JP2949376B2 - Equipment for manufacturing sealed plastic containers with contents - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates to a method for molding a heated cylindrical parison of a thermoplastic resin extruded downward by a plastic extruder into a container under heat and filling the container with the contents. The present invention also relates to an apparatus for producing a sealed plastic container containing contents for closing a container.

[0002]

2. Description of the Related Art Such an apparatus for producing a sealed plastic container containing contents is disclosed in JP-B-33-8078, JP-B-36-5985, JP-B-43-24557, and JP-B-48-30671. It is known.

In each of the above conventional apparatuses, air is blown into a cylindrical parison of a thermoplastic resin which is extruded downward by a plastic extruder between a pair of mold dies for molding a container body. Then, the cylindrical parison is formed into a container having an open upper end. Then, the contents are filled into the container. Then, the open upper end of the container is opened with a pair of split molds for the top for forming the container top. The part is closed under the heat of a cylindrical parison, and then the split mold is opened to drop the container onto a conveyor or the like.

[0004]

In the above-mentioned conventional apparatus, the split mold is opened, and the container is dropped freely between the pair of split molds. In this case, since the pair of split molds has a molded portion at the bottom of the container at the lower end, even when the split mold is opened, the container may remain in one of the split molds and may not drop smoothly. When the container is filled with liquid, the soft upper portion of the container is deformed by falling obliquely, and in the case of a container filled with powder, the soft upper portion and the body of the container are deformed. In addition, in order to automatically take out the container between the opened split molds with a magic hand etc., it is necessary to separate the container from the pair of split molds and hold it vertically even after the split mold is opened. is there.

[0005]

SUMMARY OF THE INVENTION Accordingly, the present invention provides a method for holding a part of a container body inside a pair of split dies by holding the opposite holding dies so that the holding dies are opened even if the split dies are opened. By holding the container with, the container is separated from the pair of split molds, preventing the container from remaining in either split mold and enabling removal with a magic hand, etc. The container was opened to allow the container to drop vertically, and a part of the pair of body part split dies was provided with opposed through portions, and each of the through portions was opened and closed with the opening and closing direction of the split mold. Opposing holding dies that open and close in the same direction are fitted to each other, and each holding die is opened and closed by a cylinder independently of the split die.

[0006]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the illustrated embodiment, reference numerals 1, 1 'denote a pair of openable and closable body split dies for forming a container body, 2, 2' a holding mold, and 3, 3 ' Fig. 3 shows a pair of openable and closable top split dies which are opposed to each other on the body split die and form a container top.

In this embodiment, the holding dies 2, 2 'are equal in width to the body split dies 1, 1'. In order to provide the molds 1 and 1 ', the split mold for the body is divided into upper molds 1a and 1a' and lower molds 1b and 1b '.
The upper molds 1a, 1a 'and the lower mold 1 are fixed to opposing mold support plates 5, 5' while being separated upward from the lower molds 1b, 1b '.
The holding dies 2, 2 'which open and close in the same direction as the opening and closing directions of the body split dies 1, 1' are fitted into the through portions 4, 4 'formed between b and 1b'.

[0008] The mold supporting plates 5, 5 'are split molds 3, 3 for the top.
, And has an extension projecting upwardly therethrough, to which opposed parison holders 6, 6 'are fixed. The parison holder is a suction box connected to a vacuum pump by a hose, and an intake hole is opened in the opposing semicircular wall.

In this embodiment, since a cylindrical container is formed, the upper and lower cavities of the split mold for the body have a semicircular cross section in cross section, and the lower dies 1b and 1b 'close the dies. And a bottom forming part for forming the bottom of the container by contacting the bottom. The opposing surfaces of the holding dies 2, 2 'are also semicircular, but their curvatures are slightly smaller than the curvatures of the arcs at the lower end of the upper mold cavity and the upper end of the lower mold cavity. The split molds 3 and 3 'for the top have cavities on the opposing surfaces in which the upper half of the sphere is vertically bisected. As a result, the split molds 1 and 1 'for the trunk and the split molds 3 and 3' for the top (the above three molds are collectively referred to as molds) are closed as described later. The container B formed by molding has a bottom as shown in FIG. 3, has a cylindrical body, has an annular constriction formed by holding dies 2, 2 'in the middle, and has a dome-shaped upper end of the body. Bottle with a top wall of

On the mold supporting plates 5, 5 ', piston-type cylinders C ₂ , C ₂ ' for opening and closing the holding molds 2, ₂ 'are provided.
Piston type cylinders C ₃ and C 3 ′ for opening and closing the top split molds 3 and ₃ ′ are mounted on the back surface.

Reference numeral 7 denotes a mold support base for supporting the opposing mold support plates 5 and 5 'so as to be openable and closable. The left and right sides are slidably passed through the front ends of the posts 8, 8 projecting long from the mold support, and the left and right sides of the other mold support plate 5 'are fixed to the front ends of the posts.

The rear ends of the posts 8, 8 are connected to connecting beams 9 respectively.
In connected, the connecting beam 9, the back of the slidable mold support plate 5 with respect to the post, which is linked with a piston-type cylinder C ₁ for opening and closing the mold.

On the mold support plate 5, racks 10, 1 projecting toward the rear end of the posts in parallel with the posts 8, 8 are provided.
0 is mounted on the back, and the racks
10 and rack teeth 11 facing the mold support base 7.
, A pinion 12 meshing with each of the racks 10 and the rack teeth 11 is pivotally mounted.

Two guide rods 13, 13 orthogonal to the posts 8, 8 are slidably penetrated through the mold support 7. Both ends of the guide rods 13 are fixed on a bed 14 with brackets 15 and one of the brackets 1
5 and the mold support base 7 is connected with the cylinder C ₄ of the piston type. Thus, although the mold support base 7 is the movable along the guide rods 13 and 13 in the expansion and contraction of the cylinder C _4, it does not move in the direction of the post 8, 8 which is perpendicular thereto.

[0015] The when extending the piston rod of the cylinder C _1, the mold support plate 5 is pushed towards the other mold support plate 5 ', but advanced, simultaneously, the connection beams 9 in the reaction force Post 8,8 , And the mold support plate 5 ′ attempts to approach the mold support plate 5 by the retraction of the post. The pinion 12 pivotally attached to the mold support is engaged with the rack 10 attached to the advancing mold support plate 5 and the rack teeth 11 formed on the retreating post 8, and rotates in one direction. 5 and the retracting amount of the mold support plate 5 'integrated with the post are synchronized, and are advanced and retracted by the same amount to each other, and the split molds 1, 1'.
And the parison holders 6, 6 'close soon. To open the closed split mold and Parisonhoruda, it Re retract the piston rod of the cylinder C _1.

[0016] 16 the extrusion nozzle of the extruder for extruding a tubular parison 17 downward, 18 is elevating molding, filling nozzle, the mold support base 7 along guide rod 13 on the bed 14 by the cylinder C ₄ And the supporting dies 1, 1 ', 2, 2', 3, 3 '
6 and a molding / filling position directly below the molding / filling nozzle 18.

The nozzle 18 for forming and filling has a blow tube 19 at the center, a filling tube 20 outside the tube, and an outer sleeve 21 outside the blow tube 19. These are arranged concentrically, and the outer periphery of the filling tube 20 and the outer sleeve 21 are arranged. Exhaust line 22 communicating with the atmosphere during the inner circumference of
Are formed.

To manufacture a liquid-containing plastic container,
The mold support base 7 is moved in the cylinder C _4, align the mold extrusion position. At this time, the dies 1, 1 ', 2, 2', 3,
3 'and the parison holders 6, 6' are left open (FIG. 6).

[0019] From then extrusion nozzle 16, a lower end mold 1,1 'extruded downwardly tubular parison 17 so as to be positioned below the mold support plate 5,5 in the cylinder C ₁ After extrusion' above upper mold 1a of advanced and retracted by the barrel for split mold as, 1a 'and the lower die 1b, 1b', and 'closes the cylinder C _2, C _2' parison holder 6,6 holding dies 2 , 2 ′ are closed, and then the suction boxes of the parison holders 6, 6 ′ are connected to a vacuum source, and compressed air is blown into the interior of the cylindrical parison from a blowing port 16 ′ at the center of the extrusion nozzle 16. As a result, the lower end of the cylindrical parison is sandwiched and closed by the bottom wall forming portions of the closed lower molds 1b, 1b ', so that the cylindrical parison 17 slightly expands, and the upper ends thereof are closed parison holders 6, 6'. The openings are held by being attracted to the inner surfaces facing each other. Therefore, the cylindrical parison is cut by the cutter 23 at a position slightly above the parison holders 6, 6 '. This cutter 23
It is provided below the extrusion nozzle 16.

[0020] Then moving the mold support base 7 in the cylinder C _4, forming a mold, is positioned just below the filling nozzle 18 (FIG. 7), inserted from the top into the interior of the tubular parison to drop the nozzle . Then, as shown in FIG. 8, the lower end of the outer sleeve 21 of the nozzle 18 is connected to the upper mold 1a via a cylindrical parison.
1a ', when it comes into contact with the upper end portion of the cavity, the lowering of the outer sleeve is stopped, and compressed air is blown out of the blow tube 19 while integrally lowering the blow tube 19 and the filling tube 20, thereby forming a closed body for molding. A cylindrical parison is blow-molded in the bottle-shaped container along the cavity by the inner surfaces of the upper dies 1a, 1a ', the lower dies 1b, 1b' and the holding dies 2, 2 '.

When the lower end of the blow tube 19 and the filling tube 20 reaches near the bottom of the container, the blowing of the compressed air from the blow tube is stopped, and at the same time, the exhaust air between the tube 20 and the outer sleeve 21 is formed. The exhaust line is opened to the atmosphere by opening the valve 24 leading to the line 22, and then, for example, a liquid is injected into the vessel from the filling tube 20 as shown in FIG. To be discharged. Then, both tubes 19 and 20 are pulled up while being synchronized with the rise of the liquid level in the vessel (FIG. 10).

When the container is filled with a predetermined amount of liquid,
The injection of the liquid from the filling tube 20 is stopped, and the two tubes 19 and 20 are further stopped.
When the outer sleeve 21 and the tubes 19 and 20 that have stopped descending are restored to their original state, the valve 24 is closed and the forming and filling nozzle 18 is raised (FIGS. 11 and 1).
2). Then the cylinder C _3, C ₃ to close the 'top for split mold 3,3 in', the tubular parison, the upper die 1a, the portions of the 1a 'the upper portion of the container by forming the top wall of the dome-shaped Close.

[0023] The parison holder 6 of one, on the burr cutter 25 advancing and retracting in the cylinder C ₅ mounted on the mold support plate 5 is provided between the top portion for split mold 3. The cutter 25 is hollow, and compressed air is supplied to the inside thereof so that the cutter 25 blows out from the cutting edge at the front end. On the lower surface of the other parison holder 6 ', there is provided a receiving portion 26 which faces the cutter 25 and receives the upper burr on the top splitting mold 3, 3' of the cylindrical parison cut by the cutter. is there.

An upper burr projecting rod 27 is slidably inserted into the accommodating portion 26 in the same direction as the opening and closing direction of the mold. The rod 27 extends loosely through the mold supporting plate 5 ', and a connecting rod 28 extends from the tip thereof. Goes down. The 'cylinder C ₂ for opening and closing the' holding dies 2 is a double-acting type piston rod projects from both ends of the cylinder, one piston rod is loosely the mold support plate 5 'as described above The other end of the piston rod is connected to the lower end of the connecting rod 28.

As described above, when the top molds 3, 3 'are closed and the upper end of the container is closed in a dome shape, the upper burr cutter is opened before the molds 3, 3' are opened as shown in FIG. 2
5 is advanced and the split mold for the top of the cylindrical parison is 3 and 3 '.
At the same time as cutting the upper burr 29, the suction of the parison holders 6 and 6 ′, which had previously adsorbed the upper ends of the cylindrical parisons facing each other, was stopped, and the cut upper burr 29 was accommodated by the upper burr cutter 25. Push into part 26. When the upper burr cutter 25 moves forward to cut the upper burr, compressed air is blown from the cutting edge to the upper burr to cool down the temperature of the upper burr and make it easier to cut.

The upper burr cutter Once pushed do in the housing portion 26 by cutting the upper burr Thus, pull back over the burr cutter in a cylinder C _5, mold support plate 5 in the cylinder C ₁ at the same time,
5 and 'the barrel for breaking gold 1,1 away from each other', parison holder 6, 6 'is opened and the cylinder C _3, C _3'
To open the top split molds 3 and 3 ', but hold the molds 2 and 2'.
Cylinders C ₂ and C ₂ ′ are left as they are (FIG. 1). Thus, mold support plate 5, 5 'cylinder C _2,
C ₂ is held in a vertical position between the split mold 1,1 vessels opened by 'retreated along the piston rod, remaining holding dies 2,2 not open''and3,3' .

Further, as the mold is opened by the mold supporting plates 5 and 5 ', the accommodating portion 26 of the upper burr also retreats along the protruding rod 27, so that the leading end is pulled into the through hole of the accommodating portion 26 until then. The upper burr protruding rod 27 protrudes forward from the accommodating portion 26, and protrudes the upper burr 29 pushed into the accommodating portion 26 to drop.

The holding dies 2, 2 'are split molds 1 for the body.
1 ', the holding mold 2,
Due to 2 ', a constricted portion is formed in the middle of the body of the container, and the holding molds 2, 2' hold the constricted portion, so that the liquid-filled container is not accidentally dropped.

[0029] Thus the mold 1,1 ', 3,3' is greater than the diameter of the container, after opening halfway, then holding dies 2,2 'also cylinder C _2, C _2' opens at. As a result, the liquid-filled container falls onto the lower conveyor together with the upper burr without touching the bottom wall forming portions of the lower dies 1b and 1b 'of the body split mold. The dies 1, 1 ', 3, 3' are first opened and then the holding dies 2, 2 'are opened. When taking out the container with a magic hand or the like, the mold 1, 1 ',
When 3, 3 'is opened, a magic hand is inserted between them, the container is gripped by the magic hand above or below the holding molds 2, 2', and then the holding molds 2, 2 'are opened.

When the holding dies 2, 2 'are opened, the dies are then advanced by moving the mold support plates 5, 5' together and the split dies 1, 2 'are opened.
It is in a position to hold the container again when 1 'is closed.

When the container falls or the container is removed with a magic hand, the mold is left open, and the mold support ₄ is moved by the cylinder C4 to move the mold immediately below the extrusion nozzle of the extruder. Position, extrude the cylindrical parison downward from the extruder, and repeat the above operation to produce the next container with liquid.

In the illustrated embodiment, the width of the holding dies 2, 2 'is made equal to the width of the body-forming split dies 1, 1'. 1a, 1a 'and the lower molds 1b, 1b', and the upper molds 1a, 1a 'are fixed to the mold support plates 5, 5' while being separated from the lower molds 1b, 1b '. The through-holes 4 and 4 'for fitting the holding dies 2 and 2' are provided between the dies and the dies. Good. In this case, the body-forming split mold is not divided into an upper mold and a lower mold, and a window-shaped through portion is provided in the body-forming split molds 1 and 1 ', and the holding mold 2 and the holding mold 2 are provided in the through portions. 2 'may be fitted.

In the illustrated embodiment, the molded container is
Although it is a substantially cylindrical bottle, a polygonal or elliptical bottle can be formed by changing the cross-sectional shape of the cavity of the mold.

Further, in this embodiment, a liquid, for example, milk is injected into the container with a filling nozzle to produce a sealed plastic container containing liquid. However, the container is filled with a powder, for example, powdered milk, from the filling nozzle. Enclosed sealed plastic containers can also be manufactured.

[0035]

As is apparent from the above description, in the present invention, the holding molds 2 and 2 'are kept closed and the body split molds 1 and 2' are closed.
1 'and the top split molds 3, 3' are opened. For this reason,
The sealed container, containing the contents, is held in holding molds 2, 2 ', separated from the cavities of the open molds 1, 1' and 3, 3 ', in a vertical position between the open spaces of the molds. Keep.

Accordingly, the magic hand is inserted between the opened molds, the container is grasped with the magic hand above or below the holding molds 2, 2 ', and the holding molds can be opened and taken out. When opened, the container can be dropped vertically without contacting the split molds 1 and 1 'for the trunk.

[Brief description of the drawings]

FIG. 1 is an explanatory view of a state in which a split mold is opened while a holding mold is closed.

FIG. 2 is a perspective view of a half of a split mold and a holding mold.

FIG. 3 is a perspective view of the manufactured sealed container with contents.

FIG. 4 is a perspective view of a mold opening / closing device and a moving device.

FIG. 5 is a plan view of FIG. 4;

FIG. 6 is an explanatory view of a state in which a cylindrical parison is extruded, a split mold for a trunk, and a holding mold are closed.

FIG. 7 is an explanatory view of a state in which a mold is moved below a molding and filling nozzle.

FIG. 8 is an explanatory view during blow molding of a cylindrical parison into a container.

FIG. 9 is an explanatory diagram of an initial stage when filling of a container with contents is started.

FIG. 10 is an explanatory view of a state in which the filling and filling nozzle is pulled up while filling the contents in the container.

FIG. 11 is an explanatory diagram of a state where filling of contents is completed.

FIG. 12 is an explanatory view showing a state in which a top split mold is closed and an upper end of a container is closed.

FIG. 13 is an explanatory diagram of a state in which an upper burr is being cut.

[Explanation of symbols]

1, 1 'Split mold for trunk 2, 2' Holding mold 3, 3 'Split mold for top part 4, 4' Penetration part 5, 5 'Mold support plate 6, 6' Parison holder 7 Mold support stand 8 Post 9 Connecting beam 10 Rack 11 Rack teeth 12 Pinion 13 Guide rod 14 Bed 15 Bracket 16 Extrusion nozzle 17 Cylindrical parison 18 Molding filling nozzle 19 Blow tube 20 Filling tube 21 Outer sleeve 22 Exhaust line 23 Cutter 24 Valve 25 Upper burr cutter 26 Upper burr accommodating portion 27 Upper burr protruding rod 28 Connecting rod 29 Upper burr C ₁ Opening / closing cylinder C ₂ , C ₂ ′ of body mold splitting mold Opening / closing cylinder C ₃ , C ₃ ′ Top holding split mold mold opening and closing cylinder C ₄ type support base of the transfer cylinder C ₅ above Barikatta actuating cylinder

Continuation of the front page (72) Watanabe Watanabe, Inventor 2-20-25 Motota, Urawa-shi, Saitama (56) References Hikaru 2-16707 (JP, U) (58) Field surveyed (Int. Cl. ⁶⁾ B65B 9/00-9/24 B65B 47/00-47/10

Claims (2)

(57) [Claims] 1. A pair of openable and closable body split dies for forming a container body, and a pair of openable and closable tops opposed to each other on the body split mold to form a container top. For the split mold, a plastic extruder that extrudes a tubular parison of a thermoplastic resin downward between the pair of split molds, and a blow tube that blows air into the cylindrical parison to form a container,
A hermetically sealed plastic container having a filling tube for filling the contents into the container, forming the cylindrical parison into a container under the heat of the container, filling the contents into the container, and closing the container; In the manufacturing apparatus, opposed facing dies are provided in a part of the pair of body part split dies, and opposed opening dies are opened and closed in the opening and closing directions of the split dies in the respective through portions. Wherein each holding mold is opened and closed by a cylinder independently of the split mold. 2. The apparatus for manufacturing a sealed plastic container with contents according to claim 1, wherein when the body split mold and the holding mold are respectively closed, the holding mold is a body split mold. An apparatus for producing a sealed plastic container with contents, wherein the apparatus is adapted to enter and contact a cavity.