JP2799668B2 - How to insert a container into a film bag - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of opening an opening of a film bag and inserting the container into the container when shrink-wrapping the container with the film bag.

[0002]

2. Description of the Related Art As is well known, shrink wrapping is achieved by heat shrinking a container with a film bag.
It is to be packed. The shrink wrapping includes a bag manufacturing process for manufacturing a film bag from a tubular film sheet, a container inserting process for inserting a container to be packed into the manufactured film bag, and a process for inserting the container. A step of heating the film bag to bring the film bag into close contact with the entire surface of the container to obtain a bag.

In such a shrink wrap, the present invention relates to a container inserting step. There are also various shapes for containers to be inserted. In the present invention, the containers to be inserted particularly extend in the longitudinal direction, and one end of the container has a substantially circular shape, and the other end has this shape. It is intended to have a flat shape having a major axis longer than the diameter of the circle and a minor axis shorter than the diameter of the circle. Here, one end having a substantially circular shape is abbreviated as a circular end, and the other end having a flat shape is abbreviated as a flat end. Also,
A container having such a shape will be referred to as a tubular container.

FIG. 6 shows a tubular container and a conventional method of inserting the same into a film bag. In FIG.
(A) is a front view showing only a tubular container,
(B) is a plan view showing the relationship between the tubular container and the film bag into which it is inserted, and (c) is the right side showing the relationship between the tubular container and the film bag into which it is inserted. FIG.

As shown in FIGS. 6 (a) to 6 (c), a tubular container 10 extends in a longitudinal direction and has a circular end 1 having a radius R.
1, the long axis length and short axis length and a flat end 12 of each L _l and L _s. Here, the radius R, the major axis length L _l and minor axis length L _s is a relationship of _{L l>} 2R> L _s. In such a tubular container 10, the circular end 11 has an outer circumference of 2πR and the flat end 12 has an outer circumference equal to about 2 (L _l + L _s ).

In order to package such a tubular container 10, a film bag product 20 'conventionally used is
As shown in FIG. 6 (c), the outer periphery is viewed from the insertion direction of the tubular container 10, that is, the outer periphery when the tubular container 10 is viewed from the circular end 11 or the flat end 12 (hereinafter, referred to as “the outer periphery”). (Referred to as projection circumference). In other words, the outer circumference of the film bag product 20 'is determined to be slightly longer than the projected outer circumference. Note that this projected outer circumference is longer than the outer circumference 2πR of the circular end 11 and the outer circumference 2 (L ₁ + L _s ) of the flat end 12 and also the longest outer circumference of the tubular container 10 (hereinafter, the longest outer circumference). Note that this is much longer than

The film bag product 20 'has an opening 21' open at one end and the other end is closed. Conventionally, the tubular container 10 has been inserted into the film bag product 20 'as described below.

That is, as shown in FIGS. 6 (b) and 6 (c), the opening 21 'of the film bag product 20' is formed in such a size that the tubular container 10 can be completely stored using the guide 30 '. To expand. In this state, the tubular container 10 is inserted into the film bag product 20 'by moving the tubular container 10 in the direction shown by the arrow in FIG. This minimizes the contact between the tubular container 10 and the film bag product 20 '. During this insertion operation, a guide 30 for opening the opening 21 'is provided.
'Is fixed and its position does not move.

[0009]

As described above, in the conventional container insertion process, if the shape of the container to be inserted changes in the insertion direction as shown in FIG. 6, it is inevitable. In addition, it is necessary to use a film bag product 20 'whose peripheral length is longer than the outer peripheral length of the container (the longest outer peripheral length).

In general, the smaller the difference between the longest outer circumference of the container and the circumference of the film bag product, the better the finished product after shrinking in the bag product heating step. This is because printing displacement and deformation of the film surface of the film bag product are reduced. However, as mentioned above,
In the conventional container insertion step, the conventional film bag product 20 'is used.
Has to be determined on the basis of the projected outer circumference, and there is a disadvantage that the finished product after shrinking is not so good.

Accordingly, it is an object of the present invention to provide a method for inserting a container into a film bag product which can improve the finished product after shrinking.

Another object of the present invention is to provide a method for inserting a container into a film bag, which can be inserted in a state where the difference between the longest outer peripheral length of the container and the peripheral length of the film bag is small. is there.

Still another object of the present invention is to provide a method of inserting a container into a film bag, which can accommodate a container whose shape changes in the insertion direction.

[0014]

According to the present invention, an opening of a film bag is held by a guide from the inside and opened.
In the method of inserting a container from the opening, the opening of the film bag product, to the extent that the insertion end of the container can enter, while holding using a pair of opposing guides, Opening and intersecting with the pair of guides
Using a pair of flexible spring plates facing each other
Holding the opening from the inside by using
And an opening filled with the pair of flexible spring plate members.
The container is inserted into the opening in the
The container is brought into contact with a flexible spring plate material to
While increasing the distance between the flexible spring plate members,
A method of inserting a container into a film bag product including a step of inserting while reducing the distance between the guides .

According to the above insertion method, the peripheral length of the film bag product can be determined based on the longest peripheral length of the container.

The above-described insertion method can be applied to a case where the shape of the container changes in the insertion direction.

As an example of such a container, it extends in the longitudinal direction, one end of which is substantially circular, and the other end has a major axis longer than the diameter of the circle and a minor axis length of the circle. There is a flat tubular container shorter than the diameter. In the case of this tubular container, it is desirable that the flattened end be the insertion end.

[0018]

Embodiments of the present invention will be described below with reference to the drawings.

Referring to FIG. 1, FIG. 2 and FIG. 3, a packaging machine for realizing the method for inserting a container into a film bag according to the present invention comprises a packaging machine body 41 and a packaging machine body 41. And a fixed air operated actuator 42. The air-actuated actuator 42 includes a pair of reciprocating plates 43A and 43 opposing each other with the air-actuated actuator 42 interposed therebetween.
3B is reciprocated in the left and right direction in FIG. A pair of holders 44A and 44B are fixed to the pair of reciprocating plates 43A and 43B by bolts, respectively.

At the lower ends of the pair of holders 44A and 44B, a pair of guides 45A and 45B are provided to face each other.

The guide 45A is provided with respect to the holder 44A.
In FIG. 1, a rod portion 45Aa slidably held in the left-right direction, a rotation preventing member 45Ab for preventing the rod portion 45Aa from rotating around its axis, and a guide 45B on the other side of the rod portion 45Aa. And a bag-making holding portion 45Ac that is fixed to the end on the opposite side and holds the opening 21 of the film-made bag product 20.

Similarly, the guide 45B has a rod portion 45Ba held slidably in the left-right direction in FIG. 1 with respect to the holder 44B, and prevents the rod portion 45Ba from rotating about its axis. Rotation prevention member 45B
b, and is fixed to the end of the rod portion 45Ba on the side facing the other guide 45A, and the opening 2 of the film bag product 20 is fixed.
1 and a bag-making holding portion 45Bc for holding the bag holder 1.

Here, FIG. 1 shows an air-actuated actuator 4.
2 shows a state in which the holders 44A and 44B are opened, and at this time, the bag making holding portions 45Ac and 45Bc
Is at the position shown by the solid line in FIG. When the holders 44A and 44B are closed by the air-actuated actuator 42, the bag-making holding portions 45Ac and 45Bc are at the positions indicated by the broken lines in FIG.

As shown in FIG. 2, the opening 21 of the film bag product 20 is provided with the bag holding portions 45Ac and 4Ac.
5Bc. In FIG. 2, the film bag product 20 extends to the right. Therefore, in FIG. 1, the film bag product 20 extends in the upper direction of the paper surface, and has a pair of bag manufacturing holding portions 45Ac and 45Bc.
Also protrude upward in the plane of the paper.

As shown in FIGS. 2 and 3, a tubular container 10 to be inserted into a film bag product 20 is provided.
Moves from the right side to the left side and is inserted into the film bag product 20. Therefore, in FIG.
Moves from the bottom to the top of the page.

The pair of guides 45A and 45B are urged away from each other by a pair of springs 46A and 46B, respectively. These pair of springs 46A
And 46B are respectively applied to the rod portions 45Aa
And 45Ba are adjusted by adjusting nuts 47A and 47B provided at mutually separated ends.

The upper spring plate 48A and the lower spring plate 48B facing each other in a direction intersecting the direction in which the pair of guides 45A and 45B face each other are connected to the packaging machine main body 41.
Is fixed to the fixed side with bolts or the like. The pair of spring plates 48A and 48B are made of a flexible thin plate. As will be apparent from the following description, the pair of spring plate members 48A and 48B are used to insert the tubular container 10 into the film bag product 20 while the tube container 10 is being inserted into the film bag product 20.
This is for preventing 0 from coming off from the pair of guides 45A and 45B.

As shown in FIG. 1, a pair of spring plate members 4
8A and 48B extend from the fixed end in a direction approaching each other, and further have their tips (movable ends) bent upward in the plane of the paper of FIG.

FIG. 2 is a right side view as viewed in the X direction of FIG.
5A and 45B bag-making holders 45Ac and 45Bc
2 shows a state before the tubular container 10 is inserted into the film bag product 20.

FIG. 3 is a right side sectional view as seen from the Y direction in FIG. 1 and shows a state where the tubular container 10 is being inserted into the film bag product 20.

FIG. 4 is a plan sectional view seen from the Z direction in FIG. 3, and shows a bag-making holding portion 45Ac and 45Bc of the pair of guides 45A and 45B in the process of inserting the tubular container 10 into the film-made bag product 20. The behavior of is shown.

FIG. 5 is a view showing the bag making and holding in accordance with the change of the container cross section in the insertion direction in the process of inserting the tubular container 10 as seen from the directions A, B, C, D, E and F in FIG. The behavior of the portions 45Ac and 45Bc and the pair of spring plates 48A and 48B is shown.

Hereinafter, a method for inserting a container into a film bag according to the present invention will be described with reference to FIGS. Here, the perimeter of the film bag product 20 used in the present invention is determined based on the longest perimeter of the container to be inserted. That is, the difference between the perimeter of the film bag product 20 and the longest perimeter of the container to be inserted is determined to be as small as possible. Further, the case of the tubular container 10 described with reference to FIG. 6 will be described as a container to be inserted.

First, the holders 44A and 44B are closed by the air-actuated actuator 42. Therefore, the bag-making holding portions 45Ac and 45Bc of the pair of guides 45A and 45B are at the positions indicated by broken lines in FIG. .

In this state, the film bag product 20 is opened by the bag manufacturing product expanding and conveying device (not shown) so that the opening 21 has the bag manufacturing holding portions 45Ac and 45Bc of the pair of guides 45A and 45B and the pair of springs. It is supplied to a position that covers the ends of the plate members 48A and 48B. still,
For the construction of the bag making product expanding and conveying device, see, for example, Japanese Patent Application No. 3-206451.

Thereafter, the holders 44A and 44B are opened by the opening operation of the air-actuated actuator 42, thereby opening the opening 21 of the film bag product 20 with a pair of guides 45A and a pair of guides 45A as shown in FIG. 4
5B is held in the bag-making holding portions 45Ac and 45Bc.
The holding force at this time is given by the urging force of the pair of springs 46A and 46B. At this time, film bag product 2
The 0 opening 21 is opened to the extent that the insertion end of the tubular container 10 can enter.

In this state, as shown in FIGS. 2 and 3,
With the flat end 12 of the tubular container 10 as the insertion end, the tubular container 10 is moved leftward on the paper surface by an inserter (not shown) to insert the tubular container 10 into the film bag product 20.

In this inserting step, as shown in FIGS. 4 and 5, as the tubular container 10 is inserted into the film bag product 20, the distance between the pair of guides 45A and 45B is changed from L ₁ → L. It changes so that it becomes narrow like ₂ → L ₃ . Therefore, the bag-making holding portions 45Ac and 45Bc of the pair of guides 45A and 45B move along the outer shape of the tubular container 10.

In this insertion step, the contact surface pressure between the tubular container 10 and the film bag product 20 is as shown in FIG.
As shown in FIG. 5, the contact surface pressure gradually increases as f ₁ <f ₂ <f _3, and the contact surface pressure acts to pull out the opening 21 of the film bag product 20 from the bag manufacturing holding portions 45Ac and 45Bc. In the present embodiment, in order to prevent the detachment, a pair of spring plate members 48A and 48B are arranged between the opening 21 of the film bag product 20 and the tubular container 10.
Thus, the contact surface pressure f _1, f _2, f ₃ by can reduce the extraction force to the film bag products 20. Therefore, the tubular container 10 can be normally inserted into the film bag product 20.

As described above, in the present embodiment, the bag-making holding portions 45Ac and 45Bc for holding the opening 21 of the film bag product 20 are made smaller in size than the conventional one, and the pair of guides 45A and 45A are inserted during insertion of the container. 45B is movable. Further, during insertion of the container, the pulling force acting on the film bag product 20 is reduced by disposing the pair of spring plates 48A and 48B. As a result, as compared with the conventional film bag product 20 'shown in FIG.
Can be greatly reduced (shortened). As a result, the amount of packaging material used can be reduced, and the economic effect is very large.

Further, in this embodiment, the difference between the longest outer peripheral length of the container and the peripheral length of the film bag product can be made as small as possible, so that there is an advantage that the finished product after shrinking can be improved.

In the insertion method according to the present invention, as in the case of the tubular container 10, one end thereof is substantially circular, and the other end has a long axis and a circle longer than the diameter of the circle. There is a great advantage when a flat container having a short axis shorter than the diameter of the film is inserted into a film bag, but the container to be inserted is not limited to such a shape. It goes without saying that there is also an advantage when inserting a container whose shape changes in the insertion direction.

[0043]

As described above, according to the present invention,
When the opening of the film bag is opened and the container is inserted into the opening, a pair of guides facing each other is used so that the insertion end of the container can enter the opening of the film bag. And open the container, and insert the pair of guides along the outer shape of the container into the film bag, so that the size of the film bag with respect to the container size is larger than before. Can be smaller. As a result, there is an effect that the amount of the packaging material used can be reduced. Also,
Since the difference between the longest outer peripheral length of the container and the peripheral length of the film bag product can be made as small as possible, there is an advantage that the finished product after shrinking can be improved.

[Brief description of the drawings]

FIG. 1 is a front view showing a packaging machine for realizing a method for inserting a container into a film bag product according to the present invention.

FIG. 2 is a right side view as viewed in the X direction of FIG. 1, wherein an opening of the film bag is attached to a bag holding portion of a pair of guides, and a tubular container is inserted into the film bag. It is a figure showing the state before performing.

FIG. 3 is a right side sectional view seen from a Y direction in FIG.
It is a figure which shows the state in which the tubular container is being inserted in a film bag product.

FIG. 4 is a plan sectional view seen from the Z direction in FIG. 3, showing a behavior of a bag-making holding portion of a pair of guides during a process of inserting a tubular container into a film-made bag.

5 shows a bag-making holding portion and a pair of a bag-making holding portion according to a change in the insertion direction of the container cross section in the process of inserting the tubular container viewed from the directions A, B, C, D, E, and F in FIG. It is a figure showing behavior of a spring board material.

FIG. 6 is a view for explaining a conventional method for inserting a container into a film bag product.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Container 11 Circular end 12 Flat end 20 Film bag product 21 Opening 41 Packaging machine main body 42 Air operation actuator 43A, 43B Operation plate 44A, 44B Holder 45A, 45B Guide 46A, 46B Spring 47A, 47B Adjustment nut 48A, 48B Spring Board

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) B65B 5/04 B65B 35/16 B65B 53/00

Claims (5)

(57) [Claims] 1. An opening of a film bag product is inserted from inside with a guide.
In the method of holding and opening the container, and inserting the container from the opening, the opening of the film bag product, a pair of opposed to each other, to the extent that the insertion end of the container can enter. A step of opening while holding using a guide, and a pair of opposing ones crossing the pair of guides.
Holds the opening from the inside using the flexible spring plate material
A step of, open at the said pair of guides and said spring plate member of the pair of flexible
Insert the container into the opening in the opened film bag
Contact the container with the pair of flexible spring plate members.
When the distance between the pair of flexible spring plate members is increased by
And inserting the container while reducing the distance between the pair of guides . 2. A method of inserting a container into the claim 1, wherein the film bag products circumference of the film bag article is determined based on the longest circumferential length of the container. 3. The method according to claim 2 , wherein the shape of the container changes in the insertion direction. 4. The container extends in a longitudinal direction, one end of which is substantially circular, and the other end of which has a long axis longer than the radius of the circle and a short axis shorter than the radius of the circle. 4. The method for inserting a container into a film bag according to claim 3, wherein the container is a flat tubular container. 5. The method according to claim 4 , wherein the flat end of the tubular container is the insertion end.