JP2020186903A - Internal transmission member - Google Patents

Abstract

To provide an internal transmission member consists of a hollow double structure which is formed into a hollow structure by using a transmission member so as to realize reduction in weight and, further, extremely facilitates dealing upon manufacturing and opening/closing of door, in such a structure as to spatially separate a region having a temperature difference between an external part and an internal part such as a refrigerating showcase and to have the inside visually recognizable, and to provide a cooling storage using the internal transmission member.SOLUTION: An internal transmission member 18 is manufactured by using a hollow double structure 28 made of thermoplastic resin which has total light transmittance of 88% or more and haze value of 1% or less, and a region having a temperature difference is spatially separated so that an internal part of the region can be transmitted and visualized.SELECTED DRAWING: Figure 1

Description

The present invention relates to an internal transmissive member, and more specifically, a transparent hollow double structure that separates a region having a temperature difference between the outside and the inside, such as a refrigerated showcase, with labor and cost in manufacturing. It relates to an internal transmissive member which can significantly reduce.

As equipment that stores stored items such as food in a cooled / frozen state and makes the stored items visible to customers and employees from the outside, for example, a cooled storage such as the refrigerated showcase shown in FIG. 10 and the material case 12 of the sushi restaurant shown in FIG. 11 are widely used. In these article storage facilities, an evaporator of the refrigerant derived from the built-in freezer is placed inside the refrigerator to cool and freeze the inside to an appropriate temperature, and glass is used as a member to separate the outside from the inside. A door 14 and a front glass plate 16 are used. In this case, a material having particularly excellent light transmission is selected for the glass so that customers and employees can visually recognize the type and state of the stored items from the outside.

However, in a cooling storage facility such as a refrigerated showcase where the inside is visually recognizable and the inside is maintained at a temperature lower than the outside air temperature, dew condensation occurs on the inner surface of the glass due to the temperature difference between the inside and the outside and becomes cloudy. , The visibility from the outside is significantly impaired. Therefore, a specification in which the glass door 14 and the front glass plate 16 are made of double glazing to prevent the occurrence of dew condensation due to a temperature difference has become widespread. In this double-glazed glass, two glass plates are arranged facing each other with a slight gap interposed therebetween, and a closed space is created inside by surrounding the entire circumference with a spacer to improve heat insulation. That is, even if the inside of the refrigerated showcase or the like is cooled below the outside air temperature, the internal transmission of the outside air temperature is blocked (insulated) by the space of the double glass, so that dew condensation is unlikely to occur on the internal glass surface and good visibility is achieved. Sex is ensured.

JP-A-2017-77985 Special Table 2016-531063

As described above, when double-glazed glass is used for a cooling storage such as a refrigerated showcase or a sushi material case, the glass surface is less likely to be fogged, so that visibility is not impaired. However, double-glazed glass has a drawback that it is difficult to handle because the total weight becomes large because two heavy glass plates are used and the hinge supporting the glass door becomes large. In addition, double glazing is standardized according to various door dimensions for the use of housing building materials, so efficient mass production is carried out on the manufacturer side. On the other hand, double glazing used for refrigerated showcases and the like needs to be individually manufactured according to various dimensions of various products, which requires labor and time at the manufacturing site, resulting in high cost.

Further, dust may enter between two glass plates facing each other during the production of double-glazed glass, or dirt may adhere to the inner surface of the glass plates. This impairs visibility from the outside and cannot be removed in the subsequent process, so strict caution and cleaning / environmental management are required. This is another factor that pushes up the manufacturing cost of double-glazed doors and the like.

The invention according to claim 1 for solving the above problems and achieving the intended purpose
It is a hollow double structure made of a thermoplastic resin having a total light transmittance of 88% or more and a haze of 1% or less, and is arranged so as to spatially separate regions having a temperature difference. The gist is that it is configured so that it can be visually recognized through the inside of the region.
According to the invention of claim 1, the thermoplastic transparent resin is formed into a hollow double-layer structure as compared with the conventional case where two pieces of glass are kept at a required distance to manufacture double-glazed glass. Since only the process is sufficient, the manufacturing process is shortened and the cost is reduced. In addition, since it is lightweight as a whole, it is easy to handle and assemble.

Like a refrigerated showcase, the transparent member that spatially separates the area where there is a temperature difference between the outside and the inside and allows the inside to be visually recognized is made into a hollow double structure of transparent resin that is easy to mold, so the weight is reduced. This makes it extremely easy to handle during manufacturing and opening and closing the door. Further, since the hollow double structure can be resin-molded by extrusion molding or injection molding, dust and dirt do not adhere to the hollow double structure during manufacturing, which facilitates process control and reduces manufacturing cost.

It is a perspective view which shows the preferable embodiment of the internal transmission member which concerns on this invention, and is a hollow structure which has a rectangular opening in an end face, for example, by extrusion molding. FIG. 3 is a perspective view showing a state in which rectangular openings open to both ends of the internal transmissive member shown in FIG. 1 are closed by end face members. It is a perspective view of the case where the hollow structure having a curved surface is formed by applying a required curvature when molding the internal transmissive member shown in FIG. 1. It is a perspective view which shows the internal transmission member which concerns on another Example of this invention, and has a hollow structure whose end face is U-shaped by extrusion molding, for example. It is a perspective view which shows the state which the opening at both ends and the upper end in a longitudinal direction of an internal transmissive member shown in FIG. It is a top view in the case where the light emitting row of LED is provided in the opening in the longitudinal direction of the internal transmissive member shown in FIG. 4, and the inside can be irradiated by LED. It is a perspective view of the internal transmission member provided with the LED light emitting row shown in FIG. It is a perspective view of the modified example in which the thickness of one transparent side plate is made thinner than the thickness of the other transparent side plate in the two transparent side plates of the hollow double structure shown in FIG. It is a perspective view of the internal transmission member which closed the opening of the hollow structure shown in FIG. 8 with an end face member. It is a perspective view of the modified example in which the thickness of one transparent side plate is made thinner than the thickness of the other transparent side plate in the two transparent side plates of the hollow double structure shown in FIG. 4 facing each other. It is sectional drawing of the material case which adopted the double glass for the front glass body. It is a schematic perspective view of a general refrigerated showcase (cooling storage), in which (a) is a type in which the door swings toward the front side to open, and (b) is a type in which the door slides to the left and right to open. The type. It is a perspective view of the general door used in the refrigerated showcase of FIG. It is sectional drawing which used the internal transmission member shown in Example 3 for a door, and corresponds to the case where it was cut along the line AA of FIG. It is a perspective view of the cross-section U-shaped member which comprises the internal transmission member which concerns on Example 4. FIG. It is sectional drawing which used the internal transmission member shown in Example 4 for a door, and corresponds to the case where it was cut along the line AA of FIG. It is sectional drawing which shows another example of the internal transmission member shown in FIG.

Next, a preferred embodiment of the internal transmissive member according to the present invention will be described with reference to the accompanying drawings. In the embodiment, a transparent member replaced with glass fitted in the frame of the glass door 14 in the refrigerated showcase 10 shown in FIG. 12 and a transparent member having a curved surface used for the material case 12 shown in FIG. 11 are assumed. ing. However, the present invention is not limited to these, and is widely applied to, for example, a cooling storage in which a door having a transparent member is provided on the front surface, and a showcase in which a fresh flower is maintained at a low temperature in a fresh flower shop to maintain its freshness. The door.

FIG. 1 shows an example of the internal transmission member 18 according to the present invention, and can be used in place of the glass of the refrigerated showcase 10 in FIG. 12, for example. The internal permeation member 18 is a hollow double structure 28 formed by resin molding a thermoplastic resin having excellent transparency, for example, a polyester copolymer, which will be described later. That is, it is a transparent member that spatially separates a region having a temperature difference between the cooled inside and the outside like a refrigerated showcase, and the inside of the region can be visually recognized from the outside through the internal transmission member 18. It has become. In the hollow double structure, as shown in FIGS. 1, 3, 4, and 8, a transparent plate on the front surface and a transparent plate on the rear surface are arranged to face each other at predetermined intervals. A structure in which at least one side of two transparent plates is integrally connected.

Here, as the material of the transparent thermoplastic resin constituting the internal transmission member 18, for example, a polyester copolymer according to the registered trademark "Tritan" of Eastman Chemical Company is preferably used. It is desirable that the physical properties of the thermoplastic resin represented by the polyester copolymer show good crystallinity at the time of mold molding, and are excellent in toughness and chemical resistance. Further, a glass having a high glass transition temperature (Tg) (for example, 70 ° C. or higher) and a high total light transmittance (for example, 88% or higher) is selected. Further, it is necessary that the resin has very excellent transparency, and the "cloudiness (haze)" as an index thereof is preferably 1% or less, for example. As a transparent thermoplastic resin that satisfies all of the above-mentioned physical properties, the polyester copolymer according to the trademark of "Tritan" has been exemplified, but if these physical properties are satisfied, other thermoplastic resins, for example, polycarbonate copolymer weight. It may be a coalescence, an acrylic copolymer, or a methacrylic styrene copolymer.

The hollow double structure 28 shown in FIG. 1 is formed by melting and softening the raw material of the polyester copolymer, which is a transparent thermoplastic resin, and extruding it with, for example, an extrusion molding machine (not shown). .. Further, injection molding may be performed by an injection molding machine (not shown). The hollow double structure 28 is a long and flat cylinder, and has openings 20 having a rectangular cross section at both ends thereof. The internal transmissive member 18 shown in FIG. 2 is manufactured by closing the openings 20 at both ends of the tubular body having a rectangular cross section with end face members 22 such as a heat insulating member and a cap. That is, in FIG. 1, the hollow double structure 28 is a transparent member that allows the internal contents to be visually recognized from the outside when attached to the door of the cooling storage, for example, the front side of the cooling storage. It is composed of a transparent plate 28a (front surface), a transparent plate 28b on the back surface side (rear surface inside the refrigerator), an upper surface 28c, and a lower surface 28d. Then, as shown in FIG. 2, the internal transmissive member 18 is configured by closing the openings 20 on both sides with the end face members 22 and 22 in the hollow double structure 28, and these end face members 22 and The upper surface 28c and the lower surface 28d are portions that are hidden and invisible when the hollow double structure 28 is fitted into the door frame (not shown) in the refrigerated showcase 10.

The internal permeation member 18 based on the hollow double structure 28 described above further improves the heat insulating performance by sucking internal air and increasing the degree of vacuum when the opening 20 is closed by the end face member 22. You may do so. Further, by substituting the internal air of the hollow double structure 28 with an inert gas such as nitrogen, it is possible to prevent the hollow double structure 28 from being lowered in transparency due to aged deterioration of the resin surface.

Next, as shown in FIG. 4, the internal transmission member 18 according to the embodiment is molded as a hollow double structure 28 having a U-shaped end face, and the three sides of the U-shaped hollow double structure 28. The ends 20 and 20 at both ends similar to those in FIG. 2 and the openings 24 at the upper longitudinal end are closed by the end face member 22 as shown in FIG. It may be. The U-shaped hollow double structure 28 shown in FIG. 4 can also be obtained by extrusion molding a molten resin such as the polyester copolymer with an extrusion molding machine or injection molding with an injection molding machine.

In the U-shaped hollow double structure 28 shown in FIG. 4, since the upper longitudinal end portion is open, the LED light emitting row 26 is arranged in the opening 24 in the longitudinal direction as shown in FIG. After that, the end face member 22 may be closed. At this time, as shown in FIG. 7, since the hollow portion of the internal transmissive member 18 is illuminated by the LED light emitting row 26, the visibility of the stored items is improved and the exhibition effect is also increased. When the internal transmissive member 18 shown in FIGS. 2 and 5 and 9 which will be described later is used as an opening / closing door of a refrigerated showcase or the like, a frame may be fitted into the internal transmissive member 18. If necessary, a handle, a hinge, etc. may be attached.

Further, as shown in FIG. 3, any of the internal transmission members 18 shown in FIGS. 1 and 4 may be provided with a required curved surface at the time of molding by extrusion molding or injection molding. The internal transmissive member 18 having a curved surface thus obtained can be suitably used in place of the front glass plate 16 of the material case 12 shown in FIG.

FIG. 13 is a perspective view of a door that slides to the left and right of the refrigerated showcase 10 shown in FIG. 12 (b) and employs an internal transmissive member according to the third embodiment below. That is, FIG. 13 is a perspective view in the case where the hollow double structure 28 made of the internal transmissive member described in the embodiment is used instead of the glass of the glass door 14 used in the refrigerated showcase 10 of FIG. A frame 30 made of aluminum or resin is fitted around the rectangular hollow double structure 28. The frame body 30 is composed of left and right vertical frames 30a and 30b, an upper rail 30c as an upper horizontal frame, and a lower rail 30d as a lower horizontal frame, and the left vertical frame 30a has a U shape for opening and closing a door. The handle 30e is integrally molded. In FIG. 13, the front side is a region outside the refrigerated showcase 10 to which the door 14 is attached, and the hollow double structure 28 is a portion where the user can visually recognize the inside of the refrigerator from the outside (hereinafter, "" It is called "visual surface").

The internal permeation member in the door 14 shown in FIG. 13 is the hollow double structure 28 described in FIG. 1 showing the first embodiment. However, this hollow double structure 28 is constructed by molding the polyester copolymer described above as an example, and is vulnerable to heat due to the nature of the resin, and has a drawback that it melts or burns at a high temperature. .. For this reason, for example, the fire resistance standard is high at the installation location such as a refrigerated showcase, and the use is restricted in an environment where "delayed flame" of UL94HB is required. Therefore, it is proposed to add a flame retardant to the resin of the polyester copolymer to improve the flame retardancy, but since the transparency as a whole is lowered, the internal visibility is as high as the door of a showcase. Is not suitable for the part where

Therefore, a proposal that makes it possible to use the internal visual recognition member of the present invention even in the place where flame retardancy is required is the configuration according to the third embodiment. That is, as shown in FIG. 14, one outer surface (outside the door 14 in the refrigerated showcase 10 of FIG. 12) which is the visible surface of the hollow double structure 28 has excellent total light transmittance and is nonflammable. A plate body 34 made of glass or a flame-retardant resin material is arranged. Here, as the flame-retardant and transparent resin, for example, polycarbonate, polyvinyl chloride, or the like can be used. In order to improve the efficiency of incorporating the door 14 into the frame 30 made of aluminum or resin, the frame 30 may be fixed with tape, an adhesive or other caulking agent, but it is transparent in the visible range. It is recommended to use a transparent material to ensure the properties. Further, in order to attach the handle 30e and the rails 30c and 30d, the portion hidden by the frame may be fixed, or the handle 30e and the rails 30c and 30d may be fixed in a sandwiched state without using a tape or an adhesive.

According to the third embodiment, since the glass or flame-retardant resin plate 34 is arranged only on one outer surface of the hollow double structure 28, the outer shell of the showcase door is inexpensively transparent while being flame-retardant. I secured the sex. Further, since the hollow double structure 28 has a cylindrical body having a rectangular cross section and has no breaks, the overall strength can be increased. Further, when the glass arranged on the outer surface is broken or the flame-retardant resin is damaged, only the plate body 34 on the outer surface can be easily replaced without breaking the airtightness of the double structure. Because it can be done, the door can be repaired quickly and inexpensively.

Since the internal transmissive member according to the third embodiment described above has improved flame retardancy, it is excellent in that it clears the standard of UL94HB. However, since the outer surface of the hollow double structure 28 is attached with a nonflammable glass or a flame-retardant resin plate 34, it is undeniable that the transparency is slightly lowered. Further, when the plate body 34 is arranged on the outer surface of the hollow double structure 28 by sticking or the like, if dust or air bubbles enter between the both members 28 and 34, that portion becomes conspicuous. ..

Therefore, as shown in FIG. 15, the hollow double structure 28 of the internal transmissive member according to the fourth embodiment is formed as a member having a U-shaped cross section with one surface to be the visible surface open, and the open surface thereof. A plate 34 made of nonflammable glass or a flame-retardant resin material, which has excellent total light transmittance and is made of a flame-retardant resin material, is arranged in the opening 29. For example, the hollow double structure 28 is extruded into a U-shaped cross section as shown in FIG. 15, and as shown in FIG. 16, the hollow double structure 28 is said to close (close) the opening 29 open to one of the visible surfaces. The plate body 34 is arranged. At this time, it is preferable to insert a sealing material 36 having adhesiveness inside the hollow double structure 28 that is closed by the plate body 34 so that airtightness is ensured. Further, as shown in another example of FIG. 17, when a step portion 38 is formed at the open end edge portion of the hollow double structure 28 and the plate body 34 is arranged on the step portion 38 via the sealing material 36. , Airtightness is further ensured. Further, since the plate body 34 does not deviate from the opening of the hollow double structure 28 due to the presence of the step portion 38, the assembling property is further improved.

In both the hollow double structure 28 according to the fourth embodiment shown in FIG. 16 and the hollow double structure 28 according to another example of the fourth embodiment shown in FIG. 17, as described with respect to these figures, The openings at both ends of the tubular body having a rectangular cross section are closed by the end face member 22 such as the heat insulating member or the cap. That is, although not shown, the hollow double structure 28 closes a U-shaped cross-section member obtained by extrusion-molding or injection-molding the thermoplastic resin and the opening 29 of the U-shaped cross-section member. It is composed of a formed plate body 34 and an end face member 22 that closes end portions open to both sides of the U-shaped cross-section member.

According to the fourth embodiment, since the glass or the flame-retardant resin is arranged only on the outer surface of the transparent body in the door 14, the flame-retardant property is inexpensively provided and good transparency is ensured. In addition, the weight can be reduced as compared with the case where the hollow double structure 28 is attached. Further, as shown in FIG. 3, in the case of a curved surface shape, the curved surfaces do not overlap, so that the configuration can be easily performed.

(Change example)
The hollow double structure 28 having a rectangular cross section shown in FIG. 1 and the U-shaped hollow double structure 28 shown in FIG. 4 both face each other on the front side (front surface) and the back side (rear surface). ), The thickness of the transparent plate 28b is the same. However, as shown in FIGS. 8 and 10, the thickness of one of these transparent plates may be thinner than the thickness of the other. For example, in the hollow double structure 28 shown in FIGS. 8 and 10, the front surfaces of the two transparent plates 28a (this is the front side) and the transmission plates 28b (this is the back side) facing each other. The thickness dimension α of the transparent plate 28a on the side is set to be larger than the thickness dimension β of the transparent plate 28b on the back surface side (α> β). This is because, assuming that the internal transmission member 18 is used as a visible part of the door in the cooling storage 10 such as a refrigerating showcase, the transmission plate 28a on the outside (front side) has a large stress depending on the usage situation. Is expected to be added. Therefore, the transmission plate 28a on the front side of the hollow double structure 28 is provided with a thickness sufficient to withstand the stress in the assumed range. On the other hand, it is relatively unlikely that a large stress is directly applied to the transmission plate 28b on the inside (back side) of the hollow double structure 28 from both the outside and the inside. That is, it is sufficient that the transparent plate 28b on the back side constitutes a hollow body that functions as a heat insulating space between the transparent plate 28b on the front side and the transparent plate 28a on the front side.

Therefore, as shown in FIGS. 8 and 10, it is preferable that the thickness (β) of the transparent plate 28b on the back side is thinner than the thickness (α) of the transparent plate 28a on the front side in the hollow double structure 28. .. That is, by thinning the transparent plate 28b on the back surface side, the material cost required for molding can be reduced, and the overall weight of the internal transparent member 18 as a finished product is further reduced. Further, by thinning the transmission plate 28b on the back surface side, the light transmittance is further improved. The end face member 22 is attached to an opening of a rectangular (or U-shaped) hollow double structure 28 formed so that the thickness of the other transmission plate 28b is thinner than the thickness of one of the transmission plates 28a. By closing the above, for example, the internal transmissive member 18 shown in FIG. 9 can be obtained.

The internal permeation member according to the present invention described in Examples 1 to 4 is preferably used for the door 14 in which the inside can be visually recognized from the outside of the refrigerated showcase 10. The door 14 can be suitably used for both the type shown in FIG. 12 (a) that swings toward the front side and opens, and the type shown in FIG. 12 (b) that slides left and right to open.

22 End face member, 28 Hollow double structure, 28a, 28b transmission plate, 29 opening,
34 board

Claims (10)

A hollow double structure (28) made of a thermoplastic resin having a total light transmittance of 88% or more and a haze of 1% or less, and arranged so as to spatially separate regions having a temperature difference. As a result, the internal transmissive member is configured so that it can be visually recognized through the inside of the region. A non-flammable / flame-retardant glass or resin material plate (34) having excellent total light transmittance is disposed on one outer surface of the hollow double structure (28) which is a visible surface. The internal transmissive member according to claim 1. The hollow double structure (28) is formed in a U-shaped cross section in which one of the visible surfaces is open, and the open opening (29) is nonflammable with excellent total light transmittance. The internal transmissive member according to claim 1, which is closed with a plate body (34) made of flame-retardant glass or a resin material. The hollow double structure (28) closes a hollow body having a rectangular end face obtained by extrusion molding or injection molding of the thermoplastic resin, and ends open to both sides of the hollow body. The internal transmissive member according to claim 1, which comprises an end face member (22). The hollow double structure (28) is open to a U-shaped end face obtained by extrusion-molding or injection-molding the thermoplastic resin, and both sides of the U-shaped hollow body and in the longitudinal direction. The internal transmissive member according to claim 1, further comprising an end face member (22) that closes the end portion. The hollow double structure (28) closes a U-shaped cross-section member obtained by extrusion-molding or injection-molding the thermoplastic resin and the opening (29) of the U-shaped cross-section member. The internal transmissive member according to claim 3, further comprising a plate body (34) and an end face member (22) that closes end portions open on both sides of the U-shaped cross-section member. The internal transmissive member according to any one of claims 1 to 6, wherein the hollow double structure (28) is provided with a curved surface when molded by extrusion molding or injection molding. The first aspect of claim 1, wherein the two transmission plates (28a, 28b) constituting the hollow double structure (28) are formed so that the thickness of one transmission plate is smaller than the thickness of the other transmission plate. Internal transparent member. The internal permeation according to any one of claims 1 to 8, wherein a material such as a polyester copolymer, a polycarbonate copolymer, an acrylic copolymer, or a methacrylic styrene copolymer is selectively used as the thermoplastic resin. Element. A cooling storage using the internal permeation member according to any one of claims 1 to 9.

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