A hot melt adhesive finished product and a production method, a use method and a shaping mold thereof

Abstract

This application discloses a hot melt adhesive finished product, its production method, usage method, and molding die. The method includes the following steps: adjusting the molding die to a first state, wherein the molding die has a molding cavity that is identical in shape to the melting cavity but slightly smaller than its outline; the melting cavity is the cavity of the melting tool; the inner wall of the molding cavity is coated with a release agent; injecting liquid hot melt adhesive into the molding cavity to a set height; cooling, wherein the liquid hot melt adhesive solidifies to form the hot melt adhesive finished product; adjusting the molding die to a second state, wherein the molding die has a demolding space larger than the molding cavity; and removing the hot melt adhesive finished product from the demolding space. This application uses separate molding and cooling of the hot melt adhesive to form a finished product that conforms to the size and outline of the melting cavity of the melting tool, eliminating the need for multi-purpose melting tools, ensuring the integration of large hot melt adhesive finished products and their fit with the melting tool, resulting in minimal or no air bubbles during hot melt adhesive melting.

Description

Technical Field

[0001] This disclosure generally relates to the field of hot melt adhesive production, and specifically to a hot melt adhesive finished product and its production method, usage method and molding die. Background Technology

[0002] Hot melt adhesive is a crucial raw material in label production. The finished product is solid and is melted by the label manufacturer before being transferred to the production line. The absence or minimization of air bubbles during hot melt adhesive melting is a critical factor affecting label production. Therefore, directly molding the hot melt adhesive within a melting vessel and gradually melting it from top to bottom using a hot melt pressing plate is a cost-effective production method. Because the hot melt adhesive in the melting vessel solidifies directly during production, the finished product is seamless and airtight, resulting in a bubble-free liquid adhesive – a preferred method for producing hot melt adhesive.

[0003] The aforementioned melting equipment performs three functions: it serves as a forming container in the production process, a packaging tool during transportation, and a melting tool for the user. Therefore, it needs to be transported back and forth multiple times. If it is bumped or knocked during transportation, the hot melt pressing plate will be unable to enter for melting, resulting in scrap. Summary of the Invention

[0004] In view of the above-mentioned defects or deficiencies in the prior art, it is desirable to provide a hot melt adhesive finished product, its production method, its application method and its molding die.

[0005] In a first aspect, this application provides a method for producing a hot melt adhesive product, the method comprising the following steps:

[0006] The molding die is adjusted to a first state, wherein the molding die has a molding cavity that is identical in shape to the melting cavity and slightly smaller than the outline of the melting cavity; the melting cavity is the cavity of the melting tool, which is a tool used to melt the hot melt adhesive product; the inner wall of the molding cavity is coated with a release agent;

[0007] Inject liquid hot melt adhesive into the molding cavity to the set height;

[0008] Cooling: The liquid hot melt adhesive cools and solidifies to form the finished hot melt adhesive product.

[0009] The molding die is adjusted to the second state, in which the molding die forms a demolding space larger than the molding cavity;

[0010] Remove the hot melt adhesive product from the demolding space.

[0011] Secondly, this application provides a method for producing a hot melt adhesive product, the method comprising the following steps:

[0012] The molding die is adjusted to the first state, wherein the molding die has a molding cavity that is identical in shape to the melting cavity and slightly smaller than the outline of the melting cavity; the melting cavity is the cavity of the melting tool, and the melting tool is a tool used to melt the hot melt adhesive product;

[0013] The protective film bag is placed inside the top-opening molding die, so that the opening edge of the protective film bag is turned outward and exposed through the opening of the molding die.

[0014] Inject liquid hot melt adhesive into the protective film bag to the set height;

[0015] Seal the opening of the protective film bag;

[0016] Cooling: The liquid hot melt adhesive cools and solidifies, forming a single hot melt adhesive product with the protective film bag.

[0017] The molding die is adjusted to the second state, in which the molding die forms a demolding space larger than the molding cavity;

[0018] Remove the hot melt adhesive product from the demolding space.

[0019] Thirdly, this application provides a hot melt adhesive product prepared using the above-described hot melt adhesive product production method.

[0020] Fourthly, this application provides a method for using a hot melt adhesive product, comprising the following steps:

[0021] The above-mentioned hot melt adhesive product is placed into a melting vessel, the melting vessel having a melting cavity that is the same shape as the melting cavity and slightly larger than the outline of the melting cavity;

[0022] The hot melt adhesive product is pressed with a liftable hot melt pressure plate, and the solid hot melt adhesive on the surface of the hot melt adhesive product is melted into a liquid state.

[0023] The liquid hot melt adhesive on the surface of the finished hot melt adhesive product is drawn into the production line for use.

[0024] Fifthly, this application provides a molding die applied to the above-mentioned hot melt adhesive finished product production method, comprising:

[0025] A molding die with a cavity whose size and shape are not adjustable;

[0026] A shaped sheet is rolled up and placed within the receiving cavity; the shaped sheet has overlapping first and second ends;

[0027] When the molding die is in the first state, the overlap width of the first end and the second end is the first width, and the molding sheet is rolled up to form a molding cavity;

[0028] When the molding die is in the second state, the overlap width of the first end and the second end is the second width; the first width is narrower than the second width, and the molding sheet is rolled up to form a demolding space;

[0029] A first drive mechanism is used to adjust the degree of curling of the shaped sheet to adjust the overlap width of the first end and the second end.

[0030] According to the technical solution provided in the embodiments of this application, the first end is welded to the inner wall of the receiving cavity on the side near the inner wall of the receiving cavity; the side of the shaping sheet is provided with an arc-shaped toothed strip extending out of the shaping mold;

[0031] The first driving mechanism is a drive motor fixed to the outer wall of the shaping mold; a gear that meshes with the arc-shaped rack is fixed on the output shaft of the drive motor.

[0032] Fifthly, this application provides a molding die applied to the above-mentioned hot melt adhesive finished product production method, comprising:

[0033] A base having a shaped bottom surface that is identical in shape to the bottom surface of the melting chamber and slightly smaller than the bottom surface contour of the melting chamber; the shaped bottom surface having a midpoint.

[0034] The first template has a first forming sidewall;

[0035] The second template has a second molding sidewall;

[0036] The second driving mechanism is used to drive both the first template and the second template to slide along a first direction; the first direction is a direction that passes through the midpoint of the bottom surface and is parallel to the molded bottom surface;

[0037] The molding die has a first state and a second state; when the second driving mechanism drives the first template and the second template to move away from each other so that the molding die forms the first state, the molding bottom surface, the first molding sidewall and the second molding sidewall form a molding cavity that is consistent with the shape of the melting cavity and slightly smaller than the outline of the melting cavity; the melting cavity is the cavity of the melting tool, and the melting tool is a tool used to melt the hot melt adhesive product;

[0038] When the second driving mechanism drives the first template and the second template to move closer to each other, causing the molding mold to form a second state, the molding mold forms a demolding space larger than the molding cavity in the second state.

[0039] According to the technical solution provided in the embodiments of this application, the molding bottom surface protrudes from the base surface to form a boss; in the first state, the bottom of the first molding sidewall and the second molding sidewall abuts against the sidewall of the boss.

[0040] According to the technical solution provided in the embodiments of this application, the molding die further includes a clamping sleeve, which is used to fit over the first template and the second template in the first state.

[0041] In the technical solution of this application, the hot melt adhesive is individually shaped and cooled to form a finished product that conforms to the size and contour of the melting chamber of the melting tool. This eliminates the need for multi-purpose melting tools, saves on the use of melting tools, and reduces the cost of hot melt adhesive finished products. It is particularly suitable for hot melt adhesive finished products used for melting large pressure plates. In achieving the above effects, it ensures the integration of large hot melt adhesive finished products and their fit with the melting tool, ensures the requirements of bubble-free or low-bubble melting of hot melt adhesive, and ensures the production quality of the label production line in which the hot melt adhesive is used. Attached Figure Description

[0042] Other features, objects, and advantages of this application will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings:

[0043] Figure 1 This is a schematic diagram of the structure when the shaping mold and the shaping sheet are separated in Example 1;

[0044] Figure 2 This is a schematic diagram of the first state of the molding die in Example 1;

[0045] Figure 3 This is a schematic diagram of the second state of the molding die in Example 1;

[0046] Figure 4 This is a schematic diagram of the structure of the molding die in the first state, with the protective film bag covering it.

[0047] Figure 5 This is a flowchart illustrating Embodiment 2 of this application;

[0048] Figure 6 This is a schematic diagram of the second state of the molding die in Embodiment 4 of this application;

[0049] Figure 7 This is a schematic diagram of the first state of the molding die in Embodiment 4 of this application;

[0050] The following are the labeling elements in the diagram: 10. Shaping mold; 11. Receiving cavity; 21. First end; 22. Second end; 20. Shaping sheet; 30. First drive mechanism; 23. Arc-shaped rack; 31. Gear; 40. Protective film bag; 51. Base; 52. Shaping bottom surface; 53. First template; 53-1. First shaping sidewall; 54. Second template; 54.1. Second shaping sidewall; 55. Second drive mechanism. Detailed Implementation

[0051] The present application 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 invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, only the parts relevant to the invention are shown in the accompanying drawings.

[0052] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0053] Example 1

[0054] like Figures 1-4 As shown, this embodiment provides a molding die, including:

[0055] The shaping mold 10 has a receiving cavity 11 whose size and shape are not adjustable; in this embodiment, the shaping mold 10 is a cylindrical iron barrel with a closed bottom and an open top. In other embodiments, the shaping mold can also be made of other hard materials, such as wood, other metals, or cement castings; its diameter is 0.8-1.2 meters.

[0056] A shaped sheet 20 is rolled up and placed inside the receiving cavity 11; the shaped sheet 20 has overlapping first end 21 and second end 22; in this embodiment, the shaped sheet is a thin iron sheet with a thickness between 0.5 mm and 3 mm, and has a smooth inner surface (the side near the center of the receiving cavity).

[0057] like Figure 2 As shown, when the molding die is in the first state, the overlap width of the first end 21 and the second end 22 is the first width h1, and the molding sheet is rolled up to form a molding cavity;

[0058] like Figure 3 As shown, when the molding die is in the second state, the overlap width of the first end 21 and the second end 22 is the second width h2; the first width is narrower than the second width, and the molding sheet 20 is rolled up to form a demolding space;

[0059] The first drive mechanism 30 is used to adjust the degree of curling of the shaped sheet in order to adjust the overlap width of the first end and the second end.

[0060] In this embodiment, the first end 21 is welded to the inner wall of the receiving cavity 11 on the side near the inner wall of the receiving cavity; the side of the shaping sheet 20 is provided with an arc-shaped toothed rack 23 extending out of the shaping mold; that is, the side wall of the shaping mold 10 is provided with a side opening, and the arc-shaped toothed rack 23 extends out from the opening.

[0061] The first driving mechanism is a drive motor fixed to the outer wall of the shaping mold; a gear 31 that meshes with the arc-shaped rack is fixed on the output shaft of the drive motor.

[0062] During operation, the drive motor is first controlled to rotate, which in turn drives the arc-shaped rack to move, causing the plastic sheet to curl to form a plastic cavity with a first overlap width at the first end 21 and the second end 22; for example... Figure 4 As shown, the protective film bag 40 is then placed inside the molding cavity formed by the molding sheet, and liquid hot melt adhesive is poured into the protective film bag 40 to the set height. Figure 4 The first drive mechanism is located on the back of the figure and is therefore not shown. In this embodiment, the height of the shaping mold is more than 1 meter. In this embodiment, the height is set to the height of the melting cavity inside the melting vessel, or slightly less than the height of the melting cavity, for example, the height is set to 1.5 meters. After the liquid hot melt adhesive cools and solidifies, the protective film bag 40 forms a hot melt adhesive product between the solid hot melt adhesive. At this time, the drive motor is controlled to rotate, which drives the arc rack to move, thereby causing the plastic sheet to unroll to the first end 21 and the second end 22 to have a second overlapping width to form a demolding cavity. Since the demolding cavity is larger than the shaping cavity, a gap is formed between the hot melt adhesive product and the plastic sheet. The hot melt adhesive product can be taken out from the top of the shaping mold using a suction cup or by setting a lifting ring on the top of the protective film bag and lifting it out with a lifting robot.

[0063] In this embodiment, the width of the shaping sheet is greater than the circumference of the shaping mold, and the difference between the first width and the second width is 1-5mm. Since the first end is welded to the cavity of the shaping mold, when liquid hot melt adhesive is injected into the shaping cavity, most of the shaping sheet is in contact with the inner wall of the cavity. The hot melt adhesive product formed by shaping is basically slightly smaller than the outline of the shaping mold. In this embodiment, the outline and size of the shaping mold are consistent with the melting tool of the end using the hot melt adhesive product. Therefore, the end can just fit the hot melt adhesive product produced in this embodiment into its melting tool.

[0064] In this embodiment, the protective film bag is made of PE, which can be melted into hot melt adhesive and used without affecting the performance of the hot melt adhesive.

[0065] In some embodiments of this application, the degree of curling of the shaping sheet can also be adjusted by providing an adjusting rod extending from the side wall of the receiving cavity of the shaping mold on the side wall of the shaping sheet. An electric actuator, a pneumatic cylinder, or a hydraulic cylinder is provided on the outside of the shaping mold or on its side wall. The output shaft of the electric actuator, pneumatic cylinder, or hydraulic cylinder controls the adjusting rod to reciprocate in the circumferential tangential direction of the shaping mold, thereby adjusting the degree of curling of the shaping sheet.

[0066] Example 2

[0067] like Figure 5 As shown, corresponding to Example 1, this example provides a method for producing hot melt adhesive finished products. The method described in this example can be implemented using the molding die described in Example 1; the method includes the following steps:

[0068] S11. Adjust the molding die to the first state, wherein the molding die has a molding cavity that is consistent with the shape of the melting cavity and slightly smaller than the outline of the melting cavity in the first state; the melting cavity is the cavity of the melting tool, and the melting tool is a tool for melting hot melt adhesive finished products; in this embodiment, the melting tool is made of the same structure and material as the shaping die in Embodiment 1.

[0069] S12. Place the protective film bag inside the top-opening molding die, so that the opening edge of the protective film bag is turned outward and exposed in the opening of the molding die;

[0070] S13. Inject liquid hot melt adhesive into the protective film bag to the set height;

[0071] S14. Seal the opening of the protective film bag;

[0072] S15. Cooling: The hot melt adhesive product that forms an integral whole with the protective film bag after the liquid hot melt adhesive cools and solidifies.

[0073] S16. Adjust the molding mold to the second state, wherein the molding mold in the second state forms a demolding space larger than the molding cavity;

[0074] S17. Remove the hot melt adhesive product from the demolding space.

[0075] The hot melt adhesive production method of this embodiment uses a separate shaping and cooling process to form a finished product that conforms to the size and contour of the melting chamber of the melting tool. This eliminates the need for multi-purpose melting tools, saves on the use of melting tools, and reduces the cost of hot melt adhesive products. It is particularly suitable for hot melt adhesive products used for melting large pressure plates. In achieving the above effects, it ensures the integration of large hot melt adhesive products and their fit with the melting tool, guarantees the requirements of bubble-free or low-bubble melting of hot melt adhesive, and ensures the production quality of the label production line where the hot melt adhesive is used.

[0076] Example 3

[0077] Corresponding to Example 2, this example provides a method for using a hot melt adhesive product, including the following steps:

[0078] S21. The hot melt adhesive product is placed into a melting vessel, the melting vessel having a melting cavity that is the same shape as the melting cavity and slightly larger than the outline of the melting cavity; since the hot melt adhesive has a large volume and weight in this embodiment, it is preferable to use a suction cup to lift the cylindrical hot melt adhesive product from the top and place it into the melting vessel during the process of placing it into the melting vessel;

[0079] In some embodiments of this application, a mechanical gripper can also be used to surround and hold the upper part of the outer wall of the hot melt adhesive product and lift it into the melting vessel.

[0080] S22. Pressing the hot melt adhesive product with a liftable hot melt pressure plate to melt the solid hot melt adhesive on the surface of the hot melt adhesive product into a liquid state; the hot melt pressure plate gradually melts the hot melt adhesive placed in the melting chamber as needed and then sucks it out. This is existing technology, and its detailed principle will not be described here. In this embodiment, the edge of the pressure plate is originally provided with a sealing ring that fits against the side wall of the melting tool. Therefore, in this embodiment, the hot melt adhesive product prepared by the method of embodiment 2 and the molding mold of embodiment 1, after being placed in the melting tool, will form a gap with the inner wall of the melting tool, and this gap is sealed by the sealing strip on the edge of the hot melt pressure plate.

[0081] S23. Extract the liquid hot melt adhesive from the surface of the finished hot melt adhesive product to the production line for use.

[0082] Example 4

[0083] like Figures 6-7 As shown, this embodiment provides a molding die, including:

[0084] The base 51 has a shaped bottom surface 52 that is consistent with the shape of the bottom surface of the melting cavity and slightly smaller than the bottom surface outline of the melting cavity; the shaped bottom surface 52 has a midpoint.

[0085] The first template 53 has a first molding sidewall 53-1;

[0086] The second template 54 has a second molding sidewall 54-1;

[0087] The second driving mechanism 55 is used to drive both the first template 53 and the second template 54 to slide along a first direction; the first direction is the direction that passes through the midpoint of the bottom surface and is parallel to the forming bottom surface, i.e., the direction of arrow a in the figure;

[0088] In this embodiment, the second drive mechanism 55 includes two drive hydraulic cylinders, which are respectively set for the first template 53 and the second template 54. The bottoms of the first template and the second template are slidably locked onto the base 51.

[0089] The molding die has a first state and a second state; when the second driving mechanism 55 drives the first template and the second template to move away from each other so that the molding die forms the first state, the molding bottom surface 52, the first molding side wall 53-1 and the second molding side wall 54-1 form a molding cavity that is consistent with the shape of the melting cavity and slightly smaller than the outline of the melting cavity; the melting cavity is the cavity of the melting tool, and the melting tool is a tool used to melt the hot melt adhesive product;

[0090] When the second driving mechanism 55 drives the first template 53 and the second template 54 to move closer to each other, so that the molding mold forms a second state, the molding bottom surface 52, the first molding side wall 53-1 and the second molding side wall 54-1 form a demolding space larger than the molding cavity.

[0091] In this embodiment, the molding bottom surface 52 protrudes from the base surface to form a boss; in the first state, the bottom of the first molding sidewall and the second molding sidewall abuts against the sidewall of the boss.

[0092] In some embodiments of this application, both the first template 53 and the second template 54 are semi-cylindrical sheets, and their vertical sides are provided with sealing strips for contact. The part of the first template 53 that contacts the boss is also provided with an arc-shaped sealing strip; the part of the second template 54 that contacts the boss is also provided with an arc-shaped sealing strip. The sealing structure between the first template, the second template, and the boss creates a sealed molding cavity between the molding bottom surface 52, the first molding sidewall, and the second molding sidewall. When a release agent, such as ink, is applied to the molding bottom surface 52, the first molding sidewall, the second molding sidewall, and the part of the sealing strip located in the molding cavity, liquid hot melt adhesive can be directly injected into the molding cavity. After the hot melt adhesive has solidified, the first template and the second template can be separated by the second drive mechanism to remove the cylindrical hot melt adhesive product.

[0093] When the first template, the boss and the second template are not sealed together, the hot melt adhesive can also be shaped by covering the molding cavity with a protective film bag as described in Example 1.

[0094] In some embodiments of this application, the molding die further includes a clamping sleeve 60 for, in a first state, fitting over the first and second templates. The clamping sleeve 60 may, for example, be a resilient annular sleeve.

[0095] In this embodiment, there are two second driving mechanisms, namely hydraulic cylinders. The exposed ends of the piston rods of the two hydraulic cylinders are fixedly connected to the outside of the first template and the second template, respectively. By controlling the extension or retraction of the piston rods of the hydraulic cylinders, the molding die can be switched between the first state and the second state.

[0096] Example 5

[0097] Corresponding to Example 4, this example provides a method for producing hot melt adhesive finished products. The method described in this example can be implemented using the molding die described in Example 4. This example provides a method for producing hot melt adhesive finished products, the method comprising the following steps:

[0098] S31. Adjust the molding die to the first state, wherein the molding die has a molding cavity that is identical in shape to the melting cavity and slightly smaller than the outline of the melting cavity; the melting cavity is the cavity of the melting tool, and the melting tool is a tool used to melt the hot melt adhesive product; the inner wall of the molding cavity is coated with a release agent;

[0099] S32. Inject liquid hot melt adhesive into the molding cavity to the set height;

[0100] S33. Cooling: The liquid hot melt adhesive cools and solidifies to form the finished hot melt adhesive product;

[0101] S34. Adjust the molding die to the second state, wherein the molding die in the second state forms a demolding space larger than the molding cavity;

[0102] S35. Remove the hot melt adhesive product from the demolding space.

[0103] The hot melt adhesive production method of this embodiment uses a separate shaping and cooling process to form a finished product that conforms to the size and contour of the melting chamber of the melting tool. This eliminates the need for multi-purpose melting tools, saves on the use of melting tools, and reduces the cost of hot melt adhesive products. It is particularly suitable for hot melt adhesive products used for melting large pressure plates. In achieving the above effects, it ensures the integration of large hot melt adhesive products and their fit with the melting tool, guarantees the requirements of bubble-free or low-bubble melting of hot melt adhesive, and ensures the production quality of the label production line where the hot melt adhesive is used.

[0104] The above description is merely a preferred embodiment of this application and an explanation of the technical principles employed. Those skilled in the art should understand that the scope of the invention involved in this application is not limited to technical solutions formed by specific combinations of the above-described technical features, but should also cover other technical solutions formed by arbitrary combinations of the above-described technical features or their equivalents without departing from the inventive concept. For example, technical solutions formed by substituting the above features with (but not limited to) technical features with similar functions disclosed in this application.

Claims

1. A hot melt adhesive finished product molding mold, characterized in that, include: A molding die with a cavity whose size and shape are not adjustable; A shaped sheet is rolled up and placed inside the receiving cavity; the shaped sheet has overlapping first and second ends; the side of the first end closest to the inner wall of the receiving cavity is welded to the inner wall of the receiving cavity; When the molding die is in the first state, the overlap width of the first end and the second end is the first width, and the molding sheet is rolled up to form a molding cavity; When the molding die is in the second state, the overlap width of the first end and the second end is the second width; the first width is narrower than the second width, and the molding sheet is rolled up to form a demolding space; A first drive mechanism is used to adjust the degree of curling of the shaped sheet to adjust the overlap width of the first end and the second end.

2. The hot melt adhesive finished product molding mold according to claim 1, characterized in that, The first end is welded to the inner wall of the receiving cavity on the side closest to the inner wall of the receiving cavity; the side of the shaping sheet is provided with an arc-shaped toothed strip that extends out of the shaping mold; The first driving mechanism is a drive motor fixed to the outer wall of the shaping mold; a gear that meshes with the arc-shaped rack is fixed on the output shaft of the drive motor.

Images