Production method of polypropylene sheet
OwnerTakeshi NAKAJIMA, Masayuki IKEDA +1inventors
InventorsTakeshi NAKAJIMA, Masayuki IKEDA, Akihiro KATAGIRI
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Abstract
A method for producing a polypropylene sheet having a thickness of 0.5 to 5 mm, the method comprising; a step 1 of preparing a precursor in which a first biaxially oriented polypropylene film having a thickness of less than 0.15 mm and a melting point Tmh and a second biaxially oriented polypropylene film having a thickness of less than 0.15 mm and a melting point of Tml are alternately laminated; a step 2 of bringing a heating element into contact with an outermost layer of the precursor to thermally seal layer of the films, where Tmh−Tml≥8(° C.) where the melting point is measured by a differential scanning calorimeter (DSC) under the condition at 30° C. to 230° C. and a heating rate of 10° C./min.
Claims15
A method for producing a polypropylene sheet having a thickness of 0.5 to 5 mm, the method comprising;
- a step 1 of preparing a precursor in which a first biaxially oriented polypropylene film Fl having a thickness of less than 0.15 mm and a melting point Tmh and a second biaxially oriented polypropylene film F2 having a thickness of less than 0.15 mm and a melting point of Tml that can be laminated;
- and
- a step 2 of bringing a heating element into contact with an outermost layer of the precursor to thermally seal each of the layers of the films,
- wherein Tmh−Tml≥8(° C.) where Tmh and Tml the melting point is measured by a differential scanning calorimeter (DSC) under the condition at 30° C. to 230° C. and a heating rate of 10° C./min, and wherein the precursor provides the polypropylene sheet in which the first biaxially oriented polypropylene film F1 and the second biaxially oriented polypropylene film F2 can be alternately laminated with each other in step 2.
A method for producing a polypropylene sheet having a thickness of 0.5 to 5 mm, by laminating biaxially oriented polypropylene films having different melting points and by thermally sealing layers of the films, the method comprising;
- a step 1 of preparing a precursor in which a first biaxially oriented polypropylene film F1 and a second biaxially oriented polypropylene film F2 are alternately laminated, the precursor including a plurality of the films, wherein
- the first biaxially oriented polypropylene film has a thickness of less than 0.15 mm and a melting point Tmh, and
- the second biaxially oriented polypropylene film has a thickness of less than 0.15 mm and a melting point of Tml;
- and
- a step 2 of bringing a heating element into contact with an outermost layer of the precursor to thermally seal the layers of the films, wherein
- Tmh−Tml≥8(° C.)
- where the melting point is measured by a differential scanning calorimeter (DSC) under the condition at 30° C. to 230° C. and a heating rate of 10° C./min.
Dependencies are inferred from the claim text.