JPH1053225A - Film for packaging accumulation, method and body for packaging accumulation - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a packaging film, packaging method, and packaging body to hold an accumulation comprising a plurality of longer materials in a predetermined form. SOLUTION: The packaging film contains high density polyethylene and low density polyethylene and compounding ratio of high density polyethylene is 15-50wt.%, and shrinkage rate at 120 deg.C is 20% or less and shrinkage rate at 130 deg.C is 40% or more. The packaging film 34 is adhered closely to an accumulation 11 having a predetermined shape so that the accumulation is formed into a rigid body so as to retain its shape and further since unnecessary compressive force is not imparted to the accumulation, the shape of the accumulation 11 can be retained tightly in a stable manner.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a film for holding a plurality of long objects in a state of being accumulated in a predetermined shape, a method of packaging the same, and a package.

[0002]

2. Description of the Related Art When transporting and storing long objects such as various rods and tubular objects, for example, glass tubes, resinous or metal pipes, etc., a plurality of these objects may be bundled together. Done. For example, as shown in FIG. 9, a fixed number of glass tubes 10, 10,... Are bundled to form an aggregate 11, and a tape 12 made of paper or resin is wound around the aggregate 11. Thereby, it is held in a predetermined shape. In this way, by organizing the package into a predetermined shape, the organization, handling, and transportability are improved. In particular, as shown in the illustrated example, if they are stacked in a rectangular parallelepiped shape, the stack of stacked packages can be further stacked, which is convenient.

[0003]

However, if the package of such an aggregate is to be packed, especially if it is a glass tube having a small diameter, it is difficult to keep the aggregate in a predetermined shape. If the tape 12 is made of paper, the strength of the tape 12 is not only weak and easy to break, but also the tightness is poor and the aggregate cannot be kept in a constant shape. Further, in the case of a stretched or heat-shrinkable stretched resin tape, shrinkage stress for compressing the aggregate from outside is constantly applied, so that although the aggregate is tightly bound, the excessive compression There is a possibility that the shape of the aggregate may be collapsed by the stress.
For example, a stack of cuboids as shown in FIG. 9 may be deformed into a columnar shape by the force of the tape to curl, and the stacking state may be lost. Therefore, it is conceivable to use a tape having a small shrinkage stress, a stretchable material, a non-stretched resinous tape having no shrinkage, or fitting a molded product formed in a ring shape in advance to an aggregate. In such a case, the tightness is poor, and it is not easy to always match the external shapes of the molded product and the aggregate.

[0004] The present invention has been made to solve the above-mentioned problems, and provides a packaging film, a packaging method, and a package for holding a plurality of long-sized aggregates in a predetermined shape. .

[0005]

According to the present invention, there is provided a film for packaging an integrated product, comprising a high-density polyethylene and a low-density polyethylene, wherein the compounding amount of the high-density polyethylene is 15 to 50% by weight, The shrinkage at 120 ° C. is 20% or less, and the shrinkage at 130 ° C. is 4%.
0% or more. The packaging method of the present invention, in a state where a plurality of long-sized aggregates are held in a predetermined shape, at least a part thereof contains high-density polyethylene and low-density polyethylene, 15-50% by weight, 120 ° C
After covering a packaging film having a shrinkage factor of 20% or less and a shrinkage factor at 130 ° C. of 40% or more, the film is shrunk by heating. Alternatively, in a state where a plurality of long-sized aggregates are held in a predetermined shape, at least a part thereof contains high-density polyethylene and low-density polyethylene, and the compounding amount of high-density polyethylene is 15 to 50% by weight. ,
The shrinkage at 120 ° C. is not more than 20%, and 13
After coating a film having a shrinkage ratio of 40% or more at 0 ° C. and a shrinkable cloth,
It is characterized by heating to shrink the packaging film. At this time, it is desirable to cover the end of the stack with the packaging film and cover the end face of the stack.

[0006] In the package of the present invention, at least a part of the plurality of long products contains high-density polyethylene and low-density polyethylene, and the compounding amount of high-density polyethylene is 15 to 50% by weight. %, The shrinkage at 120 ° C. is 20% or less, and the shrinkage at 130 ° C. is 4%.
It is characterized by being coated with a packaging film of 0% or more. Alternatively, at least a part of the aggregate formed of a plurality of long objects contains high-density polyethylene and low-density polyethylene, and the compounding amount of the high-density polyethylene is 15 to 50% by weight, and the shrinkage at 120 ° C. is 20%. % And a shrinkage ratio at 130 ° C. of 40% or more, and a shrinkable cloth. At this time, it is desirable that the end portion and the end surface of the stack are covered with the packaging film.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In the packaging of the present invention, high-density polyethylene (HDPE) and low-density polyethylene (LD) are used.
PE) and a resin material containing 15 to 50% by weight of high-density polyethylene,
A material having a shrinkage of 20% or less at 0 ° C and a shrinkage of 40% or more at 130 ° C is used. Since this film shrinks when heated, it is deformed into a shape in which the aggregate is in close contact when heated while covering the aggregate. In addition, when this film is cooled and solidified after heating, it hardly causes a shrinkage action thereafter. Therefore, by covering the aggregate with this film, cooling after heating, the film keeps its shape along the outer shape of the aggregate, lacking the tightness due to loosening, and continuously compressing the aggregate. There is no. Therefore, the film is used to cover, heat, and cool the aggregate held in a predetermined shape, and then, after being solidified, by a film having rigidity with almost no shrinkage stress, the aggregate is in a state where the film is covered. It is maintained in a predetermined shape. Furthermore, this packaging film exhibits such a specific action and also has high strength, particularly high yield strength and breaking strength, and can reliably retain the shape of the aggregate. In addition, the aggregate can be held in various desired shapes such as a triangular prism, a column, and the like in addition to a rectangular parallelepiped.

In the packaging film of the present invention, the amount of the high-density polyethylene is preferably 15 to 50% by weight, more preferably 25 to 35% by weight. If the amount is less than 15% by weight, the strength tends to decrease, and if the amount is more than 50% by weight, the heat sealability decreases, and the heat shrinkage decreases, and the tightness decreases. Also,
The shrinkage at 120 ° C. is preferably 20% or less, more preferably 1 to 12%. Further, the shrinkage at 130 ° C. is preferably 40% or more, more preferably 50 to 75%. If the shrinkage ratio is higher than 20% at 120 ° C. or lower than 40% at 130 ° C., the function of maintaining the shape of the aggregate decreases. In the packaging film of the present invention, the thickness is appropriately set according to the type of the aggregate, the use, and the like, and is not particularly limited. However, if it is too thin, the strength is reduced, and if it is unnecessarily thick, the cost is increased. It is considered appropriate that the thickness is 50 to 200 μm, and about 100 μm is preferable. In addition, since the packaging film of the present invention has transparency, it is possible to identify an aggregate in a packaged state.

In the packaging according to the present invention, the packaging may be covered so as to cover the whole of the aggregate, but a part of the packaging is covered according to the degree of requirement for shielding from the outside. You may do it. Further, when a part of the aggregate is covered, as shown in FIG. 9, it can be coated near the center of the aggregate 11, but as shown in FIG. It is desirable to cover the end portion 42 in the vicinity and also to cover the end surface 40 of the aggregate 11. When the packaging film is heated in such a covered state so as to maintain the shape of the aggregate, the cooled and solidified packaging film is, as shown in FIG. A package having a substantially U-shaped cross section having a side portion 44 corresponding to the end portion 42 and a wall portion 46 corresponding to the end surface 40 of the stack 11, and being solidified and rigid. The strength of the film for use 22 is improved, and the function of maintaining the shape is enhanced. Furthermore, by covering the end face 40 in this manner, contamination of the end face 40 of the accumulation material can be prevented, and when a tubular article is used as a long article, entry of dust and the like into the pipe can be prevented.

[0010] As a packaging film for packaging the aggregate,
As a part thereof, a film composed of the above-mentioned HDPE and LDPE (hereinafter, also referred to as “shape retaining film”)
It is preferable to form a portion made of a different kind of shrinkable cloth. The shrinkable cloth is made by weaving a tape such as linear low-density polyethylene or polypropylene, and plain weave, twill weave, satin weave or the like is applied. When the packaging film is composed of the shape maintaining film and the shrinkable cloth in this manner, the ratio of the shrinkable cloth is 1 to 15 in terms of area ratio.
% Is preferable. If it is larger than 15%,
This is because the proportion occupied by the shape retaining film is reduced, and the effect of retaining the shape of the aggregate without breaking it is reduced. By using such a shape-retaining film and a shrinkable cloth, an integrated package 32 as shown in FIG.
Can be obtained. In the integrated package 32, a packaging film 34 covering both ends of the integrated product 11 is provided.
However, the shape holding film 35 and the shrinkable cloth 36 are joined and integrated. With this integrated package 32, the shrinkable cloth 36 is pulled up from the shape retaining film 35 by pulling up the shrinkable cloth 36 at the time of unpacking in order to take out the long object 10, or Since the shrinkable cloth itself is decomposed along the weaving direction and the packaging film is disassembled, the unpacking operation is facilitated. At this time, as shown in FIG. 3, it is desirable that the width of the shrinkable cloth 36 be wider than the shape retaining film 35 and the knob 38 be formed. If the knob 38 is formed, pulling up the knob 38 makes it easier to peel off the shrinkable cloth.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of a method for packing an aggregate will be described below.
First, as shown in FIG. 4, a predetermined number of long objects 10, 10,... The arm 14 in the illustrated example has a U-shape that is open at the top and sides, and the stack 11 is held in a rectangular parallelepiped shape.
At this time, in order to prevent the shape of the stack 11 from collapsing during the packaging process, it is more desirable to place a lid on the stack 11. Then, the arm 14 holding the stack 11 is made to stand by (to the left in FIG. 1) behind the film supply means 20 in which the rolls 16 and 18 are vertically opposed. In the illustrated film supply means 20, in order to cover the film on both ends of the stack, two rolls 1
6, a total of four rolls of two rolls 18 are arranged below. Each of the rolls 16 and 18 is formed by winding a film made of a mixture of HDPE and LDPE of the present invention, and the film drawn from the paired roll 16 and the film drawn from the roll 18 are joined by an impulse sealer. Have been.

Then, the arm 14 is moved forward, passes between the rolls 16 and 18, and as shown in FIG. 5, the film 22 is pulled out from the rolls 16 and 18 as the stack 11 is moved. Then, the film 22 is put on the stack 11. Further, the transfer of the arm 14 is continued, and FIG.
As shown in the figure, behind the stack 11, the film from the roll 16 and the film from the roll 18 are joined and cut by the impulse sealer 24. Thus,
The front and rear portions and the upper and lower portions of the stack 11 are covered with the film 22. At this time, as shown in FIG.
It is desirable to provide a guide roll 26 so that the coating of No. 2 can be performed smoothly. At this stage, FIG.
As shown in FIG. 8, the tubular film 22 is in a state in which the tubular film 22 protrudes outward from the end face 40 on both sides of the stack 11 and is covered, and as shown in FIG. The portions protruding from both ends of the stack 11 are folded inward and joined to each other, the end face 40 of the stack 11 is closed with the film 22, and an extra portion of the film is cut and removed.

Thereafter, the assembly whose end is covered with the film is heated. Heating is performed by passing through a heating furnace. The heating temperature and time are set according to various conditions such as the size and type of the coated film.
20 to 60 seconds at 0 to 200 ° C is preferred. By this heating step, the film softens and shrinks, and adheres to the stack 11. Thereafter, it is cooled and the film is solidified. The cooling may be forced cooling by various cooling devices, or may be slow cooling by standing cooling. After cooling to room temperature, the stack is taken out from the arm 14 to obtain the stack of packages as shown in FIG.

[0014] In this integrated package, both ends of the integrated package are closely adhered by the solidified resin rigid body.
The aggregate keeps its shape stably. In addition, since this packaging film does not act to loosen or shrink after cooling and solidifying, the shape of the aggregate does not collapse. In the embodiment described above,
By coating the packaging film on the end of the stack and solidifying the film while covering the end face of the stack, the strength is improved and the function of maintaining the shape is enhanced, but the strength is increased. If less is needed, for example, at the center of the stack, the packaging film is formed into a ring,
The packaging process can be simplified or cost can be reduced.

In order to apply a film composed of the above-mentioned shape-retaining film and shrinkable cloth as a packaging film, for example, a shrinkable cloth is used for one roll 16 of the above-mentioned film supply means. In this case, a shape retaining film may be used for the other roll 18.
In this case, it is desirable that the film made of the shape-retaining film occupies most of the film coated on the stack, so that the amount of withdrawal from the roll 16 is reduced and the amount of withdrawal from the roll 18 is increased. It is good to set. Further, in order to make the width of the shrinkable cloth wider than the width of the shape retaining film, the roll 16 of the shrinkable cloth in the film supply means may be made wider than the other roll 18.

Test Examples Using the films made of various resin materials shown in Table 1, a package was manufactured by the above-described method and evaluated. 10mm diameter,
A glass tube having a length of 300 mm and a length of 300 mm in a rectangular parallelepiped shape was used. The width of the film fed from each roll was 500 mm, and both ends of the stack were covered by about 350 mm from the end. Then, heat sealing was performed so as to cover the end face of the stack with a surplus portion of 150 mm. The heat treatment was performed by passing through a 200 ° C. heating furnace for 60 seconds.

[0017]

[Table 1]

Table 2 shows the evaluation results of the shape retention and tightness of each package. In Table 2, the thickness and various physical properties (haze rate, yield strength, breaking strength, yield elongation, breaking elongation, Young's modulus, heat shrinkage) of a part of the film shown in Table 1 were measured. The values are also shown. The heat shrinkage is
The shrinkage was measured when a square sample of 10 cm long × 10 cm wide was immersed in each of glycerin baths at 90 ° C., 100 ° C., 110 ° C., 120 ° C., and 130 ° C. for 20 seconds. The contraction rate (%) was determined by the following equation. Shrinkage = {(Length before immersion)-(Length after immersion)} / (Length before immersion) x 100 The shape retention is based on whether or not the shape of the glass tube is maintained. The evaluation was performed to determine whether the glass tube was sufficiently held by the film even when shaken.
In Table 2, particularly excellent ones are indicated by ◎, good ones are indicated by ○, defective ones are indicated by x, and intermediate ones between の and x are indicated by Δ.

[Table 2]

As apparent from Table 2, HDPE and L
Examples 1 to 5, which are films made of DPE and have a shrinkage ratio at 120 ° C. of 20% or less, have high strength and excellent shape retention and tightness. In particular, the higher the density of HDPE, the better. However, all of the comparative examples have low strength and poor shape retention and tightness. For example,
In the case of Comparative Examples 1 and 2, since the strength is low and the material is easily stretched, it is easy to loosen, and the shape cannot be maintained or the shape cannot be maintained tightly. In the case of Comparative Example 3, since the stretching treatment was performed, although there was some tightness, the force for curling was strong, and the shape of the aggregate was broken.

[0020]

According to the packaging method and the package using the special packaging film of the present invention, the packaging film adheres tightly to an aggregate having a predetermined shape, and becomes a rigid body maintaining the shape. Moreover, since no unnecessary compressive force is applied, the shape of the aggregate is tightly and stably held.
In particular, by covering the end portion of the stack with a packaging film and covering the end surface of the stack, the stack is more firmly held and the stack is packed. In addition, when a shrinkable cloth is formed on a part of the packaging film, the disassembly of the package becomes easier.

[Brief description of the drawings]

FIG. 1 is a front view showing an example of an integrated package.

FIG. 2 is a partial cross-sectional view illustrating an example of an integrated package.

FIG. 3 is a front view showing an example of an integrated package.

4 (a) and 4 (b) show one step of a packaging method according to an embodiment of the present invention, and FIG. 4 (b) is a side view.

FIG. 5 is a side view showing one step of the embodiment of the packaging method.

FIG. 6 is a side view showing one step of the embodiment of the packaging method.

FIG. 7 is a front view showing one step of the embodiment of the packaging method.

FIG. 8 is a front view showing one step of the embodiment of the packaging method.

FIG. 9 is a perspective view showing an integrated package.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Long object 11 Aggregate 22 Film 32 Aggregate package 34 Packaging film 35 Shape retention film 36 Shrinkable cloth 40 End face 42 End

Claims (7)

[Claims] 1. A high-density polyethylene comprising a high-density polyethylene and a low-density polyethylene.
0% by weight, wherein the shrinkage at 120 ° C is 20% or less and the shrinkage at 130 ° C is 40% or more. 2. A high-density polyethylene and a low-density polyethylene are contained in at least a part of an aggregate formed of a plurality of long objects in a state of being held in a predetermined shape. 50% by weight, a shrinkage factor at 120 ° C. of 20% or less, and a shrinkage factor at 130 ° C. of 40% or more are coated, and then heated to shrink the film. How to package things. 3. A high-density polyethylene and a low-density polyethylene are contained in at least a part of a plurality of long-sized aggregates held in a predetermined shape. 50% by weight, a film having a shrinkage ratio of not more than 20% at 120 ° C and a shrinkage ratio of not less than 40% at 130 ° C, and a shrinkable cloth are coated, and then heated for packaging. A method for packaging an aggregate, comprising shrinking a film. 4. The method according to claim 2, wherein the packaging film covers an end of the stack and covers an end face of the stack. 5. At least a part of an aggregate consisting of a plurality of long objects contains high-density polyethylene and low-density polyethylene, the blending amount of high-density polyethylene is 15 to 50% by weight, and shrinkage at 120 ° C. Is 20% or less and a shrinkage factor at 130 ° C. of 40% or more is covered with a packaging film. 6. At least a part of a plurality of long-sized aggregates contains high-density polyethylene and low-density polyethylene, and the compounding amount of high-density polyethylene is 15 to 50% by weight, shrinkage at 120 ° C. The rate is 20% or less and 1
A film having a shrinkage of 30% or more at 30 ° C .;
An integrated package covered with a packaging film comprising a shrinkable cloth. 7. An end portion and an end surface of the stack are covered with a film for packaging.
A package according to the above.