Novel PMMA (polymethyl methacrylate) and PVC (polyvinyl chloride) co-extruded interior trim with metal texture for bus

Abstract

The invention adopts the technical scheme that PMMA and PVC materials are co-extruded and molded through a plastic extruding machine. The production process comprises the following steps: respectively conveying and feeding PVC and PMMA, forcibly feeding, simultaneously extruding by two single-screw extruders, converging and co-extruding by a molding die, processing in a vacuum shaping box, soaking in a cooling water tank, processing in a crawler tractor, processing in a cutter lifting cutting machine, processing in a pipe stacking frame, and detecting and packaging finished products. In combination with the processing characteristics of a PVC material and a PMMA material, the following special design and innovation are carried out in the die design and manufacturing process: two plastic extruding machines are connected together through a connecting rod, so that the problem that a plastic heating pipe cannot resist high temperature is successfully solved. The joint of the PMMA and the PVC is designed to be trumpet-shaped, so that the PMMA can be quickly, uniformly and stably coated on the PVC, namely the appearance surface of a product.

Description

Technical Field

[0001] The present invention relates to the field of bus interior decoration Background Art

[0002] As living standards improve, so do our demands for a higher quality of life. Currently, bus interiors are primarily constructed of extruded parts with roller patterns or aluminum profiles combined with extruded parts. Extruded parts with roller patterns have an uneven surface and are difficult to clean, leading to increasing dirtiness over time. Aluminum profile interiors, however, are difficult to deform during installation, so the moldings covering the nail slots must be extruded. These two materials and processes result in significant color differences, and they are also heavy and expensive, hindering energy conservation, emissions reduction, and consumption reduction. They fail to meet the demands of travelers for a comfortable driving environment, resulting in a poor passenger experience. Summary of the Invention

[0003] In order to overcome the above-mentioned shortcomings, the present invention provides a new interior decoration with metallic texture that is co-extruded from PMMA and PVC for buses.

[0004] To achieve the above object, the present invention is implemented through the following technical solutions: This project uses PMMA+PVC materials to be co-extruded through two extruders. Based on the requirements of the national mandatory safety standards for passenger vehicles, production capacity needs, energy conservation, emission reduction, consumption reduction and cost reduction, two single-screw extruders are selected to use the PMMA+PVC co-extrusion molding process. The technical route is as follows: Production process: (PVC raw material + additive configuration), (PMMA raw material + additive configuration) → mixed with their respective additive configurations → separate conveying and loading → forced feeding → two single-screw extruders extrude simultaneously → forming molds merge and co-extrude → sizing sleeve → spray vacuum setting box → immersion cooling water tank → crawler traction machine → knife lifting and cutting machine → pipe stacking rack → finished product inspection and packaging.

[0005] In order to meet the requirements of this product for beautiful appearance and uniform wall thickness, and to meet the performance requirements of the product not breaking, denting, cracking, deformation, or twisting during vehicle operation, the following special designs and innovations were made in the mold design and manufacturing and product production process, combining the processing characteristics of the single-screw extruder and PVC pellets and PMMA: The two extruders are connected together by a connecting rod, successfully solving the problem that the plastic heating tube cannot withstand high temperatures.

[0006] The junction of PMMA and PVC is designed to be trumpet-shaped, so that PMMA can be quickly, effectively, evenly and stably covered on the PVC, which is the product appearance.

[0007] A 0.5mm step is milled at the junction of PMMA and PVC to facilitate the control of PMMA flow and the thickness of PMMA coverage within 0.3mm, thus maintaining the mechanical properties of PVC.

[0008] Compared with the prior art, the beneficial effects of the present invention are: bright, neat, easy to clean, without losing the metallic texture, unified style, beautiful, scratch-resistant, which greatly improves the riding environment in the bus and makes passengers feel happy. BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 This is a diagram showing the installation of PMMA and PVC co-extruded products. First, fix the base of the lower window gusset, and then install the PMMA and PVC co-extruded parts. Figure 2 This is the extrusion structure diagram of PMMA and PVC co-extrusion. PMMA and PVC are extruded through the connecting rod and the forming die respectively.

Claims

1. A new type of bus interior with a metallic texture made of PMMA and PVC co-extruded, which is characterized by: PVC raw materials, PMMA raw materials, PVC auxiliary agent configuration, PMMA auxiliary agent configuration and single-screw extruder, the PVC raw materials and the PVC auxiliary agent configuration are uniformly mixed, the PMMA raw materials and the PMMA auxiliary agent configuration are uniformly mixed, the two uniformly mixed materials are respectively poured into the barrels of two single-screw extruders and extruded simultaneously, and the PVC material and the PMMA material are fused and extruded in a forming mold.

2. According to claim 1, a new type of bus interior with a metallic texture made of PMMA and PVC co-extruded, characterized by: The PVC raw materials and the PVC additives are configured, and the PMMA raw materials and the PMMA additives are configured and uniformly mixed through a mixer.

3. According to claim 2, a new type of bus interior with a metallic texture made of PMMA and PVC co-extruded, characterized by: The two evenly mixed materials are poured into two single-screw extruders respectively, and the materials are melted into a molten state by high temperature and extruded simultaneously.

4. The novel bus interior decoration with a metallic texture made of PMMA and PVC co-extruded according to claim 3, characterized in that: The two materials are combined in the molding die through a single-screw extruder, so that the PMMA material is evenly covered on the PVC material and extruded together to form a new interior with a metallic surface.

Images