A biaxial stretch forming process for beer label film

Abstract

The application discloses a two-way stretch forming process of a beer label film applied to the field of stretch forming, which is characterized in that the film after stretching is made to advance along a contact heat-absorbing cooling plate in the existing process, the contact heat-absorbing cooling plate absorbs the heat of the film to cool the film, the contact heat-absorbing cooling plate transmits the heat to a heat-conducting block, and the heat of the heat-conducting block is taken away by circulating cooling liquid, so that the cooling uniformity of the film is effectively improved, a plurality of temperature monitors are used to monitor a plurality of regions of the film, the feedback of the cooling effect is realized through the comparison between the monitoring values and set values, and the capacity of a self-adjusting and controlling circulating flow cavity is adjusted by injecting cooling liquid into the self-adjusting and controlling circulating flow cavity through a micro two-way water pump, so that the cooling effect of each heat-conducting block is accurately controlled, the cooling uniformity of the whole film is effectively improved, the cooling regulation and control of the plurality of regions of the film are realized, and the cooling uniformity of the film is effectively improved.

Description

Technical Field

[0001] This invention relates to the field of stretch forming, and in particular to a biaxial stretch forming process for beer label films. Background Technology

[0002] Using self-adhesive paper beer labels results in a lot of paper waste and pollution, is difficult to recycle directly, and is costly. Therefore, they are gradually being replaced by film labels using wet adhesive.

[0003] The film label utilizes a five-layer co-extrusion pearlescent film production line to modify the surface of the produced pearlescent film, adding a modified layer that can be directly molded. After molding and laser-aluminizing the material, it is laminated with non-woven fabric and coated on the laser-etched surface to obtain a beer label film suitable for wet adhesive application. After the five-layer co-extrusion film, it first needs to be biaxially stretched. Existing biaxial stretching processes mostly use cooling rollers and air cooling for the film's cooling and shaping process. However, the cooling effect is limited, and the cooling uniformity is difficult to control. This uneven cooling leads to stress and deformation in the film, which in turn affects subsequent label film processing.

[0004] Therefore, we use this technical solution to address the problem of poor cooling and shaping effect in the existing biaxial stretching process. Summary of the Invention

[0005] The purpose of this invention is to improve the cooling and shaping process in the prior art. Compared with the prior art, it provides a biaxial stretching molding process for beer label film. In the existing process, the stretched film is moved forward along a contact heat-absorbing cooling plate. The contact heat-absorbing cooling plate absorbs the heat of the film and cools it. The contact heat-absorbing cooling plate transfers the heat to the heat-conducting blocks. The circulating coolant carries away the heat from the heat-conducting blocks, thereby effectively improving the cooling uniformity of the film. Multiple temperature monitors are used to monitor multiple areas of the film. The cooling effect is fed back by comparing the monitored values ​​with the set values. The capacity of the self-regulating circulating flow chamber is adjusted by controlling the injection of coolant into the self-regulating circulating flow chamber by a micro biaxial water pump. This precisely controls the cooling effect of each heat-conducting block, thereby effectively improving the cooling uniformity of the entire film.

[0006] This allows for cooling regulation of multiple regions of the thin film, thereby effectively improving the cooling uniformity of the film.

[0007] Furthermore, the self-regulating cooling box in step S2 includes an insulated box, and both side walls of the insulated box have delivery ports matching the film. A cooling control seat is fixedly connected to the bottom of the insulated box, and a contact heat-absorbing cooling plate is fixedly connected above the cooling control seat. The film is placed above the contact heat-absorbing cooling plate. Multiple equally spaced heat-conducting blocks are fixedly connected to the lower side wall of the contact heat-absorbing cooling plate. The upper and lower inner walls of the cooling control seat have a cooling chamber and a self-regulating circulating flow chamber, respectively. The cooling chamber is filled with coolant. Both sides of the cooling chamber and the self-regulating circulating flow chamber are connected to circulation pipes. A water pump connected to the circulation pipes is installed at the bottom of the cooling chamber. The heat-conducting blocks penetrate into the self-regulating circulating flow chamber. Inside the chamber, multiple semiconductor cooling chips are installed at the bottom of the cooling chamber, and multiple temperature monitors are installed on the upper inner wall of the insulated box at equal intervals. Multiple symmetrically distributed resetters are fixedly connected to the lower inner wall of the self-regulating circulating flow chamber, and upper push plates are fixedly connected to the upper ends of these resetters. A deformable water-resistant membrane is also fixedly connected to the inner wall of the self-regulating circulating flow chamber, with its lower surface adhering to the upper push plate. Multiple miniature bidirectional water pumps are also installed on the upper inner wall of the cooling chamber, facing the self-regulating circulating flow chamber. Water pipes extending into both the cooling chamber and the self-regulating circulating flow chamber are connected to these miniature bidirectional water pumps. The insulated box includes a temperature monitoring module, a module for comparing detected and set values, and an adjustment module. The adjustment module controls... The processor is electrically connected to a miniature bidirectional water pump. During cooling, the stretched film moves forward along a contact heat-absorbing cooling plate. The plate absorbs heat from the film and transfers it to a heat-conducting block, which then transfers the heat to the circulating coolant, thus cooling the film. Multiple temperature monitors monitor the temperature of multiple areas of the film. A module comparing the detected and setpoint values ​​compares the temperature values ​​with the setpoints. When the temperature difference exceeds a threshold, an adjustment module is triggered. This module controls the processor to activate the miniature bidirectional water pump corresponding to the temperature monitor, injecting or extracting coolant into the self-regulating circulating flow chamber. When the temperature detected by the temperature monitor is higher than the setpoint, the miniature bidirectional water pump... The water pump draws coolant out of the self-regulating circulating flow chamber, thereby increasing the capacity of the chamber to hold more coolant and improving the cooling effect on the heat-conducting block. This indirectly improves the cooling effect on the film in this area. When the temperature monitored by the temperature monitor is lower than the set value, the miniature bidirectional water pump injects coolant into the self-regulating circulating flow chamber. The injection of coolant causes the deformable water-resistant membrane on the upper push plate to rise, thereby reducing the capacity of the self-regulating circulating flow chamber and reducing the amount of coolant it holds. This reduces the cooling effect on the heat-conducting block and indirectly reduces the cooling effect on the film in this area. In this way, multiple temperature monitors can automatically adjust the cooling effect of the film in their respective areas, thereby effectively improving the overall cooling uniformity of the film.

[0008] Furthermore, the two circulating pipes, together with the cooling chamber and the self-regulating circulating flow chamber, form a coolant circulating circuit. The coolant flows in the self-regulating circulating flow chamber in the opposite direction to the forward direction of the film. This allows the coolant and the film to form convection, which not only effectively improves the overall cooling effect, but also allows the film to cool in a stepped manner during its forward movement, which better avoids stress and deformation than rapid cooling.

[0009] Furthermore, the reset device includes a multi-fold edge sealing gasket, and bottom sealing gaskets are fixedly connected to both the upper and lower ends of the multi-fold edge sealing gasket. Multiple short elastic wires are fixedly connected to the upper and lower adjacent sides of the multi-fold edge sealing gasket, and multiple long elastic wires are fixedly connected between the upper and lower bottom sealing gaskets. The structure of the multi-fold edge sealing gasket has the characteristic of expansion and contraction, so that the upper push plate can move up and down when the coolant is filled and withdrawn. The rebound force of the short and long elastic wires can make the upper push plate automatically reset after the coolant is withdrawn.

[0010] Furthermore, the deformable waterproof membrane includes an elastic base membrane, and the upper surface of the elastic base membrane is coated with a waterproof coating. The deformable waterproof membrane serves to isolate the coolant, and the deformable waterproof membrane is elastic, so it does not affect the up and down movement of the upper push plate.

[0011] Optionally, the lower sidewall of the heat-conducting block has multiple equally spaced grooves, and an elastic sealing membrane is fixedly connected to the opening of the groove. A capacity adjustment column is slidably connected to the inner wall of the groove, and multiple connecting pouches are fixedly connected between the capacity adjustment column and the upper inner wall of the groove. Magnetic sheets are fixedly embedded in both the capacity adjustment column and the upper push plate, and the upper and lower magnetic sheets attract each other. When the micro bidirectional water pump fills the self-regulating circulating flow chamber with coolant, causing the upper push plate to move upward, in order to cooperate with the upper push plate to reduce the capacity of the self-regulating circulating flow chamber as quickly as possible, the upper push plate and the capacity adjustment column are magnetically attracted to each other. Thus, after the upper push plate moves upward, the capacity adjustment column can move downward and protrude due to the magnetic attraction, thereby allowing the capacity adjustment column to further reduce the capacity of the self-regulating circulating flow chamber, playing an auxiliary adjustment role, and effectively improving the cooling regulation efficiency.

[0012] Optionally, the connecting bladder includes an elastic bladder shell, and multiple symmetrically distributed rubber diaphragms are fixedly connected between the inner walls of the upper and lower ends of the elastic bladder shell. The rubber diaphragms allow the connecting bladder to deform back and forth by means of elasticity, so that the connecting bladder can be reset as soon as possible after the capacity adjustment column seat moves down. In addition, the connecting bladder also plays a role in limiting the capacity adjustment column seat.

[0013] Compared with the prior art, the advantages of this invention are: (1) In the existing process, the stretched film is moved forward along the contact heat-absorbing cooling plate. The contact heat-absorbing cooling plate absorbs the heat of the film and cools it. The contact heat-absorbing cooling plate transfers the heat to the heat-conducting block. The heat of the heat-conducting block is carried away by the circulating coolant, thereby effectively improving the cooling uniformity of the film. Multiple temperature monitors are used to monitor multiple areas of the film. The cooling effect is fed back by comparing the monitored value with the set value. The capacity of the self-regulating circulating flow chamber is adjusted by controlling the micro bidirectional water pump to inject coolant into the self-regulating circulating flow chamber. This allows for precise control of the cooling effect of each heat-conducting block, thereby effectively improving the cooling uniformity of the entire film and achieving cooling control of multiple areas of the film.

[0014] (2) During cooling, the stretched film is allowed to move forward along the contact heat-absorbing cooling plate. The contact heat-absorbing cooling plate absorbs the heat of the film and transfers it to the heat-conducting block. The heat-conducting block then transfers the heat to the circulating coolant, thereby cooling the film. Multiple temperature monitors are used to monitor the temperature of multiple areas of the film. The temperature value monitored by the temperature monitor is compared with the set value using the detection value and set value comparison module. When the temperature difference exceeds the threshold range, the adjustment module is triggered. The adjustment module starts the micro bidirectional water pump of the corresponding temperature monitor through the control processor to inject or extract coolant into the self-regulating circulating flow chamber. When the temperature monitored by the temperature monitor is higher than the set value, the micro bidirectional water pump will self-regulate. The coolant in the self-regulating circulating flow chamber is drawn outwards, thereby increasing the capacity of the chamber to hold more coolant and improving the cooling effect on the heat-conducting block. This indirectly improves the cooling effect on the film in this area. When the temperature monitored by the temperature monitor is lower than the set value, a miniature bidirectional water pump injects coolant into the self-regulating circulating flow chamber. The injection of coolant causes the deformable water-resistant membrane on the upper push plate to rise, thereby reducing the capacity of the self-regulating circulating flow chamber and reducing the amount of coolant it holds. This reduces the cooling effect on the heat-conducting block and indirectly reduces the cooling effect on the film in this area. In this way, multiple temperature monitors can automatically adjust the cooling effect of the film in their respective areas, thereby effectively improving the overall cooling uniformity of the film.

[0015] (3) The two circulating pipes, the cooling chamber and the self-regulating circulating flow chamber form a coolant circulating circuit. The coolant flows in the self-regulating circulating flow chamber in the opposite direction to the forward direction of the film. This allows the coolant and the film to form convection, which can not only effectively improve the overall cooling effect, but also the film is cooled in a step-like manner during its forward movement. This can better avoid stress and deformation than rapid cooling.

[0016] (4) The reset device includes a multi-fold edge sealing gasket, and the upper and lower ends of the multi-fold edge sealing gasket are fixedly connected with bottom sealing gaskets. Multiple short elastic wires are fixedly connected to the upper and lower adjacent sides of the multi-fold edge sealing gasket, and multiple long elastic wires are fixedly connected between the upper and lower bottom sealing gaskets. The structure of the multi-fold edge sealing gasket has the characteristic of expansion and contraction, so that the upper push plate can move up and down when the coolant is filled and drawn. The rebound force of the short elastic wires and long elastic wires can make the upper push plate automatically reset after the coolant is drawn.

[0017] (5) The deformable waterproof membrane includes an elastic base membrane, and the upper surface of the elastic base membrane is coated with a waterproof coating. The deformable waterproof membrane serves to isolate the coolant, and the deformable waterproof membrane is elastic, so it does not affect the up and down movement of the upper push plate.

[0018] (6) The lower sidewall of the heat-conducting block is provided with multiple equally spaced grooves, and the opening of the groove is fixedly connected with an elastic sealing membrane. The inner wall of the groove is slidably connected with a capacity adjustment column seat, and multiple connecting bladders are fixedly connected between the capacity adjustment column seat and the upper inner wall of the groove. Both the capacity adjustment column seat and the upper push plate are fixedly embedded with magnetic sheets, and the upper and lower magnetic sheets attract each other. When the micro bidirectional water pump fills the self-regulating circulating flow cavity with coolant and causes the upper push plate to move up, in order to cooperate with the upper push plate to reduce the capacity of the self-regulating circulating flow cavity as soon as possible, the upper push plate and the capacity adjustment column seat are magnetically attracted to each other. After the upper push plate moves up, the capacity adjustment column seat can be moved down and protruded by magnetic attraction, so that the capacity adjustment column seat can further reduce the capacity of the self-regulating circulating flow cavity and play an auxiliary adjustment role, thereby effectively improving the cooling regulation efficiency. (7) The connecting bladder includes an elastic bladder shell, and multiple symmetrically distributed rubber diaphragms are fixedly connected between the inner walls of the upper and lower ends of the elastic bladder shell. The rubber diaphragms allow the connecting bladder to deform back and forth by means of elasticity. In this way, the connecting bladder can be reset as soon as possible after the capacity adjustment column seat moves down. Moreover, the connecting bladder also plays a role in limiting the capacity adjustment column seat. Attached Figure Description

[0019] Figure 1 This is a process flow diagram of the present invention; Figure 2 This is a perspective view of the insulated box of the present invention; Figure 3 This is a front sectional view of the cooling control base of the present invention; Figure 4 This is a perspective view of the cooling control base of the present invention; Figure 5 This is a three-dimensional exploded view of the cooling control base of the present invention; Figure 6 This is a front view of the cooling control base of the present invention in its normal cooling working state; Figure 7 This is a front view of the cooling control base of the present invention in the cooling control working state; Figure 8 This is a perspective view of the resetter of the present invention; Figure 9 This is a comparison diagram of the deformation of the resetter before and after the invention. Figure 10 This is a cross-sectional view of the resetter of the present invention; Figure 11 for Figure 6 Enlarged view of point A in the middle; Figure 12 This is a comparison diagram of the deformation of the connecting pouch before and after the present invention.

[0020] The following are the labels in the diagram: 1. Insulation box; 2. Cooling control seat; 201. Cooling chamber; 202. Self-regulating circulating flow chamber; 3. Contact heat-absorbing cooling plate; 4. Heat-conducting block; 401. Groove; 5. Circulating pipe; 6. Water pump; 7. Semiconductor cooling chip; 8. Temperature monitor; 9. Resetter; 901. Multi-fold edge sealing gasket; 902. Bottom sealing gasket; 903. Short elastic filament; 904. Long elastic filament; 10. Deformable water-proof membrane; 11. Miniature bidirectional water pump; 12. Elastic sealing membrane; 13. Capacity adjustment column seat; 14. Connecting bladder; 1401. Elastic bladder shell; 1402. Rubber diaphragm. Detailed Implementation

[0021] The embodiments will be described clearly and completely with reference to the accompanying drawings. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0022] Example 1:

[0023] For a biaxial stretching molding process of beer label film, please refer to [link / reference]. Figure 1 This includes the following steps: S1, using five-layer co-extrusion technology, the various surface layers of the label film are simultaneously extruded through multiple extruders to form a molten film with a multi-layer structure; S2, the molten film is bidirectionally stretched through longitudinal and transverse stretching machines. The stretched film is first heat-treated to stabilize its structure, and then the film is introduced into a self-regulating cooling box for rapid cooling to fix the shape and properties of the film. S3, the processed film is trimmed of irregular edges by an edge trimmer, and finally the film is wound into a roll by a winding device; Please see Figure 2 , 3 4 and Figure 5The self-regulating cooling box in step S2 includes an insulated box 1, with conveying ports matching the film on both side walls of the insulated box 1. A cooling control seat 2 is fixedly connected to the bottom of the insulated box 1, and a contact heat-absorbing cooling plate 3 is fixedly connected to the top of the cooling control seat 2. The film is placed on top of the contact heat-absorbing cooling plate 3. Multiple equally spaced heat-conducting blocks 4 are fixedly connected to the lower side wall of the contact heat-absorbing cooling plate 3. The upper and lower inner walls of the cooling control seat 2 are respectively provided with a cooling cavity 201 and a self-regulating circulating flow cavity 202. The cooling cavity 201 is filled with coolant. Both sides of the cooling chamber 201 and the self-regulating circulating flow chamber 202 are connected to the circulating flow pipes 5, and a water pump 6 connected to the circulating flow pipes 5 is installed at the bottom of the cooling chamber 201. The two circulating flow pipes 5, the cooling chamber 201 and the self-regulating circulating flow chamber 202 form a coolant circulating flow loop. The direction of coolant flow in the self-regulating circulating flow chamber 202 is opposite to the direction of film advance. This allows the coolant and film to form convection, which can not only effectively improve the overall cooling effect, but also the film is cooled in a step-like manner during its advance, which can better avoid stress and deformation than rapid cooling. Please see Figure 6 , 8 9 and Figure 10 The heat-conducting block 4 extends into the self-regulating circulating flow cavity 202. Multiple semiconductor cooling chips 7 (specific models are selected based on actual needs and will not be described in detail here) are installed at the bottom of the cooling cavity 201. Multiple temperature monitors 8 (specific models are selected based on actual needs and will not be described in detail here) are installed on the upper inner wall of the insulation box 1. Multiple symmetrically distributed resetters 9 are fixedly connected to the lower inner wall of the self-regulating circulating flow cavity 202, and upper push plates are simultaneously fixedly connected to the upper ends of the multiple resetters 9. The resetters 9 include... The multi-fold edge sealing gasket 901 has a bottom sealing gasket 902 fixedly connected to both its upper and lower ends. Multiple short elastic wires 903 are fixedly connected to the upper and lower adjacent sides of the multi-fold edge sealing gasket 901, and multiple long elastic wires 904 are fixedly connected between the upper and lower bottom sealing gaskets 902. The structure of the multi-fold edge sealing gasket 901 has the characteristic of expansion and contraction, so that the upper push plate can move up and down when the coolant is filled and extracted. The rebound force of the short elastic wires 903 and the long elastic wires 904 can make the upper push plate automatically reset after the coolant is extracted. Please see Figure 6 , 7The inner wall of the self-regulating circulating flow cavity 202 is also fixedly connected to a deformable water-proof membrane 10, and the lower surface of the deformable water-proof membrane 10 is attached to the upper push plate. The deformable water-proof membrane 10 includes an elastic base membrane, and the upper surface of the elastic base membrane is coated with a waterproof coating. The deformable water-proof membrane 10 serves to isolate the coolant, and the deformable water-proof membrane 10 is elastic, so it does not affect the up-and-down movement of the upper push plate. The upper inner wall of the cooling cavity 201 is also equipped with multiple miniature bidirectional water pumps 11 facing the self-regulating circulating flow cavity 202, and the miniature bidirectional water pumps 11 are connected to the cooling cavity 201 and the self-regulating circulating flow cavity 202. The water pipes inside the moving cavity 202 and the insulation box 1 include a temperature monitoring module, a module for comparing detected and set values, and an adjustment module. The adjustment module is electrically connected to the micro bidirectional water pump 11 via a control processor (the specific connection structure and working principle are well-known to those skilled in the art and will not be described in detail here). During cooling, the stretched film moves forward along the contact heat-absorbing cooling plate 3. The contact heat-absorbing cooling plate 3 absorbs the heat from the film and transfers it to the heat-conducting block 4. The heat-conducting block 4 transfers the heat to the circulating coolant, thereby cooling the film. Multiple temperature monitors 8 are used to monitor the film for multiple... The temperature monitoring system uses a comparison module to compare the temperature value detected by the temperature monitor 8 with the set value. When the temperature difference exceeds a threshold, the adjustment module is triggered. The adjustment module, through the control processor, starts the miniature bidirectional water pump 11 of the corresponding temperature monitor 8 to inject or extract coolant into the self-regulating circulation chamber 202. When the temperature detected by the temperature monitor 8 is higher than the set value, the miniature bidirectional water pump 11 extracts coolant from the self-regulating circulation chamber 202 to increase its capacity and hold more coolant, thus improving the cooling effect on the heat transfer block. The cooling effect of the heat-conducting block 4 is indirectly improved, thus enhancing the cooling effect of the film in this area. When the temperature detected by the temperature monitor 8 is lower than the set value, the micro bidirectional water pump 11 injects coolant into the self-regulating circulating flow chamber 202. The injection of coolant causes the deformable water-resistant membrane 10 to be pushed on the upper push plate, thereby reducing the capacity of the self-regulating circulating flow chamber 202 and reducing the amount of coolant, thus reducing the cooling effect on the heat-conducting block 4 and indirectly reducing the cooling effect of the film in this area. In this way, multiple temperature monitors 8 can automatically adjust the cooling effect of the film in this area, thereby effectively improving the cooling uniformity of the film as a whole.

[0024] Example 2:

[0025] Based on Example 1, please refer to Figure 11 , 12The lower sidewall of the heat-conducting block 4 has multiple equally spaced grooves 401, and an elastic sealing membrane 12 is fixedly connected to the opening of the groove 401. A capacity adjustment column seat 13 is slidably connected to the inner wall of the groove 401, and multiple connecting pouches 14 are fixedly connected between the capacity adjustment column seat 13 and the upper inner wall of the groove 401. The connecting pouch 14 includes an elastic pouch shell 1401, and multiple symmetrically distributed rubber diaphragms 1402 are fixedly connected between the upper and lower inner walls of the elastic pouch shell 1401. The rubber diaphragms 1402 use elasticity to allow the connecting pouch 14 to deform back and forth, so that the connecting pouch 14 can quickly return to its original position after the capacity adjustment column seat 13 moves down. Moreover, the connecting pouch 14 also serves as... To limit the position of the capacity regulating column seat 13, both the capacity regulating column seat 13 and the upper push plate are fixedly embedded with magnetic sheets, and the upper and lower magnetic sheets attract each other. When the micro bidirectional water pump 11 fills the self-regulating circulating flow cavity 202 with coolant, causing the upper push plate to move upward, in order to cooperate with the upper push plate to reduce the capacity of the self-regulating circulating flow cavity 202 as quickly as possible, the upper push plate and the capacity regulating column seat 13 are magnetically attracted to each other. In this way, after the upper push plate moves upward, the magnetic attraction force can cause the capacity regulating column seat 13 to move downward and protrude, thereby allowing the capacity regulating column seat 13 to further reduce the capacity of the self-regulating circulating flow cavity 202, playing an auxiliary adjustment role, thereby effectively improving the cooling regulation efficiency. The above description is only the best embodiment of the present invention in combination with current practical needs, but the protection scope of the present invention is not limited thereto.

Claims

1. A biaxial stretching molding process for beer label films, characterized in that, Includes the following steps: S1, using five-layer co-extrusion technology, the various surface layers of the label film are simultaneously extruded through multiple extruders to form a molten film with a multi-layer structure; S2, the molten film is bidirectionally stretched through longitudinal and transverse stretching machines. The stretched film is first heat-treated to stabilize its structure, and then the film is introduced into a self-regulating cooling box for rapid cooling to fix the shape and properties of the film. S3, the processed film is trimmed of irregular edges by an edge trimmer, and finally the film is wound into a roll by a winding device; The self-regulating cooling box in step S2 includes an insulated box (1), and both sides of the insulated box (1) are provided with conveying ports that match the film. The bottom of the insulated box (1) is fixedly connected to a cooling control seat (2), and a contact heat-absorbing cooling plate (3) is fixedly connected above the cooling control seat (2). The film is placed above the contact heat-absorbing cooling plate (3). Multiple heat-conducting blocks (4) are fixedly connected to the lower side wall of the contact heat-absorbing cooling plate (3). Cooling chambers are respectively provided on the upper and lower inner walls of the cooling control seat (2). (201) and multiple self-regulating circulating flow chambers (202), the heat-conducting block (4) is arranged one-to-one with the self-regulating circulating flow chamber (202) below it, and the interior of the cooling chamber (201) is filled with coolant. Both sides of the cooling chamber (201) and the self-regulating circulating flow chamber (202) are connected to circulating flow pipes (5), and a water pump (6) connected to the circulating flow pipe (5) is installed at the bottom of the cooling chamber (201). The heat-conducting block (4) penetrates into the self-regulating circulating flow chamber (202), and multiple self-regulating circulating flow chambers (202) are installed at the bottom of the cooling chamber (201). The semiconductor cooling chip (7) has multiple temperature monitors (8) evenly spaced on the upper inner wall of the insulated box (1). Multiple symmetrically distributed resetters (9) are fixedly connected to the lower inner wall of the self-regulating circulating flow chamber (202), and upper push plates are fixedly connected to the upper ends of the resetters (9). A deformable water-resistant membrane (10) is also fixedly connected to the inner wall of the self-regulating circulating flow chamber (202), and the lower surface of the deformable water-resistant membrane (10) is in contact with the upper push plate. Multiple temperature monitors (8) facing the self-regulating circulating flow chamber (201) are also installed on the upper inner wall of the cooling chamber (201). The moving cavity (202) has a miniature bidirectional water pump (11), and the miniature bidirectional water pump (11) is connected to a water pipe extending into the cooling cavity (201) and the self-regulating circulating flow cavity (202). The insulation box (1) includes a temperature monitoring module, a detection value and set value comparison module and an adjustment module. The adjustment module is electrically connected to the miniature bidirectional water pump (11) through a control processor. The miniature bidirectional water pump (11) can inject or extract coolant into the cavity on the lower side of the push plate to adjust the capacity of the cavity on the upper side of the push plate, thereby precisely controlling the cooling effect of each heat-conducting block.

2. The biaxial stretching molding process for a beer label film according to claim 1, characterized in that, The two circulating pipes (5) together with the cooling chamber (201) and the self-regulating circulating flow chamber (202) form a coolant circulating circuit, and the coolant flows in the self-regulating circulating flow chamber (202) in the opposite direction to the forward direction of the film.

3. The biaxial stretching molding process for a beer label film according to claim 1, characterized in that, The resetter (9) includes a multi-fold edge sealing pad (901), and both the upper and lower ends of the multi-fold edge sealing pad (901) are fixedly connected to a bottom sealing pad (902). Multiple short elastic wires (903) are fixedly connected to the upper and lower adjacent sides of the multi-fold edge sealing pad (901), and multiple long elastic wires (904) are fixedly connected between the upper and lower bottom sealing pads (902).

4. The biaxial stretching molding process for a beer label film according to claim 1, characterized in that, The deformable waterproof membrane (10) includes an elastic base membrane, and the upper surface of the elastic base membrane is coated with a waterproof coating.

5. The biaxial stretching molding process for a beer label film according to claim 1, characterized in that, The lower sidewall of the heat-conducting block (4) is provided with a plurality of equally spaced grooves (401), and an elastic sealing membrane (12) is fixedly connected to the opening of the groove (401). A capacity adjustment column seat (13) is slidably connected to the inner wall of the groove (401), and a plurality of connecting pouches (14) are fixedly connected between the capacity adjustment column seat (13) and the upper inner wall of the groove (401). A magnetic sheet is fixedly embedded in both the capacity adjustment column seat (13) and the upper push plate, and the upper and lower magnetic sheets are magnetically attracted to each other.

6. The biaxial stretching molding process for a beer label film according to claim 5, characterized in that, The connecting bladder (14) includes an elastic bladder shell (1401), and multiple symmetrically distributed rubber diaphragms (1402) are fixedly connected between the inner walls of the upper and lower ends of the elastic bladder shell (1401).

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