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路沿石是在路面上区分车行道、人行道、绿地、隔离带和道路其他部分的界线，起到保障行人、车辆交通安全和保证路面边缘整齐的作用路沿石主要是道路两侧长条形水泥预制块或石材切割而成，路沿石模具主要是以生产预制混凝土路沿石为主，模具的材质一般分为塑料注塑成型还有钣金钢模具成型，生产原理是将混凝土倒入塑料模具或铁模具内，等水泥凝固后在拆模或者脱模成型，路沿石塑料模具主要采用工程聚丙PP注塑成型，材质直接影响模具的使用寿命。
The roadside stone is the boundary line that distinguishes the roadway, sidewalk, green space, isolation zone and other parts of the road on the road surface. It plays the role of ensuring the safety of pedestrians, vehicles and the neatness of the road edge. The roadside stone is mainly cut by long strip cement precast blocks or stone materials on both sides of the road. The stone mould along the road is mainly used to produce precast concrete roadside stone, and the material of the mould is generally divided into two parts. For plastic injection moulding and sheet metal steel moulding, the principle of production is to pour concrete into plastic or iron moulds, and then demould or demould after cement solidification. Engineering polypropylene PP injection moulding is mainly used for stone moulds along the road. Material directly affects the service life of the moulds.