Vacuum molding apparatus for manufacturing resin container

Abstract

Disclosed is a vacuum molding apparatus for manufacturing a resin container. According to one aspect of the present invention, provided is a vacuum molding apparatus comprising: a support unit that supports a pair of resin container members in a state of being spaced apart from each other; and a vacuum molding unit that vacuum-molds a resin solvent filled in a filling space formed between a pair of fusion ends of the pair of resin container members facing each other.

Description

Vacuum forming device for manufacturing resin containers

[0001] The present invention relates to a vacuum forming device for manufacturing a resin container.

[0002] Conventionally, methods for manufacturing resin containers, such as liners for hydrogen storage tanks, have been used, such as injection molding at once, or directly heating each end of a pair of resin container members constituting the resin container with a hot plate or the like while vertically aligning them, and then applying pressure from both sides to fuse the ends of the pair of resin container members. However, the first method described above has problems such as difficulty in manufacturing medium- to large-sized resin containers due to the characteristic of using a mold for the entire shape, and the second method described above has problems in that it is difficult to manufacture large resin containers because it is performed with a pair of resin container members aligned vertically, and quality defects such as non-melting or insufficient melting at the fused portion, carbonization due to overheating, unbalanced fusion, and bubble formation due to moisture absorption may occur due to difficulties in controlling the heating temperature, and some of the fused portion is pushed outward by the pressurization, forming a hardened bead, requiring a post-processing process to cut and remove it.

[0003] [Prior Art Literature]

[0004] [Patent Document]

[0005] Republic of Korea Patent Publication No. 10-2022-0069657 (published on May 27, 2022)

[0006] The present invention is intended to solve the above-mentioned problems, and provides a vacuum forming device for manufacturing a resin container, which can manufacture resin containers of various sizes from small to large, can manufacture resin containers with high fusion strength and fusion quality, and can increase the productivity of manufacturing resin containers.

[0007] According to one aspect of the present invention, a vacuum forming device is provided, which includes a support unit that supports a pair of resin container members while being spaced apart from each other, and a vacuum forming unit that vacuum forms a resin material filled in a filling space formed between a pair of opposing fused ends of the pair of resin container members.

[0008] The support units are provided in pairs to support a pair of resin container members, and the vacuum forming units are provided in pairs to be combined with the pair of support units and move toward each other so as to be placed on a filling space, thereby enabling the resin material to be vacuum formed.

[0009] The vacuum forming unit includes a mold disposed on one side of the support unit and forming a resin material with a lower forming surface, and a second cylinder coupled to the other side of the support unit and connected to the mold after penetrating the support unit to move the mold back and forth, and at least one of the pair of vacuum forming units may further include a vacuum suction pipe disposed on the mold to form a vacuum state between the pair of molds and the resin material by sucking air in a space between the pair of molds and the resin material.

[0010] The vacuum forming unit may further include a packing disposed at the bottom of the mold, which moves together with the mold as the mold is moved toward the filling space by the second cylinder, pressurizes the packing toward the resin container member, and adheres closely to the resin container member to maintain an airtight seal between the mold and the resin material.

[0011] The support unit has a wedge-shaped pressing groove formed at one end thereof, and the packing is formed so that one end thereof corresponds to the shape of the pressing groove and is placed in the pressing groove. As the mold is moved toward the filling space by the second cylinder, the packing moves together with the mold, and one end thereof is pressed toward the resin container member by the inclined surface of the pressing groove, so that it is in close contact with the resin container member, thereby maintaining an airtight seal between the mold and the resin material.

[0012] The packing may be provided with a first anti-separation spring arranged at one end of the packing to pressurize one end of the packing toward the pressurizing groove to prevent one end of the packing from coming off from the pressurizing groove.

[0013] The mold has a fixed groove formed in a shape that is bent upward at the bottom, and the packing is placed in the fixed groove with the other end formed to correspond to the shape of the fixed groove, and as the mold is moved toward the filling space by the second cylinder, the other end is restrained between the fixed groove and the resin container member so that it can move together with the mold.

[0014] The packing may be provided with a second anti-separation spring arranged at the other end of the packing to press the other end of the packing toward the fixing groove to prevent the other end of the packing from coming off from the fixing groove.

[0015] The mold may further include a through hole formed with a catch provided inside, and a vacuum forming unit disposed in the through hole and coupled to the support unit at one end, but which catches the catch at the catch at the other end as the mold is moved toward the filling space by the second cylinder, thereby limiting the movement distance of the mold.

[0016] At least one of the pair of vacuum forming units may further include an O-ring disposed in the mold and interposed between the pair of molds as the pair of molds move toward each other to prevent impact between the pair of molds and to seal between the pair of molds to maintain an airtight seal between the mold and the resin material.

[0017] According to the present invention, it is possible to manufacture resin containers of various sizes from small to large, manufacture resin containers with high fusion strength and fusion quality, and increase the productivity of manufacturing resin containers.

[0018] Figure 1 is a flowchart showing a method for manufacturing a resin container according to one embodiment of the present invention.

[0019] Figures 2 to 11 are drawings showing a resin container manufacturing device according to one embodiment of the present invention.

[0020] FIGS. 12 to 21 are drawings showing various embodiments of a fusion end of a resin container member according to one embodiment of the present invention.

[0021] [Explanation of symbols]

[0022] 100: Resin container manufacturing device 120: Support unit 121: Pressurizing groove 124: Inner ring

[0023] 125: Inclined surface 126: Outer ring 127: Bearing 128: Chain 130: Support pad

[0024] 131: Support 132: Restoration spring 133: Shape support ring 134: Support groove

[0025] 135: Support adjustment unit 136: Pressure pad 137: First cylinder 140: Filling unit

[0026] 152: Through hole 153: Hook 154: Stopper 160: Preheating unit 162: Blower

[0027] 163: Moving tube 164: First heater 165: Discharge tube 166: Discharge port 170: Second heater

[0028] 180: Rotating unit 190: Vacuum forming unit (vacuum forming device) 191: Mold

[0029] 192: Fixed groove 193: Forming surface 194: Packing 195: First anti-separation spring

[0030] 196: Second anti-separation spring 197: Vacuum intake pipe 198: Second cylinder

[0031] 199: O-ring 200: Resin container 210: Resin solvent 220: Resin container member

[0032] 240: joint portion 260: fusion end portion 261: first protrusion 262: second protrusion

[0033] 263: First slope 264: Third projection 265: Second slope 266: Recess

[0034] 267: Third slope 268: Fourth projection 269: Extension 270: Cover

[0035] 271: Protrusion 280: Filling space

[0036] The present invention is susceptible to various modifications and embodiments. Specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, but rather to encompass all modifications, equivalents, and alternatives falling within the spirit and technical scope of the present invention. In describing the present invention, detailed descriptions of related known technologies will be omitted if they are deemed to obscure the gist of the present invention.

[0037] Terms such as first, second, etc. may be used to describe various components, but these components should not be limited by these terms. These terms are used solely to distinguish one component from another.

[0038] The terminology used in this application is only used to describe specific embodiments and is not intended to limit the present invention. The singular expression includes the plural expression unless the context clearly indicates otherwise. In this application, it should be understood that the terms "comprise" or "have" indicate the presence of a feature, number, step, operation, component, part, or combination thereof described in the specification, but do not exclude in advance the possibility of the presence or addition of one or more other features, numbers, steps, operations, components, parts, or combinations thereof.

[0039] Hereinafter, a resin container (200) and a manufacturing method and a manufacturing device (100) according to the present invention will be described in detail with reference to the attached drawings. In the description with reference to the attached drawings, identical or corresponding components are assigned the same drawing numbers, and redundant descriptions thereof are omitted.

[0040]

[0041] First, a method for manufacturing a resin container according to one embodiment of the present invention will be described.

[0042] According to the present embodiment, in a method for manufacturing a resin container (200) by fusing a pair of resin container members (220) as illustrated in FIG. 1 and the like, a method for manufacturing a resin container is provided, including a step (S130) of arranging a pair of resin container members (220) to be spaced apart from each other, a step (S150) of filling a molten resin material (210) into a filling space (280) formed between a pair of mutually opposing fused ends (260) of a pair of resin container members (220), and a step (S170) of curing the resin material (210).

[0043] According to this embodiment, it is possible to manufacture resin containers (200) of various sizes from small to large, manufacture resin containers (200) with high fusion strength and fusion quality, and increase the productivity of manufacturing resin containers (200).

[0044] Hereinafter, each step of the method for manufacturing a resin container according to the present embodiment will be described with reference to FIG. 1, etc.

[0045]

[0046] This embodiment relates to a method for manufacturing a resin container (200) by mutually fusing a pair of resin container members (220).

[0047] The resin container (200) may be specifically a liner of a hydrogen storage tank, but is not limited thereto, and any container formed of a resin or a material including a resin may be included in the resin container (200).

[0048] The resin container member (220) constitutes the resin container (200) and can be formed by molding a resin or a material including resin using various molding methods including injection molding.

[0049] A pair of resin container members (220) may be formed in shapes corresponding to each other, but the fusion end portions (260) where fusion occurs as ends of the resin container members (220) may be formed to correspond to each other, but the shapes of the other portions may be formed differently from each other.

[0050] In step 130, a pair of resin container members (220) can be placed spaced apart from each other.

[0051] As a pair of resin container members (220) are arranged spaced apart from each other, a pair of fusion ends (260) face each other, and at this time, a filling space (280) for filling a molten resin material (210) for fusion of a pair of resin container members (220) can be formed between the pair of fusion ends (260).

[0052] In order to manufacture the resin container (200) to its designed length, a pair of resin containers (200) can be spaced apart from each other by taking into consideration the designed length of the resin container (200) and the actual length of each resin container member (220).

[0053] For example, if the actual length of one of the pair of resin container members (220) is shorter than its design length, the pair of resin container members (220) may be spaced apart from each other by making the distance between the pair of resin container members (220) longer than the design distance in order to manufacture the resin container (200) to its design length.

[0054] Before the step (S130) of arranging a pair of resin container members (220) to be spaced apart from each other, a step (S120) of aligning a pair of resin container members (220) horizontally may be further included.

[0055] By fusing a pair of resin container members (220) by aligning them horizontally, a large resin container (200) can be easily manufactured compared to fusing a pair of resin container members (220) by aligning them vertically.

[0056] In step 150, a molten resin material (210) can be filled into a filling space (280) formed between a pair of opposing fusion ends (260) of a pair of resin container members (220).

[0057] Before the step (S150) of filling the resin material (210), a step (S110) of melting the resin or a material including the resin to prepare the resin material (210) in a molten state may be further included.

[0058] In the step (S110) of preparing the resin material (210), the temperature of the resin material (210) can be controlled to prevent over-melting, under-melting, or insufficient melting of the resin material (210).

[0059] In addition, in the step (S110) of preparing the resin solvent (210), the temperature of the resin solvent (210) can be controlled according to the residence or waiting time of the resin solvent (210) in order to prevent changes in the physical properties according to the residence or waiting time of the resin solvent (210).

[0060] In the step (S110) of preparing the resin solvent (210), before filling the resin solvent (210), a set amount of the resin solvent (210) located on the side of the discharge port through which the resin solvent (210) is discharged and having a possibility of changing physical properties can be removed or discarded.

[0061] In the step (S150) of filling the resin material (210), in order to manufacture the resin container (200) to its designed length, the discharge amount of the resin material (210) can be controlled according to the distance between a pair of resin container members (220) spaced apart in consideration of the designed length of the resin container (200) and the actual length of each resin container member (220).

[0062] For example, if the actual length of one of the pair of resin container members (220) is shorter than its design length, the distance between the pair of resin container members (220) can be made longer than the design distance to manufacture the resin container (200) to its design length, and the pair of resin container members (220) can be spaced apart and arranged, and thereafter, the discharge amount of the resin material (210) can be controlled according to the distance between the pair of resin container members (220).

[0063] In the step (S150) of filling the resin material (210), the resin material (210) can be filled into the filling space (280) while rotating a pair of resin container members (220).

[0064] Accordingly, the resin material (210) can be uniformly and effectively filled into the filling space (280).

[0065]

[0066] *Before the step (S150) of filling the resin material (210), a step (S140) of preheating the fusion end (260) may be further included.

[0067] By preheating the fusion end (260) before filling the molten resin material (210) into the filling space (280) formed between a pair of fusion ends (260), the fusion strength between the resin material (210) and the fusion end (260) can be increased.

[0068] In the step (S140) of preheating the fusion end (260), the outer surface of the fusion end (260) can be heated until it becomes molten.

[0069] In the step (S140) of preheating the fusion end (260), the fusion end (260) can be heated in an indirect heating manner to prevent carbonization from occurring in the fusion end (260).

[0070] Specifically, the indirect heating method may be to blow hot air toward the fusion end (260), irradiate infrared heat, or blow hot air toward the fusion end (260) and irradiate infrared heat at the same time.

[0071] In the step (S140) of preheating the fusion end (260), the fusion end (260) can be heated while rotating the resin container member (220).

[0072] By rotating the resin container member (220) while heating the fusion end (260) to preheat the fusion end (260), it is possible to prevent the fusion end (260) from being partially heated, or overheating, underheating, or insufficient heating occurring in a part of the fusion end (260), or carbonization occurring in the fusion end (260).

[0073] Specifically, in the step (S140) of preheating the fusion end (260), a pair of resin container members (220) can be heated together while rotating a pair of resin container members (220) while being spaced apart from each other.

[0074] In step 170, the resin material (210) can be hardened.

[0075] The molten resin material (210) can be hardened by shrinking as it cools.

[0076] Before the step (S170) of hardening the resin material (210), a step (S160) of vacuum forming the resin material (210) filled in the filling space (280) may be further included.

[0077] By vacuum forming the resin material (210) before it hardens, the outer surface of the resin material (210), which hardens while shrinking upon cooling, can be finished flat without a separate subsequent process.

[0078] The step (S160) of vacuum forming the resin material (210) may include a step (S161) of placing a mold (192) on the outside of the resin material (210), and a step (S162) of forming a vacuum state between the mold (192) and the resin material (210).

[0079] Accordingly, the resin material (210) can be sucked out and molded by the mold (192) as a vacuum state is formed between the resin material and the mold (192).

[0080] That is, as a vacuum state is formed between the mold (192) placed on the outside of the resin material (210) and the resin material (210), the resin material (210) is sucked into the space between the mold (192) and the vacuum force generated by the pressure difference so that the resin material (210) can be formed by the mold (192).

[0081] The molding surface (193) of the mold (192) may be flat or have a concave shape toward the resin material (210), and the dimensions including the curvature of the molding surface (193) may be set according to the temperature-dependent shrinkage rate of the resin or material including the resin forming the resin material (210).

[0082] In the step (S160) of vacuum forming the resin material (210), the temperature of the mold (192) can be controlled to prevent rapid cooling of the resin material (210) formed by the mold (192).

[0083] In the step of forming a vacuum state (S162), a vacuum can be formed between the mold (192) and the resin material (210) by sucking air in the space between the mold (192) and the resin material (210).

[0084] In the step of forming a vacuum state (S162), the vacuum force generated by the pressure difference between the mold (192) and the resin material (210) allows the resin material (210) to flow and fill the filling space (280) while eliminating the gap generated between the fusion end (260).

[0085] The step (S160) of vacuum forming the resin material (210) may further include, after the step (S162) of forming a vacuum state, a step (S163) of pressurizing a pair of resin container members (220) from both sides to prevent the occurrence of a gap in the filling space (280).

[0086] After forming a vacuum state between the mold (192) and the resin material (210), by pressurizing a pair of resin container members (220) from both sides, the resin material (210) can be made to flow, thereby removing the gap between the resin material (210) and the fusion end (260) that may remain in the filling space (280).

[0087] In the step (S170) of curing the resin material (210), the outer surface of the resin material (210) can be flattened as the resin material (210) shrinks while being cured after vacuum forming.

[0088] The vacuum-formed resin material (210) can be hardened while its outer surface becomes flat due to cooling shrinkage, and accordingly, a separate subsequent finishing process for flattening the outer surface of the resin material (210) is not required.

[0089]

[0090] Next, a resin container manufacturing device (100) according to one embodiment of the present invention will be described.

[0091] According to the present embodiment, in a device for manufacturing a resin container (200) by fusing a pair of resin container members (220) as shown in FIGS. 2 and 3, etc., a resin container manufacturing device (100) is provided, which includes a pair of support units (120) for supporting a pair of resin container members (220) while being spaced apart from each other, and a filling unit (140) for filling a molten resin material (210) into a filling space (280) formed between a pair of mutually opposing fusion ends (260) of the pair of resin container members (220).

[0092] According to this embodiment, it is possible to manufacture resin containers (200) of various sizes from small to large, manufacture resin containers (200) with high fusion strength and fusion quality, and increase the productivity of manufacturing resin containers (200).

[0093] Hereinafter, each component of the resin container manufacturing device (100) according to the present embodiment will be described with reference to FIGS. 2 to 11, etc., but with respect to the method of manufacturing a resin container (200) using the resin container manufacturing device (100) according to the present embodiment, the contents of the resin container manufacturing method described above may be followed.

[0094]

[0095] FIGS. 2 to 11 are drawings showing a resin container manufacturing device (100) according to the present embodiment, wherein FIGS. 2 and 3 are perspective views showing the resin container manufacturing device (100), FIGS. 4 and 5 are perspective views showing a support unit (120) and a vacuum forming unit (vacuum forming device) (190) of the resin container manufacturing device (100), FIGS. 6, 7, and 10 are cross-sectional views taken along line A-A' of FIG. 2, FIGS. 8 and 9 are drawings showing a support pad (122) of the support unit (120) of the resin container manufacturing device (100), and FIG. 11 is a cross-sectional view taken along line B-B' of FIG. 2, which is a drawing showing a filling unit (140) and a preheating unit (160) of the resin container manufacturing device (100).

[0096]

[0097]

[0098] *This embodiment relates to a device for manufacturing a resin container (200) by mutually fusing a pair of resin container members (220).

[0099] A pair of support units (120) can support a pair of resin container members (220) while being spaced apart from each other.

[0100] A pair of support units (120) are provided to be movable forward and backward, and can be moved forward and backward while supporting a pair of resin container members (220) so that the pair of resin container members (220) can be placed apart from each other.

[0101] In order to manufacture a resin container (200) with its designed length using a pair of support units (120), the pair of resin containers (200) can be spaced apart from each other by taking into consideration the designed length of the resin container (200) and the actual length of each resin container member (220).

[0102] A pair of support units (120) can support and horizontally align a pair of resin container members (220).

[0103] The support unit (120) may include a support pad (122) that frictionally supports the outer surface of the resin container member (220), a support adjustment unit (130) that moves the support pad (122) toward or opposite to the outer surface of the resin container member (220) to adjust whether the resin container member (220) is supported by the support pad (122), an inner ring (124) on which the support pad (122) is disposed inside, an outer ring (126) disposed outside the inner ring (124), and a bearing (127) that is disposed between the outer ring (126) and the inner ring (124) and rotates so that the inner ring (124) can rotate.

[0104] A plurality of bearings (127) are provided, and the plurality of bearings (127) can be aligned by being connected to each other by a chain (128).

[0105] Here, the chain (128) can connect a plurality of bearings (127) in which each member is adjacent to each other, and a plurality of chain (128) members can connect a plurality of bearings (127) as one unit.

[0106] More specifically, a pair of chains (128) are connected to a plurality of adjacent bearings (127) to connect the plurality of adjacent bearings (127), and one of the plurality of adjacent bearings (127) is additionally connected to another bearing (127) that is connected to one of the plurality of adjacent bearings (127), so that four chains (128) can be connected to one bearing (127).

[0107] The support pad can support the outer circumferential surface of the resin container member in a process of manufacturing the resin container by fusing a pair of resin container members.

[0108] The support pad (130) may be formed of a collet structure in which a plurality of support parts (131) are spaced apart from each other and connected.

[0109] The support pad (130) may further include a restoring spring (132) that connects a plurality of adjacent support portions (131) and provides elastic force in a direction in which the plurality of support portions (131) move away from each other.

[0110] These restoration springs (132) can be configured as a pair and placed between a plurality of adjacent support members (131), and can be placed on both ends of a pair of support members (131).

[0111] The support pad (130) may further include a shape support ring (133) arranged along the outer periphery of the plurality of support portions (131) to support the shape of the plurality of support portions (131).

[0112] The shape support ring (133) can support the shape of the support pad (130) by preventing the plurality of support portions (131) from being excessively spread out by the restoration spring (132) on the outside of the plurality of support portions (131).

[0113] More specifically, the shape support ring (133) is formed as a pair with different diameters and can support the outer surface of a plurality of support parts (131) at multiple points, and the shape support ring (133) can be placed in a support groove (134) formed on the outer surface of a plurality of support parts (131).

[0114] The support groove (134) can be formed to have a shape that is continuous with respect to a plurality of adjacent support portions (131), and when the shape support rings (133) are formed as a pair, the support grooves (134) can also be formed as a pair so that a pair of shape support rings (133) can be arranged, and the pair of support rings can be arranged to be spaced apart from each other in the support portion (131).

[0115] The above-described pair of restoration springs (132) may be arranged closer to the end of the support portion (131) than the support groove (134), and when the support grooves (134) are formed as a pair, each restoration spring (132) may be arranged on both sides further outward than the pair of support grooves (134).

[0116] The support adjustment unit (135) can adjust whether the resin container member (220) is supported by the support pad (130) by moving the support pad (130) toward or opposite to the outer surface of the resin container member (220).

[0117] The support adjustment unit (135) may include a pressure pad (136) positioned to come into contact with the outer surface of the support pad (130) and a first cylinder (137) that moves the pressure pad (136) to push the support pad (130) toward the outer surface of the resin container member (220).

[0118] The support pad (130) may be formed with a surface that comes into contact with the pressure pad (136) as an inclined surface (125), and the surface that comes into contact with the support pad (130) may be formed with an inclined surface (125) that has an angle corresponding to the inclined surface (125) of the support pad (130), and the support pad (130) and the pressure pad (136) may be arranged so that their inclined surfaces (125) come into contact with each other.

[0119] The first cylinder (137) can move the pressure pad (136) along the longitudinal direction of the resin container member (220), and as the pressure pad (136) moves, the support pad (130) moves toward the outer peripheral surface of the resin container member (220), so that the support pad (130) can support the resin container member (220).

[0120] More specifically, the support pad (130) can be pushed toward the outer surface of the resin container member (220) as the pressure pad (136) moves while pushing the inclined surface (125) of the support pad (130), thereby supporting the resin container member (220).

[0121]

[0122] *The filling unit (140) can fill a molten resin material (210) into a filling space (280) formed between a pair of opposing fusion ends (260) of a pair of resin container members (220).

[0123] The filling unit (140) can prepare a resin material (210) by melting a resin or a material including a resin.

[0124] The filling unit (140) can fill the filling space (280) by discharging or extruding the resin material (210) through the discharge port.

[0125] The filling unit (140) can control the temperature of the resin material (210) to prevent over-melting, under-melting, or insufficient melting of the resin material (210).

[0126] Additionally, the filling unit (140) can manage the temperature of the resin material (210) according to the residence or waiting time of the resin material (210) to prevent changes in the physical properties according to the residence or waiting time of the resin material (210).

[0127] The filling unit (140) can remove or discard a set amount of resin material (210) with a possibility of changing physical properties located on the side of the discharge port through which the resin material (210) is discharged before filling the resin material (210).

[0128] The filling unit (140) can control the discharge amount of the resin material (210) according to the distance between a pair of resin container members (220) spaced apart in consideration of the design length of the resin container (200) and the actual length of each resin container member (220) to manufacture the resin container (200) to its design length.

[0129] The filling unit (140) may have a heater (170) installed on the outside to maintain the internal temperature.

[0130] As shown in Fig. 11, a preheating unit (160) may be further included to preheat a pair of fusion ends (260) formed between a pair of opposing fusion ends (260) of a pair of resin container members (220) before filling the molten resin material (210) into the filling space.

[0131] The preheating unit (160) is positioned outside of a pair of fusion ends (260) before filling the resin material (210) into the filling space (280) so as to heat the pair of fusion ends (260), and through the preheating process by the preheating unit (160), the fusion force between the resin material (210) and the fusion ends (260) that are subsequently filled into the filling space (280) can be increased.

[0132] The preheating unit (160) can heat the outer surface of the fusion end (260) until it becomes molten.

[0133] The preheating unit (160) can further increase the fusion strength between the resin material (210) and the fusion end (260) by heating the outer surface of the fusion end (260) to a high temperature until it melts.

[0134] The preheating unit (160) can heat the fusion end (260) in an indirect heating manner to prevent carbonization from occurring at the fusion end (260).

[0135] Specifically, the indirect heating method may be to blow hot air to the fusion end (260), irradiate infrared heat, or blow hot air and irradiate infrared heat.

[0136] The preheating unit (160) may include a blower (162) that generates wind to send air, a moving pipe (163) that is connected to the blower (162) and through which air moves, a discharge pipe (165) that is connected to the moving pipe (163) and has a discharge port (166) formed therein for blowing hot air to the fusion end (260), and a first heater (164) that is arranged inside the moving pipe (163) and the discharge pipe (165) to heat the air and generate hot air.

[0137] The air that is sent to the moving pipe (163) by the blower (162) by generating wind moves from the moving pipe (163) to the discharge pipe (165), and is heated by the first heater (164) arranged inside the moving pipe (163) and the discharge pipe (165) to become hot air, and the hot air generated in this way can be blown to the fusion end (260) through the discharge port (166).

[0138] The blower (162) may specifically include a fan that rotates to create and send wind, and a motor that rotates the fan.

[0139] The discharge tube (165) is formed to extend to correspond to the shape of the outer surface of the resin container member (220), and the discharge ports (166) may be provided in multiple numbers and arranged spaced apart from each other along the discharge tube (165).

[0140] Accordingly, the fusion end (260) can be effectively heated and evenly heated, thereby preventing carbonization from occurring at the fusion end (260).

[0141] The first heater (164) includes an infrared heating element that generates infrared heat and can irradiate infrared heat to the fusion end (260) through the emission port (166).

[0142] In this case, the first heater (164) not only generates infrared heat through an infrared heating element to heat the air and create hot air, but also can irradiate the infrared heat to the fusion end (260) through the emission port (166).

[0143] The preheating unit (160) may further include a second heater (170) that is arranged on the outside of the moving tube (163) to heat the moving tube (163) and maintain the temperature of the moving tube (163).

[0144] The second heater (170) can maintain the temperature of the moving tube (163) by heating the moving tube (163) from the outside of the moving tube (163).

[0145] Accordingly, the air heated by the first heater (164) while moving within the moving tube (163) can be prevented from cooling and its temperature can be maintained.

[0146] The second heater (170) can be formed to specifically surround the outer surface of the moving pipe (163), and can be provided in multiple numbers and arranged spaced apart from each other along the moving pipe (163).

[0147] The support unit (120) is provided to be rotatable while supporting the resin container member (220), and further includes a rotation unit (180) that rotates the resin container member (220) supported by the support unit (120), and the rotation unit (180) can rotate the resin container member (220) while the preheating unit (160) heats the fusion end (260).

[0148] Specifically, as the rotation unit (180) rotates the inner ring (124) of the support unit (120), the resin container member (220) supported by the support unit (120) can be rotated together.

[0149] By rotating the resin container member (220) using the support unit (120) and the rotation unit (180) while the preheating unit (160) heats the fusion end (260), it is possible to prevent the fusion end (260) from being partially heated, or overheating, underheating, or insufficient heating occurring in a part of the fusion end (260), or carbonization occurring in the fusion end (260).

[0150] The resin container member (220) has a circular cross-section, and the preheating unit (160) can be formed to be curved to correspond to the shape of the outer circumferential surface of the resin container member (220).

[0151] Accordingly, the fusion end (260) of the rotating resin container member (220) can be heated more effectively and evenly, and thus carbonization of the fusion end (260) can be effectively prevented.

[0152] The discharge ports (166) can be arranged spaced apart from each other along the discharge tubes (165) that are formed to be curved to correspond to the shape of the outer surface of the resin container member (220) having a circular cross-section, thereby further enhancing the aforementioned effect.

[0153] Additionally, the rotation unit (180) can rotate a pair of resin container members (220) while the filling unit (140) fills the resin material (210) into the filling space (280).

[0154] Accordingly, the process of filling the resin material (210) by the filling unit (140) can be performed more effectively.

[0155] A vacuum forming unit (190) may further be included for vacuum forming a resin material (210) filled in a filling space (280) formed between a pair of opposing fusion ends (260) of a pair of resin container members (220).

[0156] The vacuum forming unit (190) can be positioned outside the filling space (280) to vacuum form the resin material (210) before the resin material (210) filled in the filling space (280) is cured.

[0157] The resin material (210) is vacuum-formed by a vacuum forming unit (190), and then shrinks and hardens as it cools, so that its outer surface can be finished flat.

[0158] By vacuum forming the resin material (210) before it hardens, the outer surface of the resin material (210), which hardens while shrinking upon cooling, can be finished flat without a separate subsequent process.

[0159] The filling unit (140) may be provided to be able to move up and down, and the vacuum forming unit (190) may be provided to be able to move forward and backward.

[0160] Accordingly, when the filling unit (140) moves downward to fill the filling space (280) with the resin material (210) and then moves upward, the vacuum forming unit (190) moves toward the resin material (210) filled in the filling space (280) to vacuum form the resin material (210).

[0161] The preheating unit (160) is formed to be extended to correspond to the shape of the outer surface of the resin container member (220), and is provided to be movable forward and backward and up and down, so that after moving downward, it moves forward toward the fusion end (260) to preheat the fusion end (260), and then moves backward from the fusion end (260) and then moves upward to allow vacuum forming by the vacuum forming unit (190).

[0162] Meanwhile, the preheating unit (160) can be arranged to be able to move up and down together with the filling unit (140), so that preheating of the fusion end (260) by the preheating unit (160) and filling of the resin material (210) by the filling unit (140) can be performed continuously without separately moving the resin container member (220).

[0163] The preheating unit (160) may have a heater (170) installed on the outside to maintain the internal temperature.

[0164] The vacuum forming unit (vacuum forming device) (190) will be described in detail with reference to FIGS. 2 to 7 and FIG. 10 below.

[0165] The vacuum forming unit (190) is provided as a pair and is combined with a pair of support units (120) so as to move toward each other and be placed on a filling space (280) to vacuum form the resin material (210).

[0166] A pair of vacuum forming units (190) may be coupled to a pair of support units (120) and may be arranged to be movable toward each other.

[0167] A pair of vacuum forming units (190) moved toward each other are placed in contact with or close to each other on the filling space (280), thereby enabling vacuum forming of the resin material (210).

[0168] Specifically, the vacuum forming unit (190) includes a mold (191) disposed on one side of the support unit (120) and forming a resin material (210) with a lower forming surface (193), and a second cylinder (198) coupled to the other side of the support unit (120) and connected to the mold (191) after penetrating the support unit (120) to move the mold (191) back and forth, and at least one of the pair of vacuum forming units (190) may further include a vacuum suction pipe (197) disposed on the mold (191) to form a vacuum state between the pair of molds (191) and the resin material (210) by sucking air in a space between the pair of molds (191) and the resin material (210).

[0169] A pair of molds (191) of a pair of vacuum units are moved toward each other by a second cylinder (198) and placed on a filling space (280), and then a vacuum suction pipe (197) sucks air in the space between the pair of molds (191) and the resin material (210) to form a vacuum state, so that the resin material (210) can be sucked out and molded by the lower molding surface (193) of the pair of molds (191).

[0170] As a vacuum state is formed between a pair of molds (191) and a resin material (210), the resin material (210) flows by a vacuum force resulting from a pressure difference, thereby removing the gap formed between the fusion end (260) and filling the filling space (280). The molding surface (193) of the pair of molds (191) may be flat or have a concave shape toward the resin material (210), and the dimensions including the curvature of the molding surface (193) may be set according to the temperature-dependent shrinkage rate of the resin forming the resin material (210) or a material including the resin.

[0171] The vacuum forming unit (190) may further include a control unit that controls the temperature of a pair of molds (191) so as to prevent rapid cooling of the resin material (210) formed by the pair of molds (191).

[0172] Additionally, the control unit can control the operating distance of the second cylinder (198) or the moving distance of the mold (191), and a distance sensor can be specifically used at this time.

[0173] The vacuum forming unit (190) may further include a packing (194) that is positioned at the bottom of the mold (191) and moves together with the mold (191) as the mold (191) is moved toward the filling space (280) by the second cylinder (198) and pressurizes toward the resin container member (220) to adhere to the resin container member (220) and maintains an airtight seal between the mold (191) and the resin material (210).

[0174] As suction by the vacuum suction tube (197) progresses, a pair of packings (194) are moved toward the resin material (210) by the suction force, and come into closer contact with a pair of resin container members (220), thereby further sealing the space between the pair of molds (191) and the resin material (210), thereby improving the vacuum force.

[0175] The packing (194) may include an insulating material capable of insulating the space between the mold (191) and the resin material (210) to prevent rapid cooling of the resin material (210) molded by the mold (191).

[0176] As the space between the pair of molds (191) and the resin material (210) is insulated by a pair of packings (194) including an insulating material, rapid cooling of the resin material (210) molded by the pair of molds (191) can be prevented.

[0177] As shown in FIGS. 7 and 10, the support unit (120) has a wedge-shaped pressing groove formed at one end thereof, and the packing (194) is formed so that one end thereof corresponds to the shape of the pressing groove and is placed in the pressing groove, and as the mold (191) is moved toward the filling space (280) by the second cylinder (198), the packing (194) moves together with the mold (191) and one end thereof is pressed toward the resin container member (220) by the inclined surface of the pressing groove so as to be in close contact with the resin container member (220) and maintain an airtight seal between the mold (191) and the resin material (210).

[0178] One end of the packing (194) formed in a wedge shape corresponding to the wedge-shaped press groove and placed in the press groove is moved toward the filling space (280) together with the mold (191) by the second cylinder (198) and is pressed toward the resin container member (220) by the tapered slope of the press groove, thereby maintaining airtightness between the mold (191) and the resin material (210) by coming into close contact with the resin container member (220).

[0179] The packing (194) may be provided with a first separation prevention spring (195) that is arranged at one end of the packing (194) and presses one end of the packing (194) toward the pressure groove to prevent one end of the packing (194) from being separated from the pressure groove.

[0180] A first release spring disposed inside one end of the packing (194) presses one end of the packing (194) toward the pressure groove, thereby preventing one end of the packing (194) from being released from the pressure groove and also increasing the pressure due to the inclined surface of the pressure groove.

[0181] As shown in FIG. 7 and FIG. 10, a mold (191) has a fixed groove (192) formed at the bottom in a shape that is bent upwards, and a packing (194) is formed so that the other end corresponds to the shape of the fixed groove (192) and is placed in the fixed groove (192), and as the mold (191) is moved toward the filling space (280) by the second cylinder (198), the other end is restrained between the fixed groove (192) and the resin container member (220) and can move together with the mold (191).

[0182] The other end of the packing (194) is formed to correspond to the fixed groove (192) formed by bending upward at the lower part of the mold (191) and is placed in the fixed groove (192), so that the other end of the packing (194) can be moved together with the mold (191) by being restrained between the fixed groove (192) and the resin container member (220) as the mold (191) is moved toward the filling space (280) by the second cylinder (198).

[0183] The packing (194) may be provided with a second anti-separation spring (196) that is arranged at the other end of the packing (194) and presses the other end of the packing (194) toward the fixing groove (192) to prevent the other end of the packing (194) from coming off from the fixing groove (192).

[0184] A second release spring disposed inside the other end of the packing (194) can press the other end of the packing (194) toward the fixing groove (192) to prevent one end of the packing (194) from being removed from the fixing groove (192).

[0185] As illustrated in FIG. 4, a through hole (152) having a catch (153) provided therein is formed in the mold (191), and a vacuum forming unit (190) may further include a stopper (154) that is arranged in the through hole (152) and coupled to the support unit (120) at one end, but is caught by the catch (153) at the other end as the mold (191) moves toward the filling space (280) by the second cylinder (198), thereby limiting the movement distance of the mold (191).

[0186] One end of a stopper (154) placed in a through hole (152) having a catch (153) provided therein is coupled to a support unit (120), and the other end of the stopper (154) is caught by the catch (153) as the mold (191) is moved toward the filling space (280) by the second cylinder (198), thereby limiting the movement distance of the mold (191) and also controlling the operating distance of the second cylinder (198).

[0187] The catch (153) can be provided by forming the through hole (152) in a shape in which two holes with different cross-sectional sizes are connected.

[0188] At this time, one end of the stopper (154) is formed to correspond to the shape of the hole with a relatively smaller cross-section among the two holes of the through hole (152), and the other end of the stopper (154) is formed to correspond to the shape of the hole with a relatively larger cross-section among the two holes of the through hole (152), so that it can be caught on the catch (153).

[0189] At least one of the pair of vacuum forming units (190) may further include an O-ring (199) disposed on the mold (191) and interposed between the pair of molds (191) as the pair of molds (191) move toward each other to prevent impact between the pair of molds (191) and to seal between the pair of molds (191) to maintain airtightness between the mold (191) and the resin material (210).

[0190] An O-ring (199) placed on at least one mold (191) of a pair of vacuum forming units (190) is interposed between the pair of molds (191) as the pair of molds (191) move toward each other, thereby preventing impact from occurring when the pair of molds (191) come into contact or collide, and also, since the space between the pair of molds (191) is sealed by the O-ring (199), airtightness between the mold (191) and the resin material (210) can be maintained.

[0191] After a vacuum state is formed between the mold (192) and the resin material (210), a pressurizing unit may be further included to pressurize a pair of resin container members (220) from both sides to prevent the occurrence of a gap in the filling space (280).

[0192] In a state where a vacuum state is formed between the mold (192) and the resin material (210), the pressurizing unit pressurizes a pair of resin container members (220) from both sides, thereby causing the resin material (210) to flow, thereby removing the gap between the resin material (210) and the fusion end (260) that may remain in the filling space (280).

[0193]

[0194] *

[0195] A resin container (200) according to one embodiment of the present invention will be described.

[0196]

[0197] *According to the present embodiment, as shown in FIGS. 12 to 21, etc., a resin container (200) is provided, which includes a pair of resin container members (220), and a coupling portion (240) interposed between the pair of resin container members (220) to couple the pair of resin container members (220) to each other, and the coupling portion (240) is formed by filling a molten resin material (210) into a filling space (280) formed between a pair of mutually opposing fusion ends (260) of a pair of resin container members (220) that are spaced apart from each other and curing the filling space (280).

[0198] According to this embodiment, resin containers (200) of various sizes from small to large can be provided, resin containers (200) with high fusion strength and fusion quality can be provided, and resin containers (200) with high manufacturing productivity can be provided.

[0199] Hereinafter, each component of the resin container (200) according to the present embodiment will be described with reference to FIGS. 12 to 21, etc., but with respect to the method and device for manufacturing the resin container (200) according to the present embodiment, the contents of the resin container manufacturing method and resin container manufacturing device (100) described above may be followed.

[0200]

[0201] The connecting portion (240) can be interposed between a pair of resin container members (220) to mutually connect the pair of resin container members (220), as shown in FIG. 12(a) and the like.

[0202] The joint (240) can be formed by filling a molten resin material (210) into a filling space (280) formed between a pair of opposing fusion ends (260) of a pair of resin container members (220) spaced apart from each other and hardening the filling space.

[0203] As shown in Fig. 12(b), a first protrusion (261) protruding from the outer surface of the filling space (280) side of the resin container member (220) and extending along the outer surface of the resin container member (220) may be provided at the fusion end (260).

[0204] The rigidity of the fusion end (260) can be increased through the first protrusion (261), the fusion area of ​​the fusion end (260) can be expanded to increase the fusion force, and shrinkage deformation that occurs as the resin material (210) hardens can be compensated for.

[0205] As shown in Fig. 12(a), the first protrusion (261) can be formed so that the protrusion length increases as it moves toward the filling space (280).

[0206] Accordingly, the rigidity of the fusion end (260) can be further increased.

[0207] As illustrated in FIG. 18(b), at least one of the pair of fusion ends (260) may be provided with a second protrusion (262) that protrudes from the end surface of the resin container member (220) toward the filling space (280) and extends in the circumferential direction of the resin container member (220) along the end surface of the resin container member (220).

[0208] The fusion force can be increased by expanding the fusion area of ​​the fusion end (260) through the second protrusion (262), and the resin material (210) can be filled well in the filling space (280) without flowing into the inside of the resin container member (220).

[0209] As shown in Fig. 18, the second protrusion (262) can be arranged to be biased toward the inside of the resin container member (220).

[0210] Accordingly, the fusion area of ​​the fusion end (260) can be expanded to increase the fusion strength, and the resin material (210) can be filled well in the filling space (280) without flowing into the inside of the resin container member (220).

[0211] As illustrated in FIG. 21, the second protrusion (262) provided on one of the pair of fusion ends (260) may be arranged to be biased toward the inside of the resin container member (220), and the second protrusion (262) provided on the other of the pair of fusion ends (260) may be arranged to be biased toward the outside of the resin container member (220).

[0212] Accordingly, the effect of ensuring that the resin material (210) does not flow into the inside of the resin container member (220) and is well filled in the filling space (280) can be enhanced.

[0213] As illustrated in FIG. 13, the second protrusion (262) may be formed to have a first inclined surface (263) that slopes toward the filling space (280) from the outside of the resin container member (220) toward the inside of the resin container (200).

[0214] Accordingly, the fusion area of ​​the fusion end (260) can be expanded to increase the fusion strength, and the resin material (210) can be filled well in the filling space (280) without flowing into the inside of the resin container member (220).

[0215] As illustrated in FIG. 14, the second protrusion (262) may be provided with a third protrusion (264) that protrudes from the first inclined surface (263) toward the filling space (280) and extends in the circumferential direction of the resin container member (220) along the first inclined surface (263), but is arranged to be biased toward the inside of the resin container member (220).

[0216] The fusion strength can be improved by expanding the fusion area of ​​the fusion end (260) through the third protrusion (264).

[0217] As illustrated in FIG. 16, the second protrusion (262) may be formed to further have a second inclined surface (265) that slopes toward the filling space (280) from the inside of the resin container member (220) to the outside of the resin container (200).

[0218] Accordingly, the fusion area of ​​the fusion end (260) can be expanded to improve the fusion strength, and the effect of ensuring that the resin material (210) is well filled in the filling space (280) without flowing into the inside of the resin container member (220) can be further enhanced.

[0219] As illustrated in FIG. 13, the second protrusion (262) provided on one of the pair of fusion ends (260) may be formed to have a first inclined surface (263) that slopes toward the filling space (280) while going from the outside of the resin container member (220) to the inside of the resin container (200), and the second protrusion (262) provided on the other of the pair of fusion ends (260) may be formed to have the first inclined surface (263) and further have a second inclined surface (265) that slopes toward the filling space (280) while going from the inside of the resin container member (220) to the outside of the resin container (200).

[0220] Accordingly, the fusion area of ​​the fusion end (260) can be expanded to improve the fusion strength, and the effect of ensuring that the resin material (210) is well filled in the filling space (280) without flowing into the inside of the resin container member (220) can be further enhanced.

[0221] As illustrated in FIG. 20, a second protrusion (262) provided on one of the pair of fusion ends (260) may be formed to have a first inclined surface (263) that is inclined toward the filling space (280) while going from the outside of the resin container member (220) to the inside of the resin container (200), and an indentation (266) that is recessed into the end surface of the resin container member (220) and extends in the circumferential direction of the resin container member (220) along the end surface of the resin container member (220) and has a third inclined surface (267) that is inclined toward the filling space (280) while going from the inside of the resin container member (220) to the outside of the resin container (200) may be provided on the other of the pair of fusion ends (260).

[0222] Accordingly, the fusion area of ​​the fusion end (260) can be expanded to improve the fusion strength, and the effect of ensuring that the resin material (210) is well filled in the filling space (280) without flowing into the inside of the resin container member (220) can be further enhanced.

[0223] As illustrated in FIG. 21, one of the pair of fusion ends (260) may be provided with a fourth protrusion (268) that extends along the inner surface of the resin container member (220) so as to be able to protrude from the inner surface of the resin container member (220) and cover the lower portion of the filling space (280).

[0224] By expanding the fusion area of ​​the fusion end (260) through the fourth protrusion (268), the fusion strength can be increased, and the resin material (210) can be filled well in the filling space (280) without flowing into the inside of the resin container member (220), and the filling amount of the resin material (210) can be increased.

[0225] The fourth protrusion (268) may include an extension (269) that protrudes from the inner surface of the resin container member (220) and extends toward the inside of the resin container member (220) so as to expand the filling space (280), and a cover (270) that is bent from the first extension and extends to cover the lower part of the filling space (280).

[0226] The cover part (270) may have an end positioned on the lower side of the inner surface of the other of the pair of fusion ends (260) as the pair of resin container members (220) are spaced apart from each other.

[0227] Accordingly, the fusion area of ​​the fusion end (260) can be expanded to improve the fusion strength.

[0228] The fourth protrusion (268) may further include a protrusion (271) that protrudes toward the outside of the resin container member (220) from the end of the second extension, but is spaced apart from the inner surface of the other one of the pair of fused ends (260) as the pair of resin container members (220) are spaced apart.

[0229] The fusion strength can be improved by increasing the fusion area of ​​the fusion end (260) through the protrusion (271), and the effect of ensuring that the resin material (210) does not flow into the inside of the resin container member (220) and is well filled in the filling space (280) can be further enhanced.

[0230] The protrusion (271) may be formed to have an inclined surface that slopes toward the inside of the other one of the pair of fusion ends (260) while going toward the inside of the other one of the pair of fusion ends (260) in the filling space (280).

[0231] By further increasing the fusion area of ​​the fusion end (260) through the inclined surface of the protrusion (271), the fusion strength can be further improved, and the effect of ensuring that the resin material (210) does not flow into the inside of the resin container member (220) and is well filled in the filling space (280) can be further enhanced.

[0232] The present invention is said to include all embodiments that can be formed according to the above-described contents and combinations thereof, and some of the embodiments can be confirmed through FIGS. 12 to 21.

[0233]

[0234] Above, one embodiment of the present invention has been described, but a person having ordinary skill in the art will be able to modify and change the present invention in various ways by adding, changing, deleting or adding components, etc., within the scope that does not depart from the spirit of the present invention described in the claims, and this will also be considered to be included within the scope of the rights of the present invention.

Claims

1. A support unit that supports a pair of resin container members spaced apart from each other; and A vacuum forming device including a vacuum forming unit that vacuum forms a resin material filled in a filling space formed between a pair of opposing fused ends of a pair of the above resin container members.

2. In paragraph 1, The above support unit is provided in pairs to support a pair of the above resin container members, The above vacuum forming unit, A vacuum forming device, which is provided in pairs and is combined with a pair of the above-mentioned support units, moves toward each other and is arranged on the filling space so as to vacuum-form the resin material.

3. In paragraph 2, The above vacuum forming unit, A mold placed on one side of the above support unit and forming the resin material with the lower forming surface; and A second cylinder is connected to the other side of the support unit, penetrates the support unit, and is connected to the mold to move the mold back and forth. At least one of the pair of said vacuum forming units, A vacuum forming apparatus further comprising a vacuum suction pipe arranged in the mold to form a vacuum state between the pair of molds and the resin material by sucking air in a space between the pair of molds and the resin material.

4. In paragraph 3, The above vacuum forming unit, A vacuum forming apparatus further comprising a packing disposed at the lower portion of the mold, which moves together with the mold as the mold is moved toward the filling space by the second cylinder, and is pressed toward the resin container member to adhere to the resin container member and maintain an airtight seal between the mold and the resin material.

5. In paragraph 4, The above support unit, A wedge-shaped pressure groove is formed on one end, The above packing is, A vacuum forming device in which one end is formed to correspond to the shape of the pressurizing groove and placed in the pressurizing groove, and as the mold is moved toward the filling space by the second cylinder, the one end is pressed toward the resin container member by the inclined surface of the pressurizing groove while moving together with the mold, thereby closely contacting the resin container member and maintaining an airtight seal between the mold and the resin material.

6. In paragraph 5, The above packing is, A vacuum forming device having a first separation prevention spring disposed at one end of the packing to press one end of the packing toward the pressurizing groove, so as to prevent one end of the packing from being separated from the pressurizing groove.

7. In paragraph 5, The above mold, A fixed groove with an upwardly bent shape is formed at the bottom, The above packing is, A vacuum forming device in which the other end is formed to correspond to the shape of the fixed groove and is placed in the fixed groove, and the other end is restrained between the fixed groove and the resin container member and moves together with the mold as the mold is moved toward the filling space by the second cylinder.

8. In paragraph 7, The above packing is, A vacuum forming device having a second separation prevention spring disposed at the other end of the packing to press the other end of the packing toward the fixing groove to prevent the other end of the packing from being separated from the fixing groove.

9. In paragraph 3, In the above mold, A through hole is formed with a catch provided inside, The above vacuum forming unit, A vacuum forming device further comprising a stopper arranged in the through hole and coupled to the support unit at one end, and limiting the movement distance of the mold by being caught on the catch at the other end as the mold is moved toward the filling space by the second cylinder.

10. In paragraph 3, At least one of the pair of said vacuum forming units, A vacuum forming apparatus further comprising an O-ring disposed on the mold and interposed between the pair of molds as the pair of molds move toward each other to prevent impact between the pair of molds and to seal between the pair of molds to maintain airtightness between the mold and the resin material.

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