JPS6217536B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Field of Industrial Application The present invention relates to a transparent plate with a heat-reflecting film used for doors and windows of refrigerators, low-temperature display cases, and the like.

(b) Prior art 1 shown in Fig. 1 is a low-temperature case whose main body is made up of an insulating box 2, with a top wall 3 on the rear half of the top surface and a door storage section below it, and a pair of left and right panels on the front half of the top surface. A transparent door 5 is provided with both edges supported by rails 4 and slidable in the front and back direction to freely open and close the opening for storing and taking out products.
Equipped with the necessary cooling equipment to cool the

As shown in FIG. 2, the transparent door is mainly composed of a transparent plate 7 made of glass or the like, which has a top wall 7B with a curved corner 7A formed in a part thereof, and a front wall 7C that slopes downward toward the front. Then, the left and right frames 9A, 9B equipped with a pair of front and rear rollers 8A, 8B guided by the rails are fitted along the left and right sides, and the front frame 10 equipped with an opening/closing handle 10A is fitted along the front edge. Furthermore, a heat ray reflective film 11 is attached to the back surface of the transparent plate 7, as shown in FIG. As shown in Figure 4, this film has a base layer 11A made of a transparent polyester sheet, etc., and is vapor-deposited on the inner side of this base layer, transmitting most of visible light and reflecting most of heat rays (infrared rays). , a reflective layer 11B mainly composed of silver or titanium oxide that blocks most of the ultraviolet rays, a transparent protective layer 11C that protects this reflective layer from moisture in the refrigerator interior 6, and a surface of the base layer on the outside of the refrigerator. It has a selective transmission/reflection function consisting of a glue layer 11D made of transparent acrylic glue, etc., and reflects most of the heat rays that try to pass through the transparent plate 7 toward the outside of the refrigerator, thereby freezing the interior 6 of the refrigerator. It is used for the purpose of preventing an increase in load and maintaining the surface temperature of the transparent plate 7 at a temperature higher than the dew point to prevent dew condensation on the surface.

This heat ray reflective film is generally sold in a roll wrapped around a core material, and when pasting it on a flat transparent plate, the roll film is stretched using an automatic stretching device. An automatic pasting method is used in which the cut to a predetermined width is pasted on a transparent plate carried by a conveyor, but the above-mentioned curved corner 7A
The use of this method for attaching the transparent plate 7 to the transparent plate 7 not only causes wrinkles in the film, which deteriorates the heat ray reflection function, but also has the fatal disadvantage of impairing the see-through effect.

Therefore, the inventor of the present application sprayed water on the back surface of the transparent plate 7 using a spray method to make the back surface wet, and then applied a heat ray reflective film 11 having an area slightly smaller than the area of the back surface to the peripheral end surface of the back surface. A spatula whose pressing part is made of a slightly elastic material such as rubber is pressed from above the film and moved from the center of the film in each direction shown by the arrows in FIG. While stretching, remove the water between the film 11 and the transparent plate 7,
A method of attaching the glue layer 11D to the transparent plate 7 was tried.

In such a pasting method, since the area of the film 11 is made smaller than the area of the back surface of the transparent plate 7, it is possible to effectively drain water from flat parts such as the top wall 7B and front wall 7C, and also to remove water from the flat parts. There are advantages such as no peeling of the peripheral edges of the opposing films 11, and the exposed part of the back surface and the peripheral edges of the film can be sealed with an oil-based varnish such as Polyurex (trade name) after draining. What was done was that the extension work was done with a spatula at corner 7A shown in Figures 3 and 4.
A disadvantage is that peeling parts 12 are often formed at both ends of the film 11 facing the transparent plate 7, and at the same time gaps 13 are also formed between the film 11 and the transparent plate 7. As shown by the chain line, there was also a defect that a blister 14 remained at the corner 7A.

(c) Object of the invention The object of the present invention is to improve the commercial value of transparent plates by solving the drawbacks of the prior art.

(d) Structure of the invention A transparent plate having a curved corner, an adhesive layer on the surface that is smaller in area than the opposing surface of the transparent plate and facing the transparent plate, and a glue layer at the corner of the transparent plate. A substantially transparent heat-reflecting film having an appropriate number of inward notches formed at opposing ends is prepared, and after one side of the transparent plate is wetted with water, the peripheral edge of this side is exposed. A heat ray reflective film is layered on top of the other, and this film is stretched from above to remove water between the transparent plate and the film, and an adhesive layer is attached to the transparent plate to create a transparent plate. How to attach the film.

(e) Embodiment FIG. 5 shows an embodiment of the present invention, and in FIG. 5, the same reference numerals as in FIGS. 1 to 4 are the same.

Reference numerals 15A and 15B denote an appropriate number of notches formed in advance on both ends of the heat ray reflective film 11 facing the corner 7A of the transparent plate 7, and an appropriate number of tongue pieces 16A and 16B are formed along with these incisions. The number and length of these cuts vary depending on the degree of curvature of the corner 7A, and if there is only one cut, no tongue piece is formed. Also, 17 is both notches 15A, 15
An appropriate number of slits are formed in advance on the film 11 so as to be located between the corners B and along the longitudinal direction of the corner 7A.

Such a heat ray reflective film 11 is attached to the transparent plate 7 by the attaching method shown in FIG. Also, the water at both ends of the corner 7A is removed from the notches 15A, 15B, and the notches 15A, 15B widen outward as shown in FIG. 6, and the tongues 16A, 16B are pasted near both ends of the corner 7A. It will be worn.

Therefore, the stretching operation of both ends of the heat ray reflective film 11 facing the curved corner 7A of the transparent plate 7 can be reliably performed by widening the cuts 15A and 15B, and water can be drained well at both ends.

(F) Effects By widening the cut, the wrinkles caused by the stretching of both ends of the heat ray reflective film facing the curved corner of the transparent plate are eliminated, and the water between the corner and both ends of the film is improved. Therefore, both ends of the film can be adhered well, and the commercial value of the transparent plate can be improved.

[Brief explanation of the drawing]

Figure 1 is a perspective view of a low-temperature show case equipped with a transparent plate with curved corners as a door, Figure 2 is a perspective view of the door shown in Figure 1, and Figure 3 is a perspective view of the door used in Figure 2. A perspective view showing the back side of a transparent plate and showing a method of attaching a heat ray reflective film, FIG. 4 is an enlarged view of the main part of FIG. 3A seen from the side, and FIG. 5 shows an embodiment of the present invention. A perspective view opposite to FIG.
FIG. 6 is an enlarged view of FIG. 5B. 7... Transparent plate, 7A... Corner, 11... Heat ray reflective film, 11D... Glue layer, 15A, 15B... Notch.

Claims (1)

[Claims] 1. A transparent plate having a curved corner, an adhesive layer on the surface that is smaller in area than the facing surface of the transparent plate, and facing the transparent plate, and a glue layer on both ends facing the corners of the transparent plate. Prepare a substantially transparent heat-reflecting film having an appropriate number of inward notches, wet one side of the transparent plate with water, and then overlay the heat-reflecting film so that the peripheral edge of this side is exposed. At the same time, the film is stretched from above to remove water between the transparent plate and the film, and an adhesive layer is attached to the transparent plate.