A heat-pressing device for kraft paper and film lamination

Abstract

The utility model relates to kraft paper processing technical field especially relates to a kraft paper film clamping composite hot press device, including frame, preheating box, cooling box and hot press mechanism, preheating box and cooling box are fixedly installed in the upper end of frame, and hot press mechanism is located between preheating box and cooling box, and the side wall surface of preheating box is inlayed with the flow distributor, and the side of flow distributor is connected with the conveying air pipe through, and the inside integration of conveying air pipe has the array arrangement of multiple sets of electric heating pipe, and one end of conveying air pipe is provided with the air draught fan, and the side wall of preheating box and cooling box is all seted up with the notch, and the inside notch of preheating box and cooling box is all rotatably connected with the godet, the utility model utilizes conveying air pipe and flow distributor to carry out even air supply to preheating box inside through the air draught fan, and the hot air circulation is formed after the airflow is heated through electric heating pipe array, and the kraft paper material that passes through preheating box is implemented effective preheating, and provides suitable initial temperature condition for subsequent hot press mechanism operation.

Description

Technical Field

[0001] This utility model relates to the field of kraft paper processing technology, and in particular to a hot pressing device for kraft paper laminated with film. Background Technology

[0002] In the field of packaging materials, it is often necessary to laminate two layers of kraft paper with a layer of functional film, such as water-blocking and gas-blocking plastic film, through hot pressing to produce high-performance laminated paper. Kraft paper laminated composite materials are widely used in various industrial packaging and premium bag production due to their excellent strength, barrier properties and environmental friendliness.

[0003] Existing hot pressing devices typically rely on high-power electric heating rollers to instantly heat and press the material. However, due to its physical properties, kraft paper rolls may carry certain internal stress during unwinding. If they are directly placed into the high-temperature pressing zone, wrinkles and bubbles are easily generated, affecting the composite quality.

[0004] Therefore, to address the above problems, a hot pressing device for kraft paper laminated composite can be designed, equipped with a preheating device to achieve progressive heating treatment of the kraft paper substrate, thereby reducing the probability of composite defects from the source and effectively improving the quality stability of the composite material. Utility Model Content

[0005] In order to overcome the problem that traditional hot pressing devices usually rely on high-power electric heating rollers to heat and press materials instantly, kraft paper rolls may have certain internal stress during unwinding due to their physical properties. If they are directly put into the high-temperature pressing zone, wrinkles and bubbles are very likely to be generated, which will affect the quality of the composite.

[0006] The technical solution of this utility model is as follows: a hot pressing device for kraft paper laminated composite, including a frame, a preheating box, a cooling box, a hot pressing mechanism, and two sets of adjustment mechanisms. The preheating box and the cooling box are both fixedly installed on the upper end of the frame. The hot pressing mechanism is located between the preheating box and the cooling box. The two sets of adjustment mechanisms are respectively set at the discharge end of the cooling box and the feed end of the preheating box. A diffuser is embedded in one side wall of the preheating box. A conveying air duct is connected through one side of the diffuser. Multiple sets of electric heating tubes are integrated inside the conveying air duct. A blower is set at one end of the conveying air duct. Notches are opened in the side walls of the preheating box and the cooling box. A roller is rotatably connected to one side of the notch inside the preheating box and the cooling box.

[0007] Preferably, by setting a notch structure, continuous conveying of kraft paper material between the cooling box and the preheating box can be achieved. Two sets of adjustment mechanisms, together with idlers, can dynamically adjust the tension of the substrate before hot pressing and the finished paper after hot pressing, ensuring a stable conveying state of the material in the device. The blower delivers air evenly to the inside of the preheating box through the conveying duct and diffuser. The airflow is heated by the electric heating tube array to form a hot air circulation, which effectively preheats the kraft paper material passing through the preheating box, providing suitable initial temperature conditions for the subsequent hot pressing operation. After the hot pressing operation is completed, the material is cooled down inside the cooling box.

[0008] Preferably, the cooling box is equipped with an indoor refrigeration unit, and the cooling box is equipped with an outdoor refrigeration unit at the top. The indoor and outdoor refrigeration units work together through a refrigerant circulation loop.

[0009] Preferably, an air collector hood is fixedly installed around the heat output port of the outdoor unit of the refrigeration unit, and a return air duct is connected to one end of the air collector hood, which is connected to the exhaust fan.

[0010] As a preferred option, both the delivery duct and the return duct are made of thermal insulation material.

[0011] Preferably, the hot pressing mechanism includes a support frame fixedly installed on the upper end of the frame, and two sets of hot pressing rollers arranged vertically are rotatably connected inside the support frame. The hot pressing rollers are common electric heating rollers.

[0012] Preferably, the adjustment mechanism includes a mounting frame, an internal threaded frame, and a tension roller. The mounting frame is fixedly installed on the upper end of the frame, the internal threaded frame is slidably connected to the inside of the mounting frame, and the tension roller is rotatably connected to the inside of the internal threaded frame.

[0013] Preferably, the adjustment mechanism includes a threaded rod and a drive motor. The threaded rod is rotatably connected to the inside of the mounting bracket, passes through the internal threaded bracket and is threadedly connected to it, and the drive motor is fixedly installed on the upper end of the mounting bracket. The output end of the drive motor is fixedly connected to the threaded rod.

[0014] The beneficial effects of this utility model are:

[0015] 1. Before hot pressing the kraft paper material, it enters the preheating box through the notch. The blower uses the conveying air duct and diffuser to uniformly supply air into the preheating box. The airflow is heated by the electric heating tube array to form a hot air circulation, which effectively preheats the kraft paper material that has passed through the preheating box, providing suitable initial temperature conditions for the subsequent hot pressing mechanism.

[0016] 2. During operation, the hot airflow emitted by the outdoor unit of the refrigeration unit can be effectively collected by the air collection hood. Under the action of the induced draft fan, the airflow is transported to the preheating box through the return air duct and the delivery air duct to form a thermal energy cycle. When the device enters a stable operating state, this thermal energy cycle can significantly reduce the heating load of the electric heating tube array. Attached Figure Description

[0017] Figure 1 The diagram shown is a first three-dimensional structural schematic of the hot pressing device for kraft paper laminated composite according to this utility model.

[0018] Figure 2 The diagram shown is a second three-dimensional structural schematic of the hot pressing device for kraft paper laminated composite according to this utility model.

[0019] Figure 3 The diagram shown is a three-dimensional cross-sectional view of the preheating box of the hot pressing device for kraft paper film lamination according to this utility model.

[0020] Figure 4 The diagram shown is a three-dimensional structural schematic of the cooling box of the hot pressing device for kraft paper laminated composite according to this utility model.

[0021] Figure 5 The diagram shown is a three-dimensional structural schematic of the adjusting mechanism of the hot pressing device for kraft paper laminated composite according to this utility model.

[0022] Explanation of reference numerals in the attached drawings: 1. Frame; 2. Preheating box; 201. Conveying air duct; 202. Exhaust fan; 203. Electric heating element; 204. Diffuser; 3. Cooling box; 301. Indoor refrigeration unit; 302. Outdoor refrigeration unit; 303. Air collection hood; 304. Return air duct; 4. Notch; 401. Idler roller; 501. Support frame; 502. Hot press roller; 601. Mounting frame; 602. Internal threaded frame; 603. Tensioning roller; 604. Threaded rod; 605. Drive motor. Detailed Implementation

[0023] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0024] Please see Figure 1 , Figure 2 and Figure 3This utility model provides an embodiment: a hot pressing device for kraft paper laminated composite, including a frame 1, a preheating box 2, a cooling box 3, a hot pressing mechanism, and two sets of adjustment mechanisms. The preheating box 2 and the cooling box 3 are both fixedly installed on the upper end of the frame 1. The hot pressing mechanism is located between the preheating box 2 and the cooling box 3. The two sets of adjustment mechanisms are respectively located at the discharge end of the cooling box 3 and the feed end of the preheating box 2. A diffuser 204 is embedded in one side wall of the preheating box 2. A conveying air duct 201 is connected through one side of the diffuser 204. Multiple sets of electric heating tubes 203 arranged in an array are integrated inside the conveying air duct 201. A blower 202 is installed at one end of the conveying air duct 201. Notches 4 are opened on the side walls of both the preheating box 2 and the cooling box 3. Both the hot box 2 and the cooling box 3 have rollers 401 rotatably connected to one side of the internal notch 4. The notch 4 structure enables continuous conveying of kraft paper material between the cooling box 3 and the preheating box 2. The two sets of adjustment mechanisms, together with the rollers 401, can dynamically adjust the tension of the substrate before hot pressing and the finished paper after hot pressing, ensuring the stable conveying state of the material in the device. The blower 202 delivers air evenly to the inside of the preheating box 2 through the conveying air duct 201 and the diffuser 204. After the airflow is heated by the array of electric heating tubes 203, it forms a hot air circulation, effectively preheating the kraft paper material that has passed through the preheating box 2, providing suitable initial temperature conditions for the subsequent hot pressing operation. After the hot pressing operation is completed, the material is cooled down inside the cooling box 3.

[0025] Please see Figure 2 and Figure 4 In this embodiment, an indoor cooling unit 301 is installed inside the cooling box 3, and an outdoor cooling unit 302 is installed at the top of the cooling box 3. The indoor cooling unit 301 and the outdoor cooling unit 302 work together through a refrigerant circulation loop. The indoor cooling unit 301 cools the interior of the cooling box 3 through a heat exchange mechanism, and the outdoor cooling unit 302 discharges the heat generated by the heat exchange to the outside. A heat collection hood 303 is fixedly installed around the heat output port of the outdoor cooling unit 302, and one end of the heat collection hood 303 is connected to a return flow circuit. The air duct 304 and the return air duct 304 are connected to the exhaust fan 202. Both the delivery air duct 201 and the return air duct 304 are made of thermal insulation material. By setting up the air collection hood 303, the hot airflow emitted by the outdoor unit 302 can be effectively collected. Under the action of the exhaust fan 202, it is transported to the preheating box 2 through the return air duct 304 and the delivery air duct 201 to form a thermal energy circulation. When the device enters a stable operating state, this thermal energy circulation can significantly reduce the heating load of the electric heating tube 203 array and achieve energy consumption optimization.

[0026] Please see Figure 1 and Figure 5In this embodiment, the hot pressing mechanism includes a support frame 501 fixedly installed on the upper end of the frame 1. Two sets of vertically arranged hot pressing rollers 502 are rotatably connected inside the support frame 501. The hot pressing rollers 502 are commonly used electrically heated rollers. By installing the hot pressing rollers 502 on the support frame 501, and driving the two sets of hot pressing rollers 502 to rotate synchronously in opposite directions via an external drive system, effective hot pressing and laminating of the multi-layer kraft paper substrate passing through the gap between the two sets of hot pressing rollers 502 can be achieved. The adjustment mechanism includes a mounting frame 601, an internal threaded frame 602, and a tension roller 603. The mounting frame 601 is fixedly installed on the upper end of the frame 1, the internal threaded frame 602 is slidably connected inside the mounting frame 601, and the tension roller 603... The adjusting mechanism, rotatably connected to the interior of the internal threaded frame 602, includes a threaded rod 604 and a drive motor 605. The threaded rod 604 is rotatably connected to the interior of the mounting frame 601, passes through the internal threaded frame 602 and is threadedly connected to it. The drive motor 605 is fixedly installed on the upper end of the mounting frame 601, and its output end is fixedly connected to the threaded rod 604. By passing the kraft paper material under the tension roller 603 and then around the top of the idler roller 401 to form a conveying path, the drive motor 605 drives the threaded rod 604 to rotate, which in turn drives the internal threaded frame 602 to move up and down along the guide rail of the mounting frame 601, thereby realizing the dynamic adjustment of the kraft paper tension and ensuring the stability of material conveying.

[0027] First, the two layers of kraft paper and the film substrate conveyed by the external unwinding equipment are inserted from the lower end of a set of tension rollers 603, and then enter the preheating box 2 through the notch 4, bypassing the top of the idler roller 401. After exiting the preheating box 2, they pass through the gap between the two sets of hot pressing rollers 502, and then enter the upper part of the idler roller 401 in the cooling box 3 through the notch 4. Finally, they pass through the lower end of another set of tension rollers 603 and connect to the external winding equipment.

[0028] During operation, the drive motor 605 drives the threaded rod 604 to rotate, which in turn drives the internal threaded frame 602 to move up and down along the guide rail of the mounting frame 601. In turn, the tension roller 603 realizes the dynamic adjustment of the tightness of the kraft paper, ensuring the stability of material conveying.

[0029] The blower 202 delivers air evenly to the inside of the preheating box 2 through the conveying air duct 201 and the diffuser 204. The airflow is heated by the array of electric heating tubes 203 to form a hot air circulation, which effectively preheats the kraft paper material passing through the preheating box 2, providing suitable initial temperature conditions for the subsequent hot pressing mechanism operation, preventing the kraft paper material from directly entering the high-temperature pressing zone, which would cause wrinkles and bubbles and affect the composite quality. After preheating, the material passes through the gap between the two sets of hot pressing rollers 502. Under the drive of the external drive system, the two sets of hot pressing rollers 502 rotate in opposite directions synchronously to perform hot pressing on the material.

[0030] The cooling unit 301 uses a heat exchange mechanism to cool the inside of the cooling box 3, and the cooling unit 302 discharges the heat generated by the heat exchange to the outside. The hot-pressed material is cooled in the cooling box 3 and then wound up.

[0031] The heat-containing airflow emitted by the outdoor unit 302 can be effectively collected by the air collection hood 303. Under the action of the induced draft fan 202, it is transported to the preheating box 2 through the return air duct 304 and the conveying air duct 201 to form a heat energy cycle. When the device enters a stable operating state, this heat energy cycle can significantly reduce the heating load of the electric heating tube 203 array.

[0032] Through the above steps, the blower 202 uses the conveying air duct 201 and diffuser 204 to uniformly supply air into the preheating box 2. After the airflow is heated by the array of electric heating tubes 203, it forms a hot air circulation, which effectively preheats the kraft paper material passing through the preheating box 2, providing suitable initial temperature conditions for the subsequent hot pressing mechanism. This solves the problem that traditional hot pressing devices usually rely on high-power electric heating rollers to heat and press the material instantaneously. However, due to its physical properties, the kraft paper roll may have a certain amount of internal stress during the unwinding process. If it directly enters the high-temperature pressing zone, it is very easy to produce wrinkles and bubbles, which will affect the composite quality.

[0033] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A hot pressing device for laminating kraft paper film, comprising a frame (1), characterized in that: It also includes a preheating box (2), a cooling box (3), a hot pressing mechanism and two sets of adjustment mechanisms. The preheating box (2) and the cooling box (3) are fixedly installed on the upper end of the frame (1). The hot pressing mechanism is located between the preheating box (2) and the cooling box (3). The two sets of adjustment mechanisms are respectively set at the discharge end of the cooling box (3) and the feed end of the preheating box (2). A diffuser (204) is embedded in one side wall of the preheating box (2). A conveying air pipe (201) is connected through one side of the diffuser (204). Multiple sets of electric heating tubes (203) are integrated inside the conveying air pipe (201). A blower (202) is set at one end of the conveying air pipe (201). A notch (4) is opened on the side wall of the preheating box (2) and the cooling box (3). A roller (401) is rotatably connected to one side of the notch (4) inside the preheating box (2) and the cooling box (3).

2. The hot pressing device for kraft paper laminated composite according to claim 1, characterized in that: The cooling box (3) is equipped with an indoor cooling unit (301) and an outdoor cooling unit (302) at the top of the cooling box (3). The indoor cooling unit (301) and the outdoor cooling unit (302) work together through a refrigerant circulation loop.

3. The hot pressing device for kraft paper laminated composite according to claim 2, characterized in that: An air collector hood (303) is fixedly installed around the heat output port of the outdoor unit (302). One end of the air collector hood (303) is connected to a return air duct (304), which is connected to the exhaust fan (202).

4. The hot pressing device for kraft paper laminated composite according to claim 3, characterized in that: Both the delivery duct (201) and the return duct (304) are made of thermal insulation material.

5. The hot pressing device for kraft paper laminated composite according to claim 1, characterized in that: The hot pressing mechanism includes a support frame (501) fixedly installed on the upper end of the frame (1). The support frame (501) is rotatably connected to two sets of hot pressing rollers (502) arranged vertically. The hot pressing rollers (502) are common electric heating rollers.

6. The hot pressing device for kraft paper laminated composite according to claim 1, characterized in that: The adjustment mechanism includes a mounting frame (601), an internal threaded frame (602), and a tension roller (603). The mounting frame (601) is fixedly installed on the upper end of the frame (1), the internal threaded frame (602) is slidably connected to the inside of the mounting frame (601), and the tension roller (603) is rotatably connected to the inside of the internal threaded frame (602).

7. The hot pressing device for kraft paper laminated composite according to claim 6, characterized in that: The adjustment mechanism includes a threaded rod (604) and a drive motor (605). The threaded rod (604) is rotatably connected to the inside of the mounting bracket (601). The threaded rod (604) passes through the internal threaded bracket (602) and is threadedly connected to it. The drive motor (605) is fixedly installed on the upper end of the mounting bracket (601). The output end of the drive motor (605) is fixedly connected to the threaded rod (604).

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