CN1288848A - Package material and container - Google Patents

Package material and container Download PDF

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Publication number
CN1288848A
CN1288848A CN00130681A CN00130681A CN1288848A CN 1288848 A CN1288848 A CN 1288848A CN 00130681 A CN00130681 A CN 00130681A CN 00130681 A CN00130681 A CN 00130681A CN 1288848 A CN1288848 A CN 1288848A
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CN
China
Prior art keywords
layer
fusing point
packing
microns
resin bed
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CN00130681A
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Chinese (zh)
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CN1122624C (en
Inventor
高桥秀明
杉山康晴
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Dai Nippon Printing Co Ltd
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Dai Nippon Printing Co Ltd
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Publication of CN1288848A publication Critical patent/CN1288848A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • B32B37/153—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state at least one layer is extruded and immediately laminated while in semi-molten state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D1/00—Containers having bodies formed in one piece, e.g. by casting metallic material, by moulding plastics, by blowing vitreous material, by throwing ceramic material, by moulding pulped fibrous material, by deep-drawing operations performed on sheet material
    • B65D1/22—Boxes or like containers with side walls of substantial depth for enclosing contents
    • B65D1/26—Thin-walled containers, e.g. formed by deep-drawing operations
    • B65D1/28—Thin-walled containers, e.g. formed by deep-drawing operations formed of laminated material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
    • B65D77/00—Packages formed by enclosing articles or materials in preformed containers, e.g. boxes, cartons, sacks or bags
    • B65D77/10—Container closures formed after filling
    • B65D77/20—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers
    • B65D77/2024—Container closures formed after filling by applying separate lids or covers, i.e. flexible membrane or foil-like covers the cover being welded or adhered to the container
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2323/00—Polyalkenes
    • B32B2323/04—Polyethylene
    • B32B2323/046—LDPE, i.e. low density polyethylene
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2435/00—Closures, end caps, stoppers
    • B32B2435/02—Closures, end caps, stoppers for containers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Ceramic Engineering (AREA)
  • Laminated Bodies (AREA)
  • Wrappers (AREA)
  • Packages (AREA)
  • Closures For Containers (AREA)

Abstract

This invention provides a packaging material and a container having a few curl, no stringiness when torn and easy to tear in a field of the container torn by peeling the heat sealed part of a sealed container. The packaging material comprises at least a base material and a heat sealing layer. In this case, the sealing layer has a laminated structure obtained by providing a resin layer B made of an ethylene-unsaturated carboxylate copolymer from the side near the base material, and a resin layer A containing a low density polyethylene of 55 to 75 weight percents and a -poly(1-butene) of 45 to 25 weight percents provided in this order in such a manner that the layers A and B are laminated to one another by a co-extrusion method. When the packaging material is heat sealed as the cover material of a paper cup container coated on its innermost layer with the polyethylene having a melting point of 105 to 115 DEG C, the layer A is cohesively broken when torn.

Description

Packing and container
The present invention relates to packing and container.
Easy unlatching packing with easy fissility are exfoliated because of the difference of mechanism for stripping is divided into interface peel type, splitting type and aggegation.In these materials, the peel ply resin of the exfoliated material of aggegation demonstrates its easy fissility because of producing inner aggegation destruction when opening.As the exfoliated material of aggegation, immiscible polymeric blends such as the known EVA based material that paraffin is arranged, be mixed with bonding material, polyolefin/polystyrene or polyethylene/polypropylene system, they have excellent characteristics such as the sealing-in of stability, inclusion of the sealing temperature of peel strength and anti-content." sealing-in of good inclusion " described here is to be illustrated in still to have good heat sealing performance when bigger sized particles inclusion is sneaked into the heat sealing material.
But there is the problem of the what is called " wire drawing " that is easy to remaining fibrous peel ply resin on the sealing-in release surface in the existing easy unlatching material that belongs to the aggegation damage type when opening.In addition,, when to be coated with poly paper as the time, to cross to force because of peel strength and destroy, and be easy to generate the problem of what is called " paper peeling phenomenon " by the paper of convered structure by the sealing-in body because be difficult to control peel strength.
In addition, when methods such as adopting the extruding layer platen press is pressed in existing easy unlatching material layer on the base materials such as paper, film or metallic paper, crimping takes place in resulting easy unlatching packing easily, can produce many such as problems such as supply, troublesome poerations when being connected to lid material heat-sealing on the container.
Problem of the present invention is the technical field that is the heat sealing of airtight container is partly peeled off the container of unlatching, provides a kind of and has that crimping is few, the packing and the container of not wire drawing when opening, opening easiness.
The easy unlatching packing that the present invention relates to are characterised in that, wherein be provided with the heat sealing layer by base material with in a side of this base material at least and constitute, described heat sealing layer is near the base material side resin bed of being made by ethene-copolymers of unsaturated carboxylic acids (B) being set in turn and containing the low density polyethylene (LDPE) of 55 to 75 weight portions and contain the resin bed (A) of the polybutene of 45 to 25 weight portions, and the cambium layer laminated structure, described resin bed (A) and resin bed (B) are by the mutual lamination of coetrusion.
In addition, the easily-openable container that the present invention relates to is characterised in that, is that the packing of lid material of 105-115 ℃ poly dixie cup container carry out heat sealing as innermost layer being coated with fusing point, and described resin bed (A) aggegation takes place destroys when opening.
The thickness of described resin bed (A) is in the scope of 5-15 micron, and the thickness that the thickness of described resin bed (B) cans be compared to most described resin bed (A) more greatly.
In addition, described low density polyethylene (LDPE) is that fusing point is the low density polyethylene (LDPE) made from high-pressure process below 110 ℃, and, described polybutene is at the homopolymer of fusing point more than 120 ℃, in addition, preferably the fusing point than described low density polyethylene (LDPE) is lower for the fusing point of described ethene-copolymers of unsaturated carboxylic acids.
In addition, the most handy co-extrusion laminating method is pressed in described heat sealing on the described base material layer by layer.
Fig. 1 is the pattern cross sectional drawing of an example of the laminar texture of expression packing of the present invention.Fig. 2 is the pattern cross sectional drawing of another example of the laminar texture of expression packing of the present invention.Fig. 3 is the scheme drawing of explanation with the state of packing of the present invention when being peeled off by convered structure, (a) is the state behind the heat sealing, (b) is the state that heat sealing is partly peeled off.Fig. 4 is that expression is with the embodiment of packing of the present invention as the container of lid material use, (a) be the transparent view of container, (b) being cross sectional drawing along the X-X line, (c) is the part cross sectional drawing of sealing-in part, the part cross sectional drawing of the released part when (d) being the peel-off covers material.
As depicted in figs. 1 and 2, packing 1 of the present invention are made of substrate layer 3 and heat sealing layer 2 at least, and described heat sealing layer 2 is made of through 2 layers (2A, 2B) that lamination forms mutual different resin at least.As Fig. 1 illustration, be with extruding cladding process with heat sealing layer direct system film on base materials such as paper, as Fig. 2 illustration, be that the system film forms heat sealing layer 2 earlier, adopt method such as dry lamination method by adhesive agent 4 this heat sealing layer 2 to be fitted on the base material such as plastic sheeting then.
As base material, can use paper, metallic paper or plastic sheeting separately, perhaps can use the laminated product more than 2 kinds in these materials.Plastic sheeting can be as the oxide of silicon or aluminium or the formed evaporated film of the metallic film the aluminium.
As shown in Figure 1, heat sealing layer 2 in the packing of the present invention is used by resin bed 2A and resin bed 2B does not have the coetrusion lamination of adhesive agent to constitute, wherein resin bed 2A is mixed by the low density polyethylene (LDPE) of 55-75 weight portion and the polybutene of 45-25 weight portion, and resin bed 2B is formed by polyethylene-copolymers of unsaturated carboxylic acids.The resin bed 2B side that in above-mentioned heat sealing layer 2 and base material 3 are stacked above-mentioned ethene-copolymers of unsaturated carboxylic acids is formed is configured in the base material side and carries out lamination.In other words, sealing layer 2 is to carry out lamination with respect to base material.
The mixture layer 2A of above-mentioned low density polyethylene (LDPE) and polybutene can produce aggegation and destroy and the formation peel ply when Kaifeng.Polybutene and low density polyethylene (LDPE) come down to immiscible, and their compound forms so-called " island structure ", thereby reduce the cohesive force of peel ply, so can present the easy fissility of aggegation damage type.If the ratio of polybutene is less than 25% weight portion, then peel strength is too high, when to be coated with poly paper as by convered structure the time, can produce the paper peeling phenomenon.When the ratio of polybutene surpasses 45% percentage by weight, the peel strength deficiency, thereby be easy to generate the wire drawing phenomenon.
As ethene-copolymers of unsaturated carboxylic acids, can use EMAA (ethene-methacrylic acid copolymer) or EAA (ethylene-acrylic acid copolymer).The resin bed 2B of ethene-copolymers of unsaturated carboxylic acids is adjacent to peel ply and is provided with, and therefore the aggegation of peel ply destroys and can concentrate near the boundary line of 2A layer and 2B layer when Kaifeng, makes peel strength stable, and can suppress the generation of wire drawing.In addition, owing to be provided with ethene-copolymers of unsaturated carboxylic acids layer, when heat sealing layer and base material are carried out lamination, has the effect of inhibition crimping.
2A layer and 2B layer are carried out lamination, can easily form the heat sealing layer according to predetermined layer ratio.Method as the heat sealing layer 2 that will be formed by 2A layer and 2B layer and base material 3 carry out lamination can adopt dry lamination method, laminboard layer laminating or co-extrusion laminating method.
If the thickness of heat sealing layer 2A less than 5 microns, then makes sealing strength become unstable easily, also can make the inclusion sealing-in become not enough.In addition, if the thickness of heat sealing layer 2A surpasses 15 microns, then when opening, be easy to produce wire drawing.On the other hand, when the thickness of the 2B layer that forms the heat sealing layer was thinner than 2A layer, then the crimping when heat sealing layer and base material lamination can become greatly, and made and adopt coetrusion that the lamination process of 2A layer and 2B layer is also become difficult.
The fusing point of the low density polyethylene (LDPE) that contains on the above-mentioned 2A layer of heat sealing layer is if surpass 110 ℃, and then the heat sealing intensity under the low temperature can weaken, and also is easy to generate wire drawing.In addition, when the straight chain shape low density polyethylene (LDPE) of the copolymer that in the 2A layer, uses ethene and alhpa olefin, during promptly so-called LLDPE, then can improve sealing strength and be easy to generate the paper peeling phenomenon.The low density polyethylene (LDPE) that uses as the above-mentioned 2A layer of heat sealing layer is the low density polyethylene (LDPE) that forms with high-pressure process in 0.5-50 (being preferably 20～50) scope in density as 0.915-0.920, MFR preferably.
If the fusing point of polybutene is less than 120 ℃, and then sealing strength is higher, is easy to generate paper and peels off when peeling off.With the butene-1 be main body when utilizing the copolymer that the alpha-olefinic copolymerization of this butene-1 and other produces, sealing strength is higher, and paper peels off easily.Preferably adopting density is that 0.905-0.917, MFR are the polybutene in the 0.2-20 scope.
As the ethene-copolymers of unsaturated carboxylic acids of the 2B layer of heat sealing layer, be suitable for and adopt EMAA, EAA.When the low density polyethylene (LDPE) that the fusing point of ethene-copolymers of unsaturated carboxylic acids is adopted than above-mentioned 2A layer is high, when opening, be easy to generate wire drawing.EMAA be suitable for use density as 0.930-0.940, MFR as in the 2-20 scope.As EAA, can adopt density is that 0.924-0.941, MFR are more suitable in the 2-20 scope.
Below, the situation that the container that uses packing of the present invention is opened is described.Shown in Fig. 3 (a), the heat sealing layer that makes packing 1 of the present invention with faced mutually by the heat sealing layer of convered structure 10, carry out heat sealing by a heating plate 30, form heat sealing part 13.When this heat sealing part 13 was peeled off (unlatching), shown in Fig. 3 (b), the 2A layer that is formed by hybrid resin of heat sealing layer 2 produced aggegation destruction 14, demonstrates opening easiness, thereby forms the release surface that does not have wire drawing.
When the base material 3 of lamination is paper, aluminium foil or sealed polyethylene plastic mutually with heat sealing layer 2, constitute heat sealing layer 2 by 2A layer and 2B layer and can adopt the co-extrusion laminating method directly to press at layers on substrates, make the course of processing simple.
Shown in Fig. 4 (a), packing of the present invention are suitable for use as and are coated with the lid material 21 of heat sealing in the poly dixie cup container 22.Lip shape crimping pressurization to the vessel 22 of paper container forms level and smooth flange 23, and lid 21 seals and is connected to this flange portion and forms sealing.When opening, the heat sealing of lid is partly peeled off.When using packing of the present invention as the lid material, the state of peeling off during unlatching is shown in figure (d).Above-mentioned paper container can be widely used in and hold instant noodles series, yogurt, snack class and natto food such as (steaming the soy food product that alcohol is sent out in the back).Owing to,, can avoid in the paper container, producing on the release surface problem of wire drawing simultaneously in the past so can provide release surface good opening easiness with the lid material of packing of the present invention as the paper container.
Next, specifically describe packing of the present invention and container, but the present invention is not limited to this.
[embodiment 1]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with ethene-methacrylic acid copolymer (below be recited as [EMAA] (fusing point is 98 ℃) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in EMAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EMAA (20 microns)/peel ply (10 microns)
[embodiment 2]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer (thickness is 20 microns), under 300 ℃ extrusion temperature, on aluminium foil (thickness is 50 microns), carry out co-extrusion laminating, can obtain the packing of following structure.
Aluminium foil (50 microns)/EMAA (20 microns)/peel ply (10 microns)
[embodiment 3]
Use ethylene-acrylic acid copolymer (hereinafter referred to as [EAA]) (fusing point is 96 ℃) to replace EMAA, undertaken by embodiment 1 same mode.Promptly, with the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EAA (fusing point is 96 ℃) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in EAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EAA (20 microns)/peel ply (10 microns)
[embodiment 4]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer, make diaphragm seal by the multilayer film blowing, after the EMAA of this film layer side carried out corona treatment, at thickness is that a side of 16 microns PET film uses 2 solution curing type polyurethane series adhesive agents to carry out dry lamination, can obtain the packing of following structure.
PET (16 microns)/adhesive layer/EMAA (20 microns)/peel ply (10 microns)
[embodiment 5]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 20 microns) as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer (thickness is 10 microns), carry out ozone treatment in EMAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EMAA (10 microns)/peel ply (20 microns)
[embodiment 6]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 111 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in EMAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EMAA (20 microns)/peel ply (10 microns)
[embodiment 7]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in EMAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EMAA (20 microns)/peel ply (10 microns)
[embodiment 8]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 105 ℃) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in EMAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EMAA (20 microns)/peel ply (10 microns)
[comparative example 1]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 80 weight portions and 20 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in EMAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EMAA (20 microns)/peel ply (10 microns)
[comparative example 2]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 50 weight portions and 50 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in EMAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EMAA (20 microns)/peel ply (10 microns)
[comparative example 3]
With the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with low density polyethylene (LDPE) (LDPE) (fusing point is 105 ℃, density=0.92, MFR=7) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in LDPE layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/LDPE (20 microns)/peel ply (10 microns)
[comparative example 4]
With the compound of the polybutene (fusing point is 125 ℃) of the straight chain shape low density polyethylene (LDPE) (hereinafter referred to as [LLDPE]) (fusing point is 110 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer (thickness is 20 microns), carry out ozone treatment in EMAA layer side, and at the paper (100g/m through corona treatment 2) go up and under 300 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
Paper (100g/m 2)/EMAA (20 microns)/peel ply (10 microns)
﹠amp; #60 tests ﹠amp; #62
To scribble 20 micron thickness by extruding, molten point is the system cup body paper (280g/m of 106 ℃ low density polyethylene (LDPE) 2) be processed into cup-shape with flange portion, after the heat sealing, it is opened under 150 ℃, 0.6 second condition as the employed packing of lid material among its flange portion and the embodiment 1, with the section of microscopic examination release surface.Observe the peel ply that covers material from the both direction of lid material side and cup side, can confirm that peel ply has produced aggegation destruction when opening.
In addition, with the packing made in each embodiment and the comparative example with scribble the system cup body paper (280g/m that fusing point is 106 ℃ a low density polyethylene (LDPE) (thickness is 20 microns) by extruding 2) under 140 ℃, 98Kpa, 1 second condition, carry out heat sealing, relatively their peel strength and the wire drawing situation of release surface.The crimping situation that detects by an unaided eye is made an appraisal.
That a situation arises is as follows for easily openable in embodiment and the comparative example and crimping.[table 1]
Peel strength (N/15mm) The wire drawing of release surface Crimping
Embodiment
????1 ????5.5 Do not have Little
????2 ????5.0 Do not have Little
????3 ????5.5 Do not have Little
????4 ????6.5 Do not have Little
????5 ????4.5 Many slightly In
????6 ????4.0 Many slightly Little
????7 ????7.0 Do not have Little
????8 ????3.0 Many slightly In
Comparative example
????1 Paper peels off ????- Little
????2 ????2.5 Many slightly Little
????3 ????5.0 Many Greatly
????4 Paper peels off ????- Little
Packing among the embodiment 1-4 have the peel strength of appropriateness, do not produce wire drawing on the release surface, and crimping is also less.The peel ply of the packing of embodiment 5 than the thin thickness of EMAA layer some, so crimping is obvious slightly, wire drawing is also more slightly.The packing of embodiment 6 because the fusing point of low density polyethylene (LDPE) is higher, weaken peel strength slightly, and wire drawing also slightly increases.The packing of embodiment 7, because the fusing point of polybutene is lower, peel strength strengthens slightly.The packing of embodiment 8, because the fusing point of EMAA is higher and identical with the fusing point of low density polyethylene (LDPE), so wire drawing slightly increases, peel strength also weakens, and makes crimping obvious slightly.
Packing in the comparative example 1 because the cooperation ratio of polybutene is lower, strengthen peel strength, have produced the paper peeling phenomenon.Packing in the comparative example 2 because the cooperation ratio of polybutene is higher, weaken peel strength, and wire drawing is also more slightly.The packing of comparative example 3 make wire drawing become many owing to the 2nd layer of use low density polyethylene (LDPE) replaces ethene-copolymers of unsaturated carboxylic acids, and it is big that crimping also becomes.The packing of comparative example 4 owing to use LLDPE to replace low density polyethylene (LDPE), strengthen peel strength, produce the paper peeling phenomenon.
[embodiment 9]
Aluminium foil one side at the base material of laminar texture with [paper/polyethylene/aluminium foil], by the polyurethanes sticking agent with the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 106 ℃) of 60 weight portions and 40 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 100 ℃) as the 2nd layer (thickness is 30 microns), carry out ozone treatment in EMAA layer side, under 260 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
[paper (76g/m 2)/polyethylene (20 microns)/aluminium foil (7 microns)/EMAA (30 microns)/peel ply (10 microns)]
This packing are 110 ℃ of poly paper (280g/m as being coated with fusing point by inside face 2) the lid material that is used for the instant noodles dixie cup made, when opening, can not produce paper and peel off phenomenon with wire drawing, can obtain to have the good leak tightness and the container of stable on heating opening easiness.
[embodiment 10]
PET one side at the base material of laminar texture with [paper/polyethylene/aluminium foil/PET], by the polyurethanes sticking agent with the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 70 weight portions and 30 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 98 ℃) as the 2nd layer (thickness is 40 microns), carry out ozone treatment in EMAA layer side, under 250 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
[paper (79g/m 2)/polyethylene (20 microns)/aluminium foil (7 microns)/PET (12 microns)/EMAA (40 microns)/peel ply (10 microns)]
This packing are used as by having [paper (210g/m 2)/polyethylene (20 microns)/aluminium foil (7 microns)/EMAA (10 microns)/polyethylene (20 microns)] the lid material that is used for snack dessert dixie cup made of the body paper of laminar texture, when opening, can not produce paper and peel off phenomenon with wire drawing, can obtain to have the good leak tightness and the container of stable on heating opening easiness.
[embodiment 11]
Aluminium foil one side at the base material of laminar texture with [PET (12 microns)/aluminium foil (10 microns)], with the compound of the polybutene (fusing point is 125 ℃) of the low density polyethylene (LDPE) (fusing point is 105 ℃) of 65 weight portions and 35 weight portions the 1st layer (thickness is 10 microns) as peel ply, with EMAA (fusing point is 100 ℃) as the 2nd layer (thickness is 35 microns), under 290 ℃ extrusion temperature, carry out co-extrusion laminating, can obtain the packing of following structure.
[PET (12 microns)/aluminium foil (10 microns)/EMAA (35 microns)/peel ply (10 microns)]
This packing are 107 ℃ of poly paper (240g/m as being coated with fusing point by inside face 2) the lid material of the dixie cup that is used for yogurt made, when opening, can not produce paper and peel off phenomenon with wire drawing, can obtain to have the good leak tightness and the container of stable on heating opening easiness.
Packing of the present invention have the heat sealing layer that comprises peel ply.The leak free heat sealing part of using this packing to carry out the heat sealing mode and forming produces aggegation at peel ply and destroys when opening this heat seal lands, shows its opening easiness.And part can not produce the wire drawing phenomenon in Kaifeng.
Therefore, when this packing are used as when being the lid material of the dixie cup that forms of poly material by inside face, then obtained to have the leak free dixie cup of opening easiness.The container that is obtained is concerning the customer, and its usability is good.

Claims (5)

1. packing of easily opening, it is characterized in that, it is made of base material and the heat sealing layer that is provided with in a side of this base material at least, described heat sealing layer is from being provided with the resin bed of being made by polyethylene-copolymers of unsaturated carboxylic acids (B) in turn near the base material side and containing the low density ethylene of 55 to 75 weight portion and contain the laminar structure that the resin bed (A) of the polybutene of 45 to 25 weight portion forms, and described resin bed (A) and resin bed (B) pass through the mutual lamination of coetrusion.
2. the packing of putting down in writing as claim 1 is characterized in that, the thickness of described resin bed (A) is in the scope of 5-15 micron, and the thickness that the thickness of described resin bed (B) cans be compared to most described resin bed (A) more greatly.
3. packing as claimed in claim 1 or 2, it is characterized in that, described low density polyethylene (LDPE) is a fusing point at the low density polyethylene (LDPE) made from high-pressure process below 110 ℃, and, described polybutene is that fusing point is at the homopolymer more than 120 ℃, in addition, the fusing point of described ethene-copolymers of unsaturated carboxylic acids is the lowest like the fusing point of described low density polyethylene (LDPE).
4. as any packing of being put down in writing among the claim 1-3, it is characterized in that, described heat sealing is pressed on the described base material layer by layer with the co-extrusion laminating method.
5. container of easily opening, it is characterized in that, it is that the lid material of 105-115 ℃ poly dixie cup container carries out heat sealing that claim 1 is coated with fusing point to the described packing of claim 4 as innermost layer, and described resin bed (A) aggegation takes place destroys when opening.
CN00130681A 1999-09-20 2000-09-20 Package material and container Expired - Fee Related CN1122624C (en)

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