Tips for post-treatment of photo cured resin

When using photosensitive resin to print models, we often encounter this problem where the printed model is prone to cracking. Taking this step seriously can greatly improve the quality of the model.

As we all know, after the photosensitive resin model is printed, there will be a post curing process. This process may seem simple, but if it is not done well, the quality of the model will be greatly damaged.

What we are sharing with you in this issue is why my model is printed but easily broken? The main reason is that the printed model was not properly processed during solidification

So how should post curing be done?

First, place the model in cold water and then place it under a high-power ultraviolet lamp for secondary curing

be careful:

1. The higher the power of the post curing equipment used, the shorter the required time. Generally, for a 600W full band ultraviolet lamp, it is recommended that the post curing time for each side be between 10s and 30s

2. When performing post curing operations, it is necessary to ensure that each surface can be uniformly exposed to ultraviolet radiation, otherwise the model is prone to stress concentration and cracking

Here's a little trick, why do we need to put it in cold water during secondary curing?

The benefits of post curing in cold water:

1. Resolve some model sticking issues.

Water can reduce the contact between the model and air, thereby avoiding the occurrence of oxygen blocking, so that the solidified model will not stick to hands, and some materials printed on the model surface have better scratch resistance.

2. Resolve the deformation issue of some models after solidification.

During post curing, the resin material undergoes further chemical reactions, releasing heat. At the same time, high-power ultraviolet lamps also release heat. For a 600W ultraviolet lamp, the short-term temperature can reach 60 ° C~70 ° C, while most LCD materials have a thermal deformation temperature of about 50 ° C~60 ° C during printing, making the material prone to deformation. Placing the model in cold water can greatly reduce the impact of temperature on the model, thereby improving its dimensional stability.