Process for production of void-containing resin moldings and void-containing resin moldings obtained by the process
A resin molded body and a technology for a manufacturing method, which are applied in the field of the manufacture of a resin molded body containing voids and the resin molded body containing voids obtained by the manufacture, can solve the problems of uneven thickness and the like, and achieve excellent thermal insulation properties , the effect of high chroma and brightness
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[0133] The method for producing the polymer molded article is not particularly limited, and can be appropriately selected according to the purpose. For example, when the crystalline polymer is a polyester resin or a polyolefin resin, it can be preferably produced by a melt film-forming method.
[0134] In addition, the preparation of the polymer molded article and the stretching step may be performed independently or continuously.
[0135] figure 1 It is a figure which illustrates an example of the manufacturing method of the cavity-containing resin molded article of this invention, and is a flow chart of the biaxially stretched film manufacturing apparatus. figure 1 The shown biaxially stretched film manufacturing apparatus is a film manufacturing apparatus that performs roll-to-roll stretching.
[0136] Such as figure 1 As shown, the raw material resin (polymer composition) 11 is thermally melted and kneaded inside the extruder 12 (according to the shape of the raw materia...
Embodiment A-1
[0197] Using a melt extruder, extrude PBT1 (manufactured by Polyplastic Co., Ltd., polybutylene terephthalate 100% resin) with IV=0.72 at 245° C. from a T die, pass it through a casting drum at 53° C., and solidify it to obtain A polymer film with a thickness of approximately 120 μm. The polymer film was subjected to uniaxial stretching (longitudinal stretching) on a roll-to-roll basis.
[0198] Specifically, uniaxial stretching was performed at a first-stage peripheral speed of 0.4 m / min and a second-stage peripheral speed of 2.0 m / min in a warming atmosphere at 43°C. The stress-strain (elongation) curve of the polymer film is as follows image 3 shown.
[0199] In addition, the measurement method (calculation method) of the said stress was performed by the method based on JISK7127, and the measurement method of the said deformation|transformation (elongation) was performed by the method based on JISK7127.
[0200] from image 3 It can be seen that the relationship betw...
Embodiment A-2
[0203] A polymer film was produced in the same manner as in Example A-1 except that the stretching conditions in Example A-1 were set to a heating atmosphere of 30°C. The stress-strain (elongation) curve of the polymer film is as follows Figure 4 shown.
[0204] In addition, the measurement method (calculation method) of the said stress was performed by the method based on JISK7127, and the measurement method of the said deformation|transformation (elongation) was performed by the method based on JISK7127.
[0205] from Figure 4 It can be seen that the relationship between the yield stress (A) and the stress at 30% elongation (L30) is L30 / A=0.71.
[0206] By the stretching described above, voids appeared, and a resin film containing voids was obtained.
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Abstract
Description
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