JP5260102B2 - Mold for forming tube container, method for forming tube container, and tube container - Google Patents

Description

  The present invention relates to a synthetic resin tube container mold formed in a polygonal column shape, a tube container molding method, and a tube container.

  Patent Document 1 is known as a tube container having a polygonal cross-sectional shape and a shoulder plane shape of a body part, which can easily align the body part and the shoulder part. Yes.

  In patent document 1, the cross-sectional shape of the trunk | drum of a tube container is a polygon, and the ridgeline is suspended by the outer surface. Out of the corners of the inner surface of the upper end surface of the body part, alignment projecting pieces are projected from both left and right end parts, and are vertically provided over the entire length of the body part. On the other hand, the planar shape of the shoulder portion is also a polygonal shape similar to that of the trunk portion, and the corner portion of the outer edge of the shoulder portion is matched with the corner portion of the inner surface of the upper end portion of the trunk portion.

When forming the tube container, first, a polygonal cylinder with protrusions is formed by extrusion in advance, and this is cut into a predetermined dimension to form a barrel forming polygonal cylinder. When printing on the outer surface of the body part, a protruding piece is inserted into the groove on the surface of the roller as a printing jig, and the body forming polygonal tube is fitted to the outer surface of the roller, Printing was performed after the cylinder was elastically deformed into a cylindrical shape having the same inner diameter as the outer shape of the roller, thereby making it possible to prevent printing misalignment. Further, when the shoulder member is welded to the upper end of the barrel forming polygonal cylinder, a guide groove is provided in the mandrel and the fitting cylinder, and the alignment protrusion is fitted into the guide groove, whereby the barrel It was possible to align the shoulder and the shoulder, and prevented the displacement when welding the shoulder to the trunk.
No. 7-8432

  By the way, in the said prior art, at the time of shaping | molding of the tube container which consists of the tube main body as a trunk | drum, and the neck part which has a shoulder part, the tube main body was formed in polygonal shape at the formation process of the tube main body. For this reason, in the printing process of the outer surface of the tube main body, the polygonal tube main body must be elastically deformed using a printing jig to form a cylindrical shape before performing a printing operation. In addition, there is an unreasonable fact that the alignment groove and the protruding piece must be formed respectively. Also, in the process of welding the shoulder portion of the neck to the tube body, in order to make the corner portion of the tube body and the corner portion of the shoulder portion coincide with each other, the alignment protrusion is applied to the tube body and the mandrel for forming the neck portion. There was an inconvenience that a piece and a groove had to be provided respectively. Accordingly, there are problems that the work process is complicated and the manufacturing cost is increased.

  The present invention was devised in view of the above-described conventional problems, and can be used to simplify each work process by a simple method and reduce the manufacturing cost of a polygonal tube container molding die. An object of the present invention is to provide a tube container forming method and a tube container.

  A mold for a tube container according to the present invention is a mold for tube container molding in which a neck portion of a synthetic resin is injection-molded at an upper end portion of a tube body, and the mold is a cavity for molding an outer peripheral surface of the neck portion. A mold, a polygonal columnar core mold having a plurality of side ridges to form an inner peripheral surface of the neck in a polygonal shape, and a ridge line portion extending from the neck into the tube body. And a groove portion that is appropriately cut from the upper end of the ridge portion.

  Further, the tube container molding method according to the present invention is such that a molten resin is injected into a neck molding space defined by a mold composed of a cavity mold and a core mold, so that the upper end of the tube body mounted on the core mold is injected. A method of forming a tube container in which a neck portion is formed on a portion, wherein the core mold is formed in a polygonal column shape having a plurality of side ridge portions, and a groove portion is engraved on the side ridge portion with an appropriate length from its upper end. Thus, a ridge line forming space is formed between the core mold and the cavity mold so as to communicate with the neck forming space, and the core body is attached to the core mold and melted into the neck forming space. A resin is injected to form a neck portion at the upper end portion of the tube body, and a ridge line portion is formed on the inner surface of the tube body by molten resin flowing into the ridge line formation space from the neck forming space. To do.

Further, the tube container according to the present invention is configured such that a molten resin is injected into a neck molding space defined by a mold including a cavity mold and a core mold, so that a neck portion is formed on an upper end portion of a tube body attached to the core mold. Is formed into a polygonal column having a plurality of side ridges using the above tube container forming mold and using the above tube container forming method. Then, by engraving the side ridge part with a groove having an appropriate length from the upper end thereof, the ridge line part molding space is formed between the core mold and the cavity mold to communicate with the neck part molding space, With the tube body mounted on the core mold, molten resin is injected into the neck molding space to mold the neck at the upper end of the tube body and flow into the ridge line molding space from the neck molding space. The tube is made of molten resin Characterized in that shaping the ridge portion in the body side.

  With the mold for forming a tube container, the method for forming the tube container, and the tube container according to the present invention, each work process can be simplified and the manufacturing cost can be reduced by a simple method.

  A preferred embodiment of a mold for forming a tube container according to the present invention will be described below in detail with reference to the accompanying drawings. A mold 10 for molding a tube container 1 according to the present invention is a mold 10 for molding a tube container 1 in which a neck portion 4 of a synthetic resin is injection-molded on an upper end portion 3 a of a tube body 3. A cavity mold 30 that molds the outer peripheral surface of the neck 4, a polygonal column-shaped core mold 20 having a plurality of side ridges 21 to form the inner peripheral surface of the neck 4 in a polygonal shape, and the tube 4 from the neck 4 In order to extend the ridge line part 5, a groove part 22 is provided with an appropriate length from the upper end of the side ridge part 21.

  The mold 10 for forming the tube container 1 is made of a synthetic resin including a shoulder 7 that closes the opening of the upper end 3 a of the tube body 3 and an extraction port 6 that is formed by protruding from the center of the shoulder 7. A mold for injection-molding the neck 4, and includes a core mold 20 and a cavity mold 30 as shown in FIG. 1.

  The core mold 20 is formed in such a size that the cylindrical synthetic resin tube body 3 having flexibility is attached in close contact. Further, the core mold 20 is formed in a polygonal column shape having a plurality of side ridges 21 in order to form the inner peripheral surface of the shoulder 7 in a polygonal shape. Here, being formed into a polygonal column having a plurality of side ridges 21 means that the side ridges 21 are provided over the entire length in the vertical direction of the core mold 20 and the entire core mold 20 is not formed into a polygonal column. The polygonal columnar shape may be used as long as the side ridge portion 21 is formed in a range where at least a groove portion 22 described later is engraved from the upper end of the core mold 20.

  In the present embodiment, as shown in FIG. 2, the core mold 20 is formed in a horizontally long hexagonal column shape having six side ridges 21 over the entire length in the vertical direction. Specifically, the planar outer shape of the core mold 20 is such that the back side 24a and the front side 24b opposite to this are the same length and are longer than the other four sides. The four sides are also formed in a horizontally long hexagonal shape having the same length. Under the core mold 20, a pedestal 23 is formed integrally therewith. The pedestal 23 is formed in a columnar shape having a diameter larger than that of the core mold 20 so that the lower end of the tube main body 3 abuts on the tube main body 3 when the tube main body 3 is mounted and determines the mounting position of the tube main body 3 in the vertical direction. The outer shape of the core mold 20 is not limited to a horizontally long hexagonal column shape, and may be a regular hexagonal column shape, or may be formed in any shape as long as it is a polygonal column shape such as a square column shape.

  The side ridge portion 21 is provided with a groove portion 22 having an appropriate length from its upper end. In this embodiment, the groove part 22 is engraved on the upper side, which is from the upper end of the side ridge part 21 to a position slightly below the vertical center. However, the length of the groove portion 22 relative to the side ridge portion 21 may be any length, and may be engraved on the entire side ridge portion 21 from the upper end to the lower end.

  The cavity mold 30 is provided so as to cover the outer periphery of the core mold 20 in order to mold the outer peripheral surface of the neck portion 4. The cavity mold 30 may be a single part or a plurality of parts. In the present embodiment, as shown in FIG. 1, the cavity mold 30 is formed in a split mold form consisting of four parts. Specifically, by being linked to the core mold 20, a first cavity mold 31 that forms the spout portion 6 of the neck 4 of the tube container 1 and a lower part of the first cavity mold 31 are provided, and an extraction port portion A second cavity mold 32 for molding the outer peripheral thread portion 6a, and a tube body 3 provided below the second cavity mold 32 to mold the shoulder 7 of the neck 4 and attached to the core mold 20. A third cavity mold 33 that covers the upper end 3a of the tube, and a lower cavity of the third cavity mold 33, and together with the third cavity mold 33, the outer periphery of the tube body 3 is covered to form the ridge 5 on the tube body 3. And a fourth cavity mold 34.

  The first cavity mold 31 is formed with two runners 31a that communicate with each other from the upper side to the lower side. The inner side of the second cavity mold 32 is recessed in a screw shape so as to form the screw portion 6a. The inside of the third cavity mold 33 is recessed in a horizontally long hexagonal shape similar to that of the core mold 20 in order to form a planar external shape of the shoulder 7 in a horizontally long hexagonal shape. The inner side of the fourth cavity mold 34 has a diameter that is substantially the same as that of the core body 20 so that the tube body 3 attached to the core mold 20 is fixed. It is recessed in the shape.

  The first to fourth cavity molds 31, 32, 33, and 34 are sequentially stacked on the core mold 20 and are in close contact with each other, so that an injection molding space 40 is defined between the core mold 20 and the cavity mold 30. Is done. The injection molding space 40 is formed in communication with the runner 31 a in order to allow the molten resin 2 to flow from the runner 31 a formed in the first cavity mold 31. The injection molding space 40 includes a neck part molding space 41 and a ridge line part molding space 42. The neck forming space 41 is defined by the upper end portion of the core mold 20 and the first to third cavity molds 31, 32, 33. The ridge line portion forming space 42 covers the core mold 20 fitted with the tube body 3 with the third to fourth cavity molds 33, 34, so that the space between the groove portion 22 of the core mold 20 and the inner surface of the tube body 3 is formed. Defined. Further, the ridge line portion forming space 42 is formed in communication with the neck portion forming space 41 so that the molten resin 2 flows from the neck portion forming space 41.

  Next, a method for forming the tube container 1 according to the present embodiment will be described below. The tube container 1 according to the present embodiment is basically formed by injecting molten resin 2 into a neck molding space 41 defined by a mold 10 including a core mold 20 and a cavity mold 30, thereby providing a core. A method for forming a tube container 1 in which a neck portion 4 is formed on an upper end portion 3a of a tube body 3 mounted on a die 20, wherein the core die 20 is formed in a polygonal column shape having a plurality of side ridges 21, and the side ridges are formed. The groove portion 22 is engraved in the portion 21 to an appropriate length from the upper end thereof, so that the ridge line portion forming space 42 is formed between the core die 20 and the cavity die 30 so as to communicate with the neck portion forming space 41. 20 with the tube body 3 attached, the molten resin 2 is injected into the neck molding space 41 to form the neck 4 at the upper end 3a of the tube body 3 and into the ridge line molding space 42 from the neck molding space 41. Molten resin 2 More, forming the ridge portion 5 to the tube body 3 inside surface.

  FIG. 3 shows a tube main body 3 having a surface printed. The tube body 3 is made of a synthetic resin having flexibility, is formed into a cylindrical shape by extrusion molding, and is cut into a predetermined length. For example, as shown in FIG. 3A, the cut tube body 3 is printed by a known printing method such as offset printing or silk screen printing.

  The tube body 3 on which the printing has been performed is mounted on the core mold 20 described above from above. When the tube body 3 is mounted, the tube body 3 is mounted at a position where the lower end of the tube body 3 contacts the pedestal 23.

  The first to fourth cavity molds 31, 32, 33, and 34 are sequentially overlapped and adhered to the core mold 20 to which the tube body 3 is attached. Thereby, as shown in FIG. 1, an injection molding space 40 is defined between the core mold 20 and the cavity mold 30 so as to communicate with the runner 31a. Specifically, the neck molding space 41 is communicated between the upper end of the core mold 20 and the first to third cavity molds 31, 32, 33 to a runner 31 a formed in the first cavity mold 31. Furthermore, a ridge line portion forming space 42 is formed between the groove portion 22 of the core mold 20 and the tube body 3 covered with the fourth cavity die 34 so as to communicate with the neck portion forming space 41.

  Next, as shown in FIG. 4, the molten resin 2 is injected into the injection molding space 40 from the runner 31a. The injected molten resin 2 flows from the runner 31a into the neck forming space 41, whereby the neck 4 is formed at the upper end of the tube container 1. Further, the molten resin 2 flows from the neck forming space 41 into the ridge line forming space 42 inside the tube main body 3, whereby the ridge line 5 is formed integrally with the neck 4 inside the tube main body 3. The

  When the molten resin 2 is solidified, the first cavity mold 31, the second cavity mold 32, the third cavity mold 33, and the fourth cavity mold 34 are opened from the core mold 20 as shown in FIG. Take out the tube body 3.

  FIG. 6 is a side view showing the tube body 3 with the neck 4 taken out from the mold 10. 7A is a plan view of the tube main body 3 shown in FIG. 6, FIG. 7B is a partial cross-sectional view of FIG. 6, and FIG. 7C is an x-axis of FIG. It is x 'sectional drawing. The tube body 3 is formed in a hexagonal shape in which the planar outer shape of the neck 4 is a horizontally long shape. A ridge line portion 5 is formed on the upper side of the tube main body 3. Thereby, the flat cross section of the lower side of the tube main body 3 is formed in a cylindrical shape, and the flat cross section of the upper side is formed in a horizontally long hexagonal shape.

  Finally, the contents are filled from the lower end of the tube main body 3, and the tube container 1 is completed by heat-sealing the lower end of the tube main body 3 as shown in FIG. Heat sealing is performed by a known method. As described above, since the lower side of the tube main body 3 is formed in a cylindrical shape, the tube container 1 has an appearance that spreads in a skirt from the lower end of the ridge line portion 5 to the left and right end portions of the lower end of the tube main body 3.

  As described above, the polygonal column-shaped tube container 1 can be formed by the same work process as the neck forming work by general injection only by forming the groove part 22 in the side ridge part 21 of the core mold 20, which is very simple. In this way, each work process can be simplified and the manufacturing cost can be reduced.

  Further, as in the background art, in the present embodiment, the tube body 3 is formed in the forming process of the tube body, compared to the method of forming the ridge line portion in the tube body and forming the tube body in a polygonal shape. Since it is formed into a cylindrical shape at the stage, the subsequent printing process on the surface of the tube body 3 can be easily performed by a known method.

  Further, as in the background art, the neck portion 4 and the ridge line portion 21 are simultaneously injection-molded in the cylindrical tube body 3 as compared with a molding method in which the neck portion is molded by attaching the polygonal neck portion to the polygonal tube body. Therefore, the tube body 3 and the neck 4 can be easily aligned.

  In addition, for the tube container 1 itself, the neck 4 and the ridge line 5 are integrally formed inside the tube body 3 by simultaneously injection molding the neck 4 and the ridge line 21. For this reason, unlike a background art, a ridgeline part does not come out on the outer surface of a tube main body, but the external appearance of a surface becomes favorable. Moreover, durability of the boundary part of the neck part 4 and the ridgeline part 21 can be improved compared with the tube container which welds a neck part and a ridgeline part at the time of neck part attachment to a tube main body.

  In the present embodiment, the tube main body 3 is formed of a synthetic resin material, but is not limited thereto, and may be formed of a material obtained by laminating a synthetic resin material and a metal material, for example, an aluminum laminate material.

  In the present embodiment, the tube body 3 has a ridge line portion 21 formed on the upper side. For this reason, the lower side of the tube main body 3 is formed in the same cylindrical shape as the normal tube main body 3, and the ridgeline part 21 does not become obstructive, and can perform a heat sealing operation by a known method.

  In the present embodiment, the inner side of the third cavity mold 33 is recessed substantially in the same shape as the outer shape of the core mold 20. However, the inner shape of the third cavity mold 33 is not limited to this. For example, the third cavity mold 33 may be formed in an elliptical shape or a circular shape without corners. In this case, the planar outer shape of the shoulder 7 is an ellipse or a circle.

It is a sectional side view which shows suitable one Embodiment of the metal mold | die for tube container shaping | molding concerning this invention. It is a perspective view of the core type | mold used for suitable one Embodiment of the metal mold | die for tube container shaping | molding concerning this invention. It is a figure which shows an example of the tube main body applied to the metal mold | die of FIG. It is side sectional drawing of the molten resin injection | pouring stage which shows suitable one Embodiment of the shaping | molding method of the tube container concerning this invention. It is a sectional side view of the mold release stage which shows suitable one Embodiment of the shaping | molding method of the tube container concerning this invention. It is a perspective view which shows the tube main body shape | molded by the shaping | molding method of the tube container shown in FIG. 4 and FIG. It is a figure for demonstrating the structure of the tube main body shown in FIG. It is a perspective view showing one suitable embodiment of a tube container concerning the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Tube container 3 Tube main body 3a Upper end part 4 Neck part 5 Ridge line part 10 Mold 20 Core type | mold 21 Side ridge part 22 Groove part 30 Cavity type | mold

Claims (3)

A mold for forming a tube container in which a neck portion of a synthetic resin is injection-molded at the upper end of a tube body,
The mold includes a cavity mold that molds the outer peripheral surface of the neck, a polygonal columnar core mold having a plurality of side ridges to form an inner peripheral surface of the neck in a polygonal shape, and the tube from the neck In order to extend a ridge line part in the body, a mold for forming a tube container is provided, which includes a groove part appropriately cut from the upper end of the side ridge part. This is a tube container molding method in which a molten resin is injected into a neck molding space defined by a mold composed of a cavity mold and a core mold, thereby forming a neck at the upper end of the tube body attached to the core mold. And
The core mold is formed in a polygonal column shape having a plurality of side ridges, and a groove is formed on the side ridges to have an appropriate length from the upper end thereof, whereby the core mold and the cavity mold are formed. A ridge line molding space is formed in communication with the neck molding space, and the molten resin is injected into the neck molding space while the tube body is attached to the core mold, and the neck is molded at the upper end of the tube body. And forming a ridge line portion on the inner side surface of the tube main body with the molten resin flowing from the neck forming space into the ridge line forming space. By injecting molten resin into a neck molding space defined by a mold composed of a cavity mold and a core mold, a tube container having a neck molded at the upper end of a tube body mounted on the core mold,
Using the mold for forming a tube container according to claim 1, using the method for forming a tube container according to claim 2,
The core mold is formed in a polygonal column shape having a plurality of side ridges, and a groove is formed on the side ridges to have an appropriate length from the upper end thereof, whereby the core mold and the cavity mold are formed. A ridge line molding space is formed in communication with the neck molding space, and the molten resin is injected into the neck molding space while the tube body is attached to the core mold, and the neck is molded at the upper end of the tube body. And a ridge line portion formed on the inner side surface of the tube main body by the molten resin flowing into the ridge line portion forming space from the neck forming space.

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