CN103231502B - Multi-layer coextrusion water-cooling blown film unit - Google Patents

Abstract

The invention relates to a multi-layer co-extrusion cold film blow molding machine, comprising a frame, a die head installed on the frame, at least two extruders, a cooling device, a material receiving device and a winding device; the cooling device includes Air-cooling mechanism and water-cooling mechanism, the air-cooling mechanism is above the water-cooling mechanism; five runners and five feed ports are set on the die head, and secondary runners, main runners, second runners and fourth runners are also set The lower part of the first runner gradually approaches the third runner from both sides, the second runner, the third runner, and the fourth runner meet at the upper end of the secondary runner, and the lower parts of the first runner and the fifth runner gradually approach from both sides The secondary runner, the first runner, the secondary runner and the fifth runner meet at the upper end of the main runner. By setting five runners and five feed ports on the die, a five-layer plastic film tube can be produced, and the five-layer film is formed in two steps from the inside to the outside, and the five-layer plastic film tube produced is in the structure The layers are more distinct, improving the quality of the five-layer plastic film tube.

Description

A multi-layer co-extrusion water-cooled blown film unit

technical field

The invention relates to a blow molding machine, in particular to a multi-layer co-extrusion water-cooled blown film unit.

Background technique

A blow molding machine is a machine used to process plastic film tubes. Existing blow molding machines generally include a frame, a die head mounted on the frame, at least two extruders, a cooling device, a molding device and a winding device , the extruder is connected with the feeding port of the die head, the forming device and the winding device are arranged under the die head, and the cooling device is arranged between the die head and the forming device. And the existing die head that is used on the blow molding machine comprises mold core, mold barrel, runner body and fixed seat, and runner body is arranged in the mold barrel, and mold core is arranged in the runner body, and the fixed seat covers the flow channel. The upper end of the mold body is locked on the mold barrel, the runner body is provided with two or three flow channels, the upper part of the mold barrel is provided with two or three feed ports, and the lower part of the mold barrel is provided with a discharge port. The lower part of the runner body is provided with a main flow channel communicating with the discharge port, and each flow channel converges at the upper end of the main flow channel. The blow molding machine with the above structure can only be used to process two-layer or three-layer plastic film tubes, but cannot produce five-layer plastic film tubes, which is difficult to meet the high-quality packaging requirements.

Contents of the invention

The technical problem to be solved by the present invention is to provide a multi-layer co-extrusion water-cooled blown film unit, which can improve product quality. The technical scheme adopted is as follows:

A multi-layer co-extrusion water-cooled blown film unit, including a frame, and a die head installed on the frame, an extruder, a cooling device, a molding device and a winding device, and a feed port of the extruder and the die head connection, the forming device and the winding device are all arranged under the die head, and the cooling device is arranged between the die head and the forming device, and it is characterized in that: the die head includes a layered mold core, a mold barrel, a runner body and a fixed seat, the runner body is set in the mold barrel, the layered mold core is set in the runner body, the fixed seat covers the upper end of the runner body and is locked on the mold barrel, and the upper part of the mold barrel is provided with five feeding ports, The bottom of the mold barrel is provided with a discharge port; the number of the extruders is five, and the extruders are connected to the feed ports one by one; The lower end of the main channel is connected to the upper end of the main channel, and the lower end of the main channel is connected to the discharge port; the channel body includes the first channel body, the second channel body, the third channel body, the Four channel bodies, fifth channel body; a first channel is provided between the first channel body and the second channel body, a second channel is provided between the second channel body and the third channel body, and a second channel is provided between the second channel body and the third channel body A third flow channel is provided between the third flow channel body and the fourth flow channel body, a fourth flow channel is provided between the fourth flow channel body and the fifth flow channel body, and the fifth flow channel body is connected to the mold barrel. A fifth flow channel is provided between the inner walls; the lower parts of the second flow channel and the fourth flow channel gradually approach the third flow channel from both sides, and the second flow channel, the third flow channel, and the fourth flow channel are in the secondary flow channel. The upper end of the first runner and the fifth runner gradually approach the secondary runner from both sides, and the first runner, the second runner, and the fifth runner meet at the upper end of the main runner; the cooling device includes air cooling Mechanism and water-cooling mechanism, the air-cooling mechanism is above the water-cooling mechanism.

By setting five extruders on the same level, setting five runners and five feed ports on the die, five layers of plastic film tubes can be produced; and by setting the secondary runners and main runners, the second flow The lower part of the channel and the fourth channel gradually approaches the third channel from both sides, and the second channel, the third channel, and the fourth channel meet at the upper end of the secondary channel, and the first channel and the fifth channel The lower part of the main channel gradually approaches the secondary flow channel from both sides, and the first flow channel, the secondary flow channel, and the fifth flow channel meet at the upper end of the main flow channel, that is, the five-layer film is formed in two steps from the inside to the outside, and the produced The five-layer plastic film tube is more distinct in structure level, which improves the quality of the five-layer plastic film tube; and the cooling device is set to include an air-cooling mechanism and a water-cooling mechanism, wherein the air-cooling mechanism is above the water-cooling mechanism, and the air-cooling mechanism mainly passes Breeze cools and preliminarily shapes the plastic film tube coming out of the die, making the shape of the plastic film tube stable and transparent. The water cooling mechanism uses immersion to rapidly cool and shape the plastic film tube to prevent the plastic film tube from being rewound by the rear The traction of the device is deformed, further improving the quality of the five-layer plastic film tube.

As a preferred solution of the present invention, the first flow channel, the second flow channel, the third flow channel, the fourth flow channel, and the fifth flow channel are respectively arranged on the first flow channel body, the second flow channel body, and the second flow channel body. Spiral grooves extending from top to bottom on the side walls of the third flow channel body, the fourth flow channel body and the fifth flow channel body. The first runner, the second runner, the third runner, the fourth runner, and the fifth runner are all spiral groove structures, which extend the length of the runner, increase the downward pulling force on the melted glue, and speed up the flow of the melted glue. speed.

As a further preferred solution of the present invention, the cross-sectional area of the spiral groove gradually decreases from top to bottom. The cross-sectional area of the spiral groove gradually decreases from top to bottom, so that more melted glue is stored in the upper part of the spiral groove, and the pressure on the melted glue in the lower part of the spiral groove is increased to further accelerate the flow of melted glue.

It is further preferred that among the above-mentioned five feeding ports, one is arranged on the top of the mold cylinder, and the other four are evenly arranged on the upper part of the side wall of the mold cylinder. The location of the feed inlet is convenient for the installation of the extruder, and the structure is more scientific and reasonable.

As a preferred solution of the present invention, the air cooling mechanism includes an air ring and a cooling fan, the air ring includes an annular air ring body, a cold air passage is arranged in the air ring body, and an annular air outlet is provided on the inner side wall of the air ring body, and the wind ring The outer wall of the ring body is provided with an air inlet, and the cooling fan is connected with the air inlet.

As a preferred solution of the present invention, the water cooling mechanism includes a water ring and a cooling water tank, the water ring includes an annular water ring body, a cold water channel is provided in the water ring body, and an annular water outlet is provided on the inner wall of the water ring body, and the water ring The outer wall of the body is provided with a water inlet, and the cooling water tank is connected with the water inlet.

As a preferred solution of the present invention, the forming device includes two V-shaped splints and two parallel traction rollers. There is a gap at the lower end of the two splints, and the traction roller is located below the gap. Two splints arranged in a V shape make the plastic film tube gradually gather at the lower end from a cylindrical tubular shape to a sheet shape. Under the traction of the traction roller, the thin plastic film tube passes through the gap, and at the same time, the two splints arranged in a V shape The splint also plays a role in squeezing the moisture generated by the water cooling mechanism on the plastic film tube.

In actual production, the plastic film tube coming out of the die cannot be absolutely uniform, and there are thick spots in some parts relative to other parts. The repeated superposition causes the surface of the whole roll of plastic film tube to be uneven after winding, which reduces the quality of the molded product. In order to solve the above problems, as a further preferred solution of the present invention, it also includes a rotating seat, a rotating shaft and a rotating shaft driving device, the rotating seat is installed on the frame through the rotating shaft, and the rotating shaft driving device is connected with the rotating shaft; the forming device and the winding device are mounted on swivel mounts. By controlling the slow rotation of the rotating seat, the forming device (including two traction rollers) and the winding device rotate with the rotating seat, and the positional relationship between the three remains unchanged, but the positional relationship between the upper end of the forming device and the die head is constantly changing. In this way, the thick points on the plastic film tube are evenly staggered along the axial direction of the traction roller (of the forming device), and on the winding shaft of the winding device, the thick points are also uniformly staggered along the axial direction, and the thick points will not be staggered at the same position. Multiple stacking makes the surface of the whole roll of plastic film tube even and smooth after winding, which improves product quality. It should be noted that the die head continuously extrudes a glassy plastic film tube with high plasticity. At the end of the die head, the plastic film tube is not fixed, so the rotation of the lower traction roller will not cause the plastic film tube to Twist into one strand. In addition, the rotating shaft driving device usually adopts a variable frequency speed regulating motor.

As a further preferred solution of the present invention, at least two splint adjustment mechanisms are provided on the outside of the splint, the splint adjustment mechanism includes a nut and a screw, the nut is installed on the frame, the screw is in the nut, and one end of the screw is connected to the splint. connect. By turning the screw, the inclination of the splint and the width of the gap are adjusted to meet the requirements of plastic film tubes of various thicknesses.

As a further preferred solution of the present invention, it also includes a drying device, a second traction roller and a third traction roller, the drying device is arranged between the traction roller and the winding device, and the second traction roller and the third traction roller are respectively arranged On the side of the drying unit. The second traction roller and the third traction roller keep the plastic film tube in a tensioned flat state, and adjust the angle of the plastic film tube during winding, and the drying device further dries off the moisture on the plastic film tube.

Description of drawings

Fig. 1 is a schematic structural view of a preferred embodiment of the present invention;

Fig. 2 is a sectional view along A-A of Fig. 1;

Fig. 3 is a sectional view along B-B of Fig. 1;

Fig. 4 is the structural representation of die head;

Fig. 5 is a sectional view along C-C of Fig. 4 .

Detailed ways

Further description will be given below in conjunction with the accompanying drawings and preferred embodiments of the present invention.

As shown in Figures 1 to 5, this multi-layer (five-layer) co-extrusion water-cooled blown film unit includes a frame 1, a die head 2 installed on the frame 1, five extruders 3, cooling Device 4, molding device 5, winding device 6, rotating seat 7, rotating shaft 8 and rotating shaft driving motor (revolving shaft driving motor is omitted in Fig. 1 to Fig. 3); extruder 3 is connected with the feeding port of die head 2, The forming device 5 and the winding device 6 are arranged under the die head 2, and the cooling device 4 is arranged between the die head 2 and the forming device 5; Transmission connection; the forming device 5 and the winding device 6 are installed on the rotating seat 7 .

The die head 2 includes a layered mold core 201, a mold barrel 202, a flow channel body 203 and a fixed seat 204. The flow channel body 203 is arranged in the mold barrel 202, the layered mold core 201 is arranged in the flow channel body 203, and the fixed seat 204 Covered on the upper end of the runner body 203 and locked on the mold barrel 202 by screws 205, the upper part of the mold barrel 202 is provided with five feed ports 206, and the lower part of the mold barrel 202 is provided with a discharge port 207; the extruder 3 One-to-one connection with the feed port 206; the lower part of the flow channel body 3 is provided with a secondary flow channel 208 and a main flow channel 209, the lower end of the secondary flow channel 208 is connected with the upper end of the main flow channel 209, and the lower end of the main flow channel 209 is connected with the discharge The ports 207 are connected; the flow channel body 203 includes a first flow channel body 2031, a second flow channel body 2032, a third flow channel body 2033, a fourth flow channel body 2034, and a fifth flow channel body 2035 arranged sequentially from inside to outside The first flow channel 2011 is provided between the first flow channel body 2031 and the second flow channel body 2032, the second flow channel 2012 is provided between the second flow channel body 2032 and the third flow channel body 2033, and the third flow channel body 2033 and the fourth channel body 2034 is provided with a third channel 2013, between the fourth channel body 2034 and the fifth channel body 2035 is provided with a fourth channel 2014, the fifth channel body 2035 and the mold barrel A fifth flow channel 2015 is provided between the inner walls of 202, and the first flow channel 2011, the second flow channel 2012, the third flow channel 2013, the fourth flow channel 2014, and the fifth flow channel 2015 are respectively arranged on the first flow channel body 2031 , the second flow channel body 2032, the third flow channel body 2033, the fourth flow channel body 2034, the fifth flow channel body 2035 side walls, the spiral groove 2016 extending from top to bottom, the cross-sectional area of the spiral groove 2016 is from gradually decreases from top to bottom; the bottom of the second flow channel 2012 and the fourth flow channel 2014 gradually approach the third flow channel 2013 from both sides, and the second flow channel 2012, the third flow channel 2013, and the fourth flow channel 2014 are in the The upper end of the secondary runner 208 meets; the bottom of the first runner 2011 and the fifth runner 2015 gradually approaches the secondary runner 208 from both sides, and the first runner 2011, the secondary runner 208, and the fifth runner 2015 are in the main channel. 209 meet at the upper end.

The cooling device 4 includes an air cooling mechanism 401 and a water cooling mechanism 402 , and the air cooling mechanism 401 is located above the water cooling mechanism 402 .

The air cooling mechanism 401 includes an air ring 4011 and a cooling fan 4012. The air ring 4011 includes an annular air ring body 40111. A cold air channel is arranged in the air ring body 40111. The inner wall of the air ring body 40111 is provided with an annular air outlet 40112. The air ring The outer wall of the body 40111 is provided with an air inlet 40113, and the cooling fan 4012 is connected with the air inlet 40113.

The water cooling mechanism 402 includes a water ring 4021 and a cooling water tank 4022. The water ring 4021 includes an annular water ring body 40211. A cold water channel is provided in the water ring body 40211. The inner wall of the water ring body 40211 is provided with an annular water outlet 40212. The water ring body The outer wall of 40211 is provided with a water inlet 40213, and the cooling water tank 4022 is connected with the water inlet 40213.

The molding device 5 includes two first traction rollers 501 arranged in parallel and two clamping plates 502 arranged in a V shape. There is a gap 503 at the lower end of the two clamping plates 502 , and the first traction roller 501 is located below the gap 503 . The outside of clamping plate 502 is provided with at least two clamping plate adjusting mechanisms 504, and clamping plate adjusting mechanism 504 comprises nut 5041 and screw rod 5042, and nut 5041 is installed on the frame 1, and screw rod 5042 is in nut 5041, and one end of screw rod 5042 is connected with clamping plate 502.

This multi-layer co-extrusion water-cooled blown film unit also includes a drying device 9, a second traction roll 10 and a third traction roll 11, the drying device 9 is arranged between the first traction roll 501 and the winding device 6, the second The second pulling roller 10 and the third pulling roller 11 are respectively arranged on one side of the drying device 9 .

By setting five extruders 3, five runners and five feed ports 206 are set on the die head 2, the plastic film tube of five layers can be produced; The lower part of the flow channel 2012 and the fourth flow channel 2014 gradually approaches the third flow channel 2013 from both sides, and the second flow channel 2012, the third flow channel 2013, and the fourth flow channel 2014 meet at the upper end of the secondary flow channel 208, The bottoms of the first runner 2011 and the fifth runner 2015 gradually approach the secondary runner 208 from both sides, and the first runner 2011, the secondary runner 208, and the fifth runner 2015 meet at the upper end of the main runner 209, that is five The layer of film is molded in two steps from the inside to the outside, and the five-layer plastic film tube produced is more distinct in structure, which improves the quality of the five-layer plastic film tube; and the cooling device 4 is set to include an air cooling mechanism 401 and a water cooling system. Mechanism 402, wherein the air-cooling mechanism 401 is located above the water-cooling mechanism 402, the air-cooling mechanism 401 mainly cools the plastic film tube coming out of the die head 2 through the breeze, so that the shape of the plastic film tube is stable, and the water-cooling mechanism 402 uses The water spray mode makes the plastic film tube cool and finalized rapidly, avoids the deformation of the plastic film tube being pulled by the rear winding device 6, and further improves the quality of the five-layer plastic film tube.

By controlling the rotating seat 7 to rotate at a slow speed, the forming device 5 and the winding device 6 rotate with the rotating seat 7, and the positional relationship among the three remains unchanged, but the positional relationship between the upper end of the forming device 5 and the die head 2 is constantly changing, thereby The thick spots on the plastic film tube are evenly staggered along the axial direction of the first traction roller 501 (of the forming device 5), and on the winding shaft of the winding device 6, the thick spots are also uniformly staggered along the axial direction, and the thick spots will not be in the same direction. The same position is superimposed multiple times, so that after winding, the surface of the whole roll of plastic film tube is even and smooth, which improves the product quality.

In addition, it should be noted that, in the specific embodiments described in this specification, the names of various parts may be different, and all equivalent or simple changes made according to the structure, features and principles described in the patent concept of the present invention include Within the protection scope of the patent of the present invention. Those skilled in the art to which the present invention belongs can make various modifications or supplements to the described specific embodiments or adopt similar methods to replace them, as long as they do not deviate from the structure of the present invention or exceed the scope defined in the claims. All should belong to the protection scope of the present invention.

Claims (5)

1. a multi-layer co-extruded water-cooling blow-molding film unit, comprise frame, and rack-mounted die head, extruder, cooling device, shaped device and wrap-up, extruder is connected with the charging aperture of die head, shaped device and wrap-up are all arranged on the below of die head, cooling device is arranged between die head and shaped device, it is characterized in that: also comprise rotating seat, rotating shaft and rotating shaft drive unit, rotating seat is arranged in described frame by rotating shaft, and rotating shaft drive unit is connected with rotating shaft transmission, described shaped device and wrap-up are installed on rotating seat, shaped device comprises two pieces of be in the shape of the letter V clamping plate and two carry-over pinch rolls be arranged in parallel of arranging, and there is gap the lower end of two clamping plates, and carry-over pinch rolls are in the below in gap, described die head comprises stratiform core rod, mould cylinder, runner body and holder, runner body is arranged in mould cylinder, and stratiform core rod is arranged in runner body, and holder covers the upper end of runner body and is locked on mould cylinder, the top of mould cylinder is provided with five charging apertures, and the bottom of mould cylinder is provided with discharging opening, the quantity of described extruder is five, and extruder and charging aperture connect one to one, the bottom of runner body is provided with secondary fluid course and sprue, and the lower end of secondary fluid course and the upper end of sprue are connected, and lower end and the discharging opening of sprue are connected, runner body comprises from interior first flow body, the second runner body, the 3rd runner body, the 4th runner body, the 5th runner body to setting gradually outward, first flow is provided with between first flow body and the second runner body, the second runner is provided with between second runner body and the 3rd runner body, the 3rd runner is provided with between 3rd runner body and the 4th runner body, the 4th runner is provided with between 4th runner body and the 5th runner body, the 5th runner is provided with between the inwall of the 5th runner body and described mould cylinder, first flow, second runner, 3rd runner, 4th runner, 5th runner is respectively and is arranged on described first flow body, second runner body, 3rd runner body, 4th runner body, on 5th runner body sidewall, the helicla flute from up to down extended, spiral fluted cross-sectional area from up to down reduces gradually, the bottom of the second runner and the 4th runner moves closer to the 3rd runner from both sides, and the second runner, the 3rd runner, the 4th runner are joined at the upper end of secondary fluid course, the bottom of first flow and the 5th runner moves closer to secondary fluid course from both sides, and first flow, secondary fluid course, the 5th runner are joined at the upper end of sprue, cooling device comprises air cooling mechanism and magnetism servo-electric motor water-cooling, and air cooling mechanism is in the top of magnetism servo-electric motor water-cooling.

2. multi-layer co-extruded water-cooling blow-molding film unit as claimed in claim 1, it is characterized in that: described air cooling mechanism comprises vane and cooling blower, vane comprises ring-type vane body, cold air duct is provided with in vane body, the madial wall of vane body is provided with annular air outlet, the lateral wall of vane body is provided with air inlet, and cooling blower is connected with air inlet.

3. multi-layer co-extruded water-cooling blow-molding film unit as claimed in claim 1, it is characterized in that: described magnetism servo-electric motor water-cooling comprises water ring and cooling water tank, water ring comprises ring-type water ring body, cold water channel is provided with in water ring body, the madial wall of water ring body is provided with circular outlets, the lateral wall of water ring body is provided with water inlet, and cooling water tank is connected with water inlet.

4. multi-layer co-extruded water-cooling blow-molding film unit as claimed in claim 1, it is characterized in that: the outside of described clamping plate is provided with at least two clamping plate governor motions, and clamping plate governor motion comprises nut and screw rod, and nut is arranged in described frame, screw rod is in nut, and one end of screw rod is connected with clamping plate.

5. multi-layer co-extruded water-cooling blow-molding film unit as claimed in claim 1, it is characterized in that: also comprise drying unit, the second carry-over pinch rolls and the 3rd carry-over pinch rolls, drying unit is arranged between carry-over pinch rolls and wrap-up, and the second carry-over pinch rolls and the 3rd carry-over pinch rolls are separately positioned on the side of drying unit.