河道急流槽模具—河道流水槽模具—橋梁急流槽模具越來(lái)越受到人們的廣泛使用，它的用途也越來(lái)越大，急流槽槽模具屬于塑料的一種，他的生產(chǎn)制造各個(gè)環(huán)節(jié)都離不開(kāi)塑料。簡(jiǎn)單了解一下現(xiàn)澆急流槽模具—水泥現(xiàn)澆急流槽模具—現(xiàn)澆流水槽模具—宏旭模具的收縮率。同熱塑性塑料一樣，熱固性塑料經(jīng)成型冷卻后也會(huì)發(fā)生收縮，其收縮率的計(jì)算與熱塑性塑料相同，產(chǎn)生收縮的主要原因有①熱收縮。熱收縮是由于熱脹冷縮而使塑件成型冷卻后所產(chǎn)生的收縮，熱收縮與模具的溫度成正比，是成型收縮中主要的收縮因素之一。②結(jié)構(gòu)變化引起的收縮，熱固性塑料在成型過(guò)程中進(jìn)行了交聯(lián)反應(yīng)，分子由線形網(wǎng)狀結(jié)構(gòu)，由于分子鏈間距的縮小，結(jié)構(gòu)變得緊密，故產(chǎn)生了體積收縮。③彈性恢復(fù)，塑件從模具中取出后，作用在塑件上的壓力消失，由于彈性恢復(fù)，會(huì)造成塑件體積的副收縮，河道急流槽模具—河道流水槽模具—橋梁急流槽模具在成型以玻璃纖維和布質(zhì)為填料的熱固性塑料時(shí)，這種情況尤為明顯。River channel chute mold - river channel chute mold - bridge chute mold is more and more widely used by people, and its use is becoming larger and larger. Chute mold belongs to a kind of plastic, and all links of its production and manufacturing are inseparable from plastic. Simply understand the shrinkage rate of cast-in-situ chute mold - cement cast-in-situ chute mold - cast-in-situ chute mold - Hongxu mold. Like thermoplastics, thermosetting plastics will shrink after molding and cooling. The calculation of shrinkage rate is the same as that of thermoplastics. The main reasons for shrinkage are ① thermal shrinkage. Thermal shrinkage is the shrinkage of plastic parts after forming and cooling due to thermal expansion and cold shrinkage. Thermal shrinkage is directly proportional to the temperature of the mold and is one of the main shrinkage factors in forming shrinkage. ② Shrinkage caused by structural change, thermosetting plastics undergo cross-linking reaction in the molding process. The molecules are in a linear network structure. Due to the reduction of molecular chain spacing, the structure becomes compact, so there is volume shrinkage. ③ Elastic recovery: after the plastic part is taken out of the mold, the pressure acting on the plastic part disappears. Due to elastic recovery, it will cause the secondary shrinkage of the plastic part volume. This situation is particularly obvious when the channel chute mold - channel chute mold - bridge chute mold is used to form thermosetting plastics filled with glass fiber and cloth.