JP5851346B2 - Method for manufacturing a double blow container - Google Patents

Description

The present invention relates to a method for manufacturing a double blow container in which two blow containers are integrated.

  As a double blow container of this type, for example, as shown in Patent Document 1 below, a pair of container bodies formed by blow molding are combined in a state where the side surfaces are aligned with each other, and from the nozzles of each container body Containers that can be used while mixing the discharged contents are known.

Japanese Patent Laid-Open No. 8-198334

  However, in the container described in Patent Document 1, for example, when manufactured by general direct blow molding, a tubular parison is molded by a blow molding die to individually form a container body, and then molded. These two container bodies were combined. Therefore, it cannot be manufactured in a series of flows using one parison, and there is room for improvement in improving manufacturing efficiency.

This invention is made | formed in view of such a situation, The objective is to provide the manufacturing method of the duplex blow container which can be manufactured efficiently at low cost.

In order to achieve the above object, the present invention provides the following means.
(1) A manufacturing method of a double blow container according to the present invention includes a pair of blow containers in which contents are stored and discharge ports for discharging the contents are formed, and these blow containers have a connecting portion. A blow-molded product that is integrally connected to each other and is blow-molded while sandwiching the middle portion of the parison between blow-molding molds. A blow step of forming the connecting portion for axially partitioning the inside of the blow molded product in the axially intermediate portion of the parison and forming the discharge ports at both axial end portions of the parison; A bending step of bending the blow-molded product into two around the connecting portion so as to align the directions of the pair of blow containers.

According to the present invention, at the time of blow molding, a blow molding die is used to form a discharge port and a connecting portion in the blow molded product at the same time, and at the same time, the inside of the blow molded product is axially sandwiched between the connecting portions. Partition. As a result, in the bending process, it is a simple operation that only bends the blow-molded product centering on the connecting portion, and is connected in parallel with each other while being integrally connected to each other via the connecting portion and with the orientation of the discharge ports aligned. It can be a pair of blow containers. Then, a double blow container can be obtained by filling the pair of blow containers with contents through, for example, a discharge port.
In particular, since a double blow container can be manufactured in a series of flows using one parison, the operation is easy and efficient manufacturing can be performed. In addition, since a pair of blow containers can be simultaneously formed with one blow molding die, the molding cost can be suppressed and the production can be performed at a low cost.

(2) In the method for manufacturing a double-type blow container according to the present invention, the connecting portion is hollow so as to communicate one interior of the partitioned blow molded product with the other interior during the blowing step. It is preferable to provide a crushing step of crushing the connecting portion and blocking the communication between the blowing step and the bending step.

In this case, since the connecting portion is formed in a hollow shape, blow molding can be reliably performed only by supplying air from one side of the parison during the blowing process. Therefore, the workability at the time of blow molding can be further improved, the equipment necessary for air supply can be simplified, and the cost can be further reduced.
In addition, since the connecting portion is crushed before the bending step, the blow molded product can be easily bent, and the contents filled in the pair of blow containers are not mixed through the connecting portion.

(3) In the method for manufacturing a double blow container according to the present invention, at the time of the blowing step, one interior and the other interior of the blow molded product partitioned at an axially intermediate portion of the blow molded product It is preferable that a closed filling port that communicates with each other is formed, and after the blowing step, a cutting step of cutting the closed portion of the filling port to open the filling port is provided.

  In this case, since the filling port is formed in the middle portion in the axial direction of the blow molded product, when the blow molded product is folded around the connecting portion, the filling port is located on the opposite side of the discharge port in the axial direction. . Therefore, for example, the contents can be filled from the filling port in a state where the pair of blow containers are stably set up using the discharge port, and the filling workability can be improved.

  According to the present invention, a double blow container can be manufactured efficiently at low cost.

It is a perspective view of the double blow container according to the present invention. It is a process figure at the time of manufacturing the duplex blow container shown in FIG. 1, Comprising: It is a figure which shows the state which enclosed the parison with the metal mold | die for blow molding. FIG. 3 is a half longitudinal sectional view of a blow molded product obtained by blow molding a parison from the state shown in FIG. 2. FIG. 4 is an enlarged view in the vicinity of an intermediate portion in the axial direction of the blow molded product shown in FIG. It is a figure which shows the state which crushed the connection part from the state shown in FIG. It is a perspective view which shows the state which bent the blow molded product into two centering | focusing on the connection part shown in FIG.

Hereinafter, embodiments according to the present invention will be described with reference to the drawings. In each drawing used in the following description, the scale is appropriately changed to make each member a recognizable size.
(Configuration of double blow container)

As shown in FIG. 1, the double-type blow container 1 accommodates contents (not shown) and is formed with discharge ports 17 for discharging the contents, and the discharge ports 17 are aligned in parallel. A pair of blow containers 2 and 3 arranged in a row, and a connecting portion 4 that integrally connects both the blow containers 2 and 3 to each other.
In addition, as said content, a liquid, a gel, a former, cream, etc. may be sufficient, for example, the content regarding foodstuffs may be sufficient, and it is not specifically limited. The pair of blow containers 2 and 3 may be filled with the same type of content, or may be filled with different types of content.

  In the present embodiment, the central axis of each of the blow containers 2 and 3 is referred to as a container axis O, and the vertical direction is defined by the orientation shown in FIG. That is, along the container axis O, the discharge port 17 side is the lower side, and the opposite side is the upper side. A direction perpendicular to the container axis O is a radial direction. Further, a direction in which the blow containers 2 and 3 are arranged in parallel in the radial direction is defined as a first direction L1, and a direction orthogonal to the container axis O and the first direction L1 in the radial direction is defined as a second direction L2.

The pair of blow containers 2 and 3 are resin containers formed by direct blow molding from the same parison 10 (see FIG. 2) by a manufacturing method described later, and are surrounded by a wound body 11 such as a shrink film. So that the parallel state is maintained.
These blow containers 2 and 3 have a body portion 15 formed in an elliptical shape in a cross-sectional view longer in the second direction L2 than in the first direction L1, and a shoulder portion is provided at the lower end opening of the body portion 15 16 is continuously provided, and the discharge port 17 is formed in the shoulder portion 16. The discharge port 17 is arranged coaxially with the container axis O, and the cap 12 is screwed to the discharge port 17.

  A top wall portion 18 is connected to the upper end opening of the body portion 15 to close the opening. The connecting portion 4 is provided on the top wall portion 18 located on the opposite side of the discharge port 17 in the vertical direction. The connecting portion 4 is a member formed by direct blow molding from the same parison 10 as the pair of blow containers 2 and 3 by a manufacturing method to be described later, with respect to the top wall portions 18 of the blow containers 2 and 3. Are integrally connected to each other.

This will be described in detail. The connecting portion 4 is flattened by heat welding (pressure heating) in a crushing step described later, and is formed in a strip shape longer in the first direction L1 than in the second direction L2, and both ends in the extending direction. The portions are connected to the substantially central portion of the top wall portion 18 in the pair of blow containers 2 and 3, respectively.
And a pair of blow containers 2 and 3 are located in a line in the 1st direction L1 by bending centering on this connection part 4. As shown in FIG. At this time, two thin portions 4a that are easily bent are formed in the connecting portion 4 in a line shape along the second direction L2, and are arranged at intervals in the first direction L1.
The pair of blow containers 2 and 3 are arranged on the same axis so that the container axes O coincide with each other in a stage before bending.

By the way, a cylindrical filling port 19 protrudes upward from the top wall portion 18 of the pair of blow containers 2 and 3. The contents are filled into the blow containers 2 and 3 through the filling port 19. The upper ends of these filling ports 19 are sealed by heat welding after filling the contents.
In addition, the filling port 19 formed in one blow container 2 is disposed on one side in the second direction L2 with respect to the connecting portion 4, and the filling port 19 formed in the other blow container 3 is located on the one side in the second direction L2. Arranged on the other side of the two directions L2. Thus, interference between the filling ports 19 is prevented both before and after the pair of blow containers 2 and 3 with the connecting portion 4 as the center.

(Operation of double blow container)
According to the double blow container 1 configured in this way, after the cap 12 is removed, the body portions 15 of the pair of blow containers 2 and 3 are filled through the discharge port 17 by, for example, squeezing deformation. Each content can be discharged, for example, it can be used, mixing these contents.
In addition, it is also possible to discharge only the contents in the blow containers 2 and 3 by removing the caps 12 of any of the blow containers 2 and 3.

(Manufacturing method of double blow container)
Next, a method for manufacturing the above-described double blow container 1 will be described.
First, as shown in FIG. 2, the parison 10 formed and extruded in a tube shape by an extruder (not shown) is surrounded by a blow molding die 20 that can approach and separate from each other. At this time, a cavity C for forming the pair of blow containers 2 and 3 is formed between the cavity surface 21 of the blow molding die 20 and the parison 10.

Further, both blow molding dies 20 each have a pair of sandwiching pieces 22 that are L-shaped in side view and sandwich the intermediate portion in the axial direction of the parison 10. The pair of sandwiching pieces 22 are arranged so as to face each other in the radial direction of the parison 10 with a space therebetween, and a base end piece 22a protruding from the cavity surface 21 toward the radially inner side of the parison 10 and the base piece 22a. A tip piece 22b bent in the axial direction of the parison 10 from the radially inner end of the end piece 22a.
At this time, the distal end piece 22b of one clamping piece 22 is bent so as to protrude upward from the radially inner end of the proximal end piece 22a, and the distal end piece 22b of the other sandwiching piece 22 is bent to the proximal end piece. It is bent so as to protrude downward from the tip of 22a.

  Then, air is supplied to the inside of the parison 10 from one of both end portions in the axial direction of the parison 10 while being welded by sandwiching the middle of the parison 10 in the axial direction between the pair of sandwiching pieces 22 configured as described above. Thereby, as shown in FIG. 3, the parison 10 can be blow-molded corresponding to the cavity C of the blow-molding mold 20, and a blow-molded product 30 can be obtained (blow process).

  In particular, since the blow molding is performed with the pair of sandwiching pieces 22 sandwiching the intermediate portion in the axial direction of the parison 10, the connecting portion 4 that partitions the inside in the axial direction is provided in the intermediate portion in the axial direction of the blow molded product 30. Is formed, and a closed filling port 19 that communicates with one inner R1 and the other inner R2 of the partitioned blow-molded product 30 is formed. In addition, the connecting portion 4 is formed in a hollow shape so that one internal R1 and the other internal R2 of the partitioned blow molded product 30 communicate with each other. In addition, a trunk portion 15, a shoulder portion 16, and a discharge port 17 are formed on opposite sides in the axial direction with the coupling portion 4 interposed therebetween.

That is, the blow molded product 30 in which the pair of blow containers 2 and 3 connected via the connecting portion 4 are coaxially arranged can be obtained by the blow molding described above. And since the connection part 4 is formed in hollow shape, blow molding can be performed only by supply of the air from one side of the parison 10 in blow molding. Further, the supply of the air makes it possible to inflate the closed bag-shaped filling port 19, and the shape of the filling port 19 can be adjusted to a clean cylindrical shape.
A portion sandwiched between the pair of sandwiching pieces 22 and thermally welded becomes a thin piece 31 that can be easily broken and separated.

Next, after the blow molding, the closed portion of the filling port 19 which has been formed into a bag shape is cut along the cutting line M shown in FIG. 3, and the filling port 19 is opened as shown in FIG. Process). Thereby, the filling port 19 will be in the state opened toward the direction opposite to an axial direction, respectively. Moreover, since the mouth shape of the filling port 19 is adjusted as described above, it can be opened in a clean cylindrical shape.
The thin piece 31 can be scraped off while being separated from the blow-molded product 30 along with the cutting of the closed portion of the filling port 19.

  Next, the connecting portion 4 formed in a hollow shape is crushed to perform an operation of blocking communication between one internal R1 and the other internal R2 of the blow molded product 30 (crushing step). Specifically, as shown in FIG. 5, the connecting portion 4 is flattened by heat welding to form a strip shape. At this time, two line-shaped thin portions 4 a are simultaneously formed in the connecting portion 4.

  Next, as shown in FIG. 6, the blow molded product 30 is folded in two around the connecting portion 4 to align the direction of the discharge port 17, and the folded portion is used as a pair of blow containers 2 and 3. (Bending process). In particular, by a simple operation of only bending the blow molded product 30, a pair of elements that are integrally connected to each other via the connecting portion 4 and are aligned in parallel in the first direction L <b> 1 in a state where the directions of the discharge ports 17 are aligned. Blow containers 2 and 3 can be obtained. At this time, the filling port 19 formed in each of the pair of blow containers 2 and 3 is located on the opposite side of the container axis O from the discharge port 17.

  In the present embodiment, the pair of blow containers 2 and 3 are arranged in parallel by bending, and then the blow containers 2 and 3 are integrally wound by the wound body 11 and secured. However, this operation may be performed after the content filling operation described later.

Next, an operation of filling the contents into the pair of blow containers 2 and 3 is performed.
Specifically, after the caps 12 are respectively attached to the discharge ports 17, as shown in FIG. 6, the contents from the filling ports 19 in a state where the pair of blow containers 2 and 3 are stably raised using the caps 12. Fill things. Thereby, the contents can be filled easily and reliably.

  Then, after filling the contents, an operation of sealing (heat sealing) the upper end portion of the filling port 19 by heat welding or the like is performed. Thereby, the double blow container 1 shown in FIG. 1 in which the contents are filled in the pair of blow containers 2 and 3 can be obtained.

According to the manufacturing method described above, since the double blow container 1 can be manufactured in a series of flows using one parison 10, the operation is easy and efficient manufacturing can be performed. Moreover, since a pair of blow containers 2 and 3 can be simultaneously formed with one blow molding die 20, the molding cost can be suppressed and manufacturing can be performed at low cost.
And since the connection part 4 is formed in the hollow shape in the case of blow molding, blow molding can be reliably performed only by supply of the air from one side of the parison 10. Therefore, workability at the time of blow molding can be improved, and facilities necessary for air supply can be simplified. In this respect, it is easy to reduce the cost.

Moreover, since the connection part 4 is crushed before the blow molded product 30 is bent, the blow molded product 30 can be stably folded into two. Moreover, since the two thin line-shaped portions 4a are formed in the connecting portion 4, the thin-walled portions 4a can be bent stably and reliably, and the pair of blow containers 2, 3 can be bent in the first direction L1. Can be neatly arranged in parallel.
Moreover, since the connection part 4 is crushed after blow molding, there is no possibility that the contents filled in the pair of blow containers 2 and 3 are mixed through the connection part 4.

In the case of a tube container using a cylindrically rolled film or a cylindrically extruded sleeve as a body part, a molded product that becomes a mouth part and a shoulder part is attached to the opening end of the body part by bonding or the like. Since it is necessary to fix by retrofitting, the work is complicated and the cost tends to increase. Therefore, according to the double blow container 1 according to the present invention, such a tube container is advantageous in terms of cost and work efficiency.
Furthermore, in the case of the tube container as described above, it is difficult to ensure the barrier property at the connecting portion by retrofitting. However, according to the double blow container 1 according to the present invention, this barrier property is sufficient. Can be secured.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

  For example, in the above embodiment, the connecting portion 4 is formed in a hollow shape at the time of blow molding. However, the present invention is not limited to this, and the connecting portion 4 is crushed by the blow molding die 20 and the internal communication path is blocked in advance. You may form by. In this case, air may be supplied from both sides of the parison 10 and blow-molded. However, by forming the connecting portion 4 in a hollow shape as in the above embodiment, it is possible to perform blow molding simply by supplying air from one side of the parison 10, so that facilities necessary for air supply can be simplified, etc. More preferred.

  Moreover, although the filling port 19 was formed in the said embodiment, this filling port 19 is not essential and does not need to be provided. In this case, for example, the contents may be filled through the discharge port 17. However, by forming the filling port 19, the contents can be filled through the filling port 19 in a state where the pair of blow containers 2 and 3 are erected using the cap 12. Therefore, the filling workability can be improved, which is preferable. In particular, since it is not necessary to use the filling port 19 after filling the contents, the filling port 19 can be sealed by heat welding that can be performed easily and at low cost. Therefore, even if the filling port 19 is provided, low cost can be maintained.

  Furthermore, in the said embodiment, although it was set as the blow containers 2 and 3 which made the top wall part 18 connect with the upper end opening part of the trunk | drum 15, without connecting this top wall part 18, for example, after blow molding, a connection part When crushing 4, a tube-shaped blow container may be used in which the upper end opening of the body portion 15 is sandwiched from the radial direction and the upper end opening is closed by welding the opposing surfaces together.

  Moreover, the parison 10 may be a double-layered blow container in which a pair of blow containers 2 and 3 are formed into a multilayer container by forming a laminated body having a two-layer structure including, for example, an outer layer and an inner layer, and blow molding this. . In this case, the contents can be protected more effectively. In addition, it is not limited to a two-layer structure, It is good also as a multilayer container of three or more layers.

DESCRIPTION OF SYMBOLS 1 ... Duplex type blow container 2, 3 ... Blow container 4 ... Connection part 10 ... Parison 17 ... Discharge port 19 ... Filling port 20 ... Die for blow molding

Claims (3)

A double-type blow container comprising a pair of blow containers in which contents are stored and discharge ports for discharging the contents are formed, and these blow containers are integrally connected via a connecting portion and arranged in parallel A manufacturing method of
The connecting portion for forming the blow molded product by blow molding while sandwiching the axial intermediate portion of the parison with a blow molding die, and dividing the inside of the blow molded product in the axial direction at the axial intermediate portion of the parison And forming a discharge port at both ends of the parison in the axial direction; and
And a folding step of bending the blow molded product into two around the connecting portion so that the directions of the discharge ports are aligned to form the pair of blow containers. Blow container manufacturing method. In the manufacturing method of the double blow type container according to claim 1,
In the blow step, the connecting portion is formed in a hollow shape so as to communicate one inside and the other inside of the partitioned blow molded product,
A method for producing a double blow container, comprising a crushing step of crushing the connecting portion and blocking the communication between the blowing step and the bending step. In the manufacturing method of the double blow container according to claim 1 or 2,
In the blow step, a closed filling port communicating with one inside and the other inside of the partitioned blow molded product is formed in the axially intermediate portion of the blow molded product,
A method for producing a double-type blow container, comprising a cutting step of cutting the closed portion of the filling port and opening the filling port after the blowing step.

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