Preparation method of multilayer online gluing type PVC plate

Abstract

The invention discloses a preparation method of a multilayer online gluing type PVC plate. The preparation method of the multilayer online gluing type PVC plate comprises the following steps that rawmaterials of a lower PVC layer are added into a first extrusion device, and the raw materials are heated and extruded; raw materials of a middle PVC layer are added into a second extrusion device, andare heated and extruded onto the lower PVC layer; glass fiber cloth or non-woven fabric is laid on the middle PVC layer, and are heated and rolled; and raw materials of the upper PVC layer are addedinto a third extrusion device, heated and extruded onto the middle PVC layer, and heated and rolled to form a multi-layer structure of the upper PVC layer, the glass fiber cloth or the non-woven fabric, the middle PVC layer and the lower PVC layer. According to the preparation method, the PVC layers are divided into three layers with different stone powder content, the middle PVC layer is large inthickness, high in stone powder content, and can reduce the cost of a plate, the PVC content of the middle PVC layer is low, the PVC layers are not prone to being influenced by thermal expansion andcold contraction, the upper PVC layer and the lower PVC layer are high in PVC content and strong in elasticity, and a reinforcing layer can be embedded into the PVC layers, so that the PVC layers arecombined into a whole, and plate warping is prevented.

Description

technical field [0001] The invention relates to a preparation method of a multi-layer on-line laminated stone-plastic board. Background technique [0002] As a new type of board, stone-plastic board has the following advantages: the raw material is environmentally friendly, and the formaldehyde emission is zero; the material is light and thin, and has super wear resistance, high elasticity and super impact resistance; Waterproof, noise-proof performance, construction and installation are also very convenient. Therefore, stone-plastic panels can be used as floors, wall panels, furniture panels, wall lines, etc., and its application range is becoming wider and wider. Moreover, the stone-plastic board can be recycled and reused, which has great advantages in cost reduction and environmental protection. [0003] There is a very serious problem with stone-plastic panels, that is, when they are subjected to relatively large changes in cold and heat, their expansion and shrinkage...

AI Technical Summary

Problems solved by technology

However, the co-extrusion method will cause the following problems: 1. The extruded resin seems to be layered, but it is extruded from a mold and formed at one time. In fact, it is still a resin sheet, but the materials of the upper, middle and lower layers of the resin may have Different, in this case, the internal stress of the resin sheet is relatively large, especially when the materials of the upper, middle and lower layers are different, it will lead to an increase in the internal stress of the resin sheet, which will affect the mechanical properties and flatness of the resin sheet 2. Co-extrusion will waste the production capacity of the extruder. If the resin is divided into upper and lower layers in the method of CN107031136A, two extruders are required to carry out co-extrusion, but its comprehensive production capacity is only 120-125% of one extruder about

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