Raw material for dust-catching sheet for the cold air regulating fluid of a refrigerated open display case and method for using the raw material for dust-catching sheet for the cold air regulating fluid of a refrigerated open display case

Abstract

This facilitates the management of the dimensions of dust-catching sheets when attaching them to the cold air circulation fluid of refrigerated open display cases or when replacing those dust-catching sheets. [Solution] A dust-catching sheet raw material 1 is prepared in a store where a refrigerated open display case 10 is installed. The cold air purifying fluid 22 is removed from the cold air outlet 14 of the refrigerated open display case 10. Then, a strip-shaped mesh sheet 3 is pulled out from the dust-catching sheet raw material 1 prepared in the store. The strip-shaped mesh sheet 3 is cut to a length corresponding to the length of the cold air purifying fluid 22 to create a long, narrow rectangular dust-catching sheet 7. Then, the dust-catching sheet 7 is attached to the top surface 24 of the cold air purifying fluid 22, and the cold air purifying fluid 22 is attached to the cold air outlet 14 of the refrigerated open display case 10.

Description

Technical Field

[0001] The present invention relates to a sheet stock for dust capture of an air conditioner in a refrigerated open showcase and a method for using the sheet stock for dust capture.

Background Art

[0002] In stores such as supermarkets, drugstores, and convenience stores, refrigerated open showcases for displaying products such as fresh food and beverages in a refrigerated state are used.

[0003] A refrigerated open showcase has a product display chamber with an open front, an air outlet for blowing cold air downward from the upper front end of the product display chamber so as to form an air curtain of cold air at the front opening of the product display chamber, and an air conditioner detachably attached to the air outlet of the cold air. (See, for example, Patent Document 1).

[0004] The air conditioner is formed in a long and thin block shape on the left and right so as to fit into the air outlet of the cold air of the refrigerated open showcase. The air conditioner has a large number of air rectifying holes penetrating in the vertical direction, and laminar flow of cold air is formed by passing cold air through the air rectifying holes.

[0005] By the way, when the refrigerated open showcase is operated, dust contained in the cold air adheres to the upper surface of the air conditioner, and when the dust accumulates, a large amount of dust may accumulate on the upper surface of the air conditioner. On the other hand, since the air conditioner is installed at a part where cold air and outside air come into contact, condensation may occur. Therefore, when a large amount of dust accumulates on the upper surface of the air conditioner, the dust contains moisture and mold is generated, which is unsanitary.

[0006] A commonly known method for maintaining the hygiene of this refrigerated fluid is to periodically remove it from the refrigerated open display case and wash it with water or a cleaning solution. However, when washing the refrigerated fluid with water or a cleaning solution, it is necessary to wipe off any moisture from the fluid and dry it before reattaching it to the refrigerated open display case's cold air outlet, which requires considerable effort and time.

[0007] Therefore, the inventor of the present application has proposed a dust-capturing sheet that is attached to the upper surface of the cold air purifying fluid in a refrigerated open display case, in order to remove dust that accumulates on the upper surface of the cold air purifying fluid without having to wash the cold air purifying fluid with water or cleaning solution, and has already obtained a patent for this (Patent Document 1).

[0008] The dust-capturing sheet described in Patent Document 1 is a long, narrow rectangular sheet formed by heat-cutting a mesh sheet, which is woven with warp and weft threads of synthetic resin to form a grid-like mesh, to the same size as the top surface of the cold air conditioning fluid. This sheet is then attached to the top surface of the cold air conditioning fluid for use. Heat cutting is a cutting method in which heat is applied to melt the synthetic resin threads while cutting, so as not to fray them.

[0009] For example, if the cold air purifying fluid has a top surface that is a long, narrow rectangle with a width of 8 cm and a length of 90 cm, a dust-catching sheet is prepared by heat-cutting a mesh sheet made of synthetic resin into a long, narrow rectangle with a width of 8 cm and a length of 90 cm (i.e., a rectangle the same size as the top surface of the cold air purifying fluid), and this dust-catching sheet is attached to the top surface of the cold air purifying fluid for use.

[0010] By attaching this dust-capturing sheet to the top surface of the cold air purifying fluid, dust contained in the cold air is captured by the dust-capturing sheet as cold air flows into the fluid. By simply replacing the dust-capturing sheet periodically, it is possible to maintain the hygiene of the cold air purifying fluid without having to wash the fluid with water or cleaning solution. [Prior art documents] [Patent Documents]

[0011] [Patent Document 1] Patent No. 7216416 [Overview of the project] [Problems that the invention aims to solve]

[0012] Incidentally, when the inventors of the present invention actually performed the installation and replacement of the dust-catching sheets in the cold air circulation fluid of refrigerated open display cases in stores such as supermarkets, they encountered the problem that managing the dimensions of the dust-catching sheets during these operations was complicated.

[0013] In other words, supermarkets and similar stores typically have multiple refrigerated open display cases installed, and each refrigerated open display case is equipped with one to several cooling fluid units. Therefore, the total number of cooling fluid units used in a single store can be quite large (for example, several dozen).

[0014] Furthermore, the dimensions of the cooling fluid tubes in refrigerated open display cases are not currently standardized. The length and width of the cooling fluid tubes vary depending on the manufacturer and model of the refrigerated open display case, and sometimes multiple cooling fluid tubes of different lengths and widths are used within a single refrigerated open display case. For example, cooling fluid tubes can be 60cm, 90cm, or 120cm long, and their widths can be 5cm, 7.2cm, 8cm, or 10cm long, with various correspondences between length and width.

[0015] Therefore, in order to attach dust-catching sheets to the refrigerated air purifiers or replace those sheets in stores such as supermarkets, it is necessary to first determine the length and width of each refrigerated air purifier used in the store and then prepare dust-catching sheets of various sizes that correspond to those dimensions.

[0016] However, it is cumbersome to determine the length and width dimensions of all the cooling fluids used in the store in advance.

[0017] Furthermore, even if the dimensions of all the refrigerated fluids used in the store are known and dust-catching sheets of various sizes corresponding to those dimensions are prepared in advance, there is a problem in that it is not easy to determine which dust-catching sheet corresponds to which refrigerated fluid when attaching the prepared dust-catching sheets to multiple refrigerated fluids removed from multiple open refrigerated display cases.

[0018] As described above, the inventors of this invention faced the problem that managing the dimensions of dust-catching sheets is cumbersome when attaching them to cold air conditioning fluids or replacing them in stores such as supermarkets.

[0019] Furthermore, when there are many long, rectangular dust-catching sheets, there is a problem in that they are difficult to handle. In other words, when there are many sheets in general, they are often handled in an overlapping state, but since dust-catching sheets are made of synthetic resin, their surface is slippery, and because they have an elongated shape that corresponds to the shape of the cold air purifying fluid, when many dust-catching sheets are stacked, the sheets tend to slip and collapse, making it difficult to stack them stably. Furthermore, dust-catching sheets, which are woven using synthetic resin warp and weft threads to form a grid-like mesh, have a problem where the cut ends of the synthetic resin threads at the edges of the sheet tend to snag. For example, when removing one dust-catching sheet from a stack of many sheets, the edge of that sheet may catch on the mesh of the other sheets, causing them to come out together. Also, when trying to put a removed dust-catching sheet back into the stack of many sheets, the edge of that sheet will catch on the mesh of the other sheets, making it difficult to put back smoothly. Thus, it is difficult to stack many dust-catching sheets stably, and because the cut ends of the synthetic resin threads at the edges of the sheets tend to snag, there is also the problem that dust-catching sheets are difficult to handle when there are many of them.

[0020] The object of this invention is to facilitate the management of the dimensions of dust-catching sheets when attaching them to the cold air circulation fluid of refrigerated open display cases in stores such as supermarkets, or when replacing those dust-catching sheets. [Means for solving the problem]

[0021] The inventors of this application conceived the idea that if a store prepares a roll of sheet material consisting of strip-shaped mesh sheets that are long (e.g., 20m) and have a width (e.g., 8cm) corresponding to the width of the chilled air purifying fluids used in the store (e.g., a supermarket), then the store can pull out the strip-shaped mesh sheets from the sheet material and cut them to match the length of each chilled air purifying fluid removed from a refrigerated open display case to create dust-capturing sheets. This eliminates the need to know the length of each chilled air purifying fluid used in the store in advance, and makes it easier to manage the dimensions of the dust-capturing sheets.

[0022] Based on this idea, in order to solve the above problems, this invention provides a sheet material for capturing dust in the cold air purifying fluid of a refrigerated open display case, having the following configuration. [Configuration 1] A roll of long, strip-shaped mesh sheets, less than 10 cm wide, formed by weaving warp and weft threads of synthetic resin to create a grid-like mesh, which are then wound into a roll. This is a raw material for dust-catching sheets in the cold air circulation fluid of refrigerated open display cases.

[0023] Using a dust-capturing sheet raw material with this configuration, when attaching dust-capturing sheets to refrigerated fluids used in stores such as supermarkets, or when replacing those dust-capturing sheets, it is possible to create dust-capturing sheets corresponding to each refrigerated fluid by pulling out a strip of mesh sheet from the dust-capturing sheet raw material in the store and cutting that strip of mesh sheet to a length corresponding to the length of each refrigerated fluid removed from the refrigerated open display case. Therefore, it becomes unnecessary to know the length dimensions of each refrigerated fluid used in the store in advance, and it becomes possible to easily match the dust-capturing sheets with the refrigerated fluids, making it easier to manage the dimensions of the dust-capturing sheets.

[0024] In addition, for the sheet stock for dust collection obtained by winding a long strip-shaped mesh sheet into a roll shape, the end of the strip-shaped mesh sheet can be fixed to the outer periphery of the sheet stock for dust collection with an adhesive tape, a rubber band, etc., so that the roll shape can be stably maintained. Further, since the strip-shaped mesh sheet is drawn out from the sheet stock for dust collection and the strip-shaped mesh sheet is cut to create the sheet for dust collection, the sheets for dust collection can be obtained in the required number at the required timing, and there is no need to stack a large number of sheets for dust collection. Therefore, it is easy to handle and has excellent practicality.

[0025] [Configuration 2] The sheet stock for dust collection of the cold air rectifier of the refrigerated open showcase according to Configuration 1, wherein the edges on both sides in the width direction of the strip-shaped mesh sheet are fray-proofed by applying heat to melt them.

[0026] When this configuration is adopted, when a long strip-shaped mesh sheet is drawn out from the sheet stock for dust collection and the strip-shaped mesh sheet is cut to form the sheet for dust collection, it is possible to prevent the fraying of the yarn at the long side portion of the sheet for dust collection.

[0027] That is, the sheet for dust collection is formed in an elongated rectangular shape corresponding to the upper surface of the elongated block-shaped cold air rectifier. Among its long side and short side, the short side portion has short yarn even if it frays, so it is less likely to cause problems, and the fraying of the yarn becomes a problem at the long side portion. Therefore, at the stage of the long strip-shaped mesh sheet before it becomes the sheet for dust collection, the edges on both sides in the width direction of the strip-shaped mesh sheet are pre-melted by applying heat to prevent fraying, so that when the long strip-shaped mesh sheet is cut to form the sheet for dust collection, it is possible to obtain a sheet for dust collection with the long side portion fray-proofed.

[0028] [Configuration 3] The sheet stock for dust collection of the cold air rectifier of the refrigerated open showcase according to Configuration 1 or Configuration 2, wherein the length of the strip-shaped mesh sheet is 20 m or more.

[0029] ; This configuration allows for the creation of numerous dust-catching sheets from a single roll of dust-catching sheet material, as the length of the strip-shaped mesh sheet that makes up the raw material is long. Therefore, after installing dust-catching sheets on the cold air conditioning system in a store and replacing those sheets, the remaining raw material can be used for the next dust-catching sheet replacement, making it economical.

[0030] Furthermore, this invention also provides the following configuration as a method for using the dust-catching sheet raw material with the above configuration. [Structure 4] A sheet material preparation process is performed in which a dust-catching sheet material described in any of configurations 1 to 3 is prepared in a store equipped with a refrigerated open display case, A step of removing the cold air regulating fluid from the cold air outlet of the refrigerated open showcase installed in the store, After the sheet raw material preparation step and the cold air purifying fluid removal step, the sheet cutting step involves pulling out the strip-shaped mesh sheet from the dust-capturing sheet raw material prepared in the store, cutting the strip-shaped mesh sheet to a length corresponding to the length dimension of the cold air purifying fluid removed from the refrigerated open showcase, and creating a long, narrow rectangular dust-capturing sheet. The process includes, after the sheet cutting step, attaching the dust-capturing sheet to the upper surface of the cold air conditioning fluid, and then attaching the cold air conditioning fluid to the cold air outlet of the refrigerated open showcase. Instructions for using dust-catching sheet material.

[0031] [Composition 5] In the sheet raw material preparation step, multiple types of dust-catching sheet raw materials with different width dimensions are prepared. The method for using a dust-catching sheet raw material according to configuration 4, wherein in the sheet cutting step, a dust-catching sheet raw material having a width dimension corresponding to the width dimension of the cold air purifying fluid taken out from the refrigerated open showcase is selected from among the multiple types of dust-catching sheet raw materials, and the dust-catching sheet is made using the selected dust-catching sheet raw material.

[0032] By adopting this configuration, even when multiple types of cold air conditioning fluids with different widths are used in a store, it becomes possible to create dust-catching sheets with widths corresponding to the width of each cold air conditioning fluid by preparing dust-catching sheet raw materials with widths corresponding to the widths of each fluid. [Effects of the Invention]

[0033] By using the dust-capturing sheet raw material for the cold air purifying fluid of a refrigerated open display case according to this invention, when attaching dust-capturing sheets to cold air purifying fluids used in stores such as supermarkets, or when replacing those dust-capturing sheets, a strip-shaped mesh sheet can be pulled out from the dust-capturing sheet raw material in the store, and the strip-shaped mesh sheet can be cut to a length corresponding to the length of each cold air purifying fluid removed from the cold air outlet of the refrigerated open display case, thereby creating dust-capturing sheets corresponding to each cold air purifying fluid. Therefore, it is not necessary to know the length dimensions of each cold air purifying fluid used in the store in advance, and it is possible to easily match the dust-capturing sheets with the cold air purifying fluids, making it easy to manage the dimensions of the dust-capturing sheets.

[0034] Furthermore, a roll of long, strip-shaped mesh sheets can be kept stable by securing the ends of the strip-shaped mesh sheets to the outer circumference of the roll with adhesive tape or rubber bands. Also, since dust-catching sheets are created by pulling out strip-shaped mesh sheets from the roll and cutting them, only the necessary number of dust-catching sheets can be obtained at the necessary time, eliminating the need to stack many dust-catching sheets. Therefore, it is easy to handle and highly practical. [Brief explanation of the drawing]

[0035] [Figure 1] A perspective view showing a sheet material for capturing dust in the cold air conditioning fluid of a refrigerated open display case according to an embodiment of this invention. [Figure 2] Figure 1 is a perspective view showing a strip of mesh sheet pulled out from a raw material of dust-catching sheet. [Figure 3] Enlarged view of the strip-shaped mesh sheet shown in Figure 2. [Figure 4] Cross-sectional view along line AA in Figure 3 [Figure 5] Cross-sectional view showing an example of a refrigerated open display case. [Figure 6] (a) A diagram showing a strip of mesh sheet pulled from the dust-capturing sheet raw material shown in Figure 2, and the strip of mesh sheet arranged along the cold air purifying fluid; (b) A diagram showing a dust-capturing sheet created by cutting the strip of mesh sheet shown in (a) to a length corresponding to the length of the cold air purifying fluid; (c) A diagram showing the attachment device installed on the cold air purifying fluid shown in (b). [Figure 7] A partially cutaway side view showing the cold air rectification fluid with the dust-capturing sheet attached. [Figure 8] A partially cutaway plan view of the cold air rectifier fluid with the dust-capturing sheet attached, viewed from the top. [Figure 9] Cross-sectional view along line BB in Figure 8 [Figure 10] Cross-sectional view along the CC line in Figure 8 [Figure 11] Figure 8 is an exploded perspective view showing a magnified view of the dust-catching sheet and the longitudinal end of the cold air conditioning fluid. [Modes for carrying out the invention]

[0036] Figures 1 and 2 show the sheet material 1 (hereinafter simply referred to as "sheet material 1") for capturing dust in the cold air conditioning fluid of the refrigerated open display case of this embodiment. Sheet material 1 has a core 2 and a long strip-shaped mesh sheet 3 wound in a roll shape around the outer circumference of the core 2. The ends of the strip-shaped mesh sheet 3 are fastened to the outer circumference of sheet material 1 with adhesive tape 4.

[0037] As shown in Figures 3 and 4, the strip-shaped mesh sheet 3 is formed by plain weaving warp threads 5 and weft threads 6. The warp threads 5 are threads that extend in the length direction of the strip-shaped mesh sheet 3, and the weft threads 6 are threads that extend in the width direction of the strip-shaped mesh sheet 3. Each warp thread 5 is arranged parallel to the others with a predetermined gap between them, and each weft thread 6 is also arranged parallel to the others with a predetermined gap between them, so that the warp threads 5 and weft threads 6 form a grid-like mesh. The spacing between adjacent warp threads 5 is set to 0.5 mm or more and 1.5 mm or less, and the spacing between adjacent weft threads 6 is also set to 0.5 mm or more and 1.5 mm or less.

[0038] The warp threads 5 and weft threads 6 are made of synthetic resin. It is preferable to use polyethylene (PE) as the synthetic resin forming the warp threads 5 and weft threads 6. Using polyethylene (PE) prevents mold growth due to condensation when the dust-catching sheet 7 (described later) is attached to the cold air conditioning fluid 22, because polyethylene has extremely low water absorption.

[0039] The edges on both sides of the strip-shaped mesh sheet 3 in the width direction (vertical direction in the figure) shown in Figure 3 are prevented from fraying by applying heat and melting them. Specifically, the cut ends 6a of the weft threads 6 melt and deform when heat is applied, and by catching on or fusing with the warp threads 5 located at the ends of the strip-shaped mesh sheet 3 in the width direction (vertical direction in the figure), the warp threads 5 located at the ends of the strip-shaped mesh sheet 3 in the width direction (vertical direction in the figure) are prevented from unraveling.

[0040] The width of the strip-shaped mesh sheet 3 shown in Figures 1 and 2 is set to a predetermined dimension of 10 cm or less (104 mm or less). That is, as the cold air conditioning fluid 22 used in a refrigerated open showcase 10 as shown in Figure 5, for example, widths of 50 mm, 72 mm, 80 mm, and 100 mm are known.

[0041] Therefore, corresponding to the width of these cold air conditioning fluids 22, the width of the strip-shaped mesh sheet 3 shown in Figures 1 and 2 can be set to the following ranges: 46 mm to 54 mm (for 50 mm width), 68 mm to 76 mm (for 72 mm width), 76 mm to 84 mm (for 80 mm width), and 96 mm to 104 mm (for 100 mm width). In all cases, the width of the strip-shaped mesh sheet 3 is 104 mm or less (10 cm or less). The length of the strip-shaped mesh sheet 3 is set to 20 m or more (preferably 30 m or more, for example 50 m).

[0042] The sheet raw material 1 shown in Figures 1 and 2 can be manufactured, for example, as follows. First, a wide mesh sheet (not shown) that is wide (for example, 1020 mm wide) and long is manufactured, and this wide mesh sheet is wound up to obtain a primary roll. Next, the wide mesh sheet is unwound from the primary roll, and the unwound wide mesh sheet is cut by multiple cutters placed at regular intervals in the width direction of the wide mesh sheet to divide it into multiple strip-shaped mesh sheets 3, and these multiple strip-shaped mesh sheets 3 are wound onto a winding core 2 (see Figure 2) placed parallel to the primary roll. Here, the cutters that divide the wide mesh sheet into multiple strip-shaped mesh sheets 3 cut the wide mesh sheet while melting it at a high temperature. As a result, the edges of the strip-shaped mesh sheets 3 are prevented from fraying.

[0043] Figure 5 shows an example of a refrigerated open display case 10. A refrigerated open display case 10 is a display case for displaying products such as fresh food and beverages in a refrigerated state, and is generally installed in stores such as supermarkets, drugstores, and convenience stores.

[0044] The refrigerated open showcase 10 has a product display compartment 13 with an open front, a cold air outlet 14 that blows cold air downward from the upper front end of the product display compartment 13 so as to form a cold air curtain at the front opening of the product display compartment 13, a cold air rectifier 22 that is detachably attached to the cold air outlet 14, a cold air intake 15 that opens at the lower front end of the product display compartment 13, and a cold air passage 16 that connects the outlet 14 and the intake 15 inside the device. The cold air passage 16 is provided with a cooling device 18 that cools the air inside the cold air passage 16 and a cold air fan 17 that moves the air inside the cold air passage 16 from the intake 15 to the outlet 14.

[0045] The cold air straightening fluid 22 is formed in an elongated block shape, extending left and right (in the direction perpendicular to the plane of the paper in the figure), so as to fit into the cold air outlet 14. As shown in Figure 9, the cold air straightening fluid 22 has a number of cold air straightening holes 23 that penetrate in the vertical direction, and by passing cold air through these cold air straightening holes 23, a laminar flow of cold air is formed.

[0046] When the refrigerated open display case 10 is in operation, dust contained in the cold air adheres to the upper surface 24 of the cold air purifying fluid 22, and as this dust accumulates, a large amount of dust may build up on the upper surface 24 of the cold air purifying fluid 22. On the other hand, since the cold air purifying fluid 22 is installed in the part where the cold air in the cold air passage 16 comes into contact with the outside air, condensation may occur. Therefore, if a large amount of dust accumulates on the upper surface 24 of the cold air purifying fluid 22, the dust will absorb moisture and mold will grow, making it unsanitary.

[0047] A commonly known method for maintaining the hygiene of the cold air purifying fluid 22 is to periodically remove it from the refrigerated open display case 10 and wash it with water or a cleaning solution. However, when washing the cold air purifying fluid 22 with water or a cleaning solution, it is necessary to wipe off any moisture from the cold air purifying fluid 22 and dry it before reattaching it to the cold air outlet 14 of the refrigerated open display case 10, which requires considerable effort and time.

[0048] Therefore, as shown in Figures 7 and 8, by attaching a long, narrow rectangular dust-catching sheet 7, which is the same size as the top surface 24 of the cold air purifying fluid 22, when cold air flows into the cold air purifying fluid 22, the dust contained in the cold air is captured by the dust-catching sheet 7. By simply replacing the dust-catching sheet 7 periodically, it is possible to maintain the hygiene of the cold air purifying fluid 22 without having to wash the cold air purifying fluid 22 with water or cleaning solution.

[0049] On the other hand, supermarkets and other stores typically have multiple refrigerated open display cases 10, as shown in Figure 5, installed inside. Furthermore, each refrigerated open display case 10 is equipped with one to several cold air regulating fluids 22. As a result, the total number of cold air regulating fluids 22 used in a single store can be quite large (for example, several dozen).

[0050] Furthermore, the dimensions of the cooling fluid 22 are not currently standardized, and the length and width of the cooling fluid 22 vary depending on the manufacturer and model number of the refrigerated open display case 10. In addition, multiple cooling fluids 22 of different lengths and widths may be used within a single refrigerated open display case 10. For example, the lengths of the cooling fluid 22 can be 60 cm, 90 cm, or 120 cm, and the widths can be 5 cm, 7.2 cm, 8 cm, or 10 cm, with various correspondences between length and width.

[0051] Therefore, in order to attach dust-catching sheets 7 to the cold air conditioning fluid 22 or replace those dust-catching sheets 7 in stores such as supermarkets, as shown in Figures 7 and 8, it is necessary to first determine the length and width dimensions of each cold air conditioning fluid 22 used in the store and prepare dust-catching sheets 7 of various dimensions that correspond to those dimensions.

[0052] However, it is cumbersome to determine the length and width dimensions of all the cooling fluids 22 used in the store in advance.

[0053] Furthermore, even if the dimensions of all the cooling fluids 22 used in the store are known and dust-catching sheets 7 of various dimensions corresponding to those dimensions are prepared in advance, there is a problem in that it is not easy to determine which dust-catching sheet 7 corresponds to which cooling fluid 22 when attaching the prepared dust-catching sheets 7 to multiple cooling fluids 22 removed from multiple refrigerated open display cases 10.

[0054] Furthermore, when there are many of the elongated rectangular dust-catching sheets 7 shown in Figure 11, there is a problem in that the dust-catching sheets 7 are difficult to handle. In other words, generally, when there are many sheets, they are often handled in an overlapping state, but since the dust-catching sheets 7 are made of synthetic resin, their surface is slippery, and because they have an elongated shape corresponding to the shape of the cold air purifying fluid 22, when many dust-catching sheets 7 are stacked, the sheets tend to slip and collapse, making it difficult to stack them stably. Furthermore, the dust-catching sheet 7, which is formed by weaving synthetic resin warp threads 5 and weft threads 6 to form a grid-like mesh, has cut ends 6a (see Figure 3) of synthetic resin threads located at the periphery of the sheet that are prone to snagging. For example, when removing one dust-catching sheet 7 from a stack of many dust-catching sheets 7, the periphery of that one dust-catching sheet 7 may get caught in the mesh of the other dust-catching sheets 7, causing the other dust-catching sheets 7 to come out together. Also, when trying to put a removed dust-catching sheet 7 back into the stack of many dust-catching sheets 7, the periphery of that one dust-catching sheet 7 may get caught in the mesh of the other dust-catching sheets 7, making it difficult to put back smoothly. Thus, it is difficult to stably stack many dust-catching sheets 7, and because the cut ends 6a (see Figure 3) of synthetic resin threads located at the periphery of the sheet are prone to snagging, there is also the problem that the dust-catching sheets 7 are difficult to handle when there are many of them.

[0055] Therefore, in order to address the above-mentioned problems, this embodiment uses the sheet material 1 shown in Figures 1 and 2 to perform the work of attaching dust-catching sheets 7 to the cold air purifying fluid 22 of the refrigerated open showcase 10 shown in Figure 5, and the work of replacing those dust-catching sheets 7. Below, an example of the work of attaching dust-catching sheets 7 to the cold air purifying fluid 22 of the refrigerated open showcase 10 shown in Figure 5, using the sheet material 1 shown in Figures 1 and 2, will be explained.

[0056] [Sheet raw material preparation process] The sheet raw material 1 shown in Figures 1 and 2 is prepared in stores such as supermarkets where the refrigerated open display cases 10 shown in Figure 5 are installed. At this time, the width dimensions of the cold air regulating fluid 22 in each refrigerated open display case 10 installed in the store are checked in advance, and if multiple types of cold air regulating fluid 22 with different width dimensions are used in the store, sheet raw material 1 of the width corresponding to each width dimension is prepared. For example, if multiple refrigerated open display cases 10 installed in the store use cold air regulating fluid 22 with a width of 80 mm and cold air regulating fluid 22 with a width of 100 mm, two types of sheet raw material 1 are prepared: sheet raw material 1 for 80 mm width (width of 76 mm to 84 mm) and sheet raw material 1 for 100 mm width (width of 96 mm to 104 mm).

[0057] [Cold air rectifier fluid removal process] Next, the cold air rectifier fluid 22 is removed from the cold air outlet 14 of the refrigerated open display case 10 shown in Figure 5.

[0058] [Sheet cutting process] Subsequently, as shown in Figures 6(a) and (b), a strip-shaped mesh sheet 3 is pulled from the sheet roll 1 prepared in the store, and the strip-shaped mesh sheet 3 is cut to a length corresponding to the length dimension of the cold air purifying fluid 22 to create a long, narrow rectangular dust-capturing sheet 7. Here, when cutting the strip-shaped mesh sheet 3, the cutting position of the strip-shaped mesh sheet 3 may be determined by aligning the cold air purifying fluid 22 with the strip-shaped mesh sheet 3 to a length corresponding to the length of the cold air purifying fluid 22, or the cutting position of the strip-shaped mesh sheet 3 may be determined by measuring the length of the cold air purifying fluid 22 with a measuring instrument such as a convex rule and measuring the strip-shaped mesh sheet 3 to a length corresponding to that length. Furthermore, if multiple types of cold air purifying fluids 22 with different width dimensions are used in the store, a sheet roll 1 with a width corresponding to the width dimension of each cold air purifying fluid 22 is selected, and the dust-capturing sheet 7 is created using the selected sheet roll 1.

[0059] [Cold air rectifier installation process] Subsequently, as shown in Figures 6(c) and 7-10, the dust-catching sheet 7 is attached to the upper surface 24 of the cold air purifying fluid 22, and the cold air purifying fluid 22 is attached to the cold air outlet 14 of the refrigerated open showcase 10 shown in Figure 5.

[0060] The cold air purifying fluid 22 shown in Figures 7 to 10 is fitted with a mounting fixture 26 that serves as a handle for attaching and detaching the cold air purifying fluid 22 from the cold air outlet 14 (see Figure 5) of the refrigerated open display case 10. As shown in Figure 9, the mounting fixture 26 has a constricted portion 26a that extends in a U-shape along the top surface 24, front, and rear surfaces of the cold air purifying fluid 22 when viewed from the left and right directions, and a knob portion 26b formed at the lower end of the constricted portion 26a.

[0061] The dust-catching sheet 7 can be attached to the upper surface 24 of the cold air purifying fluid 22 as follows: First, the mounting bracket 26 is removed from the cold air purifying fluid 22. Next, the dust-catching sheet 7 is placed on the upper surface 24 of the cold air purifying fluid 22. Then, the mounting bracket 26 is fitted around the cold air purifying fluid 22 with the dust-catching sheet 7 in place. After that, the cold air purifying fluid 22 is fitted from below into the cold air outlet 14 of the refrigerated open showcase 10 shown in Figure 5.

[0062] Here, as an example of using the sheet raw material 1 shown in Figures 1 and 2, the process of attaching the dust-catching sheet 7 to the cold air purifying fluid 22 has been explained. However, the process of replacing a dust-catching sheet 7 that is already attached to the cold air purifying fluid 22 with a new dust-catching sheet 7 can be carried out in the same manner as described above.

[0063] As described above, using this sheet raw material 1, when attaching the dust-capturing sheets 7 shown in Figures 7 and 8 to the cold air purifying fluid 22 used in refrigerated open display cases 10 (see Figure 5) in stores such as supermarkets, or when replacing those dust-capturing sheets 7, as shown in Figures 6(a) to (c), a strip-shaped mesh sheet 3 can be pulled out from the sheet raw material 1 in the store, and the strip-shaped mesh sheet 3 can be cut to a length corresponding to the length of each cold air purifying fluid 22 removed from the refrigerated open display case 10, thereby creating a dust-capturing sheet 7 corresponding to each cold air purifying fluid 22. Therefore, it is not necessary to know the length dimensions of each cold air purifying fluid 22 used in the store in advance, and it is possible to easily match the dust-capturing sheets 7 with the cold air purifying fluid 22, making it easy to manage the dimensions of the dust-capturing sheets 7.

[0064] Furthermore, as shown in Figures 1 and 2, the sheet raw material 1, which is formed by winding a long strip of mesh sheet 3 into a roll, can be kept stable by securing the ends of the strip of mesh sheet 3 to the outer circumference of the sheet raw material 1 with adhesive tape 4 or rubber bands. Also, as shown in Figures 6(a) to (c), the dust-catching sheets 7 are created by pulling out the strip of mesh sheet 3 from the sheet raw material 1 and cutting the strip of mesh sheet 3. Therefore, the required number of dust-catching sheets 7 can be obtained at the required time, and there is no need to stack many dust-catching sheets 7. For this reason, it is easy to handle and highly practical.

[0065] Furthermore, since the sheet raw material 1 has a strip-shaped mesh sheet 3 with a length of 20m or more (preferably 30m or more, for example 50m), it is possible to create a large number of dust-capturing sheets 7 from one roll of sheet raw material 1. Therefore, after attaching the dust-capturing sheets 7 to the cold air conditioning fluid 22 in the store, or after replacing those dust-capturing sheets 7, the remaining sheet raw material 1 can be used for the next replacement of the dust-capturing sheets 7, making it economical.

[0066] Furthermore, if the cold air purifying fluid 22 used in the refrigerated open showcase 10 shown in Figure 5 is of a type without mounting fixtures 26 as shown in Figures 7 to 10, when placing the dust-catching sheet 7 on the upper surface 24 of the cold air purifying fluid 22 and fitting the cold air purifying fluid 22 into the cold air outlet 14 of the refrigerated open showcase 10 shown in Figure 5, there is a possibility that the dust-catching sheet 7 may come off the upper surface 24 of the cold air purifying fluid 22 or that the position of the dust-catching sheet 7 may shift. Therefore, for the type of cold air purifying fluid 22 without the mounting fixture 26, the dust-catching sheet 7 is placed on the top surface 24 of the cold air purifying fluid 22, and a rubber band (not shown) is wrapped around it to hold the dust-catching sheet 7 in place on the top surface 24 of the cold air purifying fluid 22. Next, the cold air purifying fluid 22 is fitted from below into the cold air outlet 14 of the refrigerated open showcase 10 shown in Figure 5. After that, the rubber band is cut on the underside of the cold air purifying fluid 22, and the rubber band is pulled downwards to remove it. This mounting method prevents the dust-catching sheet 7 from coming off the top surface 24 of the cold air purifying fluid 22 or from shifting position when the cold air purifying fluid 22 is fitted into the cold air outlet 14 of the refrigerated open showcase 10. In addition, since a general-purpose rubber band can be used, it is low cost. Furthermore, since the rubber band is removed after the cold air purifying fluid 22 is fitted into the cold air outlet 14, it is possible to prevent the aesthetic appearance of the cold air purifying fluid 22 from being spoiled by the rubber band. [Explanation of symbols]

[0067] 1. Dust-catching sheet raw material 3. Strip-shaped mesh sheet 5 Warp threads 6 weft threads 7. Dust-catching sheet 10 Refrigerated Open Display Cases 14 air vents 22 Cold air rectifying fluid

Claims

1. A sheet material for dust capture in the cold air conditioning fluid of a refrigerated open display case, formed by weaving synthetic resin warp threads (5) and weft threads (6) to form a grid-like mesh with a width of 10 cm or less and a length of 20 m or more, and then winding the long strip-shaped mesh sheet (3) having a width of 10 cm or less and a length of 20 m or more into a roll.

2. The raw material for a dust-capturing sheet for the cold air conditioning fluid of a refrigerated open display case according to claim 1, wherein the edges on both sides in the width direction of the strip-shaped mesh sheet (3) are prevented from fraying by applying heat and melting.

3. A sheet raw material preparation step is performed to prepare the dust-catching sheet raw material (1) described in claim 1 for a store where a refrigerated open display case (10) is installed, A step of removing the cold air conditioning fluid (22) from the cold air outlet (14) of the refrigerated open showcase (10) installed in the store, After the sheet raw material preparation step and the cold air conditioning fluid removal step, the strip mesh sheet (3) is pulled out from the dust-capturing sheet raw material (1) prepared in the store, and the strip mesh sheet (3) is cut to a length corresponding to the length of the cold air conditioning fluid (22) removed from the refrigerated open showcase (10) to create a long, narrow rectangular dust-capturing sheet (7), The process includes, after the sheet cutting step, attaching the dust-capturing sheet (7) to the upper surface (24) of the cold air conditioning fluid (22), and attaching the cold air conditioning fluid (22) to the cold air outlet (14) of the refrigerated open showcase (10), and then installing the cold air conditioning fluid. Instructions for using dust-catching sheet material.

4. In the sheet raw material preparation step, multiple types of dust-catching sheet raw materials (1) with different width dimensions are prepared. The method for using a dust-catching sheet raw material according to claim 3, wherein in the sheet cutting step, a dust-catching sheet raw material (1) having a width dimension corresponding to the width dimension of the cold air conditioning fluid (22) taken out from the refrigerated open showcase (10) is selected from among the plurality of types of dust-catching sheet raw materials (1), and the dust-catching sheet (7) is made using the selected dust-catching sheet raw material (1).

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