RU214002U1 - PROTECTIVE PROPERTIES - Google Patents

Abstract

The utility model is designed to protect the ribs and adjacent sections of the end and cylindrical surfaces of the inner cylindrical opening of the product, as well as packaging elements, from mechanical damage. The technical result consists in increasing the convenience of the packaging process and is achieved due to the fact that the protective props are made of an elastic material, contain a glass in the form of an open hollow cylinder and a flange monolithically combined with it, containing a plurality of periodically alternating thin sections radially located in the flange plane. 12 w.p. f-ly, 3 ill.

Description

The utility model relates to packaging products and is designed to protect the ribs and adjacent sections of the end and cylindrical surfaces of the cylindrical opening of the product, such as a roll of flat metal, a bearing housing, etc., as well as packaging elements, from mechanical damage.

Protective props are used for packing massive (approximately up to 20 tons) and, accordingly, overall products, the inner diameter of which is approximately 200-1500 mm. When carrying out loading and unloading operations, transportation and storage, various mechanical effects on them may occur. The proposed props can be used as an independent element or as part of a complex product packaging.

Known cardboard protective corners of the Klin Carton Packing Plant (http://upaktara.ru/product/u6.html), plastic corners of Metallurgpribor LLC (http://metallurgpribor.com/), packing corner, (RU144247, IPC V65D81/02, published 2014.08.17). All of these corners are designed to protect the ribs and adjacent parts of the surfaces of the products from damage.

For installation on a cylindrical surface, one of the shelves of these corners has a perforation (notches) in the form of transverse cuts. The presence of perforation sharply reduces the bending rigidity of the corner, as a result, the corner is poorly fixed in the inner hole of the product.

This disadvantage is eliminated in the well-known (RU patents No. 160761, 158345, 169453, 2496706) modifications of protective inserts of the same type to the prototype below, which are installed in the inner hole of the protected product with a certain range of possible diameters. To this end, the protective inserts have devices for adjusting the diameter and means for connecting the ends of the insert.

The closest set of essential features to the claimed utility model is the known adjustable insert (patent RU 160761 U1, IPC V65N75/24, publ. 2016.03.27), taken as a prototype, made of an elastic material and intended for insertion into an object having a cylindrical cavity, made in such a way that it is possible to adjust its diameter contains an annular sleeve and a flange extending radially outward from the cylindrical surface of the specified sleeve, while the said sleeve and flange are open. The adjustable liner has the ability to change the outer diameter of the cup in two ranges: from 580 mm to 615 mm and from 610 mm to 625 mm. Thus, the total range of possible change in the outer diameter of the cup is ± 3.75% of the standard inner diameter of a steel coil of 600 mm.

The flange specified as a prototype of the adjustable liner contains a flexible part that facilitates the possibility of adjusting the diameter, including at least one section made with the possibility of radial tension-compression. To enable stretching-compression, this section/sections are corrugated, for example, wavy. The corrugated sections are located radially on the flange and can be made with a smaller thickness than the rest of the flange. The possibility of tension-compression of the flexible part of the flange is provided by bending deformations of the corrugated part. The presence of flexible parts significantly reduces the bending stiffness of the adjustable liner. In addition, the adjustable insert contains adjustable connection means (groove-rod) located at different ends of the sleeve and/or flange, and a protrusion-recess connecting pair located at different ends of the flange and/or sleeve. It should be noted that the use of adjustable connection means is mainly possible using the flexible part of the flange. Otherwise, the flexural rigidity of the insert will be too high, which will significantly complicate the operation of the adjustable connection. Thus, the main disadvantage of the known adjustable insert is: the difficulties that arise when installing it in the inner hole of the product, due to the need to fix its two ends with the help of appropriate connecting means. In addition, the presence of a corrugated flexible part/parts and means of interaction complicates the design of the adjustable liner, and can also provoke a rupture of the anti-corrosion material when packaged with protruding parts of the flexible part of the flange and/or adjustable connection means.

At the enterprises there are certain standard sizes of internal diameters of manufactured products. For example, in steel mills, flat steel coils typically have an inside diameter of 480 mm to 850 mm. At the same time, at each specific limit (site) of production, protective props with one specific diameter size are usually required. Known adjustable bushings do not provide the ability to adjust the diameter in the specified range. It is more convenient for each consumer to have protective props of a specific required diameter.

However, the actual dimensions of product diameters may differ from the nominal values (use of multi-layer packaging, bending of the first metal coil, etc.). Therefore, to install a protective accessory in the hole of the protected item, it is necessary to provide the possibility of changing the diameter of the protective accessory cup.

The objective of the utility model is to develop a reliable design of protective props with a high level of product protection.

The technical result obtained in the implementation of the utility model is to increase and improve the convenience of the packaging process by simplifying the design of the protective requisite: the exclusion of the flexible part/parts of the flange and adjustable connection means and, consequently, the need to connect the ends of the requisite.

The specified technical result is achieved due to the fact that in the protective props made of an elastic material containing a cup in the form of an open hollow cylinder and extending radially outward from the generatrix of the cup surface, a flange monolithic-combined with it with radially located thin sections, thin sections are located in the plane of the flange and form a set of periodically alternating thin sections.

When performing thin sections in the same plane with the plane of the flange, tensile deformations occur, mainly thin sections. The maximum deformations occur at the outer diameter of the flange, gradually decreasing towards its inner diameter. Tensile deformations of the flange cause bending deformations (along the entire perimeter of the inner diameter of the flange), which change the angle in cross section between the flange plane and the generatrix of the nozzle surface. With bending deformations, the rigidity is proportional to the fourth power of the section dimensions (in the direction of the bending moment). The ratio of elastic tensile/bending deformations will depend on the geometric dimensions of the protective props and the material from which it is made. This design provides a sufficiently high bending rigidity of the protective props for its reliable fixation in the opening of the protected product due to the elastic forces.

Obviously, with specific technical implementations, the planes of thin sections cannot exactly coincide with the plane of the flange. Preferably, when the deviation of the plane of the thin section from the plane of the flange does not exceed ± 15°. In this case, all parameters of the protective props are saved.

The areas of elastic deformations of the stretching of solids are relatively small. In addition, it is necessary to ensure the uniformity of stresses around the entire perimeter of the flange. Therefore, it is necessary to use the maximum possible (from the point of view of practical implementation) number of periodically alternating thin sections. The number of thin sections on the flange must be large enough to ensure uniform distribution of stresses arising in the protective accessory as a result of its bending (diameter reduction) before installation into the inner hole of the protected product, and residual deformations remaining in the protective accessory after its installation. The transition from the thickness of the flange to the thickness of the thin section is preferably performed without kinks by smooth bends.

With the same nominal values of the diameters of the holes of the protected products, their actual values may vary. The proposed design of the protective requisite allows it to be used when the diameters of the product holes deviate by ± 5% from the nominal value due to elastic deformations of the protective requisite (stretching-bending)

Thin sections in the plane of the flange can be in the form of a triangle with a base located on the outer diameter of the flange, or a trapezoid with a large base located on the outer diameter of the flange, which makes it possible to ensure the average thickness of the flange near the edge of the protected product is maximum, and on the outer radius of the flange - minimum. As a result, with the same material consumption of the protective props, the thickness of the flange increases in the region of the most traumatic zone - the edge of the protected product and adjacent sections of the end and cylindrical surfaces. In addition, the location of thin sections in the same plane with the plane of the flange (there are no corrugated flexible parts) and the absence of protruding means of connection reduces the risk of injury to the anti-corrosion material (increase in the level of protection of the product against corrosion) with complex packaging. An increase in the level of protection of products from mechanical damage is achieved by increasing the thickness (ceteris paribus) of the protective props in the most traumatic areas adjacent to the edge of the protected product.

The width (a) of the flange is determined by the required level of protection of the product and the requirements for the end surface of the protected product; the width of the flange (a) is usually chosen from the range of 20-150 mm. Accordingly, the width (a) of the flange, equal to 20-40 mm, is used with the minimum possible impact on the protected product and low requirements for its end surface. The most common are flange widths (a) from 40 mm to 80 mm. A flange with a width of (a) (80-150) mm is usually used for cases where protection of the end surface area adjacent to the inner hole of the product is required.

The thickness (d2) of the flange is mainly determined by the required level of impact protection of the product and is selected from a range of 1.2 to 8.0 mm. With minimal impacts, for example, intra-shop and / or intra-factory movements of products, an internal element of multi-layer packaging, small shipment shoulders by covered vehicles, etc., it is recommended to use protective props with minimum thicknesses (d2) of the flange from 1.2 mm to 3.0 mm (usually 1.5-2.5 mm). When using a protective accessory as an independent element of a package or an external element of a multilayer package, the thickness (d2) of the flange is selected in the range of 3-6 (mm). For long-distance shipments of products using several modes of transport, the thickness (d2) of the flange can be increased up to 8 mm. As a rule, this thickness (d2) of the flange is sufficient to provide the required level of protection under the most severe conditions.

The thickness (d3) of the thin section of the flange is usually 1.5-3 times less than the thickness (d2) of the flange and is in the range from 0.6 to 5.0 mm. With thicknesses (d3) of the thin section of the flange less than 0.6 mm, the props have too low strength properties (for example, tensile strength) for use in the conditions under consideration. With thicknesses (d3) of the thin section of the flange of more than 5 mm, the protective requisite, on the one hand, is too rigid for installation in the hole, on the other hand, this thickness value (d3) of the thin section of the flange is sufficient to dampen possible shocks and provides other required strength parameters .

Dimension (c) of the gap between thin sections, measured from the outside diameter of the flange 0-30 mm. The dimension (b) of the thin section, measured from the outer diameter of the flange, must be less than the size of the possible impact on the protective property and is usually 5-50 mm.

The shape of a thin section in a transverse (perpendicular to the plane of the flange) section along the circumference of the flange can be flat, concave or convex, which is determined by the technological features of the production of protective props and possible influencing factors.

In the plane of the flange, thin sections may have the form of a triangle with a base located on the outer diameter of the flange. Usually thin sections are used, made in the form of isosceles triangles, but other options can be used.

To reduce stress, the top of the triangle adjacent to the inner diameter of the flange is recommended to be rounded with a radius of 1-10 mm.

In the plane of the flange, thin sections can be made in the form of a trapezoid, the larger base of which is located on the outer diameter of the flange. We recommend connecting the smaller base of the trapezoid with the sides along the radius.

The repetition period (T) of thin sections, measured by the inner diameter of the flange, is 5-100 mm and is determined mainly by the diameter of the inner hole of the protected product and the properties of the material of the protective props.

The outer diameter of the glass is chosen as follows.

BUT). In case of intra-shop/intra-factory movements of products, the protective props, after being installed in the hole, are usually fixed with one strapping tape. Protective props must be confidently held in the hole with possible influencing factors that can push it out of the hole until the end of the movement of the product. In this case, it is recommended to choose the outer diameter of the cup 3-10% larger than the inner diameter of the product to be protected.

B). With partial packaging, with the protection of the most vulnerable parts of the product, a limited number of packaging elements are used, for example, protective props and a corner on the edge of the outer diameter of the metal roll. Once the security prop is installed in the inner hole of the product, the possible impacts on the security prop that can push it out of the hole are minimal. The whole structure is pulled together with several strapping tapes. For such cases, we recommend using packaging props with an outer diameter of the glass equal to or slightly less than the diameter of the inner hole of the product.

AT). With complex, multi-layer packaging, for example, a roll of steel, the outer diameter of the protective props cup depends on the packaging scheme used. Protective props can be installed directly on steel coils. The outer diameter of the cup in this case is determined by the inner diameter of the roll opening and possible irregularities of the first turn. If the unevenness of the first turn is minimal, we recommend choosing the outer diameter of the cup 1-5% larger than the diameter of the inner hole of the roll. If the irregularities of the first turn are significant, the diameter of the glass should be reduced accordingly. In the case of installing a protective prop outside the layers of the package, the outer diameter of the cup of the protective prop is chosen taking into account the actual change in the diameter of the inner hole of the roll. This takes into account the value of the inner diameter of the roll with the corresponding layers of packaging before tightening the packed roll with strapping tapes and the value of the inner diameter of the packed roll after tightening with strapping tapes.

After installing the protective requisite in the inner hole of the protected product, the ends of the protective requisite may overlap, butt, or not reach each other. For most applications, a lap joint is recommended. The overlap is usually between 20 mm and 150 mm.

The design of protective props, when its ends do not reach each other, is usually used in packaging schemes with partial protection of products only in the most traumatic places (for example, roll edges). The size of the uncovered part (the distance between the ends of the protective props) is recommended to be no more than 100 mm.

The wall thickness (d1) of the cup is selected from the range of 1.2-8.0 mm, taking into account possible effects on the protective props. For internal movements of the product and the use of protective props as an internal element of multilayer packaging, we recommend using the wall thickness (d1) of the cup from 1.2 mm to 3.0 mm. When using security props as an independent element of a package or as an external element of a multilayer package, a cup with a wall thickness (d1) of 3.0 mm to 6.0 mm is usually chosen (the most common thickness is 4-5 mm). To protect products with very small values of bending deformations in order to avoid the appearance of "pressures", for example, on thin-sheet flat products (0.2-0.4 mm), the wall thickness (d1) of the protective props cup can be increased to 8 mm.

The height (h) of the glass affects the level of protection of the product and the force holding the protective props in the hole is selected from the range from 30 mm to 200 mm. Therefore, the minimum dimensions (h) (30-50) mm are recommended for the minimum diameters (200-400 (mm)) of the internal openings of the protected products with minimal impacts pushing out the protective props and a minimum level of protection. The most common dimensions are height (h) from 50 mm to 120 mm. Protective props with a height of cups (h) 120-200 mm are used under difficult conditions for the movement of goods and / or to protect the delicate forming surfaces of the inner opening of the product.

The distance (e) from the outer surface of the sleeve generatrix to the beginning of the thin section of the flange is usually between 0.5 mm and 15 mm.

The cross-sectional angle between the flange plane and the generatrix (outer side surface) of the sleeve is recommended to be selected from the range of 80-95°, preferably 85-89°. The transition from the flange plane to the generatrix of the sleeve surface is recommended to be performed along a radius of usually 2-10 mm, which allows to reduce the stress in this area.

To install the protective props in the hole of the protected product, it is necessary to bend it with your hands, reducing the diameter, then install it in the hole and release it. In this case, the protective props (glass) are fixed in the opening of the protected product due to the elastic forces.

In the case of using props as part of complex packaging, it must be confidently held in the inner opening of the protected product due to elastic forces until the end of the packaging process. When props are used for intra-factory / intra-shop movements of the roll, it can be used as an independent protective element and fixed with one strapping tape. In this state, it must be held in the opening of the roll until the end of its movement.

The force holding the prop in the hole is proportional to its bending rigidity and the amount of deformation of the protective prop in the event of buoyancy. The bending rigidity of a protective prop is determined by its geometric dimensions and the material from which it is made. The amount of deformation of the protective props depends on its geometric dimensions and is mainly determined by the diameter of the outer generatrix of the glass and the height (h) of the glass. Thus, it becomes possible to obtain the required value of the force holding the protective props in the hole of the protected product, which makes it possible to eliminate the need for connection means and, therefore, simplify the packaging process.

When choosing a material for the manufacture of protective props, it should be taken into account that differences in the physical and mechanical properties of materials can be largely compensated by changing the geometric dimensions of the props, which allows optimizing technical and economic indicators.

The preferred material for the manufacture of protective props are thermoplastics. The most widespread are polyethylenes, polypropylenes, polyvinyl chlorides, polystyrenes, polyesters, ABC plastics and others. Elastomers are mainly used for harsh conditions of transportation and storage. Both unsaturated and saturated rubbers can be used, for example, polypropylene, ethylpropylene, ethylene vinyl acetate and others.

In order to optimize the costs for the production of packaging elements with the provision of specified requirements for their physical and mechanical properties, mixtures of thermoplastics or mixtures of elastomers, or mixtures of thermoplastics with elastomers can be used as a material for their manufacture. In addition, it is possible to use secondary raw materials. Thermoplastics are used quite rarely, mainly for remote deliveries, in the case when the secondary processing of raw materials is impractical.

In order to improve the properties and / or optimize the production process, appropriate additives can be introduced into materials for the manufacture of protective props: dyes; antimicrobial, antibiotic; antioxidants; flame retardants; antistatic agents; antifriction additives; blowing agents, etc.

To change the properties and / or reduce the cost of the protective props material, materials consisting of polymeric raw materials and fillers can also be used, the most common of which are: wood flour, chalk, talc, asbestos, fiberglass, graphite, cotton fabric, paper, etc. .

Mixtures of polymers with additives and fillers, including secondary materials, can also be used.

It is possible to use polymer-containing materials in which polymers are used as a binder. It can be fibrous, layered, layered-fibrous, bulk and other materials. Materials with a polymer laminating layer and/or multilayer materials using polymers as a binder between the layers can also be used.

Protective props can be made of monolithic or foamed material. Typically, foam material with a density of 200 kg/m³ and above is used.

A corrosion inhibitor or inhibitors can be introduced into the material from which the protective props are made and/or into the laminating layer.

Protective props can be made laminated, which allows branding the product (colors, inscriptions, logos, etc.) and/or enhancing its protective properties.

Protective props can be made by injection molding, rolling, molding, etc.

The device works as follows.

During movement and storage, mechanical effects on the protected product can occur as a result of interactions, for example: a load gripping device - a protected product, a protected product - a protected product, a protected product - a fixed obstacle. During loading and unloading operations, mechanical effects occur mainly as a result of careless work of load-handling mechanisms. When transporting a protected product, mechanical impacts can occur as a result of sudden braking, when cars are lowered from a hill, as a result of loosening of cargo fastening. In all these cases, the packaging of the protected product and the product itself will be affected by forces that cause a complex of elastic-plastic deformations of compression-rupture-tear.

With the same impact forces on the protected product, the edge of the product has a minimum area. Under shock effects, the greatest pressure occurs on the ribs of the products and on the parts of the surfaces of the product immediately adjacent to them (about 10 mm from the rib). From mechanical influences, the end and forming surfaces of the protected products are protected by the corresponding elements of the complex packaging: end disks, sheets, etc., used as needed.

It should also be taken into account that the considered protective props are not load-bearing, belong to the elements of flexible protective packaging and, therefore, work together with the protected product and other packaging elements (as part of complex packaging). In the event of a mechanical impact on the packaging, the protective props deform elastoplastically, damping the impact. The parameters of the protective props (material and geometric dimensions) are chosen so as to avoid through breakdowns of the package and deformation of the protected product.

It is also necessary to ensure a tight fit of the protective props to the product, which will reduce the likelihood of tear-tear forces and / or reduce the magnitude of these forces.

When using protective props as an independent element of packaging, we recommend choosing its elastic modulus slightly less than the reduced modulus of elasticity of the protected product. When using a protective prop as part of a complex package, respectively, it is somewhat less than the reduced modulus of elasticity of the packaged product.

The required level of product protection is chosen taking into account the value of the cargo, packaging costs, the size of the transport chain, the conditions for transporting and storing cargo, etc. For example, when cargo is transported by covered vehicles over a distance of up to 1000 km, minimal impacts on the cargo should be expected. The maximum impacts will occur when the cargo is moved by several modes of transport. For example, loading into railway wagons at the manufacturer, delivery to the port, unloading at a warehouse in the port, loading onto a ship, transporting cargo by sea, unloading at the port of destination, loading onto a road or railway. transport, unloading at the recipient. Therefore, the required level of protection for the same products for different transport chains may differ by an order of magnitude. Therefore, when choosing the material and specific parameters of the protective props, they are guided by the existing experience in the use of protective packaging and the required level of product protection. Determining the compliance of the material and geometric dimensions with the technical requirements for protective props can be carried out in laboratory conditions at the appropriate stands. In this case, fragments of protective props can be used. Determining the tightness of the fit of the protective props and the convenience of packaging is usually carried out on real products.

For maritime transportation and/or long shipping arms (more than 2000 mm), in order to increase the level of anti-corrosion protection of the package, an appropriate inhibitor or a complex of corrosion inhibitors is introduced into the material of the protective props. In cases where the protective props are laminated, the corrosion inhibitor/inhibitors are added to the laminating layer. As corrosion inhibitors, compositions of contact and volatile corrosion inhibitors are usually used, but volatile and contact corrosion inhibitors can also be used separately. Contact corrosion inhibitors are generally effective in protecting simple shaped items (cylinder, parallelepiped, etc.) when the anti-corrosion material is in contact with the surface of the item. Volatile corrosion inhibitors are especially effective in protecting complex shapes or cavities, such as pipes, containers, etc. The most widespread for use in packaging anticorrosion materials are compositions of corrosion inhibitors, which can simultaneously combat corrosion by both contact and volatile methods. The use of these inhibitor compositions is especially effective in the protection of multilayer products, for example, rolls. The most widespread in the composition of metal corrosion inhibitors are: aliphatic, aromatic, heterocyclic, cyclic amines, their derivatives and salts; guanidine, its derivatives and salts; imines, their derivatives and salts; amides and azides; morpholine, its derivatives and salts; amino alcohols, their derivatives and salts; esters; carboxylic acids and amino acids; salts of carboxylic acids; sulfur and phosphorus-containing compounds; nitro compounds; mixtures based on sodium nitrite; derivatives of polyhydric alcohols and phenol. Other substances and compounds that are metal corrosion inhibitors can also be used. Corrosion inhibitors are often formulated with additional substances to enhance their effect or to allow different substances to work together. Also, surfactants, absorbers of oxygen, moisture and other substances aimed at protecting metal products from corrosion can also be used with corrosion inhibitors.

Protective props can be made by injection molding, pressing, rolling, molding.

The proposed protective props are widely used in the packaging of massive products with a cylindrical hole.

To clarify the essence of the utility model, the following graphic materials are presented:

fig. 1 - axonometric image of a protective prop with ends that do not reach each other;

fig. 2 - top view of the protective props, with overlapped ends;

figure 3 is a side view of the protective props.

Evidence of the possibility of implementing the utility model is presented on the example of a specific design of protective props (Fig. 1). The protective props contain a cup 1 in the form of an open hollow cylinder and a flange 2 monolithically aligned with it, extending outward from the generatrix of the cup 1. On the flange 2, radially located thin sections 3 are made, which are in the same plane with the plane of the flange.

The main parameters of the protective props:

made of a polymeric material or a mixture of polymeric materials, possibly with appropriate additives, including dyes;

can be made using polymeric material/materials and fillers;

thin sections 3 in the plane of the flange 2 can be made in the form of a triangle or a trapezoid;

the repetition period (T) of thin sections 3, measured by the inner diameter of the flange 2 is from 5 mm to 100 mm;

thickness (d1) of the wall of the cup 1 is from 1.2 mm to 8.0 mm;

thickness (d2) of flange 2 varies from 1.2 mm to 8.0 mm;

thickness (d3) of thin sections 3 is 0.6 mm - 5.0 mm;

the width (a) of the flange 2 is 20 mm to 150 mm;

the height (h) of the cup 1 is from 30 mm to 200 mm;

the size (c) of the gap between thin sections 3. measured by the outer diameter of the flange 2. is selected in the range of 0-30 mm;

the dimension (b) of the thin section 3, measured by the outer diameter of the flange 2, is 5-70 mm;

may contain corrosion inhibitor(s) embedded either in the material of the security props or in the laminating layer.

After installation in the inner hole, the protective props close the edge of the inner hole of the protected product, the cup 1 of the protective props protects the section of the cylindrical surface of the inner hole of the product by the value (h) of the height of the cup 1, and the flange 2 - the area adjacent to the inner hole of the end surface of the product by the width (a) flange 2.

Claims (13)

1. Protective props made of an elastic material, containing a cup (1) in the form of an open hollow cylinder and extending radially outward from the generatrix of the cup surface, a flange (2) monolithically aligned with it with radially located thin sections (3), which differs the fact that the thin sections (3) are located in the plane of the flange (2) and form a plurality of periodically alternating sections. 2. Protective props according to claim 1, characterized in that thin sections (3) have the shape of a triangle, the base of which is located on the outer diameter of the flange (2). 3. Protective props according to claim 1, characterized in that the thin sections (3) of the plane of the flange (2) are in the form of a trapezoid, the larger base of which is located on the outer diameter of the flange (2). 4. Protective props according to claim 1, characterized in that the repetition period (T) of thin sections (3), measured along the inner diameter of the flange (2), is from 5 mm to 100 mm. 5. Protective props according to claim 1, characterized in that the thickness (d1) of the wall of the cup (1) is from 1.2 mm to 8.0 mm. 6. Protective props according to claim 1, characterized in that the thickness (d2) of the flange (2) is between 1.2 mm and 8.0 mm. 7. Protective props according to claim 1, characterized in that the thickness (d3) of thin sections is from 0.6 mm to 5.0 mm. 8. Protective props according to claim 1, characterized in that the width (a) of the flange (2) is between 20 mm and 150 mm. 9. Protective props according to claim 1, characterized in that the height (h) of the glass (1) is from 30 mm to 200 mm. 10. Protective props according to paragraphs. 1-9, characterized in that it is made of a polymeric material/materials. 11. Protective props according to claim 10, characterized in that the material additionally contains fillers. 12. Protective props according to paragraphs. 1-9, characterized in that it is made of a polymer-containing material/materials. 13. Protective props according to paragraphs. 1-9, characterized in that the material additionally contains a corrosion inhibitor/inhibitors.

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