JPH047961Y2 - - Google Patents

Description

[Detailed explanation of the invention] ``Purpose of the invention'' This invention relates to the invention of a car hood, which prevents the humidity inside the car from increasing even when the hood is attached, prevents windows from fogging up, and can be used in the summer. The present invention aims to provide a car top that provides a comfortable atmosphere inside the car, is relatively lightweight, and takes up less space when stored.

Industrial Application Fields Canopies used for vehicles such as open cars, jeeps, and trucks.

BACKGROUND ART It is well known that a hood is used for open cars, etc., and the hood is removed during sunny weather, and the hood is attached during rainy or cold seasons. However, the canopies conventionally used are made of rubber or waterproof canvas cloth coated with resin.

Problems that the invention aims to solve When the conventional car tops are installed, the humidity inside the car increases, making the inside of the car hot and humid, especially in the summer, making the car uncomfortable and causing the windows to fog up. If you do not clean it from time to time, it will interfere with driving. In addition, conventional hoods such as those mentioned above are quite heavy and are made of thick material, making them waterproof and suitable for use as a substitute for the vehicle body wall.
Many of them require light resistance and durability, so they are quite heavy, and if they are to be removed and driven in an open state, a large amount of storage space will be required.

"Structure of the invention" Means for solving the problem A polyester canvas cloth or other woven fabric is laminated on a porous polytetrafluoroethylene film or a membrane material in which the porous polytetrafluoroethylene film is coated with a hydrophilic resin. A car hood characterized by being formed from fabric.

Function The porous polytetrafluoroethylene film has moisture permeability due to its fine pores, and has sufficient waterproofness due to the fineness of the pores and water repellency. In other words, it releases the moisture inside the car and prevents rainwater from entering.

By laminating polyester canvas cloth or other knitted or woven fabric, it is appropriately reinforced and exhibits sufficient durability.

Coating the porous polytetrafluoroethylene film with a hydrophilic resin prevents gas or liquid from permeating, but under conditions where the water vapor concentration is high on one side of the membrane material and low on the other side, it is possible to prevent gas or liquid from permeating from the side with high water vapor concentration. It absorbs moisture and allows the moisture to move so that it is released or evaporated on the lower side, thereby reducing the moisture inside the vehicle in the same manner as described above.

Embodiment A concrete embodiment of the present invention as described above will be described with reference to the attached drawings.The above-mentioned car hood 8 is attached to the front, rear, and intermediate portions of the vehicle body 10 as shown in FIG. It is spread out on support members 15, 15, which are appropriately arranged, and is fixed to the vehicle body 10 with a stopper 16. However, such a car top is made of a porous polytetrafluorethylene film 1 as shown in FIGS. 2 and 3, or a membrane material such as that shown in FIGS. 5 and 6 in which the film 1 is coated with a hydrophilic resin. 5a, the film 1 or 1a is laminated with a base fabric 6 such as a piece of polyester cloth or a piece of canvas cloth as shown in FIG. 4 or 7. The above-mentioned film 1 can be easily manufactured by rolling or stretching a polytetrafluoroethylene film piece, or both, and its specific structure is as shown in FIGS. 2 and 3. A large number of fine fibers 12 are formed in a spider web shape between countless fine nodules 11, and pores 13 are formed between these fine fibers.
Its porosity is at least 75% and generally 80
It has been obtained as ~95%.

In other words, this material does not allow water to pass through due to its microporosity and hydrophobicity, and the pores 13 allow sufficient gas to pass through, thereby preventing water from leaking into the car during rainy weather. Moreover, it is possible to appropriately eliminate the feeling of stuffiness caused by the increase in moisture inside the vehicle.

In addition, since the items shown in Figures 2 and 3 allow gas to pass through, the warm atmosphere inside the car will be dissipated during cold seasons.If this is undesirable, please refer to Figures 5 and 6 separately. An air-impermeable and hydrophilic coating layer 2 was formed on one side of the polytetrafluoroethylene membrane material 5 having the structure as shown in FIG. 2 or 3 above. Although the coating layer 2 does not allow gas or liquid to pass through the pore structure formed by the pores 13, under conditions where the water vapor concentration is high on one side of the membrane material 5a and low on the other side, water vapor does not pass through the coating layer 2. It is a hydrophilic material that absorbs moisture from the high concentration side and allows moisture to move so as to be desorbed or evaporated from the low concentration side, and can be obtained from polyether polyurethane, perfluorosulfonic acid, etc. For example, the product name by WRGrace, USA
Hypol, Nafipn manufactured by EI du Pont, etc. are examples of products that can form such a covering layer 2 accurately.

In other words, according to the present invention as described above, the material is waterproof and moisture permeable, and effectively prevents rainwater etc. from entering the interior of the vehicle during rainy weather, and moreover, even if the humidity inside the vehicle increases. It is moisture permeable to the outside of the vehicle, does not cause discomfort even in summer, and therefore prevents dew condensation on window surfaces. Since the devices shown in FIGS. 5 to 7 have no air permeability, the atmosphere inside the vehicle does not leak under conditions where the interior of the vehicle is not heated or cooled, and the moisture is effectively discharged. When such a product of the present invention is used for a truck top, for example, it is possible to effectively prevent vegetables from rotting or deteriorating due to high humidity.

``Effect of the invention'' The invention as explained above uses a membrane material that is both waterproof and moisture permeable, so it can appropriately prevent rainwater from entering the interior of the car during rainfall. Moreover, it effectively eliminates high humidity inside the car and allows for comfortable use, and since it is laminated with a base fabric 6 such as polyester cloth pieces, it has sufficient strength.
Moreover, since it is made of a relatively thin layer and lightweight, it has the advantage of being convenient for storage when not in use, and is a highly effective idea in practical terms.

[Brief explanation of the drawing]

The drawings show embodiments of the invention,
Figure 1 is a perspective view showing an example of the product installed on a car body, Figure 2 is a microscopic photo of one example of the fiber shape of the porous polytetrafluoroethylene, and Figure 3 is another example. FIG. 4 is a cross-sectional view of the fabric shown in FIGS. 2 and 3, and FIG. 5 is a microscopic photo of the fiber shape of another porous polytetrafluoroethylene according to the present invention. Figure 6 is a micrograph of the fiber-shaped portion seen from the hydrophilic coating layer side.
FIG. 7 is a sectional view of the fabric shown in FIGS. 5 and 6. In these drawings, 1 and 1a are porous polytetrafluoroethylene films, 2 is a hydrophilic coating layer, 5 and 5a are membrane materials, 6 is a base fabric, 10 is a vehicle body, 11 is a micro nodule, and 12 is a Fine fiber, 13
indicates pores.

Claims (1)

[Scope of utility model registration request] A car use fabric characterized by being made of a fabric obtained by laminating a polyester canvas cloth or other knitted or woven fabric onto a porous polytetrafluoroethylene film or a membrane material obtained by coating the porous polytetrafluoroethylene film with a hydrophilic resin. hood.