Abstract:
PURPOSE: A device for continuously extruding a polymer resin is provided to extrude at or below the transition temperature of the polymer resin and to enable the extrusion of a molten polymer resin with high viscosity. CONSTITUTION: A device for continuously extruding a polymer resin comprises an extruder(100) and an extrusion die(200). In the extrusion die, continuous extrusion is possible at Tm-60 deg. C-Tm+300 deg. C(melting temperature of crystalline polymer: Tm) and at Tg-10 deg. C-Tg+350 deg. C(glass transition temperature of amorphous polymer: Tg). A lubricant injected through an oil injecting hole formed on the extrusion die coats a surface of a molten polymer resin which flows in an extrusion path. The viscosity of the lubricant is lower than the molten polymer resin and is removed after completing the shaping of an extrusion molding object. [Reference numerals] (AA) Oil injection position
Abstract:
본 발명은 닫힌셀(closed cell)이 형성된 폴리올레핀 수지 발포체 및 그 제조방법에 관한 것으로, a) 폴리올레핀계수지 및 핵제를 포함하는 수지조성물을 압출기에 투입하는 단계; b) 상기 압출기의 배럴에 물리적 발포제로 초임계유체를 주입하여 수지조성물과 초임계유체를 혼합하면서 용융혼련하는 단계; c) 상기 초임계유체가 혼합된 혼련물을 다이로 이송하며, 상기 혼련물의 온도가 다이 부근에서 하기 식 1의 온도범위가 되도록 조절하고, 상기 다이의 내부에 유기코팅제를 주입시켜 상기 폴리올레핀계수지의 용융온도(T m )보다 낮은 온도의 압출물 표면을 코팅하면서 다이로부터 압출하여 발포체를 제조하는 단계; [식 1] T m -35℃ ≤ P T ≤ T m +5℃(상기 식 1에서 P T 는 다이에서의 고분자 수지의 온도이며, T m 은 폴리올레핀계수지의 용융온도를 의미한다.)를 포함하여 수지의 용융온도보다 낮은 온도에서 발포하여 닫힌셀의 발포체를 제조하는 폴리올레핀계 수지 발포체의 연속 제조방법에 관한 것이다.
Abstract:
본 발명은 인조목재 복합재에 관한 것으로, a) 10 ~ 50메쉬의 입자크기를 갖으며, 함수율이 4% 이하인 목분, 말레익언하이드라이드, 테트라 하이드로 프탈릭언하이드라이드 선택되는 1종 이상의 커플링제, 개시제 및 비닐벤젠 또는 메타크릴산을 첨가하여 교반하면서 목분의 표면을 처리하는 단계; b) 상기 표면 처리된 목분 50 ~ 80 중량%, 폴리올레핀계수지 10 ~ 45 중량%, 무수말레인산 변성 폴리프로필렌 또는 그 유도체 1 ~ 10 중량%를 혼합하는 단계; 및 c) 상기 혼합물을 압출기 호퍼에 투입하여 압출기내에서 가압 혼련한 후, 다이에서 복합재로 성형하는 단계; 를 포함하는 인조목재 복합재의 제조방법에 관한 것이다. 목분, 올리핀계수지, 복합재, 무수말레산 변성 폴리프로필렌
Abstract:
PURPOSE: A manufacturing method a polyolefin bead foam and a manufacturing method of a foamed mold using thereof are provided to secure the compressive strength, the recovery rate, and elastic force of a bead foam, and to reuse the foam without melting or expanding. CONSTITUTION: A manufacturing method of a foamed mold comprises the following steps; drying polypropylene copolymers with two melting points produced by a spherizone process; producing beads by foaming the dried polypropylene copolymers using a continuous extrusion foaming process; and molding the beads inside a mold. The difference between two melting points of the polypropylene copolymers is 4~12 deg C. The molding process is operated in the temperature between two melting points at the pressure of 2~5.
Abstract:
A composition for preparing a thin film foam, a method for preparing a thin film foam by using the composition, and a thin film foam prepared by the method are provided to improve mechanical strength, storage stability, durability and the feeling of touch. A composition for preparing a thin film foam comprises 10-80 wt% of a polyolefin containing an unsaturated group, its copolymer or its mixture; 0.01-5 wt% of a crosslinking agent; 5-80 wt% of a water-soluble filler; 5-80 wt% of an oil; and optionally 0.01-5 wt% of a reactive monomer. Preferably the reactive monomer is selected from a monomer containing a vinyl group, an allyl group, a (meth)acrylate group or their mixture; and the water-soluble filler is salt.
Abstract:
본 발명은 기계적 강도가 우수한 박막 발포체를 제공하는 것으로 폴리올레핀과 수가용성 무기필러 및 가교제를 혼합하여 압출, 칼렌터링 또는 프레스몰딩에 의하여 필름을 제조한 후, 자외선 또는 전자선 경화에 의해 필름을 가교한후, 냉각, 무기필러 추출 및 건조하여 다공성 필름을 제조하여 기계적 강도가 우수하고, 다공체의 회복율이 우수한 새로운 박막 발포체를 제공한다. 폴리에틸렌, 발포, 가교, 박막
Abstract:
PURPOSE: A polymer resin extruding device and a processed product manufactured using the same are provided to extrude a material with high viscosity at a low pressure. CONSTITUTION: A polymer resin extruding device comprises a hopper(30), a screw(20), and a die(50). The hopper supplies a melted resin. The screw pressurizes the melted resin. The melted resin molded from the screw is discharged in the die. An oil supply pipe(56) is formed on one side of the die. The oil is organic oil or inorganic oil and is transmitted by force with a pump to an extruder.
Abstract:
PURPOSE: A continuous extrusion method of a polymer resin composite is provided to reduce an extrusion pressure and to improve an extrusion rate by coating oil between metal surfaces inside a melted polymer composite and a die. CONSTITUTION: A continuous extrusion method of a polymer resin composite comprises the following steps. Wood dust and a polymer resin are injected to an extruder. A polymer composite melt is transferred to a die while melting the mixture. Then, coating oil is injected into the die to manufacture a mold product by pressing the polymer composite melt from the die while coating the surface of the polymer composite melt. The mixture of the first step further comprises one selected from a foaming agent, a zinc oxide, stearic acid, talc, and a mixture thereof as an additive. The viscosity of the coating oil is 500 PaS or less. The coating oil is one selected from water, silicon oil, ethylene glycol, canola oil, oligomer, synthetic oil, and a mixture thereof.