Packing case, and packing body

Abstract

To provide an easily handled packing case capable of stably holding a packed thin plate metal product.SOLUTION: A packing case 1 provided by integrally forming a lid part 10, a support part 20 identical in shape and size to the lid part, and a hinge part 30 connecting the lid part with the support part and openable / closable with the hinge part as a center comprises a buffer material 41 disposed between the lid part and the support part. A product of hardness of the buffer material represented by Newton unit and thickness of the buffer material represented by a millimeter unit is 950 or greater and 6500 or lower.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a packaging case, and more particularly to a packaging case suitable for packaging thin metal products.

Background Art

[0002] Among thin metal products, there are many with a thickness on the order of ten to several tens of μm. As thin metal products, light-shielding plates for camera modules and metal masks for controlling patterns and formation ranges of layers formed by vapor deposition or sputtering are known. The above-described thin metal products have many fine holes, and when an external force is applied, wrinkles are easily generated or the products are broken, making them unable to withstand use. Therefore, extreme care must be taken when transporting them.

[0003] Patent Document 1 discloses a packaging body applied to such a vapor deposition mask. This packaging body includes a receiving part and a lid part, and the vapor deposition mask is packaged so as to be sandwiched between the receiving part and the lid part. As one aspect, a mode in which the receiving part and the lid part are connected via a hinge part is also disclosed.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] In the packaging body according to Patent Document 1, when the receiving part and the lid part are connected via a hinge part, handling becomes convenient, but the behavior during packaging is significantly different from the case where the receiving part and the lid part are not connected. As will be described in detail later, the inventors have found that due to this difference in behavior, there is a high possibility that the vapor deposition mask packed may move within the package. And the present invention has been completed by solving this problem.

[0006] An object of the present invention is to provide a packaging case that is easy to handle and can stably hold a thin plate metal product packed therein.

Means for Solving the Problems

[0007] The first aspect of the present invention is a packaging case in which a lid portion, a support portion having the same shape and size as the lid portion, and a hinge portion connecting the lid portion and the support portion are integrally formed and can be opened and closed about the hinge portion. This packaging case has a cushioning material disposed between the lid portion and the support portion. The product of the hardness of the cushioning material expressed in units of Newton and the thickness of the cushioning material expressed in units of millimeter is 950 or more and 6500 or less.

[0008] The second aspect of the present invention is a package including the packaging case according to the first aspect and a thin plate metal product disposed between the lid portion and the support portion.

Effects of the Invention

[0009] The packaging case according to the present invention is easy to handle and can stably hold a thin plate metal product packed therein.

Brief Description of the Drawings

[0010]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiment for Carrying Out the Invention

[0011] A first embodiment of the present invention will be described with reference to FIGS. 1 to 4. FIG. 1 is a perspective view showing one form during use of the packing case 1 according to the present embodiment. The packing case has a basic structure in which an upper lid portion 10 and a lower support portion 20 are integrally connected by a hinge portion 30. When the thin plate metal product Tm to be packed is positioned between the lid portion 10 and the support portion 20 and fixed with a tape 2, a band, etc. so that the lid portion 10 and the support portion 20 do not separate, the packing of the thin plate metal product Tm into the packing case 1 is completed.

[0012] The thin plate metal product to be packed is a metal sheet having a thickness of less than 1 mm, typically about 10 μm to 100 μm, and has a large number of fine through shapes formed by etching. Therefore, not limited to the metal mask used in the vapor deposition process, a metal sheet having a large number of light shielding plates for smartphones removed from the metal sheet and used is also a suitable object. Examples of the material of the metal sheet include stainless steels such as SUS430 and SUS304, iron-nickel alloys such as Invar material, iron-nickel-cobalt alloys such as Super Invar material, beryllium copper, nickel-tin-copper, phosphor bronze, Corson alloy, copper alloys such as titanium copper, etc.

[0013] FIG. 2 shows the packing case 1 in an open state. The lid portion 10, the support portion 20, and the hinge portion 30 are formed of a single plate-like member, and by providing two grooves having a V-shaped cross section between the portion that becomes the lid portion 10 and the portion that becomes the support portion 20, a structure in which the lid portion 10 and the support portion 20 are integrally connected by the hinge portion 30 can be easily realized. As the material for forming the lid portion 10, the support portion 20, and the hinge portion 30, known plastic corrugated board (pradan) is suitable. Since pradan has a hollow structure or a honeycomb structure, the packaging case 1 formed of pradan is strong, excellent in impact resistance, and has both lightness and flexibility at the same time.

[0014] The lid portion 10 and the support portion 20 are generally the same shape and size, and their dimensions can be appropriately set in consideration of the dimensions of the thin plate metal product to be packaged. For example, it is a rectangle with a long side of 600 mm or more and 1300 mm or less, and a short side of 180 mm or more and 300 mm or less.

[0015] The hinge portion 30 can be provided on either the long side or the short side. From the viewpoints of packaging performance and usability (ease of opening and closing operation), it is preferably provided on the long side as shown in FIG. 2. The shape of the hinge portion 30 that defines the distance between the lid portion 10 and the support portion 20 in the state shown in FIG. 2 can be appropriately determined in consideration of the thickness direction dimension of the packaged object described later.

[0016] A bottomed concave portion 11 having a quadrangular shape smaller than the shape of the lid portion itself is formed in the lid portion 10. Since the bottomed concave portion 11 is intended to protect the region provided with the fine through shape among the thin plate metal products, its shape and dimensions may be set to be slightly larger than the range in which the fine through shape is provided in the thin plate metal product to be packaged.

[0017] At both ends in the extending direction of the hinge portion 30, buffer materials 41 that can be compression-deformed are respectively arranged. The buffer material 41 may be located between the lid portion 10 and the support portion 20 in the state where the packaging case 1 shown in FIG. 1 is closed, and may be fixed to the lid portion 10.

[0018] The buffer material is arranged so as to be located at least 90% or more, preferably 95% or more, more preferably 98% or more in the extending direction of the side (the short side in this embodiment) that forms a right angle with the hinge portion 30 among the four sides of the lid portion 10 and the support portion 20, and may be arranged throughout this direction. The cushioning material 41 of this embodiment has a main portion 41a extending substantially parallel to the short sides of the lid portion 10 and the support portion 20 (including complete parallelism, the same applies hereinafter), and two auxiliary portions 41b extending substantially parallel to the long sides of the lid portion 10 and the support portion 20 from both longitudinal ends of the main portion 41a.

[0019] The thin plate metal product Tm, which is the object, can be packed in the packing case 1 not only as a single sheet but also in a state where a plurality of sheets are stacked. Fig. 3 shows a schematic diagram of the packing state when a plurality of thin plate metal products Tm are packed. When packing a plurality of thin plate metal products Tm, the thin plate metal products Tm and the interleaving paper Ip are alternately stacked so that the interleaving paper Ip is always present between adjacent thin plate metal products Tm. The interleaving paper Ip suppresses the deformation of the thin plate metal product Tm and also has the effect of making the thin plate metal product Tm less likely to rust even in a high-humidity environment by absorbing moisture in the atmosphere. Dust-free paper is typical as the interleaving paper Ip, and other papers can also be used.

[0020] Furthermore, the stacked thin plate metal products Tm and the interleaving paper Ip are sandwiched from above and below in the thickness direction by a synthetic resin protective sheet Ps. The protective sheet Ps has the effect of preventing charging that causes foreign matter adhesion and suppressing charging inside the packing case 1. A suitable example of the protective sheet Ps is a sheet made of polyethylene terephthalate (PET) subjected to an antistatic treatment. The interleaving paper Ip and the protective sheet Ps are sized to be equal to or larger than the thin plate metal product Tm so as to cover the entire thin plate metal product Tm, but there is no particular limitation on the size relationship between the interleaving paper Ip and the protective sheet Ps.

[0021] The operation during use of the packing case 1 according to this embodiment configured as described above will be described. The user places the package including the thin plate metal product Tm prepared as described above on the support portion 20 and adjusts the position so that the entire range provided with the fine through shape is located within the range of the bottomed recess 11 when the packing case 1 is closed.

[0022] Subsequently, the buffer members 41 are positioned at both ends of the hinge portion 30 in the extending direction, and the lid portion 10 is moved with at least one of the protective sheet Ps and the interleaving paper Ip among the packaged items being sandwiched between the buffer member 41 and the support portion. The lid portion 10 rotates about the hinge portion 30 and approaches the packaged item from above the packaged item. The lid portion 10 further approaches the packaged item while compressing and deforming the buffer member 41, and eventually the lid portion 10 and the support portion 20 become substantially parallel. In this state, when the tape 2 is wound around the outer peripheral surface of the packaging case, this substantially parallel state is maintained and the packaging is completed.

[0023] In the state where the packaging is completed, a part of the packaged item is sandwiched and pressed between the buffer member 41 and the support portion 20, whereby the relative movement of the packaged item in the packaging case 1 is suppressed. At this time, although the thin plate metal product Tm is not sandwiched between the buffer member 41 and the support portion 20, since the surrounding protective sheet Ps and interleaving paper Ip are pressed and held, the relative movement in the packaging case 1 is suppressed while not being directly pressed. Furthermore, since the entire range provided with the fine through shape among the packaged items is located within the range of the bottomed recess 11, the state where the range provided with the fine through shape does not come into contact with the lid portion 10 is maintained. Thereby, it is suitably suppressed that the range provided with the fine through shape is damaged by the friction between the packaged item and the lid portion 10 during transportation or the like.

[0024] As described above, when closing the packaging case 1, the buffer member 41 is compressed, resulting in a stable packaging state. Here, the inventors have found from many studies that the stability of the packaging state varies depending on the material and dimensions of the buffer member 41.

[0025] In a structure in which a lid portion and a support portion are connected by a hinge portion like the packaging case 1, when closing the lid portion, a larger pressure is likely to be generated on the side closer to the hinge portion, and it becomes difficult to hold the side farthest from the hinge portion with sufficient force. In such a structure, when a buffer member is disposed between the lid portion and the hinge portion, the buffer member is compressed when closing the lid portion, thereby having the effect of relaxing this pressure difference and approaching a uniform state.

[0026] However, when the cushioning material is hard and difficult to compress and deform, the lid portion cannot be in a state substantially parallel to the support portion. As a result, a phenomenon occurs in which the lid portion is curved and the intermediate portion between the side close to the hinge portion and the side far from the hinge portion is not sufficiently pressed. On the other hand, when the cushioning material is made easy to compress and deform, the cushioning material is completely compressed before the lid portion sufficiently approaches the side farthest from the hinge portion, and a phenomenon occurs in which the effect of the cushioning material is not sufficiently exhibited.

[0027] Based on the above findings, the inventors further studied and found that by setting the thickness dimension in consideration of the hardness of the cushioning material, the pressure difference between the side close to the hinge portion and the side far from the hinge portion is reduced, and the package containing the thin plate metal product Tm is suppressed from moving within the packing case 1 during storage, transportation, etc. That is, by setting the hardness and thickness of the cushioning material so that the compression deformation of the cushioning material is completed at the timing when the lid portion sufficiently approaches the side farthest from the hinge portion, it was found that the package containing the thin plate metal product can be packed in a stable state, and the package containing the thin plate metal product Tm can be suppressed from moving within the packing case 1 during storage, transportation, etc.

[0028] Although details will be shown in experimental examples later, it was found that by setting the value of the product of the hardness (Newton, N) and thickness (mm) of the cushioning material 41 to a value of 950 or more and 6500 or less, the package can be satisfactorily held in the packing case.

[0029] As the hardness of the cushioning material, in the present invention, a value obtained by measurement conforming to JIS K 6400-2 A is used. This is a standard widely used for evaluating members that undergo compression deformation such as cushions and mattresses.

[0030] In the packing case 1 according to the present embodiment, the thickness and hardness are set so that the cushioning material 41 has the above-described product value. As a result, the thickness of the cushioning material 41 becomes extremely small at a timing very close to the timing when the lid portion 10 sufficiently approaches the side farthest from the hinge portion 30 and the lid portion 10 and the support portion 20 become substantially parallel.

[0031] As a result, the difference in the force pressing the package on the side closer to and farther from the hinge portion 30 is reduced, and the package containing the thin plate metal product Tm is preferably suppressed from moving within the packing case 1 during storage, transportation, etc. This exerts an effect of sufficiently suppressing the occurrence of wrinkles, deformation, etc. in the thin plate metal product Tm contained in the package, or the adhesion of foreign matters derived from the spacer paper Ip to the thin plate metal product Tm due to the relative movement and rubbing between the thin plate metal product Tm and the spacer paper Ip.

[0032] Regarding the packing case according to the present embodiment, the scope of the technical idea according to the present invention described in more detail using experimental examples is not limited based only on the specific numerical values in each experimental example.

[0033] (Preparation of cushioning material) The following two types were used as the material, and a plurality of types with different hardnesses were prepared. The hardness values measured in accordance with JIS K 6400-2 A are shown in ( ). · Sponge made of polyurethane (100N, 120N, 1250N) · Expanded polyethylene (5000N, 14000N, 47500N)

[0034] (Preparation of lid portion, support portion, and hinge portion) Using a pradane, the following three types with different plan view dimensions of the lid portion and the support portion were produced. The hinge portion was provided along the long sides of the lid portion and the support portion in any size, and the distance between the lid portion and the support portion in a state where the lid portion 10 and the support portion 20 bent so as to form a substantially right angle with respect to the hinge portion 30 were parallel was set to 5 mm as shown in the cross-sectional view of FIG. 4. Note that the most force is applied near the hinge portion when packing the thin plate metal product Tm. · Size 1: 180 mm × 600 mm · Size 2: 180 mm × 1300 mm The plan view shape of the cushioning material was made into a U shape shown in FIG. 2. The dimensions are as follows. Main part: A rectangle with a long side of 170 mm and a short side of 40 mm Auxiliary part: A rectangle with a long side of 130 mm and a short side of 34 mm The main part is connected to the short side of the auxiliary part within a range of 34 mm from both ends. For the size 1 of the bottomed recess, the dimensions are 90 mm × 450 mm, and for the size 2, it is 90 mm × 1050 mm at the central part of the lid, and both are provided at the central part of the lid. · Size 3: 290 mm × 1300 mm The planar shape of the cushioning material is a U-shape similar to that of sizes 1 and 2, and the dimensions are as follows. Main part: A rectangle with a long side of 290 mm and a short side of 70 mm Auxiliary part: A rectangle with a long side of 220 mm and a short side of 58 mm The main part is connected to the short side of the auxiliary part within a range of 58 mm from both ends. The dimensions of the bottomed recess are 160 mm × 1000 mm and it is provided at the central part of the lid.

[0035] (Preparation of the package) As the thin metal product Tm, a metal sheet (thickness: 25 μm) made of stainless steel (SUS430) on which a large number of light-shielding plates for camera modules with a diameter of 2.5 mm and through-holes with a diameter of 500 μm formed by etching were used. A plurality of these metal sheets and separator papers were alternately stacked and sandwiched from both sides in the thickness direction with a PET protective sheet to produce a package. Two types of package thicknesses (heights), 1 mm and 5 mm, were prepared.

[0036] Using the above, the evaluation was conducted as follows. (Pressure measurement) A package with a thickness of 5 mm was placed on the support part, and the cushioning material was arranged so as to sandwich the protective sheet and the separator paper on both sides in the long side direction of the support part. The sensor of the pressure measurement device was arranged on the main part of the cushioning material. After that, with the lid approaching the support part and made substantially parallel, the tape was wound around three times at positions 150 mm from both ends in the longitudinal direction of the packaging case to complete the packaging. In this state, the pressure applied to the cushioning material was measured. The measuring devices used are as follows. Surface pressure distribution measurement system i-SCAN (Nitta Corporation) Using Sensor Sheet: I-SCAN210(R) Since the measurement resolution of the sensor sheet is 5.4 mm, for Size 1 and Size 2, the pressure was measured for each 34-mm range obtained by dividing the buffer material into five equal parts in the short side direction of the support part, and for Size 3, the pressure was measured for each 58-mm range obtained by dividing the buffer material into five equal parts in the short side direction of the support part. The pressure of each part was converted with the pressure in the range closest to the hinge part as 1. Similar measurements were made using a 1-mm-thick package, but since the measured values were equivalent to those for the 5-mm-thick case, the measured values for the 5-mm-thick package are shown in the table presented later.

[0037] (Position Shift Test) The packaged case after packaging was dropped from a position 75 cm above the floor surface, and the amount of movement (in the short side direction and long side direction of the packaged case) from the position during packaging of the thin plate metal product Tm (marked in advance) was measured. Since multiple thin plate metal products Tm were packaged, the average value of 10 randomly selected ones was adopted. The dropping modes were two types: a horizontal state and an inclined state with one of the long side directions lowered, and each was performed once. The maximum amount of movement in the two tests was adopted as the amount of deviation of the sample. The evaluation of the amount of deviation was in the following two levels, and ○ was regarded as passing. The boundary of each evaluation was determined based on the relationship between the amount of deviation preliminarily obtained and the number of foreign substances attached to the thin plate metal product. The amount of foreign substances in the cases of ○ and × was 2.5 or less and more than 2.5, respectively, around 90 cm 2 ○ (GOOD): The amount of deviation is 2 mm or less × (BAD): The amount of deviation exceeds 4 mm The above was performed for packages with thicknesses of 1 mm and 5 mm, respectively. The results for Size 1 and 2 are shown in Table 1, and the results for Size 3 are shown in Table 2, respectively. The pressure values at four locations away from the hinge part are shown as ratios with the value in the range closest to the hinge part as 1.

[0038]

Table 1

[0039] [Table 2]

[0040] As shown in Table 1 and Table 2, in Experimental Examples 4 to 9 and Experimental Examples 20 to 25 where the product of the hardness and the thickness A×B is 950 or more and 6500 or less, regardless of the size of the packing case, the displacement of the packed thin metal product was preferably suppressed. Here, for example, in Experimental Examples 1 to 3, although the same hardness cushioning material as in Experimental Examples 4 to 6 was used, the displacement could not be sufficiently suppressed. From this, it was strongly suggested that for the cushioning material, it is necessary to set considering both the hardness and the thickness. In Experimental Examples 1 to 3 and 17 to 19 where the value of A×B was insufficient, the pressure value at the part closest to the hinge part was small. Therefore, although the five pressures were equal, it was considered that displacement occurred because the pressing force itself was insufficient.

[0041] As described above, each embodiment of the present invention has been described. However, the specific configuration is not limited to this embodiment, and configurations such as changes and combinations within the scope not departing from the gist of the present invention are also included.

[0042] For example, the planar shape of the cushioning material is not limited to the U shape shown in the embodiment. To show some examples, it may be a frame shape with an auxiliary part connected like the cushioning material 41A of the modified example shown in FIG. 5, or it may be composed only of the main part without an auxiliary part like the cushioning material 41B of the modified example shown in FIG. 6. Alternatively, it may be formed in a curved shape like a C shape, and the mode where the distinction between the main part and the auxiliary part is not clear may be acceptable.

[0043] Also, the mode of the hinge part is not limited to that shown in the embodiment. In the embodiment, an example of a hinge part having two V-grooves opened on the side where the packaged object is accommodated was shown. Instead of this, a hinge part having one V-groove opened on the outside of the case may be provided.

Explanation of Signs

[0044] 1 Packaging case 10 Lid part 20 Support part 30 Hinge part 41, 41A, 41B Cushioning material

Claims

1. A packaging case in which a lid portion, a support portion having the same shape and size as the lid portion, and a hinge portion connecting the lid portion and the support portion are integrally formed, and which can be opened and closed about the hinge portion, having a cushioning material disposed between the lid portion and the support portion, wherein the product of the hardness of the cushioning material expressed in units of Newton and the thickness of the cushioning material expressed in units of millimeter is 950 or more and 6500 or less, the packaging case.

2. The planar shape of the lid portion and the support portion is rectangular, and the hinge portion is provided along the long side of the rectangle, The packaging case according to Claim 1.

3. The length of the long side is 600 mm or more and 1300 mm or less, The packaging case according to Claim 2.

4. The length of the short side of the rectangle is 180 mm or more and 300 mm or less, The packaging case according to Claim 2.

5. The hardness of the cushioning material expressed in units of Newton is 100 or more and 1250 or less, The packaging case according to Claim 1.

6. A packaging case according to any one of Claims 1 to 5, and a thin metal product disposed between the lid portion and the support portion, comprising: a packaged body.

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