JP3115375B2 - Continuous bag making method and apparatus - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a continuous bag making method for continuously forming a bag-like container from an inflation tube and an apparatus therefor.

[0002]

2. Description of the Related Art Conventionally, plastic containers for enclosing various liquid materials, for example, containers for infusion, need to be freely deformable, and are conventionally manufactured by blow molding. However, blow molding is performed in units of one unit using a mold, so that it is expensive in terms of cost, and it is bulky during transportation because it is formed in an expanded state.

Therefore, recently, a method of forming a bag-shaped container from an inflation tube formed continuously in a cylindrical shape has been adopted. The conventional method is to cut the inflation tube to a predetermined length and heat seal the opening portions before and after the inflation tube to form a bag-like container, or heat-seal a predetermined portion and then transfer it with a pair of rotating bodies. In the next step, a bag-shaped container is formed by performing cutting, shaping, drilling, and the like according to the purpose.

[0004]

However, according to the former, it is difficult to automate, so that many parts depend on humans, and the productivity is low, and at the same time, the sealing position and the sealing state tend to vary, and a uniform product is obtained. There is a problem that it cannot be obtained. According to the latter, since the inflation tube is transported by the rotating body, a tensile force acts during the transport, and the softened portion of the inflation tube and its heat seal portion due to heating is elongated, and the cutting position and the punching position in the subsequent process are performed. , The contour shaping goes wrong,
There is a problem that an accurate and uniform product cannot be obtained.

In view of the above, the present invention allows a bag-shaped container to be continuously manufactured from an inflation tube, and does not give any stretch to the inflation tube, and can be used for cutting, perforating, shaping, etc. at an accurate position. An object of the present invention is to provide a continuous bag making method and an apparatus using an inflation tube capable of performing processing.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems of the prior art, the present invention provides a method for moving a predetermined position of a tubular inflation tube during a process of transferring the tube into a continuous shape. In the continuous bag making step of cutting the seal portion and then sequentially shaping the bag-shaped container after heat sealing in the direction, the heat seal portion in the width direction of the tube heat-sealed in a stationary state is kept at the same position in the stationary state. A continuous bag making method using an inflation tube, wherein the tube is moved in a transfer direction over a predetermined distance in a transfer direction while being held in a cooled state while being held in a cooling state, and one side of a transfer path of the inflation tube. A pair of heating seal members provided so as to be able to sandwich the inflation tube, And a heating seal device having driving means for driving the heating seal member in the separating direction, and a heating member supported by a moving body movably provided in the width direction and the transfer direction of the inflation tube to enter between the heating seal members. A pair of cooling holding members for holding the heat sealing portion in the width direction of the inflation tube in a pressure direction, and a cooling device having driving means for driving the holding member in a separating direction are provided. The inflation tube is continuously manufactured by holding the inflation tube at the same position with the cooling holding member at the same position in a stationary state, and moving the moving body to the next process while moving the moving body in the holding state. To provide a bag device.

[0007]

The heat sealing member is clamped by the approaching movement of the heat sealing member to the inflation tube fed between the opposing heat sealing members, and heat sealing is performed in the width direction of the tube. The cooling clamping member enters between the heat sealing members which are separated after the heat sealing, clamps and holds the heat sealing portion, cools the material softened by the heat seal, and softens the material by moving the moving body in the clamped state. Is also transported without stretching.
Therefore, high-precision processing can be performed without causing any inconsistency in post-processing such as cutting, punching, and shaping in the next process after the transfer, and high-quality bag-shaped containers having accurate dimensions can be mass-produced.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings.

FIG. 1 shows a state of a forming process of a bag-like container 1 obtained by the present invention, and FIG. 1 (A) shows a state where a predetermined portion of an inflation tube 2 (hereinafter simply referred to as a tube) is heat-sealed. (B) shows the state after punching, cutting and shaping, and FIG. 1 (C) shows the state after completion.
The bag-like container 1 after completion is heat-sealed at both ends and a port 4 made of a resin cylinder is inserted and welded to one end, and the bag-like container 1 is The holes 5 and 5 are formed at predetermined positions for suspending and using. Although not shown, a scale and a required display are printed on the surface.

FIG. 2 shows a plan view of the overall outline of the production line for the bag-like container 1, FIG. 3 shows the same front view, and FIG. 4 shows the flow of the tube 2 corresponding thereto.

As a whole line, a roll 6 including a dancer roll and wound around the tube 2 is set and the tube 2
A heat-sealing portion 8 for heat-sealing a predetermined position of the tube 2 in the width direction of the tube 2; A cooling unit 9 for transferring the tube 2 to the outer downstream side, a sander roll unit 10 disposed downstream of the moving area of the cooling unit 9, and a bag-like container after the heat seal units 3 and 3 are formed. Punch cutting device 11 that cuts a plurality (three in the figure) as a unit and punches a predetermined position
And a two-row array unit 12 which cuts the unit into two rows and then transfers them to the downstream side, and cuts the tubes 2 and 2 sent in a two-row array into one-unit bag-like shapes and shapes. It comprises a cutting section 13 for shaping and a transport section 14 for transferring the separated pieces to the above-mentioned port 4 insertion and welding step in a horizontal line. Note that the above-mentioned perforation cutting device
Since the configuration after that is not directly related to the present invention, a detailed description thereof will be omitted.

The heat seal portion 8 and the cooling portion 9 according to the present invention show a case where the tube 2 is transported in a horizontal state to make a bag in the illustrated embodiment.

A heat sealing device 15 which is a constituent element of the heat sealing portion 8 is vertically arranged along a vertical frame 17 of a frame 16 having a U-shaped side surface as shown in FIGS. Heated seal members 19 and 19 are supported on the guide rail 18 so as to be movable in a direction in which they are separated from each other. The heating seal members 19, 19 are provided with cantilever-shaped heating body receiving bases 20, 20 whose bases are slidably supported by the guide rails 18, 18, and heat-insulated on opposing surfaces of the heating body receiving bases 20, 20. Heating members 21 and 21 attached via materials 20a and 20a, and heat sealing patterns are formed on the surfaces 21a and 21a of the heating members 21 and 21.

The heat seal members 19 are connected to the air cylinder 2 as a driving means mounted on the frame 16.
2, 22 are connected to each other, and the heat sealing members 19, 19 are driven by driving the air cylinders 22, 22.
Are driven in the direction in which they come and go. In this embodiment, six heat seal devices 16 are arranged in parallel with the heat seal portion 8, and six tubes of the bag-like container 1 are attached to the tube 2 to be transferred.
It is configured to heat seal the individual parts simultaneously.

A cooling device 25 which is a constituent element of the cooling section 9 is provided so as to form a pair with the heat sealing device 15, and as shown in FIGS. 5, 7 and 8, the heat sealing device 15, The base 27 is placed on the rails 26, 26,...
15 is slidably mounted on the base 2
A moving body 28 is mounted on the heating cylinder 7 so as to be movable in the same direction as the rows of the heat sealing devices 15, 15,..., That is, in the same direction as the transfer direction of the tube 2.
The moving body 28 is screwed into a screw shaft 31 having a lower female screw portion 30 supported by the base 27, and the screw shaft 31 is rotated forward and reverse by a motor 32. Thereby, the tube 2 can be moved on the base 27 in the transfer direction of the tube 2.

The moving body 28 has a pair of cooling holding members 33, 33 made of a steel plate having a thickness of about 10 mm, which can be inserted between the heating seal members 19, 19 when they are opened after the sealing is completed. The guide rods 34, 34 fixed to the cooling holding members 33, 33 are slidably inserted through guide holes of the U-shaped frame portions 28a, 28a of the movable body 28 via bushes 35, 35. The rods 37, 37 of the air cylinders 36, 36 as drive means mounted on the frame portions 28a, 28a are connected to the cooling holding members 33, 33, and the holding members 33 are driven by the air cylinders 36, 36. 33, 33 are driven in a direction in which they are separated from each other. If a sufficient cooling effect cannot be obtained depending on the configuration of the cooling holding members 33, 33, cooling water may be passed through the holding members, and the cooling effect may be enhanced by circulating the cooling water. Good. Further, it is desirable that the heat sealing device 15 can adjust the interval between the devices in order to change or finely adjust the sealing interval. As an example, as shown in FIG. 6, the frame 16 of the heat sealing device 15 is movably mounted on a base 24, and a female screw member 38a on the frame 16 side is mounted on a screw shaft 38 which is mounted on the base 24. The frame 16 is moved by screwing the female screw member 38 a through a belt 40 from a motor 39 mounted on the frame 16.

Next, the operation based on the above embodiment will be described.

The tube roll 6 is set in the tube supply section 7, the tube 2 is fed out through the dancer roll, and is passed between the heat seal members 19 of the heat seal devices 15, 15,. 2
The heat sealing members 19, 19 are moved closer to each other by operating them 2, 22, and the tube 2 is sandwiched between the surfaces 21a, 21a of the heating bodies 21, 21 to heat seal. This makes tube 2
Are formed at predetermined positions.

After the heat sealing, the air cylinders 22, 22 are shortened to separate the heat sealing members 19, 19, and then the cooling holding members 33, 3 of the cooling device 25 of the cooling section 9.
The air cylinders 29, 29... Are actuated to move the base 27 forward in the direction of the heat sealing device 15 with a gap of 3, so that the moving body 28 also moves forward and its cooling holding members 33, 33 are moved. The heat seal members 19, 19 enter between the heat seal members 19, 19 (FIG. 8), and the air cylinders 36, 36 act to hold the heat seal portions 3, 3 of the tube 2 interposed between the cooling sandwich members 33, 33. .

Then, when the screw shaft 31 is rotated forward by the motor 32, the cooling devices 25, 25,... Are simultaneously moved downstream from the area of the heating seal portion 8 to the cooling holding members 33, 33.
In the meantime, the tube 2 moves while keeping the heat seal portion of the heat seal portion at the pinching pressure, and stops at a predetermined position where the heat sealed portion moves outside the heat seal portion 8. As a result, a new portion of the tube 2 is located at the heat sealing portion 8 and the heat sealing device 1
Heat sealing is performed in the same manner as described above by 5, 15,. Meanwhile, the cooling holding members 33, 33 of the cooling devices 25, 25 are opened to release the tube 2, and the moving body 28 is retracted by the air cylinders 29, 29, and then the screw shaft 3,
1 is driven in the reverse direction to return to the position facing the heat seal portion 8 again, and takes a state of sandwiching and cooling the heat seal portions 3, 3... Of the tube 2 heat-sealed by the heat seal devices 15, 15,.

By repeating the above-described operation, the tube 2 is heat-sealed at a plurality of locations while being cooled by the holding by the holding members 33 of the cooling device 25.
Tube 2 without stretching the softened part of the heat-sealed part
Can be transferred to the downstream side and can be transferred to the next process.

The tubes 2 coming out of the cooling devices 25, 25,...
Is perforated, then cut into three bags, moved in two rows by the two-row array unit 12, moved and cut into single pieces, completed to be shaped, sent to the transport unit 14, and placed in one horizontal row. Then, it is sent to the insertion welding step of the port 4.

In the embodiment shown in the drawings, the case where the tube 2 is transferred in the horizontal direction to perform the heat sealing and the cooling thereof is instructed. However, the tube 2 is longitudinally fed, and the tube 2 is moved on both sides of the moving path of the tube. The heating seal section 8 and the cooling section 9 may be arranged. Also, the configuration of each part is not limited to the illustrated embodiment, and it is needless to say that the design can be appropriately changed.

[0024]

As described above, according to the present invention, the tube is transferred to the downstream side while holding the heat-sealed portion of the heat-sealing portion with the holding member for cooling of the cooling portion. Even when the tube is heated and softened, the tube can be transferred without expanding and contracting, and the heat seal portion of the transferred tube is cooled, so that the cutting position is not disturbed at the time of cutting after transfer, so that the piercing and In addition, precise and accurate processing can be performed, and thereby, mass production of highly accurate and uniform bag-like containers becomes possible.

[Brief description of the drawings]

1 (A), 1 (B), and 1 (C) are a plan view of a tube and a plan view of a finished product showing one process of bag making according to the present invention.

FIG. 2 is a plan view showing an example of a bag making line to which the present invention is applied.

FIG. 3 is a front view of the same.

FIG. 4 is a state diagram of a tube flowing through a bag making line.

FIG. 5 is a perspective view showing a main part of the present invention.

6 is a perspective view of the heat sealing device in FIG.

FIG. 7 is a perspective view of the cooling device in FIG. 5;

FIG. 8 is a vertical side view of FIG. 5;

FIG. 9 is a side view showing a state at the time of heat sealing.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Bag-shaped container 2 Inflation tube 3 Heat seal part 4 Port 5 Hole 7 Tube supply part 8 Heat seal 9 Cooling part 10 Sander roll part 11 Perforation cutting device 12 Two-row arrangement part 13 Cutting part 14 Transport part 15 Heat seal device 19 Heating Sealing member 21 Heating body 22 Air cylinder 25 Cooling device 28 Moving body 29 Air cylinder 31 Screw shaft 33 Cooling holding member 36 Air cylinder

 ──────────────────────────────────────────────────続 き Continuation of the front page (72) Inventor Satoshi Takane 1-3-2, Miyamaehira, Miyamae-ku, Kawasaki-shi, Kanagawa Prefecture (56) References JP-A-3-14405 (JP, A) Japanese Utility Model Showa 63-39535 (JP, U) JP-A 52-121462 (JP, U) JP-A 41-66 (JP, Y1)

Claims (2)

(57) [Claims] 1. A process for continuously forming a tubular container by heat-sealing a predetermined position of a tube in a width direction during a step of transferring an inflation tube which is continuously formed into a tubular shape, and then cutting the seal portion. in bag-making process, the electrostatic heat seal portion in the width direction of the tube which is <br/> heat sealed at rest
A continuous production process using an inflation tube, characterized in that the tube is moved in the transfer direction over a predetermined distance in the transfer direction while being held in a cooling state while being pressed and held at the same position in the stopped state . Bag way. 2. A process for transferring an inflation tube which is continuously formed into a tubular shape, heat-sealing a predetermined position of the tube in the width direction, and cutting the heat-sealed portion to form a bag-like container in order. In the apparatus, a pair of heating seal members which are provided on one side of a transfer path of an inflation tube and which can be moved in a direction away from and separated from each other so as to clamp the inflation tube; and A heat sealing device having a driving means for driving, and a heat seal portion in the width direction of the inflation tube which enters between the heat sealing members supported by a moving body movably provided in the width direction and the transfer direction of the inflation tube. A cooling device having a pair of cooling holding members for holding the holding pressure and driving means for driving the holding members in a separating direction. Comprising a device, the still form the inflation tube portion which is heat-sealed at rest
A continuous bag-making apparatus using an inflation tube , wherein the holding member is held at the same position in the same state by a cooling holding member, and further transferred to the next step by moving the moving body in the holding state. .