Multilayer film and reclosable film packaging
A multi-layer film, packaging technology, applied in the direction of transportation and packaging, packaging, packaged food, etc., can solve the problems of high force, difficult for consumers to apply and control, etc.
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Embodiment 1
[0138] Exemplary outer films 36 were prepared with different blends for adhesive layer 44 . Although, polybutene-1 (PB-1) and olefinic elastomer alone can provide peeling and resealing at some peel strength, and PB-1 generally provides higher strength than olefinic elastomer, but It has been determined that blends of polybutene-1 and olefinic elastomers can help tailor properties to produce more desirable peel forces than either material alone. Additionally, adhesive surfaces made from PB provide the zipper experience, and blending with ethylenic elastomers often helps smooth the peel-open experience. In order to determine ideal blends, the peel force characteristics of exemplary blends of materials for adhesive layer 44 were tested and are shown in the Examples in Table 2 below. The polybutene-1 tested was manufactured by LyondellBasell with the grade designation Toppyl RC3000. The olefinic specialty elastomer tested was manufactured by ExxonMobil under the trade designatio...
Embodiment 2
[0144] Another variable that can be optimized is the thickness of the adhesive layer 44 . It has been determined that varying the thickness of the adhesive layer produces different resulting peel forces and peel operations. As shown in Table 3 below, the polybutene-1 resin layer and the vinyl resin layer were tested with thicknesses varying between 10 μm and 30 μm. The polybutene-1 tested was manufactured by LyondellBasell with the grade designation Toppyl RC3000. The olefinic specialty elastomer tested was manufactured by ExxonMobil under the trade designation Vistamaxx 6102FL.
[0145] The polybutene-1 resin layer provided the following values: 30 μm thickness yielded 6.25 lbf / in initial peel force and 1.2 lbf / in reopen peel force; 25 μm thickness yielded 7.06 lbf / in initial peel force and 1.28 lbf force / inch reopening peel force; 20 μm thickness yields 5.32 lbf / in initial peel force and 1.33 lbf / in reopen peel force; 15 μm thickness yields 4.35 lbf / in initial peel force a...
Embodiment 3
[0149] In a first example, a coextruded film 82 was tested in which the inner film layer 86 was also non-polar and was one of: low density polyethylene (LDPE), high density polyethylene (HDPE), linear low Density polyethylene (LLDPE) or their blends. An example of an LDPE resin tested is NOVAPOLL LF-0222-F from Nova Chemicals. An example of a tested HDPE is Marflex 9656 from Chevron Phillips. The LLDPE tested was Dowlex 2045G from Dow Chemical. The adhesive layer was 100% polybutene-1 or 100% Vistamaxx or blends thereof in different proportions. It was found that the bond strength between the adhesive layer and the polyethylene based inner layer holding them together was so strong that the force required to separate was too great and the layers did not detach satisfactorily. It was found that only in the sealing area (where the films were sealed together or to another structure) did the film and adhesive layer delaminate from each other exposing the adhesive layer and allow...
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