Tubular cover and method for manufacturing tubular cover

Abstract

To provide a tubular cover that has a strength capable of handling easily, easy to remove when stacked, and can prevent shape deformation.SOLUTION: The present invention is a tubular cover 1 attached to a container for mushroom cultivation, comprising a tubular side wall portion 2 and an annular elastic ring 3 protruding toward the outside of the side wall portion 2, the elastic ring 3 being provided on at least one of the upper end and the lower end of the side wall portion 2. Since the elastic ring 3 provides elastic force to the tubular cover 1 against deformation in the radial direction R, the strength of the tubular cover 1 is improved, the handleability is improved, and shape deformation is prevented.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a cylindrical cover to be attached to a container for cultivating mushrooms. [Background technology]

[0002] Conventionally, when cultivating mushrooms on a fungus bed using a cultivation container, a cylindrical cover is attached to the bottle mouth of the cultivation container to guide the upward growth of the fruiting bodies of the mushrooms in an upright state. When the cultivation of the mushrooms is completed, the cylindrical cover is removed from the cultivation container, washed, and stored for repeated use. Since the cylindrical cover has an inverted truncated cone shape that decreases in diameter from the top to the bottom, the lower part of one cylindrical cover is inserted from the top of another cylindrical cover to stack multiple cylindrical covers, thereby reducing the space required for storage. Therefore, when using a cylindrical cover, it is necessary to remove one of the multiple stacked cylindrical covers, but the cylindrical cover itself is soft, making it difficult to control the force used to grip the cylindrical cover, and the stacked cylindrical covers may adhere to each other, making it difficult to remove them, and there is a demand for a cylindrical cover that is easy to remove.

[0003] Patent Document 1 proposes a mushroom cultivation cover that is attached to a cultivation jar for cultivating mushrooms to grow them in an aligned state, the mushroom cultivation cover being composed of a cylindrical body formed by overlapping two opposing ends of a sheet body formed in a band shape from a resin material and welding the ends together, and the mushroom cultivation cover is formed on the cylindrical body with a protrusion that protrudes on at least one of the outside and inside of the cylindrical body. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2011-103776 A Summary of the Invention [Problem to be solved by the invention]

[0005] However, the mushroom cultivation cover of Patent Document 1 is still difficult to grasp because the strength of the cover itself has not been improved, and there is a problem with the ease of removal. Currently, in many cases, the handling of cylindrical covers is performed manually by workers, but in order to realize automation using robots, etc., it is preferable that the cover be easily grasped. Furthermore, if the cylindrical cover is soft (low strength), there is also the problem of deformation of the shape due to repeated use.

[0006] The present invention has been made in response to the above-mentioned problems, and aims to provide a tubular cover that is strong enough to be easily handled, easy to remove when stacked, and capable of preventing deformation of the shape. [Means for solving the problem]

[0007] The present invention is a cylindrical resin cover to be attached to a mushroom cultivation container, comprising a cylindrical side wall portion and an annular elastic ring protruding toward the outside of the side wall portion, the elastic ring being provided on at least one of the upper and lower ends of the side wall portion.

[0008] According to this configuration, the elastic ring provided at least on one of the upper end and the lower end of the side wall portion imparts a resilient force against radial deformation to the cylindrical cover, making it easier to grasp the cylindrical cover. This is because the resilient force is larger and the amount of radial deformation can be reduced compared to a cylindrical cover without an elastic ring. When an elastic ring is provided at the upper end of the cylindrical cover, the operator's finger or a robot hand can be hooked on the elastic ring, making it easier to remove one cylindrical cover from a plurality of stacked cylindrical covers. When an elastic ring is provided at the lower end of the cylindrical cover, the elastic ring prevents the stacked cylindrical covers from sticking together, making it easier to remove one cylindrical cover from a plurality of stacked cylindrical covers. When elastic rings are provided at both the upper and lower ends of the cylindrical cover, it is possible to achieve both the effect of providing the elastic ring at the upper end of the cylindrical cover and the effect of providing the elastic ring at the lower end, making it easier to remove one cylindrical cover from a plurality of stacked cylindrical covers. In addition, the strength of the cylindrical cover is improved by the elastic ring, so that deformation of the cylindrical cover can be prevented. The elastic ring is preferably a fused part that is integral with the side wall part. The material of the cylindrical cover is not limited as long as it can impart a radial elastic force to the cylindrical cover by providing the elastic ring, and examples of the material include polypropylene (PP), high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), etc. "Cylindrical" means a shape that is substantially cylindrical, and may include, for example, one or both ends that are elliptical or oval, or a tapered shape with both ends having different sizes.

[0009] In the present invention, it is preferable that at least one of the outer surface and the inner surface of the side wall portion is provided with unevenness. According to this configuration, the unevenness can further prevent the stacked cylindrical covers from sticking to each other. Furthermore, the unevenness can improve the drainage performance of the cylindrical covers, so that the drying process after washing can be efficiently performed.

[0010] In the present invention, it is preferable that the projections and recesses are provided continuously in a specific pattern. With this configuration, the water drainage performance of the tubular cover can be further improved. Examples of the specific pattern include a lattice pattern, a houndstooth pattern, and patterns similar thereto.

[0011] In the present invention, the ratio of the thickness of the elastic ring to the thickness of the side wall portion in the radial direction is preferably 2 to 9, more preferably 3 to 7, and particularly preferably 4 to 6. With this configuration, it is possible to improve the ease of handling and realize sufficient strength to prevent deformation.

[0012] In the present invention, the thickness of the elastic ring in the radial direction is preferably 0.9 mm to 2 mm, more preferably 1.2 mm to 1.7 mm, and particularly preferably 1.2 mm to 1.4 mm. This configuration can impart sufficient strength to the cylindrical cover. When an elastic ring is provided at the upper end of the cylindrical cover within the above thickness range, a sufficient thickness is obtained for hooking the finger of an operator or a robot hand on the elastic ring. When an elastic ring is provided at the lower end of the cylindrical cover within the above thickness range, it is possible to prevent the stacked cylindrical covers from sticking to each other and to suppress the bulkiness caused by stacking.

[0013] In the present invention, the thickness of the elastic ring in the axial direction is preferably 0.7 mm to 1.6 mm, more preferably 0.9 mm to 1.4 mm, and particularly preferably 1.2 mm to 1.4 mm. This configuration can improve the ease of handling and achieve sufficient strength to prevent deformation.

[0014] In the present invention, the thickness of the side wall in the radial direction is preferably 0.24 mm to 0.35 mm, more preferably 0.27 mm to 0.33 mm, and particularly preferably 0.29 mm to 0.31 mm. With this configuration, it is possible to achieve both strength of the side wall and production costs.

[0015] The present invention is a method for manufacturing a tubular cover made of thermoplastic resin to be attached to a container for growing mushrooms, comprising a welding process in which two opposing ends of a thermoplastic resin sheet material are overlapped and welded to form a tubular body from the sheet material, and an elastic ring forming process in which an annular elastic ring protruding toward the outside of the tubular body is formed on at least one of the upper and lower ends of the tubular body.

[0016] According to this configuration, a cylindrical cover having an elastic ring formed on at least one of the upper and lower ends of the cylindrical side wall portion can be manufactured from a resin sheet material. For the reasons described above, the manufactured cylindrical cover has strength that makes it easy to handle, allows one cylindrical cover to be easily removed from a plurality of stacked cylindrical covers, and prevents deformation of the shape. The material of the sheet material is not limited as long as it can provide a radial elastic force to the cylindrical cover by providing the elastic ring, and examples of the material include polypropylene, high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), etc.

[0017] In the present invention, it is preferable that the sheet material has irregularities on one or both sides thereof. According to this configuration, a cylindrical cover having irregularities on at least one of the outer and inner surfaces of the side wall portion can be manufactured, so that the unevenness can further prevent the stacked cylindrical covers from sticking to each other.

[0018] The present invention preferably includes a shaping step of inserting a shaping member into the inside of the cylindrical body to shape it. According to this configuration, the cylindrical cover is expanded in the radial direction by the shaping member, so that the individual differences in the shape of the manufactured cylindrical cover can be reduced and the quality can be stabilized. Furthermore, the appearance can be improved by shaping. When a mold body having an inverted truncated cone shape is used as the shaping member, the roundness of both ends of the cylindrical cover can be improved.

[0019] In the present invention, it is preferable that the elastic ring forming step is a step of forming the elastic ring by subjecting at least one of the upper end and the lower end of the cylindrical body to a thermal melting treatment. With this configuration, the elastic ring can be easily formed. Effect of the Invention

[0020] The tubular cover of the present invention has an elastic ring on at least one of the upper and lower ends, which makes it strong enough to be easily handled, makes it easy to remove when stacked, and prevents deformation of the shape. [Brief description of the drawings]

[0021] [Figure 1] FIG. 2 is a perspective view of a cylindrical cover according to an embodiment of the present invention. [Diagram 2] FIG. [Diagram 3] FIG. 3 is a partial cross-sectional view taken along line III-III of FIG. 2. [Figure 4] FIG. 2 is a front view showing a cylindrical cover according to an embodiment of the present invention in a state where multiple covers are stacked. [Diagram 5] FIG. 4 is a front view showing the cylindrical cover in use. [Figure 6] FIG. 11 is a front view showing a modified example of the cylindrical cover according to the embodiment of the present invention. [Figure 7] FIG. [Figure 8] 4A to 4C are process diagrams of a method for manufacturing a cylindrical cover according to an embodiment of the present invention. [Figure 9] 4 is a perspective view showing a step of forming projections and recesses in the manufacturing method of the cylindrical cover according to the embodiment of the present invention. FIG. [Figure 10] FIG. [Figure 11] FIG. 11 is a front view showing the upper elastic ring forming step according to the first embodiment. [Figure 12] FIG. [Figure 13] FIG. 11 is a front view showing the lower elastic ring forming step according to the first embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] [Cylindrical cover] The resin cylindrical cover to be attached to the mushroom cultivation container of this embodiment will be described with reference to Figs. 1 to 7. The cylindrical cover 1 has a cylindrical side wall 2 with circular openings at both ends, a diameter decreasing from the upper end to the lower end, and a hollow inverted truncated cone shape, i.e., a tapered cylindrical side wall 2, and an annular elastic ring 3 protruding toward the outside of the side wall 2 (the radial direction R of the cylindrical cover 1), and the elastic ring 3 is provided at both ends (upper end and lower end) of the side wall 2 (see Figs. 1 to 3). The lower end of one cylindrical cover 1 can be inserted from the upper end of another cylindrical cover 1 to create a stacked state (see Fig. 4). The elastic rings 3 at both ends of the cylindrical cover 1 give the cylindrical cover 1 strength suitable for gripping, so that the worker can easily grip it, and the cylindrical cover 1 has excellent handleability. The cylindrical cover 1 is blue and transparent and has translucency, but is not limited to this and may be other colors. The material of the cylindrical cover 1 is not limited as long as it can impart a resilient force in the radial direction R to the cylindrical cover by providing the elastic ring 3, and examples thereof include polypropylene (PP), high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), etc. The dimensions of the cylindrical cover 1 can be appropriately changed depending on the shape of the mushroom cultivation container used, the type of mushroom to be cultivated, the cultivation environment, etc., and an example thereof is one having a height of 12 cm, an inner diameter at the upper end of 8.5 cm, and an inner diameter at the lower end of 7.5 cm, but is not limited thereto. The cylindrical cover 1 of this embodiment is provided with the elastic rings 3 at both the upper end and the lower end, but may be configured to have the elastic ring 3 at only one of the upper end and the lower end.

[0023] The side wall 2 is formed into a cylindrical shape by overlapping opposite ends of a resin sheet material and ultrasonically welding them together, and has a welding portion 21 provided with a plurality of welding points 21a. As shown in Fig. 1, the cylindrical cover 1 of this embodiment has the welding points 21a arranged in three rows along the axial direction Z in the welding portion 21, but is not limited to this as long as it has a bonding strength that can maintain the shape even when the cylindrical cover 1 is used repeatedly. The welding method is not limited to this, and a known welding method, for example, heat welding, can also be used.

[0024] The thickness T2 of the side wall 2 is preferably 0.24 mm to 0.35 mm, more preferably 0.27 mm to 0.33 mm, and particularly preferably 0.29 mm to 0.31 mm. Within this range, sufficient strength and economic efficiency can be achieved at the same time.

[0025] The side wall portion 2 is provided with a plurality of circular through-holes 22. The through-holes 22 are provided for the breathing of the cultivated mushrooms, and prevent a decrease in the oxygen concentration inside the cylindrical cover 1. In addition, they also prevent the stacked cylindrical covers 1 from sticking together. The shape of the through-holes 22 is not particularly limited, and a rectangular, polygonal, elliptical, oblong, or other shape may be adopted. The size and number of the through-holes 22 are not particularly limited as long as the strength of the cylindrical cover 1 to be able to stand on its own is not impaired.

[0026] The elastic rings 3 are annular members located at both ends of the side wall portion 2, and are composed of an upper elastic ring 31 at the upper end and a lower elastic ring 32 at the lower end. The elastic rings 3 impart a resilient force to the cylindrical cover 1 against deformation in the radial direction R, improving the strength of the cylindrical cover 1, making it easier to grip, and preventing deformation. By providing the upper elastic ring 31, when removing one cylindrical cover 1 from a plurality of stacked cylindrical covers 1, the operator's finger or a robot hand can be hooked on the upper elastic ring 31 of the cylindrical cover 1 to be removed, making the removal operation easier (see FIG. 4). By providing the lower elastic ring 32, it is possible to prevent the cylindrical covers 1 from sticking to each other when multiple cylindrical covers 1 are stacked, making it easier to remove one cylindrical cover 1 from multiple stacked cylindrical covers 1.

[0027] The inner surface 3a of the elastic ring 3 is smoothly connected to the inner surface 2a of the side wall portion 2 (see FIG. 3). The thickness T3 of the elastic ring 3 in the radial direction R of the cylindrical cover 1 is not particularly limited as long as the lower end of one cylindrical cover 1 can be inserted from the upper end of another cylindrical cover 1, that is, multiple cylindrical covers 1 can be stacked, but is preferably 0.9 mm to 2 mm, more preferably 1.2 mm to 1.7 mm, and particularly preferably 1.2 mm to 1.4 mm. Within this range, it is possible to prevent the stacked cylindrical covers from sticking to each other and to suppress the bulkiness due to stacking. The thickness H3 of the elastic ring 3 in the axial direction Z of the cylindrical cover 1 is preferably 0.7 mm to 1.6 mm, more preferably 0.9 mm to 1.4 mm, and particularly preferably 1.2 mm to 1.4 mm. Within this range, it is possible to achieve both sufficient strength and economic efficiency. Depending on the conditions of use, the thickness T3 of the elastic ring 3 in the radial direction R and / or the thickness H3 in the axial direction Z may be different between the upper elastic ring 31 and the lower elastic ring 32. The ratio of the thickness T3 of the elastic ring 3 to the thickness T2 of the side wall portion 2 in the radial direction R is preferably 2 to 9, more preferably 3 to 7, and particularly preferably 4 to 6. Within this range, it is possible to improve the ease of handling and realize sufficient strength to prevent deformation.

[0028] A method of using the cylindrical cover 1 will be described. One cylindrical cover 1 is removed from the stacked cylindrical covers 1 (see FIG. 4). The lower end of the removed cylindrical cover 1 is placed over the bottle mouth 41 of the mushroom cultivation container 4 (see FIG. 5). Mushrooms M are cultivated in the mushroom cultivation container 4 to which the cylindrical cover 1 is attached. When the cultivation is completed, the cylindrical cover 1 is grasped together with the mushrooms M located inside, and the cylindrical cover 1 and the mushrooms M are separated from the mushroom cultivation container 4. The mushrooms M are removed from the cylindrical cover 1, and the mushrooms M and the cylindrical cover 1 are separated. The separated cylindrical cover 1 is washed. A plurality of cylindrical covers 1 are stacked, stored, and dried. The dried cylindrical cover 1 is attached to another mushroom cultivation container 4 and used repeatedly. In this series of uses, the cylindrical cover 1 has a strength suitable for gripping due to the elastic ring 3 of the cylindrical cover 1, so that it can be easily gripped and has excellent handling properties. The cylindrical cover 1 can be easily grasped not only by the hands of an operator but also by a machine such as a robot hand, and is therefore suitable for automating operations.

[0029] <Modification> 6 and 7 show modified examples of the cylindrical cover of this embodiment in which convex portions are provided on the inner surface 2a and the outer surface 2b of the side wall portion 2. The cylindrical cover 101 shown in FIG. 6 is one modified example of this embodiment. The cylindrical cover 101 has approximately circular convex portions 123 irregularly provided on the inner surface 2a and the outer surface 2b of the side wall portion 2. The convex portions 123 prevent the stacked cylindrical covers 101 from sticking together, and improve the drainage performance when washing the cylindrical covers 101. Furthermore, the convex portions 123 increase the frictional force with the side wall portion 2 when the cylindrical cover 101 is gripped, so that it also exerts an anti-slip effect. The cylindrical cover 201 shown in FIG. 7 is another modified example of this embodiment. The cylindrical cover 201 has approximately circular convex portions 223a provided continuously in a specific pattern on the inner surface 2a of the side wall portion 2, and has linear convex portions 223b provided continuously in a specific pattern on the outer surface 2b. The cylindrical cover 201 having such convex portions 223a, 223b has the same effect as the convex portion 123 of the cylindrical cover 101. In the above two modified examples, the convex portions are provided on both the inner surface 2a and the outer surface 2b of the side wall portion 2, but this is not limited to this. The convex portions may be provided on only one of the inner surface 2a or the outer surface 2b, and may be arranged irregularly or regularly. The shape of the convex portions is not limited, and may be, for example, rectangular or polygonal. Furthermore, concave portions may be provided instead of the convex portions.

[0030] When a convex portion is provided on the inner surface 2a, the height of the convex portion is preferably 0.01 mm to 0.2 mm. When a concave portion is provided on the inner surface 2a, the depression of the depression is preferably 0.01 mm to 0.2 mm. If the height of the convex portion provided on the inner surface 2a and the depression of the depression are within this range, the humidity inside the cylindrical cover during mushroom cultivation can be maintained at an appropriate value, and the mushrooms can be prevented from being damaged when the cylindrical cover is removed at the end of cultivation. When a convex portion is provided on the outer surface 2b, the height of the convex portion is preferably 0.01 mm to 0.2 mm. If the height of the convex portion provided on the outer surface 2b and the depression of the depression are within this range, sufficient water drainage and appropriate frictional force can be achieved at the same time.

[0031] When the convex portions or concave portions are irregularly arranged, the distance between the convex portions or concave portions is preferably 0.5 mm to 1.5 mm on the inner surface 2a and 2 mm to 4 mm on the outer surface 2b. When the convex portions or concave portions are regularly arranged, the distance between the convex portions or concave portions is preferably 0.5 mm to 1.5 mm on the inner surface 2a and 2 mm to 4 mm on the outer surface 2b.

[0032] The cylindrical cover 1 of this embodiment has the following effects. The provision of the elastic ring 3 makes it easy to grip and prevents deformation. When removing one cylindrical cover 1 from a plurality of stacked cylindrical covers 1, the upper elastic ring 31 of the cylindrical cover 1 to be removed can be hooked with a finger or the like, making the removal operation easy. When a plurality of cylindrical covers 1 are stacked, the through-holes 22 of the side wall portion 2 and the lower elastic ring 32 prevent the cylindrical covers 1 from sticking together, making the removal operation easy. When the cylindrical cover has a convex portion and / or a concave portion on the side wall portion 2, the cylindrical covers can be more effectively prevented from sticking together.

[0033] [Manufacturing method of the cylindrical cover] A method for manufacturing a cylindrical cover made of thermoplastic resin to be attached to a mushroom cultivation container will be described with reference to Figs. 8 to 13. The method for manufacturing a cylindrical cover of this embodiment includes an unevenness forming step S1, a cutting out step S2, a welding step S3, an upper elastic ring forming step S4, a shaping step S5, and a lower elastic ring forming step S6 (see Fig. 8), and is a method for manufacturing a cylindrical cover 101 of the above modification having a convex portion 123 on the inner surface 2a and the outer surface 2b of the side wall portion 2 from a long thermoplastic resin sheet 5 wound in a roll shape. When manufacturing a cylindrical cover 1 without a convex portion on the side wall portion 2, the unevenness forming step S1 is omitted. The method for manufacturing a cylindrical cover of this embodiment includes both an upper elastic ring forming step S4 and a lower elastic ring forming step S6 as elastic ring forming steps, so that a cylindrical cover having elastic rings 3 at both the upper end and the lower end can be manufactured, but is not limited thereto. The manufacturing method of the cylindrical cover of the present invention may include at least one of the upper elastic ring forming step S4 and the lower elastic ring forming step S6 as the elastic ring forming step, thereby manufacturing a cylindrical cover having an elastic ring 3 at at least one of the upper end and the lower end. The resin sheet is blue and transparent and has translucency, but is not limited to this and may be other colors. The material of the resin sheet is not limited as long as it can impart radial elastic force to the cylindrical cover to be manufactured by providing the elastic ring, and examples of the material include polypropylene, high density polyethylene (HDPE), low density polyethylene (LDPE), linear low density polyethylene (LLDPE), etc.

[0034] The unevenness forming step S1 is a step of forming unevenness 5a on one or both sides of a long thermoplastic resin sheet 5 wound in a roll shape. The heated resin sheet 5 is passed between a pair of unevenness forming rollers 10, and unevenness 5a is formed on the surface of the resin sheet 5 according to the shape of the roller surface 10a of each unevenness forming roller 10 (see FIG. 9). The unevenness 5a formed in this step is a convex portion or a concave portion provided on the side wall portion of the cylindrical cover. The shape of the roller surface 10a can be changed to change the shape of the unevenness 5a formed on the resin sheet 5. Therefore, it is also possible to manufacture a cylindrical cover 201 having substantially circular convex portions 223a continuously provided in a specific pattern on the inner surface 2a of the side wall portion 2, and having linear convex portions 223b continuously provided in a specific pattern on the outer surface 2b. When manufacturing a cylindrical cover 1 without convex portions or concave portions, the unevenness forming step S1 is omitted.

[0035] The cutting out step S2 is a step of cutting out a sheet material 6 of a size suitable for forming a cylindrical cover 101 from the resin sheet 5 having the irregularities 5a formed on one or both sides after the irregularity forming step S1, and further providing through holes 22 in the sheet material 6. This step makes it possible to form a sheet material 6 having the irregularities 5a on one or both sides and provided with the through holes 22. The cutting out step S2 can be performed by a known sheet processing method such as a method of cutting and punching the resin sheet 5 using a press machine (not shown), and therefore a detailed description thereof will be omitted here.

[0036] The welding step S3 is a step of overlapping and welding two opposing ends 61, 61 of the sheet material 6 to form a cylindrical body 7 from the sheet material 6. First, the sheet material 6 is placed between the outer mold 11a and the inner mold 11b by using a cylindrical body 11 consisting of a pair of outer molds 11a and an inner mold 11b located in the center, with the two opposing ends 61, 61 overlapping (see Figs. 10(a) and 10(b)). Then, the horn 12 that transmits ultrasonic waves is brought into contact with the overlapping position of the ends 61 for ultrasonic welding (see Fig. 10(c)), and the cylindrical body 7 having the welded portion 21 is formed (see Fig. 10(d)). By using ultrasonic welding, only specific parts can be quickly welded, so that production efficiency is high. In this embodiment, ultrasonic welding is used to form the cylindrical body 7, but this is not limited thereto, and known welding methods such as heat welding can also be adopted.

[0037] The upper elastic ring forming step S4 is a step of forming the upper elastic ring 31, which is an annular ring body protruding toward the outside of the cylindrical body 7, at the upper end of the cylindrical body 7. The cylindrical body 7 is fixed by the holder 13 (see FIG. 11(a)), and the heated metal plate 14 is pressed against the upper end of the cylindrical body 7 to melt (see FIG. 11(b)), thereby forming the annular upper elastic ring 31 protruding toward the outside of the cylindrical body 7 (see FIG. 11(c)). The melting width is preferably 2 mm to 4 mm from the upper end of the cylindrical body 7. By increasing or decreasing the size of the melting width, the width of the radial direction R and the axial direction Z of the upper elastic ring 31 to be formed can be adjusted. By using the thermal melting process as in this embodiment, the upper elastic ring 31 can be easily formed on the cylindrical body 7, but the upper elastic ring forming step S4 is not limited to this. For example, the upper elastic ring 31 may be formed separately from the cylindrical body 7 and connected to the upper end of the cylindrical body 7. When manufacturing a cylindrical cover that does not have the upper elastic ring 31, the upper elastic ring forming step S4 is omitted.

[0038] The shaping step S5 is a step of fitting a shaping member 15 having a truncated cone shape with an outer diameter slightly larger than the inner diameter of the cylindrical body 7 into the inside of the cylindrical body 7, and expanding the cylindrical body 7 in the radial direction R to shape it. The shaping member 15 is arranged above the cylindrical body 7 fixed to the holder 13 (see FIG. 12(a)), and the pushing member 16 detaches the cylindrical body 7 from the holder 13 and pushes it upward, so that the shaping member 15 is fitted into the inside of the cylindrical body 7 (see FIG. 12(b)). By performing the shaping step S5, the individual difference in the shape of the manufactured cylindrical cover 101 can be reduced, and the quality can be stabilized. Furthermore, the appearance of the cylindrical cover 101 is improved by molding. The method of fitting the shaping member 15 into the inside of the cylindrical body 7 is not limited to this, and for example, the shaping member 15 may be inserted into the fixed cylindrical body 7.

[0039] The lower elastic ring forming step S6 is a step of forming the lower elastic ring 32, which is an annular ring body protruding toward the outside of the cylindrical body 7, at the lower end of the cylindrical body 7. The heated metal plate 17 is pressed against the lower end of the cylindrical body 7 that is lifted while being fitted with the shaping member 15, and melted (see Figs. 13(a) and 13(b)), to form the annular lower elastic ring 32 protruding toward the outside of the cylindrical body 7 (see Fig. 13(c)). The melting width is preferably 2 mm to 4 mm from the lower end of the cylindrical body 7. By increasing or decreasing the size of the melting width, the width of the radial direction R and the axial direction Z of the lower elastic ring 32 to be formed can be adjusted. As in the case of the upper elastic ring forming step S4, the lower elastic ring 32 can be easily formed on the cylindrical body 7 by using a thermal melting process, but the lower elastic ring forming step S6 is not limited thereto, and may be, for example, formed separately from the cylindrical body 7 and connected to the lower end of the cylindrical body 7. When manufacturing a cylindrical cover that does not include the lower elastic ring 32, the lower elastic ring forming step S6 is omitted.

[0040] Since the method for manufacturing the cylindrical cover 101 of this embodiment includes the above steps S1 to S6, the cylindrical cover 101 can be manufactured efficiently.

[0041] Although the preferred embodiment of the present invention has been described above in detail, the present invention is not limited to the above-mentioned embodiment, and various modifications and changes are possible within the scope of the gist of the present invention described in the claims. For example, the cylindrical cover may have a configuration in which the thickness in the radial direction R and / or the thickness in the axial direction Z are different between the upper elastic ring and the lower elastic ring. [Industrial Applicability]

[0042] INDUSTRIAL APPLICABILITY The cylindrical cover and the method for manufacturing the cylindrical cover according to the present invention can be used in the field of mushroom cultivation and therefore have great industrial applicability. [Explanation of symbols]

[0043] 1, 101, 201... Cylindrical cover 2. Side wall 2a: Inner surface 2b...External surface 21...Welded part 21a...Welding point 22...Through hole 123, 223a, 223b... Convex part 3a: Inner surface 3. Elastic ring 31 Upper elastic ring 32 Lower elastic ring 4. Mushroom cultivation container 41...bottle mouth 5...Resin sheet 5a...Unevenness 6. Sheet material 61 End 7...Cylindrical body 10. Roller for forming unevenness 10a...Roller surface 11...Cylindrical body 11a...Inner mold 11b...Outer mold 12 Horn 13 Holder 14...metal plate 15...Molding parts 16... Push-up member 17...metal plate H3: Thickness M...Mushroom R...radial direction S1...Irregularity formation process S2: Cutting process S3...Welding process S4: Upper elastic ring forming process S5...Molding process S6...Lower elastic ring forming process T2: Thickness T3: Thickness Z...axis direction

Claims

1. A cylindrical resin cover to be attached to a container for growing mushrooms, It comprises a cylindrical side wall portion and an annular elastic ring protruding outward from the side wall portion, The elastic ring is provided at least one of the upper and lower ends of the side wall portion and is a molten portion that is integral with the side wall portion. The inner surface of the elastic ring is smoothly connected to the inner surface of the side wall portion. A cylindrical cover characterized in that multiple units can be stacked because the outer diameter of the lower end of the cylindrical cover is smaller than the inner diameter of the upper end of the cylindrical cover.

2. The cylindrical cover according to claim 1, wherein at least one of the outer surface and inner surface of the side wall portion is provided with irregularities.

3. The cylindrical cover according to claim 2, wherein the aforementioned irregularities are provided continuously in a specific pattern.

4. The cylindrical cover according to any one of claims 1 to 3, wherein the ratio of the thickness of the elastic ring to the thickness of the side wall in the radial direction is 2 to 9.

5. The cylindrical cover according to any one of claims 1 to 3, wherein the thickness of the elastic ring in the radial direction is 0.9 mm to 2 mm.

6. The cylindrical cover according to any one of claims 1 to 3, wherein the thickness of the elastic ring in the axial direction is 0.7 mm to 1.6 mm.

7. The cylindrical cover according to any one of claims 1 to 3, wherein the thickness of the side wall portion in the radial direction is 0.24 mm to 0.35 mm.

8. A method for manufacturing a cylindrical cover made of thermoplastic resin to be attached to a container for mushroom cultivation, A welding process involves overlapping and welding two opposing ends of a thermoplastic resin sheet material to form a cylindrical body from the sheet material, and The process includes forming an elastic ring on at least one of the upper and lower ends of the cylindrical body, the annular elastic ring projecting outward from the cylindrical body, The elastic ring forming step is a step of forming the elastic ring as a molten portion that is integral with the cylindrical body by thermal melting at least one of the upper and lower ends of the cylindrical body. The inner surface of the elastic ring is smoothly connected to the inner surface of the cylindrical body. The outer diameter of the lower end of the cylindrical cover is smaller than the inner diameter of the upper end of the cylindrical cover. A method for manufacturing cylindrical covers, characterized in that multiple cylindrical covers can be stacked by inserting the lower end of one cylindrical cover into the upper end of another cylindrical cover.

9. The method for manufacturing a cylindrical cover according to claim 8, wherein the sheet material has irregularities on one or both sides thereof.

10. A method for manufacturing a cylindrical cover according to claim 8 or 9, comprising a shaping step of inserting a shaping member into the inside of the cylindrical body and shaping it.

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