Wood plastic composite plastic The energy-saving nature of wood-plastic composite plastics is the use of natural wood processing waste (such as wood chips, wood flour, hemp fiber, fruit shells, rice bran, pulp, orange straw, bamboo powder, etc.) for superfine surface treatment and blending with synthetic resin. , Filling volume can be as high as 50%, molded products can be sawed, planed, drilled, and low water absorption, moisture deformation, formaldehyde-free, in line with environmental protection, flame retardant and other safety requirements. In the past, sawdust, wood flour, and waste materials were mostly burned, which was a waste of large amounts of resources and caused environmental pollution. As a kind of energy-saving, material-saving and environment-friendly materials, wood-plastic composite materials have attracted international attention and many research results. Over the past 10 years, North American WPC has grown at a rate of 50% annually. The development of wood-plastic composite plastics is more meaningful in China because in 2000 China's wood demand was as high as 101.9 million m3, the supply volume was 63.90 million m3, and the gap was as high as 38 million m3. In contrast, the two-step granulation allows the main granulator to be fed continuously, where the hopper acts as a buffer. Feeding in this way optimizes the entire production process because it is no longer necessary for those operating personnel to operate the granulator without interruption so that it can perform other tasks. $Page Breaker $ Kautex Show KCC20D Extrusion Blow Molding Machine    In this year's booth (W2, E03), Kautex displayed a KCC20D extrusion blow molding machine. It is equipped with a ZWVP30 four-cavity die with a center-to-center distance of 100 mm. In this demonstration, this machine produced 0.75 liters round bottles at a production capacity of 2,400 per hour. Single sandwich injection Ningbo Yinzhou Hengxi Winbate Household Product Manufacturer , https://www.winbate.com
Wood-plastic composite materials are mainly used in the construction industry (construction decking), automotive industry (doors, rear shelves, ceilings, overhead boxes, protective panels, etc.), warehousing (pallets, pallets, packing boxes), transportation industry (Highway noise barriers, protective rails, warehouse partitions, railway sleepers), agriculture (shelves, tanks, buckets), facilities (floors, tables, chairs, sheds, ladders, etc.). Taking trays as an example, the domestic market demand is about 100 million. More than 90% of them need to be changed to wood-plastics, and 10 million tons of new products worth 60 billion yuan should be developed.
However, there are many key technologies for the production of wood-plastic composite products: resin, wood flour manufacturing technology, wood flour drying technology, and wood flour interface processing technology; single screw or twin screw pairs are required in injection molding, extrusion, and blow molding equipment. Wood flour has good dispersibility, wettability, mixing, shearing, degassing, dehydration, devolatilization, and elimination of air bubbles; plasticized parts should be corrosion-resistant and wear-resistant; equipment should have the above process conditions and materials The exact control function of the residence time of each part.
TPE rapid processing technology
It is predicted that in the near future, injection molding processors can significantly reduce the processing cycle by adopting a new technology when processing SantopreneTM thermoplastic rubber. Using this technology not only can significantly reduce the cost of producing a single part, but also increase the processing capacity of injection molding. In conjunction with this advanced processing technology, a new SantopreneTM TPE series will soon appear with a new look, which will be 25% faster than the usual SantopreneTM rubber grades. These materials with improved forming properties can also significantly reduce the production costs for injection molding processors.
According to reports, by putting this latest SantopreneTM rubber technology into the market, it will help processors to save production costs and increase production capacity, which will help them expand their business. At the same time, this rapid processing of new technology has further expanded the economic boundaries of choosing SantopreneTM rubber instead of thermoset rubber.
Other advantages of choosing SantopreneTM rubber instead of thermosetting rubber include ease of processing, design flexibility, reliable part consistency, recyclability, and efficient use of waste, which includes waste generated during the production process and after the life of the part. .
This technology can also be used for injection molding, blow molding and extrusion molding. However, the one that can best benefit from this new technology is a type of production that requires a long processing cycle like injection molding.
$Page Breaker $ New Direction for Packaging Machinery Control Technology Development
Today's mechanical control system appears to be single, but its interior contains logic and motion control systems, human-machine interaction systems, diagnostic systems, and even artificial intelligence systems. The following examples from the packaging machinery manufacturing industry will reveal new directions for the development of mechanical control systems.
As with most technologies, mechanical control technology has experienced twists and turns in its development. It has evolved from a simple and large control system in history to today's small multi-functional control system, which combines mechanical, motion control and communication systems.
Initially, Dubbed Gen1, the first-generation packaging machine used in the packaging field, was simple in structure and purely mechanical. A linear motor rotates by a motor and generates power through a cam. Using a programmable controller (PLC) control system, the structure is also very simple, the operator directly controls the machine. In most cases, human-machine interaction technology (HMI) has not yet been adopted. After that, there appeared the second generation of packaging machinery. This technology was born a decade ago, packaging machinery is still driven by the drive shaft, but the structure is more complex, because the servo motor to control the speed, so it can give instructions to some special actions, but also uses a more complex PLC can Programming logic controller. Indeed, the second generation of packaging machinery is more tunable, but this advantage requires higher costs. These costs include more line layouts, more PLC programmable logic controller input/output (I/O) devices, these devices are large and complex, have more sensors and program control, and even more peripherals Equipment; and it is more difficult to troubleshoot and deal with failures.
Today's third-generation packaging machinery incorporates the so-called "mechanical and electronic" concept, using servo systems and simple mechanical devices to achieve complex motion. The goal pursued by vendors is: Machines are cheaper, work faster, perform better, and have a small footprint, so it's no surprise that new technologies are introduced on demand.
The third-generation packaging machinery was born four years ago. Its development focus shifted to single-box control technology. It has logical PLC functions and I/O devices. If necessary, it can also be equipped with HMI technology, even Ethernet and network communication. Service system to facilitate communication between companies. Previously, second-generation packaging machines required an encoder and programmable limit switch (PLS) to determine the servo position. Now, because of the I/O device of the third-generation packaging machine, the servo control system exists in a processor. When the servo system is in place, a sensing action is generated and a signal is sent through the bus to start any one of the needs. The process flow.
Two-step granulation of engineering thermoplastics
The WEIMA Machine Company of Germany presented the latest results of the two-step granulation equipment at the plastic show in Milan on February 14-18, 2006. It features two main granulators. The equipment is suitable for economic pelletizing of engineering thermoplastics such as ABS, PA, PBT, PC, POM, PPA, LCP, etc., especially the granulation of reinforced grade glass fibres, in the form of starting large pieces of waste or bulk production of leftovers.
In the two-step granulation, the material to be granulated is pre-granulated to a size of about 40 mm in a WLK type rigid uniaxial main granulator, and then further granulated to about 3 by a NZ type subsequent secondary granulator. - 10 mm final particles, which are specially designed for the secondary granulation of the pre-granulated material.
In order to avoid failure of the granulation, it is necessary to continuously feed the crusher in an adequate amount, and these requirements are generally difficult to guarantee by manual operations. In case of overfeeding, it usually causes uneven granulation, undulation, and high standard noise. The result is that the material that accumulates or is being crushed weakens its thermal energy due to friction. In addition, the higher sensitivity to interfering materials, as well as the general higher blade wear that causes frequent blade replacement, remains to be seen.
Pre-granulated particles are now well incorporated into the NZ secondary granulator through control of an on-off switch. The arrangement of the two granulators can be chosen one above the other or one after the other. The secondary granulator works according to the working principle of the cutter and is designed for pre-granulated particles. Compared to the conventional granulator, the second generation granulator has a much smaller volume and requires less overall drive energy. Due to its uniform feeding, it operated at a speed of approximately 450 min-1 and no failure occurred. When such a granulator is used for the second pulverization of the pre-granulated material, the noise level generated is much lower than that of the one-step processing with the same rotation speed (n=450-500 min-1).
Kautex offers a wide range of blow molding machines. For the production of continuous extrusion or storage cylinder heads, with mobile clamping units, or in packaging containers with capacities from a few milliliters to 30 liters, even to large containers of 10,000 liters, six or seven layers The co-extruded fuel system, as well as the production of three-dimensional spiral tubes, are equipped with a parison feeding device. In this way, the flash edge can be minimized to meet the requirements for the use of automotive pipes, household appliances and other technical components.
Industry faces tremendous pressure on the need for flexibility and continuous improvement of production methods. Current trends, such as more and more types of car models targeting specific markets, require further development in terms of platform sharing policies, parts sharing systems and modular design methods. Other hot topics include added value, improved functionality, and reduced vehicle weight.
The plastics industry can now make significant contributions in several areas of lightweight construction, versatility, and design flexibility. Moreover, processes such as single-sandwich, multi-component solutions, reduced cycle times, and reduced energy consumption can help reduce overall costs. Reduced material requirements and shorter cycle times can increase production output and can play a significant role in the production costs associated with single-component automotive parts.
Advantages and Disadvantages of Injection Process
Injection blowing process advantages:
1. The plastic bottle can be molded from raw materials to finished products at a high degree of automation without the need for manual secondary processing, which saves labor, and is hygienic and meets the GMP requirements for pharmaceutical packaging, and is particularly suitable for the production of vials.
2. The appearance of the product is beautiful, the size of the bottle mouth is accurate, and the weight of the plastic bottle is stable.
3. The plastic products are made by injecting the preforms at one time. There is no waste at the bottle mouth and the bottom of the bottle, and the bottle mouth has good sealing performance.
4. Suitable for the production of high-grade exquisite plastic hollow products, such as cosmetic bottles, baby bottles, space cups, lamp balls and so on.
There are several disadvantages to the injection process versus the extrusion process:
1. The process is complicated and the mold processing is difficult and difficult to master.
2. Many mold parts, long production cycle