Soft label stripping mechanism for pneumatic labeling machine and working method of soft label stripping mechanism

Abstract

The invention discloses a soft label stripping mechanism for a pneumatic labeling machine and a working method of the soft label stripping mechanism, the soft label stripping mechanism comprises a conveying mechanism for conveying a label belt, a label pre-separation mechanism and a stripping labeling mechanism, and the label belt is a thermosensitive label belt; the label pre-separation mechanism comprises a heating mechanism used for heating a label belt to reduce viscosity between a label and the label belt, the stripping and labeling mechanism comprises an airflow generating device, and the airflow generating device is connected with a labeling plate capable of adsorbing the label under negative pressure. According to the design from pretreatment of the label belt to the label adsorption negative pressure opening, the problems that when a traditional pneumatic labeling machine is used for labeling soft labels, the viscidity is too high, and the negative pressure is too large, the labels are sunken, bubbles exist, and the like are effectively solved, so that the label quality and the labeling efficiency are improved.

Description

Technical Field

[0001] The invention relates to the technical field of labeling machine equipment, and in particular to a soft label peeling mechanism for a pneumatic labeling machine and a working method thereof. Background Art

[0002] A labeling machine is a device used to automatically attach labels to the surface of products, packages or containers. Labeling machines are widely used in food, beverages, cosmetics, pharmaceuticals, daily chemicals, chemicals and other industries to improve production efficiency and ensure accurate label attachment.

[0003] According to different application scenarios and labeling requirements, labeling machines can be divided into many types, one of which is a pneumatic labeling machine. When working, this pneumatic labeling machine absorbs the labels on the label tape onto the labeling plate through negative pressure, and then moves the labeling plate to stick the labels to the objects. For example, the patent with authorization announcement number CN218432192U discloses a pneumatic labeling device with material tape collection, including a lower bottom plate, a support plate, an upper bottom plate, a guide clamping assembly, a material tape collecting device and a labeling cylinder. The support plate is arranged on the lower bottom plate, the upper bottom plate is arranged on the support plate, the upper bottom plate and the lower bottom plate are arranged opposite to each other, the material tape collecting device is arranged at a corner of the upper bottom plate, and the end of the upper bottom plate opposite to the material tape collecting device is fixedly equipped with a label tray for winding labels, the upper bottom plate and the corner on the diagonal of the material tape collecting device are fixedly equipped with a servo motor, the labeling cylinder is arranged in the middle of the upper bottom plate, and the front end of the labeling cylinder is fixedly equipped with a vacuum suction plate, and the vacuum suction plate is arranged at the diagonal where the label tray and the servo motor are connected.

[0004] Although the pneumatic labeling machine of the above structure can meet the labeling tasks in most cases, the following problems still exist: In the pneumatic labeling machine, the main task of the labeling plate is to absorb the label from the label tape and accurately deliver the label to the labeling position. In order to complete this adsorption process, the labeling plate usually needs to absorb the label from the label tape through negative pressure. However, since the label itself has a certain viscosity, especially when there is a certain adhesion between the label and the label tape, the labeling plate needs a large negative pressure to overcome this adhesion and smoothly absorb the label. However, when the negative pressure is too large, especially for soft labels, some adverse effects will occur. Soft labels are easily affected by excessive suction during the adsorption process, resulting in depression or local deformation of the label surface. Such depressions not only affect the appearance and quality of the label, but may also cause bubbles, wrinkles or offsets during the labeling process, thereby affecting the overall labeling effect. Summary of the invention

[0005] Purpose of the invention: The purpose of the present invention is to provide a soft label peeling mechanism for a pneumatic labeling machine and a working method thereof.

[0006] Technical solution:

[0007] A soft label peeling mechanism for a pneumatic labeling machine comprises a conveying mechanism for conveying a label tape, a label pre-separation mechanism and a label peeling mechanism, wherein the label tape is a heat-sensitive label tape, the label pre-separation mechanism comprises a heating mechanism for heating the label tape to reduce the stickiness between the labels, and the label peeling mechanism comprises an airflow generating device, wherein the airflow generating device is connected to a labeling plate capable of negative pressure adsorbing the label.

[0008] A main invention of the present invention is to realize rapid reduction of adhesion between a label and a label tape by combining a label pre-separation mechanism with a heat-sensitive label tape.

[0009] Furthermore, the labeling plate is provided with a plurality of micro negative pressure ports, all of which are commonly connected to the airflow generating device, and the micro negative pressure ports located on the outside of the labeling plate are arranged obliquely outward along the negative pressure direction. With this structure, the labeling plate can generate a certain lateral pulling force on the label during the adsorption process, so that the label can be flatly adsorbed on the labeling plate.

[0010] Furthermore, the negative pressure formed within the unit area of ​​the labeling plate gradually decreases from the center to the outside. The negative pressure on the labeling plate gradually decreases from the center to the outside, forming a negative pressure gradient. This means that during the label adsorption process, the adsorption force in the central area is stronger and the adsorption force in the peripheral area is weaker, ensuring that the label is evenly stressed during adsorption and reducing label depression caused by excessive adsorption. At the same time, with the inclined outer micro-negative pressure port, the middle label can reach the labeling plate first during the adsorption process, and naturally fit under the action of the lateral pulling force without generating bubbles. At the same time, the larger suction force in the center can keep the center of the label aligned, avoiding the label from shifting or misaligning during the adsorption process, thereby improving the labeling accuracy. In addition, the edges of labels are often fragile, especially when handling soft labels. The design of gradually decreasing negative pressure from the center to the outside can effectively avoid the following problems: (1) Avoid uneven force on the middle and edges of the label. If the suction force on the entire labeling plate is the same, the middle of the label will be subjected to stronger force than the edge, causing the center of the label to be overstretched or deformed, while the edge does not receive sufficient adsorption force. This uneven suction force can cause the label to deform or wrinkle; (2) Reduce the risk of deformation or tearing of the label edge. The smaller suction force on the outside avoids edge shrinkage or tearing caused by excessive adsorption of the label edge. Especially when using soft labels, the edge of the label is more susceptible to damage.

[0011] Furthermore, the number of micro negative pressure ports per unit area of ​​the labeling plate gradually decreases from the center to the outside.

[0012] Furthermore, the aperture of the micro negative pressure port of the labeling plate gradually increases from the center to the outside. When the number of micro negative pressure ports gradually decreases from the center to the outside, a larger arrangement space is provided for each micro negative pressure port, so the aperture can be increased to a certain extent, so that the same pressure is shared on a larger label area, thereby reducing problems such as damage to the label and dents.

[0013] Furthermore, the heating mechanism is an infrared heater or a microwave heater. Compared with hot air heating, the instability caused by hot air during the label tape conveying process can be avoided.

[0014] Furthermore, the label pre-separation mechanism also includes a visual sensor mechanism for real-time feedback of the heating effect, detection of the bonding effect between the two, and real-time temperature control.

[0015] Furthermore, the conveying mechanism includes at least two conveying rollers forming a horizontal conveying direction, the peeling and labeling mechanism is arranged at the upper end of the conveying position, and the heating mechanism is arranged at the lower end of the conveying position.

[0016] Furthermore, the thermal label tape is made of thermal PET or thermal BOPP.

[0017] On this basis, the present invention also discloses a working method of a soft label peeling mechanism for a pneumatic labeling machine, comprising the following steps:

[0018] 1) The conveying mechanism drives the label belt to move and convey the label to the lower end of the peeling and labeling mechanism;

[0019] 2) The heating mechanism heats the label conveyor belt from below, and cooperates with the heat-sensitive material of the heat-sensitive label belt to quickly complete the pre-separation of the label and the label belt;

[0020] 3) The airflow generating device provides negative pressure to the micro negative pressure port on the labeling plate to adsorb the pre-separated labels. In this process, since the negative pressure on the labeling plate gradually decreases from the center to the outside, a negative pressure gradient is formed. The adsorption force in the center area is stronger, and the adsorption force in the outer area is weaker. At the same time, the micro negative pressure port located on the outside of the labeling plate is inclined outward along the negative pressure direction, which can enable the labeling plate to generate a certain lateral pulling force on the label during the adsorption process, so that the middle label can reach the labeling plate first during the adsorption process and naturally fit under the action of the lateral pulling force.

[0021] Beneficial effect: The soft label peeling mechanism for the pneumatic labeling machine of the present invention effectively solves the problems of excessive viscosity and label depression and bubbles caused by excessive negative pressure encountered by traditional pneumatic labeling machines in soft label labeling, from the pretreatment of the label tape to the design of the label adsorption negative pressure port, thereby improving the label quality and labeling efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 The first embodiment of the present invention is a three-dimensional Figure 1 ;

[0023] Figure 2 The first embodiment of the present invention is a three-dimensional Figure 2 ;

[0024] Figure 3 is a side view of a first embodiment of the present invention;

[0025] Figure 4 It is a structural schematic diagram of a labeling plate according to a first embodiment of the present invention;

[0026] Figure 5 is a cross-sectional schematic diagram of a labeling plate according to a first embodiment of the present invention;

[0027] Figure 6 It is a schematic structural diagram of a labeling plate according to a second embodiment of the present invention. DETAILED DESCRIPTION

[0028] In order to make the technical solution of the present invention clearer, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0029] Example 1

[0030] like Figure 1-5 As shown, in the first embodiment of the present invention, a soft label peeling mechanism for a pneumatic labeling machine includes a conveying mechanism 1 for conveying a label tape, a label pre-separation mechanism 2 and a peeling labeling mechanism 3, wherein the label tape is a thermal label tape, the label pre-separation mechanism 2 includes a heating mechanism 21 for heating the label tape to reduce the adhesion between the labels, and the peeling labeling mechanism 3 includes an airflow generating device 31, and the airflow generating device is connected to a labeling plate 32 capable of negative pressure adsorbing labels.

[0031] The label tape conveying mechanism is responsible for conveying the label tape stably to ensure that the label tape passes through the labeling machine smoothly. On the conveying path, the label tape will not produce unstable fluctuations due to tension or external interference, ensuring the accurate conveying of the label, and generally includes at least an unwinding roller 11, a conveying roller 12, a winding roller 13 and a tensioning roller.

[0032] The airflow generating device 31 provides a stable airflow to generate negative pressure, thereby adsorbing the label. Its function is to ensure that the label can be peeled off from the label tape smoothly and fixed on the labeling plate to be attached to the target surface. The design of the airflow generating device needs to ensure stable airflow to avoid excessive local suction during the label adsorption process.

[0033] During the conveying process of the label tape, the function of the pre-separation mechanism 2 is to reduce the adhesion between the label and the label tape by heating. This is a key step to solve the problem of strong stickiness of soft labels. By heating the label tape, the adhesive on the label tape can be made softer, reducing the adhesion between the label and the tape, making it easier for the label to be peeled off from the label tape. Of course, a label tape made of heat-sensitive material can achieve rapid pre-separation to ensure the overall labeling speed.

[0034] In this embodiment, the labeling plate 32 is provided with a plurality of micro negative pressure ports 321, all of which are connected to the airflow generating device, and the micro negative pressure ports 321 located on the outer side of the labeling plate 32 are arranged obliquely outward along the negative pressure direction. With this structure, the labeling plate can generate a certain lateral pulling force on the label during the adsorption process, so that the label can be adsorbed on the labeling plate flatly.

[0035] In this embodiment, the negative pressure formed within the unit area of ​​the labeling plate 32 gradually decreases from the center to the outside. The negative pressure on the labeling plate gradually decreases from the center to the outside, forming a negative pressure gradient. This means that during the label adsorption process, the adsorption force in the central area is stronger and the adsorption force in the peripheral area is weaker, ensuring that the label is evenly stressed during adsorption and reducing the label depression caused by excessive adsorption. At the same time, with the inclined outer micro-negative pressure port, the middle label can reach the labeling plate first during the adsorption process, and naturally fit under the action of the lateral pulling force without generating bubbles. At the same time, the larger suction force in the center can keep the center of the label aligned, avoiding the label from being offset or misaligned during the adsorption process, thereby improving the labeling accuracy. In addition, the edges of labels are often fragile, especially when handling soft labels. The design of gradually decreasing negative pressure from the center to the outside can effectively avoid the following problems: (1) Avoid uneven force on the middle and edges of the label. If the suction force on the entire labeling plate is the same, the middle of the label will be subjected to stronger force than the edge, causing the center of the label to be overstretched or deformed, while the edge does not receive sufficient adsorption force. This uneven suction force can cause the label to deform or wrinkle; (2) Reduce the risk of deformation or tearing of the label edge. The smaller suction force on the outside avoids edge shrinkage or tearing caused by excessive adsorption of the label edge. Especially when using soft labels, the edge of the label is more susceptible to damage.

[0036] In this embodiment, the number of micro-negative pressure ports per unit area of ​​the labeling plate 32 gradually decreases from the center to the outside. This is a solution for achieving a gradual decrease in negative pressure from the center to the outside when the airflow generating device 31 provides the same negative pressure to each micro-negative pressure port.

[0037] In this embodiment, the heating mechanism 21 is an infrared heater or a microwave heater. These two heating methods are more accurate and uniform compared to hot air heating, and avoid temperature fluctuations or unstable label tape conveying that may be caused during hot air heating.

[0038] In this embodiment, the label pre-separation mechanism 2 also includes a visual sensor mechanism for real-time feedback of the heating effect, detection of the bonding effect between the two, and real-time temperature control. The sensor is used to monitor the bonding effect between the label and the label tape in real time to ensure accurate control of the heating process. By feeding back the sticky state between the label tape and the label, the system can adjust the heating temperature in real time to ensure that the label can be successfully peeled off under appropriate adhesion to prevent overheating or underheating.

[0039] In this embodiment, the conveying mechanism 1 includes at least two conveying rollers 11 forming a horizontal conveying direction. The peeling and labeling mechanism is arranged at the upper end of the conveying position, and the heating mechanism is arranged at the lower end of the conveying position. This structure allows negative pressure adsorption to be performed directly after the pre-separation is completed, avoiding the need for the conveying mechanism to transport in sequence. Of course, the heating mechanism can also be arranged at the front end of the peeling and labeling mechanism, and the two steps are performed in different positions. It should be noted that the position of the subsequent conveying roller needs to avoid the heating mechanism to avoid the subsequent label tape from continuing to move to the upper end of the heating mechanism to form an obstruction.

[0040] In this embodiment, the thermal label tape is made of thermal PET or thermal BOPP. The label tapes of these two materials have good thermal sensitivity and are well suited for the solution of controlling label peeling by thermal energy. Labels made of thermal PET and BOPP materials can be more easily peeled off from the label tape under appropriate heating conditions, and are not easily deformed or torn during the peeling process, which is very suitable for this delicate labeling operation.

[0041] It can be understood that the peeling and labeling mechanism also needs to be connected to a two-axis moving mechanism 4 or a three-axis moving mechanism to realize its moving adsorption and labeling. The two-axis moving mechanism and the three-axis moving mechanism are commonly used in the prior art and will not be described in detail here.

[0042] At the same time, a rotating station 5 can be arranged at the side end to cooperate with the moving mechanism to realize labeling.

[0043] Example 2

[0044] like Figure 6 As shown, the aperture of the micro negative pressure port of the labeling plate 32 gradually increases from the center to the outside, and the number of micro negative pressure ports 321 gradually decreases from the center to the outside, which gives the unit micro negative pressure port a larger arrangement space, so the aperture can be increased to a certain extent, so that the same pressure is shared on a larger label area, to reduce problems such as damage and dents to the label.

[0045] The number and aperture size of the micro negative pressure ports 321 are also gradually distributed on the labeling plate, gradually decreasing from the center to the outer edge. This design allows the adsorption force of the labeling plate to be better controlled during the adsorption process, avoiding unnecessary depressions or bubbles in the label due to excessive negative pressure, while ensuring that the label is stably adsorbed during the entire labeling process.

[0046] Example 3

[0047] On this basis, the present invention also discloses a working method of a soft label peeling mechanism for a pneumatic labeling machine, comprising the following steps:

[0048] 1) The conveying mechanism drives the label belt to move and convey the label to the lower end of the peeling and labeling mechanism;

[0049] 2) The heating mechanism heats the label conveyor belt from below, and cooperates with the heat-sensitive material of the heat-sensitive label belt to quickly complete the pre-separation of the label and the label belt;

[0050] 3) The airflow generating device provides negative pressure to the micro negative pressure port on the labeling plate to adsorb the pre-separated labels. In this process, since the negative pressure on the labeling plate gradually decreases from the center to the outside, a negative pressure gradient is formed. The adsorption force in the center area is stronger, and the adsorption force in the outer area is weaker. At the same time, the micro negative pressure port located on the outside of the labeling plate is inclined outward along the negative pressure direction, which can enable the labeling plate to generate a certain lateral pulling force on the label during the adsorption process, so that the middle label can reach the labeling plate first during the adsorption process and naturally fit under the action of the lateral pulling force.

[0051] The above-mentioned embodiments only express several implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that, for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A soft label peeling mechanism for a pneumatic labeling machine, characterized in that: The invention comprises a conveying mechanism (1) for conveying a label tape, a label pre-separation mechanism (2) and a peeling and labeling mechanism (3), wherein the label tape is a heat-sensitive label tape, the label pre-separation mechanism (2) comprises a heating mechanism (21) for heating the label tape to reduce the stickiness between the labels, and the peeling and labeling mechanism (3) comprises an airflow generating device (31), wherein the airflow generating device is connected to a labeling plate (32) capable of negative pressure adsorbing the label.

2. The soft label peeling mechanism for a pneumatic labeling machine according to claim 1, characterized in that: The labeling plate (32) is provided with a plurality of micro negative pressure ports (321), all of which are connected to an airflow generating device, and the micro negative pressure ports (321) located outside the labeling plate (32) are arranged obliquely outwards along the negative pressure direction.

3. A soft label peeling mechanism for a pneumatic labeling machine according to claim 1 or 2, characterized in that: The negative pressure formed within a unit area of ​​the labeling plate (32) gradually decreases from the center to the outside.

4. The soft label peeling mechanism for a pneumatic labeling machine according to claim 3, characterized in that: The number of micro negative pressure ports per unit area of ​​the labeling plate (32) gradually decreases from the center to the outside.

5. The soft label peeling mechanism for a pneumatic labeling machine according to claim 4, characterized in that: The aperture of the micro negative pressure port of the labeling plate (32) gradually increases from the center to the outside.

6. The soft label peeling mechanism for a pneumatic labeling machine according to claim 1, characterized in that: The heating mechanism (21) is an infrared heater or a microwave heater.

7. The soft label peeling mechanism for a pneumatic labeling machine according to claim 1, characterized in that: The label pre-separation mechanism (2) also includes a visual sensor mechanism for providing real-time feedback on the heating effect, detecting the bonding effect between the two, and performing real-time temperature control.

8. The soft label peeling mechanism for a pneumatic labeling machine according to claim 1, characterized in that: The conveying mechanism (1) comprises at least two conveying rollers (11) forming a horizontal conveying direction, the peeling and labeling mechanism is arranged at the upper end of the conveying position, and the heating mechanism is arranged at the lower end of the conveying position.

9. The soft label peeling mechanism for a pneumatic labeling machine according to claim 1, characterized in that: The thermal label tape is made of thermal PET or thermal BOPP.

10. A working method of the soft label peeling mechanism for a pneumatic labeling machine as claimed in any one of claims 1 to 9, characterized in that: The following steps are involved: 1) The conveying mechanism drives the label belt to move and convey the label to the lower end of the peeling and labeling mechanism; 2) The heating mechanism heats the label conveyor belt from below, and cooperates with the heat-sensitive material of the heat-sensitive label belt to quickly complete the pre-separation of the label and the label belt; 3) The airflow generating device provides negative pressure to the micro negative pressure port on the labeling plate to adsorb the pre-separated labels. In this process, since the negative pressure on the labeling plate gradually decreases from the center to the outside, a negative pressure gradient is formed. The adsorption force in the center area is stronger, and the adsorption force in the outer area is weaker. At the same time, the micro negative pressure port located on the outside of the labeling plate is inclined outward along the negative pressure direction, which can enable the labeling plate to generate a certain lateral pulling force on the label during the adsorption process, so that the middle label can reach the labeling plate first during the adsorption process and naturally fit under the action of the lateral pulling force.

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