CN113428435A - Thermal shrinkage method for section bar thermal shrinkage film - Google Patents
Thermal shrinkage method for section bar thermal shrinkage film Download PDFInfo
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- CN113428435A CN113428435A CN202110831572.4A CN202110831572A CN113428435A CN 113428435 A CN113428435 A CN 113428435A CN 202110831572 A CN202110831572 A CN 202110831572A CN 113428435 A CN113428435 A CN 113428435A
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- hot air
- profile
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- heat
- thermal shrinkage
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B53/00—Shrinking wrappers, containers, or container covers during or after packaging
- B65B53/02—Shrinking wrappers, containers, or container covers during or after packaging by heat
- B65B53/06—Shrinking wrappers, containers, or container covers during or after packaging by heat supplied by gases, e.g. hot-air jets
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B41/00—Supplying or feeding container-forming sheets or wrapping material
- B65B41/02—Feeding sheets or wrapper blanks
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
- B65B51/10—Applying or generating heat or pressure or combinations thereof
- B65B51/22—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding
- B65B51/225—Applying or generating heat or pressure or combinations thereof by friction or ultrasonic or high-frequency electrical means, i.e. by friction or ultrasonic or induction welding by ultrasonic welding
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
- B65B61/00—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages
- B65B61/04—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages
- B65B61/06—Auxiliary devices, not otherwise provided for, for operating on sheets, blanks, webs, binding material, containers or packages for severing webs, or for separating joined packages by cutting
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
Abstract
The invention discloses a thermal shrinkage method for a profile thermal shrinkage film. The thermal shrinkage method of the section bar thermal shrinkage film provided by the invention has the advantages of low energy consumption, convenience in operation and higher safety.
Description
Technical Field
The invention relates to the field of section bar packaging, in particular to a section bar thermal shrinkage film thermal shrinkage method.
Background
After the surface of the section is subjected to acid-base cleaning and other treatments, in order to better protect the surface of the section and reduce the problem of scratches caused by collision, a heat-shrinkable film is coated on the surface of the section before packaging. The traditional way of coating the surface of the section bar with the heat-shrinkable film is to sleeve a plurality of section bars with the heat-shrinkable film and then put the section bars into an oven provided with an electric heating tube together. The electric heating pipes are multiple and distributed in the bottom and the side wall of the oven, the power of each electric heating pipe is about 1KW, the larger the oven is, the more electric heating pipes need to be arranged, and the larger the power needed by the whole oven is. The inside of the oven was heated to 80-140 ℃ in advance. In order to ensure that the thermal shrinkage films of the profiles are heated uniformly, hot air is pressed downwards in the oven through a fan at the top. However, the above method has the following drawbacks: 1) the drying oven needs to be preheated firstly, the preheating needs more than ten minutes due to the large volume of the drying oven, the consumed time is long, the section is heated while the heat shrinkage film is acted, and the energy consumption reaches more than 30 KW; 2) personnel need be close to the higher oven of temperature when carrying the section bar, and operational environment is comparatively abominable, and is big to personnel physical stamina consumption, and the security is also lower.
Disclosure of Invention
The invention aims to provide a thermal shrinkage method of a thermal shrinkage film for a profile, which has the advantages of low energy consumption, convenient operation and higher safety.
In order to achieve the purpose, the invention provides a thermal shrinkage method of a section bar thermal shrinkage film.
As a further improvement of the invention, the length of the area of the hot air nozzle blowing hot air to the surface of the heat shrinkable film is shorter than the length of the section bar; when hot air is blown to the surface of the heat shrinkable film by the hot air nozzle, the section bar and the hot air blowing area relatively move along the length direction of the section bar.
As a further development of the invention, the region for blowing hot air is arranged around the profile.
As a further improvement of the invention, the length of the hot air blowing area is 1cm-150 cm.
As a further improvement of the invention, the number of the hot air nozzles is at least two; air is made to form wind in the pipeline, the wind passes through the heating area to form hot wind, and then the hot wind is distributed to each hot wind nozzle.
As a further improvement of the invention, the hot air which is contacted with the heat-shrinkable film is recovered and mixed with fresh air, and the mixture is heated and then blown out through the hot air nozzle again.
As a further improvement of the invention, the distance between the hot air nozzle and the section bar is less than 20 cm.
As a further improvement of the invention, the air volume of the hot air blowing area is 50-400 cubic meters per hour.
As a further improvement of the invention, the temperature of the hot air at the outlet of the hot air nozzle is 80-140 ℃.
Advantageous effects
Compared with the prior art, the section bar thermal shrinkage film thermal shrinkage method has the advantages that:
1. the hot air sprayed out from the hot air nozzle heats the thermal shrinkage film sleeved outside the section bar in the conveying process, so that the thermal shrinkage film can be quickly heated and wrapped on the surface of the section bar. The hot air of the mode directly acts on the heat shrinkage film, the heating amount of the section is very little, the required hot air volume is less, the preheating time required by equipment is very short, the time is saved, and the production continuity is high; in addition, because the required preheating time is extremely short, the energy consumption is lower when air is heated, compared with the traditional oven, the sectional material heat-shrinkable film with the same quantity and specification is heated, and the sectional material heat-shrinkable film heat-shrinkable device only needs to consume 2-5KW of the power of an electric heating system and is far lower than the traditional 30 KW.
2. The hot air nozzles are arranged around the section bar conveying path, so that the heat-shrinkable film sleeved outside the section bar is heated more uniformly, the shrinking speeds of all the parts are basically the same, and the problem of partial deflection of the heat-shrinkable film is not easy to occur.
3. The hot air nozzles are arranged along the conveying direction of the section bar, so that the heating time of the heat shrinkage film outside the section bar can be ensured to be enough, and meanwhile, the conveying speed of the section bar does not need to be slowed down.
4. The hot air nozzle is arranged on the inner wall of the pressure stabilizing box body channel and communicated with the pressure stabilizing inner cavity, and is beneficial to uniform distribution of hot air. The air inlet pipe is provided with a heating structure, so that the heating area is small, the heating is fast, and the energy consumption is low. Let the air form wind in the pipeline earlier, wind forms hot-blast through the heating structure, then distributes hot-blast to each hot-blast spout through steady voltage inner chamber, does not need the large tracts of land heating, utilizes hot-blast mobility to make the pyrocondensation membrane large face be heated evenly.
5. The section bar and the pyrocondensation membrane after unreeling all pass section bar pyrocondensation membrane cover and establish the device, and section bar pyrocondensation membrane cover is established the device and is utilized two curb plates, roof, first bottom plate and second bottom plate to the guide effect of pyrocondensation membrane to can let the pyrocondensation membrane from the plane to be wound into the tube-shape gradually and wrap up in the section bar outside, need not artifical parcel, realizes automated production. When the thermal shrinkage film wound into a cylindrical shape passes through the thermal shrinkage film edge sealing structure, the thermal shrinkage film edge sealing structure enables the overlapped parts of the two side edges of the thermal shrinkage film to be attached together in an electrostatic or ultrasonic mode, so that the thermal shrinkage film is prevented from being unfolded again, and the subsequent processes of cutting the seal of the thermal shrinkage film, heat shrinkage and the like are facilitated.
6. The first hypotenuse guide part of curb plate, the second hypotenuse guide part of first bottom plate and the third hypotenuse guide part of second bottom plate can play the guide effect to pyrocondensation membrane, reduce the resistance simultaneously, prevent that pyrocondensation membrane from blocking or being lacerated.
7. After the thermal shrinkage film is sleeved outside the section bar, the negative pressure film sucking conveyor belt can suck the thermal shrinkage film to prevent slipping.
The invention will become more apparent from the following description when taken in conjunction with the accompanying drawings, which illustrate embodiments of the invention.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a front cross-sectional view of a profile heat shrink film heat shrink device;
FIG. 2 is a left side cross-sectional view of a profile heat shrink film heat shrink device;
FIG. 3 is an enlarged view of the air inlet duct and the heat generating structure;
FIG. 4 is a schematic view of a section packaging line equipped with a section heat-shrinkable film heat-shrinking device;
FIG. 5 is a view showing a state of the heat shrinkable film cover device;
FIG. 6 is a front view of the profile shrink wrap device;
FIG. 7 is a bottom view of the profile shrink wrap device;
FIG. 8 is a top view of the profile shrink wrap device;
FIG. 9 is a left side view of the profile shrink wrap device;
fig. 10 is an enlarged cross-sectional view of the negative pressure suction film conveyer belt.
Detailed Description
Embodiments of the present invention will now be described with reference to the accompanying drawings.
Examples
Detailed description of the inventionas shown in fig. 1 to 10, a profile heat-shrink film heat-shrinking device includes a device body 1, and the device body 1 includes a hot air nozzle 11 disposed outside a profile conveying path. The hot air nozzle 11 can be single, and the hot air nozzle 11 can also be arranged into a strip-shaped annular nozzle; in addition, the hot air nozzles 11 may also be at least two and arranged around the profile conveying path, that is, each hot air nozzle 11 is annularly surrounded, so that an annular heated space where the cross section of the profile is located is uniformly heated, or the hot air nozzles 11 may also be spirally arranged around the profile conveying path. The hot air nozzles 11 spray hot air in a dotted manner, and in this embodiment, the hot air nozzles 11 are multiple and arranged around the profile conveying path. The hot air nozzles 11 are arranged in a plurality of rows along the conveying direction of the section bar, and each row is provided with 12 hot air nozzles 11 arranged around the conveying path of the section bar.
In this embodiment, the device body 1 of the section bar thermal shrinkage film thermal shrinkage device further comprises a pressure stabilizing box body 12, and a channel 13 which is through along two ends of the section bar conveying path is arranged in the middle of the pressure stabilizing box body 12. The pressure stabilizing box body 12 is provided with an annular pressure stabilizing inner cavity 19 which is arranged around the outer side of the channel 13, and each hot air nozzle 11 is arranged on the inner wall of the channel 13 and is communicated with the pressure stabilizing inner cavity 19. The pressure stabilizing box body 12 is connected with an air inlet pipe 17. Besides this embodiment, each hot air nozzle 11 may be provided on a separate air jet device.
The number of the air inlet pipes 17 is two and the air inlet pipes are positioned at different positions of the pressure stabilizing box body 12, so that the hot air temperature of each area of the pressure stabilizing box body 12 is ensured to be consistent as much as possible, and in addition, more than two or one air inlet pipe 17 can be arranged according to the size of the pressure stabilizing box body 12. The air inlet pipe 17 is provided with a heating structure 18, and in this embodiment, the heating structure 18 includes an electric heating wire. The fan 14 is connected with the air inlet pipe 17 through the blast pipe 15, an electrical box 16 is arranged between the blast pipe 15 and the air inlet pipe 17, the electrical box 16 is electrically connected with the heating wire of the heating structure 18 to supply power for the heating wire, and simultaneously, the temperature of hot air is detected and controlled between 80 ℃ and 140 ℃. A box body bracket is connected below the pressure stabilizing box body 12, and the fan 14 is arranged on the pressure stabilizing box body 12.
The thermal shrinkage method of the section bar thermal shrinkage film comprises the following steps: the hot air nozzle 11 blows hot air to the surface of the heat shrinkage film sleeved on the outer side of the section bar, so that the heat shrinkage film is heated to shrink and wrap the section bar. The length of the area of the hot air nozzle 11 blowing hot air towards the surface of the heat shrinkable film is shorter than that of the section bar. When hot air is blown to the surface of the heat shrinkable film by the hot air nozzle 11, the section and the hot air blowing area relatively move along the length direction of the section. The hot air blowing area is arranged around the section bar.
The distance between the hot air nozzle 11 and the section bar is less than 20 cm. The temperature of the hot air at the outlet of the hot air nozzle 11 is 80-140 ℃. The smaller the distance between the hot air nozzle 11 and the section bar 10 is, the less heat is dissipated between the hot air sprayed out and the contact of the hot air with the heat shrinkable film 9, the more energy is saved, and the temperature can be selected according to the moving speed of the section bar 10 and the heat shrinkage characteristic of the heat shrinkable film 9.
The air volume of the hot air blowing area is 50-400 cubic meters per hour. In the embodiment, the air volume is 210 cubic meters per hour, the requirement of shrinking the heat-shrinkable film of the section 10 with the section width of about 10cm can be met, the length of the pressure stabilizing box body 12 (the length of the hot air blowing area) is about 1m, and the distance between the hot air nozzle 11 and the section is about 10-15 cm. The relative movement speed of the section and the hot air blowing area is 5cm/s-50cm/s, and in the embodiment, the conveying speed of the section is controlled to be about 10 cm/s. In addition, the length of the hot air blowing area can be set within the range of 1cm-150cm according to the temperature of hot air and the heat required by shrinkage of the heat-shrinkable film.
Specifically, the cylindrical heat-shrinkable film 9 is firstly sleeved on the outer side of the profile 10, and then the two are passed through the channel 13 of the pressure-stabilizing box 12 at a relatively stable speed along the length direction of the profile 10. The hot air sprayed from the hot air nozzle 11 directly acts on the heat shrinkage film 9 to rapidly heat and shrink the heat shrinkage film 9, so that the heat shrinkage film 9 is tightly wrapped on the outer surface of the section bar 10.
In addition, a hot air return port 61 is provided at the profile input end or/and profile output end side of the apparatus main body 1, the hot air return port 61 is communicated with the front end of the air inlet duct 17 through a return duct 62, and the return duct 62 is connected to a second fan 63. In this embodiment, the hot air return port 61 is provided in plural and is located at the tail of the pressure stabilizing box 12 in a ring shape. Through the negative pressure generated by the second fan 63, the hot air return port 61 can recycle the hot air in the annular pressure stabilizing cavity 19, which has contacted the thermal shrinkage film 9, and convey the hot air to the front end of the air inlet pipe 17 to be mixed with the fresh air, and the fresh air is heated by using the rest temperature. The electrical box 16 adjusts the heating power of the heating structure 18 by detecting the temperature of the fresh air passing through the input port of the air inlet pipe 17, thereby achieving the energy-saving effect.
The section bar heat shrinkable film heat shrinkable device can be used independently, manually conveys the section bars 10 and can also be used in a section bar packaging production line. As shown in fig. 4 to 10, a sectional material packaging production line includes a sectional material heat shrinkage film heat shrinkage device, and further includes a sectional material conveying mechanism at least disposed at one side of an input end or an output end of the sectional material heat shrinkage film heat shrinkage device.
In this embodiment, the front side of the input end of the section bar heat shrinkage film heat shrinkage device is provided with a section bar heat shrinkage film sleeving device 2. The front of the input end of the section bar thermal shrinkage film sleeving device 2 is provided with a thermal shrinkage film unwinding structure and a thermal shrinkage film guide roller 8 after the thermal shrinkage film 9 is unwound. The section bar heat shrinkable film sleeving device 2 comprises two side plates 21, a top plate 24, a first bottom plate 22 and a second bottom plate 23, and a second channel 29 is defined by the two side plates 21, the top plate 24, the first bottom plate 22 and the second bottom plate 23. The top plate 24 is connected between upper portions of the two side plates 21, and the first bottom plate 22 and the second bottom plate 23 are connected to lower portions of the two side plates 21, respectively. The first bottom plate 22 is located below the second bottom plate 23 with a gap 291 therebetween, and the gap 291 is in communication with the second channel 29. A thermal shrinkage film edge sealing structure 3 is arranged below the rear part of the section bar thermal shrinkage film sleeving device 2. The heat shrink film edge sealing structure 3 includes an electrostatic edge sealer or an ultrasonic welder. In this embodiment, the thermal shrinkage film edge sealing structure 3 is an electrostatic edge sealing device. The section bar heat shrinkable film sleeving device 2 further comprises an opening 26 and a section bar supporting part 28 which are sequentially arranged behind the first bottom plate 22 and the second bottom plate 23, and two sides of the section bar supporting part 28 are respectively connected with the bottoms of the two side plates 21. The heat shrink film edge sealing structure 3 is located below the opening 26 of the section heat shrink film sleeving device 2. The upper part of the top plate 24 of the section bar thermal shrinkage film sheathing device 2 is connected with a mounting frame 27.
The side plate 21 is provided with a first bevel guide 25 on the front side. The front sides of the first and second bottom plates 22 and 23 are provided with a second and third hypotenuse guide portions 221 and 231, respectively. The rear ends of the first hypotenuse guide portions 25 of the two side plates 21 are connected to the front ends of both the second hypotenuse guide portion 221 and the third hypotenuse guide portion 231, respectively. The front end edge of the top plate 24 is substantially flush with the front ends of the two first hypotenuse guides 25.
After the heat-shrinkable film 9 passes through the heat-shrinkable film guide roller 8, the middle part of the heat-shrinkable film 9 extends into and passes through the second channel 29, and the middle part of the heat-shrinkable film 9 is contacted with the front end of the top plate 24. The two sides of the heat-shrinkable film 9 respectively bypass the first bevel edge guide parts 25 at the two sides at the inlet of the second channel 29 and are stuck to the outer side of the side plate 21 upwards, one side edge of the heat-shrinkable film 9 obliquely bypasses the lower edge of the side plate 21 downwards along the outer surface of the side plate 21 at the side, passes through the lower surface of the second bottom plate 23 and is positioned in the gap 291; the other edge of the heat shrinkable film 9 obliquely passes downward around the lower edge of the side plate 21 along the outer surface of the side plate 21 on the side, passes through the lower surface of the first bottom plate 22, passes around the side edge of the first bottom plate 22, and enters the gap 291 upward, and then overlaps with the other edge of the heat shrinkable film 9.
A negative pressure film sucking conveying belt 4 and a thermal shrinkage film sealing and cutting structure 5 are sequentially arranged between the output end of the section thermal shrinkage film sleeving device 2 and the input end of the section thermal shrinkage film thermal shrinkage device. A plurality of air suction holes 41 are distributed on the negative pressure film suction conveying belt 4, a negative pressure groove 42 is arranged below the conveying section of the negative pressure film suction conveying belt 4, the negative pressure groove 42 corresponds to the plurality of air suction holes 41 on the conveying section of the negative pressure film suction conveying belt 4, and the negative pressure groove 42 is connected with a negative pressure pipe 43. The suction holes 41 of the conveying section of the negative pressure film suction conveying belt 4 generate adsorption force to the heat shrinkage film 9 sleeved outside the section bar 10 under the action of the negative pressure pipe 43.
During the use, utilize the negative pressure to inhale membrane conveyer belt 4 and adsorb fixedly the cover and establish pyrocondensation membrane 9 outside section bar 10, can will be located the pyrocondensation membrane 9 of section bar pyrocondensation membrane cover and establish device 2 department and stimulate toward section bar 10 direction of delivery when negative pressure inhales membrane conveyer belt 4 and carries, realize that the pyrocondensation membrane 9 through pyrocondensation membrane guide roll 8 forms the tube-shape gradually in section bar pyrocondensation membrane cover and establishes device 2 department to the parcel is in the section bar 10 outside that passes from section bar pyrocondensation membrane cover and establish second passageway 29 of device 2. The parcel of pyrocondensation membrane 9 is behind section bar 10 outside and when passing through pyrocondensation membrane banding structure 3 top, and pyrocondensation membrane banding structure 3 produces static and the laminating is in the same place through the edge that makes 9 both sides of pyrocondensation membrane overlap, prevents that pyrocondensation membrane 9 from scattering.
In this embodiment, section bar conveying mechanism of section bar packaging production line still includes first conveyer belt 6 and second conveyer belt 7, and first conveyer belt 6 sets up and seals between cutting structure 5 and section bar heat shrinkable film heat shrink device's device main part 1 at the pyrocondensation membrane, and second conveyer belt 7 sets up in section bar heat shrinkable film heat shrink device's device main part 1 output rear.
The present invention has been described in connection with the preferred embodiments, but the present invention is not limited to the embodiments disclosed above, and is intended to cover various modifications, equivalent combinations, which are made in accordance with the spirit of the present invention.
Claims (10)
1. A thermal shrinkage method for a profile thermal shrinkage film is characterized in that hot air is blown to the surface of the thermal shrinkage film sleeved on the outer side of the profile by a hot air nozzle (11) to enable the thermal shrinkage film to be heated and shrunk to wrap the profile.
2. The profile heat shrink film heat shrink method according to claim 1, wherein the length of the area where the hot air nozzle (11) blows hot air toward the heat shrink film surface is shorter than the length of the profile; when hot air is blown to the surface of the heat shrinkable film by the hot air nozzle (11), the section bar and the area for blowing the hot air relatively move along the length direction of the section bar.
3. The heat-shrinkable film heat-shrinking method of profiles according to claim 2, wherein the speed of the relative movement of said profiles and the area to which hot air is blown is 5cm/s to 50 cm/s.
4. The profile heat shrink film heat shrink method as claimed in claim 1 or 2, wherein the area for blowing hot air is provided around the profile.
5. The profile heat shrink film heat shrink method as claimed in claim 1, wherein the length of the hot air blowing area is 1cm-150 cm.
6. The profile heat shrink film heat shrink method according to claim 1, wherein the number of the hot air nozzles (11) is at least two; air is firstly made to form wind in the pipeline, the wind passes through the heating area to form hot wind, and then the hot wind is distributed to each hot wind nozzle (11).
7. The method for heat-shrinking a profile by using a heat-shrinkable film according to claim 1, wherein the hot air which has contacted the heat-shrinkable film is recovered and mixed with fresh air, heated and then blown out again through the hot air nozzle (11).
8. The profile heat shrink film heat shrink method according to claim 1, wherein the distance between the hot air nozzle (11) and the profile is less than 20 cm.
9. The method of claim 1, wherein the blowing rate of the hot air is 50-400 cubic meters per hour.
10. The profile heat shrink film heat shrink method according to claim 1, wherein the outlet hot air temperature of the hot air nozzle (11) is 80-140 ℃.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110831572.4A CN113428435A (en) | 2021-07-22 | 2021-07-22 | Thermal shrinkage method for section bar thermal shrinkage film |
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| CN202110831572.4A CN113428435A (en) | 2021-07-22 | 2021-07-22 | Thermal shrinkage method for section bar thermal shrinkage film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114435650A (en) * | 2022-02-26 | 2022-05-06 | 福建升隆食品有限公司 | Automatic film roll packaging machine |
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| CN208931830U (en) * | 2018-09-29 | 2019-06-04 | 瑞安市新元包装机械设备有限公司 | A kind of internal-circulation type thermal shrinking package machine |
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