JPS5921814B2 - Decorative and protective molding - Google Patents

Abstract

PURPOSE:To permit the adhesive force of the adhesion layer formed on the back surface of a lace to be uniform on the whole surface and sufficient by forming the mountain-shaped bulged part over the range from the upper and the bottom parts of the lace body to the hollow part. CONSTITUTION:The mountain-shaped bulged parts 5 and 6 which face oppositely each other are projected, keeping a gap 7 at the top part, from the nearly center part of the upper and the bottom parts 4 of the lace body 1 which is made of vinyl chloride and has the adhesive layer 2 which consists of double-faced adhesive tape formed on the back surface. On both sides of the bulged parts 5 and 6, the dumbell- shaped hollow part 8 in communication through the gap 7 is formed. When the upper surface 3 of the body 1 is pushed, the bulged parts 5 and 6 contact each other, and when pressed further, small cavities 9 and 9 are crushed, and the pressing force is transmitted from the bulged part 5 to the bulged part 6, and further transmitted in spreading like an unfolded fan to the bottom part through the bulged parts 5 and 6, and the pressing force on the bottom part is made uniform.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a decorative and protective molding used for automobiles and the like, which protects the adherend itself when it comes into contact with other objects, and also prevents damage to the object with which it comes in contact.

More specifically, the present invention relates to an extruded decorative and protective molding having a hollow portion made of relatively large polymeric material.

Most of the side moldings used on the sides of automobiles are made of synthetic resin, and there has been a trend toward larger sizes in recent years.

With this increase in size, hollow moldings are becoming popular from the viewpoint of weight reduction and cost.

Synthetic resin moldings such as side moldings are generally attached to an adherend using double-sided adhesive tape.

In other words, one side of the double-sided adhesive tape is adhered to the back of the molding in advance, and the other side has a protective paper attached to it. If you want to attach it to an adherend, remove the protective paper and press the adhesive side to the adherend. and glue.

In moldings that use pressure-sensitive adhesives such as double-sided adhesive tape, when the molding body becomes larger, the adhesive force decreases due to the increased weight. Therefore, the molding body is made hollow to reduce the weight increase. It was necessary to prevent this and maintain adhesive strength.

Otherwise, pressure-sensitive adhesives with stronger adhesive properties had to be developed, or double-sided adhesive tapes had to be used in combination with other strong adhesives to prevent the adhesive strength from decreasing.

In addition to this decrease in adhesive strength, increasing the size of the molding results in an increase in the required materials and weight, and when used in automobiles, increased weight is undesirable from the standpoint of resource and energy conservation. As a response, hollow moldings were developed.

However, in the case of this hollow molding, if the material of the molding body is extremely soft with a hardness of 80 degrees or less (according to JIS K6301), an adhesive layer made of pressure-sensitive adhesive is formed on the bottom of the molding body by pressing from the surface of the molding body. However, such soft moldings do not have sufficient shape retention and are not sufficiently protective, and the molding itself is easily damaged. Not used in practical use, usually 85-97
Moldings with a hardness of approximately 100% hardness are used as side moldings for automobiles.

These moldings are made of a polymeric material such as vinyl chloride resin or thermoplastic urethane by extrusion molding, and the adhesive layer described above is formed on the back surface after molding.

When attaching such a large hollow molding made of a soft but somewhat hard material to an adherend, the pressing force is not applied uniformly to the entire bottom surface, and the pressing force is not applied to the bottom along the side walls. However, in some cases, there may be a portion in the center of the bottom surface where almost no pressing force is applied.

In any case, the adhesive strength of the adhesive layer is large at both ends with side walls relative to the cross section of the mold body, and the adhesive strength decreases toward the center (inside), so the adhesive strength is sufficient for the entire mold. It can not be said.

For this reason, when this hollow molding is used as a side molding of a car, the molding is not firmly adhered to the car body, and may fall off due to expansion and contraction of the molding due to temperature differences between day and night, summer and winter, and vibrations when the car is running. There was a possibility.

In this invention, when a hollow molding is attached to the above,
The pressing force applied to any part of the molding body in the width direction is transmitted almost uniformly over the entire bottom surface of the molding, and the adhesive force of the adhesive layer formed on the back surface of the molding is obtained to the same extent over the entire surface. To provide a decorative/protective molding which can sufficiently perform its functions, and which also reduces the weight of the molding itself, saves materials, and has protection effects such as cushioning properties that are hardly hindered compared to conventional hollow moldings.

The gist of this invention is a molding made of a polymeric material and bonded to an adherend by forming an adhesive layer on the back side of the molding body extruded into a hollow shape. A pair of protruding protrusions facing each other may be formed, and the width of each protrusion may be gradually increased toward the top and bottom of the molding body, or the pair of protrusions may be connected to each other at their tops. It is a decorative and protective molding that is joined to form a joint with a flattened cross section.

The material of the decorative and protective molding of this invention is vinyl chloride resin,
A soft polymeric material having a hardness of about 85 to 97 degrees (according to JIS K6301), such as acetic acid butyrate cellulose resin, ABS resin, or thermoplastic urethane, is used.

Nowadays, vinyl chloride resin is generally used from the viewpoint of moldability and cost.

In this case, it is preferable to add a foaming agent to cause fine foaming, as this improves the feel and cushioning properties, and also reduces the weight and material by lowering the density.

Regarding the hardness, the above range only indicates the preferable range when applied as a side molding for automobiles, and even if it is soft below the above range, or hardness is above the above range. should be appropriately selected depending on the use (place of application), and is not limited to this range in any way.

Embodiments of the present invention will be described below based on the drawings.

FIG. 1 shows a first embodiment of a decorative and protective molding according to the present invention, in which a molding body 1 is made of vinyl chloride resin, and an adhesive layer 2 made of double-sided adhesive tape is formed on the back surface of the molding body 1.

Mountain-shaped bulges 5 and 6 are provided opposite to each other from the top 3 and bottom 4 of the molding body, with a slight gap 7 at the top of each protrusion. The width is gradually increased in the direction of the upper part 3 and the bottom part 4, and a dumbbell-shaped hollow part 8 is connected to both sides of the bulged parts 5 and 6 with a gap 7.
have.

Numerals 9 and 9 are small voids to prevent sink marks on the surface that tend to occur in particularly thick molded parts.

The adhesive layer 2 made of double-sided adhesive tape is made of a base material made of neoprene or butyl rubber foam impregnated with an acrylic adhesive, etc., and is usually fixed on one side of the adhesive surface on the back side after molding the mold body. is adhered, and the other side is covered with a removable protective paper, so that the protective paper can be peeled off and adhered when adhering to the adhered surface.

FIG. 2 shows a second embodiment of the decorative and protective molding of the present invention, in which a molding body 10 has a flattened connecting portion 11 formed from an upper part 13 and a bottom part 14.

This connecting portion 11 is similar to the bulging portion 5 in FIG.
The gap 7 caused by the connection part 6 is eliminated and the parts are integrally joined, and the hollow parts 12, 12 are formed on both sides of the connecting part 11.

Both base portions of the connecting portion 11 widen toward the upper portion 13 and the bottom portion 14 of the molding body 10, and a small gap 9 is formed inside the thick portion.

FIG. 3 shows a third embodiment of the decorative and protective molding of the present invention, in which the molding body 20 has a connecting part 21 and hollow parts 22 and 22 on both sides of the connecting part 21. ), but without the small cavities 9, 9 formed in the thickened part, instead there are recesses 25.2 in the top surface 23 and bottom 24.
6 is formed, and the wall thickness is designed to be approximately constant, so that even if sink marks occur, they are absorbed by the recesses and the function is not impaired.

Next, the manner of use of the above embodiment will be explained.

When attaching a decorative and protective molding to an adherend, such as the side wall of an automobile body, taking the molding of the first embodiment as an example, the protective paper of the adhesive layer 2 of the molding body 1 is peeled off, and the molding is positioned at a predetermined location. By pressing the upper surface 3 of the molding body 1, the adhesive surface of the adhesive layer 2 adheres to the adherend.

At this time, if the upper surface 3 of the molding body 1 is pressed, the bulge 5 will surely come into contact with the bulge 6 of the bottom 4 no matter which part in the width direction is pressed. 9, the crushing pressing force is transmitted from the bulging portion 5 to the bulging portion 6.

At this time, the pressing force is transmitted to the bottom of the molding from three points, the both side walls of the molding body 1 and the central bulging part, that is, the entire widthwise direction, and the pressing force is transmitted through the bulging parts 5 and 6 at the center of the molding. Since the transmission is transmitted to the bottom in a shape that spreads toward the bottom, the pressing force is approximately uniform over the entire bottom width direction, and the adhesive force of the adhesive layer 2 can be fully utilized to bond the molding to the adherend.

The moldings of the second and third embodiments are similar to the above, but since the upper and bottom parts of the molding body 10.20 are connected by the connecting parts 11 and 21 from the beginning, the bulge of the first embodiment The same mode is shown starting from the state in which 5 and 6 are joined.

Since the decorative and protective molding of the present invention has the above-described structure, when it is attached to an adherend, the pressing force applied to the upper part of the molding body at any position in the width direction is reduced to the bulge part or each part. Since the adhesive is applied almost uniformly to the entire surface of the adhesive layer formed on the bottom of the molding body through the upper half of the connecting part, the adhesive function of the adhesive layer can be fully exerted over the entire surface, and a strong adhesive force can be obtained.

Therefore, it is possible to prevent the molding from falling off due to poor adhesion.

In addition, in the case of relatively hard soft moldings, since a bulge or a connecting part is formed in the center of the hollow part of the molding body, pressing force can be applied from the surface of the molding even after it is attached to the adherend. can be transmitted to the entire surface of the adhesive layer, and even if the adhesive strength decreases due to the molding's own weight, expansion/contraction action, vibration, etc., it has the effect of reinforcing it and returning the adhesive strength to its original state. .

[Brief explanation of the drawing]

1 to 3 are cross-sectional views showing different embodiments of the decorative and protective molding of the present invention. 1.10,20... Mall body, 2...
・Adhesive layer, 3.13, 23...Top of the molding body, 4,14°24...Bottom of the molding body, 5,6
...Bulging part, 11.21...Connection part,
8, 12, 22...Hollow part.

Claims (1)

[Claims] 1. In a molding made of a polymeric material and bonded to an adherend by forming an adhesive layer on the back side of the molding body extruded into a hollow shape, the upper and bottom parts of the molding body are hollow. A decorative and protective molding having a structure in which a pair of bulging parts protruding into the molding part and facing each other is formed, and the width of each bulging part is gradually increased toward the top and bottom of the molding body. 2. In a molding made of a polymeric material and bonded to an adherend by forming an adhesive layer on the back side of the molding body extruded into a hollow shape, the upper and bottom parts of the molding body protrude into the hollow part and are opposed to each other. A pair of bulges are formed, and the width of each bulge is gradually increased toward the top and bottom of the molding body, and the pair of bulges are joined to each other at their tops to form a cross-sectional tympanic membrane. A decorative and protective molding with a shape that forms a joint.