Preparation method and production line of self-heating patch

Abstract

The invention relates to the technical field of production and processing of self-heating patches, in particular to a preparation method and a production line of a self-heating patch. The preparation method of the self-heating patch comprises the following steps: step 1, burdening: preparing a self-heating paste; step 2, coating and compounding, specifically, putting the self-heating paste in the step 1 between two layers of dust-free paper, and then rolling and forming to obtain a semi-finished product; thirdly, the semi-finished product obtained in the second step is cut into multiple pieces of semi-finished products according to the set size; fourthly, the multiple semi-finished products obtained in the third step are stacked in trays; 5, drying, specifically, the multiple trays in the step 4 are put into a drying oven, and drying is conducted in the oxygen-free atmosphere; and step 6, packaging each dried semi-finished product to obtain a finished product. The method has the advantages that the mixed heating material can be directly prepared into the required shape, the production link is shortened, the labor cost and the equipment cost are reduced, and the production efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of self-heating patch production and processing, and particularly relates to a preparation method and production line of a self-heating patch. BACKGROUND

[0002] Under the vigorous development of the health care and warming product market, the demand for self-heating patches continues to rise.

[0003] At present, the traditional self-heating patch production equipment has problems of low production efficiency, unstable product quality, high cost and the like.

[0004] In order to improve production efficiency, improve product quality, reduce cost and strengthen market competitiveness, it is urgent to provide an equipment capable of integrating coating and roll cutting processes and meeting the requirements of large-scale, high-precision and high-quality production. SUMMARY

[0005] The present application solves the technical problem of providing a preparation method and production line of a self-heating patch, which effectively overcomes the defects of the prior art.

[0006] The technical solution of the present application to solve the above technical problem is as follows:

[0007] A preparation method of a self-heating patch, comprising the following steps:

[0008] Step one, batching, configuring a self-heating paste;

[0009] Step two, coating and compounding, specifically: the self-heating paste of step one is put between two layers of dust-free paper, and then roll-formed to obtain a semi-finished product;

[0010] Step three, cutting the semi-finished product obtained in step two into multiple pieces according to the set size;

[0011] Step four, stacking the multiple pieces of semi-finished products obtained in step three in the trays respectively;

[0012] Step five, drying, specifically: the multiple trays of step four are placed in an oven and dried in an oxygen-free atmosphere;

[0013] Step six, packaging each semi-finished product after drying to obtain a finished product.

[0014] On the basis of the above technical solution, the present application can also be improved as follows.

[0015] Further, the raw materials of the self-heating paste include the following raw material components in percentage by mass:

[0016] 0.6-0.9% xanthan gum, 1-2.9% polyacrylamide, 1.2-1.6% wood pulp, 47.5-65.0% metal oxide powder, 32.0-47.5% carbon powder, and the balance water.

[0017] Further, in step one, the xanthan gum and polyacrylamide are added to the stirring kettle according to the ratio, water is added according to the ratio, heated at a temperature of 60-75°C for 30-35 min, then the wood pulp is added according to the ratio, and stirred for 25-35 min, then the carbon powder and metal oxide powder are added according to the ratio and stirred until uniform, to obtain the self-heating paste.

[0018] Further, in step five, the drying process is divided into three sections, the first section is preheated at 115-125°C for 5-6 min, the second section is constant temperature at 145-155°C for 10 min, and the third section is cooled at 25-35°C for 5-10 min, and the residual moisture is ensured to be ≤1%, to avoid cracking of the heating sheet.

[0019] The beneficial effect is that the rolling process does not require high temperature to maintain the flowability of the self-heating paste, and the energy consumption is reduced by % compared with the traditional blade coating.

[0020] Further, the production line comprises a first conveying device, a first roll unwinder, a second roll unwinder, a paste dispensing device, a first rolling shaft, a second rolling shaft, a second conveying device, an oven, a material transfer device, a third conveying device, a packaging machine, and a roll cutting shaft, the first roll unwinder is arranged at the feeding end of the first conveying device, the paste dispensing device is arranged above the feeding end of the first conveying device, the second roll unwinder is arranged above the first conveying device and downstream of the paste dispensing device, the first rolling shaft and the second rolling shaft are arranged above the first conveying device and cross the conveying surface of the first conveying device, the roll cutting shaft is arranged above the downstream conveying surface of the first conveying device, the second conveying device is arranged at the discharging end of the first conveying device, the second conveying device passes through the oven, the material transfer device is arranged between the discharging end of the second conveying device and the feeding end of the third conveying device, and the packaging machine is arranged at the discharging end of the third conveying device.

[0021] On the basis of the above technical solution, the application can also be improved as follows.

[0022] Further, the material transfer device is a mechanical hand, and the execution end of the mechanical hand is provided with a plurality of vacuum suction cups arranged in rows.

[0023] Further, the packaging machine is a four-side sealing packaging machine.

[0024] Further, a tail frame positioner is arranged above the feeding end of the third conveying device.

[0025] Furthermore, the first conveying device includes a front conveying device and a rear conveying device. A cutting pad is provided between the discharge end of the front conveying device and the feed end of the rear conveying device. The roller cutting shaft is arranged across the cutting pad. A waste winding machine is mounted above the rear conveying device.

[0026] The beneficial effects of this invention are: the mixed heating material can be directly prepared into the required shape, shortening the production process, reducing labor and equipment costs, and improving production efficiency. Attached Figure Description

[0027] Figure 1 This is a flowchart of the preparation method of the self-heating patch of the present invention;

[0028] Figure 2 A side view of a part of the production line of the present invention;

[0029] Figure 3 This is a top view of a part of the production line of the present invention.

[0030] The attached diagram lists the components represented by each number as follows:

[0031] 1. First conveying device; 2. First roll unwinder; 3. Second roll unwinder; 4. Paste feeding device; 5. First roller pressing shaft; 6. Second roller pressing shaft; 7. Second conveying device; 8. Drying oven; 9. Material transfer device; 10. Third conveying device; 11. Front conveying device; 12. Rear conveying device; 20. Packaging machine; 30. Roll cutting shaft; 40. Waste material rewinder. Detailed Implementation

[0032] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only for explaining the present invention and are not intended to limit the scope of the present invention.

[0033] Example 1

[0034] like Figure 1 As shown, the preparation method of the self-heating patch in this embodiment includes the following steps:

[0035] Step 1: Prepare the ingredients and mix the self-heating and self-heating paste.

[0036] Step 2, coating and lamination, specifically: the self-heating paste from Step 1 is placed between two layers of dust-free paper, and then rolled to form a semi-finished product;

[0037] Step 3: Cut the semi-finished product obtained in Step 2 into multiple semi-finished products according to the set size;

[0038] Step 4: Place the multiple semi-finished products obtained in Step 3 into a tray;

[0039] Step five, drying, specifically: placing the plurality of trays of step four into an oven, drying in an oxygen-free atmosphere;

[0040] Step six, packaging each piece of the dried semi-finished product to obtain the finished product.

[0041] In the preparation method of the embodiment, a relatively coherent process is adopted from the configuration of the self-heating paste to the final drying and packaging, which is relatively efficient. The rolling process reduces energy consumption by 20% compared to the traditional blade coating method, and can also greatly reduce labor intensity.

[0042] In the embodiment, the raw materials of the self-heating paste include the following raw material components by mass percentage:

[0043] 0.6-0.9% xanthan gum, 1-2.9% polyacrylamide, 1.2-1.6% wood pulp, 47.5-65.0% metal oxide powder, 32.0-47.5% carbon powder, and the balance water.

[0044] More specifically, in the embodiment, the xanthan gum and polyacrylamide are added to the stirring kettle according to the ratio, and water according to the ratio is added, heated at a temperature of 60-75°C for 30-35 min, then wood pulp is added according to the ratio, and stirred for 25-35 min, then carbon powder and metal oxide powder are added according to the ratio and stirred until uniform, to obtain the self-heating paste. The batching device uses a double-shaft stirring kettle with an internal paddle stirrer, with adjustable speed (30-500 r / s), equipped with a temperature control system (maintaining 50-200°C), to ensure that the self-heating raw materials (such as metal oxide powder, carbon powder, etc.) are uniformly mixed with additives such as xanthan gum and polyacrylamide into a paste, avoiding sedimentation. Pure mechanical batching has good discharge effect, high efficiency, and short cycle.

[0045] In the embodiment, the drying process is divided into three stages, the first stage is preheated at 115-125°C for 5-6 min, the second stage is constant temperature at 145-155°C for 10 min, and the third stage is cooled at 25-35°C for 5-10 min, and the residual moisture is ≤1%, to avoid cracking of the heating sheet. During the drying process, nitrogen (or other inert gas) is continuously input into the drying box under positive pressure to ensure that the entire drying process is carried out in an oxygen-free atmosphere to ensure that the heating patch will not be in contact with oxygen and become ineffective.

[0046] Example 2

[0047] As Figure 2 and 3As shown, the production line of the self-heating patch of the embodiment includes a first conveying device 1, a first roll material unwinder 2, a second roll material unwinder 3, a paste discharging device 4, a first roller shaft 5, a second roller shaft 6, a second conveying device 7, an oven 8, a material transfer device 9, a third conveying device 10, a packaging machine 20 and a roller cutting shaft 30. The first roll material unwinder 2 is arranged at the feeding end of the first conveying device 1. The paste discharging device 4 is arranged above the feeding end of the first conveying device 1. The second roll material unwinder 3 is arranged above the first conveying device 1 and downstream of the paste discharging device 4. The first roller shaft 5 and the second roller shaft 6 are arranged above the first conveying device 1 and across the conveying surface of the first conveying device 1. The roller cutting shaft 30 is arranged above the conveying surface of the first conveying device 1 downstream. The second conveying device 7 is arranged at the discharging end of the first conveying device 1. The second conveying device 7 passes through the oven 8. The material transfer device 9 is arranged between the discharging end of the second conveying device 7 and the feeding end of the third conveying device 10. The packaging machine 20 is arranged at the discharging end of the third conveying device 10.

[0048] In the embodiment, the first roll material unwinder 2 conveys the bottom layer of roll material (non-woven fabric or dust-free paper) on the surface of the first conveying device 1. The paste discharging device 4 discharges the self-heating paste on the bottom layer of roll material at the feeding end (conveying surface) of the first conveying device 1. Before entering the first roller shaft 5, the second roll material unwinder 3 unwinds the upper layer of roll material to cover the self-heating paste, and then enters the first roller shaft 5 between the conveying surface of the first conveying device 1 for the first time. After that, the second roller shaft 6 and the conveying surface of the first conveying device 1 are entered for the second time. During the rolling process of the self-heating paste, the three layers of the bottom layer of roll material, the self-heating paste and the upper layer of roll material are synchronously compounded to form a three-layer structure, thereby avoiding the adhesion of the self-heating paste to the equipment. Next, the three-layer structure passes under the roller cutting shaft 30 and is cut into multiple square sheets by the roller cutting shaft 30, and then falls on the tray prepared in advance on the second conveying device 7. Then, the three-layer structure is conveyed into the subsequent oven 8 by the second conveying device 7, dried, transferred to the feeding end of the third conveying device 10 by the material transfer device 9 at the discharging end of the second conveying device 7, and then conveyed to the packaging machine 20 by the third conveying device 10 for packaging. The cooperation between the various structural devices is close, and a relatively coherent assembly line processing can be formed, thereby improving the processing efficiency.

[0049] It needs to be specially pointed out that: the first roller shaft 5 and the second roller shaft 6 span above the conveying surface of the first conveying device 1, the height of the two is adjusted, the two ends are respectively rotatably assembled with the corresponding frame body, and one end of the two can be configured with a power device (such as a motor) to drive the two to rotate. The roll cutting shaft 30 is a product of the prior art (including a roller, a plurality of annular first cutting knives are arranged on the surface of the roller along the axial direction, and a plurality of second cutting knives extending along the axial direction are arranged between adjacent first cutting knives), the main purpose is to cut the conveyed sheet material into a row of small pieces of the same size, and the two ends are also rotatably assembled with the corresponding frame body, and the end portion can be configured with a power device (such as a motor) to drive it to rotate. In this embodiment, the paste discharging device 4 can adopt the patent with the publication number CN221092851U: a conveying device suitable for self-heating paste material discharging, and a plurality of conveying devices can be arranged to span the surface of the first conveying device 1.

[0050] In this embodiment, the initial distance between the first roller shaft 5 and the second roller shaft 6 is 0.2-0.5m, and the linear speed is 5-15m / min; of course, when more precise processing is required, the distance between the rollers can be adjusted to 0.8-1.2mm, and a temperature control system (the roller shaft is provided with a heating unit, which can adjust the roller surface temperature to 60-80℃, which belongs to the prior art and will not be described here) is used to ensure that the thickness tolerance of the heating sheet is ≤±0.1mm.

[0051] In this embodiment, the first roll unwinder 2 and the second roll unwinder 3 are matched with the first roller shaft 5 and the second roller shaft 6 through the self-provided tension control system (which belongs to the conventional structural design of the roll unwinder, and the patent with the publication number CN202848714U: a roll constant tension unwinding device of a film laminating machine can be used, and the tension is 5-10N) to synchronize the compounding during the self-heating paste roller pressing process, and form a three-layer structure of “bottom layer roll-paste-self-heating paste-upper layer roll”.

[0052] Preferably, the above-mentioned material transfer device 9 is a manipulator (multi-axis manipulator), and the execution end of the above-mentioned manipulator is provided with a plurality of vacuum suction cups arranged in rows. The vacuum suction cups are driven by the manipulator to move reciprocally between above the discharge end of the second conveying device 7 and above the feeding end of the third conveying device 10, so as to transfer the dried multiple sheet materials to the third conveying device 10, so as to smoothly enter the packaging link. The vacuum suction cup is used to facilitate the taking and placing of the cut and dried sheet materials.

[0053] In this embodiment, the above-mentioned packaging machine 20 adopts the existing adaptive type four-side sealing packaging machine in the industry. The four-side sealing packaging machine adopts a conventional heat sealing process, the breathable film heat sealing temperature is 180-200℃, and the sealing edge width is 3-5mm, so as to ensure the sealing property.

[0054] In the embodiment, a tailstock positioner is arranged on the upper part of the feeding end of the third conveying device 10. The tailstock positioner is a commonly used device on the conveying belt (also called a tailstock device), which is equipped with a servo motor positioning system with an accuracy of ±0.5 mm. The tailstock positioner cooperates with the vacuum suction cup of the manipulator to neatly arrange the dried heat-generating sheet on the third conveying device 10 and neatly enter the packaging station of the subsequent packaging machine 20. The tailstock positioner mainly comprises a plurality of separation strips arranged on the upper surface of the discharge end of the third conveying device 10 in the conveying direction of the third conveying device 10, so that the cut sheet material can orderly advance in the plurality of channels isolated between the plurality of separation strips, and the sheet material is prevented from being skewed along the width direction of the conveying belt.

[0055] As a preferred embodiment, the first conveying device 1 comprises a front section conveying device 11 and a rear section conveying device 12, a cutting pad 13 is arranged between the discharge end of the front section conveying device 11 and the feeding end of the rear section conveying device 12, the roll cutting shaft 30 is arranged above the cutting pad 13, and the waste rolling machine 40 is arranged above the rear section conveying device 12.

[0056] In the embodiment, the first conveying device 1 is a two-section conveying device, the cutting pad 13 is arranged between the front section conveying device 11 and the rear section conveying device 12, and the cutting pad 13 is mainly used to cut the “bottom layer of coiled material-self-heating paste-top layer of coiled material” three-layer structure in cooperation with the roll cutting shaft 30 to ensure effective cutting. The waste rolling machine 40 is mainly used to roll and recycle the two strip-shaped excess materials at both ends of the roll cutting shaft 30. The structure of the waste rolling machine 40 is consistent with the existing rolling machine, and an existing adaptive model of rolling machine can be used.

[0057] In the embodiment, the front section conveying device 11 and the rear section conveying device 12, the second conveying device 7 and the third conveying device 10 all adopt an adaptive model of belt conveyor.

[0058] In the description of the present application, it should be understood that the orientations or positional relationships indicated by the terms “center”, “longitudinal”, “transverse”, “length”, “width”, “thickness”, “upper”, “lower”, “front”, “rear”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inner”, “outer”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential” are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0059] In addition, the terms "first", "second", etc. are used only for the purpose of description and do not imply or imply relative importance or imply the number of the technical features indicated. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, such as two, three, etc., unless otherwise explicitly specified.

[0060] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0061] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact between the first and second features through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be directly above or obliquely above the first feature, or only indicate that the first feature is higher than the second feature in horizontal height. The first feature "below", "below" and "below" the second feature can be directly below or obliquely below the first feature, or only indicate that the first feature is lower than the second feature in horizontal height.

[0062] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms is not necessarily for the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any suitable manner in any one or more embodiments or examples. In addition, those skilled in the art can combine and combine different embodiments or features of different embodiments or examples described in the present application without contradiction.

[0063] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above embodiments within the scope of the present application.

Claims

1. A method for preparing a self-heating patch, characterized in that, It comprises the following steps: Step one, ingredients, configure the self-heating paste; Step two, coating compound, specifically: the self-heating paste of step one is put between two layers of dust-free paper, and then rolled into a semi-finished product; Step three, cut the semi-finished product obtained in step two into multiple pieces according to the set size; Step four, the multiple pieces of semi-finished product obtained in step three are respectively placed in the tray; Step five, drying, specifically: the multiple trays of step four are put into an oven and dried in an oxygen-free atmosphere; Step six, each piece of semi-finished product after drying is packaged to obtain a finished product.

2. The method for preparing a self-heating patch according to claim 1, characterized in that, The raw materials of the self-heating paste include the following raw material components by mass percentage: 0.6-0.9% xanthan gum, 1-2.9% polyacrylamide, 1.2-1.6% wood pulp, 47.5-65.0% metal oxide powder, 32.0-47.5% carbon powder, and the balance water.

3. The method for preparing a self-heating patch according to claim 2, characterized in that: In step one, the xanthan gum and polyacrylamide are added to the stirring kettle according to the ratio, water is added according to the ratio, heated at a temperature of 60-75℃ for 30-35min, then the wood pulp is added according to the ratio, and stirred for 25-35min, then the carbon powder and metal oxide powder are added according to the ratio and stirred until uniform to obtain the self-heating paste.

4. The method for preparing a self-heating patch according to claim 3, characterized in that: In step five, the drying process is divided into three stages, the first stage is preheated at 115-125℃ for 5-6min, the second stage is constant temperature at 145-155℃ for 10min, and the third stage is cooled at 25-35℃ for 5-10min, and the water residue is ensured to be ≤1% to avoid the heating sheet cracking.

5. A production line for carrying out the method for producing a self- heating patch according to any one of claims 1 to 4, characterized in that: It comprises a first conveying device (1), a first coiled material unwinding machine (2), a second coiled material unwinding machine (3), a paste discharging device (4), a first roller pressing shaft (5), a second roller pressing shaft (6), a second conveying device (7), an oven (8), a material transfer device (9), a third conveying device (10), a packaging machine (20) and a roller cutting shaft (30). The first coiled material unwinding machine (2) is arranged at the feeding end of the first conveying device (1). The paste discharging device (4) is arranged above the feeding end of the first conveying device (1). The second coiled material unwinding machine (3) is arranged above the first conveying device (1) and downstream of the paste discharging device (4). The first roller pressing shaft (5) and the second roller pressing shaft (6) are arranged above the first conveying device (1) and cross the conveying surface of the first conveying device (1). The roller cutting shaft (30) is arranged above the conveying surface downstream of the first conveying device (1). The second conveying device (7) is arranged at the discharging end of the first conveying device (1). The second conveying device (7) passes through the oven (8). The material transfer device (9) is arranged between the discharging end of the second conveying device (7) and the feeding end of the third conveying device (10). The packaging machine (20) is arranged at the discharging end of the third conveying device (10).

6. A production line according to claim 5, characterized in that: The material transfer device (9) is a mechanical hand, and the execution end of the mechanical hand is provided with a plurality of row-column distributed vacuum suction cups.

7. A production line according to claim 5, characterized in that: The packaging machine (20) is a four-side sealing packaging machine.

8. A production line according to claim 5, characterized in that: The third conveying device (10) is provided with a tailstock positioner on the upper part of the feeding end.

9. A production line according to any one of claims 5 to 8, characterised in that: The first conveying device (1) comprises a front section conveying device (11) and a rear section conveying device (12), and a cutting pad seat (13) is arranged between the discharging end of the front section conveying device (11) and the feeding end of the rear section conveying device (12), and the roll cutting shaft (30) is arranged above the cutting pad seat (13), and the upper part of the rear section conveying device (12) is provided with a waste winding machine (40).

10. A production line according to claim 9, characterized in that: The front section conveying device (11) and the rear section conveying device (12), the second conveying device (7) and the third conveying device (10) are all belt conveyors.

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