JPS6037849Y2 - Trunk and floor mats for automobiles and other transportation vehicles - Google Patents

Description

[Detailed Description of the Invention] The present invention is intended to replace the rubber mats that have been mainly used as trunk and floor linings in standard automobiles until now, which have some obvious drawbacks, and which can be used in automobiles, railway vehicles, airplanes, etc.
Concerning trunks and floor mats for transportation vehicles such as ships.

Disadvantages of this rubber mat include, among other things, its heavy weight, often unpleasant odor and unsatisfactory appearance.

Moreover, it is extremely difficult to process the COMMAT and to precisely match it to its base plate.

Moreover, matching the color of the rubber mat to, for example, the color of the vehicle is difficult and only possible at great expense.

laying or lining the trunk and interior floors of motor vehicles with other materials in the form of molded or unmolded single or multi-layered mats;
It is already known to protect the floorboards, compensate for the irregularities of the boards, and provide heat and sound insulation.

The type and nature of the materials used vary greatly depending on the requirements that must be met for each class and type of vehicle and the comfort of the individual vehicle, ranging from felt to felt from sponge board as an underlay for the tongue. , or untreated PVC products or the tongue itself.

It has now been found that particularly advantageous linings for the trunks and floors of motor vehicles and other vehicles can be obtained by using mats made from closed-cell polyethylene sponge, optionally laminated.

An advantageous implementation of the trunk and floor mat consists in producing it from a closed-cell polyethylene sponge laminated on one or both sides with a polyolefin sheet, in particular an unoriented polyethylene sheet.

The mat has a specific gravity of 30 to 200 kg/m, especially 100 to 20
It is advantageous to use polyethylene sponges produced from 0 kg/i polyethylene sponges, in particular crosslinked polyethylene sponges.

In most cases, the surface is a polyethylene sponge with a specific gravity of 100 to 200 kg/rr, and the bottom surface is a specific gravity of 30 to 50 kg/rr.
The use of a polyethylene sponge composite made of the polyethylene sponge of e.g. also provides the following advantages.

The surface layer with high specific gravity has great abrasion resistance, impermeability to dirt and high resistance to indentation, and the light sponge layer on the underside forms an inexpensive elastic cushion.

The mat is formed by processing a polyethylene sponge in an elastic or plastic state in a vacuum, under overpressure, or by pressing according to known methods.

A pattern can also be engraved on one or both sides during this pressurization.

Engraved pattern increases safety against slipping. The polyethylene sponge material may in particular be colored up to 6 parts.

The great advantage of the trunk and floor mats according to the invention is that they are much lighter in weight than rubber mats and do not have unpleasant harmful odors.

Due to its structure, this mat can be molded very easily and its shape can be precisely adapted by molding to a given trunk or floor of a motor vehicle.

The appearance of the mat is advantageously improved in that the pattern can be pressed on one or both sides, while condensate formation is avoided by ventilation on the back side of the mat.

Generally, the water absorption of this mat is very low due to its closed cell structure, and its aging and weathering stability is very high.

Furthermore, this mat is stable to solvents, especially benzine.

- Figures 1 and 2 show an embodiment of a trunk mat with an engraved pattern on both sides, which is entirely molded;
The figure shows the front side, and Figure 2 shows the back side.

Fig. 3 shows the material structure before mat forming in an enlarged cross section, where each layer consists of an upper layer with a specific gravity of 100 to 200 kg/rrr and a lower layer with a specific gravity of 30 to 50 kp/-. A closed cell polyethylene sponge band A is a thin polyethylene sheet B.
The frame is covered with.

FIG. 4 shows a portion of a trunk mat engraved with a square grid pattern.

An example of manufacturing the upper layer of the mat according to the present invention will be described below.

Example 1 (manufacturing example of the upper layer of the trunk mat) Manufactured from high-pressure polyethylene containing 1% by weight of dicumyl peroxide as a crosslinking agent and 4.5% by weight of azodicarbonamide as a blowing agent, specific gravity 100 kg/i, thickness 5
A partially cross-linked closed-cell polyethylene sponge strip of rIrIn is formed into a trunk mat using a male die preheated to 30-50°C by a double-sided vacuum forming process to 130-160°C on both sides in a radiant heating device.

During the forming process, the ram imprints a pattern onto the still thermoelastic surface.

Example 2 (Example of production of trunk mat upper layer with polyethylene sheet) The partially crosslinked closed cell polyethylene sponge strip according to example 1 was frame-covered with an unstretched polyethylene sheet with a thickness of 150 µm and was subsequently heated in an air circulation oven to the temperature of the material. is 120~
Heat to 150°C and place in a closed female mold.
It is formed into a trunk mat by pressure molding at an air pressure of ~2 atmospheres (gauge pressure).

The upper mold of this two-part mold is provided with a ram that imprints the desired pattern, in this case a square grid pattern, onto the surface during molding.

Example 3 (Example of production of floor mat upper layer) 1% by weight of dicumyl peroxide as a crosslinking agent and 2. azodicarbonamide as a blowing agent. Specific gravity 200 kg/d, thickness 6R manufactured from high-pressure polyethylene containing %
The partially crosslinked closed cell polyethylene sponge strip of rrm is heated to 130-150°C on both sides in a radiant heating device and then formed into a floor mat by vacuum forming in a male mold preheated to 30-50°C.

This floor mat has a pattern on one side only.

[Brief explanation of the drawing]

Figure 1 is a view showing the surface appearance of the trunk mat according to the present invention, Figure 2 is a view showing the back view of the trunk mat, Figure 3 is a view showing the structure of the material before molding, and Figure 4 is a plan view of a part of the molded material. FIG. A...Polyethylene sponge, B...
polyethylene sheet.

Claims (1)

[Scope of utility model registration request] In automobile and other transportation trunk and floor mats made of closed-cell polyethylene sponge, optionally laminated, a composite consisting of two layers of chemically cross-linked polyethylene sponge is bonded to the trunk or floor of a motor vehicle by the application of pressure and heat. The upper layer of the molded mat has a specific gravity of 100 to 200.
kg/rre polyethylene sponge layer, the lower layer of the molded mat is formed of a polyethylene sponge layer with a specific gravity of 30 to 50 ko/m, and one or both sides of the mat have an engraved pattern. Trunk and floor mats.