The production of disposable fast tableware by pulp molding has a relatively simple shape and a certain versatility because the products only have boxes, bowls and plates. When pulp molding is used in industrial inner packaging and other aspects, the products are relatively large, the shape is very complex, and one is a "number seat", there is no universality, and the mold design and manufacturing must be accompanied by always. How much do you know about pulp molding molds? Decrypt it with IPFM.
01
Classification of
pulp molding molds
●Adsorption molding mold
The structure of the adsorption forming mold is composed of punch, concave mold, screen mold, mold base, mold back cavity and air chamber. The screen mold is the main body of the mold, because the screen mold is woven by 0.15mm diameter silk wire (metal or plastic), it cannot be formed independently, and must be attached to the surface of the mold to work.
The back cavity of the mold is a cavity composed of the back part of the mold relative to the mold seat that maintains a certain thickness and shape completely synchronized with the mold working surface, that is, the convex and concave mold is a shell with a certain wall thickness. The working surface of the mold and the back cavity are connected by small holes evenly distributed. The mold is installed on the template of the forming machine through the mold base, and the other side of the template is provided with an air chamber, and the air chamber communicates with the back cavity, and there are two channels for compressed air and vacuum on it.
●Shaping mold
The structure of the shaping die comprises punch, concave die, mesh die and heating element, there is a drainage exhaust hole on the convex or concave die attached to the screen die, the wet paper blank is first extruded in the shaping die during work, and 20% of the water is pressed and discharged, and the water content in the wet paper blank is 50-55% at this time, so that the remaining water after the wet paper blank is heated in the mold is vaporized and eliminated, and the wet paper blank is pressed and dried to form a product after shaping.
Pulp molding mold design
Pulp molding mold design is not only the design of structural equipment and equipment, many properties of its products are determined by raw materials, additives, fillers and production processes. Therefore,
pulp molding mold design is a comprehensive technology of process and structure.
●Functional structure
In order to meet the functional requirements, the shape cavity and vertical rib can be used when adjusting the strength and cushioning, the mold cavity can increase the elasticity and flexibility of the product as a whole, and the vertical bar can increase the strength and rigidity of the product. In a relatively large plane, when the bearing capacity is high, it can be designed as corrugated or honeycomb.
●Manufacturable structure
Because the pulp molded products are a wet paper blank in the early stage of forming, in the production process, the water should be gradually precipitated, and the shape, position and size of the product will change greatly. In order to adjust this deformation, the only way to balance it is to take the shape of the structure. This structural shape used to adjust shrinkage deformation is called the process structure of the product.
●Principles for determining parameters related to the structure
Demoulding slope, pulp molded products in the forming process, wet paper blank tightly linked to the mold, and pulp fiber will also be embedded in the mesh of the mesh mold, in order to facilitate the transfer of wet paper blank, and the demolding direction parallel to the surface of the product should have a reasonable demoulding slope. If the inclination is too small, it will be difficult to demould, which will cause the surface of the product to be stretched or cracked; If the slope is too large, the system will be lowered
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