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Thermoplastic multilayer resin sheet and molded container
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A resin sheet and thermoplastic technology, applied in the field of forming containers, can solve the problems of insufficient slit breakability and reduced container drop strength, and achieve the effect of excellent slit breakability and sufficient slit breakability
Active Publication Date: 2017-03-01
DENKA CO LTD
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Problems solved by technology
[0004] In the above-mentioned conventional container, a 15 to 20% reduction in weight can be achieved by providing a foam layer inside, but on the other hand, there is a problem that the drop strength of the container is greatly reduced compared with a sheet without a foam layer.
In addition, in the case of a resin sheet in which a notch is formed from one side, there is a problem that the notch breakability after thermoforming is insufficient.
Method used
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Embodiment 1
[0080]Using 4 sets of 40mm single-screw extruders, through the feed block method, a solid layer (outside the roll) 80μm / adhesive layer (outside the roll) 5μm / strength maintaining layer 30μm / adhesion layer (inside the roll) 5μm / foam A thermoplastic multilayer resin sheet with a total thickness of 750 μm (thickness 120 μm on the side with the strength maintaining layer bordering the foam layer) composed of layers of 390 μm / solid layer (in-roll) 240 μm.
[0081] It should be noted that, as the styrene-based resin, a HIPS resin was used for the solid layer, and a resin obtained by mixing a HIPS resin and a GPPS resin at a mass ratio of 50 / 50 (HIPS / GPPS) (butadiene component content) was used for the foam layer. 4.7% by mass).
[0082] In addition, the addition amount of the foaming agent with respect to the resin amount of the foamed layer was 0.7 PHR.
[0083] Under the following conditions, the thermoplastic multilayer resin sheet was subjected to molding, slit formation, conta...
Embodiment 1～13、 comparative example 1～4
[0113] Except for changing the presence or absence of the strength maintaining layer and the adhesive layer, the resin composition of the strength maintaining layer, the amount of foaming agent added to the resin amount of the foamed layer, and the thickness of each layer as shown in Tables 1 and 2 , and the thermoplastic multilayer resin sheet was molded in the same manner as in Example 1.
[0114] In addition, a container was molded in the same manner as in Example 1 using the obtained thermoplastic multilayer resin sheet.
[0115] The evaluation results are shown in Table 1 and Table 2.
[0116] [Table 1]
[0117]
[0118] [Table 2]
[0119]
[0120] As can be seen from Tables 1 and 2, the containers formed using the multilayer resin sheets of the examples of the present invention were sufficiently good in both the container drop strength and the container notch breakability, while the containers formed using the resin sheets of the comparative examples were good en...
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Abstract
[Problem] To provide a thermoplastic multilayered resin sheet which combines lightweight properties with strength and which can have sufficient notch snappability after thermoforming and a molded container produced using the resin sheet. [Solution] A thermoplastic multilayered resin sheet which comprises a foam layer and solid layers formed respectively on both sides thereof and in which notches are to be formed in one surface of the sheet, wherein a reinforcing layer constituted of a polyolefin resin has been disposed between the solid layer that constitutes the surface to be notched and the foam layer, and the thickness of the notch-formation-side layers including the reinforcing layer and ranging to the boundary of the foam layer is 25% or less of the overall thickness.
Description
technical field [0001] The present invention relates to a thermoplastic multilayer resin sheet and a molded container formed by molding the same. Background technique [0002] Heretofore, styrene-based resins having excellent moldability have been used in dairy product containers typified by yogurt and milk portions. In recent years, a styrene-based foamed sheet of a multilayer structure in which each layer has properties such as gas barrier properties against oxygen and moisture resistance has been developed (see Patent Document 1). [0003] Furthermore, in recent years, there is a social trend to reduce waste in order to reduce the environmental load, and accordingly, a technique for reducing weight by arranging a foam layer inside a sheet is planned (see Patent Document 2). [0004] In the above-mentioned conventional container, the weight reduction of 15 to 20% can be achieved by providing the foam layer inside the container, but on the other hand, compared with the she...
Claims
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Application Information
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