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Packaging laminate, method for producing same, and packaging container produced from the packaging laminate

A packaging laminate, technology for lamination, applied in the field of packaging laminates, for manufacturing packaging laminates and packaging containers made from packaging laminates, capable of solving loss of required capabilities, loss of mechanical strength And other issues

Active Publication Date: 2015-11-18
TETRA LAVAL HLDG & FINANCE SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once the degradation reactions of the polyethylene molecules actually start, these degradation reactions proceed to such an extent that the polymer loses the required ability to maintain the permanent bond strength between the aluminum foil and the paper or board, and thus also loses the mechanical properties. strength

Method used

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  • Packaging laminate, method for producing same, and packaging container produced from the packaging laminate
  • Packaging laminate, method for producing same, and packaging container produced from the packaging laminate
  • Packaging laminate, method for producing same, and packaging container produced from the packaging laminate

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0094] The packaging laminate 10 was produced using the ingredients shown in the table below:

[0095]

[0096]

[0097] The packaging laminate 10 in Example 1 according to the invention was produced by coextruding material layers 13a-13c as a three-layer structure, with the sequence of material layers being 13b / 13a / 13c. Coextrusion can typically be performed at extrusion speeds of 200m / min and extrusion temperatures below 310°C, and without the use of ozone or other additional chemicals to obtain and maintain a permanent bond of the aluminum foil 12 acting as a gas barrier to the packaging layer Press material on paper or cardboard 11. The cardboard material used throughout was a CLC / C material with a bending force of 260 mN. The three layers can be coextruded at a temperature of 290-310-290°C and a web speed of 650m / min with excellent (not measured, above detection limit) adhesion to the paperboard layer or barrier layer.

[0098] The known packaging laminate constit...

Embodiment 2

[0102] Example 1 and Reference Example 1 were repeated at a web speed of 200 m / min, and the two gaps between the exit of the extrusion die and the point of contact of the melt curtain with the web surface were different, ie the air gaps were 195 mm and 310 mm. In addition, the example was repeated with the only difference that the laminate in Reference Example 1 was replaced by a test polymer of LDPE2 produced by polymerization in a tubular reactor which, when extruded as a monolayer laminate, had Poor extrusion performance is expected in the form of high neck-in.

[0103] In Example 2, the laminate was coextruded with a central layer of the same LDPE2 and an external additive layer of the same polymer and layer thickness as Example 1 .

[0104] Equivalent packaging properties (barrier properties and cohesion) to Example 1 were obtained and also a significantly improved extrusion process (reduced neck-in ). The neck-in values ​​expressed in Table 3 are the combined widths (m...

example 3

[0107] Reference Example 2 was repeated with the only difference that the laminate was replaced by the polymer LDPE3 (Dow750E), which was produced by polymerization in a tubular reactor and was not suitable for extrusion according to all available data and recommended practices. Coated and used instead for injection molding and has an MFI as high as 20 g / 10 min at 2.16 g, 190°C. As expected, conventional extrusion lamination could not be performed with this polymer because the neck-in was too large. In Example 3, the laminate was instead coextruded with the same central layer of LDPE3 and an outer additive layer of the same polymer and layer thickness as Example 2.

[0108] Equivalent adhesive properties were obtained, as well as a significantly improved extrusion process (reduced neck-in), including better than expected and equivalent lamination with the single layer autoclave polymerized LDPE in Example 1 . Furthermore, in all examples 1-3, according to the invention it was...

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PUM

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Abstract

Packaging laminate for a packaging container for oxygen-sensitive liquid food, such as milk, juice, wine and cooking oil. The packaging laminate (10) has a layer (11) of paper or paperboard, and a layer (12) serving as gas barrier and composed of a material with barrier properties against gases, in particular oxygen. The layer (12) serving as gas barrier is bonded to the paper or paperboard layer (11) by a lamination layer (13), which has a central layer (13a) of polymer and outer layers (13b and 13c) of an adhesive on both sides of the polymer layer (13a). The packaging laminate (10) also has outer liquid-tight coatings (14 and 15) on both sides of the paper or paperboard layer (11).

Description

technical field [0001] The invention relates to a method for producing a packaging laminate comprising paper or paperboard layers bonded to each other by a laminate layer and a layer serving as a gas barrier, in which method a gas A web of barrier-property material is bonded to a web of paper or cardboard, and the bonded web is guided through a nip between two rotatable cylinders, while at the same time a laminate is applied between the webs space in order to permanently bond these webs to each other. [0002] The invention also relates to a packaging laminate comprising paper or paperboard layers bonded to each other by a laminate layer and a layer serving as a gas barrier. [0003] Furthermore, the invention relates to a packaging container for food products, which is produced by folding a packaging laminate. Background technique [0004] Known packaging laminates of the above-mentioned type generally have a paper or cardboard layer and an outer liquid-tight coating made...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B32B37/15B32B23/06B65D65/40B32B37/12
CPCB32B37/153B32B7/12B32B15/08B32B15/20B32B27/10B32B27/32B32B27/327B32B37/12B32B2270/00B32B2307/7242B32B2317/12B32B2439/70B65D5/064B65D5/067B65D75/26B65D75/48B65D85/80B29C48/15B32B27/00B32B37/15
Inventor 汉斯·约翰逊
Owner TETRA LAVAL HLDG & FINANCE SA
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