低壓灌注是適用于快速成型廠家的一項手板制作工藝，它將聚氨酯材料經混合后，在常溫、低壓環境下注入快速模具內，通過材料的聚合、交聯、固化等化學和物理過程形成制品。低壓灌注適用于產品開發過程中的小批量制作，以及結構較簡單的覆蓋件和大型厚壁及不均勻壁厚制品的生產。

Low pressure injection is a prototype manufacturing process suitable for rapid prototyping manufacturers. It mixes polyurethane materials and injects them into rapid molds at room temperature and low pressure, forming products through chemical and physical processes such as material polymerization, cross-linking, and curing. Low pressure injection is suitable for small batch production in the product development process, as well as the production of structurally simple coverings and large thick and uneven wall thickness products.

低壓灌注利用汽車手板原型制作簡易模具，這種工藝制作的制件可以大到汽車保險杠與醫療臺車大小的制品，適用數量適合在15-2000套之間。在汽車RIM低壓灌注領域，比如保險杠、翼子板、方向盤、、儀表板、進氣格柵、門板、 前端模塊、氣囊蓋等汽車內外飾，思駿達手板廠積累了大量生產心得與技術方法。

Low pressure injection utilizes automotive prototype production to create simple molds. This process can produce products as large as car bumpers and medical carts, with a suitable quantity ranging from 15-2000 sets. In the field of automotive RIM low-pressure injection, such as bumpers, fenders, steering wheels, instrument panels, air intake grilles, door panels, front end modules, airbag covers, and other automotive interior and exterior decorations, Sijunda Hand Panel Factory has accumulated a large amount of production experience and technical methods.

低壓灌注工藝流程：單體或預聚物以液體狀態經計量泵以一定的配比進入混合頭進行混合。混合物注入模具后，在模具內快速反應并交聯固化，脫模后即為RIM制品。

Low pressure infusion process flow: Monomers or prepolymers enter the mixing head in a liquid state through a metering pump in a certain proportion for mixing. After the mixture is injected into the mold, it quickly reacts and crosslinks within the mold, and after demolding, it becomes the RIM product.

低壓灌注成型具有如下特點：

Low pressure injection molding has the following characteristics:

低壓灌注成型過程過程不僅由動力學和熱力學所決定，也受物理條件影響；

The process of low-pressure injection molding is not only determined by dynamics and thermodynamics, but also influenced by physical conditions;

材料固化時間較長，且材料的固化和冷卻占用了絕大部分時間；

The curing time of the material is relatively long, and the curing and cooling of the material occupy the vast majority of the time;

成型后的材料具有熱固性性質；

The formed material has thermosetting properties;

加工在低壓下進行，因此僅適用于產品結構較簡單的快速成型。

The processing is carried out under low pressure, so it is only suitable for rapid prototyping with simpler product structures.

低壓灌注成型使用的材料主要以聚氨酯材料為主，通過改變材料的混合比例，可獲得不同的材料彈性模量，從而得到所需要的材料特性。固化后的材料物理性能類似于ABS、PP或PS。此工藝適合于較大壁厚及不均勻壁厚手板產品的生產。

The materials used in low-pressure injection molding are mainly polyurethane materials. By changing the mixing ratio of the materials, different material elastic moduli can be obtained to obtain the required material properties. The physical properties of the cured material are similar to ABS, PP, or PS. This process is suitable for the production of hand board products with larger wall thickness and uneven wall thickness.