JP2854354B2 - Container with contact ring and apparatus for manufacturing the same - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a plastic container, and more particularly to a blow-molded container having a ring-shaped projection on an end face of a mouth of the container, and an apparatus for producing the same.

[Conventional technology]

Today, so-called blow-molded plastic containers are used in various fields from the viewpoints of lightness and toughness, and freedom in container design.

In this, for example, as shown in FIG. 6, the rubber container 50 is inserted from the mouth 40a of the blow container 40, and the lower surface 51a of the flange 51 connected to the outer peripheral surface of the mouth of the rubber container 50;
In some cases, the end face of the mouth of the container 40 is brought into contact, and then a valve and a lid (not shown) are incorporated and integrated.

Thus combined container is used as a so-called dispenser, in advance, into a rubber container 50, the fluid to be used to release later, the rubber container 50 is filled with 4 kg / cm ² about pressure It is inflated (the container in the figure shows the state before filling). The fluid filled in the rubber container 50 is constantly subjected to a pressing force due to the contraction force of the expanded rubber container 50, and is discharged and used in a predetermined amount by temporarily opening a valve (not shown) or the like. It has become.

In the use of such a dispenser, when the lower surface 51a of the flange 51 and the contact surface with the end face of the mouth of the container 40 are reliably sealed, and when filling the rubber container 50 with a fluid, Rubber container 50 is the mouth 40a of the blow container 40
It is required that they do not slide inside.

Providing a ring-shaped projection 40p on the end face of the mouth of the container 40 as shown in FIG. 6 in order to meet such a demand is considered to be a preferable means for solving the above problem. .

[Problems to be solved by the invention]

However, the provision of a ring-shaped projection on the end face of the mouth of the container by the conventional blow molding method has not been actually performed yet, and even if molding is attempted by ordinary means, it is difficult to form the container at the time of molding. There is a problem that the gas is not sufficiently vented, a sharp projection is not formed, and it is not practical.

In view of such circumstances, the present invention has been devised, and the present invention solves the above-described problems, and simultaneously forms a container main body by blow molding, and simultaneously forms a ring-shaped protrusion on the mouth end surface of the container. It is another object of the present invention to provide a container having an excellent sealing property at the mouth, and further to provide a blow container manufacturing apparatus capable of forming the container reliably and stably.

[Means for solving the problem]

In order to solve the above problems, the present invention provides a blow molding method in which after the extruded parison is sandwiched and held by a mold, the parison is cut, and a blow pin is inserted into the cut parison and air blow is performed. In the apparatus, a cutting sleeve is fixed to a side surface of the blow pin, and an end surface of the cutting sleeve is provided with a tapered surface extending from inside to outside, and a part of a circumference of the tapered surface has a ring groove. A forming member is incorporated, and a ring-shaped groove is formed by combining one surface of the ring groove forming member and one surface of the end surface of the cutting sleeve.

[Action]

The container of the present invention is a blow-molded container, and has a ring-shaped projection on the upper end surface of the opening of the container.
Therefore, this container is a container having extremely excellent sealing properties at the mouth.

In the device of the present invention, the ring-shaped groove is formed by a combination of the end face of the cutting sleeve and the ring forming member to form a contact ring.

Therefore, gas is sufficiently vented at the time of forming the projection, and the container main body is formed by blow molding, and a sharp ring-shaped projection is formed on the end face of the container mouth. Also, the product yield is good.

〔Example〕

Hereinafter, an embodiment of a blow container (hereinafter, simply referred to as a container with a contact ring) provided with a ring-shaped projection on an end surface of a mouth of the container and an embodiment of a manufacturing apparatus thereof will be described with reference to FIGS. 1 to 6. I do.

As shown in FIG. 2 or FIG. 6, the container with a contact ring 40 of the present invention has a ring-shaped projection 40p on the upper end surface of the opening of the container.
Are integrally formed by blow molding. Then, a combination member (not shown) normally comes into contact with the projection 40p.

Such a container with a contact ring is formed from various plastic materials that can be blow-molded.

Next, an embodiment of the apparatus for manufacturing the container 40 with a contact ring according to the present invention will be described.

The manufacturing apparatus of the present invention comprises an extruding device 70 as shown in FIG. 5, mating dies 21 and 22 for holding and holding the parison 60 extruded by the extruding device 70 and for regulating the outer shape of the container. A cutting device 80 for cutting the parison 60, and a rod-shaped probe 2 (first type) cut and inserted into the parison 60 housed in the mold.
Figure).

However, usually, the pushing device 70 shown in FIG.
Is performed at a different station from the installation position of the blow pin, and a mold transfer device (not shown) is installed during this time. More specifically, there are a so-called blow mold 1, a blow mold 2 (reciprocating left and right alternately), a rotary mold, and the like according to the processing capacity.

The extruder 70 shown in FIG. 5 continuously heats and plasticizes the plastic, and continuously extrudes the parison 60 from the die 71.

The mating dies 21, 22 are appropriately driven by a drive mechanism (not shown).
It can be opened and closed, sandwiches the parison 60, and regulates the shape of the blow container by the cavity shape machined in the mold.

The cutting device 80 generally includes a cutting wire 82 (heated by an insertion heater) stretched on a support 81 and a drive source 83 for reciprocating the cutting wire 82. It is designed to cut parison 60.

By the way, a pair of half ring-shaped cutting plates 23 and 24 are fixed to the upper portions of the dies 21 and 22 so as to form a ring when the dies are closed as shown in FIG. Predetermined tapered portions 23a, 24a are provided inside the cutting plates 23, 24.

Above such a mold, a bar-shaped blow pin 2 which can move up and down to wait for insertion into a parison 60 housed in the mold is on standby (FIG. 1).

The blow pin 2 has a rod-like shape, has a through hole 2b for blowing air at the center in the axial direction, and a rear end thereof communicates with an air source via a not-shown switching valve or the like.

On the other hand, the tip of the blow pin 2 is made one step narrower as shown in the figure, and the cutting sleeve 31 and the ring forming member 35 are fitted on this thinner outer peripheral surface.

Such a cutting sleeve 31 has a cylindrical shape as shown in FIG.
The end face of 31 is provided with a first tapered surface 31a extending from the inside to the outside, and a second tapered surface 31c is further formed from the inside to the outside via the flat surface 31b. Note that the flat surface 31b may not be provided, and the taper surfaces 31a and 31c may be connected to form a taper. As shown in FIGS. 3 and 4, four grooves 39 (only two grooves are shown in the drawing) are provided on the inner peripheral surface of the cutting sleeve 31 in a substantially even manner. Have been. By providing these grooves 39, the gas release effect during molding can be further enhanced.

A ring groove forming member 35 is combined with such a cutting sleeve 31.

The ring groove forming member 35 has a ring shape as shown in FIG. 3, and has a first tapered surface 35a on its outer peripheral surface.
, A second tapered surface 35c is formed. Then, as shown in FIG. 4, the first tapered surface 35a is fitted to the first tapered surface 31a of the cutting sleeve 31, and is formed by the second tapered surface 31C and the second tapered surface 35c ( (Strictly speaking, the flat surface 31b may be included.) A ring-shaped groove E is formed. Usually, each of these members is integrated by being fitted to the blow pin 2.

A cylindrical deflash 5 is rotatably attached to a part of the outer peripheral surface of the cutting sleeve 31 and the blow pin 2.

The leading end of the deflash 5 has an acute angle as shown, while a rotating mechanism (not shown) is provided at the rear end via a connecting member 6.

The driving of the rotation mechanism causes the deflash 5 to rotate forward and backward in the radial direction. Unnecessary deburring of the upper part of the parison is performed by this rotating operation as shown in FIG.

A method for forming a container with a contact ring using the above-described apparatus will be described below.

As shown in FIG.
A heat-plasticized parison 60 is extruded from the extruding device 70 into the insides of 21, 22.

The extruded parison 60 is held by closing the mating dies 21 and 22, and is cut by the cutting device 80.

Then, the mating dies 21 and 22 holding the parison are moved to a station provided with blow pins by a moving device (not shown) (FIG. 1).

In this station, blow pins and the like waiting in advance descend by a drive mechanism (not shown),
A rod-shaped blow pin is inserted into the parison (No. 2
Figure).

At this time, the cylindrical deflash 5 attached to the outer periphery of the blow pin is rotated while the tip 5a is in contact with the cutting plate, and performs deburring. Further, air is blown from the communication hole of the blow pin, and resin is filled into a ring-shaped groove formed by a combination of a cutting sleeve and a ring forming member provided on a side surface of the blow pin (formation of a contact ring). The shape of the container is formed. [Effects of the Invention] The container of the present invention is a blow-molded container, and has a ring-shaped projection on the upper end surface of the opening of the container.
Therefore, this container is a container having extremely excellent sealing properties at the mouth.

In the device of the present invention, a ring-shaped groove is formed by a combination of an end face of the cutting sleeve and a ring-forming member to form a contact ring.

Therefore, the gas is sufficiently vented during the formation of the projections, and the container main body is formed by blow molding, and sharp ring-shaped projections are stably formed on the end face of the container mouth.
Also, the product yield is good.

[Brief description of the drawings]

1 and 2 are longitudinal sectional views for explaining the operation of the main part of the manufacturing apparatus for a container with a contact ring according to the present invention,
3 (a) and 3 (b) are sectional views of the cutting plate and the ring forming member, respectively. FIG. 4 is a sectional view showing a state where the members of FIGS. 3 (a) and (b) are assembled. The figure is a schematic perspective view of a parison extruder, and FIG. 6 is a sectional view showing a container with a contact ring. 2 ... Blow pin, 5 ... Deflash, 21,22 ... Molding die, 23,24 ... Cutting plate, 31 ... Cutting sleeve, 31a ... First tapered surface, 31c ... Second tapered surface, 35 ... Ring groove formation Member, 35a ... first tapered surface, 35c
... Second taper surface, 40 ... Blow container, 40p ... Ring-shaped projection, 50 ... Rubber container, 60 ... Parison, 80 ... Cutting device, E
... Ring-shaped groove.

Continuation of the front page (58) Field surveyed (Int. Cl. ⁶ , DB name) B29C 49/00-49/80 B29C 33/42 B65D 1/02 B29L 22:00

Claims (1)

(57) [Claims] An extruded parison is sandwiched and held by a mold, the parison is cut, a blow pin is inserted into the cut parison, and air is blown. The cutting sleeve is fixed, the end surface of the cutting sleeve is provided with a tapered surface extending from the inside to the outside, and a part of the circumference of the tapered surface is provided with a ring groove forming member. An apparatus for manufacturing a container with a contact ring, wherein a ring-shaped groove is formed by combining one surface of a groove forming member and one surface of an end surface of a cutting sleeve.