A mold is an essential foundation for forming thin plastic sheets, and only by using a mold can vacuum molded products be produced.

If the mold is not done properly, it means that the plastic products produced later are "long" and crooked.

Someone asked: What mold is good for vacuum packaging production? So, Nobel will explain to you:

What are the main categories of vacuum packaging production molds?

The molds are mainly divided into wooden molds, gypsum molds, copper molds, and aluminum molds.

1. Wooden mold: The mold is made of substitute wood and processed by a carving machine. It has low cost and fast mold opening speed, and is generally used for sample molds of vacuum pallets. However, the transparency of the samples is not high, and the mold is prone to deformation.

Wooden mold

2. Gypsum mold: The advantage is that the production cycle is short, the cost is low, and it only takes one to two days to make a complete (60110cm) mold; The shortcomings lie in the rough surface of the vacuum molded product, the easy breakage of the mold during production, poor durability, and the inability to form products with large depth, high complexity, and thick sheet materials.

The production of gypsum molds involves carving and shaping gypsum in a semi wet state, and then drying it to form the mold.

Gypsum mold

3. Copper mold: The process of electroplating copper mold is to spray a layer of conductive agent on the surface of the pre made bubble shell, and then put it into an electrolytic cell to deposit a thick copper layer. The electroplating process takes 72 hours, and then the copper mold needs to be filled with gypsum. The purpose of filling gypsum is to increase hardness, followed by polishing and air hole treatment.

The production cost of electroplated copper molds is moderate and they have strong durability. The surface of vacuum molded products produced with them will be relatively smooth, but due to their long production cycle, they cannot complete the production of precision vacuum molded products.

Non curved samples of copper/gypsum molds

4. Aluminum mold: Aluminum mold production is made using computer design drawings and CNC milling machines. Its production cycle is moderate, and the later mold processing time is short. Its drilling air hole work needs to be completed during CNC processing. Its durability is strong, and the size accuracy of the vacuum molded products produced with it is high, but the cost is relatively high.

Samples made from aluminum molds

Finally, in terms of price, aluminum molds> Copper mold; Wooden formwork; Gypsum mold.

Gypsum molds are usually used to make samples for customers, but their characteristics determine that they cannot be used as mass production molds.

For vacuum packaging with low requirements for curves, copper molds can be used.

Aluminum molds are the preferred choice for large-scale and high demand vacuum molding production, with advantages such as durability, high efficiency, and extremely low scrap rate.

Paper plastic machine/vacuum packaging machine