JP4065280B2 - Method for cutting laminated glass and heating device for cutting - Google Patents

Description

  The present invention relates to cutting laminated glass. More particularly, the present invention relates to a method for easily sizing and cutting laminated glass sheets in the field, and a heating apparatus therefor.

Conventionally, laminated plate glass in which a resin layer is sandwiched between two plate glasses has been used for various purposes. Here, the laminated sheet glass has a problem that it is difficult to cut compared to the single sheet glass. As a conventional technique for cutting laminated glass, there is a glass cutting device described in Patent Documents 1 and 2. In the thing of patent document 1, a blade is driven with a piston or a spring, and a laminated sheet glass is cut | disconnected. In the thing of patent document 2, a laminated sheet glass is cut | disconnected by the local heating by a laser beam, and the rapid cooling by the subsequent coolant spraying.
JP 11-236235 A JP 2000-233936 A

  By the way, in recent years, laminated glass has come to be used for window glass in general households due to crime prevention requirements. When installing a flat glass window to a newly built property, it will be cut at the factory's dedicated equipment and assembled to the sash, and at the site, the sash will be attached to the target location. The same applies to the case where the sash is replaced with the existing house.

  However, if only the broken window glass is replaced in an existing house, the size of the glass may only be known on site. In such a case, after measuring at the site, it must be cut at the factory and then reattached at the site, or it must be cut at the site. When cutting the laminated glass at the site, there was the following problem when trying to use the above-described conventional glass cutting device. First, the glass cutting device of Patent Document 1 has problems in noise and dimensional accuracy. This is because cutting is performed by the reciprocating movement of the blade. The device of Patent Document 2 has a problem that it is difficult to bring it close to a general household. This is because a laser beam or a refrigerant jet is used. Others use flames, but have the same problem.

  The present invention has been made to solve the problems of the above-described conventional glass cutting apparatus. That is, an object of the present invention is to provide a method that can safely and easily cut a laminated sheet glass with high dimensional accuracy and a heating apparatus therefor.

  In the method for cutting laminated glass according to the present invention for solving this problem, a cut is made with a blade from both sides at the cutting position of the laminated glass, and one side of the laminated glass is parallel to the longitudinal direction of the linear heating apparatus. Place the cutting position with the cutout on the table on the heating device to support the laminated glass at an angle, heat the laminated glass with the heating device, and open the cutout of the laminated glass to expose the film layer. Cut the exposed film layer with a blade.

  In this cutting method, first, notches are cut with a blade on both sides of the cutting position of the laminated glass. At this point, the cut portion of the laminated glass is not heated and the film layer is not softened. Then, one side of the laminated sheet glass is placed on the table in parallel with the longitudinal direction of the heating device, and the cutting position with the cutout is placed on the heating device. Thereby, a laminated glass is supported diagonally. In this state, the laminated glass is heated with a heating device. What is actually heated is the cutting position and its vicinity. When the film layer is softened by heating, the part of the laminated glass that is floating from the table falls under its own weight. This exposes the softened film layer at the cutting position. For this reason, a film layer can be easily cut using a commonly used blade. Thus, it is possible to obtain a cut piece with good dimensional accuracy and a flat cut surface without using a flame or the like and without generating a loud noise.

  Here, it is desirable to use a heating instrument having a heating member and a holding member. The holding member is provided over the longitudinal direction of the heat generating member, the bottom is parallel to the longitudinal direction of the heat generating member, and the heat generating member is exposed and held on the opposite side of the bottom. Thereby, it can heat locally, supporting the cutting location of a laminated sheet glass with a heating instrument. The present invention is also directed to the heating device itself.

  In this heating tool for cutting, it is desirable that the heat generating member has a metal cylindrical member and a heating wire provided inside the cylindrical member. In this way, the temperature can be controlled appropriately by energizing the heating wire. Further, it is desirable that at least the surface of the heating member exposed from the holding member is covered with a protective layer. This is because the laminated glass is not damaged. It is desirable that the heat generating member is also held by the holding member via a heat-resistant flexible member. This is because the impact when the laminated glass sheet is placed on the heat generating member is alleviated.

  ADVANTAGE OF THE INVENTION According to this invention, the method which can cut | disconnect a laminated glass with a dimensional accuracy safely and simply at the field, and the heating instrument for it are provided.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the best mode for embodying the present invention will be described in detail with reference to the accompanying drawings. First, a heating apparatus for cutting plate glass used in this embodiment will be described. As shown in the plan view of FIG. 1 and the front view of FIG. 2, the heating device for cutting laminated glass sheets according to the present embodiment is configured in a long shape.

  The cutting heater 1 includes a stainless pipe 10 and a holding member 11 that holds the stainless pipe 10. The stainless steel pipe 10 has an outer diameter of about 12 mm. About half of the stainless steel pipe 10 is exposed from the holding member 11. As shown in the sectional view of FIG. 3, a nichrome wire 12 is spirally wound around the inner surface of the stainless steel pipe 10. The stainless steel pipe 10 and the nichrome wire 12 constitute a heat generating member. The nichrome wire 12 can be energized through the terminals 13 and 14 at both ends of the stainless steel pipe 10. Insulator caps 18 are actually attached to both ends of the stainless steel pipe 10 as shown in FIG. This is to prevent electric shock and burns.

  The holding member 11 is made of wood. The bottom surface 17 of the holding member 11 is a plane parallel to the stainless steel pipe 10. Further, a flexible heat-resistant silicone resin cushioning material 15 is sandwiched between the stainless steel pipe 10 and the holding member 11. A heat-resistant tape 16 is attached as a protective material to a portion of the outer surface of the stainless steel pipe 10 exposed from the holding member 11.

  What is to be cut in this embodiment is a laminated plate glass in which two plate glasses are stacked with a PVB (polyvinyl butyral) resin film layer interposed therebetween. The cutting method in this embodiment will be described with reference to the plan view of FIG. 5 and the front view of FIG. First, it measures at the spot and marks the cutting position of the laminated glass 20 to be cut. Then, cut out both sides at the marked position. The work of notching may be performed with a commonly used manual cutter such as a glass cutter.

  In other words, a notch is first cut with a blade on one side. At this point, only a cut-out flaw has entered near the surface of the glass sheet on one side, and the cut-out flaw has not reached the film layer. In this state, the laminated glass sheet 20 is slightly curved so that the notched surface is on the outside. Then, the notch flaw progresses and the outer plate glass is completely divided into two. This work can be easily performed by an experienced sheet glass handling operator by using an aluminum ruler for marking. As a result, a so-called new is entered on one side of the laminated glass sheet 20. However, the gap is very small and it is not possible to insert a knife or the like until it reaches the film layer. Make a notch on the other side in the same way.

  Further, the cutting heater 1 is placed on the table so that the stainless steel pipe 10 faces upward. Then, since the bottom surface 17 of the holding member 11 is a flat surface, the stainless steel pipe 10 is parallel to the base surface 21. Then, the laminated glass plate 20 with the cutout is placed on a table so as to stand against the cutting heating device 1. That is, one side 20 a of the laminated glass sheet 20 is placed on a table in parallel with the cutting heater 1, and one surface of the laminated glass sheet 20 is leaned against the cutting heater 1. Then, the laminated glass sheet 20 is in a state of being supported obliquely by the base surface 21 and the cutting heater 1. That is, one side 20 a is in contact with the base surface 21, and the opposite side 20 b of the one side 20 a is in a state of floating from the base surface 21. For this reason, the position between the one side 20a and the opposite side 20b is supported by the stainless steel pipe 10 of the cutting heater 1. 5 and 6 show this state.

  At this time, the position of the cutout in the laminated glass sheet 20 is set to be directly above the heating tool 1 for cutting. This is indicated by the characters “notch position” in FIG. Therefore, the size of the laminated glass 20 corresponding to A or B in FIG. 5 is the size of the target glass piece. Here, there is almost no impact when the laminated glass 20 and the cutting heater 1 come into contact with each other. This is because the shock is absorbed by the buffer material 15. Further, the surface of the laminated glass 20 is not damaged. This is because the heat-resistant tape 16 reduces the hit.

  In this state, the laminated glass 20 is heated by the heating tool 1 for cutting. Here, if the nichrome wire 12 of the heating tool for cutting 1 is energized and the stainless steel pipe 10 is preheated from the time of the above-described notch operation, the working efficiency is good. Actually, only the vicinity of the portion directly above the cutting heater 1 in the laminated glass sheet 20 is locally heated. The target temperature is a temperature at which the film layer of the laminated glass 20 is softened. Specifically, if the thickness of the film layer is 1.524 mm (60 mil), the temperature of the stainless steel pipe 10 is about 150 ° C., and if the thickness is 2.286 mm (90 mil), the temperature of the stainless steel pipe 10 is 180 ° C. Degree. If it is this temperature, the buffer material 15 can fully endure. Further, since the buffer material 15 is a silicon resin having a low thermal conductivity, the holding member 11 is substantially thermally insulated from the stainless steel pipe 10. For this reason, the temperature of the holding member 11 does not increase so much.

  When the film layer of the laminated glass sheet 20 is softened by heating, as shown in FIG. 7, the cut piece 20A corresponding to the portion A in FIG. 5 naturally falls due to its own weight. As a result, the notch is opened and the film layer 22 is exposed as shown in FIG. At this time, the exposed portion of the film layer 22 is slightly pulled and stretched. As a result, a gap is formed between the two cut pieces so that the blade can be inserted. Therefore, the exposed film layer 22 is cut with a cutter such as a cutter knife. Since the exposed film layer 22 is softened, it can be easily cut with a blade. Thereby, the laminated glass 20 is cut | disconnected by two cut pieces of the cut piece 20A and the cut piece 20B. Thus, the laminated glass sheet 20 is cut. FIG. 8 is a slightly exaggerated illustration of the notch opening.

  The cut surfaces of the two cut pieces 20A and 20B of the laminated glass 20 thus obtained are clean and flat. For this reason, the cut piece of the size as aimed is obtained. Therefore, the cut piece of the laminated sheet glass cut by the cutting method of the present embodiment can be fitted into a window sash or the like with good dimensional accuracy. Either the A side or the B side in FIG. 5 may be matched to the size of the target location. Here, the cutting method of the present embodiment can be carried out without any problem even in the immediate vicinity of a general residential house. This is because no flame, laser beam, or refrigerant jet is used. In addition, there is no noise greater than that in the case of normal sheet glass cutting work. Therefore, by using the cutting method of the present embodiment, it is possible to easily repair a portion where the window glass is broken in a general home with a laminated glass sheet at a single site visit.

  The cutting method of this embodiment may not work if the dimension A in FIG. 5 is too small. However, although it depends on the dimension of W in FIG. 5 and the thickness of the laminated glass plate 20, it can be carried out if it is approximately 30 mm or more. Further, during heating, a load may be applied to the positions indicated by arrows F and G in FIG. At that time, it is preferable to apply the load as uniformly as possible in the direction parallel to the notch direction. Therefore, as the weight, for example, a long one such as an aluminum ruler for marking may be used.

  Note that this embodiment is merely an example, and does not limit the present invention. Therefore, the present invention can naturally be improved and modified in various ways without departing from the gist thereof.

  For example, in the cutting heater 1, the material of the holding member 11 is not limited to wood. Any material can be used as long as it has the required strength. The shape of the bottom portion of the holding member 11 is not limited to a flat surface, and may be a shape in which protruding feet are arranged at four corners, for example. The buffer material 15 is not limited to silicon resin. Any material with the necessary flexibility and heat resistance may be used. When the holding member 11 is made of a heat-resistant material, the heat insulating property of the cushioning material 15 is not particularly necessary. Other types of metal pipes may be used in place of the stainless steel pipe 10. Also, the shape is not necessarily a pipe. Furthermore, the heat-resistant tape 16 may be replaced with a glass cloth or the like, and is not necessarily essential. Further, instead of the nichrome wire, another heating wire or an infrared heating type heating member may be used. Further, a thermostat or the like may be provided to automatically prevent overheating.

It is a top view of the heating instrument for the cutting | disconnection of the plate glass which concerns on embodiment. It is a front view of the heating instrument for cutting | disconnecting the plate glass which concerns on embodiment. It is sectional drawing of the heating apparatus for the cutting | disconnection of the plate glass which concerns on embodiment. It is a perspective view which shows the edge part of the heating instrument for the cutting | disconnection of the plate glass which concerns on embodiment. It is a top view which shows the cutting method of the plate glass which concerns on embodiment. It is a front view which shows the cutting method of the plate glass which concerns on embodiment. It is a front view (after temperature rising) which shows the cutting method of the plate glass which concerns on embodiment. It is a figure which expands and shows a part of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cutting heater 10 Stainless steel pipe 11 Holding member 12 Nichrome wire 15 Buffer material 16 Heat resistant tape

Claims (4)

In the method of cutting laminated glass,
Cut the laminated plate glass at the cutting position with a knife from both sides,
Place one side of the laminated glass on a table parallel to the longitudinal direction of the linear heating appliance and place the cut position with a notch on the heating appliance to support the laminated glass obliquely;
Heating the laminated glass sheet with the heating device;
When the cutout of the laminated glass sheet is opened and the film layer is exposed, the exposed film layer is cut with a blade. In the cutting method of the laminated sheet glass of Claim 1, As said heating instrument,
A heating member;
It is provided over the longitudinal direction of the heat generating member, and the bottom portion is parallel to the longitudinal direction of the heat generating member, and has a holding member that exposes and holds the heat generating member on the opposite side of the bottom portion. How to cut laminated glass. A linear heating member;
A laminated plate glass comprising a holding member provided over the longitudinal direction of the heat generating member, having a bottom portion parallel to the longitudinal direction of the heat generating member, and exposing and holding the heat generating member on the opposite side of the bottom portion. Heating equipment for cutting. The heating device for cutting laminated glass according to claim 3, wherein the heating member is:
A metal cylindrical member;
A heating wire provided inside the cylindrical member;
And a protective layer provided on the surface of at least a portion exposed from the holding member, and held by the holding member via a heat-resistant flexible member. Instruments.

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