JP2006096331A - Synthetic resin-made film for glass laminate, its manufacturing method, and glass laminate using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To solve a problem that a peep hole for a monitor camera is required for a shade part provided on an upper edge of a windshield of an advanced safety car with a monitor system of a road condition mounted thereon, and bubbles and vision distortion are present in a boundary of a translucent part provided in the shade part in a method for manufacturing the windshield by fitting a transparent synthetic resin-made film in a synthetic resin-made film with a window opened in the shade part. <P>SOLUTION: A windshield is manufactured by firstly manufacturing a synthetic resin-made film for a glass laminate having a translucent part in a shade part through adhesion, and secondly laminating the synthetic resin-made film between a plurality of glass plates. The synthetic resin-made film with the shade part and the translucent part adhered thereto is manufactured by forming a hole of a substantially same shape as that of the translucent part for monitoring at a predetermined position of the shade part, fitting the transparent synthetic resin-made film of the substantially same shape as that of the hole therein, heating a butted boundary part with hot air to soften and adhere the synthetic resin, and cooling the boundary part to integrate the synthetic resin. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a synthetic resin film for laminated glass, a method for producing the same, and a laminated glass and an automobile using the same.

  2. Description of the Related Art Conventionally, an automobile windshield is called a shade band for preventing glare from sunlight, and has a colored area (colored band) having a uniform concentration or a gradient at its upper edge.

  However, windshields with a colored area on the upper edge have a problem that the vehicle-inspected marks and periodic inspection marks affixed to the inside are difficult to see from the outside. Kaihei 2-61941 discloses a laminated glass in which a translucent portion (transparent window) is formed in a colored region (Patent Document 1).

  Also, a synthetic resin film is cut out to open a window, a synthetic resin film thinner than the surrounding and a hologram are fitted into the window, and this synthetic resin film is laminated and bonded between two glass plates. And its manufacturing method is disclosed in Japanese Patent Laid-Open No. 5-60919 (Patent Document 2).

  This technical document does not disclose a laminated glass in which a light-transmitting portion is formed in a colored region and a manufacturing method thereof. However, a synthetic resin film having a colored area formed on the upper edge is widely used as a synthetic resin film for producing laminated glass with a shade band. Therefore, a part of the synthetic resin film in the colored area is cut off. Open a window, fit a transparent synthetic resin film of the same thickness in the window, and laminate and bond this synthetic resin film between two glass plates to form a transparent part in the colored area. Glass can be easily produced.

  In addition, the manufacturing method of the hologram encapsulated laminated glass described in Patent Document 2 is hereinafter simplified and referred to as an “inset method”, and this method is applied to form a translucent portion in the colored region. The method for producing the laminated glass is also called “inset method”.

In addition, the translucent part formed in the colored area of the laminated glass can be used not only to make the inspection mark easy to see from the outside, but also as a viewing window for a CCD camera in a monitoring system for advanced safety vehicles. In recent years, a monitoring system for detecting a white line on a road by a CCD camera provided on an inner mirror of an automobile has been developed (Non-Patent Document 1). The windshield may be provided with a colored region called a shade band on the inner mirror. In this case, the shade band lowers the contrast of the white line and hinders detection by the CCD camera. For this reason, in the surveillance system for advanced safety vehicles, it is necessary to provide a translucent part in the shade band as a viewing window for the CCD camera.
Japanese Utility Model Publication No. 2-61941 Japanese Patent Laid-Open No. 5-60919 Sadano et al., “Lane Keep Support System”, Automotive Technology, November 2001, p36-p41

The colored region described in Patent Document 1 is formed on at least one of a synthetic resin film or a glass plate, and the coloring method is gravure, letterpress, offset, intaglio, stencil, collotype, screen, flexo, etc. It is a printing method. However, since these printing methods are not used in the automobile window glass production line, in order to produce a laminated glass having a light-transmitting portion formed in a colored region by the printing method described in Patent Document 1. However, there is a problem that a change in the manufacturing process and a large amount of capital investment are indispensable.

  In addition, by applying the method for producing a hologram-enclosed laminated glass described in Patent Document 2, a laminated glass having a translucent part formed in a colored region can be easily produced. However, in this fitting method, a synthetic resin film in which a part of the colored area is cut out and a window is opened and a transparent synthetic resin film having the same shape as the window are prepared in advance. In a laminating process sandwiched between two glass plates, a synthetic resin film with a window in the colored area is placed on the glass plate, and a transparent synthetic resin film is inserted into the window. It took extra time. For this reason, there has been a problem that this lamination process becomes rate-determining and the production tact of the entire laminated glass production line is greatly reduced.

  In addition, there is a problem that a transparent synthetic resin film fitted into a synthetic resin film having a window in a colored region in this lamination process or a subsequent process is detached from the window, which also hinders the production of laminated glass.

  In addition, in the laminating process in which the synthetic resin film is sandwiched between two glass plates, a synthetic resin having a transparent synthetic resin film with a window in the colored area is used in order to avoid an increase in work time for fitting the transparent synthetic resin film. When stored in a film, there was a problem that the transparent synthetic resin film embedded in the window of the colored area was detached from the window during storage.

  In addition, a transparent synthetic resin film embedded in a synthetic resin film with a window in the colored area has a large gap at the boundary when left for a long period of time while sandwiched between multiple glass plates. Bubbles may be generated in the crimping process, which hinders the production of laminated glass.

  Furthermore, a gap or a step may remain between the synthetic resin film having a window in the colored area and the transparent synthetic resin film fitted in the window. In this case, the synthetic resin film is made of two pieces of glass. The laminated glass formed after the laminating process sandwiched between the plates and the thermocompression bonding process in which this laminated body is put in an autoclave and heated and heated is bonded to the boundary of the translucent part provided in the colored area. Bubbles remained or defects such as perspective distortion entered, which was not preferable in terms of appearance and safety.

  The object of the present invention is to propose a synthetic resin film for laminated glass in which a translucent portion is provided in a colored region without changing the production line such as installation of a printing apparatus, a method for producing the same, and a laminated glass using the same. In addition, in order to avoid an increase in working time in the laminating process in which the synthetic resin film is sandwiched between two glass plates, the colored area and the light-transmitting portion are strongly bonded, and the synthetic resin film has a clean appearance. Proposes a manufacturing method, and further proposes a method for manufacturing laminated glass in which defects such as bubbles and perspective distortion do not enter the boundary of the light-transmitting part provided in the colored region, and the boundary is not conspicuous It is.

  The present invention was made for the purpose of solving the above-mentioned problems, and in a synthetic resin film used for laminated glass for a windshield of an automobile in which a colored region that becomes a shade band is formed on at least a part of the surface, A synthetic resin film for laminated glass, characterized in that a light-transmitting part for monitoring a road condition with a camera is provided in a colored area.

  In addition, the present invention provides a transparent synthetic resin having substantially the same shape as the hole in a hole provided in the colored region of the synthetic resin film in which the colored region is formed at a predetermined position in the colored region. The laminated glass is provided with a translucent portion in the colored region described above, wherein a film is inserted and a boundary portion between the synthetic resin film having the colored region and the transparent synthetic resin film is bonded. It is a manufacturing method of a synthetic resin film. Here, “substantially the same shape” indicates that not only the opening surface of the hole of the synthetic resin film but also the cross-sectional shape thereof, that is, the thickness of the synthetic resin film is substantially the same.

  Further, the present invention is characterized in that the gap between the hole provided in the synthetic resin film having the colored region and the transparent synthetic resin film fitted in the hole is 1 mm or less, It is a manufacturing method of the synthetic resin film for laminated glasses which provided the translucent part in the area | region.

  Further, the present invention is characterized in that the difference between the thickness of the peripheral portion of the hole provided in the colored synthetic resin film and the thickness of the edge of the transparent synthetic resin film is 100 μm or less. It is a manufacturing method of the synthetic resin film for laminated glass of description.

  In addition, the present invention is such that the adhesion between the synthetic resin film having the colored region and the transparent synthetic resin film allows the organic resin to permeate the boundary portion of the synthetic resin film that abuts each other to dissolve the synthetic resin at the boundary portion. Then, the method for producing a synthetic resin film for laminated glass according to the above, wherein the synthetic resin at the boundary portion is solidified by drying an organic solvent.

  Further, in the present invention, the adhesion between the synthetic resin film having a colored region and the transparent synthetic resin film softens and adheres the synthetic resin at the boundary portion by heating the boundary portion, and then the boundary portion is bonded. The method for producing a synthetic resin film for laminated glass according to the above, wherein the synthetic resin is integrated by cooling.

  Further, the present invention provides the synthetic resin film for laminated glass according to the above, wherein the boundary portion between the synthetic resin film having a colored region and the transparent synthetic resin film is heated by blowing hot air. It is a manufacturing method.

  Furthermore, the present invention is a laminated glass produced using the synthetic resin film for laminated glass described above.

  According to the present invention, the laminated glass is composed of only two sheet glasses and a synthetic resin film sandwiched between them, as in the prior art, and the printed colored film described in Patent Document 1 is unnecessary. Therefore, the manufacturing process of the laminated glass is the same as that of the prior art, and the laminated glass can be manufactured on an existing line.

  Further, according to the present invention, the synthetic resin film provided with the translucent part in the colored region is transparent to the synthetic resin film window formed by cutting and opening a part of the colored region. Since the synthetic resin film is fitted and bonded, the boundary line of the window is not bonded in the thermocompression process compared to the case where the synthetic resin film is cut out and the window is opened. There are no problems such as curving and breaking, and there is no problem in the safety of the window part such as impact resistance and perspective distortion as laminated glass for vehicles.

  Further, according to the present invention, the synthetic resin film provided with the translucent part in the colored area is composed of a synthetic resin film obtained by cutting out a part of the colored area and opening a window, and a transparent synthetic film having substantially the same shape as the window. Since the boundary with the resin film is bonded, in the laminating process in which the synthetic resin film is sandwiched between the two glass sheets, the work time for inserting the transparent synthetic resin film into the synthetic resin film having a window in the colored area No longer needed. For this reason, it has been possible to avoid that the lamination process becomes a rate-determining factor for the entire production line and the production tact of laminated glass is greatly reduced.

  Further, according to the present invention, the synthetic resin film provided with the translucent part in the colored area is composed of a synthetic resin film obtained by cutting out a part of the colored area and opening a window, and a transparent synthetic film having substantially the same shape as the window. The interface with the resin film is bonded with an organic solvent, and the appearance is also clean. There is no gap between the synthetic resin film having a window in the colored region and the transparent synthetic resin film fitted in the window, and no gap or step is formed at the boundary. For this reason, the laminated glass completed through the thermocompression bonding process is free from defects such as bubbles, which are undesirable in terms of appearance and safety, at the boundary of the translucent portion provided in the colored region.

  Further, according to the present invention, the synthetic resin film provided with the translucent part in the colored area is composed of a synthetic resin film obtained by cutting out a part of the colored area and opening a window, and a transparent synthetic film having substantially the same shape as the window. Although the boundary surface with the resin film is adhered by an organic solvent, the organic solvent volatilizes after dissolving the synthetic resin film, so that chemical components other than the synthetic resin film do not enter the boundary surface. For this reason, the laminated glass completed through the thermocompression bonding process is free from defects that are undesirable in terms of appearance, such as perspective distortion, at the boundary of the translucent part provided in the colored region.

  Further, according to the present invention, the synthetic resin film provided with the translucent part in the colored area is composed of a synthetic resin film obtained by cutting out a part of the colored area and opening a window, and a transparent synthetic film having substantially the same shape as the window. The interface with the resin film is bonded by hot air, and the appearance is also beautiful. There is no gap between the synthetic resin film having a window in the colored region and the transparent synthetic resin film fitted in the window, and no gap or step is formed at the boundary. For this reason, the laminated glass completed through the thermocompression bonding process is free from defects that are undesirable in terms of appearance and safety, such as bubbles and perspective distortion, at the boundary of the light transmitting portion provided in the colored region.

  Furthermore, according to the present invention, the synthetic resin film provided with the light-transmitting portion in the colored area is composed of a synthetic resin film obtained by cutting a part of the colored area and opening a window, and a transparent synthetic film having substantially the same shape as the window. The boundary surface with the resin film is bonded only by hot air, and chemical components other than the synthetic resin film do not enter the boundary surface. For this reason, the laminated glass completed through the thermocompression bonding process is free from defects that are undesirable in terms of appearance, such as perspective distortion, at the boundary of the translucent part provided in the colored region.

  Embodiments of the present invention will be described below with reference to the drawings. 1 to 10 show an embodiment of the present invention. FIG. 1 is a plan view showing a laminated glass according to one embodiment of the present invention. In FIG. 1, 1 is a windshield, 1a is a shade band colored on the upper edge of the windshield, and 1b is a translucent part opened in a part of the shade band.

  2-10 is a figure explaining the manufacturing process of a synthetic resin film.

  First, as shown in FIG. 2, the windshield drawing 2 is stretched and placed on a work table (not shown). In the drawing 2 of the windshield, the outline 2a of the windshield, the outline 2b of the windshield, that is, the outline 2b of the shade band, the outline 2c of the translucent part opened in a part of the colored area, and the like are drawn.

  Next, as shown in FIG. 3, a transparent plate 3 is placed on the figure showing the outline 2c of the window opened in a part of the colored area. It is essential that the plate 3 placed on the figure showing the window be able to see through the drawing 2 of the windshield when viewed from above. Further, it is desirable that the material is of a high hardness that does not easily scratch the surface with a blade such as a cutter knife, and is lightweight and inexpensive. In general, a plate glass or an acrylic plate is used for the transparent plate 3. The size of the transparent plate 3 is such that it covers at least the outline 2c of the window drawn in the windshield drawing 2 and is, for example, 300 mm × 300 mm, but may cover the entire windshield drawing 2.

  Next, as shown in FIG. 4, a synthetic resin film 4 with a shade is placed on the transparent plate 3. The shaded synthetic resin film 4 is cut slightly larger than the windshield, and covers the outline 2a of the windshield. The synthetic resin film 4 is translucent, and the outline 4b of the shade of the synthetic resin film 4 is matched with the outline 2b of the shade band drawn in the drawing 2 of the windshield while seeing through the drawing 2 of the windshield.

  The windshield provided with the shade band is molded so that the upper edge and the lower edge of the colored portion are parallel from the aesthetic and functional aspects. However, in the ribbon-shaped synthetic resin film, the shade band is colored along the longitudinal direction of the ribbon. Therefore, when manufacturing a windshield having a curved upper edge, the synthetic resin film 4 with a shade is generally used. In particular, the colored portion is extended in a fan shape so that the lower edge thereof is parallel to the upper edge portion of the windshield. The synthetic resin film extended in a fan shape has a wedge-shaped cross section in the vertical direction of the windshield, and there is a difference of 10 to 30 μm in the thickness of the synthetic resin film above and below the hole whose length of the vertical side is about 100 mm. Yes.

  Next, as shown in FIG. 5, a transparent synthetic resin film 5 is placed on the synthetic resin film 4 with a shade. The transparent synthetic resin film 5 is at least large enough to cover the window outline 2c depicted in FIG. 2 of the windshield, and is placed so as to cover the window outline 2c.

  The transparent synthetic resin film 5 and the shaded synthetic resin film 4 may be extended in a fan shape in the same manner as the shaded synthetic resin film 4 so that the thicknesses of the synthetic resin film 4 and the shaded synthetic resin film 4 coincide. desirable. However, the transparent synthetic resin film 5 is generally not formed into a fan shape but a film having a uniform thickness is used. In that case, as will be described later, it is inevitable that a step of several tens of μm occurs at the boundary between the transparent synthetic resin film 5 and the synthetic resin film 4 with shade.

  Next, as shown in FIG. 6, the template 6 is placed on the transparent synthetic resin film 5. The template 6 is a copying type that cuts through substantially the same shape as the window drawn in FIG. 2 of the windshield. The material is preferably of a high hardness that is hard to be damaged by a blade such as a cutter knife, and is light and inexpensive. In general, a metal plate such as aluminum is used for the template 6. The size of the template 6 is at least enough to cover the outline 2c of the window drawn in the drawing 2 of the windshield.

  Next, the two synthetic resin films 4 and 5 superposed along the template 6 are simultaneously cut with the knife 7. The state of cutting is shown in the sectional view of FIG.

  Next, as shown in FIG. 8, the template 6 and the synthetic resin film 5 are removed from the synthetic resin film 4, and the cut synthetic resin film 4p with shade and the cut transparent synthetic resin film 5p are extracted with tweezers. The cut synthetic resin films 4p and 5q shown in FIG. 8 are discarded.

  Next, as shown in FIG. 9, the cut transparent synthetic resin film 5p is fitted into the window of the synthetic resin film 4q in which a part of the colored area is cut and a window is opened. As shown in FIG. 9A, there are no gaps or steps between the two synthetic resin films 5p and 4q.

  The gap as shown in FIG. 9B is caused by the difference between the size of the cut synthetic resin film 4q and the size of the synthetic resin film 5p. If this gap is significant, perspective distortion remains at the boundary after the laminated glass is finished. When this gap is 1 mm or more, bubbles are enclosed in the laminated glass when it is processed into a laminated glass, resulting in a defect. Alternatively, when the thickness of the laminated glass is locally reduced and the object is visually observed through the boundary between the transparent synthetic resin film 5p and the synthetic resin film 4q with shade, there is a problem that the object looks distorted due to the lens effect. . Therefore, this gap needs to be 1 mm or less. If this gap is 300 μm or less, the perspective distortion is hardly noticeable, so the gap is preferably 300 μm or less.

  Further, the step as shown in FIG. 9C is caused by the difference between the size of the cut synthetic resin film 4q and the size of the synthetic resin film 5p. If this step is significant, perspective distortion remains at the boundary after the laminated glass is finished. If this level difference is 100 μm or more, the synthetic resin film distorted when processed into laminated glass is strongly crushed between the glasses, and the thickness of the laminated glass increases locally. Therefore, the transparent synthetic resin film 5p and the shade When the object is visually observed through the boundary portion with the attached synthetic resin film 4q, there is a problem that the object appears to be distorted due to the lens effect. Therefore, this step needs to be 100 μm or less. If this step is 50 μm or less, the perspective distortion is hardly noticeable, and therefore the step is preferably 50 μm or less.

  Further, the step as shown in FIG. 9D is caused by a difference between the thickness of the cut synthetic resin film 4q and the thickness of the synthetic resin film 5p. If this step is significant, perspective distortion remains at the boundary after the laminated glass is finished. If this level difference is 100 μm or more, the thicker synthetic resin film is strongly crushed between the glass when processed into laminated glass, and the thickness of the laminated glass is locally increased. When the object is visually observed through the boundary with the synthetic resin film 4q with shade, there is a problem that the object looks distorted due to the lens effect. Therefore, this step needs to be 100 μm or less. If this step is 50 μm or less, the perspective distortion is hardly noticeable, and therefore the step is preferably 50 μm or less.

  Next, as shown in FIG. 10, hot air is blown to the boundary between the two synthetic resin films 5p and 4q to bond the two synthetic resin films 5p and 4q. As the hot air generator 9, for example, a hand-type industrial dryer having a normal temperature of 500 ° C. and a heater of about 1000 W can be used. When the temperature of the hot air is set to 400 ° C. to 500 ° C. and the distance between the hot air outlet of the dryer and the synthetic resin film is kept at 10 mm to 30 mm, the surface temperature of the synthetic resin film is 30 ° C. to 60 ° C. On the other hand, the temperature of the back surface is about 1 to 5 ° C. lower than the surface temperature. Further, the entire length of the boundary line between the two synthetic resin films 5p and 4q is, for example, 500 mm, and the time for blowing the hot air around the boundary boundary of this length is about 5 seconds to 10 seconds. . Next, the synthetic resin is integrated by the boundary portion by means such as air cooling or by allowing it to cool at room temperature.

  The synthetic resin film 8 having a translucent portion in the colored region is completed by the above operations and conditions.

As the synthetic resin film used for the laminated glass according to the present invention, for example, polyvinyl butyral (PVB) is used. The thickness is, for example, 0.38 mm or 0.76 mm. The surface is provided with irregularities for deaeration when thermocompression bonding with the plate glass. For this reason, the appearance color of the synthetic resin film is a translucent cloudy color. The term “transparent” as used herein is not only completely colorless and transparent, but also includes a semi-transparent white turbid color for a synthetic resin film, and a color that is nearly transparent for a laminated glass or a color that is lighter than the surrounding colored area. Contains meaning.

  The synthetic resin film has a viscoelasticity abruptly decreasing near 20 ° C., and becomes soft and viscous at 30 ° C. to 60 ° C. Therefore, the two synthetic resin films 5p and 4q are adhered to each other by softening the boundary between the two synthetic resin films 5p and 4q. The temperature at which the adhesive is adhered is slightly higher than room temperature, and heat is quickly transferred to the inside of the synthetic resin film, so that there is almost no temperature difference between the front surface and the back surface of the synthetic resin film. For this reason, the work time is short, and the entire cross section of the boundary section sticks evenly, the adhesive strength is large, and the appearance is clean.

  In addition, the boundary surface between the synthetic resin film in which a part of the colored area is cut out and the window is opened and the transparent synthetic resin film having the same shape and the same thickness as the window are bonded only by hot air. Chemical components other than the synthetic resin film do not enter the glass. Therefore, the laminated glass in which such a synthetic resin film is sandwiched through the thermocompression bonding process does not have a defect which is not preferable in terms of appearance such as perspective distortion at the boundary of the light transmitting portion provided in the colored region.

  Furthermore, the bonding method for blowing hot air can be regarded as a non-contact type because the only thing in contact with the boundary between the two synthetic resin films 5p and 4q is warm air. Foreign matter does not enter. Therefore, the laminated glass in which such a synthetic resin film is sandwiched through the thermocompression bonding process does not cause defects such as lint that are not preferable in terms of appearance, such as lint, at the boundary of the light transmitting portion provided in the colored region.

  The synthetic resin film 8 having a translucent portion in the colored region described so far can be manufactured and stored on a line different from the existing laminated glass manufacturing line. There is no problem that the bonded portion is removed during storage or in the laminating process sandwiched between two plate glasses. Therefore, the laminated glass having a translucent part in the colored area has a uniform concentration in the existing synthetic glass film, that is, the transparent synthetic resin film without the colored area or the upper edge in the existing laminated glass production line. The synthetic resin film in which a colored region having a gradient or a gradient is formed can be produced simply by replacing the synthetic resin film 8 having a translucent portion in the colored region.

  About the manufacturing method of the laminated glass which has a translucent part in a coloring area, it is set as the laminated body which pinched | interposed the synthetic resin film 8 which has a translucent part in a coloring area between several plate glass, and this laminated body is used. Heating and pre-adhering by passing through a pressure roll, then placing in an autoclave, heating and pressurizing and thermocompression bonding. The adhesion conditions of the autoclave are 1.0 to 1.5 MPa, 110 to 150 ° C., and about 30 to 60 minutes.

  In the embodiment of the present specification, the synthetic resin film was cut by using two templates of the synthetic resin films 4 and 5 at the same time using a template and a knife. You may cut them one by one. In addition to a template and a knife, a cutting machine or the like may be used as the cutting tool.

  In the examples of the present specification, the synthetic resin film is adhered by blowing hot air. However, the present invention is not limited to this method, and an organic solvent such as alcohols and ketones is used as a boundary between the synthetic resin films 5p and 4q. You may apply to. The synthetic resin films 5p and 4q fitted with the organic solvent penetrate into the interface where the synthetic resin films 5p and 4q meet, and then the surfaces of the synthetic resin films 5p and 4q are once dissolved, and further the organic solvent is volatilized, whereby two synthetic resins are obtained. The films 5p and 4q are bonded.

  When the two synthetic resin films 5p and 4q are bonded, the organic solvent dissolves the synthetic resin film and then volatilizes without staying at the butt boundary part of the synthetic resin film. Therefore, the boundary component is the original synthetic resin film. The chemical component other than the synthetic resin film does not enter the boundary surface. Laminated glass in which such a synthetic resin film is sandwiched through a thermocompression bonding process has no risk of seeing-through distortion caused by different components at the boundary of the light-transmitting portion provided in the colored region. This is preferable.

  Examples of organic solvents include alcohols such as methanol, ethanol, and isopropanol, ketones such as acetone, methyl ethyl ketone, and diethyl ketone, and ethers such as ethyl ether and isopropyl ether. Can be used for gluing.

  Since the organic solvent is required to easily permeate the boundary where the synthetic resin film is abutted, the organic solvent is desirably low in viscosity.

  In order to adhere the synthetic resin film, an adhesive such as cyanoacrylate can also be used. However, since the adhesive contains not only an organic solvent that does not volatilize after dissolving the synthetic resin but also a solid content, the solid content of the adhesive remains at the butt boundary portion of the synthetic resin. Such a laminated glass sandwiched with a synthetic resin film may have a perspective distortion due to the solid content of the adhesive, which is not preferable in terms of appearance and safety. For this reason, it is preferable to use an organic solvent such as alcohol rather than an adhesive for bonding the synthetic resin film.

  In addition, the synthetic resin film is adhered by contacting the surface of the two synthetic resin films 5p and 4q by bringing a thermal iron or a heat roll into contact with the surface so as to cross the boundary between the two synthetic resin films 5p and 4q. It may be done by wearing. As the thermal iron, for example, a sewing spatula with a heater of about 20 W can be used. When the length of the boundary line where the synthetic resin film abuts is, for example, 500 mm, the time for partially bonding the surface of the synthetic resin film by contacting the thermal iron every approximately 10 mm along the boundary line is about 1 minute. is there. Next, the synthetic resin is integrated by the boundary portion by means such as air cooling or by allowing it to cool at room temperature.

  When the surface temperature of the thermal iron is set to 100 ° C. to 130 ° C. and brought into contact with the surface of the synthetic resin film, the surface of the synthetic resin film melts, and after cooling, the surface of the synthetic resin film adheres and a dent remains. If this depression is slight, defects such as bubbles and perspective distortion do not enter the laminated glass sandwiching the synthetic resin film. Therefore, it is important to perform the bonding work with a thermal iron skillfully in a short time. However, bonding with a thermal iron requires skill of the work, and since there are large variations in bonding quality depending on the operator, it is preferable to use hot air rather than a thermal iron for bonding the synthetic resin film.

  Further, the synthetic resin film may be adhered by being immersed in warm water or hot water of about 30 ° C. to 80 ° C.

  The bonding method using an organic solvent and an adhesive, the bonding method using a hot iron and a hot roll, and the bonding method using hot water are substantially the boundary between the synthetic resin films 5p and 4q in which the organic solvent and the hot iron are substantially two. It is a contact type that contacts. On the other hand, the bonding method in which hot air is blown in a non-contact manner has almost no risk of stains or dirt adhering to the boundary between the two synthetic resin films 5p and 4q. Therefore, the bonding method uses an organic solvent or a thermal iron. Is also preferable.

The top view which shows the laminated glass explaining the Example of this invention. The drawing of the windshield explaining the Example of this invention. The top view which added the transparent board explaining the Example of this invention to FIG. The top view which added the synthetic resin film with a shade explaining the Example of this invention to FIG. The top view which added the transparent synthetic resin film explaining the Example of this invention to FIG. The top view which added the template explaining the Example of this invention to FIG. It is sectional drawing of FIG. 6, and is sectional drawing which added the knife explaining the Example of this invention. The top view of the synthetic resin transparent synthetic resin film | membrane with the cut | disconnected shade explaining the Example of this invention Sectional drawing of the synthetic resin film which shows the state which inserted the transparent synthetic resin film in the window opened in the synthetic resin film which has a colored region explaining the Example of this invention Sectional drawing of a synthetic resin film and hot air generator showing a state of blowing hot air, explaining an embodiment of the present invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Front glass 2 Drawing of front glass 3 Transparent board 4 Synthetic resin film with shade 5 Transparent synthetic resin film 6 Template 7 Knife 8 Synthetic resin film which has translucent part in coloring area 9 Hot air generator

Claims (8)

  In the synthetic resin film used for the laminated glass for the windshield of automobiles, which has a colored area that becomes a shade band on at least a part of the surface, a transparent part for monitoring the road condition with a camera is provided in the colored area. A synthetic resin film for laminated glass. A hole having substantially the same shape as the light-transmitting portion for monitoring is provided at a predetermined position of the colored region of the synthetic resin film in which the colored region is formed, and a transparent synthetic resin film having substantially the same shape as the hole is fitted therein, and the coloring is performed. The synthetic resin film for laminated glass according to claim 1, wherein a boundary portion between the synthetic resin film having a region and the transparent synthetic resin film is bonded. Production method.   3. The colored region according to claim 2, wherein a gap between a hole provided in the synthetic resin film having a colored region and a transparent synthetic resin film fitted in the hole is 1 mm or less. The manufacturing method of the synthetic resin film for laminated glasses which provided the translucent part.   The laminated glass according to claim 2, wherein the difference between the thickness of the peripheral portion of the hole provided in the synthetic resin film having a colored region and the thickness of the edge of the transparent synthetic resin film is 100 µm or less. For producing a synthetic resin film.   Adhesion between a synthetic resin film having a colored region and a transparent synthetic resin film allows the organic solvent to permeate the boundary portion of the synthetic resin film that abuts each other to dissolve the synthetic resin at the boundary portion, and then dry the organic solvent. The method for producing a synthetic resin film for laminated glass according to any one of claims 2 to 4, wherein the synthetic resin at the boundary portion is solidified by causing the resin to solidify.   Adhesion between a synthetic resin film having a colored area and a transparent synthetic resin film softens and adheres the synthetic resin at the boundary by heating the boundary, and then cools the synthetic resin by cooling the boundary The method for producing a synthetic resin film for laminated glass according to any one of claims 2 to 4, wherein the synthetic resin film is made by integrating the two.   The method for producing a synthetic resin film for laminated glass according to claim 6, wherein the boundary portion between the synthetic resin film having a colored region and the transparent synthetic resin film is heated by blowing hot air.   A laminated glass produced using the synthetic resin film for laminated glass according to claim 1.

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