Introduction
Paper pulp molded products possess packaging functions such as product containment, fixation, cushioning, and decoration. Once the raw material composition and production methods are determined, variations in structural form are fundamental to ensuring these packaging capabilities. Structural variations are key to achieving the packaging performance required in design, such as compressive strength, elastic recovery, resistance to external impact, and vibration absorption. Currently, various types of structures for paper pulp molded products have been developed, mainly categorized into single structures, composite structures, folding structures, nesting structures, and heavy-load structures.
Single Structures
Single structure types refer to an individual paper pulp molded product structure, which can be protected by two or more single structures arranged in an upper, lower, left, right, or combined form. Based on the edge structure characteristics, single structure pulp molded products are further divided into edgeless structures, flange structures, etc. Edge structures are very common in the structural design of paper pulp molded products.
Edgeless Structure
The edge refers to the structural part between the outermost periphery of the paper pulp molded product’s structure body and the side wall surface, parallel to the working surface of the molding template. The edge size refers to the width value of this structural part. In the edgeless paper pulp molded product structure form, the actual minimum edge size is less than 2mm.
The edgeless structure’s side buffering effect mainly comes from the selection and processing of the peripheral structure shape in the overall structure. The peripheral structure’s side wall can be inclined or perpendicular to the load direction, and the buffering effect required can be obtained by adjusting this angle.
Flange Structure
In the paper pulp molded product structure with an edge, the edge size is usually 8-15mm. The flange structure is a form where the edge is folded over. The flange structure’s force and buffering effect in the edge direction are related to the edge length and deformable space, suitable for fixation and buffering under the placement method, suitable for light-weight packaging applications.
Composite Structures
Composite structure paper mold products are produced by combining molds of individual or multiple individual structures, or by pasting, laminating, and other composite processes to form a paper pulp molded product. The common form is a combination of two individual paper molds.
Chamber Structure
Chamber structure paper molds are produced using composite molds. The paper mold product is structurally a closed cavity or formed into a small opening container, with the ability to hold items inside, or the entire appearance can be made into artistic creative products.
Dual Structure
Dual structure paper molds are made by pasting and laminating two or more paper mold products through subsequent processing to create a structure with secondary buffering performance. They can also form a “smooth” effect on both sides, with a smooth and flat surface, suitable for lining in consumer electronics.
Folding Structures
Folding structures are essentially single structures that combine flange structures with composite structures to form a single paper pulp molded product. It achieves the effect of composite structures through edge folding (in the form of flanges), and is a specific structure between single and composite structures, saving on pulp usage and avoiding the inconvenience of positioning assembly required in the combination of multiple scattered paper pulp molded products.
Nesting Structures
Nesting structure types are essentially multiple single structures designed as a complete set of packaging according to certain requirements. Not only is the inner lining made of paper pulp molded products, but the entire set can also be combined to form a packaging box or box.
Heavy-Load Structures
Heavy-load structure forms are essentially paper pulp molded products that break through the main packaging objects of light and small products, and become the main application purpose of bearing greater loads. By increasing the mold body thickness or increasing the density of the mold body side wall arrangement, the bearing capacity and overall rigidity required by the structure body are obtained. Heavy-load structure paper pulp molded products are mostly used for heavy product packaging, logistics transportation packaging in the form of assembly packaging, or play a role in fixing in logistics transportation.
