Hot-seal functional stretch film
A functional, film technology, applied in the field of heat-sealable unidirectional or biaxially oriented films, which can solve the problems of decreased heat-sealing properties of polyolefin materials, large directional differences in heat-sealing strength, and difficulty in stabilizing and controlling heat-sealing properties. , to achieve high economy, high mechanical properties, and the effect of solving warpage
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Embodiment 1
[0068] Example 1: A single-sided heat-sealable biaxially stretched packaging material for printing
[0069] At present, most of the biaxially oriented polyolefin films used for gravure printing in the market have no heat-sealing performance or low heat-sealing strength (general heat-sealing strength) ≤ 3N / 15mm). Composite polyolefin film. Therefore, the production process is increased, the production cost, resource cost (including raw materials, energy) and environmental cost (increased carbon emissions, solvent emissions) and the like are increased.
[0070] In this embodiment, in order to lower production costs, save resources and protect the environment, a single-side heat-sealable polyolefin stretch packaging material for printing is designed and developed.
[0071] The packaging material is a two-layer film, the structure is: PP-modified PE
[0072] in:
[0073] ①, PP chooses homopolypropylene:
[0074] ②. Modified PE is composed of polyethylene mixed with at least on...
Embodiment 2
[0081] Example 2: A double-sided heat-sealable uniaxially stretched packaging material for pillow packaging
[0082] The uniaxially oriented polyolefin film currently on the market for candy packaging can only be used for twist packaging because the material has no heat-sealing properties.
[0083] In this example, in order to meet the heat-sealing requirements of lap-sealing inside and outside of automatic pillow-type packaging, a double-sided heat-sealable polyolefin uniaxially stretched packaging material was designed and developed.
[0084] The packaging material is a single-layer or multi-layer film with a symmetrical structure, and the structure is: modified PP-PE-modified PP where:
[0085] ①, PE choose high-density polyethylene:
[0086] ②. Modified PP is composed of polypropylene mixed with at least one of the following four materials, with a density of 0.90±0.04g / cm3. See the table below for details:
[0087] change
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PP
Base
PP0.89...
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