JP2009286013A - Method of integrating flexible mesh member with container or frame body by insert molding - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a general method of preventing a mesh member from being deformed by a flow of a fused resin along a frame body, when integrating the very flexible mesh member, with a container or the frame body made of a synthetic resin having an opening part such as an inner lid of a powdery cosmetic container, by insert molding. <P>SOLUTION: The flow of the fused resin along an upper face of a lower side half of a molding die is restrained by providing preliminarily an irregular shape, for example, a large number of radial ribs, in a portion overlapped with the mesh member in the periphery of the opening part out of the molds constituting a molding die, in a molding method of mounting preliminarily the flexible mesh member in an inside a cavity of the container 1 or frame body having the opening part, of injection-filling the fused resin, and of extension-laying the mesh member to coat the opening part of the container or frame body. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a container having an opening and a method of stretching a flexible mesh member on a frame body installed in the container, and in particular, a molten resin in a mold for manufacturing an inner lid of a powder cosmetic container. The present invention relates to a method of insert molding in which tensioning is performed by placing a flexible mesh member in advance in the molding die when molding by injection filling.

Conventionally, in powdered cosmetic containers and the like, powder cosmetics are stored in a powder container body that is open at the top, and a mesh body is placed thereon so that it can be moved up and down. What wiped out powder cosmetics stored in a container so that an appropriate amount can be taken out has been used. Japanese Patent Application Laid-Open No. 2005-224398 has a structure in which a net is stretched on a hollow frame and placed on the surface of the powder cosmetic, and a frame that is in sliding contact with the inner surface of the container is provided on the outer periphery of the frame. Disclosure.
JP 2005-224398 A

Conventionally, in order to mold a mesh stretched body, conventionally, in order to reduce assembly costs, a mesh member is placed in advance in a mold cavity for molding a container or a frame, and then a mold injection port Then, a molten resin is injected and filled into the cavity, and a frame is molded around the mesh member to stretch the mesh.
JP-A-5-65105

Japanese Patent Application Laid-Open No. 2004-202983 discloses a technique for embedding and holding an edge portion of a sheet member by insert molding in order to hold the mesh-like sheet-like member in a tensioned state in the frame. Has been. Specifically, it is described that the molten resin is injected outside the edge of the sheet-like member to prevent the sheet-like member from being pushed into and stuck to the lower surface of the frame.
JP 2004-202983 A

  Recently, a flexible mesh member with improved stretchability has been stretched over the inner lid so that it can reach the bottom of the container by ingenuity in the material and knitting method. A technique has been proposed in which the powder can be taken out by pressing the center part downward and deforming it until it reaches the powder.

  When the mesh member is stretched on the inner lid, if the elasticity of the mesh member is small, the insert molding method described in Japanese Patent Laid-Open Nos. 5-65105 and 2004-202983 can be used. However, it has been found that inconvenience is caused when the mesh member having enhanced elasticity as described above is stretched on the inner lid. That is, even if the vertical position of the mesh member is prevented by adjusting the position of the injection port in the vertical cross section, the mesh member can be moved from the injection port to other parts along with the flow of the molten resin along the frame. Since each strip constituting the mesh body easily moves in the circumferential direction, the mesh network may become wrinkled or wrinkled without maintaining a state along the plane of the frame. is there. Even if a part of the mesh member is fixed with a mold or a pin, the mesh structure of the mesh member can be easily deformed, so that partial deformation cannot be prevented, which is not an effective fixing method.

  It is an object of the present invention to follow the flow of molten resin along a frame when insert molding is performed by placing a flexible mesh member in advance in a mold for manufacturing the inner lid of a powder cosmetic container. Another object of the present invention is to provide a molding method capable of preventing the movement of the strips of the mesh member and the deformation of the network structure.

  Another object of the present invention is to deform a mesh member due to the flow of molten resin along the frame when an extremely flexible mesh member is integrally molded by insert molding into a synthetic resin container or frame having an opening. Is to provide a general way to prevent.

  The method according to claim 1, wherein a flexible mesh member is mounted in advance in a cavity of a container or a frame having an opening, and molten resin is injected and filled so as to cover the opening of the container or the frame. In the molding method in which the mesh member is stretched, the above-described molding method is characterized in that unevenness is provided in advance in a portion of the mold constituting the molding die that overlaps the mesh member around the opening. Solve the problem.

  The mesh member is a network structure composed of thin strips, and it is not easy to directly fix the mesh member even if pins or irregularities are provided on the mold. However, since the molten resin injected from the injection port easily enters the mesh of the mesh member and comes into contact with the upper surface of the lower mold, unevenness is provided on this surface to reduce the speed at which the molten resin flows along the frame. By doing so, it was found that the flexible mesh member strip can be prevented from moving together with the molten resin and distorting the network.

  The unevenness provided in the portion of the cavity overlapping the mesh member can be formed by, for example, embossing. The embossing is a technique in which an inner surface of a cavity is previously roughened by etching or sandblasting, and injection molding is performed using the mold. Originally, it is intended to give a soft or calm appearance and feel by forming unique irregularities consisting of fine irregularities on the surface of the molded product. By applying to the part which overlaps with a mesh member, the flow of the molten resin along the metal mold | die surface can be suppressed, and the movement of a mesh member can be prevented effectively.

  The method according to claim 2 is characterized in that, in the method according to claim 1, a plurality of radial ribs are provided in a portion of the mold that overlaps the mesh member around the opening as unevenness to prevent the flow of the molten resin. It is what. In other words, by providing radial ribs, the annular frame is divided into a number of arc-shaped parts, and the molten resin that has entered therein is held together with the mesh member, so that the flow of the molten resin along the mold surface is maintained. It can suppress and can prevent the movement of a mesh member effectively.

  The method according to claim 3 is a synthetic resin container or frame manufactured by the molding method according to claim 1 or 2, and has an opening covered with a mesh member. A portion that overlaps the mesh member around the opening has an uneven shape.

  Hereinafter, specific embodiments of the present invention will be described with reference to the drawings.

  An embodiment of the present invention will be described with reference to FIGS. FIG. 1 is an exploded perspective view of a compact cosmetic container including an inner lid in which a mesh is stretched by the stretching method of the present invention. A powder cosmetic 2 is housed inside a transparent bottomed cylindrical container body 1 having an open upper surface. An inner lid 3 in which a flexible mesh member is stretched on an annular frame is fitted and fixed to the upper surface opening of the container body 1. Further, a screw thread is provided on the upper outer surface of the container body 1, and the outer lid 4 is fitted by screwing. The user turns the outer lid 4 to open the container, and wipes it with a puff from the mesh, thereby taking out an appropriate amount of the powder cosmetic contained in the container and using it.

  FIG. 2 is a longitudinal sectional view of the outer peripheral portion of the inner lid 3 fixed to the upper surface of the container body 1. The inner lid 3 includes a frame body 5 made of a soft synthetic resin and a mesh member 6 composed of a flexible network structure. The outer surface of the substantially cylindrical frame main body 5a is slightly smaller in diameter than the inner surface of the container main body 1, and the upper portion spreads outward to form a collar portion 5b that is held in contact with the outer peripheral upper end of the container main body 1. The lower portion extends inward to form an edge 5c for tensioning the mesh member. The frame 5 is made of a soft synthetic resin, and is easily fitted and fixed to the mouth of the container body 1 made of a hard synthetic resin. A large number of radial grooves 5d are formed at equiangular intervals on the lower surface of the edge portion 5c, and a mesh member 6 is stretched along the lower surface of the edge portion 5c to cover the lower opening of the inner lid 3. ing.

  FIG. 3 is a longitudinal sectional view of a mold 10 used to stretch and integrate the mesh member 6 by insert molding when the synthetic resin frame 5 of FIG. 2 is injection-molded. The molds are a cylindrical central upper mold 11 and a central lower mold 12, and a ring-shaped peripheral upper mold 13 and a lower peripheral so as to surround a cavity C processed in accordance with the shape of the frame 3 to be molded. It consists of a mold 14. The center upper mold 11 is provided with an injection port 11a for injecting and filling the molten resin into the cavity C. However, the injection port 11a is not limited to the position shown in the figure, but at another position in the cross section. There may be. A gap of about 0.1 mm is provided between the surrounding upper mold 13 and the surrounding lower mold 14, and the synthetic resin that has entered the gap and solidified after molding is formed on the edge of the upper surface 12 of the central lower mold 12. A jaw portion 12a for cutting is also provided. A large number of short radial ribs 12b are provided on the upper surface 12 of the central lower mold 12, and the mesh member 6 fed from a supply means (not shown) is placed thereon.

  4 is a cross-sectional view of the cavity C corresponding to the AA cross section of FIG. 3 across the edge 5c of the frame 5. As shown in FIG. In the injection molding, since the trace of the injection port into which the molten resin is injected remains on the surface of the frame body, it is better that the number of injection ports is small in terms of the appearance and cost of the product. Therefore, in this embodiment, the injection port 11a is provided in the central upper mold 12 facing two places 180 ° apart on the circumference of the frame body 5, and the molten resin injected from the injection port 11a is indicated by an arrow in the figure. As it is, it goes around to the other part along the circumference of the frame 5. The number of injection ports 11a is not limited to two and may be one or three or more. On the lower surface of the cavity C, the arrangement of the ribs 12b provided on the upper surface 12 of the central upper mold 12 is shown. In this embodiment, the length of each rib 12a is about 3.5 mm, the width is 1 mm, and the height is about 1 mm with respect to the width 6 mm of the edge 5c. Each rib is arranged at intervals of 6 ° with respect to the center of the inner lid, and the interval between adjacent ribs is about 3 mm.

  In this embodiment, the procedure for installing the mesh member 6 in the mold 10 will be described. First, the central lower mold 12 and the peripheral lower mold 14 are set, and the mesh member 6 is fed out from a supply means (not shown) to cover the entire cavity C. To be placed. At this time, the periphery of the mesh member 6 protrudes outward from the central lower mold 12. When the upper peripheral mold 13 is set from above in this state, the portion of the mesh member 6 that protrudes around the cavity C is sandwiched and held between the peripheral upper mold 13 and the lower peripheral mold 14. In this embodiment, the contact surfaces of the upper peripheral mold 13 and the lower peripheral mold 14 are flat surfaces, but a biting structure for tensioning the mesh member 6 can be provided as appropriate.

  Next, when the central upper mold 11 is set from above, the center portion of the mesh member 6 is sandwiched and fixed between the lower surface of the central upper mold 11 and the upper surface of the central lower mold 12, and the entire cavity C is formed. . When the molten resin 6 is injected and filled into the formed cavity C through the injection ports 11a provided at two locations of the central upper mold 11, the molten resin 6 flows from the position of the injection port 11a to both sides as shown by arrows in FIG. , The whole is filled while wrapping around the cavity C in an annular shape.

  FIG. 5 is an explanatory view showing the arrangement of the mesh member 6 and the flow of the molten resin in a longitudinal section passing through the BB of the mold shown in FIG. While the molten resin P injected from the left side of the figure flows toward the right side, the mesh member 6 placed on the upper surface of the central lower mold 12 and the rib 12b is pressed downward, and at the same time, the mesh of the mesh member 6 is easy. And enters the portion sandwiched between the two front and rear ribs 12b, where it stops together with the mesh strip. Since there is a rib 12b in the traveling direction, the molten resin P cannot move any more along the lower surface of the cavity C. Therefore, while the flow of the molten resin injected later along the cavity C continues, the molten resin integrated with the mesh strip is held in place and cooled to form the lower surface of the frame 5. Therefore, the network structure of the mesh member 6 is not disturbed and wrinkles can be avoided.

  After the frame body 5 is molded in this way, the central upper mold 11 is moved upward and removed, and when the central lower mold 12 is protruded upward, the portion of the mesh member 6 that protrudes around the cavity is Along with a part of the synthetic resin solidified between the mold 13 and the lower peripheral mold 14, it is cut off by the jaw 12b around the central lower mold 12. Thereby, since the edge of the mesh member 6 and the edge of the frame 5 are aligned, it is possible to prevent the fibers of the mesh member 6 from jumping out from the edge of the frame 5 to impair the appearance of the product. You may make it the circumference | surroundings of the mesh member 6 cut off with a cutter after shaping | molding. Further, instead of continuously feeding out the mesh member, the mesh member 6 punched in advance in a circle may be arranged in the mold.

  According to the molding method of the present embodiment, the flexible mesh member 6 is fixed between the ribs 12b so as to be embedded in the lower surface of the molten resin P, and the overall network and planar state are maintained, The entire opening of the frame body 5 is covered and stretched. Therefore, the inner lid 3 that is preferable in terms of function and appearance can be obtained.

  In the present embodiment, the case where the molding method of the present invention is applied to the tensioning of the mesh member to the inner lid of the powder cosmetic container has been described. It can be widely used as a method for integrating extremely flexible mesh members by insert molding.

  As described above, according to the mesh tensioning method of the present invention, mass production by insert molding is possible even when a very flexible mesh member is tensioned on the inner lid in the production of a powder cosmetic container or the like. Therefore, it is possible to manufacture a product of constant quality that is superior in function and appearance at a low cost, and has great industrial applicability.

The disassembled perspective view of the compact container for makeup | decoration provided with the inner cover which tensioned the mesh by the tensioning method of this invention The longitudinal cross-sectional view of the outer peripheral part of the inner cover which concerns on an Example 2 is a longitudinal sectional view of a mold used for molding the inner lid of FIG. Cross-sectional view of cavity C corresponding to plane AA in FIG. Explanatory drawing which shows arrangement | positioning of the mesh member 6 in the BB cross section of FIG. 4, and the flow of molten resin P

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Container main body 2 Powder cosmetics 3 Inner lid 4 Outer lid 5 Frame body 5a Frame main body 5b Collar part 5c Edge part 6 Mesh member 10 Mold 11 Center upper mold | type 11a Injection port 12 Center lower mold | type 12a Jaw part 12b Rib 13 Upper circumference Mold 14 Lower die C Cavity P Molten resin

Claims (3)

A molding method in which a flexible mesh member is mounted in advance in a cavity of a container or a frame having an opening, a molten resin is injected and filled, and the mesh member is stretched so as to cover the opening of the container or the frame In the method, unevenness is provided in advance in a portion of the mold constituting the mold that overlaps the mesh member around the opening. The method according to claim 1, wherein the concave and convex portions are ribs provided in a large number radially on a portion of the mold that overlaps the mesh member around the opening. A synthetic resin container or frame having an opening covered with a mesh member, wherein a portion overlapping the mesh member around the opening of the container or the frame has an uneven shape. Container or frame.

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