PU Sandwich Panel Line Using Kraft Paper Backing For Temporary Building Panels

The kraft paper backed PU (polyurethane) sandwich panel production line is an automated system specifically designed for producing lightweight, high-strength temporary building panels. This production line combines modern materials science and precision manufacturing technology to efficiently produce building sandwich panels with excellent thermal and sound insulation properties, especially suitable for temporary buildings, exhibition venues, rapid assembly buildings, and other fields.

sandwich panel line

The main components of the kraft paper backed pu sandwich panel production line

• Raw material pretreatment system
  The production line of kraft paper backed PU sandwich panel starts from the raw material pretreatment stage, which includes:
  Kraft paper roll processing unit: equipped with an automatic unwinding machine, tension control system, and surface treatment device to ensure that the kraft paper is flat and wrinkle free
  Metal panel processing line: including unwinding, leveling, cleaning, and pretreatment processes to prepare for subsequent composite
  PU raw material preparation system: precise measurement of the proportion of polyether/polyester polyols, isocyanates, and various additives

• Composite foam molding section
  This is the core part of the polyurethane sandwich panel production line, with key technologies including:
  Double belt continuous foaming machine: Two sets of steel strips form a continuously moving mold cavity, controlling the foaming process
  Accurate temperature control system: segmented temperature control to ensure uniform foaming of PU and good bonding with backing material
  High pressure injection device: Inject the mixed PU raw material evenly between the kraft paper and the surface material

• Curing and Forming Section
  Segmented solidification tunnel: typically 30-50 meters in length, temperature gradient control ensures complete solidification of the material
  Pressure regulation system: dynamically adjust pressure to ensure uniform thickness of the board
  Online quality inspection: Real time monitoring of product quality through infrared temperature measurement, thickness measurement, etc

• Cutting and post-processing section
  High speed CNC cutting machine: precise vertical and horizontal cutting according to order requirements
  Edge processing unit: automatic trimming and chamfering to improve product aesthetics and safety
  Surface protective film bonding: prevents surface damage during transportation and installation

The kraft paper backed PU sandwich panel line incorporates multiple innovative technologies:

• Intelligent control system: using PLC and industrial computer joint control to achieve automatic adjustment of production parameters
  

• Energy recovery device: The utilization rate of heat energy recovery in the solidification section can reach over 60%
  

• Environmental treatment system: VOC collection and purification device, in compliance with strict environmental standards
  

• Modular design: easy to adjust production line configuration according to product specifications
  

• Big data analysis: cloud storage and analysis of production data to optimize process parameters

Detailed explanation of production process flow

• Raw material preparation:
  After surface treatment, the kraft paper roll enters the production line
  Metal panels (usually color steel or aluminum plates) are cleaned and pre treated
  PU raw materials are mixed in precise proportions

• Laminated composite:
  The bottom layer of kraft paper is first laid on the conveyor belt
  PU mixture evenly sprayed on the surface of kraft paper
  Accurate alignment and coverage of the upper metal panel

• Foam molding:
  Entering the double belt press, PU begins to foam and fill the entire cavity
  Complete expansion and cross-linking reactions under controlled temperature and pressure

• Curing and shaping:
  Curing tunnel controlled by temperature gradient
  The material properties have reached a stable state

• Precision machining:
  Cut according to specifications after cooling
  Edge processing and quality inspection

The kraft paper backed PU sandwich panels produced through this polyurethane sandwich panel production line have the following significant advantages:

• Lightweight: 30% -50% lighter than traditional building materials, reducing transportation and installation costs
  

• Excellent thermal insulation performance: thermal conductivity as low as 0.022W/(m · K)
  

• Quick construction: can be installed quickly, greatly reducing the construction period
  

• Environmentally friendly and recyclable: Kraft paper backing is easy to recycle and handle
  

• High cost-effectiveness: comprehensive cost lower than traditional temporary building solutions

The product is widely used in:

• Temporary office space and work shed
  

• Exhibition venues
  

• Post disaster emergency housing
  

• agricultural greenhouse
  

• Mobile medical facilities
  

• Temporary facilities for sports events