WO2019214525A1 - Dispositif de thermoformage - Google Patents

Dispositif de thermoformage Download PDF

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Publication number
WO2019214525A1
WO2019214525A1 PCT/CN2019/085407 CN2019085407W WO2019214525A1 WO 2019214525 A1 WO2019214525 A1 WO 2019214525A1 CN 2019085407 W CN2019085407 W CN 2019085407W WO 2019214525 A1 WO2019214525 A1 WO 2019214525A1
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WO
WIPO (PCT)
Prior art keywords
deformed
molding
forming
thermoforming
region
Prior art date
Application number
PCT/CN2019/085407
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English (en)
Chinese (zh)
Inventor
周俊超
Original Assignee
嘉兴优逸客智能家居有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from CN201910129800.6A external-priority patent/CN110450392A/zh
Application filed by 嘉兴优逸客智能家居有限公司 filed Critical 嘉兴优逸客智能家居有限公司
Publication of WO2019214525A1 publication Critical patent/WO2019214525A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/08—Deep drawing or matched-mould forming, i.e. using mechanical means only
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/10—Forming by pressure difference, e.g. vacuum
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C51/00—Shaping by thermoforming, i.e. shaping sheets or sheet like preforms after heating, e.g. shaping sheets in matched moulds or by deep-drawing; Apparatus therefor
    • B29C51/26—Component parts, details or accessories; Auxiliary operations
    • B29C51/28—Component parts, details or accessories; Auxiliary operations for applying pressure through the wall of an inflated bag or diaphragm

Definitions

  • the invention relates to the technical field of thermoforming devices.
  • thermoforming methods of plastic products are mainly divided into extrusion molding, injection molding, blow molding, blown film forming, and tape casting.
  • blown film forming and tape casting are processes for producing plastic films.
  • Both blown film forming and tape casting are processes for producing flat plastic film. It is not possible to directly form a three-dimensional plastic film (barrel film) with a bottom surface; the existing barrel film can only be subjected to secondary hot pressing or Cold pressing will be made of a flat plastic film.
  • Blow molding and injection molding can form a barrel film in one piece, but it has a large thickness, such as pure water and beverage bottles. Its thickness cannot be on the order of blown film or casting.
  • the invention proposes a thermoforming device which can control the deformation of the sheet to be thermoformed by the setting of the elastic coefficient of the elastic carrying pad itself, and finally can form an integrally formed barrel film.
  • thermoforming device comprising a molding die, an elastic carrying pad, a pressing unit, a heating unit, and a compression sealing device;
  • the molding die is provided with a forming gasket ring
  • the elastic carrying pad is tightly combined with the sheet to be thermoformed to form a synchronous assembly;
  • the synchronous assembly is tightly sealed by the compression sealing device and the molded forming ring, and the region to be deformed and the forming ring of the synchronous assembly are Forming the inlet alignment;
  • the pressure output end of the pressurizing unit and the heat output end of the heating unit both output to the region to be deformed of the synchronous assembly, and the pressure provided by the pressurizing unit is deformed toward the body to be deformed toward the body to be deformed.
  • the heating temperature provided by the heating unit is the temperature at which the sheet to be thermoformed to be deformed reaches a softening state; the elastic modulus of the region to be deformed of the elastic carrying mat is set according to the shape and thickness uniformity of the forming target.
  • the forming mold is provided with a molding cavity, and the forming inlet is an inlet of the molding cavity; the sidewall of the molding cavity is matched with the sidewall of the molding target; The bottom is larger than the bottom of the forming target or the bottom of the forming cavity is adapted to the bottom of the forming target.
  • thermoforming device further comprises a cooling unit; the cooling unit is configured to cool the shaped region to be deformed.
  • thermoforming device of the present invention can produce an integrally formed barrel film, which is a pioneering product, and the barrel film itself processed in one piece and integrally formed has no
  • the secondary crimping edge saves the waste of the edge material caused by the secondary crimping, and fills the technical blank of the integrated barrel film production device.
  • the elastic carrying mat used in the thermoforming device belongs to the pioneering part in the plastic thermoforming process; the elastic modulus of different positions is set to regulate the elongation at different positions in the forming process, and the traction control is to be thermoformed.
  • the synchronous movement of the materials enables the set thickness uniformity and shape to be achieved during the deformation process of the elastically formed sheet following the elastic carrying mat. Compared to the plastic forming, the thickness of the sheet at different positions was set and intervened.
  • Figure 1 is a schematic view of the structure of the thermoforming apparatus (the bottom of the forming cavity is anastomosed);
  • FIG. 2 is a schematic view of the structure of the thermoforming apparatus (the bottom of the forming cavity is anastomosed);
  • Figure 3 is a schematic view of the structure of the thermoforming apparatus (without a molding cavity);
  • Figure 4 is a schematic view of a heat radiation heating structure
  • Figure 5 is a schematic view of a heat conduction heating structure
  • Figure 6 is a schematic view of a negative pressure pressurization structure
  • Figure 7 is a schematic view of a positive pressure pressurization structure
  • FIG. 8 is a working principle diagram of the cooling unit
  • FIG. 9 is another working principle diagram of the cooling unit
  • FIG. 10 is a further working principle diagram of the cooling unit
  • Figure 11 is a schematic structural view of a compression sealing device
  • Figure 12 is a schematic view showing another structure of the crimp sealing device
  • a thermoforming apparatus includes a molding die, an elastic carrying pad 3, a pressing unit 4, a heating unit 5, and a compression sealing device 27; the molding die is provided with a forming gasket 2;
  • the elastic carrying mat 3 is in close contact with the sheet 1 to be thermoformed to form a synchronizing assembly 7; the synchronizing assembly 7 is tightly sealed with the forming mat 2 by the compression sealing device 27, and the region to be deformed of the synchronizing assembly 7 is
  • the forming inlet of the forming gasket 2 is aligned; the pressure output end of the pressurizing unit 4 and the heat output end of the heating unit 5 are both outputted to the region to be deformed of the synchronizing assembly 7, and the pressure supplied by the pressurizing unit 4 is directed
  • the pressure of the deformation zone to be deformed into the molding inlet, the heating temperature provided by the heating unit 5 is the temperature at which the sheet to be thermoformed 1 to be deformed reaches a softening state; the elastic modulus of the region to be deformed of the elastic carrier pad 3
  • the molding die is provided with a molding cavity 6, which is the inlet of the molding cavity 6; the sidewall of the molding cavity 6 is adapted to the sidewall of the molding target; the bottom of the molding cavity 6 is larger than the molding target The bottom or the bottom of the forming cavity 6 is adapted to the bottom of the forming target.
  • the function of the molding cavity 6 is to assist the elastic carrying pad 3 in shaping the shape of the molding target (the molding target refers to the barrel film conforming to the preset parameter index), and can limit the elastic carrying pad 3 .
  • the bottom of the molding cavity 6 can be adapted to the bottom of the forming target (after molding), so that the shape can be precisely controlled; as shown in FIG. 2; the bottom of the molding cavity 6 can also be larger than the bottom of the molding target, although after molding It won't match, but the barrel film produced will still work.
  • the embodiment of the present invention is mainly described by a molding die having a molding cavity 6. As shown in FIG. 3; for the molding die without the molding cavity 6, similar to the bubble forming vacuum, the barrel film can still be produced by the elastic carrying pad 3, but the shape control of the barrel film is not restrained in the molding cavity 6. The accuracy of the next.
  • the pressurizing unit 4 gives the power to be deformed downwardly to the region to be deformed, and the region to be deformed is forced downward by the force to be finally formed.
  • the elastic force of the softened elastic layer is less affected by the elastic force of the elastic carrying pad 3, and the deformation of the elastic carrying pad 3 is synchronized.
  • the amount of deformation of each position of the elastic carrying pad 3 determines the deformation amount of the sheet 1 to be thermoformed which is deformed in synchronization therewith.
  • the elastic coefficient of one position of the elastic carrying pad is larger, and the smaller the deformation amount is, the smaller the positional shape variable corresponding to the thermoformed sheet is, and the thicker the thickness is.
  • the heating unit may be a heat conduction heating unit or a heat radiation heating unit;
  • the heating unit may be selected from a heat radiation heating structure.
  • a convex lens 13 Resnel lens
  • the power source is concentrated into parallel light
  • the synchronous assembly 7 is radiantly heated.
  • the orthographic projection area of the parallel light illumination remains substantially unchanged.
  • the elastic carrying pad 3 can be selected from black for absorbing heat radiation energy, and the thermoformed sheet 1 is heated on the backlight surface of the elastic carrying pad 3 by the elastic carrying pad 3 (heat conduction mode) instead of Receive light, which prevents UV radiation from decomposing.
  • the heating unit may be a heat conduction heating structure.
  • the output end of the hydraulic pump 9 is electrically connected to the inner cavity of the cover 11 through a pipeline; in the downstream pipeline of the hydraulic pump 9, a coupling heat exchanger 14 (which can be electrically heated) passes through the heat exchanger 10
  • the heat-conducting fluid enters the cavity of the cover 11 to heat the elastic carrying pad to realize the heating function.
  • the pressing unit may be a positive pressure pressing unit, and may be a negative pressure pressing unit;
  • the pressurizing unit 4 is a negative pressure pressurizing structure.
  • the vacuum pump 8 is included, and the output end of the vacuum pump 8 communicates with the inner cavity of the molding cavity 6 through a pipeline; a branch road is arranged on the pipeline, and a switch is installed on the branch road; the vacuum pump 8 creates a negative pressure in the molding cavity 6, and the synchronous assembly 7 is subjected to deformation by atmospheric pressure, deformed into the molding cavity 6, and after the synchronous assembly 7 reaches a predetermined depth, the suction negative pressure is stopped, the heating is stopped, and the thermoformed sheet 1 is cooled (air-cooled, liquid-cooled, Natural cooling can be), then turn on the switch, the gas enters the molding cavity 6, the synchronous assembly is reset, and the formed barrel film can be taken out.
  • the pressurizing unit 4 may also be a positive pressure pressurizing structure.
  • the hydraulic pump 9 is included; the compression sealing device is a cover 11; the output end of the hydraulic pump 9 is electrically connected to the inner cavity of the cover 11 through a pipeline; the cover 11 is covered on the synchronous assembly 7, and is pressed against the synchronous assembly 7. Sealed; a switch is connected to the bottom of the molding cavity 6.
  • the hydraulic pump 9 (the pneumatic pump can also be used) produces a positive pressure, and the fluid (gas or liquid) in the molding chamber 6 is discharged outward through the relief valve 10.
  • the heating unit 5 heats the synchronous assembly 7 and, after molding, stops heating, the formed barrel film is cooled, and finally the switch is turned on, the gas or liquid enters the molding cavity 6, and the synchronous assembly 7 is reset and taken out.
  • the barrel film after molding can be used.
  • the switch can also be connected in parallel with the safety valve 10; the safety valve 10 can set the pressure in the molding cavity 6 to keep it stable, so that after the molding cavity 6 has a certain pressure, the synchronous assembly 7 is subjected to pressure on both sides, so that it is to be heated
  • the pressure between the molded sheet 1 and the elastic carrying pad 3 is increased, and the corresponding frictional force is increased, and the frictional force can further secure the synchronization between the thermoformed sheet 1 and the elastic carrying mat 3.
  • thermoformed sheet 1 and the elastic carrying mat 3 are divided into two types: 1.
  • One is that the elastic carrying mat 3 is placed, bonded or crimped onto the forming mat 2, The thermoformed sheet 1 is adhered to the upper portion of the elastic carrying pad 3; the compression sealing device 27 presses the sheet 1 to be thermoformed onto the elastic carrying pad 3; the function of the compression sealing device 27 is to deform in the synchronous assembly 7. The stability of the position of the synchronous assembly 7 and the sealing property with the forming backing ring 2 are maintained; 2.
  • Another sheet to be thermoformed 1 is placed on the forming backing ring 2, and the elastic carrying mat 3 is to be thermoformed. The upper portion of the sheet 1 is in close contact; the compression sealing device 27 presses the elastic carrying pad 3 against the sheet 1 to be thermoformed. With this arrangement, the elastic carrying pad 3 can be directly bonded to the compression sealing device 27.
  • the structure of the compression sealing device can be divided into many types, and the present invention cites several examples:
  • the compression sealing device comprises: a pressure ring 28, the pressure ring 28 is mounted with a bolt buckle 29 snap-fitted with the forming gasket 2;
  • the crimping sealing device comprises: a cover 11, a bracket 30, and a hydraulic rod 31; the bracket 30 is connected to the forming die, and the fixed end of the hydraulic rod 30 is mounted on the bracket 30, and the free end of the hydraulic rod 30 It is connected with the cover 11; in addition to the external force support by means of a bracket, the cover can also be designed with a heavier mass, and the synchronous assembly 7 is pressed and sealed onto the molding die by its own gravity.
  • the thermoforming apparatus further includes a cooling unit; the cooling unit is configured to cool the shaped region to be deformed.
  • the cooling unit adopts an alternating liquid cooling method between elastic carrying cushions.
  • the utility model comprises a cooling compartment, a hot piston 15, a cold piston 16, a cold exchanger 18 coupled with the cold piston 16, a heat pipeline 23, and a cold pipeline 24;
  • the elastic carrying mat is divided into an upper elastic carrying mat 3.1 and a lower elastic carrying mat 3.2;
  • the edge of the elastic carrying pad 3.1 and the lower elastic carrying pad 3.2 is sealed;
  • the gap formed between the upper elastic carrying pad 3.1 and the lower elastic carrying pad 3.2 is a cooling compartment; between the upper elastic carrying pad 3.1 and the cover 11
  • the formed cavity is a heating cavity;
  • the cold piston 16 is electrically connected to the cooling compartment through the upper elastic carrying pad 3.1 through the cold pipe 24;
  • the cold pipe 24 is sealingly connected with the upper elastic carrying pad 3.1;
  • the hot piston 16 is passed through the hot pipe 23 Conducted with the heating chamber.
  • the pressurizing unit adopts a piston structure.
  • the hot piston 15 functions to accommodate the heating fluid 21, and integrates a heating unit (the heating unit is here a heating wire 17), and the hydraulic fluid is heated by the heating wire in the hot piston to form the heating fluid 21,
  • the hot piston rod 19 is linked with a power mechanism external to the device (which can be externally pneumatic, electric, hydraulic). After the hydraulic fluid temperature is heated to a preset temperature, the external power pushes the hydraulic fluid in the hot piston 15 into the heating chamber. The synchronous assembly is heated and pressed to form.
  • the cooling unit employs a piston structure in which the cold piston 16 functions to contain the cooling fluid 22 and incorporates a cold exchanger 18 that is cooled within the cold piston 16 by the cold exchanger 18.
  • the cold piston rod 20 is interlocked with the power mechanism outside the device. After the synchronous assembly 7 is formed, the cooling fluid 22 is pushed into the cooling chamber, and the hydraulic fluid is equally drawn back into the hot piston 15, so that the formed synchronous assembly is cooled and shaped. . After cooling and setting, the cooling fluid 22 is withdrawn to the cold piston 16, and at the same time, the switch is turned on, the gas or liquid enters the molding cavity, the synchronous assembly is reset, and the formed barrel film can be taken out.
  • the cooling unit adopts a side wall cooling method.
  • the pressurizing unit adopts a pneumatic pressing structure
  • the heating unit adopts a heat radiation heating structure (infrared heater 12, convex lens 13).
  • the cooling unit includes: an outer wall side wall cooler 25 disposed in the molding cavity 6; and a bottom cooler 26 disposed at the bottom of the molding cavity 6.
  • the two coolers are turned on, and the infrared heater 12 is turned off.
  • the exhaust switch of the cover 11 and the intake switch of the molding chamber 6 are opened, and the synchronous assembly 7 is reset.
  • the cooler is not opened, the refrigerant does not enter the cooler, and the side walls and the bottom of the molding cavity 6 are heated during the molding of the synchronous assembly 7.
  • the side walls and the bottom of the molding cavity 6 are first cooled, and finally the synchronous assembly 7 is cooled.
  • the cooling unit employs a fluid direct cooling structure.
  • the cooling unit comprises a cold piston 16 and a cold exchanger 18 coupled to the cold piston 16; the cold piston 16 is electrically connected to the bottom of the chamber formed by the synchronizing assembly 7 via a line.
  • the pressing unit adopts a negative pressure pressing structure, and the heating unit adopts a heat radiator; after the synchronous assembly 7 is formed, the cooling liquid is directly injected into the cavity formed by the synchronous assembly 7, and then the cooling liquid is extracted.
  • cold air can be used to directly cool the cavity.
  • the elastic carrying mat is the core part of the invention, and the elastic carrying mat is made of elastic material; the material with high elastic stretch ratio is selected, such as silica gel, natural rubber, etc., wherein the silicone has good high temperature resistance, and the natural rubber needs high temperature resistance. modified.
  • the setting of the spring constant can be in three forms.
  • the change in modulus of elasticity can be achieved by changes in the material. For example, in the molding process of silica gel or rubber, the hardness of different regions is set to be large to small, and the modulus of elasticity can be controlled.
  • the thermoformed sheet itself is a raw material for production, which is processed in a single shape, and is subjected to secondary processing of the present invention to form a barrel film. Therefore, the material to be thermoformed is made of thermoplastic, such as common PVC, PE, PP, ABS, and the like.
  • the thermoformed sheet may be a single-layer plastic or a multi-layered plastic laminate; when the multi-layered plastic laminate is heated, the temperature needs to reach a range in which the plastic softens without melting, such as HDPE, and the softening temperature is 125 to 135°. At the softening temperature, there is less adhesion between the plastic layers; in order to prevent the plastic layers from interposing, a release layer may be filled between the plastic layers.
  • the release layer may be a release agent (dimethicone), which may be solid particles such as talc powder; when the product is used as a garbage bag, the release layer may also be mixed with a solvent or granule for inhibiting bacteria and insects.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Abstract

La présente invention concerne un dispositif de thermoformage se rapportant au domaine technique des machines de thermoformage de plastique, et comprenant : un moule pour thermoformage, un tampon élastique portable (3), une unité de mise sous pression (4), une unité de chauffage (5), et un dispositif de compression et d'étanchéité (27). Le moule pour thermoformage est pourvu d'une bague de joint d'étanchéité (2). Le tampon élastique portable (3) et une feuille (1) à thermoformer sont en contact étroit et forment un ensemble (7) agissant de manière synchrone. L'ensemble (7) est pressé contre la bague de joint d'étanchéité (2) et est rendu étanche avec celle-ci au moyen du dispositif de compression et d'étanchéité (27), et une région à déformer dans l'ensemble (7) est alignée avec un bord de la bague de joint d'étanchéité (2) marquant l'entrée d'une cavité de moule. Une extrémité de sortie de pression de l'unité de mise sous pression (4) et une extrémité de sortie de chaleur de l'unité de chauffage (5) agissent toutes deux sur la région à déformer dans l'ensemble (7). La pression fournie par l'unité de mise sous pression (4) est dirigée vers la région à déformer de telle sorte que la région à déformer est évidée dans la cavité de moule le long du bord de la bague de joint d'étanchéité (2). La température de chauffage fournie par l'unité de chauffage (5) est la température à laquelle une partie de la feuille (1) correspondant à la région à déformer commence à ramollir et est prête pour le thermoformage. La présente invention permet de produire un film en forme de tonneau qui est formé d'un seul tenant.
PCT/CN2019/085407 2018-05-07 2019-05-02 Dispositif de thermoformage WO2019214525A1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
CN201810427731.2 2018-05-07
CN201810427731 2018-05-07
CN201910129800.6A CN110450392A (zh) 2018-05-07 2019-02-21 热成型装置
CN201910129800.6 2019-02-21

Publications (1)

Publication Number Publication Date
WO2019214525A1 true WO2019214525A1 (fr) 2019-11-14

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PCT/CN2019/085407 WO2019214525A1 (fr) 2018-05-07 2019-05-02 Dispositif de thermoformage

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112959604A (zh) * 2021-02-02 2021-06-15 西安双健包装有限公司 一种塑料杯成型机及其成型工艺

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1520352A (zh) * 2001-06-19 2004-08-11 ���ְ�װ��˾ 用于形成片材的设备、成型装置和方法
GB2451735A (en) * 2007-08-06 2009-02-11 Calsonic Kansei Corp A vacuum forming apparatus and method for producing a sag in a selected portion of a resin sheet

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN1520352A (zh) * 2001-06-19 2004-08-11 ���ְ�װ��˾ 用于形成片材的设备、成型装置和方法
GB2451735A (en) * 2007-08-06 2009-02-11 Calsonic Kansei Corp A vacuum forming apparatus and method for producing a sag in a selected portion of a resin sheet

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112959604A (zh) * 2021-02-02 2021-06-15 西安双健包装有限公司 一种塑料杯成型机及其成型工艺

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