JP2834853B2 - Manufacturing method of see-through plate - Google Patents

Description

The present invention relates to a method for manufacturing a see-through plate provided with an energizable heat ray reflective film having a heat ray reflection function and used for a door or a window of a low-temperature showcase. .

(B) Prior art Japanese Utility Model Publication No. 60-38860 discloses a transparent plate provided with a heat ray reflective film made of a conductive metal on the back side and having a vapor deposited layer having excellent visible light transmittance and heat ray reflectance. Become
Further, there is disclosed a see-through plate in which a plurality of slits are provided in the vapor deposition layer at an interval from each other to divide the heat ray reflective film into a plurality of strip portions, and the vapor deposition layer is an electric heating element.

(C) Problems to be Solved by the Invention In the above-mentioned conventional technique, the heat ray reflective film is divided into a plurality of elongated strips by slits formed by a cutting operation using a cutter or the like. Due to the thinness, the cut end faces of the strips come into contact with each other and sparks occur, causing electrical leakage. The slits lengthen the current path of the heat ray reflective film, and the purpose of providing resistance and making it transformerless can not be achieved. Occurred.

An object of the present invention is to solve such a problem, and the width of the slit is increased after the slit is formed.

(D) Means for Solving the Problems As a means for solving the above problems, the present invention provides a transparent plate and an excellent selection of a visible light transmittance and a heat ray reflectance made of a conductive metal on one surface of the transparent plate. The heat ray reflective film provided with the transmission / reflection layer is adhered in an elongated state, and the heat ray reflective film is adhered, and cut in an extended state to form a slit, thereby forming the heat ray reflective film. The heat ray reflective film is provided over the entire width of the short side and serves as a current input / output end. The heat-reflection film is provided with a plurality of long sides facing each other and a short side adjacent to the long side. Forming two short conductive bands and at least one long conductive band provided over the entire width of the adjacent short side of the heat ray reflective film and provided over each of the short sides, and adjacent to each other. The heat ray reflection A method for manufacturing a see-through plate in which films are electrically connected to each other in series via the long conductive band.

(E) Operation According to the above-mentioned means, the cut strips are formed in the respective central directions along with the slits formed by cutting the heat ray reflective film stretched and adhered to the transparent plate. It acts to contract and widen the slit to form an electrical insulation gap.

(F) Example Hereinafter, an example of the present invention will be described in detail with reference to the drawings.

(1) shown in FIGS. 3 and 4 is a door (3) on the front surface.
(3) A storage room such as a refrigerated showcase having a main body composed of an insulating wall (2) having an opening for taking in and out of goods, which is openably and closably closed by (3). 2A), a plurality of shelves (2B) are arranged, and a partition plate (4) is arranged along the back wall to provide a cooler passage (5) for installing a cooler (E) and a blower (F). A compressor (P), a condenser (C), etc., which constitute a refrigeration cycle together with the cooler, are installed in a machine room (B) formed at the lower part of the main body, and heat is exchanged by the cooler. The inside of the refrigerator (2A) is cooled by forcibly circulating cool air by a blower (F) as shown by an arrow in FIG.

As shown in FIGS. 1 and 2, the doors (3) and (3) comprise a see-through plate (6) and a frame member (7) provided on the periphery of the see-through plate. ) Is a spacer (3A) and two transparent plates (6A) and (6B) on the outside and inside made of a composite transparent glass or a synthetic resin, etc., which are provided at intervals by the spacer. Affixed to the inside surface of the transparent plate (6A), the long sides (11A) (12A) (13
A) Separate each other electrically insulated from each other so that there is no electrical leakage.
Three rows of strips (11), (12) and (13) composed of a heat ray reflective film (10) provided with (9) and both short sides of these strips (11), (12) and (13) (11B) (12B) (13
B) and conductive bands (16) to (19), which are elongated electrodes provided over the transparent plate (6A). As shown in FIG. 5, the heat ray reflective film (10) is made of a base layer (21) made of polyester or the like having a heat resistant temperature of 100 to 120 ° C.
A deposition layer, ie, a selective transmission / reflection layer (22), made of a metal and / or a metal oxide such as silver and / or titanium oxide or aluminum, and deposited on one surface of the base layer (21); (23) is formed by sequentially laminating and polymerizing and has a moisture-proof and selective transmission / reflection function, transmits visible light and reflects infrared light, and is transparent with a transparent acrylic paste layer (24). Affixed to the back of the board (6A).

As a method of attaching the heat ray reflective film (10), there are a mechanical tension method and a hand tension method using a liquid such as water. First, in the case of the mechanical tension system, the laminator (50) shown in FIGS. 10 and 11 is used. This laminator consists of a number of rollers (51) (51) (51) that carry a transparent plate (6A)
Then, the first and second drive rollers (52) and (53) disposed between the rollers and the heat ray reflection film (10) wound in a roll with the release paper (54) attached thereto are drawn out. A pressing drive roller (55) for pressing the drawn heat ray reflective film (10) onto the transparent plate (6A), a winding roller (56) for winding the release paper (54), and a tension roller (5).
7)

The pressing drive roller (55) is provided with an elastic member made of soft rubber or plastic around it, and is controlled to have a lower rotation speed than the first drive roller (52). The heat ray reflective film (10) from which the release paper (54) has been peeled off is stretched on the transparent plate (6A), that is, adhered in a state where a predetermined tension is applied. That is, the speed of the heat ray reflection film (10) drawn out by the pressing drive roller (55) is lower than the speed of the transparent plate (6A) carried by the first drive roller (52), and the time lag with respect to the transparent plate (6A) is reduced. The heat ray reflective film (10) is continuously attached to each transparent plate (6A) in a stretched state to wake up, and after application, cut at the intervals formed between each transparent plate (6A) Then, as shown in FIG. 12, the periphery of the transparent plate (6A) is trimmed so that the surface of the transparent plate (6A) is exposed in a rectangular tube shape.

The bordered heat ray reflective film (10) is stretched as shown by the arrow in FIG. 12, and in this state, the position shown by the chain line is cut by the cutter knife (58) as shown in FIG. By doing so, it is divided into 3
2) (13) is formed, and slits (8) and (9) are formed between the strip-shaped portions. The slit (8)
The strips (11), (12), and (13) are gradually shrunk toward their respective centers in a state of being adhered to the transparent plate (6A) with the formation of (9), so that the slits (8) ( The width of 9) is slightly widened, and the cut surfaces of the strips (11), (12), and (13) are separated from each other as shown in FIG.

As shown in FIG. 18, if the cutter knife (58) is a two-blade cutter, ie, a double cutter,
As shown in FIG. 17, the width of the slits (8) and (9) can be made large in advance.

Next, the tensioning method will be described. As shown in FIG. 15, water is sprayed on the transparent plate (6A) with a spray (59) to wet the surface of the transparent plate (6A). 6A)
The adhesive layer (24) of the heat ray reflective film (10) having an area smaller than that of the surface of (1) is adhered. Then, as shown in Fig. 16, a spatula (6
0) Then, the heat ray reflective film (10) is pressed against the transparent plate (6A) and stretched from the center outward, and the drainage work between the transparent plate (6A) and the heat ray reflective film (10) is performed. Perform so that no air bubbles remain between the transparent plate (6A) and the heat ray reflective film (10).

As shown in FIGS. 13 and 14, two slits (8) and (9) are formed with the cutting of the cutter knife (58) as shown in FIGS. And divided into three parts (11, 12)
(13) is formed. In the siding method using water, the slits (8) and (9) serve to promote evaporation of residual moisture between the transparent plate (6A) and the heat ray reflective film (10).

(61) shown in FIG. 19 is the respective band-shaped portions (11) (12)
(13) The edge of the long side (11A) (12A) (13A) and the transparent plate (6
A) and the slits (8) and (9)
1) (12) (13) Adhesive electrically insulated transparent sealing members provided on the adjacent edges of the long sides, each band-shaped portion (11)
(12) In addition to improving the adhesive strength at the edges of (13), the adhesive layer (24) is prevented from deteriorating due to moisture permeability.

The conductive bands (16) to (19) are made of an alloy of silver and another metal having a width of 8 mm and an electric resistance of 0.018 Ω / cm, for example,
The conductive band (16) is provided on one short side (11B) of the coating (11) over the entire width, and a lead wire (26) is connected to an appropriate position by soldering or the like. A variable resistor (41) for adjusting the applied voltage is connected between the variable resistor (not shown). The conductive band (17) is provided so as to straddle the other short side (11B) of the left band-shaped portion (11) and one short side (12B) of the center band-shaped portion (12). The conductive strip (18) is connected to the other short side (12B) of the central strip (12) and one short side (1) of the right strip (13).
3B). In addition, conductive band (1
9) is provided over the entire width of the other short side (13B) of the right band-shaped portion (13), and a lead wire (27) is connected to an appropriate position by soldering or the like. These conductive bands (16)
Each band-like part (11) (12) (13) accompanying the arrangement of (19)
Are electrically connected in series via the conductive bands (16) to (19), have a long current path, have a predetermined resistance, and do not require a transformer.

Further, in connecting the lead wire (26), a connecting portion (16A) extending outward is preferably formed at an appropriate position of the conductive band (16) as shown in FIG. By preventing the influence of the heat by the electric iron upon the soldering from affecting the band-shaped portion (11), it is possible to prevent the peripheral edge of the band-shaped part from being melted or damaged by the electric iron. The conductive band (19) may be formed similarly to the conductive band (16) in FIG. FIG. 7 shows a preferred embodiment of the conductive band (17).
1) An outwardly extending projection (17A) is formed at a boundary between (12), that is, at a portion corresponding to the slit (8), and the projection is formed from one end of the conductive band (17). The area around the center of the conductive band (17) for the current to flow to the other end is large,
The current flows more easily and the current flow between the respective strips is better.

In addition, as shown in FIG.
2) Provide a remaining part (11C) at the lower end of the slit (8) between
The conductive band (17) completely covers the lower ends of the strip-shaped portions (11) and (12) and the remaining portion (11C), so that the conductive strip (17) can cover the strip-shaped portions (11), (12) and the remaining portion (11A). Adhesion can be made uniform and the same operation and effect as in the above embodiment can be obtained. Of course, the upper end between the band portions (12) and (13) may have the same configuration.

Furthermore, the conductive strips (16), (17), (18), and (19) are printed on the strips (11), (12), and (13) only in a slender manner by silk printing, so that the heat ray reflection film (10 ) Has no thermal effect, which is preferable.

Further, as shown in FIG. 9, each conductive band (16) (17) (1
8) By covering (19) with a coating (62) such as a carbon paint, oxidation of silver, which is a main component of each conductive band, can be prevented, and abnormal conduction due to oxidation can be avoided.

The commercial voltage (AC10) is connected between the above lead wires (26) and (27).
The state of the transparent plate (6A) when 0V) is applied will be described. The dimensions of the strips (11), (12), and (13) made of the heat ray reflective film (10) that can be energized are, for example, about 17 short sides.
0 mm, the long side is about 1340 mm, the distance between the upper and lower conductive bands is about 1330 mm, and the width of the conductive bands (16) to (19) is about 8 mm. The area specific resistance of each of the strips (11), (12) and (13) is approximately 8 to 11Ω, and the resistance of each of the strips is (A: length of resistor, b: width of resistor, d: area specific resistance) a = 13
Substituting 30, b = 170, d = 10 Here, when the commercial voltage is applied as described above, the electric current is applied to the conductor (16), the band-shaped portion (11), the conductive band (17), the band-shaped portion (12), the conductive band (18), and the band-shaped portion ( 13) and the conduction band (19). And each strip-shaped part (11) (12)
The heating value of (13) is approximately 43W in total, and the internal temperature 2
℃, outside temperature of 30 ℃, the temperature of each strip is approximately 27 ℃,
The surface temperature of the transparent plate (6A) is approximately 26 ° C. The conductive strips (16) to (19) are respectively strip-shaped portions (11), (12), and (13).
Are provided over the entire width of the short sides (11B), (12B), and (13B), and the conductive strips (17) and (18) are provided between the strips (11) and (12) and the strips (12) and (13), respectively. Because it straddles between the strips (11) and (12) and between the strips (1
Between 2) and (13), the current flows through the conductive bands (17) and (18), and from the opposing conductive bands (16) to (19), the respective band-shaped portions (11), (12) and (13) The current flows linearly over the entire width, and flows uniformly through each of the strips (11), (12), and (13).

Therefore, the strip (11) provided on the transparent plate (6A)
(12) and (13) transmit visible light and reflect infrared light, and in addition to avoiding the rise in the internal temperature due to the infrared light, reflect the infrared light to the outside of the refrigerator to reduce the surface temperature of the transparent plate (6A). Can be raised, in addition to
Each of the strips (11) (12) (13) is a conductive strip (17) (1
8) electrically connected in series, so that the conductive band (16) can be connected to the conductive band (19) via each of the strips (11), (12) and (13) and the conductive bands (17) and (18). The current value when voltage is applied is reduced by increasing the resistance value, and the current flows almost linearly over the entire width of each strip (11), (12), (13). The shortage can be compensated for by the heat-generating action of the heat ray reflective film itself, the amount of heating required for dew prevention can be obtained, and dew condensation on the transparent plate (6A) can be eliminated, thereby improving the see-through effect. In addition, as shown in FIG.
6) By providing a variable resistor (41), each belt-shaped part (11) (12) (13) adapted to the temperature and humidity conditions inside and outside the refrigerator
The amount of heat generated can be changed.

The conductor (16) extends over the entire width of the upper short side (11B) of the strip (11), and the lower short side (11B) of the strip (11).
And the entire width of the conductor (17), the upper short side (12B) of the strip-shaped part (12) and the entire width of the short upper end (13B) of the strip-shaped part (13). The conductor (19) is provided over the entire width of the conductor (18) and the lower end short side (13B) of the strip-shaped portion (13).
With the above configuration, the current flows from the conductor (16) to the strip (1).
1), conductor (17), strip (12), conductor (18),
It flows in the order of the strip portion (13) and the conductor (19), and a part of each strip portion (11) (12) (13), for example, a slit (8)
The current can be prevented from being concentrated on the conductive belt (17) (18) side end and the like of (9), and the current flows uniformly in each of the strips (11), (12) and (13), Heat can be generated uniformly.

Further, in the above embodiment, three strip-shaped portions (11)
(12) Although the transparent plate (6A) to which (13) is adhered has been described, for example, when the transparent plate (6A) is used for a door of a low-temperature showcase of, for example, −20 ° C., which is considered to have a lower internal temperature, By using two strips wider in width than the strips (11), (12) and (13) and connecting them in series, the combined resistance becomes smaller than in the case of three strips, and the commercial resistance when applying commercial voltage is reduced. The calorific value can be increased. On the other hand, when the transparent plate (6A) is used for a door of a low-temperature showcase of, for example, 8 ° C., which is assumed to have a high internal temperature, the band-shaped portion (1A) is used.
1) By connecting each of them in series using, for example, four strips having a smaller width than (12) and (13), the combined resistance becomes larger than in the case of three strips, and the heat generated when a commercial voltage is applied is generated. The amount can be reduced.

(G) Effect of the Invention According to the present invention, each of the divided strip-shaped portions shrinks in the direction of the respective center, as the slits are formed in the heat ray reflective film stretched and adhered to the transparent plate. To widen the slits and form an electrical insulation gap,
The cut end faces of each band-shaped portion do not come in contact with each other, and a plurality of band-shaped heat ray reflection films can be easily formed on a transparent plate, and after forming a plurality of heat ray reflection films on a transparent plate, a plurality of heat ray reflection films are formed. In order to electrically connect the heat ray reflective films of the above, a conductive band is formed on the heat ray reflective film, so that the conductive band of the see-through plate can be easily formed. Has the effect of being easily manufactured.

[Brief description of the drawings]

Each of the drawings shows an embodiment of the see-through plate of the present invention, FIG. 1 is a vertical front view of a door used in a low-temperature showcase, FIG. 2 is a vertical side view of the door, and FIG. , FIG. 4 is a longitudinal sectional side view of the showcase, FIG. 5 is a cross-sectional view of a main part of the door, FIG. 6 is an enlarged view of a connecting portion between a lead wire and a conductive band, FIG. 7 and FIG. Fig. 9 is an enlarged view of a main part of a conductive band spread over adjacent belt-shaped parts, Fig. 9 is a side view of a main part having a conductive band formed only on a heat ray reflective film, and Figs. 10 and 11 are heat rays to a transparent plate. FIG. 12 is a schematic perspective view of a laminator showing attachment of a reflective film, and FIG. 12 is a perspective view of a see-through plate to which a heat ray reflective film is attached, and FIG. 13 is a longitudinal section of a transparent plate immediately after cutting the heat ray reflective film. FIG. 14, FIG. 14 is a longitudinal sectional view of the transparent plate after several hours after cutting the heat ray reflective film, and FIG. Perspective view of a spray spraying process, FIG. 16 is a perspective view showing a draining step in the hand-clad type, FIG. 17 is a perspective view showing a slit forming step by double cutter, FIG. 18 is a perspective view of a double cutter, 19
The figure is a longitudinal sectional view of a see-through plate using a sealing member. (6A) ... Transparent plate, (8) (9) ... Slit, (10)
... heat ray reflection film, (11) (12) (13) ... band-like portion, (16) to (19) ... conductive band (electrode), (22) ... selective transmission reflection layer.

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F25D 21/04 F25D 23/02

Claims (1)

(57) [Claims] 1. A stretched state of a transparent plate and a heat ray reflective film provided on one surface of the transparent plate and comprising a selective transmission / reflection layer having excellent visible light transmittance and heat ray reflectance made of a conductive metal. Then, the heat ray reflective film, affixed, and cut in a stretched state to form a slit, the heat ray reflective film a plurality of opposed long sides and short sides adjacent to these long sides After that, the heat ray reflective film is provided with two short conductive bands provided over the entire width of the short side and serving as current input / output terminals, and a short side of the adjacent heat ray reflective film. Forming at least one long conductive band provided over the entire width and straddling each short side, and electrically connecting the adjacent heat ray reflective films to each other via the long conductive band. Connected in series Method for producing a transparent plate, wherein.