A plastic product molding apparatus and a plastic product molding method

Abstract

The application discloses a plastic product forming device and a plastic product forming method. The device comprises a first mold assembly and a second mold assembly arranged in a vertical direction. The first mold assembly and the second mold assembly each comprise at least one mold. Each mold comprises a body cavity of a plastic product and a head cavity of the plastic product below the body cavity. The first mold assembly and the second mold assembly are configured to be alternately replaced in the vertical direction to form a continuous plastic product chain. The first mold assembly and the second mold assembly are alternately replaced to realize continuous production of the plastic product. Compared with the prior art, the device does not need to use multiple sets of molds to form a ring-shaped closed mold chain, and does not need to realize mold pairing and closing through rotation of the entire ring-shaped closed mold chain. Therefore, the overall structure of the plastic product forming device is relatively simple, the coupling degree between molds is reduced, the overall mold quantity is reduced, and the equipment cost is reduced.

Description

Technical Field

[0001] This invention relates to the field of plastic product molding technology, and more specifically, to a plastic product molding apparatus and a plastic product molding method. Background Technology

[0002] BFS (Blow / Fill / Seal) equipment, as a sterile preparation filling equipment, plays an important role in the field of plastic product molding technology. BFS equipment integrates bottle making, filling and sealing into one step, and is also called "three-in-one" equipment.

[0003] In related technologies, multi-mold continuous BFS equipment is used to achieve continuous molding of plastic bottles. However, multi-mold continuous BFS equipment uses multiple sets of molds (e.g., more than 14 sets of molds) to form a ring-shaped closed mold chain. The molding and sealing process of the bottle is achieved by rotating and matching the mold chain.

[0004] However, the method of pairing and closing molds by rotating the mold chain is similar to the principle of gear meshing. The coupling between the molds is relatively strong, and multiple sets of molds are required to work together, which makes the equipment cost very high. When it is necessary to change the size of the plastic bottle, multiple sets of molds that form a chain need to be replaced at the same time, which further increases the equipment cost.

[0005] Therefore, how to reduce the coupling between molds and lower equipment costs is a problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the purpose of the present invention is to provide a plastic product molding apparatus that can reduce the coupling between molds and reduce equipment costs.

[0007] Another object of the present invention is to provide a method for molding plastic articles including the above-described plastic article molding apparatus.

[0008] To achieve the above objectives, the present invention provides the following technical solution:

[0009] A plastic product molding apparatus, comprising:

[0010] A first mold assembly and a second mold assembly are arranged vertically. Each of the first mold assembly and the second mold assembly includes at least one mold. Each mold includes a plastic product body cavity and a plastic product head cavity located below the plastic product body cavity.

[0011] The first mold assembly and the second mold assembly are configured to alternately change positions in a vertical direction to form a continuous chain of plastic products.

[0012] Optionally, the first mold assembly and the second mold assembly are configured as follows:

[0013] When the first mold assembly and the second mold assembly change positions, the upper mold assembly moves down, and the lower mold assembly opens to the first open state and moves up, so that the upper mold assembly can pass through the interior of the lower mold assembly.

[0014] Optionally, when both the first mold assembly and the second mold assembly include at least two molds, the first mold assembly and the second mold assembly are configured as follows:

[0015] All the molds in the upper mold assembly are sequentially molded into plastic products in an upward order; and by moving the upper mold assembly downward as a whole, all the molds in the upper mold assembly are molded in the same vertical position.

[0016] Optionally, both the first mold assembly and the second mold assembly include two molds, which are arranged in a staggered sequence. Among the two molds belonging to the same mold assembly, the upper mold is a forming mold, and the lower mold is a punching mold.

[0017] Optionally, each mold is connected to an independent drive device, which is used to drive the corresponding mold to perform independent mold closing or opening actions.

[0018] Optionally, the mold is detachably connected to the corresponding drive device, and each mold is a series of molds with different heights in the vertical direction, so as to replace the corresponding mold according to the height specifications of the plastic product.

[0019] Optionally, it also includes:

[0020] A clamping device, located below the first mold assembly and the second mold assembly, is used to clamp the plastic product chain when either of the molds is opened to disengage the plastic product chain, and to release the plastic product chain after demolding.

[0021] Optionally, each of the molds includes a positioning cavity for forming a positioning part, which is used to position the plastic product chain.

[0022] A method for molding plastic products, applied to the aforementioned plastic product molding apparatus, the method comprising:

[0023] When the hot melt preform reaches the upper mold assembly of the first mold assembly and the second mold assembly of the plastic product molding device, the mold of the upper mold assembly is controlled to close.

[0024] The first mold assembly and the second mold assembly are controlled to alternately change positions.

[0025] Optionally, controlling the mold closing of the mold assembly located above includes:

[0026] When the hot melt preform reaches the bottom of the mold at the bottom of the upper mold assembly in the first mold assembly and the second mold assembly, the lower mold of the upper mold assembly is controlled to close, forming the body of the plastic product;

[0027] The filling system begins to fill the plastic article formed by the mold at the bottom of the upper mold assembly;

[0028] After the filling system finishes filling, from bottom to top, all the molds in the upper mold assembly are closed and filled accordingly.

[0029] Controlling the alternating position changes of the first mold assembly and the second mold assembly includes:

[0030] During the process of sequentially closing and filling all the molds of the upper mold assembly from bottom to top, the molds of the lower mold assembly in the first mold assembly and the second mold assembly are controlled to open, and the lower mold assembly is controlled to move upward as a whole, while the upper mold assembly is controlled to move downward as a whole, so that the molds of the upper mold assembly are closed in the same vertical position until the bottom of the lowest mold of the lower mold assembly and the top of the highest mold of the upper mold assembly reach a preset mating distance.

[0031] The plastic product molding apparatus provided by this invention has the following beneficial effects:

[0032] By alternating the positions of the first mold assembly and the second mold assembly, continuous production of plastic products can be achieved. Compared with related technologies, it is not necessary to use multiple sets of molds to form a closed ring mold chain, nor is it necessary to achieve mold pairing and mold closing through the rotation of the entire closed ring mold chain. This makes the overall structure of the plastic product molding device relatively simple, reduces the coupling degree between molds, and helps to reduce the overall number of molds and lower equipment costs.

[0033] Furthermore, during the exchange of positions between the first mold assembly and the second mold assembly, the downward movement of the upper mold assembly can drive the entire product chain of the molded plastic products downward. Therefore, compared with related technologies, the mold in this embodiment of the invention eliminates the clamping device. This makes the relative positional relationship between the body cavity and the head cavity of the plastic product on a single mold determine the distance between two adjacent plastic products formed in the vertical direction. Therefore, by reducing the distance between the body cavity and the head cavity of the plastic product on a single mold, waste can be reduced and the utilization rate of packaging materials can be improved.

[0034] The plastic product molding method provided by the present invention, when applied to a plastic product molding apparatus, has at least the beneficial effects of the aforementioned plastic product molding apparatus. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0036] Figure 1 This is a schematic diagram of the structure of the first mold assembly and the second mold assembly of the plastic product molding device in the initial stage.

[0037] Figure 2 for Figure 1 Side view.

[0038] Figure 3 This is a schematic diagram showing the structure of the hot-melt preform reaching the bottom of the second mold layer.

[0039] Figure 4 This is a schematic diagram of the structure where the second mold layer is closed, the first mold assembly moves downward as a whole, the second mold assembly opens, and the second mold assembly moves upward as a whole.

[0040] Figure 5 This is a schematic diagram of the first layer of mold assembly.

[0041] Figure 6 This is a schematic diagram of the structure when the fourth layer mold is moved up to a predetermined distance from the top of the first layer mold.

[0042] Figure 7 This is a schematic diagram of the fourth layer mold when it is closed.

[0043] Figure 8 This is a schematic diagram showing the structure in which the second mold assembly moves downward as a whole, the first mold assembly opens, and the first mold assembly moves upward as a whole.

[0044] Figure 9 This is a schematic diagram of the third layer mold closing structure.

[0045] Figure 10 This is a flowchart of a plastic product molding method provided in a specific embodiment of the present invention.

[0046] Figure label:

[0047] 1-First mold assembly; 11-First layer mold; 12-Second layer mold; 111-Body cavity of plastic product; 112-Head cavity of plastic product; 113-Positioning cavity; 2-Second mold assembly; 21-Third layer mold; 22-Fourth layer mold; 3-Extrusion device; 31-Hot melt tube preform; 4-Filling tube; A-Direction of movement of hot melt tube preform; B-Direction of movement of first mold assembly; C-Direction of movement of second mold assembly. Detailed Implementation

[0048] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0049] The core of this invention is to provide a plastic product molding apparatus that reduces the coupling between molds and lowers equipment costs. Another core aspect of this invention is to provide a plastic product molding method applied to the aforementioned plastic product molding apparatus.

[0050] Please refer to Figures 1 to 9 This invention provides a plastic product molding apparatus, including a first mold assembly 1 and a second mold assembly 2 arranged in a vertical direction. Both the first mold assembly 1 and the second mold assembly 2 include at least one mold. Each mold includes a plastic product body cavity 111 and a plastic product head cavity 112 located below the plastic product body cavity 111. The first mold assembly 1 and the second mold assembly 2 are configured to alternately change positions in a vertical direction to form a continuous plastic product chain.

[0051] It should be noted that in the embodiments of the present invention, all molds have the same structure. The mold located at the top in the vertical direction can be closed to seal the plastic product formed by the adjacent lower mold, and at the same time form a new plastic product body.

[0052] When the initial position is defined, the first mold assembly 1 is located above the second mold assembly 2. When the hot melt preform reaches the first mold assembly 1, the mold of the first mold assembly 1 closes to form the first batch of plastic products. By changing the positions of the first mold assembly 1 and the second mold assembly 2, the second mold assembly 2 is positioned above the first mold assembly 1. During the process of changing the positions of the first mold assembly 1 and the second mold assembly 2, the first mold assembly 1 moves the molded plastic products downward until the second mold assembly 2 is positioned above the first mold assembly 1. At this time, the mold of the second mold assembly 2 closes to form new plastic products. By continuously changing the positions of the first mold assembly 1 and the second mold assembly 2, and by continuously closing the mold of the upper mold assembly in the first mold assembly 1 and the second mold assembly 2, continuous production of plastic products is achieved, forming a plastic product chain.

[0053] Therefore, the embodiments of the present invention achieve continuous production of plastic products by alternating the positions of the first mold assembly 1 and the second mold assembly 2. Compared with related technologies, it is not necessary to use multiple sets of molds to form a closed ring mold chain, nor is it necessary to achieve mold pairing and mold closing through the rotation of the entire closed ring mold chain. This makes the overall structure of the plastic product molding device relatively simple, reduces the coupling degree between molds, and helps to reduce the overall number of molds and lower equipment costs.

[0054] Furthermore, during the exchange of positions between the first mold assembly 1 and the second mold assembly 2, the downward movement of the upper mold assembly can drive the entire product chain of the molded plastic products to move downward. Therefore, compared with related technologies, the mold in this embodiment of the invention eliminates the blank clamping device. This makes the relative positional relationship between the body cavity 111 and the head cavity 112 of the plastic product on a single mold determine the distance between two adjacent plastic products formed in the vertical direction. Therefore, by reducing the distance between the body cavity 111 and the head cavity 112 of the plastic product on a single mold, waste can be reduced and the utilization rate of packaging materials can be improved.

[0055] It should be noted that this embodiment does not limit the specific method of changing the position of the first mold assembly 1 and the second mold assembly 2, as long as the first mold assembly 1 and the second mold assembly 2 can be alternately changed in position.

[0056] In some embodiments, the first mold assembly 1 and the second mold assembly 2 are configured such that when the first mold assembly 1 and the second mold assembly 2 change positions, the upper mold assembly moves down, and the lower mold assembly opens to a first open state and moves up, so that the upper mold assembly can pass through the interior of the lower mold assembly.

[0057] In other words, when the first mold assembly 1 and the second mold assembly 2 change positions, the lower mold assembly opens to a sufficient degree to make way for the upper mold assembly, so that the upper mold assembly can pass through the interior of each mold of the lower mold assembly, thereby realizing the interchange of the first mold assembly 1 and the second mold assembly 2.

[0058] In addition, in some embodiments, the first mold assembly 1 and the second mold assembly 2 are configured to be openable to a second open state. In the initial state, each mold of the first mold assembly 1 and the second mold assembly 2 is in the second open state so that the hot melt preform can reach the first plastic product forming position through each mold.

[0059] Furthermore, in some embodiments, when both the first mold assembly 1 and the second mold assembly 2 include at least two molds, the first mold assembly 1 and the second mold assembly 2 are configured such that all the molds in the upper mold assembly are sequentially molded into plastic products in an upward order; and by moving the upper mold assembly downward as a whole, all the molds in the upper mold assembly are molded in the same vertical position.

[0060] In other words, during the process of closing the molds in the upper mold assembly in a bottom-up order, the upper mold assembly moves down synchronously as a whole, so that each mold can close in the same vertical position. This facilitates precise control of the mold closing position and also allows for the replacement of the positions of the first mold assembly 1 and the second mold assembly 2 during the mold closing process of the upper mold assembly, thereby improving production efficiency.

[0061] In some embodiments, the first mold assembly 1 and the second mold assembly 2 each include two molds, and the molds of the first mold assembly 1 and the second mold assembly 2 are arranged in a cross-order sequence. Among the two molds belonging to the same mold assembly, the upper mold is the forming mold and the lower mold is the punching mold.

[0062] Taking an example where the first mold assembly 1 is on top and the second mold assembly 2 is below, the two molds of the first mold assembly 1 are defined as the first layer mold 11 and the second layer mold 12, and the two molds of the second mold assembly 2 are defined as the third layer mold 21 and the fourth layer mold 22. The staggered arrangement of the molds of the first mold assembly 1 and the second mold assembly 2 means that the first layer mold 11, the third layer mold 21, the second layer mold 12, and the fourth layer mold 22 are arranged sequentially from top to bottom. The first layer mold 11 and the third layer mold 21 are forming molds, and the second layer mold 12 and the fourth layer mold 22 are punching molds. The punching mold of the first mold assembly 1 (such as the second layer mold 12) is used to punch off the plastic product formed by the forming mold of the second mold assembly 2 (such as the third layer mold 21), and the punching mold of the second mold assembly 2 (such as the fourth layer mold 22) is used to punch off the plastic product formed by the forming mold of the first mold assembly 1 (such as the first layer mold 11). That is to say, in this embodiment, while the first mold assembly 1 and the second mold assembly 2 are alternating in position, the formed plastic product can be punched off.

[0063] In addition, in some embodiments, each mold is connected to an independent drive device, which is used to drive the corresponding mold to perform independent mold closing or opening actions.

[0064] Understandably, in related technologies, more than 14 sets of molds are used to form a closed ring mold chain. The molds are paired and closed by rotating the entire closed ring mold chain. Since its principle is similar to the principle of gear rotation and meshing, more than 14 sets of molds and their related structures such as drives form a unique and definite relationship. The height of a single mold is a fixed dimension. Therefore, when the specifications of plastic products change, it is necessary to replace more than 14 sets of molds at the same time, and it is also necessary to ensure that the height of the replaced molds remains unchanged. In this way, the packaging material utilization rate of a single specification product can only be maximized on the same equipment.

[0065] In this embodiment, since each mold is driven to open and close independently, the linkage between molds is decoupled. That is, changes in the height of the mold will not cause mismatch in the overall structure. Therefore, the size of the mold can be freely designed according to the height specifications of plastic products, which is conducive to maximizing the utilization rate of each specification of material on the same equipment.

[0066] Furthermore, in some embodiments, the mold is detachably connected to the corresponding drive device, and each mold is a series of molds with different heights in the vertical direction, so as to replace the corresponding mold according to the height specifications of the plastic product.

[0067] In other words, this embodiment allows for the replacement of molds of different heights to maximize the utilization rate of packaging materials for each specification of plastic product.

[0068] In addition, in some embodiments, the plastic product molding apparatus further includes a clamping device located below the first mold assembly 1 and the second mold assembly 2, for clamping the plastic product chain when either mold is opened to disengage the plastic product chain, and releasing the plastic product chain after demolding.

[0069] In other words, this embodiment provides a clamping device below the bottommost mold assembly to clamp the already formed product chain when the product is demolded. This facilitates the removal of the plastic product from the mold, makes mold demolding easier, and prevents the product chain from shaking back and forth during demolding, which would make demolding difficult.

[0070] In some embodiments, each mold includes a positioning cavity 113 for forming a positioning part, which is used to position the plastic product chain.

[0071] It is understandable that the positioning cavity 113 can be used to form a positioning part on the plastic product. This positioning part can be used to position the product chain of the plastic product. For example, in the punching process, the positioning part is used to position the product chain of the plastic product to facilitate the positioning of the punching reference and ensure accurate punching of the product chain of the plastic product.

[0072] Please refer to Figure 10 In addition to the aforementioned plastic product molding apparatus, this embodiment of the invention also provides a plastic product molding method, applied to the plastic product molding apparatus disclosed in the above embodiments, the plastic product molding method comprising:

[0073] S1: When the hot melt preform reaches the upper mold assembly in the first mold assembly 1 and the second mold assembly 2 of the plastic product molding device, control the mold closing of the upper mold assembly;

[0074] S2: Control the first mold assembly 1 and the second mold assembly 2 to alternately change positions.

[0075] In other words, this embodiment achieves continuous production of plastic products and forms a plastic product chain by continuously alternating the positions of the first mold assembly 1 and the second mold assembly 2, and by continuously closing the upper mold assembly of the first mold assembly 1 and the second mold assembly 2. This plastic product molding method includes at least the beneficial effects of the aforementioned plastic product molding apparatus, which will not be elaborated further here.

[0076] Furthermore, in some embodiments, controlling the mold closing of the mold assembly located above includes:

[0077] When the hot melt preform reaches the bottom of the bottom mold of the upper mold assembly in the first mold assembly 1 and the second mold assembly 2, the bottom mold of the upper mold assembly is closed to form the body of the plastic product.

[0078] The filling system begins filling the plastic product molded at the bottom of the mold assembly located above;

[0079] After the filling system finishes filling, from bottom to top, all the molds in the upper mold assembly are closed and filled accordingly.

[0080] Controlling the alternating position changes of the first mold assembly 1 and the second mold assembly 2 includes:

[0081] During the process of closing and filling all the molds of the upper mold assembly from bottom to top, the molds of the lower mold assembly in the first mold assembly 1 and the second mold assembly 2 are opened, and the lower mold assembly is moved upward as a whole, while the upper mold assembly is moved downward as a whole, so that the molds of the upper mold assembly are closed in the same vertical position until the bottom of the bottom mold of the lower mold assembly and the top of the top mold of the upper mold assembly reach a preset mating distance.

[0082] For example, the description will be given with the first mold assembly 1 on top and the second mold assembly 2 on the bottom:

[0083] The molding method for this plastic product includes:

[0084] When the hot melt preform reaches the bottom of the lowest mold of the first mold assembly 1 (e.g.) Figure 3 As shown), the bottom mold of the first mold assembly 1 closes, molding the body of the plastic product (such as...). Figure 4 (as shown)

[0085] The filling system begins filling the plastic product formed by the mold at the bottom of the first mold assembly 1;

[0086] After the filling system finishes filling the plastic product formed by the bottom mold of the first mold assembly 1, it sequentially closes and fills all the molds of the first mold assembly 1 from bottom to top, such as... Figure 5 As shown;

[0087] When the filling system begins filling the plastic product formed by the bottom mold of the first mold assembly 1, the molds of the second mold assembly 2 open, the first mold assembly 1 moves downward as a whole, and the second mold assembly 2 moves upward as a whole, such as... Figure 5 As shown;

[0088] When the plastic product formed by the uppermost mold of the first mold assembly 1 is filled, and the bottom of the lowermost mold of the second mold assembly 2 reaches a preset mating distance with the top of the uppermost mold of the first mold assembly 1 (e.g. Figure 6 As shown), the bottom mold assembly of the second mold component 2 (as shown) Figure 7 As shown), the filling system begins to fill the plastic product formed by the mold at the bottom of the second mold assembly 2;

[0089] After the filling system finishes filling the plastic product formed by the bottom mold of the second mold assembly 2, it sequentially closes and fills all the molds of the second mold assembly 2 from bottom to top, such as... Figure 8 and Figure 9 As shown; this process is repeated until the production of the plastic product is complete.

[0090] It is understandable that before the hot melt preform reaches the bottom of the mold at the bottom of the first mold assembly 1, there is a tube blank discharge process, that is, the hot melt tube blank 31 is extruded by the extrusion device 3. The extrusion device 3 is equipped with a filling tube 4, which extends into the hot melt tube blank 31 to fill the molded plastic product. In addition, it is understandable that when the mold is closed and the body of the plastic product is formed, the hot melt preform is attached to the body cavity 111 of the plastic product under the action of vacuum and air blowing.

[0091] Additionally, it should be noted that since each mold includes a plastic product body cavity 111 and a plastic product head cavity 112, and the plastic product head cavity 112 is located below the plastic product body cavity 111, when the bottom mold of the first mold assembly 1 closes to form the body of the plastic product and after filling is completed, if the first mold assembly 1 includes at least two molds, when the bottom mold of the first mold assembly 1 closes to the top mold, it not only seals the plastic product formed by the bottom mold of the first mold assembly 1, but also forms the body of another plastic product; when the plastic product formed by the top mold of the first mold assembly 1 is filled, and the bottom of the bottom mold of the second mold assembly 2 reaches a preset mating distance with the top of the top mold of the first mold assembly 1, the bottom mold of the second mold assembly 2 closes to seal the plastic product formed by the top mold of the first mold assembly 1, and also forms the body of the next plastic product. That is, one mold (which can be called the target mold for convenience) is used to form the body of the plastic product, and another mold (located immediately above and next to the target mold) is used to seal the plastic product. In this way, the molds close sequentially from bottom to top, and the interaction between the first mold assembly 1 and the second mold assembly 2 enables continuous production of plastic products. It should be noted that, as... Figure 2As shown, along the horizontal direction, the mold can have multiple plastic product body cavities 111 and multiple plastic product head cavities 112 to simultaneously mold multiple plastic products.

[0092] Please refer to Figures 1-9 The following describes the working process of a plastic product molding device comprising two sets of mold assemblies, each set containing two molds, as an example. One set of mold assemblies is the first mold assembly 1, and the other is the second mold assembly 2. The two molds of the first mold assembly 1 are arranged sequentially, and the two molds of the second mold assembly 2 are arranged sequentially. The first mold assembly 1 is located above the second mold assembly 2. For ease of description, the upper mold of the first mold assembly 1 is referred to as the first layer mold 11, the lower mold of the first mold assembly 1 is referred to as the second layer mold 12, the upper mold of the second mold assembly 2 is referred to as the third layer mold 21, and the lower mold of the second mold assembly 2 is referred to as the fourth layer mold 22. The first layer mold 11, the second layer mold 12, the third layer mold 21, and the fourth layer mold 22 are arranged sequentially from top to bottom. The plastic product molding process is as follows:

[0093] (1) Tube blank discharge: The extrusion device 3 extrudes the hot melt tube blank 31, and the filling tube 4 is inserted into the extrusion device 3. The filling tube 4 extends into the hot melt tube blank 31.

[0094] (2) Bottle body forming and filling: When the hot melt preform extruded by the extrusion device 3 reaches the bottom position of the second layer mold 12, the second layer mold 12 closes, and the preform of the plastic product body cavity 111 is attached under the action of vacuum and air blowing, forming the body part of the first batch of plastic products. The filling system starts filling, and at the same time, the second mold assembly 2 opens, and the first mold assembly 1 moves downward under the action of driving force.

[0095] (3) Sealing of the first batch of plastic products: When the filling is finished, the first mold 11 closes, which not only seals the first batch of plastic products, but also forms the body of the second batch of plastic products. Then the filling is started, and at the same time the second mold assembly 2 moves upward and the first mold assembly 1 moves downward.

[0096] (4) Sealing the second batch of plastic products: When the filling is finished and the bottom of the fourth layer mold 22, which moves upward, reaches the mating distance with the top of the first layer mold 11, the fourth layer mold 22 closes, thus sealing the second batch of plastic products and forming the body of the third batch of plastic products. Filling is then started, and at the same time, the first mold assembly 1 opens and the second mold assembly 2 moves downward.

[0097] (5) Sealing of the third batch of plastic products: When the filling is finished, the third layer mold 21 closes, which realizes the sealing of the third batch of plastic products and forms the body of the fourth batch of plastic products. The filling is opened, and the first set of components moves upward.

[0098] (6) Sealing the fourth batch of plastic products: When the filling is finished and the bottom of the second layer mold 12 that moves upward reaches the mating distance with the top of the third layer mold 21, the action of step (2) is repeated to achieve sealing of the fourth batch of plastic products.

[0099] (7) Product chain formation: Repeat steps (2) to (6) to form a cycle and realize continuous production of plastic products.

[0100] In addition, in some embodiments, when both the first mold assembly 1 and the second mold assembly 2 include two molds, and the molds of the first mold assembly 1 and the second mold assembly 2 are arranged alternately, with the upper mold being the forming mold and the lower mold being the punching mold, the two molds of the first mold assembly 1 are respectively the first layer mold 11 and the second layer mold 12, and the two molds of the second mold assembly 2 are respectively the third layer mold 21 and the fourth layer mold 22. The plastic product molding method further includes:

[0101] When the hot melt preform reaches the first mold 11, the first mold 11 closes to form the body of the plastic product;

[0102] The filling system begins filling the plastic products formed by the first mold 11;

[0103] When the filling system begins to fill the plastic product formed by the first mold 11, the second mold assembly 2 opens, the first mold assembly 1 moves downward as a whole, and the second mold assembly 2 moves upward as a whole.

[0104] When the filling system finishes filling the plastic product formed by the first mold 11, and the bottom of the third mold 21 and the top of the first mold 11 reach the preset mating distance, the third mold 21 closes, and the filling system begins to fill the plastic product formed by the third mold 21.

[0105] When the filling system begins to fill the plastic product formed by the third mold 21, the first mold assembly 1 opens, the second mold assembly 2 moves downward as a whole, and the first mold assembly 1 moves upward as a whole.

[0106] When the filling system finishes filling the plastic product formed by the third mold 21, and the bottom of the first mold 11 and the top of the third mold 21 reach the preset mating distance, the first mold 11 closes, and the filling system begins to fill the plastic product formed by the first mold 11.

[0107] This cycle repeats;

[0108] During this cycle, the fourth mold 22 and the third mold 21 close simultaneously to punch the plastic product formed by the first mold 11; the second mold 12 and the first mold 11 close simultaneously to punch the plastic product formed by the third mold 21.

[0109] It should also be noted that, in this specification, relational terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations.

[0110] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0111] The above provides a detailed description of the plastic product molding method and apparatus provided by the present invention. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the present invention.

Claims

1. A plastic article forming apparatus characterized by comprising: The application relates to a vertical injection molding machine for molding a plastic product chain, comprising: a first mold assembly (1) and a second mold assembly (2) arranged vertically, each of the first mold assembly (1) and the second mold assembly (2) comprising at least two molds, each of the molds comprising a plastic product body cavity (111) and a plastic product head cavity (112) below the plastic product body cavity (111); the first mold assembly (1) and the second mold assembly (2) are configured to be alternately replaced in the vertical direction to mold a continuous plastic product chain; when the first mold assembly (1) and the second mold assembly (2) each comprise at least two molds, the first mold assembly (1) and the second mold assembly (2) are configured such that all the molds in the upper mold assembly among the two are sequentially closed to mold the plastic product in the order from bottom to top, and all the molds in the upper mold assembly are closed at the same vertical position by moving the upper mold assembly as a whole; or, when the first mold assembly (1) and the second mold assembly (2) each comprise two molds, the two molds of the first mold assembly (1) are a first layer mold (11) and a second layer mold (12) respectively, the two molds of the second mold assembly (2) are a third layer mold (21) and a fourth layer mold (22) respectively, the first layer mold (11), the third layer mold (21), the second layer mold (12) and the fourth layer mold (22) are sequentially arranged from top to bottom, the first layer mold (11) and the third layer mold (21) are forming molds respectively, the second layer mold (12) and the fourth layer mold (22) are punching molds respectively, the second layer mold (12) is used for punching down the plastic product molded by the third layer mold (21), and the fourth layer mold (22) is used for punching down the plastic product molded by the first layer mold (11).

2. The plastic article forming apparatus according to claim 1, wherein the first mold assembly (1) and the second mold assembly (2) are configured to: when the first mold assembly (1) and the second mold assembly (2) are replaced, the upper mold assembly among the two is moved downward, the lower mold assembly among the two is opened to a first open state and is moved upward, and the upper mold assembly can pass through the inside of the lower mold assembly.

3. The plastic article molding apparatus according to claim 1 or 2, wherein each of the molds is connected with an independent driving device, and the driving device is used for driving the corresponding mold to independently perform a closing or opening action.

4. The plastic article molding apparatus according to claim 3, wherein the molds and the corresponding driving devices are detachably connected, each of the molds is a series of molds with different heights in the vertical direction, and the corresponding mold can be replaced according to the height specification of the plastic product.

5. The plastic article molding apparatus according to claim 1 or 2, wherein the application further comprises: a clamp device arranged below the first mold assembly (1) and the second mold assembly (2), used for clamping the plastic product chain when any of the molds is opened to separate the plastic product chain, and releasing the plastic product chain after demolding.

6. The plastic article molding apparatus according to claim 1 or 2, wherein Each of the molds comprises a positioning cavity (113) for forming a positioning part for positioning the product chain of the plastic product.

7. A method of forming a plastic article, characterized by, The plastic product forming method is applied to the plastic product forming device according to any one of claims 1-6, and the plastic product forming method comprises: controlling the mold closing of the upper mold assembly when the hot melt parison reaches the upper mold assembly of the first mold assembly (1) and the second mold assembly (2) of the plastic product forming device; controlling the first mold assembly (1) and the second mold assembly (2) to alternately change positions.

8. The plastic article molding method according to claim 7, wherein controlling the mold closing of the upper mold assembly comprises: controlling the mold closing of the lowermost mold of the upper mold assembly when the hot melt parison reaches the bottom of the lowermost mold of the upper mold assembly, forming the body part of the plastic product; the filling system starts filling the plastic product formed by the lowermost mold of the upper mold assembly; after the filling system finishes filling, sequentially closing the molds and corresponding filling from bottom to top for all the molds of the upper mold assembly; controlling the first mold assembly (1) and the second mold assembly (2) to alternately change positions comprises: during the process of sequentially closing the molds and corresponding filling from bottom to top for all the molds of the upper mold assembly, controlling the opening of each mold of the lower mold assembly of the first mold assembly (1) and the second mold assembly (2), controlling the upward movement of the lower mold assembly as a whole, and controlling the downward movement of the upper mold assembly as a whole, so that each mold of the upper mold assembly is closed at the same vertical position, until the bottom of the lowermost mold of the lower mold assembly and the top of the uppermost mold of the upper mold assembly reach a preset matching distance.

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