Organic-resin-coated metal sheet, process for producing same, metallic can obtained by processing said organic-resin-coated metal sheet, and can lid
A technology of organic resin and metal plate, applied in the direction of metal layered products, chemical instruments and methods, synthetic resin layered products, etc., can solve the problems of cooking whitening and other problems, achieve the prevention of cooking whitening, excellent effect, and inhibit cooking whitening. Effect
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Embodiment 1
[0162] In Example 1, an organic resin-coated metal plate was produced as follows, and the recrystallization peak temperature (Tc) and recrystallization peak height (H) were measured.
[0163] In addition, the organic resin-coated metal sheet for the can body is made into a metal can by the drawing-shrinking method, and the can lid is made of the organic resin-coated metal sheet for the can lid. and the state of delamination of the flange portion of the can body were evaluated.
[0164] (Metal plate)
[0165] As the metal plate for the can body, a JISA3004PH19 material and an Al—Mn-based aluminum alloy plate with a plate thickness of 0.3 mm were used.
[0166] As the metal sheet for can ends, a surface-treated cold-rolled steel sheet (TFS) with a thickness of 0.25 mm was used which was subjected to electrolytic chromic acid treatment.
[0167] (polyester resin composition)
[0168] As a polyethylene terephthalate-type resin, 12 mol% of polyester components were isophthalic a...
Embodiment 2
[0258] As the polyester-based resin composition, crystalline polyester (II) having an intrinsic viscosity (IV) of 0.69 was used, and 20 wt % of crystalline polyester (II) was blended.
[0259] Also, kneading was performed at a low kneading degree with Q / N: 1.6 and a residence time in the extruder of 5 minutes.
[0260] In addition, an organic resin-coated metal plate was produced in the same manner as in Comparative Example 1, and the recrystallization peak was measured, and a seamless two-piece metal can and a can lid were produced, and film burrs and film cutting conditions during masking and can body trimming were observed. Abrasion of the can body, delamination of the flange processing part, appearance of the side wall of the can body, and whether cooking whitening occurs.
[0261]Table 1 shows the film physical properties (film thickness, recrystallization peak) measurement results of the unstretched film using the polyester resin composition of Example 2.
[0262] Evalu...
Embodiment 3
[0268] Except for using crystalline polyester (II) with an intrinsic viscosity (IV) of 0.87 as the polyester-based resin composition, an organic resin-coated metal plate was produced in the same manner as in Example 2, and the recrystallization peak was measured, and seamless 2 Sheet metal cans and can lids, observe the burrs of the film and the cutting condition of the film during masking and can body trimming, the wear of the can body, the peeling of the flange processing part, the appearance of the side wall of the can body, and whether cooking whitening occurs.
[0269] Table 1 shows the film physical properties (film thickness, recrystallization peak) measurement results of the unstretched film using the polyester resin composition of Example 3.
[0270] Evaluation results and comprehensive evaluations of film burrs and film cuts during masking and can body trimming, can body wear, delamination of the flanged portion, appearance of the side wall of the can body, and cookin...
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Abstract
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