CN209832670U - Supercritical fluid extrusion blow molding foaming forming device - Google Patents

Abstract

The utility model provides a supercritical fluid extrudes blowing foaming forming device, the device include the feed system, double screw extruder, admission valve, pressure air pump, connector I, dynamic mixing roll, connector II, the melt pump, connector III, single screw extruder, right angle aircraft nose and blow mold. The feeding system is arranged at the feeding section of the double-screw extruder, the air inlet valve is connected with the pressure air pump and the melting section of the double-screw extruder through the air conveying pipe, the double-screw extruder and the dynamic mixer are connected through the connector I, the dynamic mixer and the melt pump are connected through the connector II, the melt pump and the single-screw extruder are connected through the connector III, the right-angle machine head is arranged at the discharge end of the single-screw extruder, and the blow molding die is arranged below the right-angle machine head. The device is suitable for thermoplastic polymers, realizes the production of extrusion blow molding foaming products by utilizing supercritical fluid, and has the characteristics of simple structure, cost reduction, environmental protection, convenient operation and control and the like.

Description

A supercritical fluid extrusion blow molding foam molding device

technical field

The utility model relates to a polymer extrusion blow molding foam forming device, in particular to a supercritical fluid extrusion blow molding foam forming device.

Background technique

Extrusion blow molding is a commonly used polymer molding method, which is widely used in daily necessities, washing, beverage packaging, industrial storage and transportation and other fields. Extrusion blow molding is a molding method in which a thermoplastic polymer is continuously extruded through an extruder from the head to obtain a polymer parison, and then blown into a blow mold. Compared with injection molding, its equipment cost is lower, its adaptability is stronger, its formability is good, and it can form products with complex undulating curves.

However, traditional extrusion blow molding has disadvantages such as easy deformation of the product, high material consumption, and poor impact resistance. Compared with traditional extrusion blow molding, extrusion blow molding foam molding can effectively solve such problems, and the product has better mechanical properties such as notched impact strength, toughness, specific strength, and fatigue life will also be longer It can be greatly improved, and hollow foamed products with different shapes and functions can be produced according to the different extrusion blow molding foamed materials and product structures.

Extrusion blow molding can adopt the method of adding chemical foaming masterbatch to the polymer raw material, but it may cause potential problems such as residue in the material and environmental pollution during processing. Supercritical CO ₂ or N ₂ as a physical blowing agent has the advantages of low price, safety and no pollution, and has been widely used in the production process of extrusion blow molding or injection blow molding.

Contents of the invention

The utility model aims at the deficiencies of the existing production technology, combines the potential market advantages of extrusion blow molding foamed products, uses supercritical CO ₂ or N ₂ as foaming agent, and integrates extrusion blow molding and extrusion through reasonable structural design. The advantages of foam molding technology for integrated production have the advantages of reducing the weight of blow molding products and improving the impact strength of blow molding products.

A supercritical fluid extrusion blow molding foam molding device described in the utility model includes a feeding system, a twin-screw extruder, an air inlet valve, a pressure air pump, a connecting body I, a dynamic mixer, and a connecting body II , Melt pump, connecting body Ⅲ, single-screw extruder, right-angle head and blow mold. The feeding system is set in the feeding section of the twin-screw extruder, the inlet valve is connected with the pressure air pump and the melting section of the twin-screw extruder through the gas delivery pipe, and the connecting body I is connected with the twin-screw extruder and Dynamic mixer, the connector II is connected to the dynamic mixer and the melt pump, the connector III is connected to the melt pump and the single-screw extruder, and the right-angle head is set at the output of the single-screw extruder end, the blow mold is set below the right-angle die.

A supercritical fluid extrusion blow molding foam molding device described in the utility model, the blow molding mold includes a mold cavity, a mold body, a cooling system, a cutout part, an exhaust hole groove, a guide part, a heating system and Air compression system.

The utility model relates to a supercritical fluid extrusion blow molding foam molding device, the heating system is a mobile annular infrared heater. The mobile annular infrared heater includes a luminous tube, a reflective film, a temperature regulating system and a guide rail. Realize the precise temperature control of the parison, prevent the parison from foaming too quickly during the extrusion process, and improve the quality of blown foamed products.

A supercritical fluid extrusion blow molding foaming device described in the utility model, the cooling system is provided with a cooling water channel, the hole diameter of the cooling water channel is 10-25 mm, and the hole spacing is 30-100 mm.

The utility model relates to a supercritical fluid extrusion blow molding and foaming forming device, wherein the right-angle die is a spiral side-feeding right-angle die. The head mandrel is designed in a spiral shape at the entrance of the melt, which can not only further mix the homogeneous system, but also play a role in stabilizing the pressure.

According to the supercritical fluid extrusion blow molding and foaming molding device described in the utility model, according to the size and shape of the product and the requirements of production volume, the blow molding mold adopts reciprocating two-part mold forming or rotary disc-type multi-part mold forming .

A supercritical fluid extrusion blow molding foam molding device described in the utility model, the twin-screw extruder is provided with six temperature control zones, and the temperature control range: the first zone is 150~180°C, and the second zone is 180~ 210℃, 180~210℃ in the third zone, 180~210℃ in the fourth zone, 170~190℃ in the fifth zone, 160~185℃ in the sixth zone. The temperature control range of the linker I is 150-220°C. The temperature control range of the dynamic mixer is 110-210°C. The temperature control range of the linker II is 110-220°C. The temperature control range of the melt pump is 110-210°C. The temperature control range of the linker III is 110-220°C. The single-screw extruder is equipped with four temperature control zones, and the temperature control range is: 135-190°C in the first zone, 145-200°C in the second zone, 150-200°C in the third zone, and 150-200°C in the fourth zone. The temperature control range of the right angle head is 130~210°C. The air intake of the pressure air pump is 5-30ml/min.

The utility model has the following positive and beneficial effects

The utility model adopts supercritical fluid _CO2 or _N2 as the physical foaming agent, compared with the chemical foaming agent used in the traditional extrusion blow molding foam molding device, it has no residue, is non-flammable, non-explosive, non-toxic and non-toxic. Corrosion equipment, green environmental protection and low price and other advantages.

The utility model adopts a mobile annular infrared heater to realize precise control of the temperature of the tubular parison, effectively avoiding potential problems such as early foaming of the polymer during extrusion from a right-angle die, and difficulty in foaming at too low a temperature.

The utility model integrates polymer extrusion blow molding and extrusion foam molding, thereby improving production efficiency. The weight of the obtained product is reduced, the thermal insulation effect is obvious, the impact performance is excellent, and surface quality defects such as deformation, depression, and uneven thickness can be reduced, and the dimensional stability of the product can be improved.

Description of drawings

Fig. 1 is a schematic structural view of a supercritical fluid extrusion blow molding foaming device described in the present invention;

Fig. 2 is a schematic diagram of a right-angle nose according to the utility model;

Fig. 3 is the top view of the blow molding mold described in the utility model;

Fig. 4 is the extruded parison schematic diagram of the extrusion blow molding foam molding described in the utility model;

Fig. 5 is a schematic diagram of the clamping of the parison and the closing of the mold of the extrusion blow molding foam molding described in the utility model;

Fig. 6 is a schematic diagram of an inflated parison and a cooling parison for extrusion blow molding according to the present invention;

Fig. 7 is a schematic diagram of the mold opening and taking out of the extrusion blow molding foam molding described in the present invention;

The meanings of the symbols in the figure are: 1—feeding system, 2—twin-screw extruder, 3—intake valve, 4—pressure air pump, 5—connector I, 6—dynamic mixer, 7—connector Ⅱ, 8—melt pump, 9—connector Ⅲ, 10—single screw extruder, 11—right-angle head, 12—blow mold, 13—extruder joint, 14—outside of head, 15—core Rod, 16—die, 17—adjusting bolt, 18—mandrel, 19—mold body, 20—mold cavity, 21—mobile annular infrared heater.

Detailed ways

Example 1

Referring to Figures 1 to 7, a supercritical fluid extrusion blow molding device includes a feeding system 1, a twin-screw extruder 2, an air intake valve 3, a pressure air pump 4, and a connecting body I5 , Dynamic mixer 6, connector II7, melt pump 8, connector III9, single-screw extruder 10, right-angle head 11 and blow mold 12. The feeding system 1 is set in the feeding section of the twin-screw extruder 2, the inlet valve 3 is connected with the pressure air pump 4 and the melting section of the twin-screw extruder 2 through a gas delivery pipe, and the connecting body I5 is connected to the twin-screw extruder. The screw extruder 2 and the dynamic mixer 6, the connector II7 connects the dynamic mixer 6 and the melt pump 8, the connector III9 connects the melt pump 8 and the single screw extruder 10, and the right angle The head 11 is arranged at the discharge end of the single-screw extruder 10 , and the blow mold 12 is arranged below the right-angle head 11 .

The blow mold 12 includes a mold cavity 20, a mold body 19, a cooling system, a cutout portion, an air vent, a guide portion, a heating system and an air compression system.

The heating system is a mobile annular infrared heater 21 . The mobile annular infrared heater 21 includes a luminous tube, a reflective film, a temperature regulating system and a guide rail. There are 5 luminous tubes.

The cooling system is provided with a cooling water channel, the hole diameter of the cooling water channel is 20mm, and the hole spacing is 80mm.

The right-angle head is a spiral side-feed right-angle head 11 .

The blow mold 12 is molded with two pairs of reciprocating molds.

The twin-screw extruder 2 is provided with a total of six temperature control zones, and the temperature of each zone is set to 160°C in the first zone, 165°C in the second zone, 170°C in the third zone, 180°C in the fourth zone, 185°C in the fifth zone, and 180°C in the sixth zone. ℃. The temperature of the linker I5 is 160°C. The temperature of the dynamic mixer 6 is 170°C. The temperature of the linker II7 is 175°C. The temperature of the melt pump 8 is 185°C. The temperature of the linker III9 is 195°C. The single-screw extruder 10 is provided with four temperature control zones, and the temperature of each zone is set to 170°C in the first zone, 175°C in the second zone, 170°C in the third zone, and 160°C in the fourth zone. The temperature of the right-angle die 11 is 160°C. The air intake of the pressure air pump 4 is 9ml/min.

Example 2

Embodiment 2 has the same functions as those in Embodiment 1, and will not be repeated for the sake of brevity.

The difference between Embodiment 2 and Embodiment 1 lies in the difference in the device: the blow mold 12 is molded by a rotary disc-type multiple mould.

Of course, the creation of the utility model is not limited to the above-mentioned implementation, and those skilled in the art can also make equivalent deformations or replacements without violating the spirit of the utility model, and these equivalent deformations or replacements are all included in this application. within the scope of the claims.

Claims (7)

1. A supercritical fluid extrusion blow molding foaming forming device is characterized in that: including feed system, twin-screw extruder, admission valve, pressure air pump, connector I, dynamic mixing ware, connector II, the melt pump, connector III, single screw extruder, right angle aircraft nose and blow mold, feed system sets up at twin-screw extruder feed section, the admission valve passes through gas conveying pipe and links to each other with pressure air pump and twin-screw extruder melting section, twin-screw extruder and dynamic mixing ware are connected to connector I, dynamic mixing ware and melt pump are connected to connector II, melt pump and single screw extruder are connected to connector III, the right angle aircraft nose sets up at single screw extruder discharge end, blow mold sets up in right angle aircraft nose below.

2. The supercritical fluid extrusion blow molding foam molding apparatus according to claim 1, wherein: the blow mold includes a mold cavity, a mold body, a cooling system, a cutout portion, an exhaust hole, a guide portion, a heating system, and an air compression system.

3. The supercritical fluid extrusion blow molding foam molding apparatus according to claim 2, wherein: the heating system is a movable annular infrared heater which comprises a light emitting tube, a reflecting film, a temperature adjusting system and a guide rail.

4. The apparatus of claim 2, wherein the cooling system comprises cooling water channels with a diameter of 10 ~ 25mm and a distance of 30 ~ 100 mm.

5. The supercritical fluid extrusion blow molding foam molding apparatus according to claim 1, wherein: the right-angle machine head is a spiral lateral feeding type right-angle machine head.

6. The supercritical fluid extrusion blow molding foam molding apparatus according to claim 1, wherein: the blow molding die is formed by adopting two reciprocating dies or a plurality of rotating disc dies.

7. The supercritical fluid extrusion blow molding foaming molding device according to claim 1, wherein the twin-screw extruder is provided with six temperature control zones in total, the temperature control ranges are 150 ~ 180 ℃ in the first zone, 180 ~ 210 ℃ in the second zone, 180 ~ 210 ℃ in the third zone, 180 ~ 210 ℃ in the fourth zone, 170 ~ 190 ℃ in the fifth zone, 160 ~ 185 ℃ in the sixth zone, 150 ~ 220 ℃ in the temperature control range of the connecting body I, 110 ~ 210 ℃ in the temperature control range of the dynamic mixer, 110 ~ 220 ℃ in the temperature control range of the connecting body II, 110 ~ 210 ℃ in the temperature control range of the melt pump, 110 ~ 220 ℃ in the temperature control range of the connecting body III, and four temperature control zones are provided in total in the single-screw extruder, the temperature control ranges are 135 ~ 190 ℃ in the first zone, 145 ~ 200 ℃ in the temperature control range of the single-screw extruder, 150 ~ 200 ℃ in the temperature control range of the four zones, 150 ~ 200 ℃ in the temperature control range of the right angle head, 130 ~ 210 ℃ in the air inlet amount of 5 ~ 30 ml/min.