PLA modified material extrusion molding production line

Abstract

The utility model relates to a PLA (polylactic acid) modified material extrusion molding production line, the production line mainly comprises a material mixing unit, an extrusion molding unit, a cooling unit and a material receiving and packaging unit, a discharge pipeline of the material mixing unit is connected with the extrusion molding unit, the cooling unit is arranged close to a discharge port of the extrusion molding unit, and the material receiving and packaging unit is connected with the cooling unit. The receiving and packaging unit is arranged at the rear end of the cooling unit; wherein the cooling unit comprises a cooling table, a plurality of sets of cooling devices are arranged on the cooling table in the direction of the production line, each set of cooling device is composed of a cooling liquid conduction cooling device and an air cooling device, and the cooling liquid conduction cooling device is arranged on the cooling table; the air cooling device is arranged above the cooling liquid conduction cooling device through the supporting legs, and the air cooling device and the cooling liquid conduction cooling device are used for cooperatively cooling the extruded and molded PLA modified material, so that the cooling effect is good, and the cost is low.

Description

Technical Field

[0001] The utility model belongs to the technical field of material processing equipment, and specifically relates to a PLA modified material extrusion molding production line. Technical Background

[0002] Polylactic acid (PLA) plastic is a biodegradable plastic. It is made into a variety of products using polylactic acid raw material pellets through various general plastic processing techniques, such as blow molding, vacuum molding, injection molding, etc. Its application fields are becoming more and more extensive.

[0003] Although pure PLA has high hardness and strong rigidity, it has poor toughness and is brittle. Therefore, other biodegradable materials such as PBAT, PCL and additives must be used to modify PLA to form PLA modified materials, which are then extruded, cooled and sheared into PLA modified material particles (commonly known as plastic rice). PLA modified material particles can be further processed into a series of products, such as disposable tableware.

[0004] However, the processing of PLA is particularly sensitive to water content. Therefore, PLA modified materials must be cooled by non-direct water bath during extrusion processing. This cooling method can be used to cool PLA modified materials, thereby improving the quality of products based on the modified materials.

[0005] In view of the above cooling method, the utility model proposes a PLA modified material extrusion molding production line based on a cooling method not directly using a water bath. Utility Model Content

[0006] Aiming at the fact that a direct water bath cooling method cannot be used for PLA modified materials, the utility model provides a PLA modified material extrusion molding production line based on the cooling method.

[0007] The utility model is realized by the following technical scheme: the PLA modified material extrusion molding production line is mainly composed of a mixing unit, an extrusion molding unit, a cooling unit and a material receiving and packaging unit, wherein the material discharging pipe of the mixing unit is connected to the extrusion molding unit, a cooling unit is arranged near the material discharging port of the extrusion molding unit, and a material receiving and packaging unit is arranged at the rear end of the cooling unit. Among them:

[0008] (i) The mixing unit is composed of a stirring device, which includes a stirring tank, a rotating rod arranged in the stirring tank, and stirring blades arranged on the rotating rod, and the rotating rod is connected to the output shaft of the motor.

[0009] In addition, a dust collecting port is provided on the discharge pipe, and a dust collecting hood is provided above the dust collecting port. The dust collecting hood is connected to the pulse purification dust collector through a contraction tube.

[0010] (ii) The extrusion molding unit is a screw extruder.

[0011] (III) The material receiving and packaging unit is mainly composed of a pelletizer and a storage bin, which are connected by a conveying pipeline, and a discharge port is provided at the bottom of the storage bin.

[0012] The structural feature of the utility model is that the cooling unit includes a cooling table, on which a plurality of groups of cooling devices are arranged along the production line direction, each group of cooling devices is composed of a coolant conduction cooling device and an air cooling device, and the coolant conduction cooling device is arranged on the cooling table, and the air cooling device is arranged above the coolant conduction cooling device through a support leg, and the air cooling device and the coolant conduction cooling device synergistically cool the PLA modified material after extrusion molding.

[0013] As a specific technical solution, the coolant conduction cooling device includes an S-shaped heat conduction metal pipe, the inlet end of the S-shaped heat conduction metal pipe is connected to the outlet end of the pipe body for transmitting the coolant, so that the S-shaped heat conduction metal pipe is filled with coolant, and the outlet end of the S-shaped heat conduction metal pipe is connected to the inlet end of the drain pipe. In a specific implementation, the S-shaped heat conduction metal pipe is made of stainless steel or aluminum alloy, and the coolant is tap water.

[0014] As a specific technical solution, the air cooling device adopts a cooling fan.

[0015] The beneficial effects achieved by the utility model are as follows: the utility model adopts an air cooling device and a coolant conduction cooling device to collaboratively cool the PLA modified material after extrusion molding, so that when the PLA modified material particles are processed into a series of products, the moisture content meets the downstream processing technology and quality requirements of the products based on the PLA modified material, and the product quality is uniform and stable. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the PLA modified material extrusion molding production line.

[0017] Figure 2 It is a schematic diagram of an S-shaped heat conduction metal tube. DETAILED DESCRIPTION

[0018] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention clearer and more understandable, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0019] Please also refer to the attached Figure 1-2The PLA modified material extrusion molding production line described in the utility model is mainly composed of a mixing unit 1, an extrusion molding unit 2, a cooling unit 3 and a material receiving and packaging unit 4, wherein the discharge pipe of the mixing unit 1 is connected to the extrusion molding unit 2, the cooling unit 3 is arranged near the discharge port of the extrusion molding unit, and the material receiving and packaging unit 4 is arranged at the rear end of the cooling unit.

[0020] As a specific implementation, the mixing unit is composed of a stirring device, which includes a stirring tank 11, a rotating rod arranged in the stirring tank, and stirring blades arranged on the rotating rod, and the rotating rod is connected to the output shaft of the motor 12. Specifically, existing stirring equipment can be used as the stirring device.

[0021] In addition, a dust collecting port 13 is provided on the discharge pipe, and a dust collecting cover 14 is provided above the dust collecting port 13. The dust collecting cover 14 is connected to a pulse cleaning dust collector 15 through a shrink tube. Specifically, the pulse cleaning dust collector 15 is purchased from commercially available equipment.

[0022] As a specific implementation, the extrusion molding unit is a screw extruder 21, which is purchased from commercially available equipment. Those skilled in the art can select a single-screw extruder or a twin-screw extruder according to needs.

[0023] As a specific implementation, the material receiving and packaging unit is mainly composed of a pelletizer and a storage bin, which are connected by a conveying pipeline, and a discharge port is provided at the bottom of the storage bin.

[0024] On the basis of the above implementation, the utility model provides a new cooling method for PLA modified materials that cannot be cooled by direct water bath, and is implemented in the following ways:

[0025] The cooling unit 3 includes a cooling table 31, on which several groups of cooling devices are arranged along the production line direction, each group of cooling devices is composed of a coolant conduction cooling device 32 and a wind cooling device 33, and the coolant conduction cooling device 32 is arranged on the cooling table 31, and the wind cooling device 33 is arranged above the coolant conduction cooling device through a support leg 34.

[0026] Specifically, the coolant conduction cooling device includes an S-shaped heat conduction metal pipe, the inlet end of the S-shaped heat conduction metal pipe is connected to the outlet end of the pipe body for transmitting the coolant, so that the S-shaped heat conduction metal pipe is filled with coolant, and the outlet end of the S-shaped heat conduction metal pipe is connected to the inlet end of the drain pipe. In a specific implementation, the S-shaped heat conduction metal pipe is made of stainless steel or aluminum alloy, and the coolant is tap water.

[0027] Specifically, the wind cooling device adopts a cooling fan.

[0028] During production, after the PLA modified material is extruded and formed by the screw extruder 21, it enters the cooling unit 3 through the drafting of the guide roller group 22 and 23, and then the air cooling device 33 and the coolant conduction cooling device 32 perform coordinated cooling on the PLA modified material after extrusion. The PLA modified material after extrusion is coordinated cooled by the air cooling device and the coolant conduction cooling device to ensure that the moisture content of the PLA modified material particles meets the downstream product processing technology and quality requirements based on the PLA modified material, and the product quality is uniform and stable.

[0029] The above description shows and describes the preferred embodiments of the utility model. As mentioned above, it should be understood that the utility model is not limited to the form disclosed herein, and should not be regarded as excluding other embodiments, but can be used in various other combinations, modifications and environments, and can be modified within the scope of the utility model concept described herein through the above teachings or the technology or knowledge of the relevant field. The changes and modifications made by those skilled in the art do not depart from the spirit and scope of the utility model, and should be within the scope of protection of the claims attached to the utility model.

Claims

1. PLA modified material extrusion molding production line, characterized by: The production line is mainly composed of a mixing unit, an extrusion molding unit, a cooling unit and a material receiving and packaging unit, wherein the discharge pipe of the mixing unit is connected to the extrusion molding unit, a cooling unit is arranged near the discharge port of the extrusion molding unit, and a material receiving and packaging unit is arranged at the rear end of the cooling unit; wherein the cooling unit comprises a cooling table, on which a plurality of groups of cooling devices are arranged along the production line direction, each group of cooling devices is composed of a coolant conduction cooling device and an air cooling device, and the coolant conduction cooling device is arranged on the cooling table, and the air cooling device is arranged above the coolant conduction cooling device through a support leg, and the air cooling device and the coolant conduction cooling device synergistically cool the PLA modified material after extrusion molding.

2. The PLA modified material extrusion molding production line according to claim 1, characterized in that: The coolant conduction cooling device includes an S-shaped heat conduction metal tube, the inlet end of the S-shaped heat conduction metal tube is connected to the outlet end of the tube body for conveying the coolant, so that the S-shaped heat conduction metal tube is filled with coolant, and the outlet end of the S-shaped heat conduction metal tube is connected to the inlet end of the drain pipe.

3. The PLA modified material extrusion molding production line according to claim 2, characterized in that: The coolant is tap water.

4. The PLA modified material extrusion molding production line according to claim 2, characterized in that: The S-shaped heat conduction metal tube is made of stainless steel or aluminum alloy.

5. The PLA modified material extrusion molding production line according to claim 1, characterized in that: The air cooling device adopts a cooling fan.

6. The PLA modified material extrusion molding production line according to any one of claims 1 to 5, characterized in that: The mixing unit is composed of a stirring device, which includes a stirring tank, a rotating rod arranged in the stirring tank, and stirring blades arranged on the rotating rod. The rotating rod is connected to the output shaft of the motor.

7. The PLA modified material extrusion molding production line according to claim 6, characterized in that: A dust collecting port is also provided on the discharge pipe, and a dust collecting hood is provided above the dust collecting port. The dust collecting hood is connected to the pulse purification dust collector through a contraction tube.

8. The PLA modified material extrusion molding production line according to any one of claims 1 to 5, characterized in that: The extrusion molding unit is a screw extruder.

9. The PLA modified material extrusion molding production line according to any one of claims 1 to 5, characterized in that: The material receiving and packaging unit is mainly composed of a pelletizer and a storage bin, which are connected by a conveying pipeline, and a discharge port is arranged at the bottom of the storage bin.

Images