A method for laterally sealing packaging material tubes using an ultrasonic sealing device, an anvil, and the ultrasonic sealing device.
By optimizing the frequency, amplitude, and pressure parameters of the ultrasonic sealing equipment, and by adjusting the dissipation area of the hysteresis loop, the problem of unstable sealing when the ultrasonic sealing equipment handles two- and three-layer packaging materials has been solved, achieving a more reliable and efficient lateral sealing effect.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TETRA LAVAL HOLDINGS & FINANCE SA
- Filing Date
- 2021-09-29
- Publication Date
- 2026-06-30
AI Technical Summary
Existing ultrasonic sealing equipment struggles to achieve reliable lateral sealing when handling two- or three-layer packaging materials, and the overlapping portions of the longitudinal seals are prone to deviating from their proper positions, resulting in unstable sealing quality.
By selecting appropriate frequency, amplitude, and pressure parameters, the various sub-parts of the packaging material reach the same temperature, and heat generation is controlled by adjusting the percentage of the dissipation area of the hysteresis loop. Ridge structures with equal height are used to process different layers of packaging material.
It achieves a more reliable and robust lateral seal, reduces overheating and cooling time, and improves seal quality and efficiency.
Smart Images
Figure CN116249649B_ABST
Abstract
Description
Technical Field
[0001] This invention relates to ultrasonic sealing technology, also known as ultrasonic welding technology. In particular, this invention relates to a method for laterally sealing a packaging material tube using an ultrasonic sealing device, an anvil for the ultrasonic sealing device, and the ultrasonic sealing device itself. Background Technology
[0002] As is well known, ultrasonic sealing technology, sometimes referred to as ultrasonic welding, is used in the food packaging industry. For roll-to-roll carton packaging machines, this technology can be used to form a transverse seal, that is, a welded section formed at the bottom of the packaging material tube containing the food, thus forming the package. Compared to induction sealing technology, sometimes called induction heating technology, the advantage of using ultrasonic sealing technology is that it can also be used with packaging materials that do not contain aluminum layers or other conductive materials.
[0003] For many roll-fed carton packaging machines, the packaging material is provided in the form of spokes wound on a spool. Forming the tube may include the following steps: unwinding the packaging material from the spool, sterilizing the packaging material to remove unwanted microorganisms, guiding the spokes such that an overlap is formed between a first side portion and a second side portion of the spokes, and sealing the first side portion and the second side portion together. Thus, the overlap comprises two layers of packaging material, while the remainder of the tube comprises one layer of packaging material.
[0004] The overlap formed during the longitudinal sealing process affects the transverse sealing. During transverse sealing, the tube is pressed together between the ultrasonic generator and the anvil of the ultrasonic sealing device. Due to the longitudinal sealing, the ultrasonic sealing device must be designed to handle both two-layer and three-layer packaging materials. With three layers of packaging material, more energy is required to achieve a reliable transverse seal compared to with two layers.
[0005] The challenge of processing two- and three-layer packaging materials to form a lateral seal in ultrasonic sealing equipment becomes more complex because the overlap caused by the longitudinal seal can shift out of place over time. This is now addressed by incorporating a so-called transition section in the ultrasonic sealing equipment, where two- and three-layer packaging materials can be adequately processed, but not optimally.
[0006] Although solutions exist for handling two- and three-layer packaging materials in ultrasonic sealing equipment, further improvements are needed to produce more reliable transverse seals from tubes of packaging material, including overlaps caused by longitudinal sealing, using ultrasonic sealing equipment. Summary of the Invention
[0007] One object of the present invention is to overcome, at least in part, one or more of the aforementioned limitations of the prior art. In particular, one object is to provide a more reliable, robust, and cost-effective lateral seal in cardboard-based packaging machines.
[0008] It is generally recognized that equal temperatures can be achieved in both two-layer and three-layer subsections by wisely selecting parameter values for the ultrasonic generator. This allows the use of uncompensated ridges, which in turn means improved robustness, less overheating, and reduced cooling and cycling times.
[0009] According to a first aspect, a method is provided for laterally sealing a tube of packaging material using an ultrasonic sealing device, wherein the packaging material may include cardboard and a plastic foil attached to the cardboard, wherein the plastic foil may face inward and the tube may include a longitudinal seal in which two layers of packaging material are stacked on top of each other, the method comprising:
[0010] The transverse sealing portion of the tube is placed between the ultrasonic generator and the anvil including a ridge, wherein the transverse sealing portion of the tube may include a first two-layer sub-part, a three-layer sub-part, and a second two-layer sub-part.
[0011] Ultrasonic acoustic vibrations with frequency and amplitude are transmitted from the ultrasonic generator to the transverse sealing portion, thereby causing heat generation in the cardboard, which in turn causes the plastic foil in the transverse sealing portion to melt.
[0012] Pressure is applied between the ultrasonic generator and the anvil to press the tube together, thereby causing the plastic foil of the transverse sealing portion to bond, thus forming a transverse seal.
[0013] The ridge of the anvil may include: a first two-layer sub-part for receiving the first two-layer sub-part of the tube; a first two-layer or three-layer sub-part for receiving the first two-layer sub-part or the three-layer sub-part of the tube; a three-layer sub-part for receiving the three-layer sub-part of the tube; a second two-layer or three-layer sub-part for receiving the three-layer sub-part or the second two-layer sub-part of the tube; and a second two-layer sub-part for receiving the second two-layer sub-part of the tube.
[0014] The ridge may have equal height in the first two-layer sub-section, the first two-layer or three-layer sub-section, the second two-layer or three-layer sub-section, and the second two-layer sub-section.
[0015] The combination of the frequency, amplitude, pressure, and characteristics of the cardboard can be selected to achieve equal temperatures in the first two-layer sub-section, the third-layer sub-section, and the second two-layer sub-section of the tube.
[0016] The combination can be selected such that the work / cycle (W) of the three-layer sub-sections of the transverse sealing portion is... 3层 The work / cycle (W) of the first two-layer sub-section or the second two-layer sub-section of the transverse sealing portion is equal to that of the transverse sealing portion. 2层 3 / 2 of ).
[0017] The combination of the frequency, amplitude, pressure, and properties of the packaging material can be used to reshape and reposition the adjusted two-layer and three-layer hysteresis loops in the adhesive network of the cardboard.
[0018] The method may further include:
[0019] The heat generation in the first and second two-layer portions of the transverse sealing portion is adjusted by continuously modifying the amplitude control and adjusting the percentage of the dissipation area of the two-layer hysteresis loop.
[0020] The frequency can be 20-50kHz, for example 29kHz.
[0021] The pressure (e.g., static pressure at the ridge / sealing location) can be higher than 20 MPa.
[0022] The amplitude can be 8-24 micrometers.
[0023] The ultrasonic acoustic vibrations are transmitted to the transverse sealing portion for 15-130 ms.
[0024] According to a second aspect, an anvil for an ultrasonic sealing device is provided, which is used to laterally seal a tube of packaging material, wherein the packaging material may include cardboard and a plastic foil attached to the cardboard, wherein the plastic foil may face inward and the tube may include a longitudinal seal in which two layers of packaging material are stacked on top of each other, the anvil comprising:
[0025] The ridge includes: a first two-layer sub-section for receiving the first two-layer sub-section of the tube; a first two-layer or three-layer sub-section for receiving the first two-layer sub-section or the three-layer sub-section of the tube; a three-layer sub-section for receiving the three-layer sub-section of the tube; a second two-layer or three-layer sub-section for receiving the three-layer sub-section or the second two-layer sub-section of the tube; and a second two-layer sub-section for receiving the second two-layer sub-section of the tube.
[0026] The ridge may have equal height in the first two-layer sub-section, the first two-layer or three-layer sub-section, the second two-layer or three-layer sub-section, and the second two-layer sub-section.
[0027] According to a third aspect, an ultrasonic sealing device is provided for a tube of transversely sealed packaging material, wherein the packaging material may include cardboard and plastic foil attached to the cardboard, wherein the tube may include a longitudinal sealing portion, wherein two layers of packaging material are stacked on top of each other and the plastic foil may face inward, the ultrasonic sealing device comprising:
[0028] An ultrasonic generator is arranged to transmit ultrasonic acoustic vibrations having a frequency and amplitude to a transverse sealing portion of the tube, thereby causing heat to be generated in the cardboard, which in turn causes the plastic foil in the transverse sealing portion to melt. The transverse sealing portion may include a first two-layer sub-section, a three-layer sub-section, and a second two-layer sub-section.
[0029] An anvil positioned opposite the ultrasonic generator, wherein the ridge may include: a first two-layer sub-section for receiving the first two-layer sub-section of the tube, a first two-layer or three-layer sub-section for receiving the first two-layer sub-section or the three-layer sub-section of the tube, a three-layer sub-section for receiving the three-layer sub-section of the tube, a second two-layer or three-layer sub-section for receiving the three-layer sub-section or the second two-layer sub-section of the tube, and a second two-layer sub-section for receiving the second two-layer sub-section of the tube.
[0030] The ridge may have equal height in the first two-layer sub-section, the first two-layer or three-layer sub-section, the second two-layer or three-layer sub-section, and the second two-layer sub-section.
[0031] Specifically, the combination of the frequency, amplitude, pressure, and characteristics of the cardboard is selected such that the temperatures in the first two-layer sub-section, the third-layer sub-section, and the second two-layer sub-section of the tube are equal.
[0032] The combination can be selected such that the work / cycle (W) of the three-layer sub-sections of the transverse sealing portion is... 3层 The work / cycle (W) of the first two-layer sub-section or the second two-layer sub-section of the transverse sealing portion is equal to that of the transverse sealing portion. 2层 3 / 2 of ).
[0033] The combination of the frequency, amplitude, pressure, and properties of the packaging material can be used to reshape and reposition the two-layer and three-layer hysteresis loops in the adhesive network of the cardboard.
[0034] The device may further include:
[0035] The control unit is configured to adjust the heat generation in the first two-layer portion and the second two-layer portion by continuously modifying the percentage of dissipation area of the adjusted two-layer hysteresis loop controlled by the amplitude.
[0036] The frequency can be 20-50kHz, for example 29kHz.
[0037] The amplitude can be 8-24 micrometers.
[0038] Other objects, features, aspects and advantages of the invention will become apparent from the following detailed description and the accompanying drawings. Attached Figure Description
[0039] Embodiments of the invention will now be described by way of example with reference to the accompanying schematic diagrams, wherein...
[0040] Figure 1 This illustrates the general principle of a roll-feed carton packaging machine.
[0041] Figure 2a , 2b Figures 2 and 2c illustrate three different scenarios that may occur when using a compensating anvil.
[0042] Figure 3 Examples show when using Figure 2a How the transverse sealing portion is affected when the -c compensation anvil is used.
[0043] Figure 4 The first and second dissipative hysteresis loops associated with the two-layer and three-layer sub-sections of the tube are shown.
[0044] Figure 5 The first and second compensated dissipative hysteresis loops associated with the two-layer and three-layer sub-sections of the tube are shown.
[0045] Figure 6 Uncompensated ridges are shown in the first two-layer sub-section, the first two-layer or three-layer sub-section, the second two-layer or three-layer sub-section, and the second two-layer sub-section.
[0046] Figure 7 This illustrates a three-dimensional view of the uncompensated ridge.
[0047] Figure 8 This is a flowchart illustrating the steps of a method for using a transverse sealing tube. Detailed Implementation
[0048] Figure 1 The general principle of a roll-feed packaging machine 100 is illustrated by example. In this example, a packaging material 102 is provided, comprising a cardboard 104 and a plastic foil 106 attached to the cardboard 104. The plastic foil 106 provides a barrier between the product, such as milk or orange juice, and the cardboard 104. Optionally, an outer plastic foil 108 may be attached to the outside of the cardboard 104 to protect the printed matter on the cardboard 104 and to prevent moisture from the surrounding environment.
[0049] Most commonly, packaging material 102 is fed onto a reel (not shown) to a packaging machine 100. As packaging material 102 is unwound from the reel, a web 110 is formed of packaging material 102. The web 110 may include a transverse sealing portion 112, which is a portion of packaging material 102 intended to be sealed together (sometimes referred to as welded together). Prior to this, a longitudinal seal 114 is formed by, for example, overlapping a first side portion of the web onto a second side portion and sealing them together. As a result of forming the longitudinal seal 114, a tube 116 is formed. The tube 116 may be filled with product such that the tube 116 can be transversely sealed when the product is held within it.
[0050] At the lower end of tube 116, an ultrasonic generator 118 and an anvil 120 may be provided. In this document, both are referred to as ultrasonic sealing device 121. As shown, the anvil 120 may be provided with ridges 122, 600, and 700. Figure 2a , 2b Ridges 122, 600, and 700 are shown in more detail in 2c, 3, 6, and 7.
[0051] Typically, the ultrasonic generator 118 emits vibrational sound waves that cause the cardboard 104 to heat up, thereby melting the plastic foil 106. By applying pressure to two opposite sides of the tube 116, the plastic foil 106 on both sides joins together to form a transverse seal 124. A knife (not shown) can be used to cut the transverse seal, thereby forming the bottom of one package and the top of another. The package 126 formed in this way during the transverse sealing process can then proceed to a folding device (not shown), wherein, for example, the package 126 is formed into a brick-shaped package.
[0052] As shown, a control unit 128 communicatively connected to the ultrasonic sealing device 121 can be provided. In this way, the frequency (f), amplitude (A), and pressure (P) can be modified so that, for example, equal temperatures can be provided in all portions of the transverse seal 124, and the temperature in the transverse sealing portion where the longitudinal seal 114 is provided will not be higher, for example, compared to the portion where the longitudinal seal 114 is not provided.
[0053] Figure 2a , 2b Figures 2c illustrate three different scenarios that may occur when using an anvil 120 with a ridge 122 having a deep central groove and shallower side grooves. The deep central groove is designed to compensate for the longitudinal seal 114 in the tube 116 containing the three layers of packaging material 102. By providing this deep central groove, pressure suitable for the three layers of packaging material 102 can be provided. As a result, the risk of damage to the packaging material 102 can be reduced.
[0054] The side grooves are provided to accommodate situations where the position of the longitudinal seal 114 may change. By providing side grooves that are not as deep as the deep center groove, both three-layer and two-layer packaging materials 102 can be accommodated with sufficient effectiveness.
[0055] Here, the different parts of the spine 122 are referred to as: a first two-layer sub-part 202, which is made to process two layers of packaging material; a first two-layer or three-layer sub-part 204, which is made to fully process two and three layers; a three-layer sub-part 206, which is made to process three layers; a second two-layer or three-layer sub-part 208, which is made to fully process two or three layers of packaging material 102; and a second three-layer sub-part 210, which is made to process two layers of packaging material.
[0056] like Figure 2a As shown, in a first case provided by way of example, the first two-layer sub-section 212 of tube 116 can interact with the first two-layer sub-section 202 and the main body of the first two-layer or three-layer sub-section 204 of ridge 122. The three-layer sub-section 214 of tube 116 can interact with a small portion of the first two-layer or three-layer sub-section 204, the three-layer sub-section 206 of ridge 122 and the main body of the second two-layer or three-layer sub-section 208 of ridge 122, while the second two-layer sub-section 216 of tube 116 can interact with a small portion of the second two-layer or three-layer sub-section 208 of ridge 122 and the two-layer sub-section 210 of ridge 122.
[0057] Figure 2b An example illustrates the second scenario. (Compared to...) Figure 2a Compared to the first case shown. In Figure 2a In the middle, the three-layer sub-section 214 of tube 116 moves to the left. Thus, the first two-layer sub-section 212 can interact with the two-layer sub-section 202 of ridge 112 and approximately half of the first two- or three-layer sub-section 204 of ridge 122. The three-layer sub-section 214 can interact with approximately half of the first two- or three-layer sub-section 204, approximately half of the three-layer sub-section 206, and approximately half of the second two- or three-layer sub-section 208. The second two-layer sub-section 216 can interact with approximately half of the second two- or three-layer sub-section 208 and the second two-layer sub-section 210.
[0058] like Figure 2cAs shown, in the third case, also presented as an example, the three-layer sub-part 214 can be shifted even further to the left. As a result, the first two-layer sub-part 212 can interact with a small portion of the first two-layer sub-part 202 and the first two- or three-layer sub-part 204 of the ridge 122. The three-layer sub-part 214 can interact with the majority of the first three-layer sub-part 204 of the ridge 122, the three-layer sub-part 206, and a small portion of the second two- or three-layer sub-part 208. The second two-layer sub-part 216 can interact with the second two- or three-layer sub-part 208 and the majority of the second two-layer sub-part 210 of the ridge 122.
[0059] As described above, the first and second two- or three-layer sub-parts 204, 208 allow the first and second two-layer sub-parts 212, 216 and the three-layer sub-part 214 to be processed. However, while processing the first and second two- or three-layer sub-parts 204, 208 may be sufficient, it is not as good as processing, for example, the first two-layer sub-part 212 of the tube by the first two-layer sub-part 202 of the ridge 122 or processing the three-layer sub-part 214 of the tube 116 by the three-layer sub-part 206 of the ridge 122.
[0060] Figure 3 An example illustrates how the transverse sealing portion 112 can be sealed using the ridge 122. In the first region 300, the first two-layer sub-portion 202 of the tube 116 is already sealed by the first two-layer sub-portion 212 of the ridge 122 (sometimes referred to as the uncompensated ridge region). The sealing temperature in this first region 300 reaches a sufficient temperature range to allow the plastic foil 106 to fully melt and achieve a reliable seal. In the second region 302 of the transverse sealing portion 112, the first two-layer sub-portion 212 of the tube is sealed by the two or three layers of the ridge 122, which may result in underheating, i.e., not reaching a sufficient temperature range, resulting in an insufficient seal in this second region 302. In the third region 304, overheating may occur, i.e., the temperature exceeds the appropriate temperature range, since the three-layer sub-portion 214 is sealed by the first two or three layers of the ridge 122. The result of overheating may be that too much of the plastic foil 106 melts, thereby reducing the seal quality. Finally, in the fourth region 306, the three-layer sub-section 214 of the tube 116 is sealed by the three-layer sub-section 206 of the ridge 122, resulting in a sufficient temperature range and a reliable seal.
[0061] Figure 4 A simplified mechanical representation of cardboard 104 under compression is shown. The static network determines the static load. The viscous network controls the response under high-frequency oscillations. Ultrasonic sealing involves two mechanisms that occur simultaneously and in parallel.
[0062] When using, such as Figure 2a When ridge 122 is shown in -c and 3, as in Figure 4In the stress (σ) versus nominal strain (ε) graph shown, the desired heating effect in the ultrasonic seal is based on a first dissipative hysteresis loop 400 in the adhesive network of the cardboard 104 associated with the first and second two-layer sub-sections 212, 216 of the tube 116, and a second dissipative hysteresis loop 402 associated with the three-layer sub-section 214 of the tube 116. The energy (also known as work (W)) induced in the packaging material 104 (primarily cardboard 102) by the first dissipative hysteresis loop 402 is cut off due to the skipping of the ultrasonic generator 118, i.e., wasted potential energy. In other words, the relatively low pressure combined with the relatively high amplitude on the first and second two-layer sub-sections 212, 216 causes the ultrasonic generator 118 to skip in the air during a portion of its oscillation cycle, thus missing potential heating.
[0063] like Figure 5 As shown, it has been found that by reducing the amplitude and increasing the static pressure, the adjusted two-layer hysteresis loop 500 associated with the first and second two-layer sub-sections 212, 216 of tube 116 and the adjusted three-layer hysteresis loop 502 associated with the three-layer sub-section 214 of tube 116 appearing in the uncompensated region, corresponding to the third region 304, can move deeper into the third quadrant of the stress (σ) versus nominal strain (ε) graph. To compensate for the smaller resulting hysteresis loop, the frequency can be increased. With these modifications, combinations of amplitude, static pressure, frequency, and cardboard 104 can be made such that equal temperatures can be generated along the uncompensated ridge. This provides enhanced robustness, reduced risk of overheating, and reduced cooling / cycle time.
[0064] Optionally, the heat generation in the first two-layer portion 212 and the second two-layer portion 214 of the transverse sealing portion 112 can be adjusted by controlling the dissipation area percentage 504 of the adjusted two-layer hysteresis loop 500 via, for example, by continuously adjusting the amplitude A.
[0065] Figure 6 The diagram shows uncompensated ridges 600 in the first two-layer sub-section 602, the first two-layer or three-layer sub-section 604, the second two-layer or three-layer sub-section 608, and the second two-layer sub-section 610. In other words, these sub-sections can have a height H. As described above, by using... Figure 6 The ridge 600 shown, and the frequency, amplitude, and static pressure of the ultrasonic generator 118, are selected in conjunction with... Figure 2a The disadvantages associated with ridge 122 shown in -c are avoidable. As shown, the three-layer sub-section 606 of ridge 600 can be provided with grooves, i.e., it can have different heights H', which are less than the height H. The reason for having grooves can be to avoid damage to the packaging material 102.
[0066] As shown in the figure, the side portion 612 may be provided with a groove 614 that aligns with the first two- or three-layer sub-parts 604, the three-layer sub-parts 606, and the second two- or three-layer sub-parts 608. The advantage of the groove 614 in the side portion 612 is that it can avoid or at least reduce damage to the packaging material 102 caused by the side portion 612.
[0067] Figure 7 The ridge 700, which is also uncompensated in the three-layer sub-section, is shown. Similar to... Figure 6 The side portion 612 shown, with its first and second sides 702 and 704 positioned adjacent to the ridge 700, can be provided with a recess 706. One advantage of this recess 706 is that it can be positioned such that the three-layer sub-parts 214 of the packaging material 102 interact with it during lateral sealing. By doing so, the risk of damage to the packaging material 102 can be reduced.
[0068] Figure 8 This is a flowchart illustrating the steps of a method 800 for a transverse sealing tube 116. In the first step 802, the transverse sealing portion 112 can be placed between the ultrasonic generator 118 and the anvil 120. In the second step 804, ultrasonic acoustic vibrations can be transmitted from the ultrasonic generator 118 to the transverse sealing portion 112. In the third step 806, the tube 116 can be pressed between the ultrasonic generator 118 and the anvil 120. Optionally, in the fourth step 808, the heat generation in the first two-layer portions 212 and the second two-layer portions 214 of the transverse sealing portion 112 can be adjusted by controlling the dissipation area percentage 504 of the two hysteresis loops.
[0069] Although the general principle of the roll-feed packaging machine 100 has been introduced, the ultrasonic device 121 is not limited to this type of packaging machine, but can be used in different types of packaging machines under similar conditions. For example, the ultrasonic sealing device 121 can also be used in a preform-feed packaging machine, i.e., a filling machine, in which the packaging material 102 can be provided in the form of a flat-folded pre-cut tube element.
[0070] As can be seen from the above description, although various embodiments of the present invention have been described and shown, the present invention is not limited thereto, but may be embodied in other ways within the scope of the subject matter defined by the appended claims.
Claims
1. A method (800) for laterally sealing a tube (116) of packaging material (102) using an ultrasonic sealing device (121), wherein the packaging material (102) comprises cardboard (104) and plastic foil (106) attached to the cardboard (104), wherein the plastic foil (106) faces inward and the tube (116) includes a longitudinal seal (114) in which two layers of packaging material are stacked on top of each other, the method comprising: The transverse sealing portion (112) of the tube (116) is placed between the ultrasonic generator (118) and the anvil (120) including ridges (600, 700), wherein the transverse sealing portion (112) of the tube (116) includes a first two-layer sub-part (212), a three-layer sub-part (214), and a second two-layer sub-part (216). Ultrasonic vibrations with frequency (f) and amplitude (A) are transmitted from the ultrasonic generator (118) to the transverse sealing portion (112), resulting in heat generation in the cardboard (104), which in turn causes the plastic foil (106) in the transverse sealing portion (112) to melt, and Pressure (P) is applied between the ultrasonic generator (118) and the anvil (120) to press the tube (116) together, thereby causing the plastic foil (106) of the transverse sealing portion (112) to bond, thus forming a transverse sealing portion (124). The ridges (600, 700) of the anvil (120) include: a first two-layer sub-part (602) for receiving the first two-layer sub-part (212) of the tube (116); a first two-layer or three-layer sub-part (604) for receiving the first two-layer sub-part (212) or the three-layer sub-part (214) of the tube (116); a three-layer sub-part (606) for receiving the three-layer sub-part (214) of the tube (116); a second two-layer or three-layer sub-part (608) for receiving the three-layer sub-part (214) or the second two-layer sub-part (216) of the tube (116); and a second two-layer sub-part (610) for receiving the second two-layer sub-part (216) of the tube (116). The ridges (600, 700) have equal height (H) in the first two-layer sub-section (602), the first two-layer or three-layer sub-section (604), the second two-layer or three-layer sub-section (608), and the second two-layer sub-section (610). Specifically, the combination of the frequency (f), amplitude (A), pressure (P), and characteristics of the cardboard (104) is selected such that the temperatures in the first two-layer sub-section (212), the three-layer sub-section (214), and the second two-layer sub-section (216) of the tube (116) are equal. The combination of the frequency (f), the amplitude (A), the pressure (P), and the properties of the packaging material (102) is used to reshape and reposition the adjusted two-layer hysteresis loop (500) and the adjusted three-layer hysteresis loop (502) in the adhesive network of the cardboard (104).
2. The method according to claim 1, wherein, Choosing the combination results in a work / cycle (W) of the three-layer sub-section (214) of the transverse sealing portion (112). 3层 The work / cycle (W) of the first two-layer sub-section (212) or the second two-layer sub-section (216) of the transverse sealing portion (112) is equal to that of the transverse sealing portion (112). 2层 3 / 2 of ) 3. The method according to claim 1 or 2, further comprising: Heat generation in the first two-layer sub-section (212) and the second two-layer sub-section (216) of the transverse sealing portion (112) is adjusted by continuously modifying the amplitude (A) to control the dissipation area percentage (504) of the adjusted two-layer hysteresis loop (500).
4. The method according to claim 1 or 2, wherein the frequency (f) is 20-50 kHz.
5. The method according to claim 4, wherein the frequency (f) is 29 kHz.
6. The method according to claim 1 or 2, wherein the pressure (P) is higher than 20 MPa.
7. The method according to claim 1 or 2, wherein the amplitude (A) is 8-24 micrometers.
8. The method according to claim 1 or 2, wherein, The ultrasonic acoustic vibrations are transmitted to the transverse sealing portion (112) for 15-130 ms.
9. An anvil (120) for an ultrasonic sealing device (121) for laterally sealing a tube (116) of packaging material (102) using the ultrasonic sealing device (121), wherein the packaging material (102) comprises cardboard (104) and plastic foil (106) attached to the cardboard (104), wherein the plastic foil (106) faces inward and the tube (116) includes a longitudinal seal (114) in which two layers of packaging material are stacked on top of each other, the anvil (120) comprising: Ridges (600, 700) include: a first two-layer sub-section (202) for receiving a first two-layer sub-section (212) of the tube (116); a first two-layer or three-layer sub-section (204) for receiving the first two-layer sub-section (212) or a three-layer sub-section (214) of the tube (116); a three-layer sub-section (606) for receiving a three-layer sub-section (214) of the tube (116); a second two-layer or three-layer sub-section (208) for receiving a three-layer sub-section (214) or a second two-layer sub-section (216) of the tube (116); and a second two-layer sub-section (210) for receiving a second two-layer sub-section (216) of the tube (116). The ridges (600, 700) have equal heights (H) in the first two-layer sub-section (602), the first two-layer or three-layer sub-section (604), the second two-layer or three-layer sub-section (608), and the second two-layer sub-section (610).
10. An ultrasonic sealing device (121) for a tube (116) of a transversely sealed packaging material (102), wherein, The packaging material (102) includes cardboard (104) and plastic foil (106) attached to the cardboard (104), wherein the tube (116) includes a longitudinal seal (114), wherein two layers of packaging material (102) are stacked on top of each other and the plastic foil (106) faces inward, and the ultrasonic sealing device (121) includes: An ultrasonic generator (118) is arranged to transmit ultrasonic acoustic vibrations having a frequency (f) and an amplitude (A) to a transverse sealing portion (112) of the tube (116), thereby causing heat generation in the cardboard (104), which in turn causes the plastic foil (106) in the transverse sealing portion (112) to melt, wherein the transverse sealing portion (112) comprises a first two-layer sub-section (212), a three-layer sub-section (214), and a second two-layer sub-section (216). An anvil (120) positioned opposite the ultrasonic generator (118) includes, in which the ridge (600, 700) comprises: a first two-layer sub-section (602) for receiving the first two-layer sub-section (212) of the tube (116); a first two-layer or three-layer sub-section (604) for receiving the first two-layer sub-section (212) or the three-layer sub-section (214) of the tube (116); a three-layer sub-section (606) for receiving the three-layer sub-section (214) of the tube (116); a second two-layer or three-layer sub-section (608) for receiving the three-layer sub-section (214) or the second two-layer sub-section (216) of the tube (116); and a second two-layer sub-section (610) for receiving the second two-layer sub-section (216) of the tube (116). The ridges (600, 700) have equal height (H) in the first two-layer sub-section (602), the first two-layer or three-layer sub-section (604), the second two-layer or three-layer sub-section (608), and the second two-layer sub-section (610). Specifically, the combination of the frequency (f), amplitude (A), pressure (P), and characteristics of the cardboard (104) is selected such that the temperatures in the first two-layer sub-section (212), the three-layer sub-section (214), and the second two-layer sub-section (216) of the tube (116) are equal. The combination of the frequency (f), the amplitude (A), the pressure (P), and the properties of the packaging material (102) is used to reshape and reposition the adjusted two-layer hysteresis loop (500) and the adjusted three-layer hysteresis loop (502) in the adhesive network of the cardboard (104).
11. The device according to claim 10, wherein, Choosing the combination results in a work / cycle (W) of the three-layer sub-section (214) of the transverse sealing portion (112). 3层 The work / cycle (W) of the first two-layer sub-section (212) or the second two-layer sub-section (216) of the transverse sealing portion (112) is equal to that of the transverse sealing portion (112). 2层 3 / 2 of ) 12. The device according to claim 10 or 11, further comprising: The control unit (128) is configured to adjust the heat generation in the first two-layer sub-section (212) and the second two-layer sub-section (216) by controlling the dissipation area percentage (504) of the adjusted two-layer hysteresis loop (502) via continuously modifying the amplitude (A).
13. The device according to claim 10 or 11, wherein the frequency (f) is 20-50 kHz.
14. The device of claim 13, wherein the frequency (f) is 29 kHz.
15. The device according to claim 10 or 11, wherein the amplitude (A) is 8-24 micrometers.