An automatic adhesive packaging machine for starch film

Abstract

This disclosure relates to the technical field of heat-bonding for starch films. One embodiment of this disclosure provides an automatic bonding and packaging machine for starch films, comprising: a fixed plate and a forming tube, the forming tube being fixed to the side surface of the fixed plate, a folding assembly disposed between the forming tube and the fixed plate, a connecting plate being fixed to the side surface of the fixed plate, and a heat-pressing assembly disposed on the connecting plate. The heat-pressing assembly includes a rotating shaft rotatably connected to the side surface of the connecting plate, the rotating shaft being electrically driven to rotate, a heat-pressing wheel being disposed at one end of the rotating shaft, and a pair of fixing rods being fixedly connected to the side surface of the connecting plate, with a heat-conducting cover disposed at one end of each fixing rod, and a plurality of heating tubes installed inside the heat-conducting cover. This technical solution solves the technical problem in the prior art where the heat-bonding device of existing automatic packaging machines mostly uses an integrated heating module, where heat is conducted to the film contact surface through metal, and temperature deviations easily occur in the heat-bonding area due to factors such as uneven film thickness and fluctuations in conveying tension.

Description

Technical Field

[0001] The embodiments disclosed herein relate to the technical field of heat bonding for starch films, and more specifically, to an automatic bonding and packaging machine for starch films. Background Technology

[0002] In green packaging applications in the food and pharmaceutical industries, starch film, as a biodegradable and environmentally friendly material, is widely used due to its excellent biocompatibility. However, in current automated packaging processes using heat-sealing molding, uneven heating is a common problem, leading to gaps in the packaging and severely affecting its sealing performance and product shelf life. Starch film, made from modified plant starch, is significantly more heat-sensitive than traditional plastic film. Within the heat-sealing temperature range of 60-120℃, temperature fluctuations exceeding ±5℃ can lead to localized overheating and carbonization of the film or insufficient adhesion. Existing automatic packaging machines often use integrated heating modules for heat sealing, where heat is conducted to the film contact surface via metal. Due to factors such as uneven film thickness and fluctuations in conveyor tension, temperature deviations are prone to occur in the heat-sealing area. For starch films with a thickness of 0.05-0.15mm, these deviations can result in micro-gaps in the packaged goods, and the probability of seal failure is even higher in humid environments. Furthermore, gaps can lead to quality risks such as leakage of contents and deterioration due to moisture, forcing companies to increase manual re-inspection and reducing production efficiency by 20%-30%. In small-batch, multi-specification packaging demands, the heating parameters of traditional equipment are complex to adjust, requiring repeated testing during model changes, further exacerbating the instability of heat-sealing quality. Therefore, developing an automatic starch film bonding and packaging machine that can achieve uniform heating and reduce heat-sealing gaps has become a key requirement for promoting the industrial application of environmentally friendly packaging materials. Utility Model Content

[0003] To overcome the above-mentioned defects, the embodiments of this disclosure provide an automatic adhesive packaging machine for starch film, which solves the technical problem that the heat-sealing device of existing automatic packaging machines mostly adopts an integral heating module, and the heat is conducted to the film contact surface through metal. Affected by factors such as uneven film thickness and fluctuation of conveying tension, temperature deviations are prone to occur in the heat-sealing area.

[0004] According to one aspect, at least one embodiment of the present disclosure provides an automatic adhesive packaging machine for starch films, comprising: A fixing plate and a forming tube, wherein the forming tube is fixed to the side surface of the fixing plate; A folding assembly is disposed between the forming tube and the fixing plate; A connecting plate and a hot pressing assembly, wherein the connecting plate is fixed to the side surface of the fixed plate, and the hot pressing assembly is disposed on the connecting plate; The hot pressing assembly includes a rotating shaft, which is rotatably connected to the side surface of the connecting plate. The rotating shaft is driven to rotate by electricity. A hot pressing wheel is provided at one end of the rotating shaft. A pair of fixing rods are fixedly connected to the side surface of the connecting plate. A heat-conducting cover is provided at one end of the fixing rods. Several heating tubes are installed inside the heat-conducting cover.

[0005] As a further technical solution, the heat-conducting cover is slidably attached to the surface of the hot press roller, the surface of the forming tube is provided with an opening, and both ends of the forming tube are provided with inner frames. A support wheel is rotatably connected between the inner frames, and the support wheel is attached to the bottom of the hot press roller.

[0006] As a further technical solution, the folding assembly includes a pair of long rods, the long rods are fixed to the side surface of the fixing plate, one end of the long rods is fixedly connected to a folding sleeve, and the surface of the forming tube is provided with a rocker plate.

[0007] As a further technical solution, a pair of extension plates are provided at one end of the forming tube, and a shrink sleeve is fixedly connected to one end of the extension plate. The forming tube has an L-shaped bending structure as a whole, and a feed port is opened on the surface of the bending part of the forming tube.

[0008] As a further technical solution, a pair of auxiliary rods are provided on the surface of the fixing plate. The auxiliary rods are located on both sides of the forming tube, and a flattening wheel is provided between one end of the auxiliary rods. The flattening wheel is attached to the surface of the bending part of the forming tube.

[0009] As a further technical solution, the folding sleeve has an overall C-shaped structure.

[0010] As a further technical solution, the hot pressing roller (4-2) and the support roller (4-8) are closely fitted together, and the contact position between the hot pressing roller (4-2) and the support roller (4-8) is on the same horizontal plane as the surface of the forming tube (2).

[0011] As a further technical solution, a number of fixing holes (6) are provided on one side of the surface of the fixing plate (1).

[0012] As a further technical solution, a large gap is left between the bottom of the support wheel (4-8) and the inner wall of the forming tube (2).

[0013] As a further technical solution, the feed inlet (5-6) is located in the upper half of the bent portion of the forming tube (2).

[0014] The beneficial effects of the embodiments disclosed herein are as follows: In this disclosure, the hot-pressing assembly solves the problem of temperature deviation in traditional hot-pressing by employing a uniform heating design. The heat-conducting cover slides and adheres to the hot-pressing roller, ensuring uniform heat transfer; the heating tubes are evenly distributed, maintaining a stable temperature on the hot-pressing roller; and the support roller, in conjunction with the hot-pressing roller, forms a clamping mechanism, ensuring constant pressure. This structure avoids localized overheating or insufficient adhesion of the starch film, reduces hot-pressing gaps, improves packaging sealing, adapts to the heat-sensitive characteristics of starch film, guarantees product shelf life, and reduces the cost of manual re-inspection. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments of this disclosure will be briefly introduced below. Obviously, the drawings described below are merely some exemplary embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on the content of the exemplary embodiments of this disclosure and these drawings without any creative effort.

[0016] Figure 1 This is a schematic diagram of a structure in one embodiment of the present disclosure; Figure 2 This is an isometric drawing of the present disclosure; Figure 3 This is an isometric sectional view of the present disclosure; In the diagram: 1. Fixing plate; 2. Forming tube; 3. Connecting plate; 4. Hot pressing assembly; 4-1. Rotating shaft; 4-2. Hot pressing wheel; 4-3. Fixing rod; 4-4. Heat conducting cover; 4-5. Heating tube; 4-6. Through port; 4-7. Inner frame; 4-8. Support wheel; 5. Folding assembly; 5-1. Long rod; 5-2. Folding sleeve; 5-3. Rocker; 5-4. Extension plate; 5-5. Shrink sleeve; 5-6. Feed port; 5-7. Secondary rod; 5-8. Flattening wheel; 6. Fixing hole. Detailed Implementation

[0017] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present disclosure and are not intended to limit the scope of the disclosure.

[0018] To keep the drawings concise, each drawing only schematically shows the parts relevant to the disclosure; these do not represent the actual structure of the product. Furthermore, for ease of understanding, in some drawings, only one of components with the same structure or function is schematically shown, or only one is labeled. In this document, "one" not only means "only one," but can also mean "more than one," and "several" includes "two" and "more than two."

[0019] In this document, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this disclosure based on the specific circumstances.

[0020] In this disclosure, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0021] In the description of this embodiment, terms such as "upper," "lower," "left," and "right" are based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of description and simplification of operation, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this disclosure.

[0022] Furthermore, in the description of this application, the terms "first," "second," etc., are used only to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0023] like Figures 1-3 As shown, it illustrates an automatic adhesive packaging machine for starch film according to an embodiment of the present disclosure, comprising: A fixing plate 1 and a forming tube 2, wherein the forming tube 2 is fixed to the side surface of the fixing plate 1; Folding component 5, wherein the folding component 5 is disposed between the forming tube 2 and the fixing plate 1; The connecting plate 3 and the hot pressing assembly 4 are provided on the connecting plate 3. The connecting plate 3 is fixed to the side surface of the fixed plate 1, and the hot pressing assembly 4 is disposed on the connecting plate 3. The hot pressing assembly 4 includes a rotating shaft 4-1, which is rotatably connected to the side surface of the connecting plate 3. The rotating shaft 4-1 is driven to rotate by electricity. A hot pressing wheel 4-2 is provided at one end of the rotating shaft 4-1. A pair of fixing rods 4-3 are fixedly connected to the side surface of the connecting plate 3. A heat-conducting cover 4-4 is provided at one end of the fixing rods 4-3. Several heating tubes 4-5 are installed inside the heat-conducting cover 4-4. The heat-conducting cover 4-4 is slidably attached to the surface of the hot pressing wheel 4-2. An opening 4-6 is provided on the surface of the forming tube 2. Inner frames 4-7 are provided at both ends of the forming tube 2. A support wheel 4-8 is rotatably connected between the inner frames 4-7. The support wheel 4-8 is attached to the bottom of the hot pressing wheel 4-2.

[0024] In some examples, a hot-pressing assembly 4 is designed to achieve stable hot-pressing and bonding of the starch film. This assembly includes a rotating shaft 4-1 within the side surface of the connecting plate 3, rotatably connected by bearings and driven by a motor. A hot-pressing roller 4-2 at one end rotates synchronously with the shaft, its surface contacting the starch film and applying pressure. A pair of fixed rods 4-3 are symmetrically distributed on the side surface of the connecting plate 3. A heat-conducting cover 4-4 at one end is a hollow structure with several heating tubes 4-5 evenly arranged inside. When energized, these tubes generate heat and conduct it to the surface of the heat-conducting cover 4-4. The heat-conducting cover 4-4 slides against the surface of the hot-pressing roller 4-2, continuously transferring heat to the roller and maintaining its operating temperature. Inner frames 4-7 at both ends of the forming tube 2 support the rotation of support wheels 4-8, which are attached to the bottom of the hot-pressing roller 4-2, forming a clamping structure.

[0025] During operation, heating tubes 4-5 heat the heat-conducting cover 4-4, transferring heat to the hot-pressing roller 4-2 to raise its temperature. The rotating shaft 4-1 drives the hot-pressing roller 4-2 to rotate, and the starch film passes between the hot-pressing roller 4-2 and the support roller 4-8. Under high temperature and pressure, the contact surface melts and bonds. The continuous rotation of the hot-pressing roller 4-2 achieves continuous hot pressing, ensuring strong adhesion and consistent forming. The sliding contact between the heat-conducting cover 4-4 and the hot-pressing roller 4-2 ensures uniform heating and avoids localized overheating that could damage the starch film. The supporting role of the support roller 4-8 stabilizes the hot-pressing pressure, improving bonding quality. The uniform distribution of heating tubes 4-5 ensures a constant temperature for the heat-conducting cover 4-4, guaranteeing consistent hot-pressing results. The drive of the rotating shaft 4-1 makes the hot-pressing process continuous, adapting to the needs of automated packaging. This component, through a stable hot-pressing and transmission design, achieves reliable forming and bonding of starch film packaging bags.

[0026] like Figures 1-3As shown in the figure, the folding component 5 in this embodiment includes a pair of long rods 5-1, which are fixed to the side surface of the fixing plate 1. A folding sleeve 5-2 is fixedly connected to one end of the long rods 5-1. A rocker plate 5-3 is provided on the surface of the forming tube 2. A pair of extension plates 5-4 are provided at one end of the forming tube 2. A shrink sleeve 5-5 is fixedly connected to one end of the extension plate 5-4. The forming tube 2 has an L-shaped bending structure. A feed port 5-6 is opened on the surface of the bending part of the forming tube 2. A pair of auxiliary rods 5-7 are provided on the surface of the fixing plate 1. The auxiliary rods 5-7 are located on both sides of the forming tube 2. A flattening wheel 5-8 is provided between one end of the auxiliary rods 5-7. The flattening wheel 5-8 is attached to the surface of the bending part of the forming tube 2.

[0027] In some examples, a folding assembly 5 is designed to fold the flat starch film into a bag shape to assist in subsequent hot pressing. This assembly includes a pair of parallel long rods 5-1 on the side surface of the fixing plate 1, and a folding sleeve 5-2 at one end that is semi-tubular with a smooth inner side, which guides the edge of the flat starch film to bend inward to form a preliminary folded shape. The forming tube 2 has an L-shaped bending structure, and the tilting plate 5-3 on its surface is inclined to tilt one side of the starch film upward, making it easier to enter the folding sleeve 5-2. A pair of extension plates 5-4 at one end support the shrinking sleeve 5-5, which gradually narrows in diameter, further tightening the initially folded starch film so that the edge is aligned with the feed inlet 5-6 at the bend of the forming tube 2 to receive the folded starch film. A pair of auxiliary rods 5-7 on the surface of the fixing plate 1 are located on both sides of the forming tube 2, and a flattening wheel 5-8 at one end is attached to the surface of the bend of the forming tube 2 to apply pressure to the passing folded starch film and keep it in the folded shape. During operation, the flat starch film is guided by the rocker arm 5-3 into the folding sleeve 5-2, where its edges are folded inward to form a fold. It then passes through the shrink sleeve 5-5 to tighten and align, and is conveyed along the L-shaped forming tube 2. At the fold, it is flattened and shaped by the flattening roller 5-8, maintaining its folded state before entering the hot-pressing assembly 4. The cooperation between the folding sleeve 5-2 and the shrink sleeve 5-5 achieves a gradual shaping of the starch film from flat to folded, ensuring edge alignment. The guiding effect of the L-shaped forming tube 2 changes the conveying direction of the starch film, adapting to the layout of the packaging machine. The pre-pressing and shaping by the flattening roller 5-8 prevents the folded starch film from springing back, ensuring the accuracy of subsequent hot pressing. The guiding design of the rocker arm 5-3 allows the starch film to smoothly enter the folding structure, reducing jamming. This assembly, through multi-step folding and shaping, provides a regular basic shape for the formation of the starch film packaging bag, and works in conjunction with the hot-pressing assembly 4 to complete the packaging bag production.

[0028] For example, such as Figure 2 As shown, the folding sleeve 5-2 has an overall C-shaped structure.

[0029] In some examples, the folding sleeve 5-2 has a C-shaped structure, with its inner curvature adapting to the bending requirements of the starch film. This structure guides and limits the starch film from both sides and the bottom, allowing the edges of the flat starch film to bend precisely inward, forming a neat fold. The C-shaped opening facilitates the entry of the starch film while preventing wrinkles or misalignment during bending, laying the foundation for the subsequent tightening and alignment of the shrink sleeve 5-5 and improving folding accuracy.

[0030] For example, such as Figure 3 As shown, the hot pressing roller 4-2 and the support roller 4-8 are closely fitted together, and the contact position between the hot pressing roller 4-2 and the support roller 4-8 is on the same horizontal plane as the surface of the forming tube 2.

[0031] In some examples, the hot press roller 4-2 applies uniform pressure to the surface of the formed tube, ensuring stable stress on the tube during hot pressing and preventing dents or deformation. The use of a single horizontal plane ensures precise hot pressing positioning, ensuring the processed areas of the starch film meet specifications and improving product forming quality.

[0032] For example, such as Figure 2 As shown, a plurality of fixing holes 6 are provided on one side of the surface of the fixing plate 1.

[0033] In some examples, several fixing holes 6 are evenly distributed on one side of the surface of the fixing plate 1, which can be used to securely install the fixing plate 1 onto the frame with bolts. The setting of fixing holes 6 facilitates the adjustment of the installation position of the fixing plate 1 according to actual operation requirements, ensuring precise docking of components such as the forming tube 2 and the folding assembly 5 with other equipment, enhancing the stability and flexibility of the device installation, and ensuring the overall coordination of the packaging machine operation.

[0034] For example, such as Figure 2 As shown, there is a large gap between the bottom of the support wheel 4-8 and the inner wall of the forming tube 2.

[0035] In some examples, the slight deformation of the forming tube 2 during processing provides space, preventing damage caused by friction between the support wheels 4-8 and the inner wall of the forming tube 2. At the same time, the larger gap facilitates airflow and material passage within the forming tube 2, without affecting the normal operation of the equipment and ensuring smooth processing.

[0036] For example, such as Figure 2 As shown, the feed inlet 5-6 is located in the upper half of the bent portion of the forming tube 2.

[0037] In some examples, this positioning design facilitates the smooth entry of materials into the forming tube 2 under gravity, especially reducing powder retention at bends. The upper section also facilitates docking with the feeding device, making the powder conveying path more rational, improving feeding efficiency, and ensuring continuous processing.

[0038] In actual use: The flat starch film is guided by the rocker arm 5-3 into the C-shaped folding sleeve 5-2, where the edges are bent inward to form a preliminary fold. It is then tightened and aligned by the shrink sleeve 5-5 and conveyed along the L-shaped forming tube 2. The flattening roller 5-8 at the bend flattens and shapes the film to prevent springback. In the hot pressing assembly 4, the heating tube 4-5 heats the heat-conducting cover 4-4, and the heat is transferred to the hot pressing roller 4-2. The rotating shaft 4-1 drives the hot pressing roller 4-2 to rotate, which, in conjunction with the bottom support roller 4-8, clamps the starch film. The high temperature and pressure melt and bond the contact surfaces of the film, and continuous hot pressing forms a sealed package. The entire process achieves automatic folding and uniform heat bonding of the starch film, ensuring the airtightness of the packaging.

[0039] It should be noted that the above embodiments are only used to illustrate the technical solutions of this disclosure and are not intended to limit it. Although this disclosure has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this disclosure without departing from the spirit and scope of the technical solutions of this disclosure, and all such modifications and substitutions should be covered within the scope of the claims of this disclosure.

Claims

1. An automatic adhesive packaging machine for starch film, characterized in that, include: A fixing plate (1) and a forming tube (2), wherein the forming tube (2) is fixed to the side surface of the fixing plate (1); A folding assembly (5) is disposed between the forming tube (2) and the fixing plate (1); The connecting plate (3) and the hot pressing assembly (4) are provided on the connecting plate (3), the connecting plate (3) is fixed on the side surface of the fixed plate (1), and the hot pressing assembly (4) is provided on the connecting plate (3). The hot pressing assembly (4) includes a rotating shaft (4-1), which is rotatably connected to the side surface of the connecting plate (3). The rotating shaft (4-1) is driven to rotate by electricity. A hot pressing wheel (4-2) is provided at one end of the rotating shaft (4-1). A pair of fixing rods (4-3) are fixedly connected to the side surface of the connecting plate (3). A heat-conducting cover (4-4) is provided at one end of the fixing rods (4-3). Several heating tubes (4-5) are installed inside the heat-conducting cover (4-4).

2. The automatic adhesive packaging machine for starch film according to claim 1, characterized in that, The heat-conducting cover (4-4) is slidably attached to the surface of the hot press roller (4-2). The surface of the forming tube (2) is provided with an opening (4-6). Both ends of the forming tube (2) are provided with inner frames (4-7). A support wheel (4-8) is rotatably connected between the inner frames (4-7). The support wheel (4-8) is attached to the bottom of the hot press roller (4-2).

3. The automatic adhesive packaging machine for starch film according to claim 1, characterized in that, The folding assembly (5) includes a pair of long rods (5-1), which are fixed to the side surface of the fixing plate (1). A folding sleeve (5-2) is fixedly connected to one end of the long rod (5-1), and a rocker plate (5-3) is provided on the surface of the forming tube (2).

4. An automatic adhesive packaging machine for starch film according to claim 3, characterized in that, The forming tube (2) is provided with a pair of extension plates (5-4) at one end, and a shrink sleeve (5-5) is fixedly connected to one end of the extension plate (5-4). The forming tube (2) has an L-shaped bending structure as a whole, and a feed port (5-6) is opened on the surface of the bending part of the forming tube (2).

5. An automatic adhesive packaging machine for starch film according to claim 4, characterized in that, The surface of the fixing plate (1) is provided with a pair of auxiliary rods (5-7), the auxiliary rods (5-7) are located on both sides of the forming tube (2), and a flattening wheel (5-8) is provided between one end of the auxiliary rods (5-7), the flattening wheel (5-8) is attached to the surface of the bending part of the forming tube (2).

6. An automatic adhesive packaging machine for starch film according to claim 3, characterized in that, The folding sleeve (5-2) has an overall C-shaped structure.

7. An automatic adhesive packaging machine for starch film according to claim 2, characterized in that, The hot pressing roller (4-2) and the support roller (4-8) are closely fitted together, and the contact position between the hot pressing roller (4-2) and the support roller (4-8) is on the same horizontal plane as the surface of the forming tube (2).

8. An automatic adhesive packaging machine for starch film according to claim 1, characterized in that, The fixing plate (1) has several fixing holes (6) on one side of its surface.

9. An automatic adhesive packaging machine for starch film according to claim 2, characterized in that, There is a large gap between the bottom of the support wheel (4-8) and the inner wall of the forming tube (2).

10. An automatic adhesive packaging machine for starch film according to claim 4, characterized in that, The feed inlet (5-6) is located in the upper half of the bent portion of the forming tube (2).

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