METHOD OF PRODUCING COMPOSITE MOLDED ARTICLE

• Main Authors: SONODA NAOAKI, OKUYAMA YUJI, OKAI HIROAKI
• Format: Patent
• Language: English; Japanese
• Published: 18.06.2020
• Subjects: AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING; LAYERED PRODUCTS; LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT ORNON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM; PERFORMING OPERATIONS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDEDFOR; SHAPING OR JOINING OF PLASTICS; TRANSPORTING; WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE, IN GENERAL

To provide a method of producing a composite molded article capable of realizing good surface properties and size stability.SOLUTION: A method of this invention is for producing a composite molded article including a core part containing resin foam and surface layer parts containing fiber-reinforced resin and sandwiching the core part. The production method includes steps of: stacking raw materials of the core part and the surface parts; and heat pressing the raw materials at a predetermined strain value of the stress-strain curve representing a relation between strain of the core part and compression stress at a molding temperature of the composite molded article to obtain the composite molded article. The predetermined strain value is, within a strain range where a difference between the maximal value and the minimal value of strain of the stress-strain curve is 20%, a strain value such that a ratio of the maximal value and the minimal value of the compression stress with respect to a compression stress value at a median value of strain falls into ±15% of the stress ratio range.SELECTED DRAWING: Figure 1 【課題】優れた表面性と寸法安定性とを実現し得る複合成形品の製造方法を提供する。【解決手段】発泡樹脂を含有する芯部と、繊維強化樹脂を含有し、芯部を挟む表層部と、を備えた複合成形品の製造方法である。この製造方法は、芯部と表層部の原料とを積層し、複合成形品の成形温度での芯部の歪みと圧縮応力との関係を示す応力−歪み曲線の所定歪値で加熱加圧し、複合成形品を得る工程を有する。この所定歪値は、応力−歪み曲線の歪みの最大値と最小値との差が２０％である歪み範囲内において、歪みの中央値における圧縮応力の値に対する圧縮応力の最大値及び最小値の比率が±１５％の応力比率範囲内となる歪値である。【選択図】図１