Cylindrical cover and method for manufacturing a cylindrical 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

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[0003]

[0001] The present invention relates to a cylindrical cover to be attached to a container for mushroom cultivation.

Background Art

[0002] Conventionally, when performing mushroom bed cultivation using a cultivation container, a cylindrical cover is attached to the mouth of the cultivation container in order to guide the upward growth of the mushroom fruit body in a standing state. At the end of mushroom cultivation, for repeated use, the cylindrical cover is removed from the cultivation container, washed, and stored. Since the shape of the cylindrical cover is a frustum of a cone with a reduced diameter from the upper part to the lower part, by inserting the lower part of another cylindrical cover into the upper part of the cylindrical cover and stacking a plurality of cylindrical covers, the storage space required is reduced. Therefore, when using the cylindrical cover, it is necessary to remove one from the stacked plurality of cylindrical covers. However, the cylindrical cover itself is soft, making it difficult to adjust the force for grasping the cylindrical cover, and the stacked cylindrical covers may stick together, making it difficult to remove them. There is a need for a cylindrical cover that can be easily removed.

[0003] Patent Document 1 discloses a mushroom cultivation cover that is attached to a cultivation bottle for mushroom cultivation and grows mushrooms in an aligned state. The cover is composed of a cylindrical body formed by overlapping and welding two opposite ends of a sheet body formed in a belt shape from a resin material, and a protruding portion protruding at least on one of the outer side and the inner side of the cylindrical body is formed on the cylindrical body.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the mushroom cultivation cover described in Patent Document 1 does not have improved strength, so it is still difficult to grasp and has problems with ease of removal. Currently, in most cases, the handling of cylindrical covers is done manually by workers, but in order to realize automation by robots, etc., it is preferable to have one that can be easily grasped. Furthermore, if the cylindrical cover is soft (low strength), there is also the problem of deformation of its shape due to repeated use.

[0006] This invention addresses the above-mentioned problems and aims to provide a cylindrical cover that is easy to handle, has sufficient strength, is easy to remove when stacked, and prevents deformation of its shape. [Means for solving the problem]

[0007] The present invention relates to a cylindrical resin cover to be attached to a mushroom cultivation container, comprising a cylindrical side wall portion and an annular elastic ring protruding outward from the side wall portion, wherein the elastic ring extends to the upper end of the side wall portion. and lower end It is provided such that, in the radial direction, the thickness of the elastic ring is greater than the thickness of the side wall portion, The aforementioned lower end The elastic ring provided therein This cylindrical cover is characterized by the fact that its outer diameter is smaller than the inner diameter of its upper end, allowing multiple units to be stacked.

[0008] With this configuration, the elastic ring provided at the upper end of the side wall imparts elastic force to the cylindrical cover against radial deformation, making it easier to grip. Compared to a cylindrical cover without an elastic ring, the elastic force is greater and the amount of radial deformation can be reduced. but By providing this elastic ring, a worker's finger or a robot hand can be hooked onto it, making it easier to remove one cylindrical cover from a stack of multiple cylindrical covers. The elastic ring is located at the lower end of the cylindrical cover. but Establish By These elastic rings prevent the stacked cylindrical covers from sticking together, making it easier to remove one cylindrical cover from a stack of multiple cylindrical covers. Elastic rings are provided at both the top and bottom ends of the cylindrical cover. By doing so This design allows for the combined effects of both providing the elastic ring at the upper and lower ends of the cylindrical cover, making it easier to remove one cylindrical cover from a stack of multiple cylindrical covers. In addition, the elastic ring improves the strength of the cylindrical cover, preventing deformation. The elastic ring is preferably a molten portion integrated with the side wall. The material of the cylindrical cover is not limited as long as it can be given radial elastic force by the presence of the elastic ring, and examples include polypropylene (PP), high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE). "Cylindrical" means a shape that is substantially cylindrical, and may include, for example, those with one or both ends being elliptical or oblong, or tapered shapes with different sizes at both ends.

[0009] In this invention, it is preferable that at least one of the outer and inner surfaces of the side wall portion is provided with irregularities. With this configuration, the irregularities further prevent stacked cylindrical covers from sticking together. Furthermore, the irregularities improve the water drainage performance of the cylindrical cover, allowing for efficient drying after washing.

[0010] In this invention, it is preferable that the aforementioned irregularities are provided continuously in a specific pattern. This configuration can further improve the water drainage performance of the cylindrical cover. Examples of specific patterns include grid patterns, staggered patterns, and similar patterns.

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

[0012] In this 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 allows for sufficient strength to be provided to the cylindrical cover. When the elastic ring is provided at the upper end of the cylindrical cover within the above thickness range, sufficient thickness is obtained for a worker's fingers or a robot hand to hook onto the elastic ring. When the elastic ring is provided at the lower end of the cylindrical cover within the above thickness range, it is possible to prevent stacked cylindrical covers from sticking together and to suppress the bulkiness caused by stacking.

[0013] In this 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 allows for improved handling and sufficient strength to prevent deformation of the shape.

[0014] In this 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. This configuration makes it possible to achieve both the strength of the side wall and production costs.

[0015] The present invention relates to a method for manufacturing a cylindrical cover made of thermoplastic resin to be attached to a mushroom cultivation container, comprising a welding step, in which two opposing ends of a thermoplastic resin sheet material are overlapped and welded together to form a cylindrical body from the sheet material, and the upper end of the cylindrical body and lower endThe process includes an elastic ring forming step of forming an annular elastic ring that protrudes toward the outside of the cylindrical body, wherein in the radial direction of the cylindrical cover, the thickness of the elastic ring is greater than the thickness of the cylindrical body, and the lower end of the cylindrical cover The elastic ring provided therein The outer diameter of the cylindrical cover is smaller than the inner diameter of the upper end of the cylindrical cover, and multiple cylindrical bodies can be stacked by inserting the lower end of one cylindrical cover into the upper end of another cylindrical cover.

[0016] According to this configuration, the upper end of the cylindrical side wall portion is made from a resin sheet material. and lower end A cylindrical cover with an elastic ring formed on it can be manufactured. For the reasons mentioned above, the manufactured cylindrical cover has a strength that is easy to handle, makes it easy to remove one cylindrical cover from a stack of multiple cylindrical covers, and prevents deformation of its shape. The material of the sheet material is not limited as long as it can impart radial elasticity to the cylindrical cover by providing an elastic ring, and examples 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. With this configuration, it is possible to manufacture a cylindrical cover in which irregularities are provided on at least one of the outer and inner surfaces of the side wall, thereby further preventing stacked cylindrical covers from sticking together due to the irregularities.

[0018] The present invention preferably includes a shaping step in which a shaping member is inserted into the interior of the cylindrical body to shape it. With this configuration, the cylindrical cover is expanded radially by the shaping member, thereby reducing individual differences in the shape of the manufactured cylindrical cover and stabilizing quality. Furthermore, the shaping also improves the appearance. When an inverted truncated cone-shaped mold is used as the shaping member, the roundness of both ends of the cylindrical cover can be improved.

[0019] In this invention, the elastic ring forming step is performed at the upper end of the cylindrical body. and lower end Preferably, it is a step of forming the elastic ring by thermally melting the above. According to this configuration, the formation of the elastic ring is easy.

Effects of the Invention

[0020] Since the cylindrical cover of the present invention has an elastic ring at at least one of the upper end and the lower end, it has an easy-to-handle strength, is easy to remove when the cylindrical covers are stacked, and can prevent deformation of the shape.

Brief Description of the Drawings

[0021] [Figure 1] It is a perspective view of the cylindrical cover of the embodiment of the present invention. [Figure 2] It is a front view of the same. [Figure 3] It is a partial cross-sectional view taken along line III-III of FIG. 2. [Figure 4] It is a front view showing the cylindrical covers of the embodiment of the present invention stacked in plurality. [Figure 5] It is a front view showing the usage state of the cylindrical cover. [Figure 6] It is a front view showing a modified example of the cylindrical cover of the embodiment of the present invention. [Figure 7] It is a front view showing another modified example of the same. [Figure 8] It is a process chart of the manufacturing method of the cylindrical cover of the embodiment of the present invention. [Figure 9] It is a perspective view showing the uneven formation step in the manufacturing method of the cylindrical cover of the embodiment of the present invention. [Figure 10] It is a front view showing the welding step of the same. [Figure 11] It is a front view showing the upper elastic ring forming step of the same. [Figure 12] It is a front view showing the shaping step of the same. [Figure 13] It is a front view showing the lower elastic ring forming step of the same.

Modes for Carrying Out the Invention

[0022] [Cylindrical cover] The cylindrical resin cover to be attached to the mushroom cultivation container of this embodiment will be described with reference to Figures 1 to 7. The cylindrical cover 1 has circular openings at both ends, and is provided with a tapered cylindrical side wall portion 2 that is hollow inside and has an inverted frustoconical shape, i.e., a side wall portion 2 that is circular in diameter from the top end to the bottom end, and an annular elastic ring 3 that protrudes outward from the side wall portion 2 (radial direction R of the cylindrical cover 1), with the elastic rings 3 provided at both ends (top and bottom ends) of the side wall portion 2 (see Figures 1 to 3). By inserting the bottom end of one cylindrical cover 1 into the top end of another cylindrical cover 1, they can be stacked (see Figure 4). Because the cylindrical cover 1 has sufficient strength to be gripped due to the elastic rings 3 at both ends, it can be easily gripped by workers, and the cylindrical cover 1 is easy to handle. The cylindrical cover 1 is transparent blue and is light-transmitting, 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 be provided with a radial elastic force R by having an elastic ring 3, and examples 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 according to the shape of the mushroom cultivation container used, the type of mushroom to be cultivated, the cultivation environment, etc., and an example is a cover with a height of 12 cm, an inner diameter of 8.5 cm at the upper end, and an inner diameter of 7.5 cm at the lower end, but it is not limited to this. The cylindrical cover 1 of this embodiment is provided with elastic rings 3 at both the upper and lower ends, but it may also be configured to have an elastic ring 3 at only one of the upper or lower ends.

[0023] The side wall portion 2 is formed into a cylindrical shape by overlapping opposite ends of a resin sheet material and ultrasonically welding them together, and has a welded portion 21 with multiple welding points 21a. In this embodiment, as shown in Figure 1, the welded portion 21 of the cylindrical cover 1 has welding points 21a arranged in three rows along the axial direction Z, but it is not limited to this as long as it has a bonding strength that can maintain its shape even when the cylindrical cover 1 is used repeatedly. The welding method is not limited to this, and known welding methods, such as 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 cost-effectiveness can be achieved.

[0025] Multiple circular through-holes 22 are provided in the side wall portion 2. The through-holes 22 are provided for the respiration of the cultivated mushrooms and prevent a decrease in oxygen concentration inside the cylindrical cover 1. In addition, they also prevent stacked cylindrical covers 1 from sticking together. The shape of the through-holes 22 is not particularly limited, and rectangular, polygonal, elliptical, or oblong shapes can also be used. The size and number of through-holes 22 are not particularly limited as long as the self-supporting strength of the cylindrical cover 1 is not impaired.

[0026] The elastic ring 3 is annular members located at both ends of the side wall portion 2, and consists of an upper elastic ring 31 at the upper end and a lower elastic ring 32 at the lower end. The elastic ring 3 imparts elastic force to the cylindrical cover 1 against deformation in the radial direction R, thereby improving the strength of the cylindrical cover 1, making it easier to grasp and preventing deformation. The presence of the upper elastic ring 31 makes it easier to remove one cylindrical cover 1 from a stack of cylindrical covers 1 by allowing the operator's fingers or a robot hand to hook onto the upper elastic ring 31 of the cylindrical cover 1 to be removed (see Figure 4). The presence of the lower elastic ring 32 prevents the cylindrical covers 1 from sticking together when stacked, making it easier to remove one cylindrical cover 1 from a stack of 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 Figure 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, i.e., 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 together and to suppress the bulkiness caused by 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 in the radial direction R and / or the thickness H3 in the axial direction Z of the elastic ring 3 may be different for 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 achieve improved handling and sufficient strength to prevent deformation of the shape.

[0028] The method of using the cylindrical cover 1 is described below. Remove one cylindrical cover 1 from the stack of cylindrical covers 1 (see Figure 4). Place the lower end of the removed cylindrical cover 1 over the mouth 41 of the mushroom cultivation container 4 and attach it (see Figure 5). Cultivate mushrooms M in the mushroom cultivation container 4 with the cylindrical cover 1 attached. When cultivation is complete, grasp the cylindrical cover 1 together with the mushrooms M located inside and separate the cylindrical cover 1 and the mushrooms M from the mushroom cultivation container 4. Remove the mushrooms M from the cylindrical cover 1 and separate the mushrooms M from the cylindrical cover 1. Wash the separated cylindrical cover 1. Stack the multiple cylindrical covers 1 for storage and drying. The dried cylindrical covers 1 can be attached to another mushroom cultivation container 4 and reused. Throughout this series of uses, the elastic ring 3 of the cylindrical cover 1 gives the cylindrical cover 1 sufficient strength for gripping, making it easy to grasp and easy to handle. The cylindrical cover 1 is easy to grasp not only by human hands but also by machines such as robotic hands, making it suitable for automating operations.

[0029] <Variation> Figures 6 and 7 show modified examples of the cylindrical cover of this embodiment, in which protrusions are provided on the inner surface 2a and outer surface 2b of the side wall portion 2. The cylindrical cover 101 shown in Figure 6 is one modified example of this embodiment. The cylindrical cover 101 has irregularly arranged, substantially circular protrusions 123 on the inner surface 2a and outer surface 2b of the side wall portion 2. The protrusions 123 prevent stacked cylindrical covers 101 from sticking together and improve the water drainage performance when washing the cylindrical cover 101. Furthermore, the protrusions 123 increase the frictional force with the side wall portion 2 when gripping the cylindrical cover 101, thus also exhibiting an anti-slip effect. The cylindrical cover 201 shown in Figure 7 is another modified example of this embodiment. The cylindrical cover 201 has substantially circular protrusions 223a provided continuously in a specific pattern on the inner surface 2a of the side wall portion 2, and linear protrusions 223b provided continuously in a specific pattern on the outer surface 2b. Even a cylindrical cover 201 having such protrusions 223a and 223b can achieve the same effect as the protrusions 123 of the cylindrical cover 101. In the two modified examples above, the protrusions are shown on both the inner surface 2a and the outer surface 2b of the side wall 2, but the invention is not limited thereto. The protrusions may be provided on only one of the inner surface 2a or the outer surface 2b, and their arrangement may be irregular or regular. The shape of the protrusions is also not limited and may be, for example, rectangular or polygonal. Furthermore, recesses may be provided instead of protrusions.

[0030] If a protrusion is provided on the inner surface 2a, the height of the protrusion is preferably 0.01 mm to 0.2 mm. If a recess is provided on the inner surface 2a, the depth of the recess is preferably 0.01 mm to 0.2 mm. If the height of the protrusion and the depth of the recess on the inner surface 2a are within this range, it is possible to maintain an appropriate humidity level inside the cylindrical cover during mushroom cultivation and to prevent damage to the mushrooms when removing the cylindrical cover at the end of cultivation. If a protrusion is provided on the outer surface 2b, the height of the protrusion is preferably 0.01 mm to 0.2 mm. If a recess is provided on the outer surface 2b, the depth of the recess is preferably 0.01 mm to 0.2 mm. If the height of the protrusion and the depth of the recess on the outer surface 2b are within this range, it is possible to achieve both sufficient drainage and appropriate frictional force.

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

[0032] The cylindrical cover 1 of this embodiment provides the following effects: Because an elastic ring 3 is provided, it is easy to grasp and deformation is prevented. When removing one cylindrical cover 1 from a stack of multiple cylindrical covers 1, the removal operation is easy because a finger or the like can be hooked onto the upper elastic ring 31 of the cylindrical cover 1 to be removed. When multiple cylindrical covers 1 are stacked, the through hole 22 in the side wall portion 2 and the lower elastic ring 32 prevent the cylindrical covers 1 from sticking together, making the removal operation easy. If the cylindrical cover has a convex portion and / or a concave portion on the side wall portion 2, the sticking of the cylindrical covers together can be further prevented.

[0033] [Manufacturing method for cylindrical covers] 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 Figures 8 to 13. The method for manufacturing the cylindrical cover of this embodiment comprises a bump formation step S1, a cutting step S2, a welding step S3, an upper elastic ring formation step S4, a shaping step S5, and a lower elastic ring formation step S6 (see Figure 8), and is a method for manufacturing the modified cylindrical cover 101 having protrusions 123 on the inner surface 2a and outer surface 2b of the side wall portion 2 from a long thermoplastic resin sheet 5 wound into a roll. When manufacturing a cylindrical cover 1 without protrusions on the side wall portion 2, the bump formation step S1 is omitted. The method for manufacturing the cylindrical cover of this embodiment includes both an upper elastic ring formation step S4 and a lower elastic ring formation step S6 as elastic ring formation steps, so it is possible to manufacture a cylindrical cover having elastic rings 3 at both the upper and lower ends, but is not limited to this. The present invention provides a method for manufacturing a cylindrical cover, which includes at least one of the upper elastic ring forming step S4 and the lower elastic ring forming step S6 as an elastic ring forming step. This allows for the production of a cylindrical cover having an elastic ring 3 at at least one of its upper and lower ends. The resin sheet is transparent blue and translucent, 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 elasticity to the cylindrical cover produced by providing the elastic ring. Examples include polypropylene, high-density polyethylene (HDPE), low-density polyethylene (LDPE), and linear low-density polyethylene (LLDPE).

[0034] The unevenness formation step S1 is a step in which unevenness 5a is formed on one or both sides of a long thermoplastic resin sheet 5 wound into a roll. 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 Figure 9). The unevenness 5a formed in this step are the protrusions or recesses provided on the side wall portion of the cylindrical cover. By changing the shape of the roller surface 10a, the shape of the unevenness 5a formed on the resin sheet 5 can be changed. Therefore, it is also possible to manufacture a cylindrical cover 201 having substantially circular protrusions 223a continuously provided in a specific pattern on the inner surface 2a of the side wall portion 2, and linear protrusions 223b continuously provided in a specific pattern on the outer surface 2b. When manufacturing a cylindrical cover 1 without protrusions or recesses, the unevenness formation step S1 is omitted.

[0035] The cutting process S2 involves cutting out a sheet material 6 of a suitable size for forming a cylindrical cover 101 from the resin sheet 5, which has been formed with irregularities 5a on one or both sides after the irregularity formation process S1, and further providing through holes 22 in the sheet material 6. This process makes it possible to form a sheet material 6 that has irregularities 5a on one or both sides and has through holes 22. The cutting process S2 can be carried out by known sheet processing methods, such as cutting and perforating the resin sheet 5 using a press machine (not shown), so a detailed explanation is omitted here.

[0036] The welding process S3 is a process in which two opposing ends 61, 61 of the sheet material 6 are overlapped and welded together to form a cylindrical body 7 from the sheet material 6. First, a cylindrical body 11 consisting of a pair of outer molds 11a and an inner mold 11b located in the center is used to place the sheet material 6 so that two opposing ends 61, 61 are overlapped between the outer molds 11a and the inner mold 11b (see Figures 10(a) and (b)). Then, a horn 12 that transmits ultrasonic waves is brought into contact with the position where the ends 61 overlap to perform ultrasonic welding (see Figure 10(c)) and form a cylindrical body 7 with a welded portion 21 (see Figure 10(d)). By using ultrasonic welding, only specific parts can be quickly welded, resulting in high production efficiency. In this embodiment, ultrasonic welding is used to form the cylindrical body 7, but it is not limited to this, and known welding methods such as heat welding can also be used.

[0037] The upper elastic ring formation step S4 is a step in which an upper elastic ring 31, which is an annular ring body that protrudes outward from the cylindrical body 7, is formed at the upper end of the cylindrical body 7. The cylindrical body 7 is fixed with a holder 13 (see Figure 11(a)), and a heated metal plate 14 is pressed against the upper end of the cylindrical body 7 and melted (see Figure 11(b)) to form an annular upper elastic ring 31 that protrudes outward from the cylindrical body 7 (see Figure 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 radial R and axial Z widths of the formed upper elastic ring 31 can be adjusted. As in this embodiment, the upper elastic ring 31 can be easily formed on the cylindrical body 7 by using a heat melting process, but the upper elastic ring formation 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 without the upper elastic ring 31, the upper elastic ring forming step S4 is omitted.

[0038] The shaping process S5 is a process in which a frustoconical shaping member 15, which has an outer diameter slightly larger than the inner diameter of the cylindrical body 7, is fitted into the inside of the cylindrical body 7, thereby expanding the cylindrical body 7 in the radial direction R and shaping it. The shaping member 15 is positioned above the cylindrical body 7 fixed to the holder 13 (see Figure 12(a)), and the cylindrical body 7 is detached from the holder 13 by the push-up member 16 and pushed upward, thereby fitting the shaping member 15 into the inside of the cylindrical body 7 (see Figure 12(b)). By performing the shaping process S5, individual differences 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 also improved by the 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 in which a lower elastic ring 32, which is an annular ring body that protrudes outward from the cylindrical body 7, is formed at the lower end of the cylindrical body 7. By pressing a heated metal plate 17 against the lower end of the cylindrical body 7, which is suspended while fitted with the shaping member 15, and melting it (see Figures 13(a) and (b)), an annular lower elastic ring 32 that protrudes outward from the cylindrical body 7 is formed (see Figure 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 radial R and axial Z widths of the lower elastic ring 32 to be formed can be adjusted. Similar to the upper elastic ring forming step S4, the lower elastic ring 32 can be easily formed on the cylindrical body 7 by using a heat melting treatment, but the lower elastic ring forming step S6 is not limited to this, and for example, the lower elastic ring 32 may be formed separately from the cylindrical body 7 and connected to the lower end of the cylindrical body 7. When manufacturing a cylindrical cover without the lower elastic ring 32, the lower elastic ring forming step S6 is omitted.

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

[0041] Although preferred embodiments of the present invention have been described in detail above, the present invention is not limited to the embodiments described above, and various modifications and changes are possible within the scope of the gist of the present invention as described in the claims. For example, a cylindrical cover may be constructed in which the upper elastic ring and the lower elastic ring have different thicknesses in the radial direction R and / or axial direction Z. [Industrial applicability]

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

[0043] 1, 101, 201... Cylindrical cover 2. Side wall section 2a...Inner surface 2b...External surface 21...Welded part 21a...Welding point 22... Through hole 123, 223a, 223b... protruding parts 3a...Inner surface 3. Elastic ring 31. Upper elastic ring 32. Lower elastic ring 4. Containers for growing mushrooms 41...bottle mouth 5. Resin sheet 5a...Unevenness 6. Sheet material 61...end 7. Cylindrical body 10. Roller for creating uneven surfaces. 10a... Roller surface 11. Cylindrical body 11a...Inner mold 11b...Outer mold 12... Horn 13...Holder 14...metal plate 15. Molding components 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 formation process S5...Molding process S6...Lower elastic ring formation 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 the upper and lower ends of the side wall portion. In the radial direction, the thickness of the elastic ring is greater than the thickness of the side wall portion. A cylindrical cover characterized in that multiple units can be stacked because the outer diameter of the elastic ring provided at the lower end is smaller than the inner diameter of the upper end.

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 at the upper and lower ends of the cylindrical body, with the annular elastic rings protruding outward from the cylindrical body. In the radial direction of the cylindrical cover, the thickness of the elastic ring is greater than the thickness of the cylindrical body. The outer diameter of the elastic ring provided at 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 bodies 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.

11. The method for manufacturing a cylindrical cover according to claim 8 or 9, wherein the elastic ring forming step is a step of forming the elastic ring by heat melting the upper and lower ends of the cylindrical body.

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