JP4266492B2 - Aluminum laminated tube container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an aluminum laminate tube container having chemical resistance, gas barrier properties, and light shielding properties, and in particular, a neck portion provided with an extraction port at one end of a cylindrical body formed of an aluminum laminate material is injection molded. The present invention relates to an aluminum laminated tube container integrated.
[0002]
[Prior art]
Aluminum laminate tube containers are often used for accommodating gel-like substances because they have shape retention and are excellent in deformability and easy to squeeze out. In this case, by using a material excellent in chemical resistance, gas barrier property and light shielding property for the aluminum laminate tube container, it is possible to prevent deterioration of cosmetics and ointments stored therein.
[0003]
The aluminum-laminated tube container has a neck portion formed with an extraction port attached to one end of a cylindrical body formed of an aluminum-laminated material, and the other end is closed by being crushed and heat-sealed, In general, the neck extraction port is closed with a detachable cap.
[0004]
FIG. 9 is an enlarged view of the main part of the neck 2 of the conventional aluminum laminate tube container 1. The neck 2 is located between the content extraction port 2 a and the peripheral edge of the extraction port 2 a and the end of the cylindrical body 3. The neck 2 is integrated with one end of the cylindrical body 3 by injection molding. At this time, a corner portion from the flange portion 2 b to the cylindrical body 3 becomes the shoulder portion 4.
[0005]
That is, when the neck portion 2 is injection-molded, first, after the cylindrical body 3 is inserted and held on the outer periphery of the inner mold (not shown) whose upper end portion is the inner shape of the neck portion 2, the cylinder protruding from the inner mold The upper end of the body 3 is pressed by the outer periphery of the outer shape of the neck 2 to bend in an arc shape (curved portion R), and in this state, it is formed between the inner die and the outer die. A molten synthetic resin is injected into the space (cavity). At this time, the melted synthetic resin wraps around the inside of the curved portion R, the neck portion 2 and the cylindrical body 3 are integrated in the shoulder portion 4, and the injected synthetic resin is cured and the inner mold The tube container 1 is released from the outer mold.
[0006]
[Problems to be solved by the invention]
In such a conventional aluminum laminate tube container 1, the outer peripheral edge portion of the flange portion 2 b that becomes the shoulder portion 4 is gradually thinned along the inner side of the upper end curved portion R of the cylindrical body 3. In a tapered state, the synthetic resin is in a state where it wraps around the curved portion R along the inner peripheral surface of the cylindrical body 3. That is, the taper-around wrap portion 5 of the outer peripheral edge portion of the flange portion 2 b is formed by the synthetic resin dripping into the space portion between the inner mold and the cylindrical body 3. That is, conventionally, the molten synthetic resin is in a fluid state in the wraparound portion 5, and the injection pressure does not sufficiently act in the wraparound portion 5, and thus the pressure is uneven.
[0007]
For this reason, in the vicinity of the wraparound portion 5, the pressure to press the aluminum laminate material against the outer mold is insufficient or the pressure cannot be made uniform, and the aluminum laminate material softened by the heat of fusion wrinkles. Thus, the wrinkles remain on the shoulder 4 of the aluminum laminate tube container 1 even after the injection-molded synthetic resin is cured, and the commercial value thereof is lowered.
[0008]
Therefore, the present invention has been made in view of such conventional problems, and the injection pressure of the portion where the synthetic resin injected to form the neck is integrated with the cylindrical body formed of the aluminum laminate material, It is an object of the present invention to provide an aluminum laminate tube container that can be sufficiently and evenly applied over the entire integrated portion and can prevent wrinkles on the shoulder portion.
[0009]
[Means for Solving the Problems]
In order to achieve such an object, the present invention provides an inner mold that is formed of an aluminum laminate material and is closely inserted into the cylindrical body, leaving one end thereof, and an end face of the inner mold as a starting point. A cavity is formed with an outer mold that is arranged in opposition to the inner mold while curving inwardly with the one end of the body as a shoulder, and a neck portion having an extraction port is formed by injecting synthetic resin into the cavity. In the aluminum laminate tube container that is integrally formed with the part, the outer peripheral edge of the inner mold end surface that forms the starting point of the shoulder is formed as a flat surface that abuts against the inner peripheral surface of the cylindrical body , The distance between the extraction port and the shoulder is changed in the circumferential direction of the cylindrical body, and the cavity is narrow at a short portion according to the distance between the extraction port and the shoulder. It is characterized in that it is wider at the long portion .
[0010]
According to this configuration, the neck portion is formed on one end side of the cylindrical body by injecting the synthetic resin into the cavity, and this neck portion is integrated with the shoulder portion at one end of the cylindrical body. At this time, the outer peripheral edge of the inner mold end surface that forms the starting point of the shoulder is formed on a flat surface that abuts against the inner peripheral surface of the cylindrical body, and the synthetic resin injected into the cavity fills this In addition, it is dammed to the flat surface formed on the outer peripheral edge of the inner mold end surface, and flows toward the shoulder portion toward the inner peripheral surface of the cylindrical body against which the flat surface abuts. Therefore, the injection pressure at the time of injection molding can be applied evenly to the shoulder curved inward, and wrinkles are formed in the shoulder so as to push the shoulder together with the heat of fusion. Is prevented.
[0012]
According to this configuration, when the synthetic resin is injected into the cavity and the neck portion is molded, the pressure of the synthetic resin can be adjusted according to the distance from the extraction port to the shoulder portion. The injection pressure when the synthetic resin reaches the shoulder, even if the distance from the extraction port to the shoulder is different in the circumferential direction of the cylindrical body, preventing the pressure from becoming lower than the short part. Can be equalized over the entire circumference, thereby preventing wrinkles from forming on the shoulder.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1 to 5 show an embodiment of the aluminum laminated tube container of the present invention, FIG. 1 is a sectional view of a semi-finished product in which the neck and the cylindrical body of the aluminum laminated tube container are integrated, and FIG. Fig. 3 is an enlarged cross-sectional view of part A in Fig. 1, Fig. 4 is a cross-sectional view showing a preparation state of an injection mold when molding the neck, and Fig. 5 is molding the neck. It is sectional drawing which shows the resin injection state to the injection mold at the time.
[0014]
The aluminum laminated tube container 10 of the present embodiment basically includes an inner mold 22 and an inner die 22 that are formed by forming a cylindrical body 12 from an aluminum laminated material 11 and are closely inserted into the cylindrical body 12 leaving one end thereof. A cavity 26 is formed by an outer mold 23 facing the inner mold 22 while curving inward with the one end of the cylindrical body 12 as a shoulder R from the end surface of the mold 22, and synthetic resin is formed in the cavity 26. In the aluminum laminated tube container in which the neck portion 13 having the extraction port 14 is integrally formed with the shoulder portion R by injection, the outer peripheral edge of the end surface of the inner mold 22 forming the starting point of the shoulder portion R is the cylindrical body 12. It is formed by a flat surface F that abuts against the inner peripheral surface.
[0015]
That is, FIG. 1 is a cross-sectional view of a semi-finished product showing the formation of an aluminum laminate tube container 10, and shows a state in which a neck portion 13 is attached to an upper end portion 12 a of a cylindrical body 12 in which an aluminum laminate material 11 is formed into a cylindrical shape. In the figure, the lower end 12b of the cylindrical body 12 is in an open state, but this open lower end 12b is crushed and heat-sealed after filling the contents. It is blocked by.
[0016]
The neck portion 13 is formed of a synthetic resin, and includes an extraction port 14 formed in a protruding state at the center portion, and a flange portion 15 formed at the lower peripheral edge of the extraction port 14, and the outer periphery of the flange portion 15 is The cylindrical body 12 is coupled to the inner periphery of the upper end portion 12a. An opening 14a is formed at the tip of the protruding portion of the extraction port 14, and a screw portion 14b is formed on the outer periphery of the protruding portion. A cap (not shown) is detachably screwed onto the screw portion 14b.
[0017]
As shown in FIG. 2, the aluminum laminate material 11 forming the cylindrical body 12 includes a polyethylene (PE) layer 11a from the inside toward the outside, an adhesive layer 11b using an ethylene-methacrylic acid copolymer, It is composed of a multilayer of an aluminum (AL) layer 11c, a polyethylene terephthalate (PET) layer 11d, and a polyethylene (PE) layer 11e, and has excellent chemical resistance, gas barrier properties, and light shielding properties.
[0018]
The cylindrical body 12 is preferably formed into a seamless cylindrical shape by extruding with these multiple layers, but in addition to this, both sides of the aluminum laminate material 11 cut into a rectangular shape are formed. It can also be formed in a cylindrical shape by heat fusion.
[0019]
The cylindrical body 12 is set in an injection mold 20 shown in FIGS. 4 and 5, and the neck portion 13 is injection-molded on the cylindrical body 12. That is, the injection mold 20 includes an inner mold 22 erected on a support base 21, an outer mold 23 that moves up and down at the upper end of the inner mold 22, and a molten resin that moves up and down above the outer mold 23. The runner member 24 is provided, and the upper end portion of the inner mold 22 is formed along the inner shape of the neck portion 13. A portion of the outer mold 23 facing the inner mold 22 is formed along the outer shape of the neck 13. The outer die 23 is provided with a separate screw die 25 for forming the screw portion 14b, and the screw die 25 is divided into left and right parts and divided parts 25a and 25b that are close to and away from each other. .
[0020]
Therefore, in order to integrally form the neck 13 on the cylindrical body 12 using the injection mold 20, the cylindrical body 12 is first inserted and held in the inner mold 22 as shown in FIG. At this time, the upper end portion 12 a of the cylindrical body 12 is slightly protruded upward from the outer peripheral edge of the inner mold 22. Next, as shown in FIG. 5, the outer mold 23 is lowered, and the upper end 12a of the cylindrical body 12 is pressed by the inner peripheral edge 23a (see FIG. 4) corresponding to the outer peripheral edge. Is curved in an arc toward the inside to form a shoulder R. Further, in this state, the split dies 25a and 25b of the screw die 25 are in a state of being abutted with each other.
[0021]
Then, the lower end portion of the runner member 24 is inserted into the central recess 25c of the screw mold 25 and melted into the cavity 26 between the inner mold 22, the outer mold 23 and the screw mold 25 from the injection passage 24a. Resin is injected at a predetermined pressure. Then, the cavity 26 is filled with the molten resin, the extraction port 14 is formed inside the screw mold 25, and the flange portion 15 is formed below the outer mold 23. As shown in FIG. 3, the outer peripheral edge portion 15 a of the flange portion 15 wraps around the inside of the shoulder portion R of the cylindrical body 12, and the flange portion 15 and the cylindrical body 12 are integrated at the shoulder portion R. The
[0022]
Then, when the resin injected into the cavity 26 is cooled and hardened, the outer mold 23 is raised while separating the split molds 25 a and 25 b of the screw mold 25, and the cylindrical body 12 is taken out from the inner mold 22. Thus, the semi-finished product shown in FIG. 1 in which the neck portion 13 is attached to the cylindrical body 12 is manufactured.
[0023]
Here, the outer peripheral edge portion 15a of the flange portion 15 contacts and is integrated with the inner side of the shoulder portion R, but as shown in FIG. 4, the outer peripheral edge portion of the inner mold 22 for forming the outer peripheral edge portion 15a. Is formed on the flat surface F that abuts against the inner periphery of the cylindrical body 12, and the molten resin injected into the cavity 26 is in contact with the flat surface F of the inner mold 22 and the inner periphery of the cylindrical body 12. It is designed to dam up the surface. As shown in FIG. 3, the inner surface 15 b of the outer peripheral edge portion 15 a of the collar portion 15 (neck portion 13) is flat and joined to the inner periphery of the cylindrical body 12.
[0024]
In the aluminum laminate tube container 10 of this embodiment having the above configuration, the neck 13 is made of an aluminum laminate material by injecting molten resin into the cavity 26 between the inner mold 22 and the outer mold 23. The molten resin injected into the cavity 26 is first extracted from the central portion of the neck 13 so as to be integrated with the upper end portion 12a of the cylindrical body 12 formed in FIG. It flows from the opening 14 toward the flange 15 and finally reaches the outer peripheral edge 15a of the flange 15.
[0025]
The heat of the injected resin acts on the upper end portion of the cylindrical body 12 with which the outer peripheral edge portion 15a contacts, that is, the shoulder portion R, so that the aluminum laminate material 11 in the portion becomes soft, and this soft The injected resin is integrated. At this time, an injection pressure acts on the inner side of the shoulder portion R with which the outer peripheral edge portion 15a of the collar portion 15 is contacted, and the shoulder portion R is pressed against the inner surface of the outer mold 23 by this injection pressure.
[0026]
Here, in the present embodiment, the outer peripheral edge of the end surface of the inner mold 22 is formed on the flat surface F that abuts against the inner peripheral surface of the cylindrical body 12, and the molten resin injected into the cavity 26 is the flat surface F. And the inner peripheral surface of the cylindrical body 12 in close contact therewith can be dammed up. Accordingly, a predetermined thickness is secured at the outer peripheral edge portion 15a of the flange portion 15 at the joint portion of the cylindrical body 12, and the injected molten resin is smoothly placed at the end of the outer peripheral edge portion 15a contacting the shoulder R. Can be reached. For this reason, since the injection pressure of the molten resin can be made to act equally over the entire section L in the bending direction of the shoulder R, the entire shoulder R of the aluminum laminate material 11 softened by the heat of fusion is uniformly injected. It becomes possible to press against the inner surface of the outer mold 23 with pressure, and the formation of wrinkles on the shoulder R is prevented. Therefore, the shoulder R of the aluminum laminated tube container 10 is formed as a smooth curved surface without wrinkles over the entire circumference, and the appearance value can be improved to increase the commercial value.
[0027]
FIG. 6 is an enlarged cross-sectional view of a main part showing another embodiment, in which the same components as those in the above embodiment are denoted by the same reference numerals and redundant description is omitted. That is, in the aluminum laminated tube container 10a of this embodiment, the outer peripheral edge portion 15a of the injection-molded collar portion 15 is suspended downward, and the thickness of the outer peripheral edge portion 15a to be suspended is reduced. It is made equal over the entire bending direction section L of the shoulder R, and the lower surface 15c at the tip thereof is made flat and joined to the inner peripheral surface of the cylindrical body 12 at a right angle. Of course, although not shown, the outer peripheral edge shape of the end face of the inner mold is formed along the outer peripheral edge portion 15a of the flange portion 15, and the outer peripheral edge corresponding to the lower surface 15c is perpendicular to the inner peripheral surface of the cylindrical body 12. In close contact with the molten resin, the injected molten resin is blocked.
[0028]
Therefore, even in this embodiment, the outer peripheral edge portion 15a of the flange portion 15 has a predetermined thickness at the joint portion of the cylindrical body 12, and the injected molten resin is in contact with the shoulder portion R. The end of the peripheral edge portion 15a can be smoothly reached, and the injection pressure can be applied equally over the entire section L in the bending direction to prevent the shoulder portion R from being wrinkled.
[0029]
7 and 8 show other embodiments of the present invention, and the same components as those of the above-described embodiments are denoted by the same reference numerals and redundant description is omitted. 7 is a plan view of the aluminum-laminated tube container, and FIG. 8 is a cross-sectional view taken along the line BB in FIG.
[0030]
In the aluminum laminated tube container 10b of this embodiment, as shown in FIG. 7, the planar shape of the flange portion 15 is elliptical, and the distance from the extraction port 14 to the shoulder portion R of the upper end portion of the cylindrical body 12 is a circumference. The present invention is applied when the direction is changed.
[0031]
That is, the ellipse flange 15 has a long axis X direction distance a from the extraction port 14 to the outer peripheral edge portion 15a of the flange portion 15 longer than a short axis Y direction distance b. The molten resin injected from the 14 portion travels a longer distance in the major axis X direction than the minor axis Y direction and reaches the shoulder R. For this reason, the flow resistance of the molten resin until reaching the shoulder R is increased in the major axis X direction, which means that the injection pressure acting on the shoulder R is increased in the minor axis Y direction where the flow resistance is small, As a result, the injection pressure acting on the shoulder R changes in the circumferential direction.
[0032]
Therefore, in this embodiment, the cavity 26 between the extraction port 14 of the neck 13 and the shoulder R is made narrower as the distance from the extraction port 14 to the shoulder R becomes shorter, and from the extraction port 14 to the shoulder. The thickness t between the portions R is formed thinner as the distance between them becomes shorter. That is, in this embodiment, the thickness t in the major axis X direction is uniformly formed in the length direction to be the thickest, while the thickness t in the minor axis Y direction is reduced by a predetermined amount at the middle portion to be the smallest. The injection pressure of the molten resin is adjusted by the throttle portion 15d so that the injection pressure at the shoulder R can finally be made equal in the major axis X direction and the minor axis Y direction. Of course, in the portion sandwiched between the major axis X and the minor axis Y, the aperture amount gradually increases from the major axis X to the minor axis Y. Thereby, the passage resistance while the molten resin reaches the shoulder R can be made substantially equal over the entire circumference of the shoulder R. Accordingly, even when the flange portion 15 is elliptical as in the present embodiment, the injection pressure when the molten resin reaches the shoulder portion R can be equalized over the entire circumference. For this reason, since wrinkles can be prevented from approaching in the circumferential direction of the shoulder portion R, the product value of the aluminum laminated tube container 10b is further increased in combination with the ability to improve the design effect by making the collar portion 15 non-circular. Can be increased.
[0033]
Of course, even in this embodiment, the outer peripheral edge portion 15a of the collar portion 15 has a sufficient thickness to cause the injection pressure to act equally over the entire section L in the bending direction of the shoulder portion R. Moreover, although the case where the shape of the said collar part 15 was made into the ellipse was shown in this embodiment, this invention is applicable even if it has other non-circular shapes, without being restricted to this.
[0034]
【The invention's effect】
As described above, in the aluminum laminated tube container of the present invention, the outer peripheral edge of the inner mold end surface that forms the starting point of the shoulder is formed on a flat surface that abuts against the inner peripheral surface of the cylindrical body. When the synthetic resin injected into the cavity fills up, it is dammed to the flat surface formed on the outer peripheral edge of the inner mold end surface, and toward the inner peripheral surface of the cylindrical body against which the flat surface abuts. It is possible to flow to the shoulder part, to make the injection pressure at the time of injection molding work uniformly on the shoulder part curved inward, and to stretch the shoulder part together with the heat of fusion. , Wrinkles can be prevented from forming on the shoulder.
[0035]
In addition, when the synthetic resin is injected into the cavity and the neck is molded, the pressure of the synthetic resin can be adjusted according to the distance from the extraction port to the shoulder. Even if the distance from the extraction port to the shoulder is different in the circumferential direction of the cylindrical body, the injection pressure when the synthetic resin reaches the shoulder is reduced over the entire circumference. It is possible to equalize, thereby preventing wrinkles from forming on the shoulder.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a semi-finished product in which a neck and a tubular body of an aluminum laminate tube container showing an embodiment of the present invention are integrated.
FIG. 2 is an enlarged cross-sectional view of an aluminum laminate material showing an embodiment of the present invention.
FIG. 3 is an enlarged cross-sectional view of a portion A in FIG. 1 showing an embodiment of the present invention.
FIG. 4 is a cross-sectional view of a preparation state of an injection mold when a neck portion is molded according to an embodiment of the present invention.
FIG. 5 is a cross-sectional view of a state where a resin is injected into an injection mold when a neck portion is molded according to an embodiment of the present invention.
FIG. 6 is an enlarged cross-sectional view of a main part showing another embodiment of the present invention.
FIG. 7 is a plan view of an aluminum laminated tube container showing another embodiment of the present invention.
8 is a cross-sectional view taken along the line BB in FIG. 7 showing another embodiment of the present invention.
FIG. 9 is an enlarged cross-sectional view of a main part of a conventional aluminum-laminated tube container.
[Explanation of symbols]
10, 10a, 10b Aluminum / Laminate Tube Container 11 Aluminum / Laminate Material 12 Tubular Body 13 Neck 14 Extraction Port 15 Gutter 20 Injection Mold 22 Inner Mold 23 Outer Mold 26 Cavity F Flat Surface R at the Outer Periphery of the Inner Mold Shoulder L All curve direction

Claims (1)

A cylindrical body is formed of an aluminum laminate material. The inner mold is closely inserted into the cylindrical body while leaving one end thereof, and the end of the cylindrical body starts from the end face of the inner mold as the shoulder. An aluminum laminate in which a cavity is formed with an outer mold that is arranged to face the inner mold while being curved, and a neck portion having an extraction port is integrally formed with the shoulder portion by injecting a synthetic resin into the cavity In tube containers,
The outer peripheral edge of the inner mold end surface forming the starting point of the shoulder is formed as a flat surface that abuts against the inner peripheral surface of the cylindrical body ,
The distance between the extraction port and the shoulder is changed in the circumferential direction of the cylindrical body, and the cavity is at a short place according to the distance between the extraction port and the shoulder. An aluminum laminate tube container that is widely formed in narrow and long locations .

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