JP6769843B2 - Door hole seal and synthetic resin sheet for door hole seal - Google Patents

Description

The present invention relates to a door hole seal and a synthetic resin sheet for a door hole seal, which are attached to the inside of a door inner panel via a synthetic resin sheet with butyl rubber.

As shown in FIGS. 10 and 11, conventionally, the door 100 of an automobile covers the opening H formed in the door inner panel 102 that constitutes the door outer panel 101, and the soundproofing measures and waterproofness inside the door 100 are taken. Some door hole seals 10 are provided between the door inner panel 102 and the door trim 103 for securing. The door hole seal 10 is attached to the inside of the vehicle inside the door inner panel 102.

The door hole seal 10 is a rubber sheet main body 11 in which a PE (polyethylene) sheet 12 with an unvulcanized viscous butyl rubber 13 is integrated by heat welding. The welded portion is indicated by reference numeral T.
The rubber sheet main body 11 is made of a highly foamed sponge rubber sheet, and there are not only a single-layer structure but also a multi-layer structure such as two layers and three layers, and a corrugated one in which a plurality of uneven portions are formed. ..

When storing or transporting a plurality of such door hole seals 10 on top of each other, the butyl rubber 13 provided on the upper surface of the lower door hole seal 10 suddenly appears on the lower surface of the upper door hole seal 10. May adhere.
In order to prevent this, as shown in FIG. 12, a paper pattern 15 is sandwiched between the butyl rubber 13 on the door hole seal 10 side located on the lower side and the PE sheet 12 on the door hole seal 10 side located on the upper side. There is a need.
For example, in order to stack three door hole stickers 10 on the top and bottom, it is necessary to have three sheets of paper 15 between the door hole stickers 10 adjacent to the top and bottom and the top, that is, the same number of three sheets of paper as the door hole stickers 10.

However, since the paper pattern 15 has a larger area than the door hole seal 10, there is a problem that the cost is significantly increased. Further, after the door hole seal 10 is attached to the door 100, it is necessary to dispose of the paper pattern 15, which causes a problem that it takes time and effort.

On the other hand, it is also known that a release layer using a silicone-based resin is provided instead of providing a release paper (for example, Patent Documents 1 and 2), but these are used for door hole seals. It was not done. Further, the prevention of sticking of butyl rubber and the welding of the rubber sheet main body 11 are not particularly taken into consideration.

Japanese Unexamined Patent Publication No. 2002-219778 Jikkai Sho 54-133166

Therefore, an object of the present invention is to provide a door hole seal and a synthetic resin sheet for a door hole seal, which are cost-effective and easy to handle during storage and transportation.

In order to achieve the above object, in the door hole seal of the present invention, a rubber sheet main body (21) is attached to the inside of the car inside the door inner panel (102) via a synthetic resin sheet (22), and the door inner is said. While covering the opening (H) formed in the panel (102), the synthetic resin sheet (22) is fixed to the rubber sheet main body (21), and the outer peripheral end side of the synthetic resin sheet (22) is fixed. A door hole seal (20) fixed to the inside of the door inner panel (102) by an adhesive member (23) provided on the outside of the vehicle.
A releasable film (30) is formed on the inner side surface of the synthetic resin sheet (22) so as to form a plurality of gaps (M), and the synthetic resin sheet (22) is formed on the rubber sheet main body (21). It is characterized by being welded to.

Further, the present invention is characterized in that the planar shapes of the plurality of gaps (M) are the same shape and the same size, and the releasable film (30) is formed in a uniform pattern.

Further, in the present invention, the release film (30) is formed in a uniform pattern by providing a plurality of planar shapes of the release film (30) with the same shape in a circle or a square and having the same size. It is characterized by.

Further, the present invention is characterized in that the planar shape of the release film (30) is made square so that adjacent release films are in contact with each other at corners.

Further, the present invention is characterized in that the planar shape of the release film (30) is made circular so that adjacent release films are in contact with each other.

Further, the present invention is characterized in that the minimum distance between the plurality of gaps (M) is set to 1 mm or less.

Further, the present invention is characterized in that the ratio of the total area of the plurality of gaps (M) to the total area of the surfaces of the releasable film (30) is 40:60 to 95: 5.

Further, the synthetic resin sheet for a door hole seal of the present invention is a synthetic resin sheet (22) used for a door hole seal (20) fixed to an automobile door inner panel (102), and a plurality of synthetic resin sheets (22) are used on one surface. It is characterized in that a releasable film (30) is formed so as to form a gap (M) between the two.

The symbols in parentheses indicate the corresponding elements or corresponding items described in the drawings and the mode for carrying out the invention described later.

According to the present invention, the door hole seal is fixed to the inside of the vehicle by an adhesive member provided on the outside of the synthetic resin sheet to which the rubber sheet main body is attached, and is the inner surface of the synthetic resin sheet. Is formed with a releasable film so as to generate a plurality of gaps (untreated portion not treated with the releasable film), and the synthetic resin sheet is welded to the rubber sheet main body through the gaps. The synthetic resin sheet is strongly fixed to the rubber sheet body.

When a plurality of such door hole seals are stacked one above the other with the rubber sheet body side down and the adhesive member side up, the synthetic resin of the upper door hole seal is on the outer peripheral end side of the synthetic resin sheet. Since a release film is provided between the sheet and the adhesive member of the lower door hole seal, even if the upper surface of the adhesive member comes into contact with the lower surface of the upper door hole seal, it can be easily peeled off. it can.
Therefore, it is convenient because a plurality of door hole seals can be safely stacked and stored or transported without being bulky.
At this time, since the paper pattern is not used as shown in the conventional example, the cost is not particularly high, and it does not take time to dispose of the paper pattern.
Here, the releasable film may be a film made of a material having excellent peelability to the adhesive member described later, such as silicone resin or flexographic resin, and the film may be formed by spray coating or a gravure coater. It is molded by a commonly known coating or printing technique such as a flexo coater. The adhesive member may be any material generally called an adhesive or an adhesive, such as an unvulcanized rubber-based material such as butyl or urethane. Neither the releasable film nor the adhesive member is specified in the cases described herein.

Further, according to the present invention, the planar shapes of a plurality of gaps (untreated portions not treated with a releasable film) are separated by the same shape and the same size, for example, a circular dot shape or a square checkered pattern. By forming the mold film in a uniform pattern, the function of the synthetic resin sheet that is weldable to the rubber sheet body is maintained, and the function of the releasability of the adhesive member when multiple sheets are stacked is effective. Can be demonstrated.

In particular, it is effective to set the minimum distance between the plurality of gaps within 1 mm and the ratio of the total area of the plurality of gaps to the total area of the surface of the release film to be 40:60 to 95: 5.

FIG. 5 is an enlarged cross-sectional view taken along line AA of FIG. 10 showing a state in which the door hole seal according to the embodiment of the present invention is attached. It is an enlarged sectional view which shows the main part of the door hole seal shown in FIG. FIG. 5 is an enlarged cross-sectional view showing a state in which a plurality of (three) door hole seals shown in FIG. 1 are stacked. It is a top view which shows the pattern of the silicone film formed on the synthetic resin sheet of the door hole seal which concerns on embodiment of this invention, (a) is a checkered pattern of 0.5 mm on a side, (b) is 1. Shows a 0 mm checkered pattern. It is a top view which shows the pattern of the silicone film formed on the synthetic resin sheet of the door hole seal which concerns on embodiment of this invention, (a) is the dot shape of 0.5mm diameter, (b) is the diameter 1. It shows a dot shape of 0 mm. It is a top view which shows the pattern of the silicone film formed on the synthetic resin sheet of the door hole seal which concerns on embodiment of this invention, (a) is the strip of 0.5mm width, and the interval is 0.5mm, (b). ) Indicates a strip having a width of 0.5 mm and an interval of 1.0 mm. It is a top view which shows the pattern of the silicone film formed on the synthetic resin sheet of the door hole seal which concerns on embodiment of this invention, and (a) is the strip of 0.5mm width as the interval of 0.5mm in length and width. (B) shows a strip-shaped one having a width of 0.5 mm and an interval of 1.0 mm in length and width. It is a top view which shows the pattern of the silicone film formed on the synthetic resin sheet of the door hole seal which concerns on embodiment of this invention, and shows circles having a diameter of 1.0 mm in contact with each other. FIG. 5 is an enlarged cross-sectional view showing a state in which a plurality of (three) sheets having a silicone film formed on the entire inner surface of the synthetic resin sheet of the door hole seal shown in FIG. It is an external side view of an automobile. FIG. 5 is an enlarged cross-sectional view taken along the line AA of FIG. 10 showing a state in which the door hole seal according to the conventional example is attached. It is sectional drawing which shows the state in which a plurality of (three) door hole seals shown in FIG. 11 are stacked.

The door hole seal 20 according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the door hole seal 20 is provided between the door inner panel 102 and the door trim 103, and covers the opening H formed in the door inner panel 102.

The door hole seal 20 comprises a rubber sheet main body 21 having excellent sound insulation and sound absorption, a synthetic resin sheet 22 integrated with the sheet main body 21, and a butyl rubber 23 provided on the vehicle outer surface of the synthetic resin sheet 22. A silicone film 30 is formed on the inner side surface of the synthetic resin sheet 22.

The rubber sheet main body 21 is made of a highly foamed rubber-like elastic body, and examples thereof include materials mainly composed of synthetic rubber such as EPDM, CR, SBR, and NBR, and elastomers.
In this embodiment, an EPDM sponge rubber sheet having a specific gravity of 0.3 or less is used as the rubber sheet main body 21.
Further, the rubber sheet main body 21 is formed with holes and notches for allowing various cables to pass through and for the operator to insert his / her hand during work.

The synthetic resin sheet 22 is donut-shaped (annular), and the inside of the vehicle on the inner peripheral end 22a side is fixed to the outer periphery of the outer peripheral edge of the rubber sheet main body 21 by heat welding, and the outer peripheral end 22b of the synthetic resin sheet 22 is fixed. The side is fixed to the inside of the door inner panel 102 by the butyl rubber 23 provided on the outside of the vehicle.
The synthetic resin sheet 22 is made of, for example, a PE (polyethylene) sheet and has a thickness of about 30 μm to 200 μm, which is considerably thinner than the thickness of the rubber sheet main body 21 (1 mm or more). Instead of the PE (polyethylene) sheet, PP (polypropylene), EVA resin (ethylene-vinyl acetate copolymer resin), or the like can also be used.

Butyl rubber 23 is a viscous paste that is applied using, for example, a caulking gun, and when applied, it is an adhesive that has an irregular cross section and consists of a string (string), and the outside of the vehicle is inside the door inner panel 102. It is attached by pressing.

A silicone film 30 is formed on the inner surface of the synthetic resin sheet 22.
As shown in FIG. 4A, the silicone film 30 has a checkered pattern and is formed so as to form a plurality of gaps M with respect to the synthetic resin sheet 22.
That is, the silicone film 30 is formed by forming squares having the same shape and the same size in a uniform pattern so that adjacent silicone films are in contact with each other at the corners.

As described above, since the silicone film 30 is formed so as to generate a plurality of gaps M on the inner side surface of the synthetic resin sheet 22, the synthetic resin sheet 22 is heat-welded to the rubber sheet main body 1 in the gaps M. The welded portion is indicated by reference numeral T.

Further, one side of the square forming the silicone film 30 and the square forming the gap M is 0.5 mm, and the maximum distance between the gaps M, here the diagonal length a is about 0.7 (= √2, 1). / 2 times) mm. Further, the ratio of the total area of the plurality of gaps M to the total area of the surfaces of the silicone film 30 was set to 50:50.

At this time, a peeling test was conducted on the weldability of the synthetic resin sheet 22 to the rubber sheet main body 21 with the silicone film 30 in between. As a result, the paper surface of FIG. 4A was found to have a lateral direction (x direction) of 12. The synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 with a tension of 0 (N / 25 mm), and the synthetic resin sheet is peeled off from the rubber sheet main body 21 with a tension of 11.7 (N / 25 mm) in the vertical direction (y direction). 22 was peeled off. In the industry, it is desired to have a peel strength of 8 (N / 25 mm) or more.
Here, the peeling test is a strip-shaped test piece including a portion having a welding width of 25 mm at an arbitrary position on the rubber sheet, which is punched out and collected together with the rubber sheet at a constant speed (200 mm / min). The load when the synthetic resin sheet 22 was pulled and peeled off in the 180 degree direction was measured.

Further, as shown in FIG. 3, the peelability of the butyl rubber 23 located on the lower side with respect to the synthetic resin sheet 22 with the silicone film 30 in between was also confirmed when the door hole seals 20 were stacked. No adhesion or transfer of the butyl rubber 23 was observed, which was good. This test was carried out after 2 days in an environment of 40 ° C., 1 day in an environment of 60 ° C., and again after 2 days in an environment of 40 ° C.

Therefore, it is easy even if the butyl rubber 23 of the lower door hole seal 20 suddenly touches and adheres to the upper door hole seal 20 when storing or transporting a plurality of door hole seals 20 on top of each other. Moreover, it can be peeled off cleanly.

As described above, the silicone film 30 formed on the inner side surface of the synthetic resin sheet 22 with a uniform dot coating pattern having a checkered pattern as shown in FIG. 4A is heat-welded to the synthetic resin sheet 22. It has a good balance of both the function of being excellent in properties and the function of being excellent in peelability to butyl rubber 23.
Table 1 summarizes the verification results of the peeling strength of welding to the rubber sheet main body 21 and the peelability to butyl rubber 23 by the above-mentioned film pattern of FIG. 4 and other film patterns described below. As shown in Table 1, the welding strength to the rubber sheet main body 21 was as high as 12 (N / 25 mm) without the silicone film (untreated synthetic resin sheet 22), but the peelability to the butyl rubber 23 was poor. Butyl rubber 23 has firmly adhered to the synthetic resin sheet 22. When the silicone film was applied to the entire surface without gaps, the peelability to the butyl rubber 23 was excellent, but the silicone film was not welded to the rubber sheet at all.

Here, as shown in FIG. 4A, one side of the square forming the silicone film 30 and the square forming the gap M is 0.5 mm, and the diagonal length a which is the maximum distance between the gaps M is a. Although it is shown that the size is about 0.7 mm, the same checkered pattern can be made into various sizes.
For example, in the one shown in FIG. 4B, even in the same checkered pattern, one side of the square forming the silicone film 30 and the square forming the gap M is 1.0 mm, and the diagonal line is the maximum distance between the gaps M. The length b of is about 1.4 (= √2) mm. The ratio of the total area of the plurality of gaps M to the total area of the surfaces of the silicone film 30 is 50:50.

At this time, a peeling test was conducted on the weldability of the synthetic resin sheet 22 to the rubber sheet main body 21 with the silicone film 30 in between. As a result, the paper surface of FIG. 4B was shown to be 11. The synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 by a tension of 5 (N / 25 mm) (a part of the rubber sheet main body 21 is destroyed), and 11.1 (N / 25 mm) in the vertical direction (y direction). The synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 (a part of the rubber sheet main body 21 is destroyed) due to the tension of the above, and the weldability is high.
Further, as shown in FIG. 3, the peelability of the butyl rubber 23 located on the lower side with respect to the synthetic resin sheet 22 with the silicone film 30 in between when the door hole seals 20 are stacked is as shown in Table 1. Although it was slightly inferior to the one shown in FIG. 4 (a), there was no particular problem in use.

Further, as shown in FIGS. 5A and 5B, the film pattern may be a uniform dot shape in which the planar shape of the silicone film 30 is circular.
In the one shown in FIG. 5A, the silicone film 30 has a diameter of 0.5 mm, the distance between the silicone films 30 adjacent to the left, right, front and back is also 0.5 mm, and the maximum distance c of the gap M is about 0. It is set to 9 mm. The ratio of the total area of the plurality of gaps M to the total area of the surfaces of the silicone film 30 is 80:20.
Further, in the one shown in FIG. 5B, the silicone film 30 has a diameter of 1.0 mm, the distance between the silicone films 30 adjacent to the left, right, front and back is 0.5 mm, and the maximum distance d of the gap M is about. It is set to 1.1 mm. The ratio of the total area of the plurality of gaps M to the total area of the surfaces of the silicone film 30 is 65:35.

At this time, when a peeling test was conducted on the weldability of the synthetic resin sheet 22 to the rubber sheet main body 21 with the silicone film 30 in between, as shown in Table 1, in the lateral direction with respect to the paper surface of FIG. 5A. The synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 by a tension of 11.6 (N / 25 mm) in the (x direction) (a part of the rubber sheet main body 21 is destroyed), and 12 in the vertical direction (y direction). The synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 by a tension of .2 (N / 25 mm) (a part of the rubber sheet main body 21 is destroyed), and the weldability is high.
Further, in the one shown in FIG. 5 (b), a synthetic resin sheet is formed from the rubber sheet main body 21 with a tension of 10.5 (N / 25 mm) in the lateral direction (x direction) with respect to the paper surface of FIG. 5 (b). 22 is peeled off (a part of the rubber sheet main body 21 is destroyed), and the synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 with a tension of 10.3 (N / 25 mm) in the vertical direction (y direction) (rubber sheet). A part of the main body 21 is destroyed), and the weldability is high.

Further, as shown in FIG. 3, the peelability of the butyl rubber 23 located on the lower side with respect to the synthetic resin sheet 22 with the silicone film 30 in between when the door hole seals 20 are stacked is described in FIG. It was the same as b), and although it was slightly inferior to the one shown in FIG. 4 (a), there was no particular problem in use. On the other hand, the one shown in FIG. 5 (b) is inferior in peelability as compared with the one shown in FIG. 5 (a), and traces of butyl rubber 23 can be seen on the synthetic resin sheet 22 and can be touched by hand. It is thought that it may become a problem depending on the usage environment because it is thinly soiled.

Further, as shown in FIGS. 6A and 6B, the planar shape of the silicone film 30 may be strip-shaped extending in one direction (y direction).
The one shown in FIG. 6A is a film pattern in which the silicone film 30 has a strip shape with a width of 0.5 mm and the distance between the silicone films 30 adjacent to the left and right is also 0.5 mm. The ratio of the total area of the plurality of gaps M to the total area of the surfaces of the silicone film 30 is 50:50.
Further, the one shown in FIG. 6B is a film pattern in which the silicone film 30 has a strip shape with a width of 0.5 mm and the distance between the silicone films 30 adjacent to the left and right is 1.0 mm. The ratio of the total area of the plurality of gaps M to the total area of the surface of the silicone film 30 is 2/3 (about 66): 1/3 (about 33).

At this time, a peeling test was conducted on the weldability of the synthetic resin sheet 22 to the rubber sheet main body 21 with the silicone film 30 in between. As a result, the paper surface of FIG. 6A was shown to be 11. The synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 by a tension of 5 (N / 25 mm) (a part of the rubber sheet main body 21 is destroyed), and 11.4 (N / 25 mm) in the vertical direction (y direction). The synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 (a part of the rubber sheet main body 21 is destroyed) due to the tension of the above, and the weldability is high.
Further, in the one shown in FIG. 6 (b), the synthetic resin sheet is formed from the rubber sheet main body 21 with a tension of 11.0 (N / 25 mm) in the lateral direction (x direction) with respect to the paper surface of FIG. 6 (b). 22 is peeled off (a part of the rubber sheet main body 21 is destroyed), and the synthetic resin sheet 22 is peeled off from the rubber sheet main body 21 with a tension of 11.2 (N / 25 mm) in the vertical direction (y direction) (rubber sheet). A part of the main body 21 is destroyed), and the weldability is high.

Further, as shown in FIG. 3, the peelability of the butyl rubber 23 located on the lower side with respect to the synthetic resin sheet 22 with the silicone film 30 in between when the door hole seals 20 are stacked is as shown in Table 1. The film pattern of FIG. 6 (a) was the same as that of FIG. 4 (b), and although it was slightly inferior to that shown in FIG. 4 (a), there was no particular problem in use. The film pattern of FIG. 6B was the same as that of FIG. 5B, and traces of the butyl rubber 23 were seen on the synthetic resin sheet 22, and when touched by hand, light stains were attached. I think that it may be a problem depending on the usage environment.

From the above, it can be considered as follows. That is, in each of the above-mentioned invention examples, there was no problem in the weldability of the synthetic resin sheet 22 to the rubber sheet main body 21, and the difference in superiority or inferiority occurred only in the peelability of the butyl rubber 23 with respect to the silicone film 30. Then, when the superiority or inferiority was analyzed from these above-mentioned examples, it was assumed that a circle Q having a diameter of 1 mm was assumed, and it was considered that the contact state of the circle Q with the silicone film 30 was related. This is the film pattern shown in FIG. 4A. When the circle Q is placed at the center of the gap M in which the checkered silicone film 30 does not exist, the four square portions of the silicone film 30 and the circle Q always overlap and contact each other. On the other hand, in the case of FIG. 4B, when the circle Q is placed at the center of the gap M, an overlapping portion is generated only by contacting the four square portions of the silicone film 30 at the boundary (barely). The film pattern of FIG. 4 (b), which is in contact only at this boundary (barely), is inferior in the peelability of the butyl rubber 23 as compared with the film pattern of FIG. 4 (a), which is in overlapping contact. It can be understood from that.

The film pattern of FIG. 5 (a) in which the evaluation of the peelability of the butyl rubber 23 in Table 1 is Δ is also a film pattern that contacts at the boundary (barely) of the circle Q. Then, when the circle Q is placed in the center of the gap M in which the silicone film 30 does not exist, the film pattern does not come into contact with each other. Q can explain that the classification of "overlapping contact", "contact at the boundary", and "non-contact" and the peelability of the butyl rubber 23 are related with a certain regularity. Here, the strip-shaped film pattern In this case, the peelability of the butyl rubber 23 is evaluated more in FIG. 6 (a), in which the circle Q always overlaps with the silicone film 30, and in FIG. It is high and it can be seen that it follows the above-mentioned regularity. However, it is considered that the strip shape that is sandwiched between the two sides is inferior to the one-sided pattern that surrounds the circle Q from all sides (four sides).

The following can be further inferred from this idea based on the circle Q.
As shown in FIGS. 7A and 7B, the planar shape of the silicone film 30 has a width of 0 extending in the horizontal direction (x direction) in addition to a strip extending in the vertical direction in one direction (y direction). The .5 mm strip may be formed at 0.5 mm intervals (FIG. 7 (a)) or 1.0 mm intervals (FIG. 7 (b)), that is, in a grid pattern.
In this case, as shown in FIG. 3, the peelability of the butyl rubber 23 located on the lower side with respect to the synthetic resin sheet 22 with the silicone film 30 in between when the door hole seals 20 are stacked is a circle having a diameter of 1 mm. Assuming Q, the circle Q is good because it always overlaps and contacts the silicone film 30 shown in FIG. 7A. On the other hand, the one shown in FIG. 7B is in contact with the silicone film 30 at the boundary (barely), and there is no overlapping contact portion, so that the one shown in FIG. 7B is compared with the one shown in FIG. 7A. The peelability is slightly inferior.

Further, as shown in FIG. 8, the silicone film 30 may be formed as a circle having a diameter of 1.0 mm so that a circle having the same shape and the same size may be formed adjacent to the circle, which is not shown. The silicone film 30 may be formed so that circular gaps M having a diameter of 1.0 mm are in contact with each other at their boundaries and are adjacent to each other.

Further, in the checkered pattern shown in FIGS. 4 (a) and 4 (b), each of the four corners of the square silicone film 30 is in contact with the corners of the four adjacent square silicone films 30. However, a gap may be provided between the corners.

As shown in FIG. 9, it is also conceivable to form the silicone film 30 on the entire surface of the vehicle interior side surface of the synthetic resin sheet 22 without any gaps.
In this case, by adjusting the concentration and film thickness of the silicone film 30, it is possible to maintain the releasability from the laminated butyl rubber 23 while ensuring the welding with the rubber sheet main body 21, but the synthetic resin sheet. It is necessary to adjust the density and film thickness so as to be uniform over a wide range of 22 surfaces, and high accuracy is required.

On the other hand, when the silicone film 30 is formed so as to form a plurality of gaps M with respect to the synthetic resin sheet 22, the rubber sheet main body 21 can be reliably welded to the synthetic resin sheet 22. Moreover, the strength of weldability can be maintained high.
At this time, the ratio of the total area of the plurality of gaps M to the total area of the surface of the silicone film 30 is preferably 40:60 to 95: 5, and more preferably 50:50 to 80:20.

It is also conceivable to form the silicone film 30 only on the opposite surface (inside the vehicle) corresponding to the position of the butyl rubber 23 provided on the outside of the vehicle of the synthetic resin sheet 22.
In this case, since it is inefficient to form the silicone film 30 having a different shape for each vehicle type, the silicone film is formed in a uniform pattern so as to generate a plurality of gaps over the entire surface of the synthetic resin sheet 22. It is preferable to do so.

10 Door hole seal 11 Rubber sheet main body 12 PE sheet 13 Butyl rubber 15 Release paper 20 Door hole seal 21 Rubber sheet main body 22 Synthetic resin sheet 22a Inner peripheral side 22b Outer peripheral side 23 Butyl rubber 30 Silicone film 100 Door 101 Door outer panel 102 Door Inner panel 103 Door trim H Opening M Gap T Welded part

Claims (8)

A rubber sheet main body is attached to the inside of the door inner panel via a synthetic resin sheet to cover the opening formed in the door inner panel, and the synthetic resin sheet is fixed to the rubber sheet main body. The outer peripheral end side of the synthetic resin sheet is a door hole seal fixed to the door inner panel by an adhesive member.
A door hole seal characterized in that a releasable film is formed on the inner side surface of the synthetic resin sheet so as to generate a plurality of gaps, and the synthetic resin sheet is welded to the rubber sheet main body. The door hole seal according to claim 1, wherein the planar shapes of the plurality of gaps are the same shape and the same size, and the release film is formed in a uniform pattern. The invention according to claim 1 or 2, wherein a plurality of planar shapes of the releasable film are provided in the same shape in a circle or a square and of the same size, and the releasable film is formed in a uniform pattern. Door hole seal. The door hole according to any one of claims 1 to 3, wherein the release film has a square planar shape so that the adjacent release films are in contact with each other at corners. sticker. The door hole seal according to any one of claims 1 to 3, wherein the release film has a circular planar shape so that the adjacent release films are in contact with each other. The door hole seal according to any one of claims 1 to 5, wherein the minimum distance between the plurality of gaps is set to 1 mm or less. The door hole seal according to any one of claims 1 to 6, wherein the ratio of the total area of the plurality of gaps to the total area of the surface of the silicone film is 40:60 to 95: 5. .. A synthetic resin sheet used for door hole seals that are fixed to the inner panel of automobile doors.
A synthetic resin sheet for door hole sealing, characterized in that a release film is formed on one surface so as to generate a plurality of gaps.