With wooden model composite material in all dance

04 ％ . When Injection Molding polyolefin, stuff is more expensive proportional wood pink (WPC, wooden model composite material) or other and natural material, produce similar treatment problem possibly also. Lumber is hygroscopic material, can absorb the moisture in air, this depends on the climate of surroundings, store next and get on moisture conglutinate in cellular wall (sorption) . The hygroscopic course of lumber relatively longer store after period, airy is mixed relative to atmosphere humidity all round the basis temperature, a specific moisture equilibrium was built in lumber. To the lumber of stoving, the moisture in 3 kinds of different mechanisms brought about air is absorbed and be united in wedlock. Chemical adsorption holds dominant position, become especially the moisture content of lumber is low to be in 0 with 6 ％ between when. Below this kind of circumstance, water element passes photograph adjacent cellulose the hydrogenous key between catenary and form of film of only member water by adsorption. The moisture content of lumber is between ％ of 6 ％ ~15 when, water passes adsorptive mechanism by inspiratory into cellular wall. Water element gets the action of Fan Dehua force or electrostatic gravitation, the water that formed much element is filmy. Phenomenon of wool fine agglomeration basically happens after lumber moisture content exceeds 15 ％ , till the water in cellular wall complete saturation (fiber is saturated) . Water is brought into in the capillary force of cellular wall space, till the cell the wall can no more expand further. All happening of these adsorptive processes are accompanying quantity of heat to discharge. Should undertake to the wood that burns under fiber saturation dry when, the evaporate besides water is calorific, this kind of latent heat must additional offer. The energy that when removing water, every kilogram requires to offer depends on how many lumber has worked appeared, with every kinds the photograph key of adsorptive mechanism can agree. The challenge of WPCInjection Molding is in institute of natural material technology " Ubongo3D " game in the process that undertakes the mould experiments, apparent discovery, enough beforehand dry production of big to WPCInjection Molding batch is necessary. These product edges grow at least 14 millimeter, the largest volume is 13.

72 cubic metre centimeter. Used grain material Fasal Bio F337, and the lubricious mother bead of 4 different color. Opposite for, these grain are pink of expensive stuff wood / polypropylene (PP) compound. Because lumber proportion is high, the moisture content in this moulding compound can exceed 1 ％ , and store for a long time, this is meant, of Injection Molding beforehand dry it is indispensable. According to the diverse demand to the product, 4 kinds used to differ in production, every kinds of pattern that all has 10 models accent. Production experiments in the begining, unload grain in 120 ℃ , with desiccator of circular type air beforehand dry 4 hours. Desiccator of circular type air uses the air all round to undertake dry. Air is likely humidity is very high, this depends on climate. Compare with dry air desiccator, although be used below high temperature, dry efficiency can be reduced because of this. These dry systems make use at dry empty temperamental measure to have seasonal dependence, because summertime humidity is general taller than winter. The temperature of canister of makings of the machine that note model is adjusted to make an appointment with 190 ℃ , and cycle time is 45 seconds. The first problem that produces a test includes the necessity that cools for long, inhomogenous pigment is ad cool-headed, bad combustion taste, the component dark mark that is not homogeneous phase to fill model and the dirt that go up by mould ejector to cause (see a picture 1) . In machine respect, of the mould rustily increased to uphold requirement, at the same time bisect face is mixed of ejector clean a requirement taller also. As a result of,these quality blemish are dry inadequate, moisture stops was in in lumber cell wall and cause. In the process that note model, the grain inside air cylinder is heated to be as high as 200 ℃ , brought about what adsorption divides in the water in lumber to evaporate thereby. In the air cylinder that close, water vapour cannot escape, still withhold shape in heat in compound. Noting model to enter model in the process of antrum, model changes material to be forced to pass a narrow grid with very high rate, increase of the pressure in bringing about moulding compound thereby and temperature further. The catenary that note model can undertake dilate after entering a mould only. As a result of game the large volume of chip and the proportion that the vapour with relatively may inferior mould exports an area, below high pressure, release working procedure perforative all hollow and the stoma of the mould. The pollution that produces from this may be the thing of woodiness component extraction that quantity of heat and moisture bring. In the lumber of former strange kind, only water-solubility extract, glucoside of horn of the acid that measures like small element, black or phenol kind form scale to be as high as 4 ％ . The WPCs that optimizes dry parameter to be used at Injection Molding beforehand the reliability that dry inadequacy can affect production, injection Molding quality and the life of the model that note model. It is the most important that WPC notes model and most what the preparative working procedure that often is ignored expects for bead is optimal beforehand dry. The type that the critical factor of good dry quality is desiccator (circular air, vacuum, dry air) , dry temperature and dry time. Considering the quality of Injection Molding, time and cost of specific power consumption, to optimize the dry working procedure of grain of Fasal Bio F337, institute of natural material technology had many dry test, those who use is Drymax D60-150-PDC-180C of the dry air that offers by company of Austrian Vienna Witt-mann Kunststoffgeräte desiccator (see a picture 2 left) . The dry air quality that the one large dominant position of this kind of dry system depends on using is constant. Desiccator is additional still deployed a condenser that return vital energy and memory of a condenser water, with eliminating the diminution of quality of woodiness component from dry circuitry. Conveyer of use Feedmax A206-PDC (manufacturer: Witt-mann) the new grain of upside area supply that will be dry hopper. The Feedmax B203-PDC conveyer that does grain to go up in the machine that note model by installation is metric send metric unit. Dry hopper upside, among have 3 temperature sensor with bottom, the temperature that their special function makes grain medium distributings can undertake dogging accurately, and be as long as several hours (see a picture 2 right) . Nextpage is the metabolic setting of dry temperature 110, 120 with 130 ℃ . Every two hours determine dry time is final to grain the influence of moisture content. Begin as a result of all dry experiments at room temperature, dry time still includes to heat level. Adopt the grain sample with different dry kind to fight direct infuse to go in the machine that note model through mobile inserts, store in the sealed container in water vapour. To determine moisture content, use anhydrous methanol to come out moisture from the extraction in grain above all. Extraction needs two weeks. The water in sample of divide into equal parts of this kind of extract, according to blocking Er cost to rest the law passes chemical method to undertake ration determines. In taking sample with not dry ginseng from every dry experiment, each choose two sample, undertake double determine (4 are measured / sample) . In addition, shape through inject will machine with the grain sample with different dry kind, mix to mould surface game quality undertakes detecting. The temperature in dry air desiccator distributings graph 3 showed from drier heat level begins, the temperature of each area in dry hopper distributings the relation with time. In the inferior area of dry hopper, grain is in the first reached temperature of 100 ℃ above in the hour partly. Of grain of area of dry hopper center heat the time with longer need, because the temperature of this part is made an appointment with,be in 1.

The ability after 5 hours achieves 100 ℃ . And most the grain that carries a layer on the head is after 3 many hours just achieve 100 ℃ . When the air temperature of the eduction in dry hopper achieves set to be worth, can drop dry temperature, with preventing material excessive and dry with fire damage. This measure also came true at the same time energy-saving. The moisture content of the result of dry experiment and final grain is shown 4 times like the graph. Take no account of temperature, dry after two hours, the moisture content of grain from 1.

71 ％ fell 0.

5 ％ are the following. No less than anticipates in that way, lowermost moisture content 0.

25 ％ are to be in what highest and dry temperature obtains below 130 ℃ . In lowermost temperature 110 ℃ , dry the moisture content of the grain after two hours is 0.

5 ％ . After 4 hours, numerical value is 0.

24 ％ and 0.

23 ％ , gets moisture content does not have difference, cannot deciding dry temperature is 110 ℃ still is 120 ℃ . When dry temperature is 130 ℃ , the moisture content of grain has 0 only.

08 ％ . Although be in dry after 6 hours, lowest checks dry temperature to be able to bring about relatively high moisture content only 0.

22 ％ , and this does not suit Injection Molding. In higher temperature 120 ℃ fall with 130 ℃ , the moisture content of grain is respectively 0.

05 ％ and 0.

03 ％ , achieved moisture content of lowest of Injection Molding first-rate. Initiative moisture content is 1.

Dry experiment makes clear the Fasal F337 of 71 ％ , should make WPC bead makings gets fast and efficient dry, dry temperature must be 120 ℃ at least. No less than is expected, below high moisture content, the dry speed of grain is in than moisture content apparently 0.

Under 3 ％ fast. As to the treatment function of Injection Molding, all moisture content are in 0.

The grain of 08 ％ above showed the contamination deposit that condenses to go up with the mould (see a picture 5) , and game the dark mark that go up (see a picture 6) . Bead makings is dry below 130 ℃ 4 after mixing 6 hours, got outstanding machinability and very high product quality (headline picture) . CNC Milling CNC Machining