CN109228061B - Rubber tube film-covering forming process - Google Patents
Rubber tube film-covering forming process Download PDFInfo
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- CN109228061B CN109228061B CN201811160116.6A CN201811160116A CN109228061B CN 109228061 B CN109228061 B CN 109228061B CN 201811160116 A CN201811160116 A CN 201811160116A CN 109228061 B CN109228061 B CN 109228061B
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- rubber tube
- film
- ring
- rotating ring
- forming process
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- 238000000034 method Methods 0.000 title claims abstract description 24
- 239000010408 film Substances 0.000 claims abstract description 53
- 239000007888 film coating Substances 0.000 claims abstract description 15
- 238000009501 film coating Methods 0.000 claims abstract description 15
- 239000010409 thin film Substances 0.000 claims abstract description 10
- 230000005540 biological transmission Effects 0.000 claims description 40
- 238000010030 laminating Methods 0.000 claims description 15
- 239000012528 membrane Substances 0.000 claims description 13
- 238000004804 winding Methods 0.000 claims description 12
- 238000004073 vulcanization Methods 0.000 abstract description 12
- 239000011248 coating agent Substances 0.000 description 17
- 238000000576 coating method Methods 0.000 description 17
- 239000007788 liquid Substances 0.000 description 4
- 230000001788 irregular Effects 0.000 description 3
- 230000006978 adaptation Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 210000002489 tectorial membrane Anatomy 0.000 description 2
- 238000007373 indentation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/002—Component parts, details or accessories; Auxiliary operations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/002—Component parts, details or accessories; Auxiliary operations
- B29C2035/005—Enveloping the material to be cured, e.g. by helically winding a film around the material
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- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Oral & Maxillofacial Surgery (AREA)
- Thermal Sciences (AREA)
- Lining Or Joining Of Plastics Or The Like (AREA)
Abstract
The invention relates to a rubber tube film-coating forming process. The rubber tube film-covering forming process comprises the following steps: 1) sleeving a rubber tube into the ring of the rotating ring, and attaching the thin film of the film ring to the surface of the rubber tube; 2) the power mechanism drives the rotating ring to rotate, the film is wound on the rubber tube, and meanwhile, the moving mechanism drives the rotating ring to move along the length direction of the rubber tube. The rubber tube film covering forming process can effectively improve the film covering uniformity of the rubber tube, reduce the phenomena of adhesion and unevenness of the surface of the rubber tube after vulcanization, and reduce the generation probability of unqualified products.
Description
Technical Field
The invention relates to a rubber tube film-coating forming process.
Background
The rubber tube is usually formed by vulcanization, and the rubber tube prepared by the traditional vulcanization process needs to determine the vulcanization temperature, time and other process parameters according to different conditions of the rubber tube such as material components, proportion, structure and the like, so that the uniform effect is difficult to realize.
If the vulcanization process is not properly controlled, the surface of the obtained rubber tube is sticky or uneven, which results in unqualified appearance. Therefore, a film is usually wrapped around the rubber tube before vulcanization to isolate air and water vapor, and the surface of the resulting rubber tube is not completely free from problems. The existing film winding and covering method adopts a manual mode, no special equipment is used for winding and covering the rubber tube with the film, so that when manual winding and covering are carried out, force control is uneven, the winding and covering tightness of the film cannot be controlled, and the surface of the rubber tube obtained after vulcanization still has adhesion or unevenness; moreover, the film is wrapped too tightly, and deep indentations are left on the surface of the rubber tube, so that the performance of the rubber tube is unqualified.
Disclosure of Invention
The invention provides rubber tube film covering equipment and a rubber tube film covering forming process, which can effectively improve the film covering uniformity of a rubber tube, reduce the phenomena of adhesion and unevenness of the surface of the rubber tube after vulcanization, and reduce the generation probability of unqualified products.
In order to solve the technical problems, the invention provides the technical scheme of the first aspect, namely, the rubber tube laminating equipment comprises a power mechanism, a rotating ring, a plurality of laminating columns and a moving mechanism; the power mechanism is in transmission connection with the rotating ring, and the power mechanism is fixedly connected with the moving mechanism; the film coating column is fixedly connected with the rotating ring; and winding a plurality of layers of thin films outside the film covering column to form a film ring.
Preferably, a driving wheel is arranged between the power mechanism and the rotating ring, the driving wheel is in transmission connection with the power mechanism, and the driving wheel is connected with the rotating ring through a transmission belt.
Preferably, the moving mechanism is a fixing part and a hand-held part, and the fixing part is fixedly connected with the hand-held part; or the moving mechanism is a fixing piece and a PLC control mechanism, and the fixing piece is connected with the PLC control mechanism.
Preferably, the fixing member is a fixing ring; the fixed ring and the rotating ring are connected in an internal-external sliding mode.
Preferably, the fixed ring and the rotating ring are located on the same plane, and the diameter of the fixed ring is smaller than that of the rotating ring.
Preferably, the number of the film-coating columns is 2-3, and the film-coating columns are uniformly distributed in all directions of the rotating ring.
Preferably, the distance between the outer edges of adjacent membrane coils is 1.5-3 times the diameter of the rubber tube.
Preferably, the diameter of the membrane ring is 1 to 1.5 times the diameter of the rubber tube.
Preferably, the rotational speed of the rotating ring is 10r/s to 15 r/s.
Preferably, the power mechanism is a pneumatic transmission mechanism and a compressed air device, or the power mechanism is a hydraulic transmission mechanism and a compressed liquid device.
The application also provides the technical scheme of the second aspect, namely a rubber tube film laminating forming process, which is to use any one of the rubber tube film laminating equipment to laminate a film on a rubber tube, and the steps comprise:
1) sleeving a rubber tube into the ring of the rotating ring, and attaching the thin film of the film ring to the surface of the rubber tube;
2) the power mechanism drives the rotating ring to rotate, the film is wound on the rubber tube, and meanwhile, the moving mechanism drives the rotating ring to move along the length direction of the rubber tube.
Preferably, the moving speed of the moving mechanism in the step 2) is 1-5 cm/s.
Preferably, the number of the film layers wound on the surface of the rubber tube is 1 to 3 on average.
Preferably, a driving wheel is arranged between the power mechanism and the rotating ring, the driving wheel is in transmission connection with the power mechanism, and the driving wheel is connected with the rotating ring through a transmission belt.
Preferably, the moving mechanism is a fixing part and a hand-held part, and the fixing part is fixedly connected with the hand-held part; or the moving mechanism is a fixing piece and a PLC control mechanism, and the fixing piece is connected with the PLC control mechanism.
Preferably, the fixing member is a fixing ring; the fixed ring is connected with the rotating ring in an internal-external sliding manner; step 1) is to sleeve the rubber tube into the ring of the fixed ring and attach the film of the film ring to the surface of the rubber tube.
Preferably, the fixed ring and the rotating ring are located on the same plane, and the diameter of the fixed ring is smaller than that of the rotating ring.
Preferably, the number of the film-coating columns is 2-3, and the film-coating columns are uniformly distributed in all directions of the rotating ring.
Preferably, the distance between the outer edges of adjacent membrane coils is 1.5-3 times the diameter of the rubber tube.
Preferably, the diameter of the membrane ring is 1 to 1.5 times the diameter of the rubber tube.
Preferably, the rotational speed of the rotating ring is 10r/s to 15 r/s.
Preferably, the power mechanism is a pneumatic transmission mechanism and a compressed air device, or the power mechanism is a hydraulic transmission mechanism and a compressed liquid device.
This application rubber tube tectorial membrane forming process, it utilizes power unit to drive the swivel becket rotation, and the film that drives the membrane circle in the swivel becket rotation twines and covers the rubber tube, because this application adopts the rotation mode under the power unit drives, compares in the artifical mode of covering the film of twining of current to the rubber tube, and its tectorial membrane uniformity that can effectively improve the rubber tube reduces the emergence of the sticky and unevenness condition in rubber tube surface after the vulcanization, reduces the production probability of unqualified product.
Drawings
FIG. 1 is a schematic view of the back of a rubber tube laminating apparatus according to an embodiment of the present invention;
FIG. 2 is a schematic front view of the rubber tube coating apparatus of the embodiment of FIG. 1;
FIG. 3 is a schematic view of the back of another embodiment of the rubber tube coating apparatus of the present invention;
FIG. 4 is a schematic front view of the rubber tube coating apparatus of the embodiment of FIG. 3;
FIG. 5 is a schematic view of the back of another embodiment of the rubber tube coating apparatus of the present invention;
FIG. 6 is a schematic front view of the rubber tube coating apparatus of the embodiment of FIG. 5.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention. In the present invention, the embodiments and the features of the embodiments may be arbitrarily combined with each other without conflict.
The following is detection data after the rubber tube is coated by the rubber tube coating apparatus according to the embodiment described in the present application.
Example one
As shown in fig. 1 and 2, fig. 1 is a schematic back view of a rubber tube laminating device according to an embodiment of the present invention; FIG. 2 is a schematic front view of the rubber tube coating apparatus of the embodiment of FIG. 1; the rubber tube film coating equipment of the embodiment comprises a power mechanism, a rotating ring 12, a plurality of film coating columns 16 and a moving mechanism;
the power mechanism comprises a hydraulic transmission mechanism 11 and a liquid compression device, and the liquid compression device is connected with the hydraulic transmission mechanism 11; the moving mechanism is a fixed part 13 and a hand-held part 15, the fixed part 13 is fixedly connected with the hand-held part 15, and the rotating ring 12 is slidably connected with the fixed part 13; the hydraulic transmission mechanism 11 is in transmission connection with the rotating ring 12, and the hydraulic transmission mechanism 11 is fixedly connected with the fixing piece 13.
The film-coated column 16 is fixedly connected with the rotating ring 12; the film-coated column 16 is wrapped with a plurality of layers of thin films to form the film loop 14. The number of the film-coated columns 16 is 3, and the three film-coated columns 16 are uniformly distributed at three positions of the rotating ring 12, and form an equilateral triangle.
The diameter of the rubber tube is S cm, the distance between the outer edges of the adjacent membrane rings 14 is L cm, the diameter of the membrane rings 14 is M cm, and the rotating speed of the rotating ring 12 is N r/S.
The rotating ring 12 in the embodiment of the present application may be in the shape of a circular ring, a square ring, or other regular or irregular ring; the fixing member may take various shapes.
The rubber tube coating equipment of the embodiment shown in FIG. 1 is used for coating the rubber tube, and comprises the following steps:
1) sleeving a rubber tube into the ring of the rotating ring 12, and attaching the thin film of the film ring 14 to the surface of the rubber tube;
2) the power mechanism drives the rotating ring 12 to rotate, the film is wound on the rubber tube, meanwhile, the moving mechanism drives the rotating ring 12 to move along the length direction of the rubber tube, and the moving speed of the moving mechanism is D cm/s.
The test data of the rubber tube obtained by winding the film according to the above embodiment and the related steps are shown in table 1 below, for example, the average number of winding layers d 1/layer, and the surface flatness d2/mm of the rubber tube after vulcanization. The resulting d2 is the difference in surface height per unit area of the rubber tube surface.
TABLE 1
Example two
As shown in fig. 3 and 4, fig. 3 is a schematic back view of a rubber tube laminating device according to another embodiment of the present invention; FIG. 4 is a schematic front view of the rubber tube coating apparatus of the embodiment of FIG. 3; the rubber tube film coating equipment of the embodiment comprises a power mechanism, a rotating ring 32, a plurality of film coating columns 36 and a moving mechanism;
the power mechanism comprises a pneumatic transmission mechanism 31 and a compressed gas device, and the compressed gas device is connected with the pneumatic transmission mechanism 31; the moving mechanism is a fixed ring 33 and a hand-held piece 35, the fixed ring 33 is fixedly connected with the hand-held piece 35, the rotating ring 32 is connected with the fixed ring 33 in an inner-outer sliding manner, the fixed ring 33 and the rotating ring 32 are positioned on the same plane, and the diameter of the fixed ring 33 is smaller than that of the rotating ring 32; the pneumatic transmission mechanism 31 is in transmission connection with the rotating ring 32, and the pneumatic transmission mechanism 31 is fixedly connected with the fixed ring 33.
A transmission wheel 37 is arranged between the air pressure transmission mechanism 31 and the rotating ring 32, the transmission wheel 37 is in transmission connection with the air pressure transmission mechanism 31, and the transmission wheel 37 is connected with the rotating ring 32 through a transmission belt 38.
The film coating column 36 is fixedly connected with the rotating ring 32; the film-coated column 36 is wrapped with a plurality of thin films to form the film loop 34. The number of the coating posts 36 is 2, and they are distributed at two positions on the rotary ring 32.
The diameter of the rubber tube is S cm, the distance between the outer edges of the adjacent membrane rings 34 is L cm, the diameter of the membrane rings 34 is M cm, and the rotating speed of the rotating ring 32 is N r/S.
The swivel ring 32 in the present embodiment may take the form of a circular ring, a square ring, or other regular or irregular ring shape.
The rubber tube coating equipment of the embodiment shown in FIG. 2 is used for coating the rubber tube, and comprises the following steps:
1) sleeving the rubber tube into the ring of the fixing ring 33, and attaching the thin film of the film ring 34 to the surface of the rubber tube;
2) the power mechanism drives the rotating ring 32 to rotate, the film is wound on the rubber tube, meanwhile, the moving mechanism drives the rotating ring 32 to move along the length direction of the rubber tube, and the moving speed of the moving mechanism is D cm/s.
The test data of the rubber tube obtained by winding the film according to the above embodiment and the related steps are shown in table 2 below, for example, the average number of winding layers d 1/layer, and the surface flatness d2/mm of the rubber tube after vulcanization. The resulting d2 is the difference in surface height per unit area of the rubber tube surface.
TABLE 2
| Examples | S | L | M | N | D | d1 | d2 |
| 1 | 10 | 30 | 10 | 10 | 5 | 1 | 0.04 |
| 2 | 10 | 25 | 10 | 10 | 4 | 1 | 0.04 |
| 3 | 10 | 20 | 12 | 12 | 3 | 2 | 0.03 |
| 4 | 10 | 15 | 15 | 15 | 2 | 2 | 0.03 |
| 5 | 10 | 15 | 15 | 15 | 1 | 3 | 0.02 |
EXAMPLE III
As shown in fig. 5 and 6, fig. 5 is a schematic back view of a rubber tube laminating device according to another embodiment of the present invention; FIG. 6 is a schematic front view of the rubber tube coating apparatus of the embodiment of FIG. 5. The rubber tube laminating device of the embodiment comprises a power mechanism, a rotating ring 52, a plurality of laminating columns 56 and a moving mechanism;
the power mechanism comprises a pneumatic transmission mechanism 51 and a compressed gas device, and the compressed gas device is connected with the pneumatic transmission mechanism 51; the moving mechanism is a fixed ring 53 and a PLC control mechanism, the fixed ring 53 is fixedly connected with the PLC control mechanism, the rotating ring 52 is in internal and external sliding connection with the fixed ring 53, the fixed ring 53 and the rotating ring 52 are positioned on the same plane, and the diameter of the fixed ring 53 is smaller than that of the rotating ring 52; the pneumatic transmission mechanism 51 is in transmission connection with the rotating ring 52, and the pneumatic transmission mechanism 51 is fixedly connected with the fixed ring 53.
A transmission wheel 57 is arranged between the pneumatic transmission mechanism 51 and the rotating ring 52, the transmission wheel 57 is in transmission connection with the pneumatic transmission mechanism 51, and the transmission wheel 57 is connected with the rotating ring 52 through a transmission belt 58.
The film coating column 56 is fixedly connected with the rotating ring 52; the film-coated column 56 is wrapped with a plurality of thin films to form a film ring 54. The number of the coating posts 56 is 2, and they are distributed at two positions of the rotary ring 52.
The diameter of the rubber tube is S cm, the distance between the outer edges of adjacent membrane rings 54 is L cm, the diameter of the membrane ring 54 is M cm, and the rotation speed of the rotating ring 52 is N r/S.
The rotating ring 52 in the present embodiment may take the shape of a circular ring, a square ring, or other regular or irregular ring.
The rubber tube coating equipment of the embodiment shown in FIG. 3 is used for coating the rubber tube, and the method comprises the following steps:
1) sleeving the rubber tube into the ring of the fixing ring 53, and attaching the film of the film ring 54 to the surface of the rubber tube;
2) the power mechanism drives the rotating ring 52 to rotate, the film is wound on the rubber tube, meanwhile, the moving mechanism drives the rotating ring 52 to move along the length direction of the rubber tube, and the moving speed of the moving mechanism is D cm/s.
The test data of the rubber tube obtained by winding the film according to the above embodiment and the related steps are shown in table 3 below, for example, the average number of winding layers d 1/layer, and the surface flatness d4/mm of the rubber tube after vulcanization.
TABLE 3
| Examples | S | L | M | N | D | d1 | d2 |
| 1 | 12 | 36 | 12 | 10 | 5 | 1 | 0.02 |
| 2 | 12 | 30 | 12 | 10 | 4 | 1 | 0.02 |
| 3 | 12 | 24 | 15 | 12 | 3 | 2 | 0.02 |
| 4 | 12 | 18 | 18 | 15 | 2 | 2 | 0.01 |
| 5 | 12 | 18 | 18 | 15 | 1 | 3 | 0.01 |
From the above table data, it can be seen that the detection data of the coated rubber tube obtained in the second embodiment and the third embodiment are better than the first embodiment, and the effect of the third embodiment is obviously stabilized after the movement is realized by the PLC control mechanism.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and adaptations can be made without departing from the spirit and scope of the invention, and these modifications and adaptations should be considered within the scope of the invention.
Claims (10)
1. The rubber tube film-coating forming process is characterized by comprising the following steps: the rubber tube laminating method comprises the following steps that rubber tube laminating equipment is adopted for laminating a rubber tube, and the rubber tube laminating equipment comprises a power mechanism, a rotating ring, a plurality of laminating columns and a moving mechanism; the power mechanism is in transmission connection with the rotating ring, and the power mechanism is fixedly connected with the moving mechanism; the film coating column is fixedly connected with the rotating ring; winding a plurality of layers of thin films outside the film covering column to form a film ring;
the film covering process comprises the following steps:
1) sleeving a rubber tube into the ring of the rotating ring, and attaching the thin film of the film ring to the surface of the rubber tube;
2) the power mechanism drives the rotating ring to rotate, the film is wound on the rubber tube, and meanwhile, the moving mechanism drives the rotating ring to move along the length direction of the rubber tube.
2. The rubber tube film-covering forming process according to claim 1, characterized in that: the moving speed of the moving mechanism in the step 2) is 1-5 cm/s.
3. The rubber tube film-covering forming process according to claim 1, characterized in that: the average number of the layers of the film wound on the surface of the rubber tube is 1-3.
4. The rubber tube film-covering forming process according to claim 1, characterized in that: a driving wheel is arranged between the power mechanism and the rotating ring, the driving wheel is in transmission connection with the power mechanism, and the driving wheel is connected with the rotating ring through a driving belt.
5. The rubber tube film-covering forming process according to claim 1, characterized in that: the moving mechanism is a fixing piece and a hand-holding piece which are fixedly connected; or the moving mechanism is a fixing piece and a PLC control mechanism, and the fixing piece is connected with the PLC control mechanism.
6. The rubber tube film-covering forming process according to claim 5, characterized in that: the fixing piece is a fixing ring, and the fixing ring is connected with the rotating ring in an internal-external sliding manner; step 1) is to sleeve the rubber tube into the ring of the fixed ring and attach the film of the film ring to the surface of the rubber tube.
7. The rubber tube film-covering forming process according to claim 6, characterized in that: the fixed ring and the rotating ring are positioned on the same plane, and the diameter of the fixed ring is smaller than that of the rotating ring.
8. The rubber tube film-covering forming process according to claim 1, characterized in that: the number of the film-coated columns is 2-3, and the film-coated columns are uniformly distributed in all directions of the rotating ring.
9. The rubber tube film-covering forming process according to claim 1, characterized in that: the distance between the outer edges of the adjacent membrane rings is 1.5 to 3 times of the diameter of the rubber tube.
10. The rubber tube film-covering forming process according to claim 1, characterized in that: the diameter of the membrane ring is 1-1.5 times of the diameter of the rubber tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811160116.6A CN109228061B (en) | 2018-09-30 | 2018-09-30 | Rubber tube film-covering forming process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811160116.6A CN109228061B (en) | 2018-09-30 | 2018-09-30 | Rubber tube film-covering forming process |
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| Publication Number | Publication Date |
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| CN109228061A CN109228061A (en) | 2019-01-18 |
| CN109228061B true CN109228061B (en) | 2020-11-06 |
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| CN201811160116.6A Active CN109228061B (en) | 2018-09-30 | 2018-09-30 | Rubber tube film-covering forming process |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2007029386A1 (en) * | 2005-09-05 | 2007-03-15 | Sumitomo Bakelite Co., Ltd. | Device and method for cutting and winding tubular resin film |
| CN102145773B (en) * | 2010-12-31 | 2013-11-27 | 深圳市通产丽星股份有限公司 | Film-coated hose and manufacturing method thereof |
| CN104443494B (en) * | 2014-10-31 | 2019-06-11 | 宁波卓呈自动化装备有限公司 | A kind of roller packing machine |
| ES2727825T3 (en) * | 2015-05-04 | 2019-10-21 | Sica Spa | Machine for packing flexible hoses |
| CN205997347U (en) * | 2016-08-31 | 2017-03-08 | 山东迪浩耐磨管道股份有限公司 | A kind of ultra high molecular weight polyethylene films piece wrapped tube machine |
| CN108263655A (en) * | 2018-03-26 | 2018-07-10 | 福建金砖知识产权服务有限公司 | A kind of aluminum alloy square tube protective film wind |
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