Reinforcing tape and molded parts

Abstract

Reinforcing strip (10) for insertion into a molded body made of an injectable compound, comprising a strip-shaped base body (12) made of a metal, which has a plurality of widened slots (24; 32) and which is bendable to form a U-profile (42) with a base (44) and two legs (46) projecting from the base (44), wherein the base body (12) has a first edge section (14), a second edge section (16) and a central section (18) arranged between the two edge sections (14, 16), wherein in each of the edge sections (14, 16) in the longitudinal direction of the strip (B) L ) a row (20) with first slots (24) is introduced, wherein in the central section (18) in the longitudinal direction of the band (B L ) a first row (30; 34; 36) with second slots (32) is provided, wherein the first slots (24) and the second slots (32) are in the longitudinal direction of the band (B L ) are spaced apart from each other and are oriented in the transverse direction of the band (B Q) overlap such that the first slots (24) and the second slots (32) form neutral fibers (40) between them, and wherein the neutral fiber (40) is arranged in the base (44) in the bent state.

Description

[0001] The invention relates to a reinforcing strip for insertion into a molded body made of an injection-moldable compound, comprising a band-shaped base body made of metal which has a plurality of widened slots. The invention further relates to a molded body made of an injection-moldable compound with such a reinforcing strip.

[0002] A reinforcing strip of the type mentioned above is used as an insert to reinforce a molded part made of an injection-moldable compound, such as a sealing or edge protection strip made of an elastomeric material. For this purpose, the reinforcing strip is formed into a V-profile or a U-profile and then overmolded with an injection-moldable compound, such as a plastic and / or an elastomer, in an extrusion process.

[0003] To create a bond between the injection-moldable molding compound and the reinforcing strip, the reinforcing strip is slit. The slits are created in a continuous manufacturing process by roll cutting, and in a subsequent stretching and / or drawing process, the slits are widened into openings. This creates a mechanical connection between the reinforcing strip and the injection-moldable molding compound.

[0004] During extrusion, high longitudinal forces act on the reinforcing strip. Consequently, the reinforcing strip must possess high tensile strength. The tensile strength of the reinforcing strip is determined on the one hand by the material properties and thickness of the reinforcing strip, and on the other hand by the neutral fibers formed between the overlapping openings.

[0005] DE 10 2014 010 822 U1 discloses a support profile, particularly made of metal for the manufacture of seals, with a ribbon-shaped support comprising a central section and two outer edge sections connected along a connecting line. The central section has rhomboid-shaped, closed through-openings, and the edge sections have elongated, slot-shaped cutouts such that the through-openings within the central section overlap and form a neutral axis between them, and that the through-openings and cutouts overlap and form a neutral axis between them. Both the through-openings and the cutouts are produced by a stamping process using scrap material.The stamped support profile is bent into a U-profile along the connection line, with the neutral fibers formed between the through-holes and the cutouts being located within the legs of the U-profile. Consequently, an increased bending force is required to bend the support strip into the U-profile.

[0006] The present invention is based on the objective of creating a reinforcing band and a shaped body that exhibit increased tensile strength and simultaneously improved bendability in the bent state.

[0007] To solve the problem, a reinforcing band with the features of claim 1 and a shaped body with the features of claim 13 are proposed.

[0008] Advantageous embodiments of the reinforcement band are the subject of the dependent claims.

[0009] According to one aspect of the invention, a reinforcing strip for insertion into a molded body made of an injectable compound is proposed.The reinforcing strip has a strip-shaped base body made of a metal, which has a plurality of widened slots and which is bendable into a U-profile with a base and two legs projecting from the base, wherein the base body has a first edge section, a second edge section and a central section arranged between the two edge sections, wherein a row of first slots is provided in each of the edge sections in the longitudinal direction of the strip, wherein a first row of second slots is provided in the central section in the longitudinal direction of the strip, wherein the first slots and the second slots are spaced apart from each other in the longitudinal direction of the strip and overlap in the transverse direction of the strip, such that the first slots and the second slots form neutral fibers between each other, and wherein the neutral fibers are arranged in the base in the bent state.

[0010] In the reinforcement strip according to the invention, the widened slots are incorporated into the base body in such a way that the first and second slots overlap in an area that forms the base after the base body is bent into a U-profile. This places the neutral fibers in the base of the U-profile. Consequently, the bending line along which the base body is bent runs at a distance from the neutral fibers, thus preserving the bending capability in all directions when bent. The reinforcement strip therefore exhibits improved bendability in the bent state, for example, when bent into a U-profile, while simultaneously maintaining high tensile strength. This makes it possible to reduce the thickness of the base body, since the neutral fibers in the base form tensile fibers that can withstand tensile forces even with a thinner material.

[0011] The reinforcing tape can also be referred to as an insert, inlay tape, scaffold tape, support tape or reinforcement.

[0012] The molded part can be a sealing strip, a decorative strip, or an edge protection strip for a vehicle, into which the reinforcing strip is embedded to strengthen the molded part. The injection-moldable compound can be a plastic and / or an elastomeric material.

[0013] The central section can be designed as a continuous web extending in the longitudinal direction of the strip. The first slots advantageously extend perpendicularly away from the web.

[0014] Advantageously, the base body can be bent into a U-profile along two bending lines extending in the longitudinal direction of the strip, with the edge sections being bent along these bending lines. Furthermore, it is advantageous for the bending lines to be spaced apart from the neutral fibers in the transverse direction of the strip and arranged in the edge sections.

[0015] In an advantageous embodiment, several rows of second slots are incorporated into the central section, wherein one row of second slots overlaps the first slots of the first edge section and another row of second slots overlaps the first slots of the second edge section in the transverse direction of the strip, forming a neutral fiber between them, and the rows of second slots arranged between them overlap in the transverse direction of the strip, forming a neutral fiber between them. Advantageously, enough second rows are arranged within the central section such that three to six neutral fibers are formed within the base between rows of first and / or second slots that overlap in the transverse direction and are spaced apart in the longitudinal direction of the strip.

[0016] In an advantageous embodiment, lamellae are formed between the first slots, with a ratio of the width of the central section to the width of a lamella of at least 4:1. From a ratio of 4:1 upwards, more tensile fibers can be accommodated in the base. This allows the strip thickness to be reduced, as the higher number of tensile fibers can absorb the tensile forces during extrusion and vulcanization, even with a thinner material.

[0017] In an advantageous embodiment, each lamella has a width between 2.5 mm and 1.5 mm, particularly 2 mm. This reduces the width of the second slots in the transverse direction of the strip, allowing the second slots to be located in the base and thus all neutral fibers to be accommodated in the base.

[0018] In an advantageous embodiment, the central section has a width of 9 mm or less. This dimension, together with the narrow width of the second slots in the transverse direction of the strip, makes it possible to accommodate several rows of second slots in the central section, thus increasing the number of neutral fibers in the base. As a result, the reinforcing strip exhibits higher tensile strength.

[0019] Advantageously, the width of the second slots in the transverse direction of the band is between 1 mm and 5 mm, in particular between 2 mm and 4 mm.

[0020] In an advantageous embodiment, the widened slots have an opening width between 0.1 mm and 4 mm. Furthermore, it is advantageous for the opening width of the slots to be between 0.5 mm and 1.75 mm.

[0021] In an advantageous embodiment, a second row with second slots is incorporated into the central section, wherein the second slots of the first and second rows are opposite each other in the longitudinal direction of the strip, wherein in the transverse direction of the strip the first slots of the first edge section overlap with the second slots of the first row and form a neutral fiber between them, wherein in the transverse direction of the strip the first slots of the second edge section overlap with the second slots of the second row and form a neutral fiber between them, and wherein the neutral fibers are arranged in the base when bent. By providing two rows with second slots, the reinforcing strip has three neutral fibers in the base and thus a high tensile strength, so that the material thickness of the base body can be reduced.

[0022] In an advantageous embodiment, a third row with second slots is incorporated into the central section between the first and second rows. In the longitudinal direction of the strip, the second slots of the third row are spaced apart from the second slots of the other two rows, and in the transverse direction of the strip, they overlap with the second slots of the other two rows, such that the second slots of the third row and the second slots of the other two rows each form a neutral fiber between them. In the bent state, the neutral fibers are located in the base. By providing three rows with second slots, the reinforcing strip has four neutral fibers in its base and thus a high tensile strength, allowing the material thickness of the base body to be reduced.

[0023] In an advantageous embodiment, the ribbon-shaped base body has a thickness between 0.1 mm and 0.6 mm, in particular between 0.3 mm and 0.5 mm, and furthermore in particular of 0.4 mm.

[0024] In an advantageous embodiment, the base body is bent into a U-profile. Advantageously, the base body has a base and two legs projecting from the base.

[0025] In an advantageous embodiment, the second slots are diamond-shaped. Alternatively, the second slots can be hexagonal, in particular symmetrically hexagonal.

[0026] In an advantageous embodiment, the first slots taper inwards to a point, wedge shape, or are rounded. Advantageously, the slots are open on the outside of the band, meaning that the slots do not have a closed border at the edges of the base body. Alternatively, the slots can be designed as openings with a closed border, meaning that the slots have a closed contour. The closed contour can be diamond-shaped, hexagonal, and / or oblong.

[0027] In an advantageous embodiment, the base body consists of a ductile metal, for example steel, aluminum or an alloy of steel or aluminum.

[0028] In an advantageous embodiment, the slots are produced in the base body by rotary cutting. Rotary cutting, also known as roll cutting or rotary cutting, involves creating slots in the base body using a rotating cutting wheel. Unlike stamping, rotary cutting produces no waste.

[0029] In an advantageous embodiment, the metal strip is smoothed across its entire width after cutting. Rotary cutting creates raised areas in the slots. The subsequent smoothing restores the original thickness of the metal strip.

[0030] In an advantageous embodiment, the slots are widened by stretching the base body. After slitting, the base body is stretched in the longitudinal direction of the strip, thereby lengthening it. This widens the slots into openings or penetrations. For example, stretching is achieved by lengthening or rolling.

[0031] According to a further aspect of the invention, a molded body made of an injectable molding compound is proposed, which has at least one reinforcing band according to the invention.

[0032] In an advantageous embodiment, the molded body is made of a plastic and / or an elastomeric material. The molded body can be produced by injection molding or extrusion. For this purpose, the reinforcing strip is formed into a U-profile, in particular bent, and then overmolded with a plastic or an elastomeric material. Advantageously, the plastic and / or the elastomeric material forms a coating.

[0033] In an advantageous embodiment, the shaped body is a decorative or sealing strip or an edge protection strip. The shaped body can have a sealing lip and a mounting channel for attaching the shaped body to a flange surrounding an opening. Advantageously, the insert, formed into a V-profile or a U-profile, is embedded in the receiving channel.

[0034] The following section explains a reinforcing band and its other features and advantages using an exemplary embodiment, which is schematically illustrated in the figures. This shows: Fig. 1. A top view of a reinforcing strip; Fig. 2 a perspective view of the reinforcing strip bent into a U-profile; Fig. 3 a top view of the U-profile; and Fig. 4 a side view of the U-profile.

[0035] In the Fig. 1, Fig. 2, Fig. 3 to Fig. Figure 4 shows a reinforcing strip 10, which serves to reinforce a molded body (not shown). The molded body can be a sealing strip for a vehicle (not shown), which has a sealing lip and a mounting shaft.

[0036] The reinforcing strip 10 has a band-shaped base body 12 made of a metal, for example steel, aluminium or an alloy of steel or aluminium, with a thickness between 0.1 mm and 0.6 mm, in particular between 0.3 mm and 0.5 mm, in particular 0.4 mm.

[0037] The ribbon-shaped base body 12 has a first edge section 14, a second edge section 16, and a central section 18 arranged between the two edge sections 14 and 16. The central section 18 has a width B. M less than or equal to 9 mm.

[0038] In the first edge section 14 and in the second edge section 16, B is each in the longitudinal direction of the band. L A row 20 with first slots 24 widened to form openings 22 is provided. The first slots 24 are separated from each other by a plurality of lamellae 26, which extend perpendicularly from the central section 18. Each of the lamellae has a width B LLbetween 2.5 mm and 1.5 mm, especially between 2 mm and 1.5 mm. This results in a ratio of width B. M of the central section 18 to the width B LL a lamella 26 of at least 4 to 1.

[0039] As in Fig. As can be seen in Figure 1, the first slots 24 extend from an edge 28 of the base body 11 in the band transverse direction B. Q inwards, with the first slots 24 of the two edge sections 14, 16 opposite each other. The first slots 24 are open to the outside and wedge-shaped to the inside.

[0040] In the central section 18, a first row 30 with second slots 32, a second row 34 with second slots, and a third row 36 with second slots 32 are provided. The second slots 32 of the rows 30, 34, and 26 are widened into diamond-shaped, closed openings 22, as shown particularly in the Fig. 1 and Fig. 3 is evident.

[0041] The first slots 24 and the second slots 32 are produced by rotary cutting or punching and by stretching, that is, by pulling the base body 12 in the longitudinal direction of the strip B. L , for example by means of rolling mills into which in Fig. The shape shown in Figure 1 is widened. The opening width of the slots 24, 32 can be between 1 mm and 4 mm.

[0042] According to Fig. 1 The second slots 32 of the first row 30 and the second slots 32 of the second row 34 lie in the band transverse direction B. Q spaced apart from each other and are in the longitudinal direction of the belt B L offset from the first slots 24 and the second slots 32 of the third row 36.

[0043] The second slots 32 of the third row 36 are between the first slots 24 and in the band transverse direction B QThe slots 24 are spaced apart from the first slots. This means that the second slots 32 of the third row 36 are aligned with the second slots 32 of the first row 30 and the second row 34 in the longitudinal direction of the belt B. L spaced apart and in the transverse direction of the belt B Q displaced.

[0044] As also in Fig. As can be seen in Figure 1, the first slots 24 overlap with the second slots 32 of the first row 30 and the second row 34 in the band transverse direction B. Q and the second slots 32 of the first row 30 and of the second row 34 overlap with the second slots 32 of the third row in the band transverse direction B Q Between the overlapping slots 24, 32, webs 38 made of the same material as the base body 12 are formed. The webs 38 between the overlapping slots 24, 32 are arranged periodically in the longitudinal direction B of the strip. Larranged. This creates a neutral fiber 40 between the overlapping slots 24, 32, which runs in the longitudinal direction B of the strip. L The neutral fibers 40 absorb the tensile forces acting on the reinforcement band 10.

[0045] Due to the ratio of width B M of the central section 18 to the width B LL of a lamella 26 of at least 4 to 1, four in the longitudinal direction of the band B L The neutral fibers 40 running in the middle section 18 are formed, as in the Fig. 1 and Fig. 3 is evident.

[0046] To reinforce the molded body, the in Fig. 1. The reinforcement strip 10 shown is bent into a U-profile 42 by bending the edge sections 14, 16 along a bending line B, as shown in the Fig. 2, Fig. 3 to Fig. 4 is evident. Subsequently, the U-profile 42 is overmolded with an injection-moldable compound, for example a plastic or an elastomer, using an extrusion process.

[0047] The U-profile 42 has a base 44 and two legs 46 projecting from the base 44. As shown in particular in Fig. As can be seen in section 1, the bending lines B run in the longitudinal direction of the strip B. L parallel to the neutral fibers 40, wherein the bending lines B in the transverse direction of the strip B QThe neutral fibers are spaced apart from the outer neutral fibers. As a result, all neutral fibers 40 of the U-profile 42 are located in the base. This means that the U-profile 42 retains its flexibility in all directions and can also withstand higher tensile forces, for example, during extrusion. Thus, the reinforcing strip 10, when bent into the U-profile 42, exhibits improved flexibility combined with high tensile strength. Furthermore, it is possible to reduce the thickness of the base body 12, since the large number of neutral fibers 40, which form tensile fibers in the bent state, can absorb the tensile forces even with a thinner material. Reference symbol list 10 Reinforcement band 12 basic shapes 14 first marginal section 16 second marginal note 18 Middle section 20th row 22 Opening 24 first slots 26 lamellae 28 rand 30 first row 32 second slots 34 second row 36 third row 38 Bridge 40 neutral fiber 42 U-profile 44 base 46 thighs B L Belt longitudinal direction B Q Band cross-direction B LL Wide slats B M Broad central section B bending line QUOTES INCLUDED IN THE DESCRIPTION

[0000] This list of documents cited by the applicant was automatically generated and is included solely for the reader's convenience. The list is not part of the German patent or utility model application. The DPMA accepts no liability for any errors or omissions. Cited patent literature

[0000] DE 10 2014 010 822 U1

[0005]

Claims

Reinforcing strip (10) for insertion into a molded body made of an injection-moldable compound, comprising a strip-shaped base body (12) made of a metal, which has a plurality of widened slots (24; 32) and which is bendable to form a U-profile (42) with a base (44) and two legs (46) projecting from the base (44), wherein the base body (12) has a first edge section (14), a second edge section (16) and a central section (18) arranged between the two edge sections (14, 16), wherein a row (20) with first slots (24) is provided in each of the edge sections (14, 16) in the longitudinal direction (BL), wherein a first row (30; 34;36) is provided with second slots (32), wherein the first slots (24) and the second slots (32) are spaced apart from each other in the longitudinal direction (BL) of the strip and overlap in the transverse direction (BQ) of the strip, so that the first slots (24) and the second slots (32) form neutral fibers (40) between each other, and wherein the neutral fiber (40) is arranged in the base (44) in the bent state. Reinforcing strip according to claim 1, characterized in that lamellae (26) are formed between the first slots (24), wherein the ratio of width (BM) of the central section to the width (BLL) of a lamella (26) is at least 4 to 1. Reinforcing tape according to claim 2, characterized in that each lamella (26) has a width (BLL) between 2.5 mm and 1.5 mm, in particular 2 mm. Reinforcing tape according to one of the preceding claims, characterized in that the central section (18) has a width (BM) less than or equal to 9 mm. Reinforcing tape according to one of the preceding claims, characterized in that a second row (34) with second slots (32) is provided in the central section (18), wherein the second slots (32) of the first row (30) and the second row (34) are opposite each other in the longitudinal direction (BL) of the tape, wherein in the transverse direction (BQ) of the tape the first slots (24) of the first edge section (14) overlap with the second slots (32) of the first row (30) and form a neutral fiber (40) between them, wherein in the transverse direction (BQ) of the tape the first slots (24) of the second edge section (16) overlap with the second slots (32) of the second row (34) and form a neutral fiber (40) between them, and wherein the neutral fibers (40) are arranged in the base (44) in the bent state. Reinforcing tape according to claim 5, characterized in that a third row (36) with second slots (32) is provided in the central section (18) between the first row (30) and the second row (34), wherein in the longitudinal direction (BL) of the tape the second slots (24) of the third row (36) are spaced apart from the second slots (32) of the other two rows (30, 34) and overlap in the transverse direction (BQ) of the tape with the second slots (32) of the other two rows (30, 34), so that the second slots (32) of the third row (36) and the second slots (32) of the other two rows (30, 34) each form a neutral fiber (40) between them, and wherein the neutral fibers (40) are arranged in the base (44) in the bent state. Reinforcing band according to one of the preceding claims, characterized in that the band-shaped base body (12) has a thickness between 0.1 mm and 0.6 mm, in particular between 0.3 mm and 0.5 mm, and furthermore in particular of 0.4 mm. Reinforcing band according to one of the preceding claims, characterized in that the base body (12) is bent into a U-profile (44). Reinforcing tape according to one of the preceding claims, characterized in that the second slots (32) are diamond-shaped. Reinforcing band according to one of the preceding claims, characterized in that the first slots (24) taper inwards in a pointed, wedge-shaped and / or rounded manner. Reinforcing band according to one of the preceding claims, characterized in that the base body (12) consists of a ductile metal. Reinforcing tape according to one of the preceding claims, characterized in that the slots (24; 32) are provided in the base body (12) by rotary cutting. Reinforcing band according to one of the preceding claims, characterized in that the slots (24; 32) are widened by stretching the base body (12). Molded body made of an injectable molding compound, comprising at least one reinforcing band (10) according to one of claims 1 to 13 .

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