CN116945555A - Plastic uptake tray forming die with defoaming structure - Google Patents

Abstract

The invention discloses a plastic sucking tray forming die with a defoaming structure, which comprises a die shell, wherein a plastic sucking unit is arranged in the die shell, the die shell is provided with a plurality of temperature changing devices, the plastic sucking unit and an annular groove are respectively provided with a plurality of sucking holes with different apertures, the sucking holes are subjected to aperture customization according to the volume of a cavity right above the plastic sucking unit, the aperture size is in direct proportion to the volume of the cavity, a pipeline matched with the sucking holes is arranged in the die shell, an insulating layer is sleeved outside the pipeline, and a flow velocity detection device is arranged on a branch pipe. According to the suction holes with different apertures, which are custom designed according to the corresponding accommodating cavities, the synchronous vacuumizing of each accommodating cavity can be realized, the generation of air storage dead angles and the local position deviation of the plastic sucking sheet are avoided, no air bubble and the structural strength of the tray in the forming tray are ensured, and the air bubble is avoided in the forming tray by preheating and heat preservation of the plastic sucking sheet during plastic sucking, uniform cooling and temperature reduction of the plastic sucking sheet after plastic sucking, pipeline heat preservation and detection of different position flow rates, the blockage of an air suction pipeline is slowed down, and the blockage position is convenient to determine.

Description

Plastic uptake tray forming die with defoaming structure

Technical Field

The invention relates to the technical field of plastic suction molds, in particular to a plastic suction tray forming mold with a defoaming structure.

Background

Plastic uptake is used as the main technology for plastic processing, and the main principle is that after a flat plastic hard sheet is heated and softened, the plastic hard sheet is adsorbed on the surface of a mould by vacuum and is cooled and molded, so that the plastic uptake is widely used in the industries of plastic packaging, lamp decoration, advertisement, decoration and the like. The plastic suction package has the main advantages of raw material saving, light weight, convenient transportation and good sealing performance; any special-shaped product can be packaged, and no buffer material is needed for boxing; the packaged product is transparent and visible, has attractive appearance, is convenient for sale, is suitable for mechanized and automatic packaging, is convenient for modern management, saves manpower and improves efficiency.

At present, the following problems exist in a plastic tray forming die:

1. the holes used for creating vacuum conditions on the mold are same in aperture and uneven in distribution, and the mold and the plastic sucking sheet cannot be subjected to synchronous vacuumizing corresponding to the cavity, so that air storage dead angles exist in the cavity, bubbles are generated in the molded tray, the vacuum sucking sheet is asynchronous in vacuumizing, the plastic sucking sheet is locally stretched and deformed in advance, the plastic sucking sheet is locally position-deviated, and the thickness of the finished tray at the protruding part of the mold is far lower than a theoretical design value, so that the structural strength of the tray is greatly reduced.

2. During plastic suction, the heated plastic suction sheet is naturally cooled, so that the temperature is too low to influence the plasticity of the plastic suction sheet, the vacuum degree in a die during plastic suction and the generation of bubbles in a tray after plastic suction; after the plastic suction, the plastic suction sheet is cooled unevenly, and bubbles in the forming tray can be generated.

3. The high-temperature gas cooling that contains plastic uptake piece residue and dust in the pipeline of bleeding is attached to the pipeline inner wall, and leads to pumping efficiency decline and unstable, easily leads to holding intracavity air to remain for exist the bubble in the shaping tray, and to this blockage department position determination also comparatively difficult, the mediation clearance is inconvenient, influences tray shaping efficiency, effect greatly.

Disclosure of Invention

The invention aims at: in order to solve the problems that the suction holes of the plastic sucking tray forming die are same in aperture and uneven in distribution, synchronous vacuumizing of corresponding cavities between the die and the plastic sucking sheets cannot be realized, air storage dead angles and local position deviations of the plastic sucking sheets exist in the cavities, air bubbles exist in the forming tray and structural strength of the tray is reduced, natural cooling temperature of the plastic sucking sheets is too low during plastic sucking, cooling temperature of the plastic sucking sheets is uneven after plastic sucking, high-temperature air of residues and dust of the plastic sucking sheets is cooled and attached to the inner wall of a pipeline, an air suction pipeline is blocked, air suction efficiency is reduced unstably, blocking positions are difficult to determine, and air bubbles exist in the forming tray easily, and the plastic sucking tray forming die with a defoaming structure is provided.

In order to achieve the above purpose, the present invention adopts the following technical scheme: the utility model provides a plastic uptake tray forming die with defoaming structure, including the mould shell, set up the plastic uptake unit that a plurality of matrix distributed in the mould shell, set up the ring channel that corresponds with the tray lateral wall in the plastic uptake tray along the edge of a plurality of plastic uptake units, the mould shell sets up a plurality of temperature change devices at the edge of ring channel, all set up the suction port of a plurality of different apertures on plastic uptake unit and the ring channel, the suction port carries out the customization of aperture according to the cavity volume directly over it, aperture size is proportional to cavity volume, set up the pipeline with the suction port is supporting in the mould shell, the pipeline includes branch pipe and is responsible for, branch pipe and person in charge's overcoat are equipped with the heat preservation, set up a plurality of velocity of flow detection device on the branch pipe.

As a further description of the above technical solution:

the plastic sucking unit comprises a first male die, a second male die, a third male die and a female die, wherein the first male die corresponds to a carrying groove on the plastic sucking tray, and the female die corresponds to a protruding block on the plastic sucking tray for assisting in limiting materials.

As a further description of the above technical solution:

the second male die and the third male die are respectively used for connecting the first male dies of the plastic sucking units which are adjacent transversely or longitudinally.

As a further description of the above technical solution:

the edge of the annular groove is provided with a trapezoid protruding block corresponding to the guiding concave edge on the outer wall of the plastic sucking tray.

As a further description of the above technical solution:

the temperature changing devices are uniformly arranged along the peripheral edge of the annular groove at equal intervals.

As a further description of the above technical solution:

the pipeline is connected at the suction end of the vacuum pump through the main pipe, the branch pipe is vertically and fixedly connected with the main pipe, an arc-shaped guide surface is arranged at the joint of the branch pipe and the main pipe, and a suction hole is formed at the upper end of the branch pipe.

As a further description of the above technical solution:

the flow velocity detection devices are equidistantly arranged along the direction of the vertical direction of the branch pipe.

In summary, due to the adoption of the technical scheme, compared with the prior art, the invention has the following beneficial effects:

1. according to the invention, the synchronous vacuumizing of each cavity can be realized according to the pumping holes with different apertures, which are custom designed corresponding to the cavities, so that the plastic sucking sheet is synchronously deformed and molded under the negative pressure of the cavities, air residues caused by air storage dead angles in the cavities are avoided, air bubbles in the tray are avoided, meanwhile, the partial advanced stretching deformation of the plastic sucking sheet caused by asynchronous deformation and molding can be avoided, the partial position deviation of the plastic sucking sheet is avoided, the thickness of the finished tray at the convex part of the die is further caused to be far lower than the theoretical design value, and the structural strength of the tray is greatly reduced.

2. Preheating the die before plastic suction by the temperature changing device, so as to avoid the influence of the excessively low temperature caused by the natural cooling of the heated plastic suction sheet on the plasticity of the plastic suction sheet, the vacuum degree in the die during plastic suction and the generation of bubbles in a tray after plastic suction; after the plastic suction, the plastic suction sheet is uniformly cooled by a temperature changing device, so that the plastic suction sheet is contracted and separated from a die, and finally formed.

3. The pipeline blocking position is determined according to the flow velocity values detected by the flow velocity detection devices at different positions on the branch pipes, the flow velocity value ratio in different branch pipes deviates too much from the theoretical value and the flow velocity in a single branch pipe is suddenly changed, and dredging and cleaning of blocking positions are carried out, so that the normal air suction of a suction system is ensured, the gas residues in a container between a die and a plastic suction sheet during plastic suction are avoided, and residual gas is mixed into the plastic suction sheet, so that bubbles exist in a plastic suction tray and the use is influenced; the heat preservation layers are arranged on the pipelines, so that high-temperature gas with plastic sucking sheet residues and dust can be prevented from being attached to the inner walls of the pipelines when encountering cold, and the normal operation of the air extraction system is further influenced. According to the invention, through the design, the air in the die is completely exhausted, so that the vacuum degree in the die during plastic suction is ensured, the generation of bubbles in the plastic suction tray is avoided, and a good defoaming effect is achieved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a perspective view of a plastic tray molding die with a defoaming structure.

Fig. 2 is a top view of a plastic tray forming mold with a defoaming structure.

Fig. 3 is an enlarged view of a portion a (i.e., a suction unit) in fig. 2.

Fig. 4 is a cross-sectional view of a pipe in a mold housing in a molding mold for a suction tray having a defoaming structure.

Legend description:

1. a mold housing; 2. a plastic sucking unit; 3. a first punch; 4. a second male die; 5. a third male die; 6. a female die; 7. trapezoidal protruding blocks; 8. a main pipe; 9. a branch pipe; 10. a heat preservation layer; 11. a suction hole; 12. a flow rate detection device; 13. a temperature changing device.

Detailed Description

The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.

In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like indicate or are based on the orientation or positional relationship shown in the drawings, merely to facilitate description of the present invention and to simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.

Embodiment one:

referring to fig. 1-4, the present invention provides a technical solution: a plastic sucking tray forming die with a defoaming structure comprises a die shell 1, wherein a plurality of matrix-type plastic sucking units 2 are arranged in the die shell 1, annular grooves corresponding to the side walls of the tray in the plastic sucking tray are arranged along the edges of the plastic sucking units 2, a plurality of temperature changing devices 13 are arranged at the edges of the annular grooves in the die shell 1, the die is preheated before plastic sucking through the temperature changing devices, and the plastic sucking sheets after heating are prevented from being naturally cooled to cause too low temperature to influence the plasticity of the plastic sucking sheets and the vacuum degree in the die and the generation of bubbles in the tray after plastic sucking; after plastic suction, the plastic suction sheet is uniformly cooled and cooled through a temperature changing device, so that the plastic suction sheet is contracted and separated from a die, and finally formed, a plurality of suction holes 11 with different apertures are arranged on a plastic suction unit 2 and an annular groove, the suction holes 11 are customized according to the cavity volume right above the plastic suction unit, the aperture size is in direct proportion to the cavity volume, the synchronous vacuumizing of each cavity can be realized according to the suction holes with different apertures which are customized and designed corresponding to the cavities, the plastic suction sheet can be synchronously deformed and molded under the negative pressure of the cavities, the air storage dead angle existing in the cavities is prevented from causing air residues to cause air bubbles in the tray, meanwhile, the partial premature stretching deformation of the plastic suction sheet caused by the asynchronous deformation and the partial position deviation of the plastic suction sheet are avoided, and the thickness of the finished tray at the convex part of the die is further caused to be far lower than the theoretical design value, the structural strength of the tray is greatly reduced, the pipeline matched with the suction hole 11 is arranged in the die shell 1, the pipeline comprises a branch pipe 9 and a main pipe 8, the branch pipe 9 and the main pipe 8 are sleeved with a heat insulation layer 10, the heat insulation layers are arranged on the pipeline, high-temperature gas with plastic sucking sheet residues and dust can be prevented from adhering to the inner wall of the pipeline when encountering cold, the normal operation of the suction system is further influenced, a plurality of flow rate detection devices 12 are arranged on the branch pipe 9, the flow rate values detected by the flow rate detection devices at different positions on the branch pipe are offset by too much flow rate value proportion and theoretical value in different branches and the flow rate mutation in a single branch pipe, the pipeline blocking position is determined, dredging and cleaning of blocking positions are carried out, so that the suction system is ensured to suck the gas normally, the residual gas in the container between the die and the plastic sucking sheet is prevented from being mixed into the plastic sucking sheet, and bubbles are caused in the plastic sucking tray, affecting use. According to the invention, through the design, the air in the die is completely exhausted, so that the vacuum degree in the die during plastic suction is ensured, the generation of bubbles in the plastic suction tray is avoided, and a good defoaming effect is achieved.

The plastic sucking unit 2 comprises a first male die 3, a second male die 4, a third male die 5 and a female die 6, wherein the first male die 3 corresponds to a carrying groove on the plastic sucking tray, the female die 6 corresponds to a protruding block used for assisting material limiting on the plastic sucking tray, the second male die 4 and the third male die 5 are respectively used for connecting the first male die 3 of the plastic sucking unit 2 which is adjacent transversely or longitudinally, the edge of the annular groove is provided with a trapezoid protruding block 7 corresponding to a guiding concave edge on the outer wall of the plastic sucking tray, and each part of the molded plastic sucking tray is tightly connected and stable in structure.

The pipeline is connected at the suction end of the vacuum pump through being responsible for 8, and branch pipe 9 and be responsible for 8 perpendicular fixed connection, and the junction that branch pipe 9 and be responsible for 8 sets up the arc guide surface, and the upper end of branch pipe 9 sets up suction hole 11 for the pumping efficiency of pumping system is the best and stable.

Embodiment two:

referring to fig. 1, 2 and 4, in the first embodiment, the temperature changing devices 13 are preferably uniformly arranged along the circumferential edge of the annular groove at equal intervals, so that the temperature changing devices preheat the front mold for plastic suction and cool the rear mold for plastic suction and the plastic suction sheet more uniformly and rapidly.

The flow velocity detection device 12 is arranged along the direction equidistant of the vertical direction of the branch pipe 9, so that the blocking condition in the branch pipe can be accurately judged, and the dredging can be timely cleaned, and the stable air extraction of the air extraction system can be ensured.

The operating principle of the plastic uptake tray forming die with the defoaming structure of the embodiment comprises the following steps: when the plastic sucking tray forming die is used, pipeline blockage situation detection is firstly carried out, a vacuum pump is started, the flow speed numerical value detected by a flow speed detection device 12 at different positions on branch pipes 9 is deviated too much from a theoretical value according to the flow speed numerical value proportion in different branch pipes 9, the flow speed mutation in a single branch pipe 9 is determined, the pipeline blockage position is determined, dredging and cleaning of the blockage position are carried out to ensure normal air suction of a sucking system, the residual gas in a container between the die and a plastic sucking sheet is avoided during plastic sucking, residual gas is mixed into the plastic sucking sheet to cause air bubbles in the plastic sucking tray to influence the use, after pipeline blockage situation detection and dredging and cleaning, a plastic sucking process can be started, a temperature changing device 13 is started to preheat the die, the plastic sucking sheet is heated in the upper process, the plastic sucking sheet is prevented from being influenced by the fact that the temperature is too low to cause plasticity of the plastic sucking sheet, the plastic sucking sheet is finally formed and contained in the air bubbles to be not up to standard, the plastic sucking sheet is placed on the die, the vacuum pump is started, the vacuum pump is used for sucking the air in a cavity through sucking hole 11, the plastic sucking system, the plastic sucking layer 10 is arranged in the container between the die and the plastic sucking sheet, residual gas is mixed into the plastic sucking sheet, the plastic sucking sheet is caused to cause the plastic sucking tray to be in the plastic sucking tray, the plastic sucking tray to be deformed due to the partial vacuum cavity, the vacuum deformation is simultaneously, the vacuum forming process is prevented from being carried out at the inner wall is simultaneously to be in the vacuum cavity to be partially deformed due to the different positions, and the vacuum cavity is designed to the vacuum suction hole, and the vacuum suction cavity is prevented from being partially due to the negative air suction cavity is simultaneously to be deformed, and deformed at the inner part, and the vacuum cavity is simultaneously due to the vacuum cavity is simultaneously to the vacuum cavity in the vacuum cavity is designed to be in the vacuum cavity part and different. The structural strength of the tray is greatly reduced, after the plastic suction is completed, the plastic suction sheet can be uniformly cooled through the temperature changing device 13, so that the plastic suction sheet is contracted and separated from the die, and finally formed.

The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should make equivalent substitutions or modifications according to the technical scheme of the present invention and the inventive concept thereof, and should be covered by the scope of the present invention.

Claims (7)

1. The utility model provides a plastic uptake tray forming die with defoaming structure, its characterized in that, including mould shell (1), set up in mould shell (1) a plurality of matrix distribution's plastic uptake unit (2), along a plurality of the edge setting of plastic uptake unit (2) is with the ring channel that tray lateral wall corresponds in the plastic uptake tray, mould shell (1) are in the edge of ring channel sets up a plurality of temperature change device (13), all set up suction opening (11) of a plurality of different apertures on plastic uptake unit (2) and the ring channel, suction opening (11) carry out the customization of aperture according to the cavity volume directly over it, and aperture size is directly proportional with cavity volume, set up in mould shell (1) with the supporting pipeline of suction opening (11), the pipeline includes branch pipe (9) and is responsible for (8), branch pipe (9) and are responsible for (8) overcoat and are equipped with heat preservation (10), set up a plurality of velocity of flow detection device (12) on branch pipe (9).

2. The plastic sucking tray forming die with the defoaming structure according to claim 1, wherein the plastic sucking unit (2) comprises a first male die (3), a second male die (4), a third male die (5) and a female die (6), the first male die (3) corresponds to a carrying groove on the plastic sucking tray, and the female die (6) corresponds to a protruding block on the plastic sucking tray for assisting material limiting.

3. A blister tray forming die with a defoaming structure according to claim 2, characterized in that the second punch (4) and the third punch (5) are respectively used for connecting the first punches (3) of the blister units (2) adjacent in the transverse or longitudinal direction.

4. A blister tray forming die with a defoaming structure according to claim 1, characterized in that the edge of the annular groove is provided with a trapezoidal protruding block (7) corresponding to the guiding concave edge on the outer wall of the blister tray.

5. A blister tray forming die with a defoaming structure according to claim 1, characterized in that the temperature changing means (13) are equally spaced along the circumferential edge of the annular groove.

6. The plastic sucking tray forming die with the defoaming structure according to claim 1, wherein the pipeline is connected to a sucking end of a vacuum pump through the main pipe (8), the branch pipe (9) is fixedly connected with the main pipe (8) vertically, an arc-shaped flow guide surface is arranged at the joint of the branch pipe (9) and the main pipe (8), and the sucking hole (11) is formed in the upper end of the branch pipe (9).

7. A blister tray forming die with a defoaming structure according to claim 1, characterized in that the flow rate detection means (12) are equidistantly arranged along the vertical direction of the branch pipe (9).