless separating band, consisting essentially of rubber layers ( 4, 6, 8 ) with reinforcement layers ( 5 , 7 ) in between, which are connected by vulcanization to form a rubber band ( 1 ), characterized in that the reinforcement layers ( 5, 7 ) are formed from helically arranged reinforcement threads ( 9 , 10 ) and in that the circumferential direction of the reinforcement threads ( 9 , 10 ) of adjacent reinforcement layers ( 5 , 7 ) is opposite. 6. A rubber band according to claim 5, characterized in that the ends ( 12 , 13 ) of the reinforcing threads ( 9 , 10 ) pointing substantially towards the middle of the band ( 11 ) in the respective reinforcing layer ( 5 , 7 ) are divided.