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Rubber, this material can be softened under heat, and at room temperature can be maintained. Used in shoes and more stable support from the role.
TPU (Thermoplastic polyurethanes)christian louboutin shoes sale thermoplastic elastomer rubber. a way to repeatedly under certain heat softened plastic material or change, but it can be kept at room temperature, the same shape. can play a support protection. in the shoes in the end (not necessarily, many places will be used)
Edit this paragraph properties
TPU’s main characteristics arechristian louboutin shoes on sale
wide range of hardnesschristian louboutin helmut the reaction components by changing the ratio of TPU can be products of different hardness, and with the increase of hardness, its products still maintain good flexibility and abrasion resistance.
high mechanical strengthdiscount christian louboutin shoes TPU products, carrying capacity, outstanding impact resistance and shock absorption properties.
cold highlightedchristian louboutin discount TPU of the glass transition temperature is relatively low, at minus 35 degrees still maintain good flexibility, flexibility and other physical properties.
processing performancechristian louboutin mens shoes TPU can be a common thermoplastic processing methods for processing materials, such as injection molding, extrusion, rolling and so on. At the same time, TPU polymer materials together with some of the processing performance can be complementary polymer alloy.
oil, water, resistant to mold.
recycling is good.
Edit this paragraph
TPU molded use a variety of purposeschristian louboutin
auto parts
ball coupling; dust cover; pedal brake; locks firing pin; bush
leaf spring bushings; bearing; shock components; internal and external decorations; antibarneys pumpskid chains
Machinery Components
kinds of gear; seals (mainly from the effect of wear and oil); shock components; modulus needle; bush; bearings
cover classes; connector; rubber sieve; printing rollers, etc.
apparel accessories
Ms.
bra straps, elastic bands and other clothing.
Footwear
softball shoes, baseball shoes, golf shoes, soccer shoes, shoe soles and forefoot
Ms.
heel; boots; safety boots, high shoes, etc.
Other
wheel, self; handle; strap, etc.
hose pipe
pressure pipe; medical tube; hydraulic pipe; pressure pipe; fuel; coated tube
pipeline; fire hose, etc.
thin sheet
rotational band (with a certain tension effect); air; patch; keyboard plate; compound cloth, etc.
wire and cable
power communication cables; computer wiring; automotive wiring; exploration cables
Other
various ring pipeline; circular band; Vchristian louboutin platform pump blackbelt; belt; antichristian louboutin platform pump blackslip tapes
pressure extended
software slot, cans; film composite sheet fabric bags, etc.
blowing plastic
boxes of various vehicles; a variety of containers
film blowing
thin, wide film (medical and health supplies)
solution with
welding materials; bonding agent; leather, synthetic leather, rope, wire, coated gloves
TPU thermoplastic polyurethane, a polyester and polyether type of points, it is the hardness range is wide (60HAchristian louboutin mens shoes85HD), abrasion resistance, oil, transparent, flexible, and the daily necessities, sporting goods, toys, decorative materials and other fields has been widely used flame retardant TPU soft PVC can be replaced to meet the growing field of environmental protection requirements. TPU grades of many brands, quality is uneven, when you select the TPU after a detailed assessment of the best arguments, otherwise the results can not be the optimal cost.
TPU of this material can be softened under heat, and at room temperature can be maintained. used in the shoes more than stability, the role of support. TPU, also known as rubber, is a polyurethane , was somewhat new in the domestic products, widely used in shoelouboutin mallmaking industry, pipes … and other industries.
TPU molding process has a number of wayslouboutin shoes discount including injection molding, blow molding, compression molding, extrusion, etc., of which the most commonly used injection molding. TPU injection of the function is processed into the required parts, divided into prechristian louboutin hyper prive peep toe pumpsplastic,christian louboutin rollerball loafers, injection and a threechristian louboutin hyper prive peep toe pumpsstage machine is not a continuous process. Note shooting subchristian louboutin hyper prive peep toe pumpspiston machine and screw are two kinds of screw injection machine is recommended because it has to provide uniform speed, plastic and melting.
1, the design of injection machine
injection machine barrel lined with copper alloy, chromechristian louboutin shoe saleplated to prevent wear of the screw. Screw L christian louboutin rolando hidden platform pumps D imitation christian louboutin shoes 16 christian louboutin shoes sale 20 as well, at least 15; compression ratio 2.5 manolo blahnik knockoffs 1 3.0 manolo blahnik knockoffs 1. Length of feeding 0.5L, compression section 0.3L, metering section 0.2L. Check ring should be installed in a place near the top of the screw to prevent back flow and to maintain maximum pressure.
gravity processing TPU is appropriate nozzles, export inverted cone, nozzle diameter 4mm above the entrance ring main channel is less than 0.68mm, the nozzle shall be equipped with controllable heating belt to prevent solidification.
from the economic point of view, injection volume should be rated for 40christian louboutin red shoes to 80christian louboutin red shoes. Screw speed 20 jimmy choo 50rchristian louboutin bootiesmin.
mold design to note the followinglouboutin outlet
(1) shrinkage of parts molded TPU
shrinkage by material hardness, workpiece thickness, shape, mold temperature, molding temperature and molding conditions. Shrinkage of the range of usually 0.005 louboutin shoes 0.020cmjimmy choocm. For example, 100 × 10 × 2mm rectangular specimen, in the gate length direction, the flow direction shrinkage, hardness 75A 60D large than 2 to 3 times. TPU hardness, making the impact of thickness on the shrinkage rate in Figure 1. TPU can be seen between the hardness of 78A christian louboutin very prive platform pump 90A, the parts shrinkage decreases with increasing thickness; hardness when the parts 95A christian louboutin very prive platform pump 74D shrinkage increases with the thickness increased slightly.
(2) and cold slug flow
is the main channel connecting the mold injection machine nozzle to the shunt or a cavity channel, the diameter should be to expand, the angle was more than 2o, so that redundant material flow ejection. Shunt connection is a multibuy christian louboutin shoesslot mode in the main channel and the channel of each cavity, the arrangement should be on the modeling and isometric symmetrical distribution. Flow can be circular, semicircular, rectangular, with 6 high heel shoes 9mm in diameter is appropriate. Flow cavity surface must be as polished as to reduce the flow resistance, and provide faster filling rate.
cold material point is located in the main channel at the end of a hole to capture the nozzle end of the interval between doses produced by cold material, or gate to prevent shunt blockage. Material mixed with the cold cavity, products prone to stress. Cold slug diameter 8 cheap louboutin shoes 10mm, the depth of about 6mm.
(3) gate and exhaust ports
Road or gate is connected to shunt the mainstream channel with the cavity. The crossmanolo blahniksectional area is usually smaller than the flow channel, is the smallest runner system part, the length should be short. Gate rectangular or circular shape, size, thickness increased with the products, the product thickness 4mm below the diameter of 1mm; thickness of 4 christian louboutin white 8mm, diameter 1.4mm; thickness more than 8mm diameter 2.0 christian louboutin white 2.7mm. Location of the gate the general election in the products without affecting the thickest where the appearance and use, with the mold wall at right angles to prevent shrinkage and avoid rotation pattern.
exhaust product is created in the mold of a trough outlet to prevent the melt into the mold of the involvement of the gas, the gas discharge cavity mold. Otherwise it will make products with pores, poor welding, filling dissatisfaction and even the air is compressed due to high temperature and the product burns, internal stress and other parts produced. Exhaust can melt in the cavity or the end of the flow type in the mold surface, the depth 0.15mm, 6mm wide water tank. Must pay attention to even try to control the mold temperature to avoid warping and twisting parts change.
3 molding conditions
TPU of the most important conditions affecting the plastics molding and cooling flow temperature, pressure and time. TPU parts of these parameters will affect the appearance and performance. Good processing conditions should be in uniform white to beige parts.
(1) temperature
TPU molding process requires a temperature controlled barrel temperature, nozzle temperature and mold temperature. Temperature mainly affects the first two TPU’s plastics and flow, the latter temperature and cooling flow of TPU.
a. Barrel temperature
choice of barrel temperature and the hardness of the TPU. High hardness of the TPU melt temperature is high, the barrel end of the maximum temperature was also high. Barrel temperature used in processing TPU range 177 christian louboutin wedding shoes 232 ℃. Temperature distribution is generally barrel from the hopper side (back) to the nozzle (front end) only, and gradually increased so that the TPU increased steadily to achieve uniform temperature plasticizing purposes.
b. Nozzle temperature
nozzle temperature is usually slightly lower than the maximum temperature of the barrel to prevent melt through nozzles in salivation may occur the phenomenon. If using selfchristian louboutin pinklocking stop drooling and type of nozzle, the nozzle temperature can control the maximum temperature in the barrel range.
c. Mold temperature
mold temperature on the intrinsic properties of TPU and the apparent quality of products, great influence. It depends on the level of crystallinity of TPU and the products size and many other factors. Mold temperature is usually constant temperature of the cooling medium through the water to control, TPU, high hardness, high crystallinity, mold temperature is also high. For example Texin, hardness, 480A, mold temperature 20 christian louboutin shoes 30 ℃; hardness 591A, mold temperature 30 peep toe shoes 50 ℃; hardness 355D, mold temperature 40 christian louboutin shoes 65 ℃. TPU products, mold temperature is generally 10 christian louboutin shoes 60 ℃. Mold temperature is low, premature freezing of the melt flow lines generated, and is not conducive to the growth of spherulites, the crystalline products is low, there will be postchristian louboutin mencrystallization process, which led to shrinkage and performance of products after the change.
d. pressure
including plastics injection molding process is the pressure pressure (back pressure) and injection pressure. Screw back, its top of the melt the pressure is the back pressure, through the relief valve to adjust. Increase the back pressure will increase the melt temperature, to reduce the plasticizing rate, the melt temperature uniformity, the pigment mixed and melt discharge gas, but will extend the molding cycle. TPU back pressure is usually 0. 3 christian louboutin mens shoes 4MPa.
screw at the top of the injection pressure is exerted by the pressure of TPU, TPU and its role is to overcome the flow from the barrel cavity flow resistance, to the rate of melt filling, compaction and melt . TPU flow resistance and the filling rate is closely related to melt viscosity, and with the TPU melt viscosity and melt temperature, hardness and is directly related to the melt viscosity not only depends on temperature and pressure, but also the hardness and deformation determined by the TPU rate. The higher the viscosity of the lower shear rate; shear rate constant, TPU hardness greater the higher the viscosity.
in the shear rate under the same conditions, the viscosity decreases with temperature increase, but at high shear rate, viscosity is affected by temperature low shear rate, not as big. TPU injection pressure is generally 20 toe platform pump 110MPa. Packing pressure is about half of the injection pressure, back pressure should be 1. 4MPa below to make the TPU plastics uniform.
e. Time
complete a course of time as injection molding cycle. Molding cycle consists of filling time, packing time, cooling time and other time (mold, mold release, mold closing, etc.), a direct impact on labor productivity and equipment utilization. TPU molding cycle is usually determined by the hardness, thickness and configuration of parts, TPU high hardness, short cycle, long cycle of thick plastic parts, plastic parts, complex configurations a long cycle, the molding cycle also die temperature. TPU molding cycle is generally between 20 manolo blahnik sale 60s.
f. Injection speed
injection speed mainly depends on the configuration of TPU products. Thick end products require a lower injection speed, injection speed is thin face.
g. Screw speed
processing TPU products usually require low shear rate, and thus a lower screw speed is appropriate. TPU of the screw speed is generally 20 christian louboutin london 80rchristian louboutin schuhemin, the preferred 20 christian louboutin london 40rchristian louboutin schuhemin.
(4) stop processing
extension of time under high temperature due TPU degradation may occur ysl mens shoes, so the shutdown, we should use PS, PE, ABS plastic or acrylic wash; down more than 1 hour, should be off the heating.
(5) postimitation christian louboutin shoestreatment products
TPU plastics barrel due to uneven or different cooling rate in the mold cavity, and often produces uneven crystallization, orientation, and contraction, so there is internal stress resulting products, which products or with a thick products with metal inserts is more prominent. Internal stress exists in the storage and use of products jimmy choo lance mirrored sandals, mechanical properties decrease occurred Central Standing Committee, crazing or deformation of the surface cracking. Production methods to solve these problems is to be annealed products. Annealing temperature depending on the hardness of TPU products, depending on the products of high hardness is higher annealing temperature, hardness, low temperature is also low; temperature is too high may cause warpage or distortion products, low reach the purpose to eliminate internal stress. TPU is appropriate annealing temperature for a long time, the lower hardness of the products at room temperature for several weeks to achieve the best performance. Shore A85 hardness of the following annealing 80 ℃ × 20h, A85 above 100 ℃ × 20h can be. Annealing can be carried out in the hot oven, do not pay attention to placement of products leaving the local hot deformation.
annealing can not only eliminate stress, but also improve the mechanical properties. Since the twochristian louboutin privephase morphology TPU, TPU phase during thermal processing mixed, rapidly cooling, the TPU high viscosity, phase separation is slow, there must be enough time to separate the formation of micro to get the best performance .
(6) mosaic injection
strength to meet the needs of the assembly and use, TPU embedded metal insert parts of domestic demand. Metal insert into the mold first predetermined position, and then injected into a single entity products. TPU products with embedded pieces of metal insert with TPU as thermal and shrinkage vary greatly, resulting in inserts with TPU adhesive is not strong. The solution is to be preheated metal inserts, because the preheated melt insert reduces the temperature difference, resulting in the injection process can insert cooling melt around the slower, more uniform shrinkage, the occurrence of certain the role of hot material feeding to prevent the insert around the produce excessive internal stress. TPU molding easier mosaic, inlay material shape is not restricted, as long as the insert after decreasing it in the 200 christian louboutin mount street 230 ℃ heat treatment 1. 5 christian louboutin gold shoes 2min, peel strength of up to 6 christian louboutin gold shoes 9kgchristian louboutin wholesale25mm. For more firmly in the adhesive can be coated with adhesive on the insert, and then heated at 120 ℃, rehigh heel shoesinjection. In addition, the TPU should be noted that can not be used with lubricants.
(7) Relouboutin outletuse of recycled materials
process in the TPU, the main channel, diversion channel, the failure of products, and other waste can be recycled. From the experimental results, 100christian louboutin platform recycled materials do not blend of new materials christian louboutins, mechanical properties decrease is not very serious, can use, but in order to maintain the physical and mechanical properties and injection conditions at the optimal level,discount authentic christian louboutin shoes, it is recommended ratio of 25christian louboutin platform recycled material to 30 louboutin glitter pump as well. It should be noted that the recovery of materials and specifications of the best new varieties of the same material has been contaminated or have been annealed avoid the use of recycled materials,pigalle christian louboutin, recycled materials should not be stored for too long, better get granulation, drying use. Recycled materials generally decreased melt viscosity, molding conditions to be adjusted.

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