JP4025691B2 - Production apparatus and production method for foam molded container - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
TECHNICAL FIELD The present invention relates to a foam molding container, and more particularly to a foam molding container manufacturing apparatus and manufacturing method suitable as a cold storage container for storing and using ice together with an object to be stored.
[0002]
[Prior art]
Conventionally, it is known that foamed containers are manufactured by foam-molding pre-expanded particles in a cavity space formed by a core mold and a cavity mold, and the manufactured containers are lightweight and have a required strength. It is used in many fields because it is equipped. Among them, the frequency of use as a so-called cold storage container in which objects to be stored such as fresh fish, fruits and vegetables, fresh foods, medicines and the like are stored together with ice for transportation and storage is increasing.
[0003]
In the case of a cold container, a drainage hole for ice-melted water is often provided in order to accommodate ice together with the object to be accommodated. The drainage hole functions effectively for drainage, but in many cold storage containers, the inside and outside of the container communicate directly with each other through the drainage hole, and external air may enter the container through the drainage hole. . When outside air enters, the temperature in the container rises, the cooling effect is lowered, and the cooling time is shortened. Japanese Patent Application Laid-Open No. 2003-40341 discloses an improved cold storage container that eliminates such drawbacks.
[0004]
FIG. 6 shows the cold storage container 10 described in the above publication. A water reservoir 12 is formed on the container bottom 11 side, and water staying there (ice melting water) prevents communication between the drain hole 13 and the container interior S. At the same time, the water level H of the water reservoir 12 is designed to be lower than the uppermost end of the container bottom 11, thereby eliminating the possibility that the object to be stored is immersed in water. Specifically, a vertical through hole is formed as a drain hole 13 in the side wall 14 of the container 10, and a water guide hole 15 communicating with the drain hole 13 and the water reservoir 12 is further formed so as to face obliquely downward. Yes. The water introduction hole 15 is designed such that the uppermost end 16 a of the introduction port 16 on the water reservoir 12 side is lower than the lowermost end 17 a of the discharge port 17 on the drainage hole 13 side. The position of 17a is designed to be lower than the level of the bottom 11 of the container 10. As a result, water always stays in the water reservoir 12 at the water level H at the lowermost end 17a of the outlet port 17, and the drain hole 13 and the interior S of the container 10 are sealed (sealed with water). At the same time, water above the water level H does not remain in the interior S of the container, and it is eliminated that the object to be contained is immersed in water.
[0005]
The above publication further discloses a manufacturing method and apparatus for manufacturing the cold insulation container shown in FIG. FIG. 7 illustrates this, in which 1 is a core mold, 2 is a cavity mold, and 3 is a cavity space between both molds. Reference numeral 4 denotes a pipe for forming a drain hole 13 penetrating the side wall 14 of the container 10 and is loaded so as to be positioned between the core mold 1 and the cavity mold 2. The pipe 4 is provided with a movable pin 6 that is partly protruded from the upper end of the pipe 4 by the pressing force of the spring 5 at all times, and is bent to form a water introduction hole 15 at the lower end of the movable pin 6. A flexible molding core 7 is connected. Further, a guide hole 8 for guiding the molding core 7 obliquely downward is formed in the pipe 4. The core mold 1 has a protrusion 1a for forming the water reservoir 12, and the guide hole 8 for the molding core 7 faces the protrusion 1a. The lower end side of the pipe 4 is fixed to the cavity mold 2 by a setting nut 9.
[0006]
FIG. 7 shows a state in which the mold is closed, and the movable pin 6 is pushed down against the spring 5 by the core mold 1, and the molding core 7 is pushed out obliquely downward along the guide hole 8 accordingly. Then, the tip abuts against the protrusion 1 a for forming the water reservoir 12. In this state, the pre-expanded particles are expanded, and after foam molding, when the core mold 1 is moved and the mold is opened, the movable pin 6 returns to the original protruding position by the pressing force of the spring 5, and the molding core 7 is also formed. The pipe 4 is accommodated in the pipe 4 while coming out of the water guide hole 15. By taking out the molded product from the cavity mold 2, the drainage hole 13 penetrating in the vertical direction is formed in the side wall 14, and the water introduction hole 15 communicating with the drainage hole 13 and the water reservoir 12 is inclined downward. Thus, the formed foamed container 10 is obtained.
[Patent Document 1]
Japanese Patent Laid-Open No. 2003-40341
[Problems to be solved by the invention]
By using the manufacturing apparatus shown in FIG. 7, the side wall shown in FIG. 6 has a first hole (drain hole 13) penetrating in the vertical direction, and further, the first hole and the accommodation space S are provided. The foam-molded container (cold container 10) having the second hole to be connected (water guide hole 15) can be easily foam-molded. However, the hole forming means loaded between the core mold 1 and the cavity mold 2 to form the first hole and the second hole has a large number of movable parts and a large number of parts. It is complicated.
[0008]
Further, in the case of manufacturing a container having a low height, because of its structure, the bending angle with respect to the perpendicular direction of the molding core 7 when coming out from the guide hole 8 has to be increased, and it is formed regardless of the extrusion. Since the resistance when pulled out from the second hole is increased, it is necessary to use the spring 5 having a large repulsive force. Further, when the bending angle is increased, the frictional resistance between the guide hole 8 and the molding core 7 is also increased, and the life of the molding core 7 is inevitably shortened.
[0009]
For this reason, the manufacturing apparatus shown in FIG. 7 is not sufficient for manufacturing a container having a low height. Further, since the hole forming means is loaded between the core mold 1 and the cavity mold 2 with only the lower end fixed to the cavity mold, the fixing portion must be rigid in order to enhance the stability.
[0010]
The present invention has been made in view of the above circumstances, and the side wall portion has a first hole penetrating in the vertical direction, and further, a second hole that connects the first hole and the accommodation space. In the manufacturing apparatus for foam-molded containers having a structure, the hole forming apparatus provided therein is more simplified and the life of the molding core can be extended, and as a result, it is suitably molded in a low-height container. It is an object of the present invention to provide a method and a method for producing a further improved foam-molded container that can be made.
[0011]
[Means for Solving the Problems]
An apparatus for manufacturing a foam-molded container according to the present invention has an accommodating space defined by a side wall and a bottom, and a first hole penetrating in the vertical direction is formed in the side wall, and further, the first hole and the accommodating A manufacturing apparatus including a core mold and a cavity mold for manufacturing a foam-molded container in which a second hole connecting spaces is formed, and the member for forming the first hole is one mold It consists of a first member attached to (for example, a core mold) and a second member attached to the other mold (for example, a cavity mold), and the first member is a flexible molding for forming the second hole. The second member has a guide portion on the upper end side for guiding the molding core toward the housing space side of the molding container, and the first member and the second member are end-to-end when the mold is closed. To secure a space for the first hole and provided in the first member The molding core is positioned in a posture along the guide portion of the second member and in a posture in which the tip is in contact with one mold to secure a space for the second hole. At the time of mold opening after molding, the first member can be pulled out from the second hole in which the molding core is formed while moving in the direction away from the second member together with one mold. And
[0012]
In this apparatus, when the mold is closed, the first member simply moves together with one of the molds, and in the positioning process, the molding core has a specific shape as in the hole forming apparatus shown in FIG. It does not take a behavior of protruding while passing through the guide hole. The second member also remains in place with the other mold. That is, neither the first member nor the second member has a movable member inside, and the mechanism for forming the first and second holes is extremely simplified, and maintenance is facilitated. In addition, since the molding core can be attached with the tip protruded obliquely downward at the required angle from the beginning, the second hole can be molded without difficulty even in a container having a low side wall. can do. Furthermore, since a large frictional resistance is not applied to the molding core, the service life of the molding core is extended. When the mold is opened, the molding core rises together with the first member and is extracted from the second hole, and the whole hole is accommodated in the first hole. However, the first hole has a large space. The extraction of the molding core proceeds without difficulty.
[0013]
In the apparatus of the present invention, the shape of the molding core is not particularly limited, but is preferably a flat member. As a result, even if the cross-sectional area is the same, the second hole having a lower height can be formed as compared with the case where the cross-section is circular, and particularly when forming a container having a low side wall height, The bottom thickness can be used effectively.
[0014]
In the apparatus of the present invention, preferably, the first member is attached so as to be slidable on one mold via an elastic material. Then, after the molding core provided on the first member is positioned in a posture along the guide portion of the second member and in a posture in which the tip is in contact with the die, one die resists the elasticity of the elastic material. To move further downward. With this configuration, the pre-expanded particles can be filled into the cavity space with a slight gap between the core mold and the cavity mold, and the so-called cracking operation is performed, in which the final mold is closed after filling. Can be done.
[0015]
The manufacturing apparatus according to the present invention can be used to manufacture a foam molded container for any application, but the first hole is a drain hole, has a water reservoir at the bottom of the container, and the second hole is in the accommodation space. It is particularly suitable as a device for forming a cold container that is a water guide hole for discharging water (water in the water reservoir) to the first hole. At that time, the core mold, which is one of the molds, is provided with a bulging portion for forming a water reservoir at the bottom of the container, and the molding core is inclined obliquely downward when the mold is closed and the tip is Positioning is performed in a state where it is in contact with the bulging portion of the core mold.
The present invention also discloses a method for manufacturing a foam molded container using the above manufacturing apparatus.
[0016]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. In addition, the following description is given by taking as an example the case of manufacturing a cold insulating container having the shape shown in FIG. Accordingly, the core mold and the cavity mold are substantially the same as those shown in FIG. 7, and members having the same functions will be described using the same reference numerals as those used in FIGS. . However, the container and the mold to be manufactured are not limited to this. In the accompanying drawings, FIG. 1 is a view showing a hole forming apparatus used in the present invention together with a cold container after being formed, and FIGS. 2, 3, and 4 sequentially show a forming procedure using a forming die. FIG. 5 is a cross-sectional view showing the main part of the molded cold-insulated container.
[0017]
In the present invention, the hole forming device A has a member 30 for forming the drain hole 13 as the first hole and a molding core 50 for forming the water guide hole 15 as the second hole, The member 30 includes a first member 31 attached to the core mold 1 and a second member 41 attached to the cavity mold 2. The first member 31 includes a main body portion 32 having an oval cross section, a base portion 33 on the upper portion, and a support column 34 protruding from the upper surface of the base portion 33. A concave groove 35 having a rectangular cross section is formed on one side surface of the main body portion 32 in the axial direction, and a lower end portion of the concave groove 35 is a protruding portion 36 having a smooth inclined surface 36a toward the opposite side surface. The base portion 33 also has an elliptical cross section, but has a larger cross sectional area than the main body portion 32, and a connecting portion with the main body portion 32 is an inclined surface 37. An inner screw 38 is cut in the support post 34. Note that the cross-sectional shape of the main body 32 and the base 33 is an oval shape, which is one example in consideration of formability, and the cross-sectional shape is arbitrary.
[0018]
The second member 41 has the same cross-sectional shape as the main body portion 32 of the first member 31, and its upper end surface 42 is a surface that can be brought into contact with the lower end surface of the main body portion 32, preferably with an adhesive body. Further, a notch 43 having a shape into which the protruding portion 36 of the main body portion 32 enters is formed from the upper end surface 42 to the side surface, and the bottom surface of the notch 43 is a guide portion 44 that is a smooth curved surface. An inner screw 45 is formed on the bottom surface.
[0019]
A molding core 50 having the same cross-sectional shape is detachably attached to the groove 35 formed in the main body portion 32 of the first member 31 with a screw 51. The molding core 50 is a plate-like member having a rectangular cross section, and is made of a flexible material, for example, a material such as Teflon (trade name). The length of the molding core 50 is such that the tip 52 protrudes by a predetermined length from the lower end of the main body portion 32 in a state where the molding core 50 is attached to the concave groove 35. The shape is corrected in advance so as to follow. In addition, it is not essential that the molding core 50 has a plate shape, and the molding core 50 may have a circular cross section, an elliptical shape, or the like. In that case, the cross-sectional shape of the groove 35 formed in the main body portion 34 of the first member 31 is changed to a shape that can be accommodated in a state in which the groove 50 is in close contact depending on the shape of the molding core 50.
[0020]
In molding, the first member 31 is attached to the core mold 1 and the second member 41 is attached to the cavity mold 2. As shown in FIG. 2, the core mold 1 has a protrusion 1 a for forming a water pool portion 12 of the cold container 10. The core mold 1 includes an upper flange 61 that closes the cavity space 3 formed by the core mold 1 and the cavity mold 2, and the upper flange 61 has a base 33 of the first member 31 from the lower surface toward the upper surface. A vertical hole 62 having an elliptical cross section is formed, and a through hole 63 through which the column 34 of the first member 31 is inserted is formed on the ceiling side of the vertical hole 62. And the vertical hole 62 is formed in the position which opposes the protrusion 1a for forming the said water reservoir part 12 so that the long diameter may become parallel to the side surface of the protrusion 1a.
[0021]
At the time of attachment, the support 34 is inserted into the through hole 63 with an appropriate elastic material such as a coil spring 64 interposed around the support 34, and the set screw 65 is screwed into the internal screw 38 from above. Thereby, the first member 31 is fixed to the upper flange 61, that is, the core mold 1 in a state where a part of the base portion 33 is inserted into the vertical hole 62 and can move upward. At that time, fixing is performed such that the opening surface of the groove 35 formed in the main body 32 is opposite to the protrusion 1 a for forming the water pool portion 12. Note that the length of the coil spring 64 is set so that it is in a fixed state and is compressed to some extent.
[0022]
The second member 41 is fixed to the cavity mold 2 by screwing a set screw 66 into the inner screw 45. The fixing position is a position facing the main body 32 of the first member 31 fixed to the core mold 1 when the mold is closed, and the side opening surface of the notch 43 is the opening surface of the groove 35 of the first member. And fix it on the opposite side.
[0023]
In this state, the core mold 1 is brought close to the cavity mold 2. Due to the approach, the lower part of the molding core 50 fixed to the first member 31 is guided along the curved guide portion 44 of the notch 43 formed in the second member 41, and the protrusion 1a. At a position opposite to the side surface of the lens, the posture gradually inclines obliquely downward. FIG. 2 shows a state immediately before the mold closing is completed (a state in which cracking is performed). In this state, the tip 52 of the molding core 50 is in contact with the side surface of the protrusion 1a without a gap. Even if the pre-expanded particles are filled, the expanded particles are not sandwiched and the inlet of the water guide hole 15 is not closed. In an actual molding die, the shape of the position of the protrusion 1a, the curved shape of the guide portion 44, the length of the molding core 50, and the like are set in advance so that such a posture can be taken. In particular, when it is intended to obtain the cold insulation container 10 having the water sealing function as shown in FIG. 6, the positional relationship between the inlet 16 and the outlet 17 of the water guide hole 15 is set appropriately. In addition, it is necessary to set the curved surface shape of the guide portion 44 and the like. In this state, the bottom surface of the first member 31 and the upper end surface 42 of the second member 41 are in contact with each other.
[0024]
In this state, filling of the pre-expanded particles into the cavity space 3 and cracking are performed according to a conventional method, and then the core mold 1 is moved again to perform final mold closing. FIG. 3 shows this state, and the cavity space 3 is completely sealed by the further downward movement of the core mold 1, but the movement is a spring interposed around the column 34 of the first member 31. 64, the posture of the first member 31 and the second member 41 is not affected, and the contact state between the tip 52 of the molding core 50 and the protrusion 1a formed on the core mold 1 is almost as it is. Maintained. In this state, the pre-expanded particles are molded according to a conventional method. The drain holes 13 (first holes) are formed at the positions of the first member 31 and the second member 41, and the water guide holes 15 (second holes) are protruded to the side of the molding core 50. Hole) will be formed.
[0025]
After completion of the molding process, the core mold 1 is moved to open the mold. The state is shown in FIG. The 1st member 31 raises with the movement of the core type | mold 1, and the shaping | molding core 50 also raises simultaneously. The portion protruding to the side of the molding core 50 as it rises is gradually extracted from the water guide hole 15, and as shown in FIG. 4, the drain hole 13 formed by raising the first member 31. Is housed in the space. Even if the bending degree of the molding core 50 is increased at the time of molding, it is extracted into a wide space as the drainage hole 13, and thus the extraction is completed without difficulty. Therefore, even if it is a container with the low side wall part 14, the water conveyance hole 15 can be formed as expected.
[0026]
When the core mold 1 is further raised, all of the first member 31 and the molding core 50 come out of the space of the drain hole 13, and then the drain hole 13 formed with the second member 41 together with the cavity mold 2. By extracting from, the cold-reserving container 10 which shows a principal part in a cross section in FIG. 5 is obtained.
[0027]
In the above description, the foam molded container is illustrated as having a shape having the water reservoir portion 12 on the bottom surface, but the manufacturing apparatus and the manufacturing method of the present invention are containers having a flat bottom surface that does not have such a water reservoir portion. Of course, the core die 1 is not formed with a portion corresponding to the protrusion 1a. Further, the molding core 50 can be made of any material as long as it has flexibility and required heat resistance strength, and hard synthetic rubber or the like can be used in addition to the resin material.
[0028]
【The invention's effect】
As described above, according to the present invention, the side wall portion has a first hole such as a drainage hole penetrating in the vertical direction, and further, like a water conveyance hole that connects the first hole and the accommodation space. In the apparatus for manufacturing a foam molded container having such second holes, the hole forming apparatus provided therein can be made more simplified, and the life of the molding core can be prolonged. As a result, even a container having a low side wall portion can be formed without difficulty.
[Brief description of the drawings]
FIG. 1 is a view showing a hole forming device used in an apparatus for manufacturing a foam molded container according to the present invention together with a cold container after molding.
FIG. 2 is a diagram for explaining a procedure for producing a container using the apparatus for producing a foam-molded container according to the present invention, and shows a state before filling pre-expanded particles.
FIG. 3 is a view subsequent to FIG. 2 and shows a state after the mold is closed.
4 is a view subsequent to FIG. 3, showing a state in which the mold is opened after molding. FIG.
FIG. 5 is a cross-sectional view showing a main part of a molded container.
FIG. 6 is a diagram illustrating an example of a conventional cold container.
7 is a view for explaining an apparatus for manufacturing the cold insulation container shown in FIG. 6;
[Explanation of symbols]
DESCRIPTION OF SYMBOLS A ... Hole formation apparatus, 1 ... Core type | mold, 1a ... Projection for forming a water reservoir part, 2 ... Cavity type | mold, 3 ... Cavity space, 10 ... Container, 11 ... Bottom surface, 12 ... Water reservoir part, 13 ... Drain hole (First hole), 15 ... water guide hole (second hole), 30 ... member for forming the first hole, 31 ... first member, 32 ... main body part, 33 ... base part, 34 ... strut, 35 ... concave groove having a rectangular cross section, 36 ... projecting portion, 38 ... inner screw, 41 ... second member, 42 ... upper end surface of the second member, 43 ... notch, 44 ... curved surface, 45 ... inner screw, 50 ... Molding core, 52 ... tip of molding core, 61 ... upper flange of core type, 62 ... vertical hole with oval cross section, 63 ... vertical hole, 64 ... spring

Claims (5)

There is a housing space defined by the side wall and the bottom, a first hole penetrating in the vertical direction is formed in the side wall, and a second hole is formed to connect the first hole and the housing space. A manufacturing apparatus having a core mold and a cavity mold for manufacturing a foam molded container,
The member for forming the first hole includes a first member attached so as to be slidable on one mold via an elastic material and a second member attached on the other mold, and the first member Includes a flexible molding core for forming the second hole, and the second member includes a guide portion on the upper end side for guiding the molding core toward the housing space side of the molding container. And
When the mold is closed, the end surfaces of the first member and the second member are in contact with each other to secure a space for the first hole, and the molding core provided in the first member follows the guide portion of the second member. Positioned in a posture and a posture in which the tip is in contact with one mold to secure a space for the second hole,
Further, after the molding core provided on the first member is positioned in a posture along the guide portion of the second member and in a posture in which the tip is in contact with one die, the one die is further It can move downward against the elasticity of the elastic material,
At the time of mold opening after foam molding, the first member can be pulled out from the second hole in which the molding core is formed while moving in the direction away from the second member together with one mold. An apparatus for manufacturing a foam molded container.   The apparatus for producing a foam-molded container according to claim 1, wherein the molding core is a plate-like member. The foam molded container is a cold storage container, the first hole is a drain hole, the second hole is a water guide hole for discharging water in the accommodation space to the first hole, and one mold is a core mold. And a bulging portion for forming a water pool at the bottom of the container, and the molding core is inclined obliquely downward when the mold is closed and the tip is in contact with the bulging portion of the core mold in foam molding containers of the manufacturing apparatus according to claim 1 or 2, characterized in that positioning is made. There is a housing space defined by the side wall and the bottom, a first hole penetrating in the vertical direction is formed in the side wall, and a second hole is formed to connect the first hole and the housing space. A method of manufacturing a foam molded container comprising:
As a member for forming the first hole, a first member having a flexible molding core for forming the second hole, and the molding core on the housing space side of the molding container Using a second member provided with a guide part that is directed toward the upper end side,
The first member is attached so as to be slidable on one mold via an elastic material , the second member is attached to the other mold so as to face the first member,
The molding core provided on the first member is a guide for the second member in a state in which both molds are brought close to each other, the end surfaces of the first member and the second member are in contact with each other, and a slight gap remains between the molds. After being filled with the pre-expanded particles in the cavity space formed between the two molds in the position along the part and in the position where the tip is in contact with one mold, Move the mold further downward against the elasticity of the elastic material to close the mold, then perform foam molding,
When the mold is opened after foam molding, the first member is moved together with one mold in a direction away from the second member, and the first member is molded while the molding core is extracted from the second hole formed. A method for producing a foam-molded container, comprising: extracting from a hole, and further extracting the second member together with the other mold from the first hole formed. The foam molded container is a cold storage container, the first hole is a drain hole, the second hole is a water guide hole for discharging water in the accommodation space to the first hole, and one mold is a core mold. And a bulging portion for forming a water reservoir at the bottom of the container, and the molding core is inclined obliquely downward when the mold is closed and the tip is in contact with the bulging portion of the core mold The method for manufacturing a foam-molded container according to claim 4 , wherein the positioning is performed by the step.

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