JP2011131436A - Method and apparatus for manufacturing container lid with extensible cylindrical part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for manufacturing a container lid suitable for integrally forming an extensible cylindrical part at a part of the container lid of a container for microwave oven cooking. <P>SOLUTION: A primary molded article 40 of which a portion other than a cylindrical part 47 serving as the extensible cylindrical part 9 is of the same shape as the container lid 3 of a final molded article is molded out of thermoplastic resin. A lid top plate part 41 and an opening part flange 43 in the primary molded article 40 left as it is as the part of the container lid 3 are mechanically held from both sides and placed in a thermal deformation prevented state thermally intercepted from both sides. In this state, only the cylindrical part 47 is heated. The cylindrical part 47 after heated is biaxially extended to form a bellows-like extensible cylindrical part 9, thus obtaining the container lid 3 integrally formed with the extensible cylindrical part 9 causing neither thermal deformation nor thermal deterioration. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a method and an apparatus for manufacturing a container lid provided with a stretchable cylindrical portion used for a microwave cooking container or the like. In particular, the present invention relates to a manufacturing method and a manufacturing method for manufacturing a container lid provided with a stretchable cylindrical portion in which a portion being crushed with an increase in container internal pressure when heated by a microwave oven returns to its original length. Relates to the device.

  Patent Document 1 discloses a container having a container lid provided with a crushable elastic cylindrical portion, for example, a microwave cooking container. The microwave cooking container disclosed here is for holding a container main body, a container lid over the container main body, and an internal pressure of the container internal space formed by the container main body and the container lid at a predetermined value or less. It consists of three parts: a cap that functions as a pressure regulating valve. The cap is fitted in a through-hole formed in the container lid, and the container lid is formed with a stretchable cylindrical portion that can be crushed.

  A microwave cooking container with this configuration can be transported in a non-bulky state with almost the height of the container body only by crushing the elastic cylindrical part of the container lid with the cooking ingredients in it. is there. When this container is put into a microwave oven and heated, the internal pressure of the container increases due to the generated steam, and the elastic cylindrical part of the container lid that is crushed along with this expands or expands to return to its original shape. That is, there is an advantage that the container can be returned to a container having a large internal volume, and the steaming effect during cooking can be sufficiently exhibited.

  In Patent Document 1, a container lid having a stretchable cylindrical portion, a method of joining separately formed molding materials by heat sealing, and using a plastic material subjected to uneven thickness processing, a thin portion and a thick portion It is only described that it can be manufactured by a method such as vacuum / pressure forming integrally (paragraph 0016 of the document), and no specific manufacturing method or apparatus has been proposed.

  On the other hand, as described in Patent Documents 2 and 3, as a method of blow-molding a container such as a PET bottle that can expand and contract in the axial direction, the entire cylindrical body of the bolt is thin and bellows-shaped. In addition, a biaxial stretch blow molding method is known.

JP 2009-34410 A Japanese Patent Laid-Open No. 07-172424 JP 2006-51718 A

  An object of the present invention is to propose a manufacturing method and a manufacturing apparatus for a container lid suitable for integrally forming a stretchable cylindrical portion on a part of the container lid. In particular, an object of the present invention is to propose a container lid manufacturing method and a manufacturing apparatus suitable for integrally forming a stretchable cylindrical portion on a part of a container lid of a microwave oven cooking container.

In order to solve the above-described problems, the present invention includes a container body and a container lid, and as the container internal pressure increases, the squeezed elastic tubular portion of the container lid returns to its original shape. A method for producing a container lid for producing the container lid in a container configured as described above,
Primary molding made of a thermoplastic resin provided with a lid top plate portion, a cylindrical body portion formed integrally with the lid top plate portion, and a mouth flange formed integrally with an opening edge of the cylindrical body portion A partial heating step of heating a cylindrical portion of a predetermined width of the cylindrical body portion in a product to a temperature at which stretch molding is possible;
A partial molding step of performing biaxial stretch blow molding or vacuum / pressure forming on the cylindrical portion of the primary molded product, and molding the cylindrical portion into the stretchable cylindrical portion;
In the partial heating step, at least a portion including the lid top plate portion and the mouth flange in the primary molded product is mechanically sandwiched from both sides and thermally shielded from both sides to prevent thermal deformation of the portion. Forming a state, and in this state, heating the tubular portion of the tubular body,
The container lid is characterized by leaving a portion other than the cylindrical portion in the primary molded product as it is.

  Here, in the case where the container is a microwave cooking container, the stretchable cylindrical portion of the container lid is changed from the crushed state to the original shape as the container internal pressure increases during microwave heating. It is characterized by being able to return to.

  In conventional molded containers such as PET bottles and beverage cups, a test tube or bowl-shaped primary molded product formed so that only its mouth has the same shape as the final molded product is manufactured by injection molding. The entire body and bottom other than the above are heated and stretch-molded to produce a molded container. In the present invention, contrary to the prior art, a primary molded product having the same shape as the final molded product is prepared except for the cylindrical portion where the stretchable cylindrical portion is formed, and only the cylindrical portion is heated and stretched. The elastic tubular part is formed. Therefore, the container lid provided with the squeezable elastic cylindrical portion can be efficiently manufactured in a few steps with high accuracy.

  In addition, since the lid top plate portion in the primary molded product, the cylindrical body portion other than the cylindrical portion to be secondarily molded, and the mouth flange remain as the corresponding portions of the container lid that is the final molded product, It is necessary to prevent this part from being deformed during the secondary molding process. In particular, when the cylindrical body portion and the lid top plate portion other than the extended cylindrical portion are heated and deformed and deteriorated in the process of heating the cylindrical portion, the shape accuracy and characteristics of the container lid of the final product deteriorate. The evil that occurs occurs. Moreover, thermal deformation cannot be reliably prevented by simply covering these portions so as not to be exposed to heat from a heater or the like. In the present invention, these portions are mechanically sandwiched from both sides and a thermal deformation prevention state is formed in which they are thermally blocked from both sides, and only the cylindrical portion is heated in this state. Therefore, these portions can be reliably prevented from being heated and deformed, and a container lid with high shape accuracy can be obtained.

  Here, in order to maintain the shape of the lid top plate portion of the primary molded product, an outer shielding member having an outer masking surface having a shape corresponding to the outer peripheral surface shape of the lid top plate portion, and the lid top plate It is desirable to form the thermal deformation prevention state by sandwiching the lid top plate portion with an inner shielding member having an inner masking surface having a shape corresponding to the inner peripheral surface shape of the portion.

  In addition to this, in order to surely prevent heating of the part of the primary molded product other than the part that needs to be heated, at least one of the outer shielding member and the inner shielding member is predetermined. It is desirable to cool so as not to exceed the temperature.

  Next, in the manufacturing method of the present invention, the primary molded product is turned downward, and the mouth flange thereof is attached to the mounting surface of the lower mold for conveyance prepared in advance, and the mouth flange of the primary molded product is provided. A flange shielding member prepared in advance is fixed to the lower mold for conveyance so as to cover the back surface of the sheet, and a mounting state in which the mouth flange is sandwiched between the mounting surface and the flange shielding member is formed. It has the mounting process to perform. By sequentially performing the partial heating process and the partial molding process on the primary molded product mounted on the lower mold for conveyance, the container lid can be efficiently manufactured.

  In this case, the mounting surface has a shape corresponding to the surface shape of the mouth flange, and the shape of the flange masking surface that contacts the back surface of the mouth flange in the flange shielding member corresponds to the back surface shape of the mouth flange. As a shape, it is desirable that a thermal deformation prevention state of the mouth flange is formed by the mounting surface of the lower mold for conveyance and the flange shielding member.

  Further, in the partial heating step, by forming a state in which an outer peripheral surface portion of the cylindrical portion in the cylindrical trunk portion of the primary molded product is exposed from between the flange shielding member and the outer shielding member, Only the said cylindrical part can be heated from the outer peripheral side of the said cylindrical part.

  Next, in the manufacturing method of the present invention, prior to the mounting step, the primary molded product has a primary molding step of manufacturing a sheet material made of a thermoplastic resin by vacuum and pressure molding. It is a feature.

  The production method of the present invention is characterized in that, in the partial molding step, the cylindrical portion is stretch-molded into a bellows shape.

  Next, in the manufacturing method of the present invention, when a through hole is formed in the lid top plate portion of the primary molded product, the compressed air for molding does not leak from the through hole in the partial molding step. The biaxial stretch blow molding or the vacuum / pressure forming is performed with the through hole sealed.

Next, the present invention includes a container body and a container lid, and a container in which the stretchable cylindrical portion in the crushed state of the container lid returns to its original shape as the container internal pressure increases. A container lid manufacturing apparatus for manufacturing the container lid in
Primary molding made of a thermoplastic resin provided with a lid top plate portion, a cylindrical body portion formed integrally with the lid top plate portion, and a mouth flange formed integrally with an opening edge of the cylindrical body portion A transport unit for transporting goods,
A mounting station for mounting the primary molded product on the transport unit;
A partial heating station for heating a cylindrical portion of a predetermined width in the cylindrical body portion of the primary molded product to a temperature at which stretch molding is possible;
A partial molding station for performing biaxial stretch blow molding or vacuum / pressure forming on the cylindrical portion of the primary molded product, and molding the cylindrical portion into the stretchable cylindrical portion;
A transport mechanism for transporting the transport unit to the mounting station, the partial heating station, and the partial molding station;
The transport unit includes a lower mold for transport having a mounting surface on which the mouth flange of the primary molded product in a downward state is mounted, and the lid top plate portion of the primary molded product mounted on the mounting surface. An inner masking surface that covers the inner peripheral surface from the lower side is provided, and the inner shielding member that moves together with the lower mold for conveyance and the rear surface of the mouth flange of the primary molded product that is mounted on the mounting surface are masked. A flange shielding member that includes a flange masking surface and is detachably fixed to the lower mold for conveyance;
The partial heating station is configured to heat an outer shielding member having an outer masking surface having a shape corresponding to an outer peripheral surface shape of the lid top plate portion of the primary molded product, and the cylindrical portion of the primary molded product. A heating means, and an elevating means for elevating and lowering the outer shielding member and the heating means, and positioning the primary molded product mounted on the lower mold for conveyance directly under the outer shielding member, When the outer shielding member is lowered, the lid top plate portion is sandwiched between the outer shielding plate and the inner shielding member to form a thermal deformation preventing state of the lid top plate portion. A state where the outer peripheral surface portion of the cylindrical portion of the primary molded product is exposed from between the flange shielding members is formed, and the cylindrical portion is heated by the heating means from the outer peripheral side of the cylindrical portion. Characteristic It is.

  In the present invention, in the case where the container is a microwave cooking container, the stretchable cylindrical portion of the container lid is in an original shape from a crushed state as the container internal pressure increases due to microwave heating. It is characterized by being able to return to.

  In this case, it is preferable that a cooling unit that cools at least one of the outer shielding member and the inner shielding member so as not to reach a predetermined temperature or higher is desirable.

  Further, in the case where the heating means is provided with heating sources arranged at a plurality of locations so as to surround the outer shielding member, the outer shielding member can be rotated around its central axis by the elevating means. Rotating drive means for supporting and rotating the lower mold for conveyance and the inner shielding member integrally around their central axis, and arranging the outer shielding member between the inner shielding member and the primary molded product It is desirable to configure so as to rotate integrally with the inner shielding member in a state where the lid top plate portion is sandwiched.

  Furthermore, in the manufacturing apparatus of the present invention, the transport unit includes a support portion that supports the transport lower mold and the inner shielding member that are coaxially attached to an upper end, and can be rotated by the support portion. A lifting rod that is supported, lifting and lowering means for lifting and lowering the lifting rod in the direction of its central axis, and the primary molded product mounted on the lower mold for conveyance via a shaft hole formed in the lifting rod. And a compressed air supply path for supplying compressed air for molding to the inner space.

  The partial molding station includes: an open / close die that opens and closes in a horizontal direction; a horizontal mold clamping mechanism that opens and closes the open / close die; and a liftable die that lowers the open / close die and clamps the lower die for conveyance. The primary molded product having a fastening mechanism, and having an accordion-shaped molding surface formed on the cylindrical portion formed on an inner peripheral surface of the opening / closing mold, and being mounted on the lower mold for conveyance Is positioned directly below the opening and closing mold, the clamped opening and closing mold is lowered and clamped to the movable lower mold, and in this state, the compressed air is supplied by the compressed air supply mechanism while the compressed air is supplied. By pushing the stretching rod upward, the tubular portion is formed into the stretchable tubular portion that can be crushed.

  Here, in the case where a through hole is formed in the lid top plate portion of the primary molded product, the partial molding station sets the through hole of the primary molded product positioned directly below the open / close mold upward. The sealing member is provided with a sealing member, and the sealing member rises together with the inner shielding member.

  In the present invention, a primary molded product having the same shape as the final molded product is prepared except for the cylindrical portion where the stretchable cylindrical portion is formed, and only the tubular portion is heated and stretched to stretch the tubular shape. Molding part. Therefore, the container lid provided with the squeezable stretchable cylindrical portion can be efficiently manufactured with few steps with high accuracy. In addition, a part such as the lid top plate portion of the primary molded product remaining as a container lid part of the final molded product is mechanically sandwiched from both sides and thermally blocked from both sides to prevent thermal deformation. Only the shaped part is heated. Therefore, it is possible to reliably prevent these portions from being heated and thermally deformed, and to obtain a container lid having a stretchable cylindrical portion with high shape accuracy.

It is explanatory drawing which shows an example of the container for microwave oven cooking. It is a schematic block diagram which shows the manufacturing apparatus of the container lid to which this invention is applied, and a perspective view which shows a primary molded product. FIG. 2 is a partial configuration diagram illustrating a mounting station of the manufacturing apparatus of FIG. 1 and a partially enlarged explanatory view illustrating a transport unit mounted with a primary molded product. FIG. 2 is a partial configuration diagram showing a partial heating station of the manufacturing apparatus of FIG. 1 and a partially enlarged explanatory view showing a state where a primary molded product is masked. FIG. 2 is a partial configuration diagram showing a partial molding station of the manufacturing apparatus of FIG. 1 and a partial configuration diagram when cut from an orthogonal direction. It is explanatory drawing which shows another structural example of a partial shaping | molding station.

  Hereinafter, with reference to the drawings, an embodiment of a device for producing a container lid of a microwave cooking container to which the present invention is applied will be described.

[Configuration example of container lid]
Prior to the description of the manufacturing apparatus, an example of a container lid of a microwave cooking container to be manufactured will be described with reference to FIG. FIG. 1 is an exploded perspective view showing an example of a microwave cooking container. The microwave cooking container 1 is a molded product of a thermoplastic resin, and a container body 2 and a container that is detachably covered on the container body 2. It has the lid | cover 3 and the cap 5 which has sealed the through-hole 4 formed in the container lid | cover 3 so that attachment or detachment is possible. The container lid 3 and the cap 5 form a pressure regulating valve mechanism for holding the internal pressure of the container internal space formed by the container body 2 and the container lid 3 at a predetermined value or less.

  The container lid 3 includes a mouth flange 6 that is detachably fitted to the body-side opening edge 2 a of the container body 2, and a cylindrical body having a diameter that gradually decreases upward continuously from the mouth flange 6. 7 and a disc-shaped lid top plate portion 8 formed continuously from the upper end edge of the cylindrical body portion 7. A circular concave portion 8a is formed at the center of the lid top plate portion 8, and a circular through hole 4 is formed on the circular bottom surface of the circular concave portion 8a. The through hole 4 is sealed with a disk-shaped cap 5. The cap 5 includes a convex portion 5a that can be fitted into the circular concave portion 8a, and a steam escape groove 8b is formed on the inner peripheral side surface of the circular concave portion 8a. Thereby, when the vapor pressure generated inside the container becomes a predetermined value or more, a pressure regulating valve mechanism is formed in which the vapor escapes, pushes up the outer peripheral edge portion of the cap 5 through the groove 8b, and is discharged to the outside.

  Here, in the cylindrical body portion 7 of the container lid 3, a portion having a predetermined width in the direction of the central axis 7 a of the cylindrical body portion 7 is a bellows-like stretchable tubular portion 9. The stretchable cylindrical portion 9 can be crushed in the direction of the central axis 7a, and can be expanded to the original shape before being crushed as the container internal pressure increases in the crushed state. The portion between the stretchable cylindrical portion 9 and the mouth flange 6 in the cylindrical body portion 7 and the portion between the stretchable tubular portion 9 and the lid top plate portion 8 are not crushed. Cylindrical portions 10 and 11 are formed.

  In the container lid 3 of the present embodiment, the stretchable cylindrical portion 9 has a bellows shape. The stretchable cylindrical portion 9 is not limited to a bellows-like shape as long as it can be crushed and can be expanded to the shape before being crushed as the container internal pressure rises in the crushed state. Absent. For example, the stretchable tubular portion 9 can be a thin flat film.

[Manufacturing device for container lid 3]
(overall structure)
A container lid manufacturing apparatus according to an embodiment of the present invention will be described with reference to FIGS.

  First, the whole structure of the manufacturing apparatus 20 is demonstrated with reference to Fig.2 (a). The manufacturing apparatus 20 includes an apparatus mount 21, and a guide rail 23 extending in the longitudinal direction of the apparatus is disposed on a horizontal top surface 22 of the apparatus mount 21, and the transport unit 30 extends along the guide rail 23. It can slide.

  On the apparatus base 21, along the guide rail 23, a mounting station 50 for mounting the primary molded product 40 for manufacturing the container lid 3 to the transport unit 30, and a partial heating station 60 for heating a part of the primary molded product 40. , And a partial molding station 70 for partially molding the primary molded product 40 is disposed. The conveyance unit 30 is linearly reciprocated along the guide rail 23 by the conveyance means including the air cylinder 24. The air cylinder 24 is bridged between the apparatus base 21 and the transport unit 30 so as to extend parallel to the guide rail 23.

(Primary molded product)
As can be seen from FIG. 2 (b), the primary molded product 40 attached to the transport unit 30 is made of a thermoplastic resin, and a lid top plate portion 41 and a cylindrical body portion integrally formed with the lid top plate portion 41. 42 and a mouth flange 43 formed integrally with the opening edge of the cylindrical body portion 42. A through hole 44 is formed in the center of the lid top plate portion 41. The primary molded product 40 is formed in the same shape as the corresponding part (the lid top plate portion 8 and the mouth flange 6) of the container lid 3 which is the final molded product, except for the cylindrical body portion 42. It remains as a part. The cylindrical body portion 42 is formed into cylindrical portions 45 and 46 having the same shape as the cylindrical portions 10 and 11 of the cylindrical body portion 7 of the container lid 3 at both ends in the central axis direction 40a. The portion is a cylindrical tubular portion 47 that is thicker and narrower than the bellows-like stretchable tubular portion 9. The thickness of the cylindrical portion 47 is the same as the thickness of the cylindrical portions 45 and 46 on both sides (see FIG. 3B).

  The primary molded product 40 of this shape is manufactured by vacuum / pressure forming a sheet material made of a thermoplastic resin, but can also be manufactured by injection molding. Moreover, the thickness of the cylindrical part 47 of the primary molded product 40 may be thicker than the cylindrical parts 45 and 46 on both sides according to the shape of the stretchable cylindrical part 9, the draw ratio, and the like. For example, it may be thickened when the tubular portion 47 is greatly stretched to form the stretchable tubular portion 9. Conversely, it may be desirable to make the tubular portion 47 thinner than the portions on both sides.

  Further, the primary molded product 40 has a cylindrical truncated portion 47 that is tapered from the mouth flange 43 toward the lid top plate portion 41, and has a predetermined thickness (depth) as a whole. Or cup-shaped. By inclining the cylindrical part 47 from the direction orthogonal to the lid top plate part 41, the primary molded product 40 can be made thin, and its bulkiness can be suppressed. Further, depending on the shape of the container lid 3 which is the final molded product, the overall shape of the primary molded product 40 can be made a flat plate or a shape close to a flat plate by making the inclination of the cylindrical portion 47 as small as possible. In this way, there is an advantage that it does not take up space for storage and transportation.

(Transport unit)
Referring to FIG. 3, the transport unit 30 includes a transport base 31 that can slide along the guide rail 23. The transport base 31 locks the transport base 31 at a predetermined slide position. The air cylinder 31a for locking is mounted. Further, an outer cylinder 32 is vertically fixed to the transport table 31 so as to penetrate the transport table 31. An inner cylinder 34 is supported on the inner side of the outer cylinder 32 through upper and lower bearings 33 in a coaxial state in a rotatable state. The upper end portion of the inner cylinder 34 is a large-diameter annular flange projecting upward from the outer cylinder 32, and a support base 35 is fixed horizontally on the upper surface in a coaxial state. A lower transfer die 36 is fixed on the upper surface of the support base 35 in a coaxial state.

  Through holes are formed at the centers of the support base 35 and the lower transfer die 36, and a lifting rod 37 extends vertically through these through holes and the center hole of the inner cylinder 34. The elevating rod 37 is connected to the inner cylinder 34 so as to rotate integrally therewith, but is movable up and down in the direction of the central axis 37 a with respect to the inner cylinder 34. A disc-shaped inner shielding plate 38 is fixed in a coaxial state in a horizontal state at an upper end portion of the lifting rod 37 protruding upward from the lower transfer die 36.

  The lower end side of the elevating rod 37 protrudes downward from the inner cylinder 34, and the lower end thereof is coaxially connected to the air cylinder 39 a of the rod elevating mechanism 39. The rod lifting mechanism 39 is suspended from the lower side of the transport table 31. The lifting / lowering rod 37 can be moved up and down between the position shown in FIG. 3 and a position above this by the rod lifting mechanism 39. A shaft hole 37b is formed in the elevating rod 37. The upper end of the shaft hole 37b communicates with the outside at the lower portion of the inner shielding plate 38, and the lower end of the shaft hole 37b is compressed air (not shown). It communicates with a supply path for compressed air supplied from a supply source.

  If it demonstrates with reference to FIG.3 (b), the annular | circular shaped mounting surface 36a which can mount | wear with the primary molded product 40 from the upper side is formed in the upper surface of the lower mold | type 36 for conveyance. The mounting surface 36 a is a lower masking surface 36 b having a shape corresponding to the surface shape of the annular mouth flange 43 of the primary molded product 40 and the inner peripheral surface shape of the cylindrical portion 45 continuing to the mouth flange 43. It has. Therefore, the primary molded product 40 mounted on the mounting surface 36a is in a state where the surface of the mouth flange 43 and the inner peripheral surface portion of the cylindrical portion 45 are covered with the lower masking surface 36b.

  Further, the manufacturing apparatus 20 includes an annular flange shielding plate 25 for covering the mouth flange 43 of the primary molded product 40 mounted on the mounting surface 36a of the lower transfer mold 36 from above. The flange shielding plate 25 includes a flange masking surface 25a having a shape corresponding to the back surface of the mouth flange 43 of the primary molded product 40 and the outer peripheral surface of the cylindrical portion 45 continuous thereto. Further, an annular inner peripheral surface extending in the central axis direction is formed continuously with the outer peripheral edge of the flange masking surface 25a, and a female screw 25b is formed here. A male screw 36c that can be screwed into the female screw 25b is formed on the outer peripheral end surface of the annular mounting surface 36a of the lower transfer die 36. Therefore, the mouth flange 43 of the primary molded product 40 is mounted on the mounting surface 35a in a downward state, the flange shielding plate 25 is placed on the mouth flange 43 from above, and the flange shielding plate 25 is screwed into the lower mold 36 for conveyance. Can be fixed. In this state, as can be seen from FIG. 3B, the mouth flange 43 of the primary molded product 40 and the cylindrical portion 45 continuous thereto are sandwiched and covered by the mounting surface 36a and the flange shielding plate 25 from both sides. It is.

  Next, on the upper surface of the inner shielding plate 38 that is horizontally attached to the upper end of the lifting rod 37, the inner peripheral surface of the lid top plate portion 41 of the primary molded product 40 and the inner portion of the cylindrical portion 46 that is continuous therewith are provided. An inner masking surface 38a having a shape corresponding to the peripheral surface is formed. When the primary molded product 40 is mounted on the mounting surface 35a, the inner masking surface 38a of the inner shielding plate 38 is in close contact with the inner peripheral surface of the lid top plate portion 41 of the primary molded product 40 and the inner peripheral surface of the cylindrical portion 46. State, and these parts are obscured.

(Installation station)
In the mounting station 50, the primary molded product 40 taken out from a primary molded product supply unit (not shown) is mounted on the transport unit 30 waiting in the mounting station 50. As shown in FIG. 3, the primary molded product 40 is placed on the lower transfer mold 36 of the transfer unit 30 positioned at the mounting position 50 a of the mounting station 50 from directly above. Next, the flange shielding plate 25 is screwed and fixed to the lower transfer mold 36 from above. Thereby, as shown in FIG.3 (b), the state with which the primary molded article 40 was mounted | worn with the conveyance unit 30 is formed.

(Partial heating station)
With reference to Fig.4 (a), the partial heating station 60 which heats only the cylindrical part 47 of the primary molded article 40 to the temperature which can be stretch-molded is demonstrated. The partial heating station 60 includes a support frame 61 that extends upward from the top surface 22 of the apparatus mount 21, and an upper end horizontal frame portion 61 a of the support frame 61 includes an air cylinder 62 a that is vertically attached downward. The lifting / lowering means 62 is attached. A lifting frame 63 is attached to the operating rod 62b of the air cylinder 62a, and the lifting frame 63 is guided by a vertical frame portion 61b of the support frame 61 to move up and down.

  A disc-shaped outer shielding plate 64 is attached to the center of the elevating frame 63 so as to be horizontally rotatable. A flat circular outer masking end surface 64 a corresponding to the outer peripheral surface shape of the lid top plate portion 41 of the primary molded product 40 is formed on the lower surface of the outer shielding plate 64. Further, the outer peripheral edge of the outer shielding plate 64 is an annular edge 64b bent at a right angle downward, and the circular inner peripheral surface of the annular edge 64b is continuous with the lid top plate portion 41 of the primary molded product 40. An outer masking inner peripheral surface 64c that can cover the cylindrical portion 46 from the outside is formed.

  A heat radiating pipe 65 is horizontally disposed on both sides of the outer side shielding plate 64 in the moving direction of the transport unit. These heat radiating pipes 65 are attached to the lifting frame 63 and move up and down together with the lifting frame 63.

  The outer shielding plate 64 and the heat radiating pipe 65 attached to the elevating frame 63 stand by at an upper standby position shown in FIG. When the transport unit 30 is positioned at the partial heating position 60a, the primary molded product 40 attached thereto is positioned coaxially just below the outer shielding plate 64 at the standby position. When the elevating frame 63 is lowered, the outer masking end face 64 a of the outer shielding plate 64 can be brought into close contact with the outer peripheral surface of the lid top plate portion 41 of the primary molded product 40.

  As shown in FIG. 4B, in this state, the lid top plate portion 41 of the primary molded product 40 is sandwiched between the outer shielding plate 64 and the inner shielding plate 38 on the transport unit 30 side, and the lid The heat deformation prevention state of the top plate portion 41 is formed. Further, the outer peripheral surface of the cylindrical portion 46 continuing to the lid top plate portion 41 is covered with the masking inner peripheral surface 64c of the outer shielding plate 64 from the outside. Accordingly, a state is formed in which only the outer peripheral surface portion of the tubular portion 47 of the primary molded product 40 is exposed from between the outer shielding plate 64 and the flange shielding plate 25 on the transport unit 30 side. Therefore, by the heat radiating pipes 65 positioned on both sides of the outer shielding plate 64, only the tubular part 47 can be heated by irradiating only the tubular part 47 from the outer peripheral side of the tubular part 47.

  Further, in the transport unit 30, the lifting rod 37 to which the inner cylinder 34, the support base 35, the lower transporting mold 36 and the inner shielding plate 38 are attached is rotated by the outer cylinder 32 in a state of being rotatable around the central axis thereof. It is supported. Therefore, in the partial heating station 60, by rotating them, each part of the cylindrical portion 47 of the primary molded product 40 repeatedly passes through the heat radiation area by the heat radiation pipes 65 located on both sides. The part 47 can be heated uniformly in the circumferential direction.

  Here, it is desirable to arrange cooling means for cooling at least one of the outer shielding plate 64 and the inner shielding plate 38, for example, the outer shielding plate 64, so that the outer shielding plate 64 is not heated above a predetermined temperature. For example, if the refrigerant circulation path is formed inside the outer shielding plate 64 and the outer shielding plate 64 is cooled by circulating the refrigerant, it is ensured that the lid top plate portion 41 of the primary molded product 40 is heated. Since it can prevent, it is preferable.

  In addition, as a heating means for heating the cylindrical part 47 of the primary molded product 40, various things other than a heat radiating tube, such as what blows hot air, what uses a heater by a nichrome wire, etc. can be used.

(Partial molding station)
FIG. 5A is a schematic configuration diagram showing the partial molding station 70, and FIG. 5B is a schematic configuration diagram when the partial molding station 70 is viewed from a direction orthogonal to the transport direction of the transport unit 30. . The partial molding station 70 includes a support frame 71 erected above the top surface 22 of the apparatus base 21, and an elevating type having an air cylinder 72 a at the center of the upper horizontal frame portion 71 a of the support frame 71. A mold clamping mechanism 72 is attached. On the elevating frame 72b of the elevating mold clamping mechanism 72, an open / close mold 73 including left and right split molds 73a and 73b that can be opened and closed in a horizontal direction perpendicular to the transport direction of the transport unit 30 is mounted. The left and right split molds 73a and 73b are opened and closed by a horizontal mold clamping mechanism 74 including left and right air cylinders 74a and 74b mounted on the lifting frame 72b.

  The open / close die 73 is formed with a cylindrical cavity 73c that opens downward, and a bellows formed on the tubular portion 47 of the primary molded product 40 is formed on the molding surface forming the cavity 73c. A shaped molding surface is formed. When forming a flat film-like stretchable tubular portion instead of the bellows-like stretchable tubular portion 9, the shape of the open / close mold surface is also a flat frustum-shaped inner periphery corresponding thereto. It is considered a surface.

  The open / close mold 73 is in the standby position in the upper position shown in FIG. When the transport unit 30 is positioned at the partial molding position 70 a, the primary molded product 40 mounted thereon is positioned directly below the open / close mold 73. When the open / close mold 73 in the mold open state is lowered in this state, the lower surface of the lift frame 72 hits the cushion pin 35a protruding upward from the support base 35 on the transport unit 30 side, and the open / close mold 73 is applied with a predetermined force. Is formed in a state of being clamped to the lower transport die 36. In this state, the open / close mold 73 is clamped by the horizontal mold clamping mechanism 74.

  FIG. 6 is an explanatory view showing a state after mold clamping. After the clamping state is formed, the lifting rod 37 is pushed upward while supplying compressed air to the inside of the primary molded product 40 through the shaft hole 37a of the lifting rod 37. As a result, the cylindrical portion 47 is stretched in the biaxial direction and formed into a bellows-like stretchable cylindrical portion 9 that can be crushed.

  Here, a through hole 44 is formed in the lid top plate portion 41 of the primary molded product 40. The partial molding station 70 includes a sealing plug 75 that seals the through hole 44 of the primary molded product 40 positioned directly below the opening / closing mold 73 from above. As shown in FIG. 6, the through hole 44 is sealed by the plug 75 for sealing in the mold-clamping state of the open / close mold 73. This sealed state is maintained during molding. That is, the sealing plug 75 rises together with the lifting rod 37.

  Thus, the container lid 3 is manufactured from the primary molded product 40 by forming the cylindrical portion 47 of the primary molded product 40 into the bellows-like stretchable cylindrical portion 9. After molding, the open / close mold 73 is opened to the left and right, and then the open / close mold 73 is raised and returned to the standby position. Thereafter, after the flange shielding plate 25 is removed by a collection mechanism (not shown), the container lid 3 is collected from the lower transfer mold 36 and collected in a predetermined collection place.

[Description of molding operation]
Below, the manufacturing process of the container lid 3 by the manufacturing apparatus 20 is demonstrated collectively. First, as shown in FIG. 3, the transport unit 30 is positioned at the mounting position 50a, and the primary molded product 40 is mounted on the mounting surface 36a of the lower transport mold 36 in a downward state. Then, the flange shielding plate 25 is screwed and fixed to the lower mold 36 for conveyance so as to cover the back surface of the mouth flange 43 of the primary molded product 40. Thereby, a mounting state in which the mouth flange 43 is sandwiched between the mounting surface 36a and the flange shielding plate 25 is formed. In other words, the mounting flange 36a of the lower transfer mold 36 and the flange shielding plate 25 form a thermal deformation prevention state of the mouth flange 43.

  Next, the transfer unit 30 is transferred to the partial heating station 60 and positioned at the partial heating position 60a. In the partial heating station 60, the outer shielding plate 64 having an outer masking surface having a shape corresponding to the outer peripheral surface shape of the lid top plate portion 41 of the primary molded product 40 and the inner peripheral surface shape of the lid top plate portion 41 are supported. The lid top plate portion 41 is sandwiched between the inner shielding plate 38 having the shape of the inner masking surface, and a state of preventing thermal deformation of the lid top plate portion 41 is formed. In addition, the cylindrical portions 45 and 46 in the primary molded product 40 are also covered with both sides.

  In this state, the tubular portion 47 of the primary molded product 40 is heated by the heat radiating tube 65 from the outside. At the time of heating, since the primary molded product 40 is rotated, each portion of the cylindrical portion 47 in the circumferential direction is uniformly heated to a temperature suitable for stretch molding. Further, since the lid top plate portion 41 is covered and hidden so as not to be exposed to heat while being mechanically sandwiched from above and below, the lid top plate portion 41 is reliably prevented from being deformed. Furthermore, since the outer shielding plate 64 is prevented from being cooled and heated to a predetermined temperature or more, the lid top plate portion 41 is also reliably prevented from being deteriorated by heating.

  After heating, the transport unit 30 is positioned at the partial molding position 70a of the partial molding station 70, and the cylindrical portion 47 of the primary molded product 40 is biaxially stretched to form the bellows-like stretchable cylindrical portion 9. The

(Other embodiments)
In addition, said embodiment is related with the container lid of the container for microwave oven cooking. The present invention can be applied to a container lid other than the container lid of a microwave cooking container to integrally mold the stretchable cylindrical portion.

DESCRIPTION OF SYMBOLS 1 Microwave cooking container 2 Container main body 3 Container lid 4 Through-hole 5 Cap 6 Mouth flange 7 Cylindrical body part 8 Cover top plate part 8a Circular recessed part 8b Relief groove 9 Stretchable cylindrical part 10 Cylindrical part 11 Cylindrical part 20 Manufacturing equipment 21 Equipment base 22 Top face 23 Guide rail 24 Air cylinder 25 Flange shielding plate 25a Flange masking face 25b Female screw 30 Transport unit 31 Transport base 31a Locking air cylinder 32 Outer cylinder 33 Bearing 34 Inner cylinder 35 Support base 36 Lower transport Mold 36a Mounting surface 36b Lower masking surface 36c Male screw 37 Lifting rod 37a Center axis 37b Shaft hole 38 Inner shielding plate 38a Inner masking surface 39 Rod lifting mechanism 39a Air cylinder

40 Primary molded product 41 Lid top plate part 42 Cylindrical body part 43 Opening flange 44 Through holes 45, 46 Cylindrical part 47 Cylindrical part

50 Mounting station 50a Mounting position

60 Partial heating station 61 Support frame 61a Upper horizontal frame portion 61b Vertical frame portion 62 Lifting means 62a Air cylinder 62b Actuating rod 63 Lifting frame 64 Outer shielding plate 64a Outer masking end face 64b Annular edge 64c Outer masking inner peripheral surface 65 Radiation pipe

70 Partial molding station 70a Partial molding position 71 Support frame 71a Upper horizontal frame part 72 Elevating mold clamping mechanism 72a Air cylinder 72b Elevating frame 73 Opening / closing mold 73a, 73b Split mold 73c Cavity 74 Horizontal mold clamping mechanisms 74a, 74b Air cylinder 75 For sealing plug

Claims (14)

A container main body (2) and a container lid (3) are provided, and as the container internal pressure increases, the squeezed elastic tubular portion (9) in the container lid (3) returns to its original shape. A container lid manufacturing method for manufacturing the container lid (3) in the container (1),
The lid top plate portion (41), the cylindrical body portion (42) formed integrally with the lid top plate portion (41), and the mouth formed integrally with the opening edge of the cylindrical body portion (42) A partial heating step of heating the cylindrical portion (47) having a predetermined width of the cylindrical body portion (42) in the primary molded product (40) made of a thermoplastic resin provided with the flange portion (43) to a temperature at which stretch molding is possible. When,
The tubular part (47) of the primary molded product (40) is subjected to biaxial stretch blow molding or vacuum / pressure forming to form the tubular part (47) into the stretchable tubular part (9). A partial molding process,
In the partial heating step, at least a portion including the lid top plate portion (41) and the mouth flange (43) in the primary molded product (40) is mechanically sandwiched from both sides and thermally shielded from both sides. By forming a thermal deformation prevention state of the part, the cylindrical portion (47) of the cylindrical body (42) is heated in this state,
A method for producing a container lid, wherein the container lid (3) is left with a portion other than the cylindrical portion (47) in the primary molded product (40) as it is. In claim 1,
The container (1) is a microwave cooking container,
The stretchable cylindrical portion (9) of the container lid (3) is configured to return to its original shape from a crushed state as the container internal pressure increases due to microwave heating. A method for manufacturing a container lid. In claim 2,
In the partial heating step, an outer shielding member (64) having an outer masking surface (64a) having a shape corresponding to at least a part of the outer peripheral surface shape of the lid top plate portion (41), and the lid top plate portion ( 41) and sandwiching the lid top plate portion (41) between the inner shielding member (38) having an inner masking surface (38a) having a shape corresponding to at least a part of the inner peripheral surface shape of the inner peripheral surface shape 41). A method for producing a container lid, characterized by forming a deformation prevention state. In claim 3,
A method for producing a container lid, wherein at least one of the outer shielding member (64) and the inner shielding member (38) is cooled so as not to exceed a predetermined temperature. In claim 4,
The primary molded product (40) is turned downward, and its mouth flange (43) is mounted on the mounting surface (36a) of the lower mold for transport (36) prepared in advance, and the primary molded product (40). The flange shielding member (25) prepared in advance is fixed to the lower mold for transportation (36) so as to cover the back surface of the mouth flange (43), and the mounting surface (36a) and the flange A mounting step of forming a mounting state in which the mouth flange (43) is sandwiched between shielding members (25);
The mounting surface (36a) has a shape corresponding to the surface shape of the mouth flange (43), and the flange masking surface (25a) of the flange shielding member (25) is in contact with the back surface of the mouth flange (43). The shape of the mouth flange (43) is determined by the mounting surface (36a) and the flange shielding member (25) of the lower mold for transportation (36) so that the shape corresponds to the shape of the back surface of the mouth flange (43). The thermal deformation prevention state of
In the partial heating step, between the flange shielding member (25) and the outer shielding member (64), the tubular portion (47) of the tubular body (42) of the primary molded product (40) is formed. A method for producing a container lid, wherein the outer peripheral surface portion is exposed and the cylindrical portion (47) is heated from the outer peripheral side of the cylindrical portion (47). In claim 5,
Prior to the mounting step, the primary molded product (40) has a primary molding step in which a sheet material made of a thermoplastic resin is manufactured by vacuum and pressure molding. Method. In any one of claims 1 to 6,
In the partial molding step, the cylindrical portion (47) is stretched and formed into a bellows shape. In any one of claims 1 to 7,
A through hole (44) is formed in the lid top plate portion (41) of the primary molded product (40),
In the partial molding step, the biaxial stretch blow molding or the vacuum / pressure forming is performed in a state where the through hole (44) is sealed. A container main body (2) and a container lid (3) are provided, and as the container internal pressure increases, the squeezed elastic tubular portion (9) in the container lid (3) returns to its original shape. A container lid manufacturing apparatus (20) for manufacturing the container lid (3) in the container (1),
The lid top plate portion (41), the cylindrical body portion (42) formed integrally with the lid top plate portion (41), and the mouth formed integrally with the opening edge of the cylindrical body portion (42) A transport unit (30) for transporting a primary molded product (40) made of a thermoplastic resin provided with a part flange (43);
A mounting station (50) for mounting the primary molded product (40) on the transport unit (30);
A partial heating station (60) for heating the cylindrical portion (47) having a predetermined width in the cylindrical body (42) of the primary molded product (40) to a temperature at which stretch molding is possible;
The tubular part (47) of the primary molded product (40) is subjected to biaxial stretch blow molding or vacuum / pressure forming to form the tubular part (47) into the stretchable tubular part (9). A partial molding station (70);
A transport mechanism (23, 24) for transporting the transport unit (30) to the mounting station (50), the partial heating station (60), and the partial molding station (70);
The transport unit (30)
A lower die for transport (36) provided with a mounting surface (36a) to which the mouth flange (43) of the primary molded product (40) in the downward state is mounted;
An inner masking surface (38a) that covers an inner peripheral surface of the lid top plate portion (41) of the primary molded product (40) mounted on the mounting surface (36a) from below; An inner shielding member (38) moving with the mold (36);
Provided with a flange masking surface (25a) for covering the back surface of the mouth flange (43) of the primary molded product (40) mounted on the mounting surface (36a), with respect to the lower mold for conveyance (36) A flange shielding member (25) fixed detachably,
The partial heating station (60)
An outer shielding member (64) having an outer masking surface (64a) having a shape corresponding to the outer peripheral surface shape of the lid top plate portion (41) of the primary molded product (40);
Heating means (65) for heating the tubular portion (47) of the primary molded article (40);
Elevating means (62) for elevating and lowering the outer shielding member (64) and the heating means (65),
When the primary molded product (40) mounted on the lower transfer mold (36) is positioned directly below the outer shielding member (64) and the outer shielding member (64) is lowered, the outer shielding is performed. The lid top plate portion (41) is sandwiched between the plate (64) and the inner shielding member (38) to form a thermal deformation preventing state of the lid top plate portion (41). These outer shielding members ( 64) and the flange shielding member (25), a state in which the outer peripheral surface portion of the cylindrical portion (47) of the primary molded product (40) is exposed is formed, and the outer periphery of the cylindrical portion (47) is formed. The apparatus (20) for manufacturing a container lid, wherein the cylindrical portion (47) is heated from the side by the heating means (65). In claim 9,
The container (1) is a microwave cooking container,
The stretchable cylindrical portion (9) of the container lid (3) is configured to return to its original shape from a crushed state as the container internal pressure increases due to microwave heating. The container lid manufacturing apparatus (20). In claim 10,
A container lid manufacturing apparatus (20) comprising a cooling means for cooling at least one of the outer shielding member (64) and the inner shielding member (38) so as not to exceed a predetermined temperature. . In claim 10 or 11,
The heating means (65) includes a heating source disposed at a plurality of locations in a state of surrounding the outer shielding member (64),
The outer shielding member (64) is supported by the elevating means (62) so as to be rotatable about its central axis.
A rotation driving means for rotating the lower transport die (36) and the inner shielding member (38) integrally around their central axes;
The outer shielding member (64) is integrated with the inner shielding member (38) in a state where the lid top plate portion (41) of the primary molded product (40) is sandwiched between the outer shielding member (38) and the inner shielding member (38). The container lid manufacturing apparatus (20), characterized in that the container lid rotates. In any one of claims 10 to 12,
The transport unit (30)
A support part (31, 32, 33) supporting the lower mold (36) for conveyance;
An elevating rod (37) attached to the upper end in a coaxial state on the inner shielding member (38) and supported in a rotatable state by the support portions (31, 32, 33);
Elevating means (39) for elevating the elevating rod (37) in the direction of the central axis thereof;
Compressed air for molding is supplied to the inner space of the primary molded product (40) mounted on the lower mold for conveyance (36) through a shaft hole (37b) formed in the lifting rod (37). A compressed air supply path,
The partial molding station (70)
An open / close mold (73) that opens and closes in a lateral direction;
A horizontal mold clamping mechanism (74) for opening and closing the open / close mold (73);
An elevating mold clamping mechanism (72) for lowering the open / close mold (73) and clamping the transfer lower mold (36);
A bellows-shaped molding surface formed on the cylindrical portion (47) is formed on the inner peripheral surface of the open / close mold (73),
The primary molded product (40) attached to the lower transfer mold (36) is positioned directly below the open / close mold (73), and the open / close mold (73) is lowered to lower the lower transfer mold ( 36), the cylindrical portion (47) is pushed by pushing the lifting rod (37) upward while supplying compressed air with the open / close die (73) being clamped. An apparatus (20) for manufacturing a container lid, which is formed into the collapsible elastic tubular portion (9). In claim 13,
A through hole (44) is formed in the lid top plate portion (41) of the primary molded product (40),
The partial molding station (70)
A sealing member (75) for sealing the through hole (44) of the primary molded product (40) positioned directly below the opening / closing mold (73) from above;
The said closure member (75) raises with the said inner side shielding member (38), The manufacturing apparatus (20) of the container lid characterized by the above-mentioned.

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