Hinge cap

Abstract

To provide a hinge cap suppressed in breakage of a center hinge by controlling an occurrence position of a weldline generating in injection molding.SOLUTION: A hinge cap is formed by integrally injection molding a cap body 3 formed in a body cavity communicated with a filling gate, an upper lid part 6 formed inside an upper lid cavity, a center hinge 4 formed inside the center cavity forming a flow passage communicating the body cavity with the upper lid cavity, and a side hinge 5 formed inside a side cavity forming the flow passage communicating the body cavity with the upper lid cavity. The hinge cap has a speed control part 17 at a connection part of the cap body 3 and the side hinge 5. The speed control part 17 has a recessed part 18 provided to the cap body 3. A flow sectional area is reduced around a mold part corresponding to the recessed part 18 in injection molding time, forming a flow rate delay structure delaying inflow of molten resin flowing from the body cavity to the side cavity.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a hinge cap to be attached to a container, and relates to a technology that controls the position of weld lines that occur during injection molding and contributes to preventing damage to the hinge. [Background technology]

[0002] Conventionally, a hinge cap of this type is described, for example, in Patent Document 1. This hinge cap is molded using a molding die consisting of an upper mold part and a lower mold part, and comprises a cap body and a top lid connected via a hinge. The cap body has an engaging cylindrical part with an outer cylinder that fits into the cylindrical mouth of a container, and an outer cylindrical part that connects the hinge to its upper outer periphery, and the outer cylinder and outer cylindrical part are connected by a breakable weakened piece.

[0003] In this hinge cap, the weakened piece connecting the outer tube of the engaging cylindrical part of the cap body and the lower end of the outer cylindrical part is made small enough to be broken during molding, which narrows the resin flow path and impairs the flow of molten resin.For this reason, a flow path piece is formed that connects the outer surface of the engaging cylindrical part of the cap body to the inner surface of the outer cylindrical part, and serves as an auxiliary flow path for the molten resin during molding. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent Publication No. 2008-296980 Summary of the Invention [Problem to be solved by the invention]

[0005] For example, some hinge caps have enhanced hinge spring properties to allow the top lid to be opened and closed smoothly, and the cap body and top lid are connected by a center hinge and side hinges located on both sides of the center hinge. The center hinge is made longer than the side hinges, thereby enhancing the spring properties of the hinge.

[0006] This hinge cap is manufactured by injection molding the cap body, top cover, center hinge, and side hinges located on both sides of the center hinge as a single unit. During injection molding, the flow rate of the molten resin flowing through the side hinge cavity is faster than the flow rate of the molten resin flowing through the center hinge cavity of the mold, causing the molten resin flowing through the side hinge cavity to reach the top cover cavity before the molten resin flowing through the center hinge cavity. This can lead to weld lines forming where the molten resins flowing through the side hinge cavities on both sides meet within the top cover cavity. If this weld line forms at the base of the center hinge on the top cover side, opening the top cover can cause damage to the center hinge and other problems with the strength of the cap.

[0007] The present invention is intended to solve the above-mentioned problems, and aims to provide a hinge cap that can suppress damage to the center hinge by controlling the position of the weld line that occurs during injection molding. [Means for solving the problem]

[0008] In order to achieve the above object, the hinge cap of the present invention comprises a cap body molded in a body cavity communicating with a filling gate of a mold and attached to the mouth of a container; a top cover molded in a top cover cavity of the mold and detachable from the cap body; a center hinge molded in a center cavity of the mold forming a flow path connecting the body cavity and the top cover cavity and connecting the cap body to the top cover; and side hinges molded in side cavities of the mold forming flow paths connecting the body cavity and the top cover cavity, the side hinges being provided on both sides of the center hinge and having a volume smaller than that of the center hinge, and the hinge cap is provided with speed adjusting sections at the connection points between the cap body and each side hinge, the speed adjusting sections having recesses provided in the cap body, and a flow rate delay structure in which the flow path cross-sectional area is reduced around the mold parts corresponding to the recesses during injection molding, delaying the inflow of molten resin from the body cavity to the side cavities. None. The recess provided in the cap body corresponds to the base of the side hinge connected to the cap body, but is positioned so as not to be continuous with the base of the side hinge. The width between the inner surfaces of the recess facing each other in the circumferential direction of the cap body is formed narrower than the width between the both side surfaces of the side hinge facing each other in the circumferential direction of the cap body. It is characterized by:

[0012] In the hinge cap according to the present invention, the base of the side hinge connected to the cap body and the base of the center hinge connected to the cap body are located at different positions in the axial direction of the cap body, Provided on the cap body The recess is characterized by being formed deeper than the bottom surface of the base of the side hinge in the axial direction of the cap body. [Effects of the Invention]

[0014] As described above, with the hinge cap according to the present invention, the speed adjusting section has a flow rate delay structure, and the cross-sectional area of ​​the flow path in the mold cavity corresponding to the peripheral edge of the recess in the cap body is reduced, thereby delaying the inflow of molten resin from the main body cavity to the side cavities during injection molding. This delay time varies depending on the shape of the recess and can be controlled by adjusting the cross-sectional area of ​​the flow path around the recess, and is adjusted according to the shape and volume of the center hinge and side hinge.

[0015] By slowing down the inflow speed of the molten resin flowing into the side cavity during injection molding, it is possible to adjust the timing at which the molten resin flowing through the side cavity reaches the top cover cavity.

[0016] By adjusting this inflow timing, it is possible to set the inflow timing of the molten resin flowing through the side cavity to be equal to or later than the inflow timing of the molten resin flowing through the center cavity, thereby preventing the molten resin flowing through the side cavity from reaching the top cover cavity before the molten resin flowing through the center cavity.

[0017] As a result, the molten resin flowing through the side cavities on both sides does not meet at the base of the center hinge on the top cover side, preventing weld lines from forming at the base of the center hinge. This prevents damage to the center hinge and results in a hinge cap with no problems regarding hinge strength. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a top perspective view of a hinge cap according to an embodiment of the present invention; [Figure 2] FIG. 3 is a plan view showing the hinge cap according to the embodiment; [Figure 3] FIG. 3 is a cross-sectional view showing a main part of the hinge cap according to the embodiment. [Figure 4] FIG. 3 is a side view of the hinge cap according to the embodiment; [Figure 5] FIG. 10 is a bottom perspective view of the hinge cap according to the embodiment; [Figure 6] FIG. 10 is a rear view of the hinge cap according to the embodiment. DETAILED DESCRIPTION OF THE INVENTION

[0019] An embodiment of a hinge cap according to the present invention will be described below with reference to Figures 1 to 6. In Figures 1 to 6, the hinge cap 1 is formed by injection molding a cap body 3 that is attached to the mouth 2 of a container and a top lid 6 that is integrated with the cap body 3 via a center hinge 4 and a side hinge 5.

[0020] The cap body 3 has a main body 7 that surrounds the mouth 2 of the container around the axis of the container, and a top surface 8 that covers the opening of the mouth 2. The top surface 8 has a cylindrical discharge part 9, which has a discharge hole 10 that communicates between the inside and outside of the cap body 3. The discharge part 9 also has a drainer 11 that is annular around the axis of the cap body 3 at the opening edge of the discharge hole 10.

[0021] The top cover 6 has a flange 12 on its outer peripheral surface that extends radially outward from the top cover 6, and the flange 12 is located in a position facing the center hinge 4 in the radial direction of the top cover 6. The top cover 6 also has a plug 13 on its inner surface that is inserted into the discharge hole 10 of the discharge part 9.

[0022] The cap body 3 has a recess 15 for holding a finger on the outer circumferential surface at a position corresponding to the flange 13 of the upper lid portion 6.

[0023] The cap body 3 that is attached to the mouth 2 of the container is molded in a body cavity that communicates with the filling gate of the mold. In the figure, the gate mark 16 corresponds to the filling gate. The top lid 6 that is attached to and detached from the cap body 3 is molded in the top lid cavity of the mold. The center hinge 4 that connects the cap body 3 and the top lid 6 is molded in the center cavity of the mold, which forms a flow path that connects the body cavity and the top lid cavity. The side hinge 5 is molded in a side cavity of the mold, which forms a flow path that connects the body cavity and the top lid cavity.

[0024] The side hinges 5 are shaped to extend from the outer peripheral surface of the cap body 3 to the outer peripheral surface of the top lid 6, and the center hinge 4 is shaped to extend from the outer peripheral surface of the cap body 3 to the center of the top lid 6. The length of the center hinge 4 from the cap body 3 to the top lid 6 is longer than the length of the side hinges 5 from the cap body 3 to the top lid 6.

[0025] The width between the opposing side surfaces of the side hinge 5 in the circumferential direction of the cap body 3 is narrower than the width between the opposing side surfaces of the center hinge 5 in the circumferential direction of the cap body 3, and the side hinge 5 has a volume smaller than the volume of the center hinge 4.

[0026] A speed adjusting section 17 is provided at the connection portion between the cap body 3 and each side hinge 5. The speed adjusting section 17 has a recess 18 provided in the cap body 3. The recess 18 corresponds to the base of the side hinge 5 that connects to the cap body 3, and is located at a position that is not continuous with the base of the side hinge 5. With this configuration, the speed adjusting section 17 forms a flow rate retarding structure, and the flow path cross-sectional area is reduced around the mold portion that corresponds to the recess 18 during injection molding, that is, in the mold cavities that correspond to the peripheral portions 18a, 18b, and 18c of the recess 18 of the cap body 3, and the inflow of molten resin from the main body cavity to the side cavities is retarded.

[0027] The recess 18 is formed so that the width between the inner side surfaces of the recess that face each other in the circumferential direction of the cap body 3 is narrower than the width between both side surfaces of the side hinges 5 that face each other in the circumferential direction of the cap body 3. The bottom surface of the recess 18 in the axial direction of the cap body 3 is formed deeper than the bottom surface of the base of the side hinge 5 in the axial direction of the cap body 3. Furthermore, the base of the side hinge 5 connected to the cap body 3 and the base of the center hinge 4 connected to the cap body 3 are at different positions in the axial direction of the cap body 3.

[0028] As described above, according to the hinge cap 1 of this embodiment, the speed adjustment section 17 has a flow rate retarding structure, and the cross-sectional area of ​​the flow path through which the molten resin flows around the recess 18 is reduced, thereby delaying the flow of molten resin from the main cavity to the side cavity during injection molding.

[0029] The delay time due to the flow rate delay structure of the speed adjusting unit 17 varies depending on the shape of the recess 18, and can be controlled by adjusting the cross-sectional area of ​​the flow path around the recess 18, and is adjusted according to the shape and volume of the center hinge 4 and the side hinge 5. The shape of the recess 18 is not limited to a cube or rectangular parallelepiped, and various shapes such as a polygonal prism or sphere can be used.

[0030] The flow rate delay structure slows the inflow rate of the molten resin flowing through the side hinge cavity during injection molding, making it possible to adjust the inflow timing at which the molten resin flowing through the side hinge cavity reaches the top cover cavity.

[0031] By adjusting this inflow timing, it is possible to set the inflow timing of the molten resin flowing through the side cavity to be equal to or later than the inflow timing of the molten resin flowing through the center cavity, thereby preventing the molten resin flowing through the side cavity from reaching the top cover cavity before the molten resin flowing through the center cavity.

[0032] This prevents the molten resin flowing through the side cavities from joining together in the top cover cavity at the base of the center hinge on the top cover side, preventing weld lines from forming at the base of the center hinge. As a result, damage to the center hinge is suppressed, resulting in a hinge cap with no problems regarding hinge strength.

[0033] In the above-described embodiment, a configuration has been exemplified in which the main body cavity that molds the cap main body 3 is connected to the filling gate of the mold, but the present invention can also be realized with a configuration in which the filling gate of the mold is connected to the top cover cavity of the mold that molds the top cover portion 6.

[0034] In this case, a speed adjusting section 17 forming a flow rate retarding structure is provided at the connection portion between the top cover portion 6 and each side hinge 5. The recessed portion 18 is disposed in a position corresponding to the base of the side hinge 5 connected to the top cover portion 6, but not contiguous with the base of the side hinge 5. The width between the inner surfaces of the recessed portion opposing each other in the circumferential direction of the top cover portion 6 is narrower than the width between the two side surfaces of the side hinges 5 opposing each other in the circumferential direction of the top cover portion 6. The bases of the side hinges 5 connected to the top cover portion 6 and the base of the center hinge 4 connected to the top cover portion 6 are located at different positions in the axial direction of the top cover portion 6. The recessed portion 18 is also formed deeper than the bottom surfaces of the bases of the side hinges 5 in the axial direction of the top cover portion 6. Other functions and effects are the same as those of the previous embodiment, and therefore description thereof will be omitted. [Explanation of symbols]

[0035] 1 cap 2. Mouth of container 3 Cap body 4 Center Hinge 5 Side hinge 6 Top lid 7 Main body 8 Top section 9 Discharge part 10 Discharge hole 11 Drainer 12 Tsuba section 13 Plug body 15 recess 16 Gate Remains 17 Speed ​​adjustment section 18 Recess 18a, 18b, 18c Periphery

Claims

1. a cap body molded in a body cavity communicating with a filling gate of the mold and attached to the mouth of a container; an upper cover molded in a top cover cavity of the mold and detachable from the cap body; a center hinge molded in a center cavity of the mold forming a flow path connecting the body cavity and the top cover cavity and connecting the cap body to the top cover; and side hinges molded in side cavities of the mold forming flow paths connecting the body cavity and the top cover cavity and provided on both sides of the center hinge, the volume of which is smaller than the volume of the center hinge, and which are integrally injection molded; The cap body has a speed adjusting section at the connection point between the cap body and each side hinge, The speed adjusting section has a recess provided in the cap body, and during injection molding, the flow path cross-sectional area is reduced around the mold part corresponding to the recess, forming a flow speed delay structure that delays the inflow of molten resin flowing from the main cavity to the side cavity; A hinge cap characterized in that the recess provided in the cap body corresponds to the base of the side hinge connected to the cap body, but is positioned at a position not continuous with the base of the side hinge, and the width between the inner surfaces of the recess facing each other in the circumferential direction of the cap body is formed narrower than the width between the both side surfaces of the side hinge facing each other in the circumferential direction of the cap body.

2. The base of the side hinge connected to the cap body and the base of the center hinge connected to the cap body are located at different positions in the axial direction of the cap body, 2. The hinge cap according to claim 1, wherein the recess provided in the cap body is formed deeper than the bottom surface of the base of the side hinge in the axial direction of the cap body.

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