JPH0423632Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Technical Field] The present invention relates to a packaging sheet used for packaging rolled steel plates and the like.

[Technical background and conventional technology]

When transporting or storing steel plates in packaging, first roll the steel plate manufactured by a process such as rolling, wrap it in a packaging sheet, and then wrap it in packaging material such as a metal plate. Packed by.

A wrapping sheet made of kraft paper is used to wrap the rolled steel material. However, when the sheet is made of kraft paper alone, the sheet has low strength and may break at the edges of the packaged item.

Therefore, recently, a resin film (laminated material) such as polyethylene or biaxially oriented polypropylene is laminated to a base material such as kraft paper, and a reinforcing material is further interposed between the base material and the resin film. is being developed. FIG. 6 shows a conventional packaging sheet of this type in a plan view. This packaging sheet is made by laminating a base material 1 such as kraft paper and a resin film 2 such as a polyethylene film or a biaxially oriented polypropylene film, and a reinforcing material 3 such as nylon thread or vinylon thread is inserted between the two. It is interposed by knitting it in the shape of a mesh. By interposing the reinforcing material 3 in a diamond pattern in this manner, the strength of the packaging sheet is increased, and packaging defects such as breakage can be prevented.

[Problems with conventional technology]

In the conventional packaging sheet as shown in Fig. 6,
As an adhesive between the base material 1 and the resin film 2, an adhesive polymer such as polypropylene is used. However, this adhesive polymer has the drawback of being sensitive to oil and heat. Generally, in the case of a rolled steel plate or the like wound into a roll, a large amount of rust preventive oil is generally applied around the rolled steel plate. Since the packaging sheet is wrapped over the rust preventive oil, the rust preventive oil easily passes through the base material 1 or the resin film 2 and adheres to the adhesive portion after packaging. the result,
The adhesive polymer is swollen and dissolved by the rust preventive oil, and the resin film 2 is transferred to the base material 1 within a few days after packaging.
The phenomenon of peeling occurs frequently. Furthermore, conventional packaging sheets have the disadvantage that the adhesive layer tends to peel off even in high-temperature environments.

Furthermore, the conventional packaging sheet manufacturing method is
An adhesive polymer heated to about 200° C. and melted is applied to the surface of the base material 1 using a roll or the like, and then the base material 1, the resin film 2, and the reinforcing material 3 are bonded together. However, applying the melted adhesive polymer using a roll is inefficient, and
However, there is a drawback that the feeding speed of the resin film 2 cannot be made very high. This slows down the manufacturing speed of packaging sheets, putting a limit on mass production.

[Purpose of invention]

The present invention was developed by focusing on the above-mentioned conventional problems, and it is possible to bond a base material, a laminating material such as a resin film, and a reinforcing material with high strength, making it difficult for breakage to occur. It is an object of the present invention to provide a packaging sheet that can be manufactured at a faster manufacturing speed than conventional ones and that can improve mass productivity.

[Summary of the idea]

The packaging sheet according to the present invention has a linear or band-shaped reinforcing material interposed between the base material and the laminate material in a woven state, and an adhesive between the base material and the laminate material. Polyethylene or polypropylene is interposed as a resin, and the base material and the bonding material are bonded together under pressure.

The packaging sheet of the present invention is produced by applying pressure between a base material, a laminated material such as a resin film, and a reinforcing material woven in a rhombic pattern. Since the adhesive resin is melted and supplied using a so-called laminate adhesive, a strong adhesive layer can be formed. Therefore, a high-strength adhesive layer is formed, making it difficult for the adhesive layer to peel off due to oil or heat, thereby preventing packaging defects when packaging steel materials or the like.

[Example of idea]

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

First, the structure of the packaging sheet according to the present invention will be explained with reference to FIGS. 1 to 5.

1 and 2 (a sectional view of FIG. 1) show a first embodiment of a packaging sheet S according to the present invention.

Reference numeral 1 is a base material. This base material 1 is kraft paper or the like. A bonding material 2 is adhered to the surface of this base material 1. The laminating material 2 may be a resin film such as a polyethylene film or a biaxially stretched polypropylene film, an aluminum film or a metal film, a polyethylene cloth, a polypropylene cloth, another hemlock cloth, or even the same craft paper as the base material 1. used.

In addition, a reinforcing material 3 is provided between the base material 1 and the laminated material 2.
is interposed. The reinforcing material 3 is made of a soft material such as a thread such as nylon or vinylon, or a band made of these materials. Further, if necessary, the reinforcing material 3 may be formed of a wire rod or band-shaped body made of metal such as steel or aluminum.

The reinforcing material 3 is interposed between the base material 1 and the bonding material 2, and is pressed and bonded by pressure rolls 11 and 12 in the laminating section A of the manufacturing apparatus shown in FIGS. As the adhesive resin P at this time, polyethylene or polypropylene is used. This adhesive resin P is supplied to a T-shaped die 3 provided in an adhesive resin supply section E in the manufacturing apparatus shown in FIG.
1, it is heated to about 300° C., extruded into a thin film, and supplied between the base material 1 and the bonding material 2. Then, they are bonded under pressure using pressure rolls 11 and 12 to form the state shown in FIG. 2.

Further, the plurality of reinforcing materials 3 are supplied by the reinforcing material supply section D in the manufacturing apparatus shown in FIG.
As shown in FIG. 11, it is supplied between the base material 1 and the bonding material 2 while being rotated in an elongated cylindrical shape by the supply band 26f of the rotating supply member 26. Then, a plurality of reinforcing materials 3 stretched into a cylindrical shape are held between the base material 1 and the bonding material 2 in a crushed state. As a result, as shown in Figure 1, the reinforcing material 3 is knitted with high density at both edges in the width direction of the base material 1 (left and right edges in the figure), and is knitted in a diamond pattern in the center. becomes.

Since the strength of this packaging sheet S is increased by the reinforcing material 3, it becomes difficult to break.
For example, even if a cut is made from both edges of the packaging sheet S, it is possible to prevent the cut from progressing. In addition, since the base material 1 and the laminated material 2 are laminated and bonded using adhesive resin P made of polyethylene or polypropylene, the adhesive strength is high, and the rust-preventing oil applied to the packaged items does not adhere to the product or the environment. Even if the temperature rises, the adhesive layer will not peel off.

FIG. 3 shows a second embodiment of the packaging sheet S. In this embodiment, the reinforcing material sandwiched between the base material 1 and the bonding material 2 is a soft material 3 such as nylon or vinylon thread knitted in a diamond pattern, and a metal wire or metal strip. Both of the anti-curl materials 3a having such rigidity are used. Soft material 3
As in the embodiment shown in FIG. 1, the reinforcing material supply section D (see FIG. 7) is used to form a rhombic pattern. Further, a plurality of curl prevention materials 3a are inserted at intervals in the width direction of the base material 1. This curl prevention material 3a is combined with the soft material 3 on the base material 1 and the laminated material 2.
By sandwiching the packaging sheet between them, the rigidity of the entire packaging sheet is increased and at the same time curling in the longitudinal direction is prevented. Furthermore, when an object to be packed is wrapped with the wrapping sheet S, the rigid anti-curl material 3a is plastically deformed so that the wrapping sheet S is adapted to the shape of the object to be packed. Therefore, it is possible to prevent the packaging from shifting or collapsing.

This anti-curl material 3a is supplied from the anti-curl material insertion swing section G in the manufacturing apparatus shown in FIG. At this time, the curl-preventing material 3a can be slightly corrugated as shown by α in FIG. 3 by operating the swinging supply member 42 shown in FIG. Anti-curl material 3a like this α
By undulating the curling prevention material 3a, when the completed packaging sheet S is rolled up into a roll,
This prevents deviations due to overlapping in the radial direction of the windings, making it possible to wind the rolls in a good roll state.

4 and 5 (a sectional view of FIG. 4) show a third embodiment of the packaging sheet S. In this embodiment, the same material as shown in FIG. 1 is used, and a tape 4 is adhered to the back surface of the base material 1. This tape 4 is made of kraft paper, cloth, synthetic resin, or a thin metal plate. In the case of the embodiment shown in FIG. 1, warpage tends to occur not only in the longitudinal direction but also in the width direction after lamination due to the difference in the degree of shrinkage between the base material 1 and the laminated material 2. By pasting the tape 4 on the back surface of the base material 1 as in the third embodiment, the warping in multiple directions can be prevented.

Next, the manufacturing apparatus and manufacturing process for the packaging sheet S will be explained with reference to FIGS. 7 to 11.

In FIG. 7, A is a laminating section, B is a base material supply section, C is a laminating material supply section, D is a reinforcing material supply section, E is an adhesive resin supply section, F is a packaging sheet winding section, and a second G shown in the figure is a curl prevention material insertion swinging section.

Laminating part A is a pair of pressure rolls 11 and 12
It also includes a back-up roll 13 that is in pressure contact with one of the pinch rolls 12.
The large-diameter pressure roll 11 is rotationally driven by a motor, and this pressure roll 11 also has a function as a cooling roll.

The base material supply section B is for supplying the base material 1. The base material 1 is held by the holding member 16 while being wound into a roll 1a. The holding member 16 is rotatably supported on the pedestal 15, and by rotating the holding member 16, the roll 1a can be replaced. The base material 1 is supplied to the laminating section A while being guided by a plurality of supply rolls _r1 .

The laminating material supply section C is for supplying the laminating material 2. The bonding material 2 is held by the holding member 18 in the form of a roll 2a. The holding member 18 is rotatably supported on a pedestal 19, and the roll 2a can be replaced by rotating the holding member 18. The laminated material 2 is supplied to the laminating section A while being guided by a plurality of supply rolls _r2 .

The reinforcing material supply section D is for supplying a large number of reinforcing materials 3, knitting them in a diamond pattern, and supplying the reinforcing materials 3 between the base material 1 and the bonding material 2 in the laminating section A. FIG. 8 is a plan view showing this reinforcing material supply section D, FIG. 9 is a side view showing the reinforcing material supply section D in an enlarged manner, and FIG. 10 is a right side view of FIG. 9.

Reference numeral 21 is a rotary supply member. The reinforcing material 3 is held in the form of a roll 3a by the supply member 21. In FIG. 10, the rolls 3a are shown arranged in vertical and horizontal rows, but in reality, the rolls 3a are arranged in virtual circles O ₁ , O ₂ , O ₃ ,
A large number of them are held concentrically along O ₄ ....
The supply member 21 is rotatably supported by a horizontal axis on the pedestal 22, and
It is adapted to be rotationally driven by a motor M provided on 2. Further, the power of the motor M is transmitted forward by the drive shaft 23, and the auxiliary rotating member 2
4 to rotate. Further, the power of the drive shaft 23 is transmitted forward through a universal joint 25, and a rotation supply member 26 is driven. In other words, the supply member 21 holding the roll 3a, the auxiliary rotation member 24, and the rotation supply member 26 are rotated at the same number of rotations. As shown in FIG. 10, the auxiliary rotating member 24 is composed of a chain-like rotating band 24a stretched in a thin diamond shape, and the reinforcing material 3 extending from all the rolls 3a is supported by this rotating band 24a. will be done. Further, as schematically shown in FIG. 11, the structure of the rotation supply member 26 includes a drive wheel 26a connected to the drive shaft 23, and an auxiliary drive wheel 26c connected to the drive wheel 26a by a belt or chain 26b. , a driven wheel 26d rotating together with the auxiliary drive wheel 26c, another driven wheel 26e disposed at a constant interval from this driven wheel 26d, and a supply belt 26f stretched between each driven wheel 26d and 26e. It is composed of members. Each of these members is supported by a support member 26g. In addition, driven wheels 26d and 26e
are arranged at substantially the same intervals as the width of the base material 1. The supply zone 26c is chain-shaped,
As shown in FIG. 11, all of the reinforcing material 3 held by the supply member 21 is supported by this supply band 26c, and further supplied between the pressure rolls 11 and 12.

The adhesive resin supply section E is constituted by a T-shaped die 31. This T-shaped die 31 heats an adhesive resin P of polyethylene or polypropylene to about 300°C and forms a thin film between the pressure rolls 11 and 12.
It is intended to be supplied in the middle.

The packaging sheet winding section F is for winding up the packaging sheet S manufactured by the laminating section A. This packaging sheet winding section F is composed of a sheet roll Sa, a winding roll 35, and a pedestal 36 supporting the sheet roll Sa.
The take-up roll 35 is driven by a motor to rotate the sheet roll Sa.
Further, the sheet roll Sa is a wrapping sheet S wrapped around the packaging sheet S.

The curl prevention material insertion swinging part G shown in FIG.
As in the embodiment shown in FIG. 3, this is used when supplying an anti-curl material 3a for preventing the wrapping sheet S from curling in the longitudinal direction. This curl-preventing material insertion swinging section G is composed of a roll 41 that supplies the curl-preventing material 3a, and a swinging supply member 42 that feeds the curl-preventing material 3a stretched from the roll to the laminating section A. The anti-curl material 3a supplied from the swinging supply member 42 is supplied between the base material 1 and the bonding material 2 at the laminating section A. The anti-curl material 3a is supplied while being swung by the swinging supply member 42, and is supplied between the base material 1 and the bonding material 2 while being slightly undulating.

Next, the manufacturing process of a packaging sheet using the above-mentioned manufacturing apparatus will be explained.

A base material 1 such as kraft paper is pulled out from the roll 1a of the base material supply section B, guided by the supply roll _r1 , and passed between the pressure rolls 11 and 1 of the lamination section A.
2. A laminating material 2 such as a polyethylene film or a biaxially oriented polypropylene film is pulled out from the roll 2a and transferred to the pressure roll ₁₁ of the laminate section A by the supply roll r2.
and 12.

Further, in the reinforcing material supply section D, reinforcing material 3 such as nylon thread or vinylon thread is pulled out from a large number of rolls 3 a held by the supply member 21 and stretched from the auxiliary rotation member 24 to the rotation supply member 26 . Furthermore, the reinforcing material 3 extended from the supply band 26f of the rotating supply member 26 is supplied between the base material 1 and the bonding material 2 at the laminating section A. Since one pressure roll 11 is rotationally driven by a motor, the base material 1, the laminated material 2, and the reinforcing material 3 sandwiched between this pressure roll 11 and the other pressure roll 12 are successively compressed. and then sent out. At this time, the supply member 21, the auxiliary rotation member 24, and the rotation supply member 26 of the reinforcing material 3 are rotationally driven at the same rotational speed. As shown in FIG. 11, when the drive wheel 26a of the rotational supply member 26 is rotationally driven, the supply band 26f located below the drive shaft 23 moves in the direction A, and the supply band 26f located above The band 26f will move in the direction B. As a result, the reinforcing material 3 below the drive shaft 23 moves in the A direction, and the reinforcing material 3 above the drive shaft 23 moves in the B direction, and a large number of reinforcing materials 3 move with the feeding direction of the base material 1 as their axis. It is elongated in the form of a cylindrical body with an elliptical cross section. Then, the reinforcing material 3 in this cylindrical shape is compressed and supplied between the base material 1 and the bonding material 2 within the pressure rolls 11 and 12. When the rotation of the rotating supply member 26 and the rotation of the pressure roll 11 are performed continuously, the reinforcing material 3 is in a diamond-like woven state as shown in FIGS. 1, 3, and 4. It comes to be sandwiched between the base material 1 and the bonding material 2.

Along with the above operation, polyethylene or polypropylene adhesive resin P is heated to about 300°C and extruded into a thin film from the T-shaped die 31 of the adhesive resin supply section E, and is then extruded into the base material 1 and the laminated material 2 in the laminate section A. and the reinforcing material 3 knitted in a lozenge pattern. Then, the base material 1, the bonding material 2, and the diamond-shaped reinforcing member 3, which are pressed by the pressing rolls 11 and 12, are fused to each other by the adhesive resin P, and the adhesive resin P is By being cooled by the pressure roll 11, each member is firmly bonded.

In addition, when manufacturing the packaging sheet S shown in FIG. 3a is supplied between the base material 1 and the bonding material 2 while waving it. This anti-curl material 3a is then laminated with adhesive resin P. Note that it is of course possible to insert the anti-curl material 3a in parallel, as shown in FIG. 3, without waving the material 3a.

In addition, when manufacturing the packaging sheet according to the third embodiment shown in FIGS. 4 and 5, an adhesive mechanism for the tape 4 is provided in a position parallel to the laminate part A in FIG. 7, and the laminated packaging sheet is A tape 4 is continuously adhered to the back surface of the base material 1 of the sheet S. or,
Tape 4 using anti-curl material insertion swinging part G
Of course, it is also possible to supply It is also possible to insert the tape 4 between the base material 1 and the bonding material 2.

[Effect of idea]

As described above, according to the present invention, the following effects can be achieved.

(1) Since the base material, laminated material, and reinforcing material are firmly fixed by pressure adhesion using polyethylene or polypropylene, even if the packaged item is a steel plate, it can be prevented. This makes it difficult for the adhesive layer to peel off due to rust oil. Furthermore, the adhesive layer will not peel off due to heat.
As a result, a packaging sheet with good durability can be constructed.

(2) As stated in claim 2,
If the reinforcing material is formed into a cylindrical shape, then crushed and knitted in a diamond pattern, and interposed between the base material and the laminated material, there will be no breaks or discontinuities in the reinforcing material in the width direction of the base material. This makes it possible to construct packaging sheets with high strength. Furthermore, since there is no discontinuous part of the reinforcing material, even if the edge of the sheet breaks, the progress of the break line is blocked by the reinforcing material, making it possible to form a packaging sheet that is difficult to break. It becomes like this.

(3) As stated in claim 3,
If an anti-curl material is used, the anti-curl material will be plastically deformed when wrapping an object to be packed, so that the wrapping sheet will conform to the shape of the object to be packed. It also has a synergistic effect of preventing warping after lamination.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing a packaging sheet according to a first embodiment of the present invention, FIG. 2 is a sectional view thereof, FIG. 3 is a plan view of a packaging sheet according to a second embodiment of the present invention, and FIG. 5 is a plan view showing a packaging sheet according to a third embodiment of the present invention, FIG. 5 is a sectional view thereof, FIG. 6 is a plan view showing a conventional packaging sheet, and FIG. 7 is a plan view showing a packaging sheet according to the present invention. 8 is a plan view showing a part of the manufacturing device; FIG. 9 is a partial enlarged view of FIG. 1st
0 is a right side view of FIG. 9, and FIG. 11 is an explanatory diagram of the operation of the manufacturing apparatus showing a state in which the reinforcing material is knitted in a diamond pattern. S... Packaging sheet, 1... Base material, 2... Lamination material, 3... Reinforcement material (soft material), 3a... Curl prevention material, 4... Tape, P... Adhesive resin, A
...Laminating section of packaging sheet manufacturing equipment, B
... Base material supply section, C ... Lamination material supply section, D ...
Reinforcement material supply section, E... Adhesive resin supply section, F...
Packaging sheet winding section, G... Curling prevention material insertion swinging section, 11, 12... Pressure roll, 21...
Reinforcing material supply unit, 26...Rotary supply member, 31
...T-shaped die that supplies adhesive resin.

Claims (1)

[Scope of claims for utility model registration] (1) A linear or band-shaped reinforcing material is interposed between the base material and the laminate material in a woven state, and A packaging sheet consisting of a base material and a laminate material that are bonded together under pressure, with polyethylene or polypropylene interposed as an adhesive resin in between. (2) The reinforcing material is inserted between the base material and the laminated material in a cylindrical shape that is pulled out diagonally and crushed into a lozenge-like pattern. The packaging sheet described in item 1. (3) The reinforcing material is composed of a soft material knitted in a rhombus pattern and a rigid anti-curl material arranged in parallel along the longitudinal direction of the base material as described in Claim 1 of the Utility Model Registration Claim. packaging sheet. (4) The packaging sheet according to claim 3, wherein the anti-curl material is interposed in a wavy manner in the longitudinal direction of the base material.