Protective helmet

Abstract

The invention relates to a protective helmet 2 comprising a helmet shell 4 and a support frame 10. The support frame 10 comprises a fastening crown 12. The fastening crown 12 is fixed to an inner side 5 of the helmet shell 4 or is formed as a component of the inner side 5 of the helmet shell 4. The support frame 10 further comprises at least one stiffened leg element 20. The leg element 20 extends freely from the fastening crown 12 toward a lower edge 6 of the helmet shell of the protective helmet 2.

Description

[0001] The invention relates to a protective helmet.

[0002] Safety helmets are worn in a wide variety of professions and activities. For example, various types of safety helmets are used by police officers, firefighters, soldiers, and mountain rescuers. Safety helmets are also used in many sports, for example, as bicycle helmets or riding helmets.

[0003] The primary function of a safety helmet is usually to protect the head. A significant danger to the wearer is, among other things, impacts to the head, for example, caused by falls or objects striking the helmet. To mitigate the negative consequences of such impacts, safety helmets often include padding and shock-absorbing elements designed to absorb the impact. However, such shock-absorbing elements are often bulky and reduce comfort for the wearer.

[0004] In addition, other helmet components and accessories such as ear protectors, headphones, protective nets and the like are often arranged inside the helmet in addition to shock absorption elements.

[0005] The object of the invention is to provide a protective helmet which has a high level of safety, attachment options for helmet accessories and a high level of wearing comfort.

[0006] This object is achieved by a protective helmet comprising a helmet shell and a support frame, wherein the support frame comprises an annular fastening crown, which is fixed to an inner side of the helmet shell or is formed as a component of the inner side of the helmet shell, wherein the support frame comprises at least one stiffened leg element, wherein the leg element extends free-standing from the fastening crown in the direction of a lower edge of the helmet shell of the protective helmet.

[0007] The support frame, which is fixed to the helmet shell by means of the fastening crown, provides a fastening option for helmet components and helmet accessories on the inside of the helmet without the helmet shell being weakened by drilling. Fastening to the inside of the helmet shell by means of a hook and loop fastener, as is often the case for shock absorption pads, is also no longer necessary. In contrast to fastening by means of a hook and loop fastener, helmet accessories and helmet components can be securely and firmly attached to at least one leg element. In particular, the fastening crown is fixed directly or indirectly to the inside of the helmet shell. For example, the fastening crown is glued directly to the inside of the helmet shell or fastened to an intermediate layer which is fixed to the inside of the helmet shell. It can also be provided that the fastening crown is formed directly as part of the helmet shell.This can be the case, for example, with an injection-molded helmet shell.

[0008] The fastening crown is annular and thus forms a ring with a central recess. The ring is, in particular, closed. Alternatively, the ring has at least one interruption, making it an open ring. The ring is not necessarily circular, but can also have other shapes, e.g., elliptical or polygonal. In particular, the fastening crown comprises several corners along the ring.

[0009] The at least one leg element extends, starting from the fastening crown, in a free-standing manner toward the lower edge of the helmet shell. The term free-standing refers in particular to the fact that the leg element is not fixed to the helmet shell. Except indirectly via the fastening crown, the leg element is not connected to the helmet shell. The at least one leg element is fixed to the fastening crown, in particular, by means of a locking bracket. In particular, the holding length of the leg element, by which the leg element protrudes toward the lower edge of the helmet shell, can be varied. This allows the height of elements and components attached to the leg element to be adjusted.

[0010] Preferably, the fastening crown is fixed directly to a textile layer, wherein the textile layer is fixed to the inside of the helmet shell. In this embodiment, the fastening crown is thus fixed indirectly via the textile layer to the inside of the helmet shell. The textile layer extends, in particular, over the inside of the helmet shell. In particular, the textile layer is pressed into the helmet shell. In particular, the fastening crown is fixed to a front side of the textile layer. A back side of the textile layer is fixed, in particular, to the helmet shell.

[0011] Preferably, the fastening crown is sewn to the textile layer. This ensures a secure and durable fixation of the support frame to the helmet shell. During production of the protective helmet, the fastening crown is first sewn to the textile layer before the textile layer is pressed into the helmet shell. In particular, the fastening crown is sewn and pressed indirectly via the textile layer onto the inside of the helmet shell and / or glued to the inside of the helmet shell and / or at least partially incorporated into the inside of the helmet shell. The advantage of sewing or incorporating the fastening crown into the helmet shell is that the support frame is already connected to the helmet shell during production and adheres firmly to the helmet shell.

[0012] A shock absorption pad is preferably attached to the leg element. A shock absorption pad is a cushion-shaped shock absorption element that is often arranged on the inside of protective helmets to absorb shocks. However, the shock absorption pad is often attached to the inside of the helmet with adhesive or a Velcro fastener. By attaching the shock absorption pad to the leg element, it stays much more securely in the protective helmet and its height can also be easily adjusted. The leg element also provides additional elasticity towards the helmet shell, which better absorbs lateral impacts. A leg element to which a shock absorption pad is attached is referred to in particular as a padded leg element. In particular, a front shock absorption pad is attached to a front leg element, a left shock absorption pad to a left leg element, and a right shock absorption pad to a right leg element.

[0013] The leg element preferably comprises a holder which is designed to secure a helmet accessory by means of a positive fit and / or latching and / or clamping. The holder fixes the shock absorption pad to the leg element, for example. Other helmet accessories, such as headphones or visors, can also be fixed to the leg element using the holder. Fixing by means of a positive fit, latching and / or a clamp closure is significantly less sensitive to temperature fluctuations than fixing with an adhesive. In addition, many materials suitable for shock absorption, such as expanded polypropylene (EPP) or expanded polystyrene (EPS), are not suitable or only poorly suited to fixing with an adhesive. The holder of the leg element therefore enables particularly secure fixing of shock absorption elements.

[0014] Preferably, the at least one leg element comprises at least two leg elements, wherein the at least two leg elements span a flexible head support element between them, wherein the flexible head support element is arranged between the fastening crown and the lower edge of the helmet shell. Overall, the support frame thus comprises at least two leg elements.

[0015] The flexible head support element is particularly designed to rest against a user's head and / or to nestle against the user's head. The head support element ensures that the user's head does not rest directly against the helmet shell, so that impacts on the helmet shell are not directly transmitted to the user's head. The leg elements stretch the flexible head support element between the top surface of the helmet shell and the bottom edge of the helmet shell. If an impact is exerted on the helmet shell, the helmet shell moves downwards towards the head support element and thus towards the user's head. Since the leg elements form the connection between the fastening crown and the head support element, they are compressed by the impact. The energy of the impact is thus converted into deformation energy, so that the leg elements significantly cushion the impact for the user.The material properties and the shape of the leg elements make it easy to determine the cushioning properties of the protective helmet.

[0016] In particular, the support frame has at least four stiffened leg elements that span the headrest element between them. In particular, the support frame comprises a front right leg element, a front left leg element, a rear right leg element, and a rear left leg element. These four leg elements, in particular, span the headrest element between them and are referred to in particular as clamping leg elements. In particular, the leg elements are not connected to one another except indirectly via the headrest element and the fastening crown.

[0017] Directions such as up, down, left, right, front and back in this description refer to the situation in which the user is wearing the helmet on their head and holding their head straight. In this case, the opening of the helmet is located on the underside of the helmet shell, while the top of the helmet shell is closed. The front of the helmet shell is oriented towards the user's face and forehead, and the back towards the back of the head. In particular, the protective helmet comprises a neck guard which is connected to the helmet shell at the back. In particular, the helmet shell has an essentially hemispherical shape. The lower edge of the helmet shell encloses the opening on the underside of the protective helmet.

[0018] According to one embodiment, the flexible headrest element is a central inner net. The inner net is, for example, a hair net. According to another embodiment, the flexible headrest element is an elastic cloth. In particular, the flexible headrest element is made of a textile or a plastic. In particular, the headrest element has openings. The openings prevent excessive sweating from forming beneath the headrest element. The flexible headrest element is particularly designed to rest against the user's head. In particular, the headrest element is stretchable in the direction of the leg elements that span the headrest element.

[0019] Preferably, the fastening crown of the support frame is arranged at a distance from the headrest element and does not directly touch the headrest element. A gap is thus formed between the fastening crown and the headrest element. This ensures that the helmet shell can move toward the headrest element in response to an impact by bending the leg elements without the helmet shell touching the headrest element.

[0020] Preferably, the leg elements each have a fastening point to which the headrest element is fastened. The fastening point is arranged below the fastening crown, and the fastening point is arranged in particular in a lower half of the leg elements. The fastening points of the leg elements define a position at which the headrest element is fixed to the leg elements. For example, the fastening point comprises a slot or another element for securing the headrest element.

[0021] According to one embodiment, at least one of the leg elements has multiple attachment points arranged one behind the other along a longitudinal direction of the leg element. By providing multiple attachment points on a leg element, the height of the head support element's fixation can be adjusted. In this way, the helmet can be adapted to different head shapes, for example, and / or the cushioning properties can be modified.

[0022] Preferably, the head support element is secured exclusively to the leg element attachment points. In other words, apart from the leg elements, there are no other attachment elements securing the head support element to the helmet shell. This advantageously ensures that the impact forces are not transmitted directly to the head support element via an additional attachment element, thus reducing cushioning.

[0023] Preferably, the leg element has a flat shape, wherein a length of the leg element is greater than a width of the leg element and the width is greater than a thickness of the leg element, wherein in particular the width is at least ten times the thickness of the leg element. This shape provides a good attachment option for helmet accessories and achieves a good damping effect. In particular, the thickness of the leg element is 0.2 mm to 1.0 mm.

[0024] Preferably, the leg element is rigid across its width and exhibits greater flexibility across its thickness than across its width. The shape and structural properties of the leg element ensure that, upon impact, the leg element bends along its thickness, but not along its width or length. This determines the direction of deformation and thus the strength of the damping.

[0025] In particular, the leg element is arranged such that an outer surface of the leg element is aligned with the inside of the helmet shell, with the outer surface extending in the length and width of the leg element. The outer surface of the leg element runs, in particular, parallel to the inside of the helmet shell. This alignment, together with the shape of the leg element, results in a central section of the leg element bending outward toward the helmet shell upon impact. A lower section of the leg element, in contrast, is bent toward the inside of the helmet.

[0026] Preferably, the leg element is curved, with the curvature of the leg element particularly following the curvature of the helmet shell. In other words, the leg element is pre-bent. The curvature of the leg element determines the direction of bending in response to an impact, so that the forces are specifically directed into the leg element.

[0027] In particular, the fastening crown is fixed to an upper region of the helmet shell. Preferably, the fastening crown is fixed, in particular exclusively, to an upper third of the hemisphere, in particular a quarter of the hemisphere, of the helmet shell. The thirds of the hemisphere or quarters of the hemisphere are defined such that they extend from the lower edge of the helmet shell to the upper side of the helmet shell. Neck protection is not taken into account here. The helmet shell is divided into three or four parts of equal height along a height of the helmet shell. The fastening crown is fixed, in particular exclusively, in this upper third of the hemisphere or quarter of the hemisphere. Starting from this positioning of the fastening crown, the leg element or the leg elements extend downwards towards the lower edge of the helmet shell. In this way, it is achieved that the leg element orThe leg elements can effectively absorb the energy of impacts, thus protecting the user's head. The fastening crown is secured to the upper third or quarter of the hemisphere, primarily by means of the textile layer.

[0028] In particular, the fastening crown has an outer edge and a central recess, with the leg element protruding outwards from the outer edge. This shape of the fastening crown allows easy fixation to the helmet shell. Furthermore, the leg element can be arranged along the inside of the helmet shell as required for the respective protective helmet. In particular, the outer edge and / or the fastening crown is designed such that the outer edge and / or the fastening crown follows a line of the same height in the helmet shell. In other words, the fastening crown is arranged horizontally in the helmet shell. The fastening crown has, in particular, a flat shape whose edge is formed by the outer edge. In particular, the fastening crown has a polygonal shape, for example an octagonal shape.

[0029] Preferably, the leg element, and in particular the fastening crown, is made of or comprises a molded plastic. A molded plastic is advantageous because it provides the leg elements with the necessary stability and rigidity to absorb shocks caused by deformation.

[0030] According to one embodiment, the molded plastic is a polypropylene fabric molded into a flat matrix. In particular, the leg element consists of the polypropylene fabric. A molded polypropylene fabric advantageously has the stiffness and stability required for the leg element. During production, the polypropylene fabric is molded, in particular, into a sheet. The leg element(s) are then cut from this sheet. For example, the molded polypropylene fabric is the material known under the brand name "Curv" from the company Propex.

[0031] According to a further embodiment, a helmet accessory is attached to at least one of the leg elements. The helmet accessory can be, for example, a belt system, a sensor, a microphone, headphones, a visor, or a similar helmet accessory.

[0032] According to one embodiment, the leg element is fixed to the mounting crown in a height-adjustable manner. The height adjustability of the leg element allows the position of the head support element and / or the shock absorption pads and / or other helmet accessories to be changed. For example, the leg element has different locking sections with which it can be fixed to the mounting crown. Depending on the locking section used, the leg element extends downwards towards the lower edge of the helmet shell by different distances.

[0033] Overall, the support frame significantly improves the fit of the helmet. Lateral tilting of the helmet on the user's head is reduced. The improved fit of the helmet on the head significantly reduces rolling and yawing movements of the helmet, thus increasing wearing comfort.

[0034] Further features of the invention will become apparent from the description of embodiments of the invention together with the claims and the accompanying drawings. Embodiments of the invention may incorporate individual features or a combination of several features.

[0035] Within the scope of the invention, features marked with "in particular" or "preferably" are to be understood as optional features.

[0036] The invention is described below, without limiting the general inventive concept, using exemplary embodiments with reference to the drawings, whereby express reference is made to the drawings for all details of the invention not explained in more detail in the text. They show: Fig. 1a schematically simplified side view of a protective helmet with neck protection, Fig. 2a schematically simplified cross-sectional view through the helmet from Fig. 1 , Fig. 3 a schematically simplified perspective view of a support frame for a protective helmet, Fig. 4 a schematically simplified view of a protective helmet with support frame from below, Fig. 5 a schematically simplified view of the protective helmet from Fig. 4 with padding elements, Fig. 6 a schematic simplified representation of the protective helmet from Fig. 5with an elastic head support element which is spanned by the support frame, Fig. 7 a schematically simplified representation of a further embodiment of a support frame from below, which is sewn to a textile layer and Fig. 8 a schematically simplified representation of the support frame from Fig. 7 from above.

[0037] In the drawings, identical or similar elements and / or parts are provided with the same reference numbers, so that a repeated presentation is omitted.

[0038] Fig. 1 shows a simplified schematic side view of a protective helmet 2 with a helmet shell 4 and a neck guard 8. An upper helmet section 7 of the helmet shell 4 is also referred to as the helmet crown. A lower edge 6 of the helmet shell encloses an opening in the helmet shell 4 on its underside. Fig. 1the helmet shell 4, without the neck protection 8, is divided into an upper hemisphere third 50, a middle hemisphere third 52 and a lower hemisphere third 54, each of which has the same height.

[0039] Fig. 2 shows a cross-sectional view through the helmet from Fig. 1It can be seen that a fastening crown 12 of a support frame 10 is fixed to the inner side 5 of the helmet shell 4 in the upper hemisphere third 50. In the illustrated embodiment, the fixation is achieved via a textile layer 9, to which the fastening crown 12 is sewn, for example. The textile layer 9 is in turn pressed into the inner side 5 of the helmet shell 4. The support frame 10 also has a plurality of leg elements 20 which extend from the fastening crown 12 downwards towards the lower edge 6 of the helmet shell. However, the fastening crown can also be fixed directly to the inner side 5 of the helmet shell 4, for example, glued in. It is also possible to form the fastening crown as a component of the helmet shell 4.

[0040] The support frame 10 is in Fig. 3 shown in a perspective view. InThis view clearly shows that the fastening crown 12 has an annular shape with an outer edge 14 and a central recess 16, which is enclosed by the outer edge 14. The outer edge 14 has an octagonal shape with eight sides. From seven of these eight sides, one of the leg elements 20 protrudes outwards. The leg elements 20 each have a curvature 22, which essentially follows the curvature of the helmet shell 4. There are two different types of leg elements 20 in the embodiment in Fig. 3Three of the leg elements 20 on the front, the left side, and the right side are widened and designed as cushioning leg elements, which are designed to accommodate shock absorption pads. The remaining four leg elements 20, however, each have several fastening points 24 in the form of slots on their lower section. These slots are intended to accommodate a flexible head support element, for example a hair net, between them. These four leg elements 20 are clamping leg elements. However, the number of cushioning leg elements and clamping leg elements can vary depending on the number of leg elements 20 in Fig. 3For example, the headrest element can be supported by only two leg elements 20, and more or fewer than three padding leg elements can be provided. Furthermore, leg elements 20 can be provided to accommodate additional helmet accessories, for example, a belt system, sensors, a microphone, or headphones.

[0041] Fig. 4 shows a protective helmet 2 with the support frame 10 in a bottom view. The support frame 10 is fixed to the helmet shell 4 only by the fastening crown 12, while the leg elements 20 are free-standing. For this purpose, the outer edge 14 is sewn and pressed into the helmet shell 4 in the area of ​​the upper helmet section 7, for example, using the textile layer 9, or is already incorporated into the helmet shell during the manufacture of the helmet shell 4. According to another embodiment, the outer edge 14 can also be glued to the textile layer 9.

[0042] As in Fig. 5As shown, a shock absorption pad 30 is fixed to each of the front, left, and right leg elements 20. In this way, the shock absorption pads 30 can be arranged in the protective helmet 2 without providing fastening means, for example in the form of a hook-and-loop fastener, directly on the helmet shell 4. Instead, the shock absorption pads 30 are fixed to the leg elements 20 via a holder 30, which operates by means of a latching mechanism, a clamping device, and / or a positive fit. Such a fixation is also significantly more temperature-resistant than fixation by means of an adhesive and less wear-resistant than fixation by means of a hook-and-loop fastener. The leg elements 20 also impart increased flexibility to the shock absorption pads 30, whereby the fit of the protective helmet 2 can be adapted to different head shapes and the damping of the protective helmet 2 is increased.The leg elements 20 for receiving the upholstery elements 30 can be designed to be height-adjustable. For example, the leg elements 20 include different slots with which the leg elements 20 can be fixed to the mounting crown 12.

[0043] In Fig. 6 A flexible head support element 40 in the form of a net is stretched between the remaining four leg elements 20. The head support element 40 can be, for example, a textile net or a plastic net, designed, for example, as a hair net. In any case, the head support element 40 is designed to rest against the user's head when the user is wearing the protective helmet 2.

[0044] If an impact is exerted on the helmet shell 4, the upper helmet section 7 of the helmet shell 4 moves towards the head support element 40, which rests against the user's head. The energy of the impact causes a deformation of the leg elements 20, which are deformed as predetermined by the curvature 22 in order to absorb the impact energy. In this way, the impacts against the user's head are dampened. In contrast to protective helmets 2, in which, for example, a hairnet is fixed directly to the helmet shell 4 in the area of ​​the lower edge 6 of the helmet shell, the protective helmet made of Fig. 6 the energy of the impact is transmitted indirectly via the leg elements 20. While a fixation in the area of ​​the lower edge 6 of the helmet shell merely results in an extension of the head support element 40 in response to an impact, in the protective helmet 2 made of Fig. 6 The impact forces are additionally absorbed by the bending of the leg elements 20.

[0045] The functionality of the leg elements 20 for absorbing the energy of the impact is improved by the fact that the support frame 10 is fixed to the helmet shell 4 by means of the fastening crown 12 above the head support element 40. This allows the upper helmet section 7 and the head support element 40 to move toward each other in response to the impact and to absorb the energy through the leg elements 20.

[0046] Fig. 7 shows another embodiment of a support frame 10 in a view from below. In Fig. 8 The same support frame 10 is shown in a top view. The top side of the fastening crown 12 of the support frame 10 is sewn to a textile layer 9, which is Fig. 7is indicated schematically. The support frame 10 comprises a total of eight leg elements 20, four of which are designed to receive a headrest element 40. Shock absorption pads 30 are fixed to three of the leg elements 20 by means of a holder 32. The holder 32 comprises two openings through which some of the shock absorption pads 30 are pushed in order to clamp them to the leg elements 20. These openings are clearly visible on the leg element 20 which is shown in Figs. 7 and 8is arranged at the bottom and does not yet include a shock-absorbing pad 30. Another leg element 20 is particularly long and designed to accommodate helmet accessories, such as a visor. The leg elements are each fixed to the fastening crown 20 by means of a locking bracket 26. The locking bracket 26 makes it possible to change the holding length of the leg elements 20. For example, the leg element 20 at the bottom right has a reduced holding length compared to the other leg elements 20 due to a modified fixation and thus protrudes less far towards the lower edge 6 of the helmet shell.

[0047] All mentioned features, including those revealed solely in the drawings as well as individual features disclosed in combination with other features, are considered essential to the invention, both individually and in combination. Embodiments according to the invention may be fulfilled by individual features or a combination of several features. List of reference symbols

[0048] 2 Protective helmet 4 Helmet shell 5 Inside 6 Lower edge of helmet shell 7 Upper helmet section 8 Neck protection 9 Textile layer 10 Support frame 12 Attachment crown 14 Outer edge 16 Recess 20 Leg element 22 Curve 24 Attachment point 26 Snap-in bracket 30 Shock absorption pad 32 Bracket 40 Head support element 50 Upper hemisphere 52 Middle hemisphere 54 Lower hemisphere

Claims

1. A protective helmet (2) comprising a helmet shell (4) and a support frame (10), wherein the support frame (10) comprises an annular fastening crown (12), wherein the fastening crown (12) is fixed to an inner side (5) of the helmet shell (4) or is formed as a component of the inner side (5) of the helmet shell (4), wherein the support frame (10) comprises at least one stiffened leg element (20), wherein the leg element (20) extends in a free-standing manner from the fastening crown (12) in the direction of a lower edge (6) of the helmet shell of the protective helmet (2).

2. Protective helmet (2) according to claim 1, characterized in that the fastening crown (12) is fixed directly to a textile layer (9), wherein the textile layer (9) is fixed to the inside (5) of the helmet shell (4).

3. Protective helmet according to claim 2, characterized in that the fastening crown (12) is sewn to the textile layer (9).

4. Protective helmet according to claim 2 or 3, characterized in thatthe textile layer (9) is pressed into the inside of the helmet shell (4).

5. Protective helmet (2) according to one of claims 1 to 4, characterized in that a shock absorption pad (30) is fixed to the leg element (20).

6. Protective helmet (2) according to one of claims 1 to 5, characterized in that the leg element (20) comprises a holder (32) which is designed to fix a helmet accessory by means of positive locking and / or locking and / or clamping.

7. Protective helmet according to one of claims 1 to 6, characterized in that the at least one leg element (20) comprises at least two leg elements (20), wherein the at least two leg elements (20) span a flexible head support element (40) between them, wherein the flexible head support element (40) is arranged between the fastening crown (12) and the lower edge (6) of the helmet shell, wherein the flexible head support element (40) is in particular a central inner net.

8. Protective helmet (2) according to claim 7, characterized in thatthe fastening crown (12) is arranged at a distance from the head contact element (40) and does not directly touch the head contact element (40).

9. Protective helmet (2) according to claim 7 or 8, characterized in that the leg elements (20) each have a fastening point (24) to which the head support element (40) is fastened to the leg elements (20), wherein the fastening point (24) is arranged below the fastening crown (12), wherein the fastening point (24) is arranged in particular in a lower half of the leg elements (20), wherein in particular at least one of the leg elements (20) has a plurality of fastening points (24) which are arranged one behind the other along a longitudinal direction of the leg element (20).

10. Protective helmet (2) according to claim 9, characterized in that the head support element (40) is fixed exclusively to the fastening points (24) of the leg elements (20).

11. Protective helmet (2) according to one of claims 1 to 10, characterized in thatthe leg element (20) has a flat shape, wherein a length of the leg element (20) is greater than a width of the leg element (20) and the width is greater than a thickness of the leg element (20), wherein in particular the width is at least ten times as large as the thickness of the leg element (20).

12. Protective helmet (2) according to claim 11, characterized in that the leg element (20) is rigid in the width direction and has greater flexibility in the thickness direction than in the width direction.

13. Protective helmet (2) according to one of claims 1 to 12, characterized in that the leg element (20) is curved, wherein a curvature (22) of the leg element (20) in particular follows a curvature of the helmet shell (4).

14. Protective helmet (2) according to one of claims 1 to 13, characterized in that the fastening crown (12) is fixed, in particular exclusively, to an upper hemisphere third (50), in particular hemisphere quarter, of the helmet shell (4).

15. Protective helmet (2) according to one of claims 1 to 14, characterized in that the leg element (20), and in particular the fastening crown (12), is made of a pressed plastic or comprises a pressed plastic, wherein the pressed plastic is in particular a polypropylene fabric which is pressed into a flat matrix.

Images