Hot melt adhesive sheet forming machine

Abstract

The utility model discloses a hot melt adhesive sheet forming machine which comprises a machine frame, an upper conveying belt, a lower conveying belt, a driving mechanism, a thermocompression bonding device and a cooling device, the upper conveying belt and the lower conveying belt are used for clamping and conveying a hot melt adhesive sheet, the driving mechanism is used for driving the upper conveying belt and the lower conveying belt to move, and the thermocompression bonding device and the cooling device are sequentially arranged in the conveying direction. After the pressing air bag is inflated, the two conveying belts and the hot melt adhesive sheet clamped and conveyed between the two conveying belts can be pressed and tightly attached to the low-temperature freezing plate together to be cooled. According to the hot melt adhesive sheet forming machine, after the adhesive sheet is subjected to hot press forming, the cooling device is used for conducting and cooling one side, located on the upper conveying belt, of the hot melt adhesive sheet so that the hot melt adhesive sheet can be separated from the conveying belt, and therefore the adverse effect caused by the fact that the conveying belt is adhered and the hot melt adhesive sheet enters the machine again along with the conveying belt to be repeatedly machined is avoided; and the reject ratio caused thereby is reduced.

Description

Technical Field

[0001] The utility model relates to a hot melt adhesive sheet forming machine, in particular to a hot melt adhesive sheet forming machine used for processing bevel edges of hot melt adhesive sheets, which can be used for processing leather goods such as shoes, bags and the like. Background Art

[0002] During the processing of leather products such as shoes and bags, it is necessary to process a hot melt adhesive sheet with a thin beveled edge to assist in the shaping of shoes and bags. For example, the hot melt adhesive sheet used to assist in the shaping of the front and back uppers in the shoemaking process. At present, the bevels on the edges of the hot melt adhesive sheets used in shoemaking are mainly processed by hot melt adhesive sheet forming machines. After the hot melt adhesive sheet enters the machine, it is first clamped and transported to the heating device by the upper and lower conveyor belts to heat and melt, and then compacted to make the edges thinner to form a bevel. Then it is transported to the freezing device by the conveyor belt to cool and shape the hot melt adhesive sheet as a whole, and finally it is sent out from the outlet by the conveyor belt to complete the processing. During the entire processing process, the hot-melt adhesive sheet and the conveyor belts on both sides are cooled simultaneously and synchronously. The compacted hot-melt Hongbao adhesive sheet is easy to stick to the conveyor belt, especially when it cannot fall off at the exit of the upper conveyor belt. Workers are needed to assist, which increases labor costs. If the workers do not notice, the processed Hongbao adhesive sheet will stick to the upper conveyor belt and enter the machine for processing again, resulting in defective products and affecting quality. There is even the possibility that the Hongbao adhesive sheet will vibrate and fall into the machine during the circulation of the upper conveyor belt due to the lack of clamping force, causing machine failure, which has a great impact on normal production. Utility Model Content

[0003] The utility model aims to overcome the defects of the prior art and provide a hot melt adhesive sheet forming machine and a forming process thereof which can better prevent the hot melt adhesive sheet from adhering to a conveyor belt.

[0004] The hot melt adhesive sheet forming machine described in the utility model comprises a frame, an upper conveyor belt and a lower conveyor belt for clamping the hot melt adhesive sheet for conveying, a driving mechanism for driving the upper and lower conveyor belts to move, and a heat pressing device and a cooling device arranged in sequence along the conveying direction. The cooling device comprises a low-temperature freezing plate located on one side of the conveyor belt, and a pressing airbag located on the other side of the conveyor belt. After the pressing airbag is inflated, the two conveyor belts and the hot melt adhesive sheet clamped and conveyed in the middle can be pressed together and pressed against the low-temperature freezing plate for cooling.

[0005] The hot melt adhesive sheet forming machine described in the utility model does not directly cool the upper and lower sides at the same time after the hot melt adhesive sheet is hot-pressed and formed, but uses a cooling device to conduct single-sided conduction cooling on one side of the hot melt adhesive sheet. The single-sided conduction cooling causes the hot melt adhesive sheet and the upper and lower conveyor belts to cool down in sequence. Therefore, during the cooling process, the hot melt adhesive sheet will be separated from the conveyor belt and no longer adhere to it, thereby avoiding the adverse effects caused by the hot melt adhesive sheet entering the machine again with the conveyor belt for repeated processing due to adhesion to the conveyor belt, thereby reducing the defective rate caused by this. In addition, the setting of the pressing airbag can automatically find balance during pressing and cooling, ensuring that the hot melt adhesive sheet with uneven thickness after forming can be completely attached to the low-temperature freezing plate at all places, and the whole surface can be pressed and cooled. It not only has a better heat transfer effect, but also can cool the entire surface. BRIEF DESCRIPTION OF THE DRAWINGS

[0006] Figure 1 It is an overall schematic diagram of the hot melt adhesive sheet forming machine of the utility model;

[0007] Figure 2 for Figure 1 Schematic diagram of the structure after removing the side panels;

[0008] Figure 3 It is a schematic diagram of a rapid precooling device of a hot melt adhesive sheet forming machine of the utility model;

[0009] Figure 4 for Figure 2 Schematic diagram of the structure after removing the driving mechanism;

[0010] Figure 5 It is a structural schematic diagram of a rapid precooling device;

[0011] Figure 6 The figure is a schematic diagram of the structure of a heat pressing device.

[0012] Figure 7 The figure is a schematic diagram of the structure of a heat pressing device. DETAILED DESCRIPTION

[0013] The following will be combined with the accompanying drawings to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0014] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back, top, bottom, inside, outside, vertical, horizontal, longitudinal, counterclockwise, clockwise, circumferential, radial, axial...), then the directional indication is only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0015] like Figure 1 , Figure 2 As shown, a hot melt adhesive sheet forming machine comprises a frame 1, an upper conveyor belt 2 and a lower conveyor belt 3 for clamping the hot melt adhesive sheet for conveying, a driving mechanism 4 for driving the upper and lower conveyor belts to move, and a heat pressing device 5 and a cooling device 6 arranged in sequence along the conveying direction, wherein the cooling device 6 is Figure 3 , including a low-temperature freezing plate 61 located on one side of the conveyor belt, and a pressing airbag 62 located on the other side of the conveyor belt. After the pressing airbag 62 is inflated, the two conveyor belts and the hot-melt Hongbao film sandwiched and transported in the middle can be pressed together and tightly attached to the low-temperature freezing plate 61.

[0016] The low-temperature freezing plate can be located on the upper side of the conveyor belt, and the pressing airbag can be located on the lower side of the conveyor belt, or the low-temperature freezing plate can be located on the lower side of the conveyor belt, and the pressing airbag can be located on the upper side of the conveyor belt.

[0017] When processing the hot-melt adhesive sheet, the hot-melt adhesive sheet is placed between the upper conveyor belt 2 and the lower conveyor belt 3, and is clamped and conveyed by the two conveyor belts; then the hot-melt adhesive sheet is heated in a hot pressing device, so that the temperature of the hot-melt adhesive sheet is raised to the hot pressing temperature and the hot-melt adhesive sheet in a hot-melt state is compacted, so that the hot-melt adhesive sheet forms an inclined thin edge at the edge; then a cooling device is used for cooling, and the pressing airbag on one side of the cooling device is inflated to press the formed hot-melt adhesive sheet tightly against the low-temperature freezing plate on the other side, so that the formed hot-melt adhesive sheet is quickly cooled on one side. Because it is a one-sided conduction cooling, the order of shrinkage is different and the shrinkage coefficients of different materials are also different. The hot-melt adhesive sheet will be displaced and separated from the upper conveyor belt due to different shrinkage amounts and will no longer adhere to it. When the upper and lower conveyor belts are separated, the hot-melt adhesive sheet will not adhere to the upper conveyor belt, but will be transported to the outlet by the lower conveyor belt. The single-sided cooling of the hot-melt adhesive sheet in the cooling device and the cooling method of single-sided heat conduction are used to cleverly solve the problem of the hot-melt adhesive sheet adhering to the upper conveyor belt and reduce the defective rate caused thereby.

[0018] The heat pressing device 5 may include a high-temperature heating plate 51 located on one side of the conveyor belt, and a shaping airbag 52 located on the other side of the conveyor belt. After the shaping airbag 51 is inflated, the two conveyor belts and the hot-melt adhesive sheet sandwiched and conveyed in the middle can be pressed against the high-temperature heating plate 51, and the edge of the hot-melt adhesive sheet is flattened and shaped to form an inclined surface. The conveyor belt, hot-melt adhesive sheet and high-temperature heating plate are pressed together by the airbag structure. Due to the adaptability of the airbag, the components can always be kept in close contact during the film forming and edge shape change process, thereby better ensuring the forming quality of the edge of the Gangbao film.

[0019] The heat pressing device 5 may also have a high temperature heating plate 51 on one side and a shaping plate driven by a cylinder or electric screw on the other side. The shaping plate is driven by the cylinder or electric screw to press the two conveyor belts and the conveyor belts sandwiched in the middle together on the high temperature heating plate to perform edge shaping.

[0020] The shaping airbag 52 of the heat pressing device 5 can be provided with a hard flat heat pressing plate 53 on the pressing side, and a silicone pad layer 55 is provided on the heat pressing plate 53. The heat pressing plate 53 can provide a more uniform pressing force, and the silicone pad layer can better maintain the overall flatness of the product, so that it is easier to obtain a satisfactory flatness and edge pressing and thinning molding effect.

[0021] Furthermore, a silicone foaming layer 54 may be provided between the hot pressing plate 53 and the silicone pad layer 55. Figure 6 The hot pressing plate 53 can provide a more uniform pressing force, the silicone cushion layer can better maintain the overall flatness of the product, and the silicone foam layer can play a role of rebounding and squeezing, thereby further improving the flatness of the product and the molding effect of edge pressing and thinning.

[0022] The cooling device 6 can also be provided with a hard flat cold pressing plate 63 on the pressing side of the pressing airbag 62, and a silicone pad layer 65 or a silicone foam layer 64 is provided on the cold pressing plate 63. While the cold pressing plate 63 provides a more uniform pressing force, the silicone pad layer can better maintain the overall flatness of the product, and the silicone foam layer can provide elasticity and extrusion, so that the hot melt adhesive sheet can be better and more fully attached to the low-temperature freezing plate.

[0023] Furthermore, the rapid cooling device 6, such as Figure 5 As shown, a silicone foaming layer 64 and a silicone cushion layer 65 thereon may be sequentially arranged on the cold pressing plate 63 on the top of the pressing airbag 62 .

[0024] The hot melt adhesive sheet forming machine may have two heat pressing devices 5, such as Figure 2As shown, there are first heat pressing device 5a and second heat pressing device 5b, both of which include a high temperature heating plate 51 located on one side of the conveyor belt and a shaping air bag 52 located on the other side of the conveyor belt. By providing two heat pressing devices, the hot melt adhesive sheet can be heat pressed twice in the heat pressing forming step, thereby ensuring the forming quality of the edge bevel of the hot melt adhesive sheet.

[0025] The high temperature heating plates 51 of the first heat pressing device 5a and the second heat pressing device 5b can be connected as a whole to make the product structure simpler.

[0026] The lower conveyor belt 3 is also provided with a discharge section 31 for continuing to feed materials behind the upper conveyor belt 2. Figure 4 . Through the setting of the discharge section, after the upper conveyor belt is separated from the lower conveyor belt, the hot melt adhesive sheet can continue to be transported with the discharge section of the lower conveyor belt. Especially in this case, the low-temperature freezing plate is located on the upper side of the conveyor belt, and the pressing airbag is located on the lower side of the conveyor belt. It can reduce the time required for low-temperature cooling. After the upper conveyor belt is disengaged from the hot melt adhesive sheet after rapid cooling, when the lower conveyor belt has not yet completely disengaged, the pressing airbag and the low-temperature freezing plate can be separated and transported forward. The hot melt adhesive sheet can be transported with the discharge section and naturally cooled at room temperature during the forward conveyance of the discharge belt. It can shorten the time required for the entire processing and improve production efficiency. And when separating the pressing airbag and the low-temperature freezing plate, since the hot melt adhesive sheet has not yet completely disengaged, in this process, there will be no conveying slippage caused by the vibration caused by the rapid disengagement of the pressing airbag and the low-temperature freezing plate after they have been completely disengaged, thereby avoiding the defects caused by slippage and subsequent product overlap.

[0027] A feeding section 32 is also provided in front of the lower conveyor belt 3 and the upper conveyor belt 2. Figure 2 , Figure 1 Through the setting of the feeding section, the hot melt adhesive sheet that has not fallen off due to adhesion to the lower conveyor belt at the outlet can be intuitively discovered and removed by the operator before entering the feeding port 7 between the upper and lower conveyor belts again, thereby preventing the hot melt adhesive sheet from entering the equipment for processing again from the feeding port, thereby avoiding product defects caused by this.

[0028] The discharge port 8 can be arranged at the rear side of the frame 1 and behind the lower conveyor belt. Figure 7 After the upper and lower conveyor belts are separated, the lower conveyor belt carries the formed hot melt adhesive sheet and continues to transport it backward to the discharge port.

[0029] The discharge port 8 can also be arranged at the front side of the frame 1, such as Figure 4A third conveyor belt 9 is arranged below the lower conveyor belt. The third conveyor belt cooperates with the rear part of the discharge section 31 of the lower conveyor belt and the lower side 33 of the lower conveyor belt, and clamps and conveys the hot melt adhesive sheet to the discharge port on the front side of the frame together with the lower conveyor belt. After separating from the upper conveyor belt, the formed hot melt adhesive sheet will enter between the third conveyor belt and the lower conveyor belt, and continue to be clamped and conveyed to the front side of the frame by the third conveyor belt and the lower conveyor belt, and is located on the same side of the frame as the feed port, so that the discharge and feed operations can be completed by the same person, which can further reduce labor.

[0030] A material receiving box 10 may be provided at the front side of the frame 1 to connect with the material outlet 8 and receive the hot melt adhesive sheet sent out from the material outlet.

[0031] The third conveyor belt 9 may be provided with a discharging section 91 which is inclined downward at the discharging port 8 , so as to facilitate the discharging of the hot melt adhesive sheet to the receiving box 10 .

[0032] The hot melt adhesive sheet forming machine can not only perform the edge pressing and forming processing of the hot melt adhesive sheet, but also stack the hot melt adhesive sheet and leather on a conveyor belt for pressing. While realizing the bevel forming of the edge of the hot melt adhesive sheet, it can also directly complete the bonding operation of the hot melt adhesive sheet and the leather, thereby directly omitting the subsequent shoe or bag making process. One machine has two uses, saving technology and improving production efficiency.

[0033] The above description is only a preferred embodiment of the utility model, and does not limit the patent scope of the utility model. All equivalent structural changes made by using the contents of the utility model specification and drawings under the utility model concept, or directly / indirectly used in other related technical fields are included in the patent protection scope of the utility model.

Claims

1. A hot melt adhesive sheet forming machine, comprising a frame (1), an upper conveyor belt (2) and a lower conveyor belt (3) for clamping and conveying the hot melt adhesive sheet, a driving mechanism (4) for driving the upper and lower conveyor belts, and a heat pressing device (5) and a cooling device (6) arranged in sequence along the conveying direction, characterized in that: The cooling device (6) comprises a low-temperature freezing plate (61) located on one side of the conveyor belt, and a pressing airbag (62) located on the other side of the conveyor belt. After the pressing airbag is inflated, the upper and lower conveyor belts and the hot melt adhesive sheet sandwiched and conveyed in the middle can be pressed together and tightly attached to the low-temperature freezing plate for cooling.

2. The hot melt adhesive sheet forming machine according to claim 1, characterized in that: The heat pressing device (5) comprises a high-temperature heating plate (51) located on one side of the conveyor belt, and a shaping airbag (52) located on the other side of the conveyor belt. After the shaping airbag (52) is inflated, the two conveyor belts and the hot melt adhesive sheet sandwiched and conveyed in between can be pressed together and pressed against the high-temperature heating plate (51) to shape the edges.

3. The hot melt adhesive sheet forming machine according to claim 1, characterized in that: A hard, flat cold pressing plate (63) is provided on the pressing side of the pressing airbag (62), and a silicone cushion layer (65) or a silicone foaming layer (64) is further provided on the cold pressing plate (63).

4. The hot melt adhesive sheet forming machine according to claim 1, characterized in that: A hard flat cold pressing plate (63) is arranged on the pressing side of the pressing airbag (62), and a silicone foaming layer (64) and a silicone cushion layer (65) are arranged in sequence on the cold pressing plate (63).

5. The hot melt adhesive sheet forming machine according to claim 2, characterized in that: There are two heat pressing devices (5), a first heat pressing device (5a) and a second heat pressing device (5b), and both heat pressing devices include a high-temperature heating plate (51) located on one side of the conveyor belt, and a shaping air bag (52) located on the other side of the conveyor belt.

6. The hot melt adhesive sheet forming machine according to claim 2, characterized in that: The shaping airbag (52) is provided with a hard flat hot pressing plate (53) on the pressing side, and a silicone foaming layer (54) and a silicone cushion layer (55) are sequentially provided on the hot pressing plate (53).

7. The hot melt adhesive sheet forming machine according to any one of claims 1 to 6, characterized in that: The lower conveyor belt (3) is also provided with a discharge section (31) for continuing to feed materials behind the upper conveyor belt (2).

8. The hot melt adhesive sheet forming machine according to any one of claims 1 to 6, characterized in that: The lower conveyor belt (3) is also provided with a feeding section (32) at a position in front of the upper conveyor belt (2).

9. The hot melt adhesive sheet forming machine according to claim 7, characterized in that: The low-temperature freezing plate (61) is located on the upper side of the conveyor belt, and the pressing air bag (62) is located on the lower side of the conveyor belt.

10. The hot melt adhesive sheet forming machine according to claim 8, characterized in that: A third conveyor belt (9) is arranged below the lower conveyor belt, and the third conveyor belt cooperates with the rear part of the discharge section of the lower conveyor belt and the lower side (33) of the lower conveyor belt, and clamps and conveys the hot melt adhesive sheet to the discharge port (8) on the front side of the frame together with the lower conveyor belt.

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