JP2013188911A - Method and device for manufacturing hollow container - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method and a device for manufacturing a hollow container capable of efficiently manufacturing the hollow container excellent in appearance and texture by dispensing with trimming or adhesion.SOLUTION: Fluid resin for a mold is poured into a form so that a cubic model is buried, and is hardened. After forming a curing mold 6, the curing mold 6 from which the cubic model is taken away by dividing on a split surface 7 is joined again so as to make the split surfaces 7 fit each other, and is inserted into a cylindrical holding frame 8 concentric with the curing mold 6. After pouring fluid resin for a container into an internal space of the curing mold 6, both end openings of the cylindrical holding frame 8 are mounted with rotary bearing plates 9 so as to block the both end openings. While the cylindrical holding frame 8 mounted with the rotary bearing plates 9 is rotated around the axis line, it is rotated around an axis orthogonal to the axis line. The fluid resin for a container is made to follow an inner surface of the curing mold 6 by the centrifugal force to be cured, which molds a hollow container.

Description

  The present invention relates to a method and an apparatus for manufacturing a hollow container.

  In general, a hollow container such as a hollow bottle filled with liquid such as hand soap, shampoo, or various beverages is manufactured by blow molding.

  In the blow molding, a molding material made of a thermoplastic resin is extruded from a die head, and the yet soft molding material just extruded from the die head is clamped by a pair of molding dies, and air is blown into the molding material to form the molding material. The material is made to follow the cavity provided in the mold, and after the molding material is cooled and solidified, the mold is opened and a hollow container as a molded product is taken out.

  By the way, in the trial production stage of the hollow container as described above, it is necessary to manufacture the sample product in order to confirm the design. Incidentally, the blow molding has a low manufacturing cost and is a very suitable method for mass production of hollow containers, but the molding die formed with a mold is very expensive and has a long delivery time. It is difficult to apply to the trial production of a sample product of the hollow container that is to be produced in a small amount.

  For this reason, in the conventional case, for example, a sample product of the hollow container has been prototyped by a method called thermoforming.

  In the thermoforming, as shown in FIG. 6, first, a hollow container product is designed, a two-dimensional drawing is produced, and a three-dimensional modeling is performed on the basis thereof to create processing data. The forming die 1 is manufactured by cutting.

  Subsequently, as shown in FIG. 7A, the thin plate-like thermoplastic resin sheet 2 is heated and softened by the heater 3, and the softened resin sheet 2 is shown in FIG. 7B. As shown in FIG. 7C, a state close to a vacuum is created by sucking air between the resin sheet 2 and the mold 1 while being placed on the mold 1. After the sheet 2 is brought into close contact and cured, and the molding is completed, the molded product 2a is taken out from the mold 1 as shown in FIG.

  Thereafter, unnecessary portions on the outer periphery of the molded product 2a are trimmed as shown in FIG. 8 (a) to form a half part 2b having a desired shape. As shown in FIG. 8 (b), two samples are prepared, face each other, and bonded together to produce a sample product of a hollow container.

  For example, Patent Document 1 shows a general technical level related to the manufacture of the hollow container as described above.

JP 2006-43977 A

  However, as described above, when the sample product of the hollow container is manufactured by thermoforming, in particular, unnecessary portions on the outer periphery of the molded product 2a are trimmed, or two halved parts 2b are prepared and face each other. It has a drawback that it takes much time and labor to bond.

  Further, in the thermoforming, as described above, two halved parts 2b are prepared and bonded face to face with each other. As a result, a joining line remains in the manufactured hollow container, and even a sample product has poor appearance and texture. Unlikely, improvements were desired.

  In view of such circumstances, the present invention is intended to provide a method and an apparatus for manufacturing a hollow container that can efficiently produce a hollow container with good appearance and texture without requiring trimming or adhesion.

The present invention includes a three-dimensional model production process for producing a three-dimensional model having the same outer shape as the hollow container to be manufactured;
Set the three-dimensional model manufactured in the three-dimensional model manufacturing process in the center of the mold that can be poured into the mold fluid resin, and then pour and mold the mold resin into the mold so that the three-dimensional model is buried. A mold forming step for forming a mold;
Removing the solid mold formed in the mold formation step from the mold, and dividing the solid model by a dividing plane including the axis of the solid model to remove the solid model from the hard mold; and
The hardening mold from which the three-dimensional model has been taken out in the three-dimensional model removal process is realigned so that the divided surfaces coincide with each other, and is inserted into a cylindrical holding frame concentric with the hardening mold, and the inner space of the hardening mold A resin injection step of attaching a rotary bearing plate to the both end openings of the cylindrical holding frame after injecting the fluid resin for the container to the both ends openings;
The cylindrical holding frame to which the rotary bearing plate is attached in the resin injection step is rotated around its axis while rotating around an axis perpendicular to the axis, and the fluid resin for containers is cured and molded by the centrifugal force. The present invention relates to a method of manufacturing a hollow container, characterized by performing a rotational molding step of molding the hollow container by curing following the inner surface of the mold.

  In the method for manufacturing the hollow container, the hollow container can be a prototype sample.

  In the method for producing the hollow container, the mold fluid resin can be a silicon resin in which a main agent and a curing agent are mixed, and the container fluid resin can be a curable urethane resin in which the main agent and a curing agent are mixed. .

On the other hand, according to the present invention, a three-dimensional model having the same outer shape as the hollow container to be manufactured is set in the center of the mold within which the mold fluid resin can be injected, and the mold model is buried in the mold fluid resin. A curing mold formed by pouring and curing;
A cylinder that is concentric with the curing mold that holds the outer periphery of the curing mold that is taken out by dividing it by a dividing plane that includes the axis of the three-dimensional model and is realigned so that the dividing plane matches. A holding frame,
After injecting the container flow resin into the internal space of the curing mold, a rotary bearing plate attached to the both end openings of the cylindrical holding frame so as to close the both end openings;
While the rotary bearing plate is gripped in a rotatable manner, the cylindrical holding frame is rotated around its axis, and is rotated around an axis orthogonal to the axis, and the fluid resin for the container is removed by centrifugal force. The present invention relates to an apparatus for manufacturing a hollow container, comprising: a biaxial rotator for forming a hollow container by curing in accordance with the inner surface of the curing mold.

In the manufacturing apparatus of the hollow container, a base with a built-in rotation drive device,
A U-shaped rotating frame attached to the base so as to be rotationally driven by a drive shaft extending in the horizontal direction of the rotational driving device;
Two pieces that are rotatably arranged around an axis perpendicular to the drive shaft so as to face each other at the U-shaped tip portion of the rotary frame and engage with a conical groove formed in the rotary bearing plate. A conical rotating piece of
The biaxial rotator can be constituted by a rotation transmission mechanism disposed inside the rotating frame and transmitting the rotation of the drive shaft to one rotating piece.

  In the hollow container manufacturing apparatus, the hollow container can be a prototype sample.

  In the hollow container manufacturing apparatus, the mold fluid resin can be a silicon resin in which a main agent and a curing agent are mixed, and the container fluid resin can be a curable urethane resin in which the main agent and a curing agent are mixed. .

  According to the above means, the following operation can be obtained.

  When configured as described above, compared to the conventional method of manufacturing a hollow container by thermoforming, trimming unnecessary portions on the outer periphery of the molded product, or preparing two halved parts and bonding them facing each other This saves time, saves time, and reduces the time required for manufacturing.

  Also, in the case of the present invention, unlike the thermoforming, two halved parts are not prepared and are not adhered to face each other, so there is no fear that the joint line remains in the manufactured hollow container. It looks good and feels close to the actual product, which is very effective for design confirmation.

  According to the method and apparatus for producing a hollow container of the present invention, it is possible to produce an excellent effect that a hollow container having good appearance and texture can be produced efficiently without requiring trimming or adhesion.

It is a schematic diagram which shows the process from the product design in the Example of the manufacturing method and apparatus of a hollow container of this invention to manufacture of a solid model. It is a schematic diagram which shows the process from formation of the shaping | molding die in the Example of the manufacturing method and apparatus of the hollow container of this invention to extraction of a solid model. The schematic diagram which shows the process from the insertion to the cylindrical holding frame of the shaping | molding die in the Example of the manufacturing method and apparatus of the hollow container of this invention to attachment of a rotating bearing plate, and the process of rotating a cylindrical holding frame. It is. It is a schematic block diagram which shows the biaxial rotator in the Example of the manufacturing method and apparatus of the hollow container of this invention. It is a schematic block diagram which shows the biaxial rotator in the Example of the manufacturing method and apparatus of the hollow container of this invention, Comprising: It is a VV arrow equivalent view of FIG. It is a schematic diagram which shows the process from product design to manufacture of a shaping | molding die in an example of the manufacturing method of the conventional hollow container. It is a schematic diagram which shows the process from the heating of the resin sheet to the taking-out of a molded article in an example of the manufacturing method of the conventional hollow container, (a) is a figure which shows the state which heats a resin sheet, (b) is a resin sheet The figure which shows the state which attracts | sucks the air between a mold and a mold, (c) is a figure which shows the state which closely_contact | adheres a resin sheet to a mold, (d) is a figure which shows the molded product taken out from the mold. It is a schematic diagram which shows the process from trimming of a molded article to adhesion | attachment in an example of the manufacturing method of the conventional hollow container, Comprising: (a) is a figure which shows the state which trims the outer peripheral part of a molded article, (b) is half It is a figure which shows the state which adhere | attaches and assembles components.

  Embodiments of the present invention will be described below with reference to the accompanying drawings.

  1 to 5 show an embodiment of a method and an apparatus for manufacturing a hollow container according to the present invention. First, as shown in FIG. 1, a hollow container product is designed to produce a two-dimensional drawing. 3D modeling is performed to create processing data, and a 3D model 4 having the same external shape as the hollow container to be manufactured is manufactured by cutting from a resin material (for example, urethane resin, epoxy resin, etc.) (3D model production) Process). In this case, the three-dimensional model 4 is solid.

  Subsequently, as shown in FIG. 2, the three-dimensional model 4 manufactured in the three-dimensional model manufacturing process is set in the center of the mold 5 where the mold fluid resin can be injected, and the mold fluid resin is placed in the mold 5. The three-dimensional model 4 is poured so as to be buried and cured to form a curing mold 6 (molding process). As the mold fluid resin, for example, a silicon resin in which a main agent and a curing agent (additive) are mixed can be used.

  Thereafter, the solid mold 4 formed in the mold forming step is removed from the mold 5 and divided by the dividing surface 7 including the axis of the solid model 4 to remove the solid model 4 from the hard mold 6 ( 3D model removal process).

  Subsequently, as shown in FIG. 3, the hardening mold 6 from which the three-dimensional model 4 has been taken out in the three-dimensional model removal process is aligned again so that the dividing surface 7 matches, and a cylindrical holding frame concentric with the hardening mold 6. 8 and injecting the fluid resin for the container into the internal space of the curing mold 6, and then attaching the rotary bearing plate 9 to the both end openings of the cylindrical holding frame 8 so as to close the both end openings (resin injection step) ). Here, when a horizontally long and box-shaped formwork 5 having an open upper surface as shown in FIG. 2 is used and the three-dimensional model 4 is fixed to the inner surface of the side surface portion in a cantilever manner, the cylindrical holding frame 8 is 3 is a rectangular tube with a square cross section, but instead of the mold 5 as shown in FIG. 2, a vertically placed hollow cylindrical mold is used, and the three-dimensional model is suspended on the inner surface of the upper surface. 4 is fixed, when the mold flow resin is poured from the hole drilled in the upper surface of the hollow cylindrical mold, the cylindrical holding frame 8 has a circular cross section shown in FIG. It can also be made. Needless to say, the cross-sectional shape of the cylindrical holding frame 8 is not limited to a quadrangle or a circle, but may be other shapes. Moreover, as said fluid resin for containers, the curable urethane resin which mixed the main ingredient and the hardening | curing agent (additive) can be used, for example.

  Further, the cylindrical holding frame 8 to which the rotary bearing plate 9 is attached in the resin injecting step is rotated around the axis perpendicular to the axis while rotating around the axis and the centrifugal force is used to flow the container. A hollow container is formed by curing the resin following the inner surface of the curing mold 6 (rotational molding process).

  Here, in the rotational molding step, a biaxial rotator 10 as shown in FIGS. 4 and 5 is used, and the biaxial rotator 10 incorporates a rotation drive device 12 such as a motor in a base 11. At the same time, a U-shaped rotating frame 14 that is rotationally driven by a drive shaft 13 that extends in the horizontal direction of the rotary drive device 12 is attached, and two conical rotations are attached to the U-shaped tip portion of the rotating frame 14. The pieces 15 are disposed so as to be rotatable about an axis that faces each other and is orthogonal to the drive shaft 13, and a conical groove 16 that is recessed in the rotary bearing plate 9 can be engaged with the rotary piece 15. A rotation transmission mechanism 17 for transmitting the rotation of the drive shaft 13 to one rotary piece 15 is disposed inside the rotary frame 14.

  The rotation transmission mechanism 17 includes a drive bevel gear 18 fitted to the tip of the drive shaft 13, and a driven shaft 19 extending in a direction orthogonal to the drive shaft 13 is illustrated in the internal space of the rotary frame 14. A driven bevel gear 20 that meshes with the drive bevel gear 18 is fitted to one end of the driven shaft 19 (on the drive shaft 13 side) and the other end of the driven shaft 19 (reverse drive). A pulley 21 is fitted on the shaft 13 side, and an endless belt 23 is looped between the pulley 21 and a pulley 22 provided at the base end of the one rotary piece 15. Yes.

  When the biaxial rotator 10 is used in the rotational molding step, the conical groove 16 of the rotary bearing plate 9 attached to the cylindrical holding frame 8 is engaged with the rotary piece 15 in the resin injection step. When the rotational drive device 12 is rotationally driven, the rotary frame 14 is rotationally driven by a drive shaft 13 extending in the horizontal direction, and the rotation of the drive shaft 13 constitutes a drive bevel gear 18 and a driven bevel gear constituting a rotation transmission mechanism 17. 20, the driven shaft 19, the pulley 21, the belt 23, and the pulley 22 are transmitted to one rotary piece 15, and the cylindrical holding frame 8 rotates about its axis, and the axis orthogonal to the axis is By rotating to the center, the container flow resin injected into the curing mold 6 by the centrifugal force is stretched to follow the inner surface of the curing mold 6 and cured, whereby the hollow container is formed. It is form. Incidentally, the rotational speed around the drive shaft 13 of the rotary frame 14 by the rotary drive device 12 and the rotational speed around the axis orthogonal to the drive shaft 13 of the cylindrical holding frame 8 are about 6 [rpm]. What is necessary is just to set to a grade.

  As a result, compared to the conventional case of producing a sample sample of a hollow container by thermoforming, unnecessary parts on the outer periphery of the molded product 2a are trimmed, or two halved parts 2b are prepared and bonded to each other. This saves time and labor and makes it possible to shorten the time required for manufacturing.

  Further, in the case of the present embodiment, unlike the thermoforming, two halved parts 2b are not prepared and bonded face to face with each other, so that there is a concern that a joining line remains in the manufactured hollow container. The sample product looks good and the texture is close to that of the actual product, which is very effective for design confirmation.

  Thus, it is possible to manufacture a hollow container with good appearance and texture without the need for trimming or adhesion.

  In addition, the manufacturing method and apparatus of the hollow container of the present invention are not limited to the above-described embodiments, and may be applied to the manufacture of actual products as well as the prototype samples. Of course, various modifications can be made without departing from the scope of the invention.

4 Solid Model 5 Mold 6 Curing Mold 7 Dividing Surface 8 Cylindrical Holding Frame 9 Rotating Bearing Plate 10 Biaxial Rotator 11 Base 12 Rotating Drive Device 13 Drive Shaft 14 Rotating Frame 15 Rotating Piece 16 Conical Groove 17 Rotation Transmission Mechanism

Claims (7)

A three-dimensional model production process for producing a three-dimensional model of the same outer shape as the hollow container to be manufactured;
Set the three-dimensional model manufactured in the three-dimensional model manufacturing process in the center of the mold that can be poured into the mold fluid resin, and then pour and mold the mold resin into the mold so that the three-dimensional model is buried. A mold forming step for forming a mold;
Removing the solid mold formed in the mold formation step from the mold, and dividing the solid model by a dividing plane including the axis of the solid model to remove the solid model from the hard mold; and
The hardening mold from which the three-dimensional model has been taken out in the three-dimensional model removal process is realigned so that the divided surfaces coincide with each other, and is inserted into a cylindrical holding frame concentric with the hardening mold, and the inner space of the hardening mold A resin injection step of attaching a rotary bearing plate to the both end openings of the cylindrical holding frame after injecting the fluid resin for the container to the both ends openings;
The cylindrical holding frame to which the rotary bearing plate is attached in the resin injection step is rotated around its axis while rotating around an axis perpendicular to the axis, and the fluid resin for containers is cured and molded by the centrifugal force. A method of manufacturing a hollow container, comprising: performing a rotational molding step of molding the hollow container by curing following the inner surface of the mold.   The method for producing a hollow container according to claim 1, wherein the hollow container is a prototype sample.   The method for producing a hollow container according to claim 1 or 2, wherein the mold fluid resin is a silicon resin in which a main agent and a curing agent are mixed, and the fluid resin for containers is a curable urethane resin in which the main agent and a curing agent are mixed. . A solid model having the same outer shape as the hollow container to be manufactured is set in the center of the mold within which the mold resin can be poured, and the mold model is poured into the mold so that the model is buried and cured. A curing mold formed by:
A cylinder that is concentric with the curing mold that holds the outer periphery of the curing mold that is taken out by dividing it by a dividing plane that includes the axis of the three-dimensional model and is realigned so that the dividing plane matches. A holding frame,
After injecting the container flow resin into the internal space of the curing mold, a rotary bearing plate attached to the both end openings of the cylindrical holding frame so as to close the both end openings;
While the rotary bearing plate is gripped in a rotatable manner, the cylindrical holding frame is rotated around its axis, and is rotated around an axis orthogonal to the axis, and the fluid resin for the container is removed by centrifugal force. An apparatus for manufacturing a hollow container, comprising: a biaxial rotator for forming a hollow container by curing in accordance with an inner surface of a curing mold. A base with a built-in rotary drive;
A U-shaped rotating frame attached to the base so as to be rotationally driven by a drive shaft extending in the horizontal direction of the rotational driving device;
Two pieces that are rotatably arranged around an axis perpendicular to the drive shaft so as to face each other at the U-shaped tip portion of the rotary frame and engage with a conical groove formed in the rotary bearing plate. A conical rotating piece of
The hollow container manufacturing apparatus according to claim 4, wherein the biaxial rotator is configured from a rotation transmission mechanism disposed inside the rotating frame and transmitting rotation of the drive shaft to one rotating piece.   The hollow container manufacturing apparatus according to claim 4 or 5, wherein the hollow container is a prototype sample.   The fluid resin for molds is a silicon resin in which a main agent and a curing agent are mixed, and the fluid resin for containers is a curable urethane resin in which a main agent and a curing agent are mixed. Equipment for manufacturing hollow containers.

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