TW472017B - Package material and container - Google Patents

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 50 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

472017 V. Description of the Invention (1) [Technical Field of the Invention] The present invention relates to a packaging material and a container. [Explanation of Conventional Technology] According to the 'easy-opening packaging material' which has easy peelability, it can be roughly divided into interface peeling type, interlayer peeling type, and agglutination 1 depending on the peeling mechanism. Among them, the 'aggregation-peeling type material #' is an eva-based material that exhibits easy peeling through internal agglomeration failure generated when the peeling layer is opened. This is an eva-based material or an adhesive material. And other incompatible polymers, the second has the characteristics of stability of peel strength at the sealing temperature τ, clamping: content: excellent characteristics. The "impurity seal 2 /" mentioned here means that even if there are large particles mixed with heat sealable material, it can still have good heat seal performance. Fan Cinzhi [Solutions of Invention] However, the conventional easy-to-open material that belongs to agglutination failure type is easy to form a peeling layer resin on the peeling surface of the passenger seal; =: the phenomenon of wire drawing "... due to the control of peeling strength ： Will: Yi ί ί Ή as the covering fixture, because the peeling strength is too high :: Ask "The paper of the covering fixture destroys this so-called" paper peeling ". Furthermore, it is used to squeeze the unsealed material by extrusion lamination In cases such as films and metal falls, the obtained material is easy to be opened and curled, so it is heat-sealed as a lid material; there are also many inconveniences during the second feeding and handling, which is also the problem. Keep in mind,

472017

4 / ZU 丄 /

Fig. 1 is a cross-sectional view showing another example of the layered structure of the packaging material of the present invention. Figure 3 Sun Taihuan Da a a + n < Chess-like character description: the container used when the circle 3 material is peeled from the covering fixture: Second, the "packaging material" is a cross-sectional view of the cover material, (C ) / Poor 1 Qiu ^ is a perspective view of Gu Yi, (b) is a partial cross-sectional view of the peeling part of X part 衿. Sub-material 枓 peeling of the present invention, such as ,, layer 3, and heat seal 2 layers; structure. ° At least as shown in Figures 1 and 2 'is formed by laminating the substrate; the two heat seal layers 2 are made of different trees and are designed to be beautiful materials layers such as paper ( A, 2B). In the example of Fig. 1, and in the example of 2, V pre: the heat seal layer is directly formed into a film by extrusion coating method. The figure is then followed by =; = two 'and then dry lamination method, etc. As the base material, you can use the above-mentioned d, 氏, metal 帛, single-structure of plastic film, laminated with dioxide or Lr. Plastic film can be formed into a film. Vapor deposition of aluminum-like oxide or aluminum-like metal thin film The packaging material 2 A and resin layer 2 b of the present invention are composed of a polyethylene mixed with a polymer at a ratio of 55 to 5%. Upper unsaturated The heat-sealing layer 2 'in the carboxylic acid copolymerization bucket is shown in FIG. 1, which is formed by successively layering the tree-moon layer; the resin layer 2A is composed of a low density of 75 parts by weight, polybutene_ [1] It is made of 45 ~ 25 weight. The resin layer 2B is the resin layer 2 on the B side of the above-mentioned resin layer 2 which is composed of ethyl acetate in the laminated layer with the base material 3. Configured by

472017 V. Description of the invention (4) The heat-sealing layer 2 is such that the resin layer 2B and the substrate face each other near the substrate. Easy to say layering. The above-mentioned mixed layer 2A of low-density polyethylene and polybutene_ [丨] is formed as a release layer which can cause agglomeration and destruction when it is opened. Polybutene_ [1] is non-phase-compatible with low-grade ethylene, and its mixture will form a so-called "structure", so the cohesive force of the peeling layer will be reduced, and the easy-to-peel type of the destructive type will be reduced. When the ratio of polybutadiene_⑴ is less than 2 =: the peeling strength will be too strong. If polyethylene-coated paper is used as the covering layer, the strength will be insufficient, and it will be easy to cause a thread pull. phenomenon. As the ethylene-unsaturated carboxylic acid copolymer, a polyacrylamide copolymer or EAA (ethylene 1 enoic acid copolymer) can be used. By * agglomerating the resin layer 2B of the ethyl L unsaturated carboxylic acid copolymer adjacent to the i-boundary of the concentrated lion layer, the strength of the feminization can simultaneously suppress the occurrence of the drag ... by the olefin-unsaturated carboxylic acid The effect of the acid copolymer layer and curly layer in the q layer. ^ The heat-seal layer and the substrate are laminated = the layer, the layer and the 2B layer can be a certain layer: layer. As a thermal method for forming the core layer and the 2B layer, a thermal lamination method, a lamination method, a lamination method of the substrate 3 and the like can be used. Yiming / mouth-type lamination method, co-extrusion

When the thickness of the 2A layer of the heat-sealing layer is less than 5 // ffl, the seal of the inclusions will become inadequate when the thickness is unstable, and the seal strength is easy to become.

472017 V. Description of the invention (5) When the thickness of the layer is more than 1 5 # m ', it is easy to cause the wire drawing phenomenon when it is opened. On the other hand, when the thickness of the 2B layer forming the heat-sealing layer is thinner than the 2A layer, the curl when the heat-sealing layer and the substrate are laminated will increase ', and the co-extrusion method is used to make the laminate of the 2A layer and the 2B layer Difficulties also arise during processing. When the melting point of the low-density polyethylene contained in the above-mentioned 2A layer of the heat-sealing layer exceeds 110 ° C, the heat-sealing strength at low temperature will be weakened, and it will become easy to cause drafting. When the low density polyethylene of ethylene and? -Olefin copolymer is used for the 2A layer, so-called LLDPE, the sealing strength becomes stronger, and paper peeling tends to occur. As the above-mentioned 28-layer low-density polyethylene used for the heat-sealing layer, the density is preferably 0.915 to 0.9 2 0, the MFR is 0.5 to 50, and the high-pressure method low density in the range of 20 to 50 is preferable. Polyethylene. When the melting point of polybutadiene- [1] is lower than 12 (rc), the sealing strength will be enhanced, so that paper peeling is easy to occur when peeling. When using butyl cyanide- [丨] as the main body, it will make it different from other olefins. In the case of a copolymer obtained by copolymerization, the sealing strength is enhanced, and paper peeling is liable to occur. Polybutene _ [丨] It is preferable to use a density of 0.905 to 0.91 7 and an MFR of 0.2 to 20. As As the ethylene-unsaturated carboxylic acid copolymer of the 2B layer of the heat-sealing layer, EMAA and EAA can be suitably used. When the melting point of the ethylene-unsaturated carboxylic acid copolymer is higher than that of the low-density polyethylene used in the above 2A layer, 924〜〇 When the opening will be prone to draw. Phenomenon is easy to occur. Regarding EMAA, it is preferred to use a density of 0.93 〇 ~ 0.940 'MFR is in the range of 2 ~ 20. As EAA, a density of 0. 924 ~ 〇 can be used appropriately. · 941, the MFR is in the range of 2 to 20. The following is a description of the opening of the container using the packaging material of the present invention. As shown in FIG. 3 (a), the heat sealing layer of the packaging material i of the present invention and the Be

472017 Five 'invention description (7) "EMAA") (melting point 98t) was formed as the second layer of EMAA layer side was treated with ozone, and a U for ί 2 ί (g, at an extrusion temperature of 300 ° c Co-extruded laminates' to obtain packaging materials of the following composition. Paper (100g / V) / EMAA (20 em) / Release layer (1〇 # [Example 2] 65 parts by weight of low (Hyun, t) polybutene Ene-fluorene (Hyun point 125 035 rereading mixture, as the peel layer to form the first degree # 10m), and EMAA (melting point 98.0) was formed into the second layer (20Hm), soot at the extrusion temperature Co-extruded and laminated at the bottom (50 °° to obtain the following packaging materials. Ming foil (50 #m) / EMAA (2 0 em) / peeling layer (10 [Example 3] except using E unloading instead of EMAA -Except for acrylic copolymer (hereinafter referred to as "EAA") (melting point: 96 t), the same procedure as in Example 1 was performed. That is, "low density polyethylene (melting point: 〇 05)) 6 5 A mixture of parts by weight with 35 parts by weight of polybutene- [1] (melting point 125 ° C) was used as a release layer ^ to become the first layer (thickness 10 #m) 'EAA (melting point 96.0 was formed as the second layer ( Thick 2〇 # m) '一Under the ozone treatment on the side facing the EAA layer, the paper subjected to corona discharge (100 g / m2) was co-laminated at an extrusion temperature of 300 ° C to obtain a packaging material having the following composition. Β Paper (100 g / m2) / EAA (2 0 // m) / peeling layer (10 # m) [Example 4] 65 parts by weight of low-grade male, degree polyethylene (melting point 105 C) and Polybutene_ [1] (Solution C: \ 2D-G0DE \ 90-01 \ 89119224.ptd 4 / ZU 丄 / V. Description of the invention (8) Point 125. 035 parts by weight of the mixture as peeling EMAA (melting point 98 〇C) It is formed as a flute-thin layer, and a sealing film is formed. Here, the layer η is made densely by a multilayer blow molding method. A corona discharge is applied to the ΑΑΑ side of amine. On the -face side of the film, a two-liquid curing type urethane: tethering agent was used as a dry laminate to obtain a packaging material having the following composition. 0 ^ ET / (16 // m) / adhesive layer / EMaa (2〇 #m) / [Embodiment 5] ^ UU um) Dou Dan = Replacement part and polybutene- [1] (melt 5 c) 35 internal injuries as the release layer to form the first layer P), ΕΑΑΑ (melting point 98t) is formed as the second layer of the heart) Under the ozone treatment on the side of the EMAA layer, 3〇 its extrusion temperature (rc laminated on the coextrusion sheet was subjected to a corona discharge treatment of (1〇〇g / m2), the configuration of said packaging material. Paper (100g / m2) / EMAA (2 0 // m) / Release layer (10 # m) [Example 6] Low weight polyethylene (melting point 1 Π ° C) 6 5 parts by weight and polymer 35 parts by weight of a mixture of butene- [丨] (melting point 125 ° C) was formed as a release layer as a first layer (1〇 # π〇, and EMAA (melting point 98 ° C) was formed as a second layer (20 #m) After applying ozone treatment to the side of the EMAA layer, it was co-extruded and laminated on a paper (100 g / m2) treated with a corona discharge at a pressing temperature of 300 t to obtain a package having the following constitution Material: Paper (100g / m2) / EMAA (20 / zm) / Peeling layer (10 // m) [Example 7] Low-polite polyethylene (melting point 105 ° C) 6 5 parts by weight With polybutene-[1] (soluble

C: \ 2D-C0DE \ 90-01 \ 891i9224.ptd Page 12 472017 V. Description of the invention (9) Point 10 0 ° C) 3 5 parts by weight of the mixture, #m), EMAA (melting point 98 t ) Form i 1 _ H to form the first layer (under ozone treatment on the 10 EMAA layer side, the ^-layer (1 0 " m), the corona discharge treatment is applied to the laminated layer: paper two f , The packaging materials described above. G) The above is paid

Paper O_ / m ”/ EMAA (20 / zm) / peeling [Example 8] J A low-density polyethylene (melting point 105t) 65 parts by weight toilet point 1 2 5 t) 3 5 parts by weight was formed as a release layer [ k ㈣ 'to form EMAA (dazzling point 98.〇 into a second layer (S 10 EMAA layer side with ozone treatment, it was pressed at a temperature of 30; compression layer on paper treated with corona discharge (100 g / m :, = packaging material composed as described above. U 彳 inch paper (10 (^ / 1112) / ugly 1 ^ 8 (20 " 111) / release layer (10 to 11) [Comparative example 1] A low-density polyethylene (melting point: 105.080 parts by weight and polybutadiene_ "point 1 2 5 C) 2 0 parts by weight as a release layer is formed to the first tenth centimeter 10 / zm) 'EmaA (Melting point 98.0 is formed as a second layer (thickness 10 # with a thickness of 10 ° under ozone treatment on the side of the EMAA layer), which is extruded and laminated at a compression temperature of 300 ° C to a layer subjected to corona discharge treatment Paper (100g / m2), two, the following packaging materials: 1 transfer paper (100g / m2) / EMAA (20 / zm) / release layer (10 [Comparative Example 2] low density polymer Yikun (melting point 1 〇5 ° c) 5 0 parts by weight with polybutene_ [1 1

"Q

C: \ 2D-CODE \ 90-01 \ 89119224.ptd Page 13 472017 Five 'Explanation of the Invention (ίο)' ----- point 1? 5. = Parts by weight of the mixture is formed as the release layer as the third layer, and EMAA (melting point 98.0 is formed as the second layer). The ozone is applied to the side of the EMAA layer.处 温 _〇 ... The following is described on the paper (1OO_2) where the packaging material is formed, and the lower paper (100g / m2) / EMAA (20 / ζπΟ / release layer (1〇 # m) is obtained. [Comparative Example 3] The second refining point mt) 65 parts by weight with polybutene- " (Hyun ,,-125 C) 35 reset wound mixture was formed as a peeling layer as the first reed (Yan l0 # m ), Low density polyethylene (LDPE) (melting point 105t, Mito / MFR = 7) is formed as a second layer (thickness 20 ^), and the LDpE layer is odor-treated at the extrusion temperature The co-extruded dust was laminated on the paper (100 g / m2) subjected to electricity = discharge treatment at 3 0 ° C to obtain a packaging material paper (100〇§ / #) / 1 ^? (20 # 111) / Release layer (1〇 // 111) [Comparative Example 4] 65 parts by weight of a low-density polyethylene (hereinafter "LLDpE") (melting point ιο ° C) with polybutene- [丨] (Melting point 125.03 parts by weight of the mixed character is formed as a release layer as a first layer (10 // m), BEMAA (melting point 98.0 °) It is the second layer (20M m), which is treated with ozone on the side of the EM AA layer, and it is co-extruded at a pressing temperature of 30 ° C and laminated on the paper treated with corona discharge (100g / m2), the following packaging materials were obtained: Paper (100 珏 / 1112) / £ Renren (20 # 11〇 / Release layer (1〇 # 111) [Test]

472017 V. Description of the invention (11) The low-density polyethylene with a melting point of 1 0 6 t: a base paper (2 8 0 g / m2) for the cup is extruded with a thickness of 20 # m to form a base with a flange portion. Cup-shaped, on the flange portion, the packaging material made in Example 1 was used as a lid material, and heat-sealed under conditions of 1500 t and 0.6 seconds, and then opened, and the peeled surface was broken. surface

Make a microscope observation. Because the peeling layer of the lid material is observed on both the lid material side and the side, the AJ j can be cut; 4 The peeling layer is agglomerated and broken when it is unsealed. In addition, the examples and comparative examples are 106 ° C. The low-density polyethylene (thickness of 20, the packaging material 'compared to the melting point (280g / ni2) at 140 t, 98 ^ ° squeezed the coated cup with the base paper to compare the peel strength and the peeling surface, Heat-sealing was performed under the conditions of seconds for evaluation. "", The condition. The curling is shown by visual observation of the easy opening of the examples and comparative examples. And the occurrence of curling is shown in the following table [Table 1] Peel strength X (N / 15mm) Example 1 5.5 ~ 2 5.0 ~ 3 5.5 ~ 4 6.5 5 4.5

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472017 V. Description of the invention (12) 6 4.0 Slightly small 7 7.0 No small 8 3.0 Slightly more Comparative Example 1 Paper peeling-small 2 2.5 Slightly smaller 3 5.0 More large 4 Paper peeling-packaging material for small examples 1 to 4 It shows that it has a moderate peeling strength, does not cause the "drawing phenomenon" of the peeling surface, and has a small degree of curl. Compared with the release layer, the thickness of the E M A A layer of the packaging material of Example 5 is slightly thinner. Therefore, the curl is slightly more pronounced, and the wire drawing phenomenon is also slightly more. Since the low-density polyethylene has a slightly higher melting point in the packaging material of Example 6, the peeling strength is slightly weaker, and the wire drawing phenomenon is also slightly more. The packaging material of Example 7 had a slightly lower melting point of polybutene- [1], and its peeling strength was slightly stronger. The packaging material of Example 8 had a slightly higher melting point of EMAA, which was the same as the melting point of low-density polyethylene, resulting in slightly more stringing, weaker peel strength, and slightly more significant curling. Since the packaging material of Comparative Example 1 had too small a proportion of polybutene- [1], the peeling strength was too strong and a low peeling phenomenon occurred. The packaging material of Comparative Example 2 had a too large blending ratio of polybutene- [1], so the peeling strength was too weak, and the wire drawing phenomenon was slightly more. Since the packaging material of Comparative Example 3 uses low-density polyethylene instead of the ethylene-unsaturated carboxylic acid copolymer as the second layer system, it has a large number of yarn draws and a large degree of curl. Packaging material of Comparative Example 4 1111

II

\\ 312 \ 2d-code \ 90-01 \ 89119224.ptd Page 16 472017 V. Description of the invention (13) Because the material uses LLDPE instead of low-density polyethylene, the peel strength is too strong, and paper peeling occurs. [Example 9] A mixture of 60 parts by weight of low-density polyethylene (melting point 1.06 t) and 40 parts by weight of polybutene_ "丨" (point 1 25 ° C) was formed as a release layer as a first layer ( Thickness 10 / znO, EMAA (melting point 10 (TC)) was formed into a second layer (thickness of 30 # claw), and under ozone treatment on the side of the EMAA layer, it was extruded at a temperature of 26 ° C, wrong Co-extrusion lamination with a urethane-based fixing agent on the side of the substrate showing the [] -layer structure; obtained; described peeling [from the layer (== ethylene (2Mm) / E7㈣v ed. Continued] This packaging material is used as the lid of a paper cup for instant noodles formed with a melting point of 11 (rc of polyethylene paper (28Og / m2)). When it is unsealed, there is no paper peeling or wire drawing. 6, Easy-opening container with excellent heat resistance. It is rumored that you sealed and [Example 1 0] a low-density polyethylene (melting point 105 < 70) weight point 125t) 30 parts by weight of the mixture as a peel Layer formation :; 10㈣, the ship (Hyun point 98 t) is formed as the second; 1 layer (the thickness of the EMAA layer side is treated with ozone—a (thickness 40 #m), and the test is carried out on the neck ...): Its extrusion temperature is 25 At 0 ° C, / = Lu Erhuan 2 fixed agent is co-extruded and laminated on the frost side of the substrate with the layer structure of "Shi / Polyethylene = Lu material ~ layer material," to obtain the following constitution: Page 7 C: \ 2D-G0DE \ 90-0] \ 89119224.ptd 472017 V. Description of the Invention (14) [Paper (79g / m2 / Polyethylene (2〇 // m) / Aluminum Foil (7 aW / petg〗 ym) / EMAA (40 // m) / release layer (i〇 # m)] this packaging material 'as having [Paper (21 〇g / m2) / Polyethylene (2 〇 / zm) / Ming 羯 (7 / zm) / EMAA (10 #m) Polyethylene (20 / ζηι)] This layer of base paper is used as a lid material for small cups for snacks. When it is unsealed, it is 'no paper peeling or wire drawing' and can be sealed and Easy-opening container excellent in heat resistance. [Example 11] Low density polyethylene (melting point: 105 t :) 65 parts by weight and polybutene- [〗] (melting point 125 ° C) 35 parts by weight The mixture was used as a release layer to form a first layer (thickness 10 // m), and EMAA (melting point 100 ° C) was formed into a second layer (thickness 35 // ^). The ozone was applied to the side of the EMAA layer. , And co-extruded it at an extrusion temperature of 29 ° t to a layer having [PET (12 // m) / aluminum foil 1〇em);] The packaging material of the following structure is obtained on the foil side of the base material of this one-layer structure. [PET (12 / im) / aluminum foil (10 / zm) / EMAA (3 5 // m) / peel Layer (10 " m)] This packaging material 'is used as the lid material of a paper cup for instant noodles formed from polyethylene coated paper (240g / m2) with a melting point of 107 ° C on the inside, when it is unsealed' There is no paper peeling or wire drawing, and an easy-opening container with excellent sealing and heat resistance can be obtained. [Effect of the Invention] The packaging material of the present invention has a heat-sealing layer including a release layer. When the heat-sealed portion sealed by heat-sealing with this packaging material is peeled off and unsealed | it will cause agglutination and destruction in the peeling layer, and will exhibit easy-opening property. And, at the door

\\ 312 \ 2d-code \ 90-01 \ 89119224.ptd Page 18 472017 V. Description of the invention (15) The seal will not cause the thread pulling phenomenon when it is sealed. When this packaging material is used as a lid material for a paper cup with polyethylene inside, a sealed paper cup having an easy opening property can be obtained. The container thus obtained has excellent usability for consumers. [Description of component numbers] 1 Packaging material 2 Heat-seal layer 3 Substrate 4 Adhesive layer 10 Covered body 11 Covered body heat-seal layer 13 Heat-sealed portion 14 Peel-off portion 20 Container 21 Cover 22 Container body 23 Flange portion 30 hot plate

C: \ 2D-CODE \ 90-01 \ 89119224.ptd Page 19 4 / ZU1 / Simple Explanation Figure 1 is a schematic cross-sectional view of an example of the layer structure of the packaging material of the present invention Figure 2 is the date and month packaging material of the present invention Other examples of layers and structures are shown in a schematic cross-section. FIG. 3 is a conceptual diagram for explaining the packaging material of the present invention when it is peeled from the coating and fixing body, (a) is a heat-sealed state, and (), H status. ,,,, and the peeling of the sealing part = 4 are only examples of using the packaging material of the present invention as a lid material. (Q) Select empty ^ cry + force, and some of the sealing parts are published. Figure (b) is a sectional view of part X_X, and (c) is a partial sectional view. (D) Peeling part when the lid material is peeled

Claims (1)

4 / ZUi / VI. Patent Application Fanyuan 1. An easy-opening packaging material, characterized by: 埶 ί ί material and a heat-sealing layer provided on one side of the substrate, the above 2 and 4 are close to the above substrate Starting from the side, in the order of the ethylene-unsaturated layer: the "layer", the resin layer (A) containing 55 ~ 75 parts by weight of low density ^ 1 f 5 parts by weight of polybutene- [I] The structure is an extrusion structure, and the resin layer ⑴ and the resin layer 上述 are laminated with each other by a coextrusion method.乂 2 If the thickness of item i in the scope of the patent application is between 5 and 15 layers (A) above the resin layer u) two or two and the above resin layer ⑻ ^ 3 Thinner: Packing materials' where the Low-density polymer 1] is a melting point of 12. . . The above method of low lift polyethylene? The melting point of the polybutylene carboxylic acid copolymer is described by the above-mentioned ethylene ~ unsaturated ones. The melting point is lower than the low density polyethylene. Industrial alfalfa + —Du Ethylene series refining point 11 kt κ2 /, containing materials, where the low-density polyfluorene- [1] series melting point mt is based on the low-density polyethene copolymer The melting point, 俜 r =: matter, and 'the above ethylene ~ unsaturated ones. It is lower than the melting point of the above-mentioned low-density polyethylene by two: Hi! Range items 1 to 4 of any-item of packaging materials,-middle § mysterious heat sealing layer is tired of the soldiers by sharing 6-Record the main door It is known that the delamination method is used to laminate the above substrate. 6: A kind of easy-opening: container, which is characterized by: 月 "Monthly patent car 巳 巳 i item i to 4 of any-item of packaging materials, as U \\ 312 \ 2d-code \ 90-01 \ S9119224.ptd Page 21 472017 VI. Patent application range: Melting point: 1 0 5 ~ 1 1 5 ° C: The innermost paper cup container is heat sealed. At the time of unsealing, the resin layer (A) is an agglutination disruptor. 7. An easy-opening container, which is characterized by: using the packaging material in the scope of patent application No. 5 as the lid material of a paper cup container coated with polyethylene with a melting point of 105 to 115 ° C, and heat-sealing, unsealing In this case, the resin layer (A) is an agglutination disruptor. \\ 312 \ 2d-code \ 90-01 \ 89119224.ptd Page 22