Styrene resin
DATE：2022/4/25 8:43:58 / READ： / SOURCE：This station
Styrene resin
Previously, most PS foam boards were formed by physical foaming method (such as pentane particle system, or direct injection of pentane, or fluorocarbon). However, significant progress has also been made in forming high-density single-layer board or co extruded board (PS or ABS) by chemical foaming method. Hollow board production line www.handern.com comPS foam board can be formed by the porous method shown in Figure 5-30. The main formula consists of 100 parts of PS raw materials, 2 parts of fine talc powder as nucleating agent and 0.1 part of brown pigment. After these mixtures are added to the extruder, they are heated to 200 ~ 220 ℃, and 1.6 parts of butane are added to the mixture. The schematic diagram of the whole production device is shown in figure 5-74.
Among them, 1 in figure 5-74 is the extrusion host. 2 is a special temperature regulator, which is composed of a shell body 15 and a torpedo body 16, thereby forming an annular channel 4. Schematic diagram of foam board production device of torpedo body 16 1 - host; 2-temperature regulator: 3-Pipe; 4-channel; 5-wind port: 6-speed regulating plate; 7 - outer plate; 8 - cooling setting sleeve; 9 - cooling water machine: 10 - traction range: 11 - primary decoration: 12 - Guide finalizer; 13 - cooling shaper; 14 - die: 15 - shell; The middle of a fish snow body is a cavity, which is equipped with inlet and outlet pipes 3. Through 3, the cooling or heating medium can be introduced for circulation, and the torpedo body 16 can be cooled or heated. A cooling air duct is arranged in the housing 15. In addition, before cooling the forming part 13, an electric heater is set outside each component (not shown in the figure). In this case, the housing 15 is heated. The sample allows temperature adjustment on both sides of channel 4. Generally, 120 ℃ oil can be introduced into the torpedo body for heating. The flow rate regulator 6 is a plate drilled with many holes, and the middle hole is smaller than the peripheral hole, or the length of the middle hole is greater than the length of the peripheral hole. The purpose is to create a flow resistance distribution with the opposite shape to the flow distribution curve in the pipe, so as to adjust the velocity distribution on the section in the pipe to be uniform. The material flows through the speed regulating plate 6 and then enters the outer plate 7. The function of the outer plate 7 is to make the foaming space of the middle and peripheral layers different, so as to control the foaming density of the middle and peripheral layers. 13 is the molding cooling part, which is used to make the material form a hard skin on the skin while foaming. 12. Adjust the size of the product under the guidance of the mouth, so as to enter the cooling setting part 8. Then enter the cooling water tank 9. A roller 11 is installed in the cooling water tank, so that the product will not float in the water on one hand, and the shape of the product is still limited to a certain extent on the other hand. This is a very effective measure to prevent deformation for some wide plates. Thus, the sheet can be pulled to the subsequent foaming device 10 smoothly. Hollow board production line www.handern.com com
The outer plate of the die is shown in Fig. 5-31 and the detailed structure is shown in Fig. 75. This is a perforated plate foaming mechanism with double steps. The discharge outer plate 4 has two (7 and 9), which can be extended into the cooling die sleeve 6. The shape of the cutting mouth of the discharge outer plate 4 is 155mm long and 24mm wide. The rectangular surface is punched with colored small holes, and a sleeve 6 contains two bosses drilled with small holes, with a size of (154x22.5) and a depth of 20mm. The diameter of the edge small hole 1 on the four periphery is 2mm, the length is 20mm, and the hole spacing is 2.5mm. There are 136 such edge holes 1, and the illumination of the holes is very low. 34.3。 The extension length of the table 7 is 5 mm, thereby forming an outer convex surface 8. The second row of outer small holes 2 are distributed on the outer convex surface 8 at a spacing of 5mm. It has a diameter of 1.4mm and a hole length of 15mm, with a total of 60 holes. The distribution density of the holes 2 on the outer convex surface 8 is 12, and the extension length of the inner step surface 9 is also 5mm, which forms the small holes 2 in the central area (4) of the middle convex surface 10. The small holes 2 are arranged on the middle convex surface 9 in a Z-shape with a spacing of 5mm. The hole diameter is also 1.4mm, the hole length is 20mm, the total number is 147, which are arranged in five rows, and the density of the holes is (5) 15.3. It can be seen that the density of hole 1 is the largest and that of hole 2 is the smallest. Their ratio is 2.8:1. In this way, the distribution of material flow density before foaming is large on four sides and small in the middle, which is convenient to obtain the surface layer with hard skin on the edge and low foam density. In the middle, a foam core with high foam density is formed. Circulating cooling is carried out with air in the cooling die sleeve 6, and then further cooled by the cooling host device shown in Fig. 5-74. The traction speed of the traction roller is 22cm / min. the final product is 150mm wide and 20mm thick, the average density is 0.33g/cm, the surface hardness is 60 ~ 70 (measured by D-type hardness tester), the longitudinal bending strength of the product is 19mpa, and the transverse bending strength is 1 edge; 2 an intermediate hole; 3. Development of styrene foam board molding 3 - peripheral hole; 4 - discharge outer plate; 5 - heating ring; 6. A cooling mold sleeve; Hollow board production line www.handern.com com
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