A PBAT fully degradable modified material and preparation method thereof

Abstract

The present invention discloses a PBAT fully degradable modified material and a preparation method thereof, wherein the PBAT fully degradable modified material comprises the following raw materials in parts by weight: PBAT, calcium carbonate, lubricant, compatibilizer, and antioxidant. The PBAT fully degradable modified material prepared by the present invention can be completely degraded in the natural environment without being degraded in a special environment, so it will not remain in the soil to cause pollution. In addition, the PBAT fully degradable modified material is a material for energy saving and emission reduction, which can reduce CO 2 The emission volume is reduced, and the raw materials do not use water. In the production process, the raw materials are transported in closed pipelines, so there will be no secondary pollution problems such as air pollution, wastewater pollution and industrial waste in the production process. The related products made of this material have good physical properties and mechanical strength, and can meet the use needs of different fields.

Description

Technical Field

[0001] The present invention relates to the technical field of fully degradable materials, and in particular to a PBAT fully degradable modified material and a preparation method thereof. Background Art

[0002] To date, plastic products have occupied the top three of human waste production. If such a large amount of plastic waste cannot be properly recycled or treated, it will pose a very serious threat to the human living environment. The existing technology in China's degradable plastics basically contains PLA (polylactic acid). Although PLA is a biodegradable plastic, it cannot be degraded under natural conditions, and some plastic particles will still remain after degradation. Therefore, mainstream countries in the world are gradually phasing out PLA, and its residues will pollute the soil. In addition, its degradable materials will derive secondary pollution problems such as air pollution, wastewater pollution and industrial waste during the production process, which cannot meet the use needs. In summary, this application proposes a PBAT fully degradable modified material and a preparation method thereof. Summary of the invention

[0003] Based on the technical problems existing in the background technology, the present invention proposes a PBAT fully degradable modified material and a preparation method thereof.

[0004] The present invention provides a PBAT fully degradable modified material, which comprises the following raw materials in parts by weight: 50-60 parts of PBAT, 35-45 parts of calcium carbonate, 2.5-7.5 parts of lubricant, 1.5-4.5 parts of compatibilizer, and 0.5-1.5 parts of antioxidant, wherein PBAT is one of polyadipate or polybutylene terephthalate.

[0005] Preferably, the following raw materials are included in parts by weight: 53 parts of PBAT, 38 parts of calcium carbonate, 4.5 parts of lubricant, 3 parts of compatibilizer, and 1.5 parts of antioxidant.

[0006] Preferably, the following raw materials are included in parts by weight: 50 parts of PBAT, 40 parts of calcium carbonate, 4.5 parts of lubricant, 4.5 parts of compatibilizer, and 1 part of antioxidant.

[0007] Preferably, the following raw materials are included in parts by weight: 60 parts of PBAT, 35.5 parts of calcium carbonate, 2.5 parts of lubricant, 1.5 parts of compatibilizer, and 0.5 parts of antioxidant.

[0008] Preferably, the lubricant is wax powder, zinc stearate, erucamide, or a mixture of more than one thereof;

[0009] The compatibilizer is one or a mixture of more than one of polyamide epoxy, polyurethane, and polycarbonate;

[0010] The antioxidant is one of phosphites and hindered amines or a mixture of more than one of them.

[0011] The present invention also proposes a method for preparing a PBAT fully degradable modified material, comprising the following steps:

[0012] S1: 2.5-7.5 parts of lubricant, 1.5-4.5 parts of compatibilizer, and 0.5-1.5 parts of antioxidant are placed in a blender and stirred at room temperature for 20-35 minutes to mix evenly;

[0013] S2: 50-60 parts of PBAT and 35-45 parts of calcium carbonate are selected and put into the corresponding feeding bins on the loss-in-weight weighing scale, and the mixture in S1 is put into the feeding bin on another loss-in-weight weighing scale;

[0014] S3: The loss-in-weight weighing scale weighs and measures the raw materials in the corresponding feeding bin, and then feeds them into the twin-screw extruder after weighing and measuring, wherein calcium carbonate is fed into the twin-screw extruder via a side feeder;

[0015] S4: The twin-screw extruder conveys, compresses, melts, shears and mixes the materials inside in sequence through a special screw combination;

[0016] S5: The twin-screw extruder extrude the uniformly compatible mixed material into an air-cooled stranding machine for air cooling. The air-cooled material is discharged from the air-cooled stranding machine and then enters a pelletizer for pelletizing. The pelletized material is introduced into a vibrating screen for screening.

[0017] S6: The material screened in S5 is introduced into a packaging machine for packaging, and finally PBAT fully degradable modified materials are produced.

[0018] Preferably, in S2, each production line has 3 groups of feeding bins and 3 groups of loss-in-weight weighing scales, the flow range of the loss-in-weight weighing scales is 10 to 550 Kg / h, and the normal flow rate is 100 to 500 Kg / h.

[0019] Preferably, in S4, the twin-screw extruder is a 75D co-rotating parallel twin-screw extruder, with a production capacity of 200-700 kg / hour, a twin-screw diameter of Φ72 mm, an aspect ratio of 44:1 or 48:1, a main motor power of 250 KW, a screw speed of 50-600 rpm, and an operating temperature inside the twin-screw extruder of 90-160 ° C.

[0020] The two screws of the twin-screw extruder rotate in parallel and in the same direction, meshing with each other, with good self-cleaning properties and narrow material residence time distribution; the screws are designed using the combined building block principle, combining conventional and special screw components with different functions to meet the needs of many complex process requirements; the screw configuration of this machine is designed for the above material process requirements and output optimization and has the following characteristics:

[0021] (1) Conveying components: Conveying components with different pitches and rotation directions produce different conveying, compression, residence time and pressure building effects on materials;

[0022] (2) Meshing components: Meshing components with different angles, thicknesses and numbers of pieces provide different shearing, mixing, retention and other effects on the material.

[0023] Preferably, in S3, the side feeder adopts volumetric metering, the motor power on the side feeder is 2.2kW, and the side feeder is provided with a feeding screw and a feeding barrel. The surface of the feeding screw is polished to reach a mirror surface to ensure that the material does not stick to the screw and improve the uniformity of feeding. The speed of the feeding screw is 50-600rpm, and a hopper is provided at the opening of the feeding barrel. The hopper is 120L, and the hopper is connected to a receiving box. The receiving box has a horizontal stirring, and the power of the stirring motor of the horizontal stirring is 1.1kW.

[0024] Preferably, in S5, the air-cooled drawing machine is provided with a stainless steel air-cooled conveyor belt, which has a length of 30m and a width of 400mm.

[0025] Compared with the prior art, the present invention has the following beneficial effects:

[0026] The PBAT fully degradable modified material prepared by the present invention can be completely degraded in the natural environment without being degraded in a special environment, so it will not remain in the soil to cause pollution. In addition, the PBAT fully degradable modified material is a material for energy saving and emission reduction, which can reduce CO 2 The emission volume is reduced, and the raw materials do not use water. In the production process, the raw materials are transported in closed pipelines, so there will be no secondary pollution problems such as air pollution, wastewater pollution and industrial waste in the production process. The related products made of this material have good physical properties and mechanical strength, and can meet the use needs of different fields. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 The present invention provides a flow chart of a method for preparing a fully degradable modified PBAT material. DETAILED DESCRIPTION

[0028] The present invention will be further explained below in conjunction with specific embodiments.

[0029] Embodiment 1

[0030] Reference Figure 1 This embodiment proposes a PBAT fully degradable modified material, including the following raw materials in parts by weight: 53 parts of PBAT, 38 parts of calcium carbonate, 4.5 parts of lubricant, 3 parts of compatibilizer, and 1.5 parts of antioxidant, wherein PBAT is one of polyadipate or polybutylene terephthalate, the lubricant is one of wax powder, zinc stearate, and erucic acid amide, or a mixture of more than one; the compatibilizer is one of polyamide epoxide, polyurethane, and polycarbonate, or a mixture of more than one; the antioxidant is one of phosphites and hindered amines, or a mixture of more than one;

[0031] The preparation method thereof comprises the following steps:

[0032] S1: 4.5 parts of lubricant, 3 parts of compatibilizer, and 1.5 parts of antioxidant are placed in a blender and stirred at room temperature for 20 minutes to mix evenly;

[0033] S2: 53 parts of PBAT and 38 parts of calcium carbonate are selected and put into the corresponding feeding bins on the loss-in-weight metering scales, and the mixture in S1 is put into the feeding bin on another loss-in-weight metering scale. Each production line has 3 groups of feeding bins and 3 groups of loss-in-weight metering scales. The flow range of the loss-in-weight metering scales is 10-550Kg / h, and the normal flow rate is 100-500Kg / h;

[0034] S3: The loss-in-weight weighing scale weighs and measures the raw materials in the corresponding feeding bin, and then feeds them into the twin-screw extruder after weighing and measuring, wherein calcium carbonate is fed into the twin-screw extruder via a side feeder;

[0035] The side feeder adopts volumetric metering. The motor power of the side feeder is 2.2kW. The side feeder is equipped with a feeding screw and a feeding barrel. The surface of the feeding screw is polished to a mirror surface to ensure that the material does not stick to the screw and improve the uniformity of feeding. The speed of the feeding screw is 50rpm. A hopper is set at the opening of the feeding barrel. The hopper is 120L. The hopper is connected to a receiving box with a horizontal stirring in the receiving box. The power of the stirring motor of the horizontal stirring is 1.1kW.

[0036] S4: The twin-screw extruder conveys, compresses, melts, shears and mixes the materials inside in sequence through a special screw combination;

[0037] The twin-screw extruder is a 75D co-rotating parallel twin-screw extruder with a production capacity of 200kg / hour, a twin-screw diameter of Ф72mm, an aspect ratio of 44:1, a main motor power of 250KW, a screw speed of 50rpm, and an operating temperature inside the twin-screw extruder of 100℃.

[0038] In addition, the two screws of the twin-screw extruder rotate in parallel and in the same direction, meshing with each other, with good self-cleaning properties and narrow distribution of material residence time. The screws are designed using the combined building block principle, combining conventional and special screw components with different functions to meet the needs of many complex process steps.

[0039] In addition, the screw configuration has the following characteristics according to the material process requirements and output optimization design of this application:

[0040] (1) Conveying components: Conveying components with different pitches and rotation directions produce different conveying, compression, residence time and pressure building effects on materials;

[0041] (2) Meshing components: Meshing components with different angles, thicknesses and numbers of pieces provide different shearing, mixing, retention and other effects on the materials;

[0042] S5: The twin-screw extruder extrude the uniformly compatible mixed material into an air-cooled stranding machine for air cooling. The air-cooled material is discharged from the air-cooled stranding machine and then enters a pelletizer for pelletizing. The pelletized material is introduced into a vibrating screen for screening.

[0043] The air-cooled drawing machine is equipped with a stainless steel air-cooled conveyor belt with a length of 30m and a width of 400mm;

[0044] The pelletizer is a gantry pelletizer, which is equipped with a strand pelletizer head, with a power of 7.5kW, and the material of the cutter is an alloy knife specially used for elastomers;

[0045] The vibrating screen is a stainless steel vibrating screen with three layers and a screen surface of 1m 2 , the mesh diameter is 6mm for the upper layer and 2mm for the lower layer, the lower layer is two layers, and there are two vibration motors on the vibrating screen, and its power is 0.25kW;

[0046] S6: The material screened in S5 is introduced into a packaging machine for packaging, and finally a PBAT fully degradable modified material is produced. The produced PBAT fully degradable modified material does not contain 6P plastic, EVA and PLA (polylactic acid) that cannot be degraded under natural environmental conditions.

[0047] Embodiment 2

[0048] Reference Figure 1This embodiment proposes a PBAT fully degradable modified material, including the following raw materials in parts by weight: 50 parts of PBAT, 40 parts of calcium carbonate, 4.5 parts of lubricant, 4.5 parts of compatibilizer, and 1 part of antioxidant, wherein PBAT is one of polyadipate or polybutylene terephthalate, the lubricant is one of wax powder, zinc stearate, and erucic acid amide, or a mixture of more than one; the compatibilizer is one of polyamide epoxide, polyurethane, and polycarbonate, or a mixture of more than one; the antioxidant is one of phosphites and hindered amines, or a mixture of more than one;

[0049] The preparation method thereof comprises the following steps:

[0050] S1: 4.5 parts of lubricant, 4.5 parts of compatibilizer and 1 part of antioxidant were put into a blender and stirred at room temperature for 30 minutes to mix evenly;

[0051] S2: Select 50 parts of PBAT and 40 parts of calcium carbonate and put them into the corresponding feeding bins on the loss-in-weight weighing scales. At the same time, put the mixture in S1 into the feeding bin on another loss-in-weight weighing scale. Each production line has 3 groups of feeding bins and 3 groups of loss-in-weight weighing scales. The flow range of the loss-in-weight weighing scales is 10-550Kg / h, and the normal flow rate is 100-500Kg / h.

[0052] S3: The loss-in-weight weighing scale weighs and measures the raw materials in the corresponding feeding bin, and then feeds them into the twin-screw extruder after weighing and measuring, wherein calcium carbonate is fed into the twin-screw extruder via a side feeder;

[0053] The side feeder adopts volumetric metering. The motor power of the side feeder is 2.2kW. The side feeder is equipped with a feeding screw and a feeding barrel. The surface of the feeding screw is polished to a mirror surface to ensure that the material does not stick to the screw and improve the uniformity of feeding. The speed of the feeding screw is 300rpm. A hopper is set at the opening of the feeding barrel. The hopper is 120L. The hopper is connected to a receiving box with a horizontal stirring in the receiving box. The power of the stirring motor of the horizontal stirring is 1.1kW.

[0054] S4: The twin-screw extruder conveys, compresses, melts, shears and mixes the materials inside in sequence through a special screw combination;

[0055] The twin-screw extruder is a 75D co-rotating parallel twin-screw extruder with a production capacity of 500kg / hour, a twin-screw diameter of Ф72mm, an aspect ratio of 44:1, a main motor power of 250KW, a screw speed of 600rpm, and an operating temperature of 140℃ inside the twin-screw extruder;

[0056] In addition, the two screws of the twin-screw extruder rotate in parallel and in the same direction, meshing with each other, with good self-cleaning properties and narrow distribution of material residence time. The screws are designed using the combined building block principle, combining conventional and special screw components with different functions to meet the needs of many complex process steps.

[0057] In addition, the screw configuration has the following characteristics according to the material process requirements and output optimization design of this application:

[0058] (1) Conveying components: Conveying components with different pitches and rotation directions produce different conveying, compression, residence time and pressure building effects on materials;

[0059] (2) Meshing components: Meshing components with different angles, thicknesses and numbers of pieces provide different shearing, mixing, retention and other effects on the materials;

[0060] S5: The twin-screw extruder extrude the uniformly compatible mixed material into an air-cooled stranding machine for air cooling. The air-cooled material is discharged from the air-cooled stranding machine and then enters a pelletizer for pelletizing. The pelletized material is introduced into a vibrating screen for screening.

[0061] The air-cooled drawing machine is equipped with a stainless steel air-cooled conveyor belt with a length of 30m and a width of 400mm;

[0062] The pelletizer is a gantry pelletizer, which is equipped with a strand pelletizer head, with a power of 7.5kW, and the material of the cutter is an alloy knife specially used for elastomers;

[0063] The vibrating screen is a stainless steel vibrating screen with three layers and a screen surface of 1m 2 , the mesh diameter is 6mm for the upper layer and 2mm for the lower layer, the lower layer is two layers, and there are two vibration motors on the vibrating screen, and its power is 0.25kW;

[0064] S6: The material screened in S5 is introduced into a packaging machine for packaging, and finally a PBAT fully degradable modified material is produced. The produced PBAT fully degradable modified material does not contain 6P plastic, EVA and PLA (polylactic acid) that cannot be degraded under natural environmental conditions.

[0065] Embodiment 3

[0066] Reference Figure 1This embodiment proposes a PBAT fully degradable modified material, including the following raw materials in parts by weight: 60 parts of PBAT, 35.5 parts of calcium carbonate, 2.5 parts of lubricant, 1.5 parts of compatibilizer, and 0.5 parts of antioxidant, wherein PBAT is one of polyadipate or polybutylene terephthalate, the lubricant is one of wax powder, zinc stearate, and erucic acid amide or a mixture of more than one; the compatibilizer is one of polyamide epoxide, polyurethane, and polycarbonate or a mixture of more than one; the antioxidant is one of phosphites and hindered amines or a mixture of more than one;

[0067] The preparation method thereof comprises the following steps:

[0068] S1: 2.5 parts of lubricant, 1.5 parts of compatibilizer, and 0.5 parts of antioxidant are placed in a blender and stirred at room temperature for 30 minutes to mix evenly;

[0069] S2: Select 60 parts of PBAT and 35.5 parts of calcium carbonate and put them into the corresponding feeding bins on the loss-in-weight metering scales. At the same time, put the mixture in S1 into the feeding bin on another loss-in-weight metering scale. Each production line has 3 groups of feeding bins and 3 groups of loss-in-weight metering scales. The flow range of the loss-in-weight metering scales is 10-550Kg / h, and the normal flow rate is 100-500Kg / h.

[0070] S3: The loss-in-weight weighing scale weighs and measures the raw materials in the corresponding feeding bin, and then feeds them into the twin-screw extruder after weighing and measuring, wherein calcium carbonate is fed into the twin-screw extruder via a side feeder;

[0071] The side feeder adopts volumetric metering. The motor power of the side feeder is 2.2kW. The side feeder is equipped with a feeding screw and a feeding barrel. The surface of the feeding screw is polished to a mirror surface to ensure that the material does not stick to the screw and improve the uniformity of feeding. The speed of the feeding screw is 600rpm. A hopper is set at the opening of the feeding barrel. The hopper is 120L. The hopper is connected to a receiving box with a horizontal stirring in the receiving box. The power of the stirring motor of the horizontal stirring is 1.1kW.

[0072] S4: The twin-screw extruder conveys, compresses, melts, shears and mixes the materials inside in sequence through a special screw combination;

[0073] The twin-screw extruder is a 75D co-rotating parallel twin-screw extruder with a production capacity of 700kg / hour, a twin-screw diameter of Ф72mm, an aspect ratio of 48:1, a main motor power of 250KW, a screw speed of 50-600rpm, and an operating temperature of 160℃ inside the twin-screw extruder;

[0074] In addition, the two screws of the twin-screw extruder rotate in parallel and in the same direction, meshing with each other, with good self-cleaning properties and narrow distribution of material residence time. The screws are designed using the combined building block principle, combining conventional and special screw components with different functions to meet the needs of many complex process steps.

[0075] In addition, the screw configuration has the following characteristics according to the material process requirements and output optimization design of this application:

[0076] (1) Conveying components: Conveying components with different pitches and rotation directions produce different conveying, compression, residence time and pressure building effects on materials;

[0077] (2) Meshing components: Meshing components with different angles, thicknesses and numbers of pieces provide different shearing, mixing, retention and other effects on the materials;

[0078] S5: The twin-screw extruder extrude the uniformly compatible mixed material into an air-cooled stranding machine for air cooling. The air-cooled material is discharged from the air-cooled stranding machine and then enters a pelletizer for pelletizing. The pelletized material is introduced into a vibrating screen for screening.

[0079] The air-cooled drawing machine is equipped with a stainless steel air-cooled conveyor belt with a length of 30m and a width of 400mm;

[0080] The pelletizer is a gantry pelletizer, which is equipped with a strand pelletizer head, with a power of 7.5kW, and the material of the cutter is an alloy knife specially used for elastomers;

[0081] The vibrating screen is a stainless steel vibrating screen with three layers and a screen surface of 1m 2 , the mesh diameter is 6mm for the upper layer and 2mm for the lower layer, the lower layer is two layers, and there are two vibration motors on the vibrating screen, and its power is 0.25kW;

[0082] S6: The material screened in S5 is introduced into a packaging machine for packaging, and finally a PBAT fully degradable modified material is produced. The produced PBAT fully degradable modified material does not contain 6P plastic, EVA and PLA (polylactic acid) that cannot be degraded under natural environmental conditions.

[0083] The PBAT fully degradable modified materials prepared in Examples 1 to 3 were compared with conventional degradable materials, and the experimental data are shown in the following table:

[0084]

[0085] It can be seen from the above table that the degradation effect of the PBAT fully degradable modified material proposed in the present invention is significantly improved, there is no residue after degradation, and it is easy to process.

[0086] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A PBAT fully degradable modified material, characterized in that: The invention comprises the following raw materials in parts by weight: 50-60 parts of PBAT, 35-45 parts of calcium carbonate, 2.5-7.5 parts of lubricant, 1.5-4.5 parts of compatibilizer and 0.5-1.5 parts of antioxidant.

2. A PBAT fully degradable modified material according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 53 parts of PBAT, 38 parts of calcium carbonate, 4.5 parts of lubricant, 3 parts of compatibilizer and 1.5 parts of antioxidant.

3. A PBAT fully degradable modified material according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 50 parts of PBAT, 40 parts of calcium carbonate, 4.5 parts of lubricant, 4.5 parts of compatibilizer and 1 part of antioxidant.

4. A PBAT fully degradable modified material according to claim 1, characterized in that: The invention comprises the following raw materials in parts by weight: 60 parts of PBAT, 35.5 parts of calcium carbonate, 2.5 parts of lubricant, 1.5 parts of compatibilizer and 0.5 parts of antioxidant.

5. A PBAT fully degradable modified material according to claim 1, characterized in that: The lubricant is wax powder, zinc stearate, erucic acid amide, or a mixture of more than one of them; The compatibilizer is one or a mixture of more than one of polyamide epoxy, polyurethane, and polycarbonate; The antioxidant is one of phosphites and hindered amines or a mixture of more than one of them.

6. A method for preparing a fully degradable modified PBAT material, characterized in that: The following steps are involved: S1: 2.5-7.5 parts of lubricant, 1.5-4.5 parts of compatibilizer, and 0.5-1.5 parts of antioxidant are placed in a blender and stirred at room temperature for 20-35 minutes to mix evenly; S2: 50-60 parts of PBAT and 35-45 parts of calcium carbonate are selected and put into the corresponding feeding bins on the loss-in-weight weighing scale, and the mixture in S1 is put into the feeding bin on another loss-in-weight weighing scale; S3: The loss-in-weight weighing scale weighs and measures the raw materials in the corresponding feeding bin, and then feeds them into the twin-screw extruder after weighing and measuring, wherein calcium carbonate is fed into the twin-screw extruder via a side feeder; S4: The twin-screw extruder conveys, compresses, melts, shears and mixes the materials inside in sequence through a special screw combination; S5: The twin-screw extruder extrude the uniformly compatible mixed material into an air-cooled stranding machine for air cooling. The air-cooled material is discharged from the air-cooled stranding machine and then enters a pelletizer for pelletizing. The pelletized material is introduced into a vibrating screen for screening. S6: The material screened in S5 is introduced into a packaging machine for packaging, and finally PBAT fully degradable modified materials are produced.

7. The method for preparing a fully degradable modified PBAT material according to claim 6, characterized in that: In S2, the flow rate range of the loss-in-weight metering scale is 10-550 Kg / h, and the normal flow rate is 100-500 Kg / h.

8. The method for preparing a fully degradable modified PBAT material according to claim 6, characterized in that: In the S4, the twin-screw extruder is a 75D co-rotating parallel twin-screw extruder with a production capacity of 200 to 700 kg / hour, a twin-screw diameter of Φ72 mm, an aspect ratio of 44:1 or 48:1, a main motor power of 250 KW, a screw speed of 50 to 600 rpm, and an operating temperature inside the twin-screw extruder of 90 to 160 °C.

9. The method for preparing a fully degradable modified PBAT material according to claim 6, characterized in that: In S3, the side feeder adopts volumetric metering, the motor power on the side feeder is 2.2kW, and the side feeder is provided with a feeding screw and a feeding barrel. The surface of the feeding screw is polished to a mirror surface to ensure that the material does not stick to the screw and improve the uniformity of feeding. The speed of the feeding screw is 50-600rpm, and a hopper is provided at the opening of the feeding barrel. The hopper is 120L, and the hopper is connected to a receiving box. The receiving box has a horizontal stirring, and the power of the stirring motor of the horizontal stirring is 1.1kW.

10. The method for preparing a fully degradable modified PBAT material according to claim 6, characterized in that: In S5, the air-cooled drawing machine is provided with a stainless steel air-cooled conveyor belt, which has a length of 30m and a width of 400mm.

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