JPH02269671A - Laminated packaging material - Google Patents

Abstract

PURPOSE:To permit as many packaged objects as needed to the taken out at low costs and with ease by arranging heat sensitive layers so as to make contacts with the upper and lower parts of the object. CONSTITUTION:The subject packaging material consists of a pair of laminated sheets, each composed of a heat resisting layer 3 and a heat sensitive adhesive layer laminated together directly or with the other layer interposed therebetween. These sheets are so arranged as to bring the heat sensitive layers 4 and 7 into contact with the upper and lower surface of a plurality of objects to be packaged arranged in the same plane. This permits the objects such as plastic container, etc. to be automatically packaged with the minimum necessary amount of the packaging material, thereby permitting limited natural resources to be effectively used and the amount of the waste to be reduced.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to a plurality of plastic products or cans, bottles,
This invention relates to a collective packaging material for collectively bundling and packaging containers such as paper containers.

[Prior Art] Various methods have been used for packaging plastic products, cans, bottles, paper containers, etc., such as shrink packaging, wrapping packaging, stretch packaging, and paper carton packaging.

However, these packaging methods had various drawbacks as shown below.

That is, in shrink packaging, not only is a heating furnace required to shrink the packaging film, but also the packaged contents are heated. Furthermore, when taking out the packaged items, the entire packaging film must be torn off, and a large amount of packaging film is used per unit package, resulting in high costs and a large amount of waste. There was a problem.

Furthermore, wrapping packaging and stretch packaging have problems in that not only is it troublesome to take out the packaged items, but also a large amount of packaging material is required, resulting in a large amount of waste.

Furthermore, packaging using paper cartons not only has a relatively high cost, but also has the problem that the paper cartons are not easily resistant to water and tear when wet, rendering them useless as packaging materials.

[Problems to be Solved by the Invention] As described above, in conventional packaging methods for cans, bottles, etc., not only is it time-consuming to attach and store the packaging, but also it is troublesome to take out the packaged items.

Furthermore, since a large amount of packaging and packaging materials are required, there is a problem that not only is the cost high, but also the amount of waste is large, which is not desirable from the viewpoint of effective use of resources.

The present invention was made in order to solve these problems, and it is a collective packaging that can be easily attached to the packaged items, does not require much material cost, and can take out the required amount of the packaged items into containers. The purpose is to provide materials.

[Means for Solving the Problems] The collective packaging material of the present invention is composed of a pair of composite sheets formed by laminating a heat-resistant layer and a heat-sensitive adhesive layer directly or via another layer, and these sheets include: The heat-sensitive adhesive layer is disposed on the upper and lower sides of a plurality of items to be packaged aligned on the same plane so as to be in contact with the upper and lower surfaces of the items to be packaged, respectively. It is characterized by

In the present invention, such a heat-resistant layer may be a normal high-density polyethylene film, low-density polyethylene film, stretched low-density polyethylene film, double-stretched polyester film, stretched nylon film, unstretched nylon film, polycarbonate film, polyethylene terephthalate film, or the like. It can be composed of polyester films such as polybutylene terephthalate films, stretched polypropylene films, unstretched polypropylene films, polyvinyl chloride films, known plastic foam films, nonwoven fabrics, paperboards, corrugated paperboards, and the like.

Also, such a heat-resistant layer can be constructed from a transparent, print-compatible material, such as a polyester film, especially in order to print on the inside and increase its commercial value.

In the present invention, the heat-sensitive adhesive layer laminated with these heat-resistant layers is made of modified copolymer polyester resin, low-density polyethylene, polypropylene, unsaturated carboxylic acid-modified polyolefin resin, ethylene-vinyl acetate copolymer (EVA
), ethylene-ethyl acrylate copolymer (EEA),
Ethylene-acrylic acid copolymer (EAA) It is desirable to select a material that has the best adhesion to the upper and lower surfaces of the packaged material from among ionomers, saponified EVA, etc., and to construct it using this material.

Particularly when plastic products are collectively packaged, it is most desirable to use an unsaturated carboxylic acid-modified polyolefin resin because it is necessary to contact the plastic at a low temperature so that the plastic does not undergo thermal deformation.

In addition, as a heat-sensitive adhesive layer, EVA and EEA are used.

Like EAA, ionomer, unsaturated carboxylic acid modified polyolefin resin, the peel strength is 600-1500g/
It is desirable to use a material that is as small as 15a11 and has a function (easy beer function) that makes it easy to peel off again, since the container package can be peeled off into the product.

Furthermore, if the heat-resistant layer is made of a material that has little elongation (100% or less), is brittle and easy to tear, and has a heat resistance that is 30°C higher than the heat-sensitive adhesive layer described below, it can be easily broken during use. This allows you to easily take out the contents.

As such a material, for example, a thin high-density polyethylene film, a thin paper, a thin polyester (PET) film, a thin polyphenylene oxide (PPO) film, etc. can be used.

In the present invention, methods for laminating a heat-resistant thin layer or a heat-resistant layer and a heat-sensitive adhesive layer include a co-extrusion film forming method in which each layer is laminated while extrusion molding at the same time, a pre-formed heat-resistant thin layer or a heat-resistant layer There is an extrusion lamination method in which a heat-sensitive adhesive layer is extruded and attached to the top, or a dry lamination method in which each layer is formed into a film in advance and these dry films are attached via an adhesive resin. , either method can be used.

Here, examples of the adhesive resin include EVA and EEA.

All common adhesive resins for dry lamination such as EAA and ionomers can be used.

Moreover, an intermediate layer such as foam, non-woven material, cardboard board, etc. can be further provided between the heat-resistant layer and the heat-sensitive adhesive layer to improve the cushioning properties and binding properties.

Furthermore, in the present invention, a break line such as a "perforation machine" can be provided around the portions of the sheet that abut the upper and lower surfaces of the packaged object, respectively, passing through the front and back sides.

When such a break line is provided, there is an advantage that these sheets can be torn off along the break line while attached to the packaged items, and the packages can be removed one by one. .

[Function] Such a number of items to be packaged are adhered by a pair of composite sheets arranged on the upper and lower surfaces, respectively, and assembled and combined easily and automatically. The heat-resistant layer maintains sufficient strength without softening or deforming even when the sheet is heated and attached to an object to be packaged.

Further, the heat-sensitive adhesive layer of each sheet is brought into contact with the upper and lower surfaces of the objects to be packaged, and is heated while being pressurized, thereby firmly adhering to these parts and collectively bundling the objects to be packaged.

[Example] Examples of the present invention will be described below.

Example 1 A 15 μl thick heat-resistant thin layer made of high-density polyethylene resin (Tubatic JVO70S manufactured by Mitsubishi Kasei Corporation),
15 μm made of unsaturated carboxylic acid-modified polyolefin resin (Tubatic AP-22OL manufactured by Mitsubishi Kasei Corporation)
I-thick intermediate bonding layer and modified copolymer polyester resin (
15 consisting of Sumitomo Chemical Bond First VC-40)
A heat-sensitive adhesive layer having a thickness of μ was laminated to obtain an upper sheet 1 shown in FIG.

In FIG. 1, numeral 2 indicates a heat-resistant thin layer made of high-density polyethylene resin, and numerals 3 and 4 respectively indicate an intermediate adhesive layer made of unsaturated carboxylic acid-modified polyolefin resin and a modified copolymer polyester resin. A heat-sensitive adhesive layer is shown.

Lamination of these layers was performed in the following manner.

That is, using three-layer coextrusion inflation equipment, each layer was extruded and laminated at the same time, and a 45μtx
After producing a three-layer composite sheet of X 1000 av+X 500 mm, this sheet was cut into a 70 mm width using a slitter.

Also, as shown in FIG. 1, a heat-resistant layer 6 made of a PET film with a thickness of 25 μI and a print 5 printed on the inner surface, and a heat-sensitive adhesive layer 7 made of an EEA film with a thickness of 40 μm are connected to an adhesive layer 8. The lower sheet 9 was manufactured by dry laminating the lower sheet 9.

Using the upper sheet 1 and lower sheet 9 thus produced, a plastic container made of polyvinyl chloride resin was collectively packaged in the following manner.

That is, as shown in FIG. 2, two rows of five plastic containers 10 were arranged as one packaging unit, and the containers were placed on a conveyor belt 11 or the like and conveyed continuously.

Next, the upper sheet 1 and the lower sheet 9 are continuously fed in with their heat-sensitive adhesive layers facing inward and along the top and bottom surfaces of the plastic container 10 being conveyed, respectively, and are placed in the heat press 12. Heat and pressure bonding was carried out with the two pieces in between (100 to 110°C x 3 seconds).

Next, the upper sheet 1 and the lower sheet 9 are cut through a cutting machine 13.
Perforations were made around the parts adhered to the upper and lower surfaces of the plastic container 10, respectively, and at the same time the plastic container was cut to a predetermined size to obtain an assembled package shown in FIG.

By using the upper sheet 1 and the lower sheet 9 of this embodiment, a plurality of plastic containers 10 can be consecutively assembled and automatically packaged, which eliminates the need for conventional bulk packaging. This saves a lot of time and the amount of packaging material used.

In addition, since the heat press bonding by the heat press 12 is instantaneous for 3 seconds, there is no adverse thermal effect on the plastic container 10 to be packaged.

Furthermore, in the assembled package thus obtained, since the upper sheet 1 functions as a lid, no separate cap or the like is required, resulting in material cost savings and no installation effort.

Furthermore, since the heat-sensitive adhesive layer 7 of the lower sheet 9 is made of an EEA film having an easy beer function, the plastic container 10 can be easily pulled from the heat-sensitive adhesive layer 7 of the lower sheet 9 during use. It can be peeled off. Then, tear the upper sheet 1 from the perforation and insert the plastic container 1.
0 can be divided one by one, and these plastic containers 10
The contents can be easily taken out by removing the upper sheet 1.

In addition, if you attach the plastic container 10 with the upper sheet 1 attached and install it in a predetermined position before electrical wiring or piping,
Fixtures can be installed in advance during interior construction, and subsequent construction can be omitted.

Furthermore, even when the upper sheet 1 is attached with the upper sheet 1 attached, the upper layer of the upper sheet 1 is composed of the easily tearable heat-resistant thin layer 2. 1 can be broken through and the specified piping can be carried out as is.

Example 2 Polyester film with a layer thickness of 25μ (manufactured by Toshi Co., Ltd.)
A heat-resistant layer and a heat-sensitive adhesive layer made of Tubatic AP-22OL with a thickness of 30 μm are laminated via a brimer by an extrusion lamination method, and then cut into a predetermined width with a slitter to form the upper sheet 14 shown in FIG. I got it.

In FIG. 4, reference numeral 15 indicates a heat-resistant layer of polyester film, and reference numerals 16 and 17 respectively indicate a heat-sensitive adhesive layer and a brimer made of Tubatic AP-2201.

In addition, in the same manner as the upper sheet 14, a heat-resistant layer 18 of a 2571 m thick polyester film (manufactured by Toshi Co., Ltd.) and a heat-sensitive adhesive layer made of a 40 μH thick modified copolymer polyester resin (Bondine PX3000, manufactured by Sumitomo Chemical) were prepared. 1
9 are laminated via the brimer 20 to form the lower sheet 2.
I got 1.

Next, the upper sheet 14 and lower sheet 21 obtained in this way
Glass soft drink bottles with metal caps were collectively packaged using

That is, as shown in FIG. 5, heat-sensitive adhesive layers 16 and 19 are placed on the upper and lower sides of the glass bottles 22 in which the upper sheet 14 and the lower sheet 21 are arranged in two rows of six bottles each. These are placed between the upper and lower heat press plates 23 and 24, and heated to a temperature of 110℃.
℃, a pressure of 1 kg/cd, and a pressing time of tosec.

The assembled package obtained in this way was sufficiently bundled, and as a result of the handling test, the glass bottle 22
There was no falling off, and no tearing of the upper and lower sheets 14,21 occurred.

Further, since the heating by the heat press is instantaneous, the contents of the packaged glass bottle 22 are not adversely affected by heat.

[Effects of the Invention] As explained above, the collective packaging material of the present invention can automatically package objects to be packaged, such as plastic containers, thereby saving the labor required in conventional bulk packaging.

Furthermore, since the amount of packaging material required is minimal, it is possible to effectively utilize limited resources and reduce the amount of waste.

Furthermore, since the packaged item can be clearly seen from the outside, it is easier to make use of the design, and the appeal of the product is increased.

In addition, it is easy to attach and remove the packaging object, and it is possible to take out the packaging object as many times as necessary.

Furthermore, the upper sheet and the lower sheet are adhered to the upper and lower surfaces of the packaged object by heating, respectively.
Since the heating is instantaneous, there is no adverse thermal effect on the packaged item or its contents.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view of an assembled packaging material consisting of an upper sheet and a lower sheet obtained in Example 1 of the present invention, and FIG. 2 is a sectional view of a plastic container assembled using the assembled packaging material shown in FIG. 1. An explanatory diagram showing the packaging method, FIG. 3 is a perspective view showing a collective package of plastic containers obtained by the method, and FIG. 4 is a collective package consisting of an upper sheet and a lower sheet obtained in Example 2. A cross-sectional view of the material, FIG. 5 is an explanatory view showing a method of collectively packaging glass bottles using the collective packaging material shown in FIG. 4. 1... Upper sheet 2... Heat-resistant thin layer of high-density polyethylene resin 3...
Intermediate adhesive layer 4 made of unsaturated carboxylic acid-modified polyolefin resin... Heat-sensitive bone contact layer 6 made of modified copolymer polyester resin... Heat-resistant layer 7 made of PET film... Heat-sensitive adhesive layer 8 made of EEA film... Adhesive layer 9...lower sheet

Claims (1)

[Claims] (1) Consists of a pair of composite sheets made by laminating a heat-resistant layer and a heat-sensitive adhesive layer directly or via another layer, and these sheets are used to hold multiple items to be packaged aligned on the same plane. A collective packaging material characterized in that the heat-sensitive adhesive layer is disposed on the upper side and the lower side so as to be adhered to the upper surface part and the lower surface part of the object to be packaged.