The Process of Pulp Molding and It Advantages

Release time: 2023-05-27    Time visited:333

The concept of mold pulp: 

Pulp molding as a 3D paper making technology, with a large number of plant fibers as raw materials, such as bagasse, bamboo pulp, etc., according to different color needs, usually choose different pulps. The color of pulp molded finished products can be roughly divided into white and bamboo natural color, these two colors are the raw materials, without dyeing. The finished product shape is natural, the texture is 100% fully biodegradable, and the production and use process will not cause any pollution to the environment.

Pulp molding production process: 

Generallymold manufacturing material is steel or aluminum, the center of pulp molding products lies in the mold, including forming mold, transfer mold, heat setting mold, etc., usually the mold fineness of wet pressing products is much higher than dry pressing products, the cost will be relatively higher, the production time of sample molds is about 7 days, and the bulk mold is 20 days.


The raw materials (sugarcane bagasse, bamboo, etc.) are poured into the pulp pool or pulp barrel, mixed with clean water, and the pulping machine is used to form a pulp by controlling a certain pH value and concentration, and the general dyeing is also completed in this link.


The prepared pulping is transferred to the forming mold through the pulp suction system to form a wet mold base. At this time the mold base has no hardness and contains a lot of water, but the basic prototype of the product has been formed.

Heat setting 

The wet mold base formed on the mold, in the heat setting link through electric heating evaporation of 98% of the water, so that the product has better toughness and strength, the time of water evaporation is the demolding time. According to the product accuracy and smoothness requirements, the demolding time is generally in the 120s-180s.


The product formed by heat setting still has burr edges around it, and the finished product is made more refined by the cutting process. The cutting edge is generally divided into flat cutting and revolve cutting. The flat cut out of the product will have a little edge, and the revolve cutting can directly cut all the edges, and different cutting methods can be selected according to the needs of the product.


Bonding can also become a composite process, in order to strengthen the strength, usually choose the way of compounding, the two pieces of mold pulp parts bonded together, in addition to better hardness, the delicate degree of packaging is also higher than the packaging of a single piece.


The foil stamping, silk screen printing, UV printing, etc.that can be used in traditional packaging can also be applied to pulp molding packaging, and can give pulp molding packaging stronger symbol characteristics by combining various post-processing processes.

Quality inspection / Cartoning 

All finished products will be fully inspected and correspondingly tested before final packing and transportation, including transportation vibration test, drop test, high and low temperature test, etc., to ensure that the shipment yield reaches the best.

Advantages of mold pulp: 

First of all, pulp molding is mainly biodegradable, compostable properties, different from the common recyclable. This material will automatically degrade after being thrown into the natural environment, and then converted into nutrients for various plants, truly taking from nature and returning to nature. However, recyclable is the main feature of the material itself can be used many times, such as common environmentally friendly plastics on the market, this type of material itself does not have the characteristics of being absorbed by the soil, which after being discarded requires a lot of time to decompose. The decomposition time of mold pulp packaging is only 90 days!

Secondly, due to its one-piece molding characteristics, pulp molding packaging often has more choices in packaging shape. In addition to the common square gift box shape on the market, heart-shaped, round, pentagonal and other special-shape can also be easily achieved through mold pulp packaging. It is precisely because of this characteristic that the cumbersome production process of traditional gift boxes is reduced, and degradable packaging has achieved truly fully automated production. At present, major brands domestic and abroad are leading the use of pulp molded packaging. In addition to its environmental protection and degradable advantages, this packaging can give products high-end differentiated attributes.

About mold pulp degradable certification: 

At present, the industry's recognized degradation reports in addition to the common SGS reports, there are also ASTM in the United States, OK COMPOST in Europe, etc., ASTM is more biased towards industrial compostable, and OK COMPOST emphasizes more on the home compostable properties of materials, it can be said that OK COMPOST's degradable standards are basically the highest standards in the industry. At the same time, in order to allow pulp molded packaging to directly contact food, some manufacturers will also apply for BRC reports. However, the FSC certification applicable to traditional packaging does not apply to pulp molding packaging. The FSC mainly controls wood, while the main raw material of paper and plastic is bagasse. There is no direct relationship between the two.

Well-known enterprises are using pulp molding eco-friendly packaging 

Pulp molding has been loved by the market because of its degradable, recyclable, recyclable and other high-quality characteristics. Tencent, Yanzhiya, Huawei, Starbucks and other large companies are using this new environmentally friendly packaging material, According to statistics, every 100,000 boxes of pulp molded packaging box can cut down 302.8 trees. In the global environment is constantly harsh today, low-carbon and environmentally friendly packaging is the future of the global environment. Nowlet's design a beautiful eco-friendly packaging box for your products!