TWI329568B - - Google Patents

Description

1329568 IX. Description of the Invention: [Technical Field] The present invention relates to a film forming apparatus and a film forming method, and more particularly to a film forming apparatus and a forming method for heating a film and then performing high pressure forming. [Prior Art] Generally, in order to have a decorative pattern on the surface of a plastic product, it is possible to attach the decorative pattern to the surface of the plastic product by thermal transfer, or to inject through the in-mold (In-mold decorati〇n, For the process of imd), the in-mold injection molding mainly prints the pattern to be decorated on a plastic film, and forms a pre-formed outer structure by high-pressure molding or vacuum forming, and then the plastic film periphery is redundant. After the material is cut, the injection molding is performed in the mold, and the plastic film is combined with the injection molded plastic, so that the decorative pattern on the plastic film is coated on the surface of the injection molded article.

Figure 1 is a conventional method for processing a plastic film to a predetermined size. The high-pressure molding machine 1 can be used as an in-mold injection molding, the winding machine D1, an upper die 12, a lower die 13 and a heating element 14 disposed on the machine 11, and the lower die 13 There is a mold pad η〗, the mold 13 is a vane drive relative to the upper die 12 up and down, and heating 7 7 14 can be driven forward (vertical direction of the plane) into the machine '; The upper die 12 and the lower dust mold 13 are separated from the machine U between or backward (in the direction perpendicular to the drawing). In the case of the inter-pressure forming, a plastic film 1 is placed on the die pad 131 of the lower die 5 ^ 1329568 13 , and then the heating element 14 is driven into the upper die 12 and the plastic film is just pressed between the stampers. Heating, the plastic film (10) is softened. After heating for a period of time, the heating element 14 is driven to exit the machine table 11, and the lower die 13 is driven along with the die pad 131 to be adjacent to the upper die 12 to make the plastic film 1〇〇. It is sandwiched between the upper stamper 12 and the lower stamper, and high-pressure air is poured between the upper stamper 12 and the lower stamper 13 to plastically deform a local region of the plastic film 100 to be stretched to form a high yield difference. The three-dimensional structure, finally, driving the lower die 13 down from the upper die 12' can take out the formed plastic film for in-mold injection molding. However, since the high-pressure molding machine 1 does not receive any pressing force when the plastic film 100 is placed on the lower pressing film 13, when the plastic film 100 is heated to a certain temperature, warpage deformation starts to occur, so that when When the plastic film 100 is sandwiched between the upper stamper 12 and the lower stamper 13 for high-pressure molding, the portion of the plastic film 1 that has been warped and deformed is more likely to wrinkle, resulting in a flaw in appearance after molding. Used for subsequent in-mold injection molding operations. A phenomenon in which the above-mentioned plastic film 100 is prevented from being slightly deformed during heating is known. After the plastic film 100 is placed on the lower mold 13, a press plate (not shown) is further added to the plastic film 100 by manual fine work. Therefore, the plastic film 100 can be kept in a flat state during the heating process, but this method is not only labor-intensive, but also prone to improper operation, inconsistency, error, and inconsistent results. Another conventional method for avoiding the deformation of the plastic film 100 during the heating process is to limit the heating element 14 to a certain temperature so that the plastic film 100 does not overheat and warp, but this practice only It can be limited to the case where the height difference of the structure to be stretched is less than 1 cm, and if the plastic film 100 is subjected to a larger size (height difference of j cm or more), the plastic film is smashed. It is easy to cause the softening degree to be insufficient, and in the stage of the subsequent high-pressure molding, the portion of the plastic film is partially shaped by being forcedly pulled by the high-pressure gas, thereby causing the color of the molded product to be uneven or forced to be stretched. Traces that form the appearance of flaws. In addition, since the molding operation of the plastic film of the high-pressure molding machine is only one high-pressure molding performed when the upper die 12 and the lower die π are closed, the magnitude of the required plastic deformation is relatively large. Large processing conditions 'If the above-mentioned problem of insufficient degree of softening of the heat is added, the molding apparatus having only one stage of forming step can easily cause the plastic film to rebound after being plastically deformed due to its own restoring stress. For the shape error, the same can not be used for the subsequent residual material cutting and in-mold injection molding. See Figure 2 for the Republic of China application number 93208563 - "High [Molding ^ and preparation" patent case, the technology disclosed After the plastic film 400 is fixed on a tray 41 and heated by the heating element, the tray 41 and the plastic film 4 are fed between the upper die 43 and the lower die to perform the south press forming operation. However, this molding equipment also performs only a stage of the south pressure forming step (upper and lower willing to draw - the lower anti-nuclear 43, 44 clamping), therefore, it is still only suitable for the required deformation time is small of Type work on. 7 1329568 SUMMARY OF THE INVENTION Therefore, the object of the present invention is to provide a film forming apparatus which can prevent the film from being deformed during heating by using a pre-pressing device, and the pre-pressing device can be combined with the upper and lower molds. A two-stage forming step whereby the film can be formed into the desired profile. Another object of the present invention is to provide a film forming apparatus which is different in structure and can be applied to a processing condition in which a required deformation range is large.

A further object of the present invention is to provide a film forming method in which the forming step is divided into two stages, thereby reducing the influence of the recovery stress on the film forming, so that the film can be molded into a desired outer structure.

The film forming apparatus of the present invention can be used to form a film of a plastic material or a metal material, the film forming apparatus comprising a machine table, an upper mold unit disposed on the machine table, a lower mold unit, a power unit, a heating unit and a preload Device. The lower die unit is located below the upper die unit and is adapted to place the film. The power unit is configured to drive one of the lower die unit and the upper die unit to be adjacent to and away from the other. The preloading device includes a preloading member between the upper die unit and the lower die unit, the preloading member being driven down to the lower die unit, and the film is clamped to the preload Between the pressing member and the lower die unit, thereby preventing the film from being warped during heating by the heating unit. According to the film forming apparatus of the present invention, the upper mold unit includes an upper mold base disposed on the machine base, and an upper mold set under the upper mold base. The lower mold unit includes a lower mold base, and a lower mold base is disposed thereon. The lower stamper on the mold base, the: s 8 1329568 plastic thin mold can be placed on the lower stamper. According to the film forming apparatus of the present invention, the lower mold unit further includes a mold pad elastically slidable on the lower mold, the film being usable for being placed on the mold cushion.

According to the film forming apparatus of the present invention, the upper stamper is formed with an upper molding portion formed with a pair of lower molding portions to be formed; when the upper molding die is engaged with the lower molding die, the upper molding portion is The lower forming portion cooperates to deform the film, and the pre-pressing member is a plate-like structure, and the pre-pressing member is hollowed out corresponding to the region of the upper molding portion and the lower molding portion. According to the film forming apparatus of the present invention, the preloading device further includes a driving unit and a linkage mechanism, and the preloading member is mechanically coupled to the driving unit through the linkage mechanism. The film forming apparatus according to the present invention further comprises a control unit and a power unit, the power unit can be a hydraulic device, and the lower mold base is driven by the hydraulic device. The control unit can be connected to the power unit. Programmable

The controller unit can be a hydraulic cylinder through which the control unit can control and drive the driving unit to act to cause the preloading element to move up and down. The film forming method of the present invention is carried out by using a film forming apparatus including a pre-compression element interposed between the upper mold unit, the lower mold unit, and the unit and the lower mold unit, and a high pressure gas supply. unit. The film forming method is to place a film on the lower mold unit, and press the pre-pressing unit to press the film on the lower mold unit, and then use the heating unit to be placed on the lower mold unit. After the film is heated by 9 1329568, (4) the high-pressure gas supply unit extracts the film from the lower die unit, so that the film is adsorbed by the lower die unit to generate a first-stage deformation, and then the lower die unit is driven upwardly. Under the upper mold unit, the heat-softened film is deformed in a second stage, and finally the lower mold unit is driven downwardly away from the upper mold unit, and the formed film is taken out. According to the film forming method of the present invention, when the upper mold unit is closed with the lower mold unit, the high pressure gas supply unit simultaneously blows high pressure gas from the upper mold unit, so that the film can be pressed against the high pressure gas. Attached to the lower die unit. The invention adopts the pre-pressing device to press and position the film, which not only avoids warpage deformation caused by heat of the film, but also reduces the influence of the recovery stress on the formed film through the two-stage forming step, and can accurately form the film. Pre-obtained exterior structure. The above and other technical contents, features, and advantages of the present invention will be apparent from the following detailed description of the preferred embodiments. Referring to Figures 4 and 5, a preferred embodiment of the film forming apparatus 2 of the present invention is a high-pressure molding machine for molding a plastic film 2 (for example, a film made of polypropylene) which is prepared for in-mold injection molding. For example, the film forming apparatus 2 of the present invention can also be used to form a film of a metal material. The film forming apparatus 2 comprises a machine table 21, an upper mold unit 22, a lower mold unit 23, a power unit (not shown), a pre-pressing device 25, a heating unit 26 and a high pressure unit disposed on the machine table 21. Gas supply unit 24 (only 10 1329568 is partially shown). - The machine table 21 includes a top portion 211 and a plurality of machine posts 212 extending downwardly from the top portion 211. The upper mold unit 22 includes an upper mold base 221 disposed under the top portion 211 of the machine table 21, and an upper mold 222 disposed under the upper mold base 221, and an upper molding portion is formed at the bottom of the upper mold 222, in this embodiment. The upper molding portion is a recess 223. The lower die unit 23 is disposed on the machine table 21 and spaced apart. Below the upper die unit 22, the lower die unit 23 includes a lower mold base 231, which can be φ. Further, a die pad 232 disposed on the lower die holder 231 and a lower die 233 disposed on the lower die pad 231 and interposed between the lower die pad 231 and the die pad 232, and a lower molding portion is formed on the top of the lower die 233. In this embodiment, the lower forming portion is a protruding portion 234 corresponding to the recess 223. Of course, the structures of the upper pressing die 222 and the recess 223 and the protruding portion 234 of the lower pressing die 233 are processed as desired. The structure of the plastic film 200 is not limited to the disclosure of the embodiment. The power unit may be a hydraulic device (not shown) disposed on the machine table 'but it may also be other common power equipment for driving the Φ lower die holder 231 up and down relative to the upper die holder 221 The lower stamper 233 is brought up to the upper stamper 222 or downwardly from the upper stamper 222. The heating unit 26 can be a heating element or a heating device such as a hot plate, a ceramic heating plate or a hot air and an infrared heater. The heating unit can be matched with a sliding rail mechanism extending in the front-rear direction and behind the machine table 21 ( The figure is not:), and is driven by the hydraulic unit of the power unit to advance between the upper mold unit 22 and the lower mold unit 23 along the sliding mechanism, or to withdraw from the upper mold unit 22 and the lower mold unit. Between 23, as for the timing of its operation, the description 11 1329568 preloading device 25 includes a driving unit 251 disposed at the top 211 of the machine table 21, and a preloading member 252 between the upper die unit 22 and the lower die unit 23. , the linkage mechanism of the connection driving unit 251 and the preloading member 252, and a hydraulic device for transmitting the power unit to control the driving unit 251

Actuated control unit (not shown). The driving unit 251 is - oil Μ ^ in the embodiment, and the control unit is a programmable controller (with mabie Logic Contr〇ller, pLC for short), and the hydraulic cylinder is connected with the hydraulic device of the power unit. Connected and controlled by a programmable controller. The pre-stressing member 252 is a plate-like structure and the pre-stressing member corresponds to the (four) 253 hollow of the recess 223 of the upper stamper 222 and the projection 234 of the lower stamper 233, and its function (4) is explained. The linkage mechanism includes two linkage rods 254 respectively located on opposite sides of the upper mold unit 22, and the two linkage rods are respectively connected at their bottom ends to the left and right sides of the preloading member 252, and the top end is coupled to the driving unit 251.

Power Connection 'This power connection can be a way to achieve a transmission effect for any connection that is commonly used in the mechanical field. Thereby, when the driving single & 251 controlled single=drive, the pre-compressing element 252 can be driven to move up and down between the pull sheet το 22 and the lower mold sheet 23 through the two interlocking rods 254. The high-pressure gas supply unit 24 may be a high-pressure gas generating device including an air compressor, which is provided below the high-pressure gas supply unit 24 231, the function of which will be described later. Referring to FIG. 3', the first preferred embodiment of the film forming method of the present invention comprises the following steps: v. 31. Referring to FIG. 6' First, the lower die unit is driven forward to move out of the upper plate 22 below' The plastic film to be formed is placed on the mold 12 1329568 pad 232, and the lower mold unit 23 is driven to move backward into the machine table 21 below the upper mold unit 22. Step 32: Referring to FIG. 7 and FIG. 8, when the lower die unit 23 is moved to the position below the upper die το 22, the driving unit 251 drives the pre-pressing member 252 to be placed on the die pad 232, and the plastic film is 〇 The crucible is positioned on the die pad 232 and sandwiched between the die pad 232 and the pre-stressing element 252. Step 33: Next, the heating unit 26 is driven forwardly into the machine table 21 and is placed above the pre-stressing element 252 to heat the plastic film 2〇〇 below, since the plastic film 200 has been pressed by the pre-pressing element 252 on the die pad At 232, therefore, no warping deformation occurs during heating. Step 34. Referring to FIG. 9, after the heating unit 26 heats the plastic film 200 for a certain period of time, it is driven to exit the machine table 21 and return to the position of FIG. 6, while the lower die holder 23 1 is driven upward. Under the die pad 232, the lower die 233 on the lower die holder 231 has its protruding portion 234 passing upward through the die pad 232 to push the partial portion of the plastic film 200 upwardly out of the hollowed out region 253 of the pre-pressing member 252. The plastic film 2 which is softened by heating is first subjected to the struts of the projections 234 of the lower stamper 233 to produce the first stage of molding. The high pressure gas supply unit 24 draws the plastic film 200 from the lower mold 233 while the lower mold base 231 is attached to the lower side of the mold pad 232, thereby causing the lower mold 233 plastic film 200 to produce an adsorption. The gas negative pressure causes the plastic film 200 to be adsorbed on the surface of the lower stamper 233. Step 35. Referring to FIG. 1A, the lower die unit 23 and the pre-stressing member 252 are driven by the power unit to be adjacent to the upper die unit 22, so that the pre-stressing member 252 is attached to the lower die 222. When the upper pressing 13 1329568 mold 222, the lower pressing mold 233 and the pre-pressing member 252 are overlapped, and the upper pressing mold 222 pocket 223 is fitted with the lower pressing mold 233 protruding portion 234, and the plastic film 2 is folded. Further, the structural shape in which the pocket 223 is fitted to the projection 234 is formed, which is the second stage of the molding operation. During the second stage of molding, the high-pressure gas supply unit 24 blows high-pressure gas from the upper mold 222 toward the film 2, and forms a positive pressure of the gas against the plastic film 2 by the high-pressure gas, and then cooperates with the lower mold. 233 a negative pressure generated by the plastic film 200, whereby the plastic film 200 can be completely formed by the high pressure of the upper die holder 222 and the lower die holder 231 to form a structural shape in which the upper die 222 and the lower die 233 are matched. 36: Referring to FIG. u, then, the lower die unit 23 is driven downward to disengage from the upper die unit 22, and the pre-pressing member 252 is separated from the die pad 232 to return to the state of FIG. 4, and then the lower die unit 23 is driven forward. The plastic film 2 can be taken out by removing the machine 21 from the machine. It should be noted that, in the above step 34, the action of attaching the lower die holder 231 to the die pad 232 may be performed. In step 35, the lower die holder 231 is placed on the upper surface of the lower die holder 231 together with the pad 232 and the pre-stressing member 252. The movement period under the lower die 222 is simultaneously performed, or the heating unit 26 may be heated during the heating, and the lower die holder 23 1 starts to slowly approach the die pad 232 so that the protrusion 234 can be gradually supported on the plastic. The film 2 is caused to begin to gradually deform. Furthermore, in the first preferred embodiment described above, it is disclosed that the lower die unit 23 has the pad 232 so that the film 2 can be sandwiched between the die pad 232 and the pre-stressing member 252. However, in fact, the pre-stressing element 252 can also cooperate with the structural design of the lower pressing and replacing 22 to achieve the effect of pressing the film 2 to form 14 1329568 position so as not to be deformed during the heating process, and is not limited to the implementation. The manner in which the mold pad 232 is fitted. In Fig. 11, the two-stage molding method of the present invention can be used in the actual operation. The plastic film 2 to be formed has a height difference of more than i centimeters, and can have a good effect and is less likely to be ashamed. The problem of molding error occurs due to the recovery of stress.

Referring to FIG. 12, a second preferred embodiment of the present invention differs from the first preferred embodiment in the 'in the second preferred embodiment, the lower die unit', and the die pad 232 is omitted (see FIG. 4). In addition, in the second preferred embodiment, the upper molding portion of the upper molding die 222 is a convex portion cut, and the lower molding portion of the lower pressing die 233 is a concave portion Mg. .

With the film forming apparatus 2 of the present invention, the second preferred embodiment performs the second preferred embodiment of the film forming method, which corresponds to the step 31 of the above-described first preferred embodiment, and the second preferred embodiment is to laminate the film 2 〇, placed on the lower stamper 233, on. Corresponding to step 32 of the first preferred embodiment, the second preferred embodiment is to drive the pre-pressing member 252 down to the lower stamper 233 so that the film is sandwiched between the (4) member 252 and the lower stamper 233. between. Corresponding to (4) 33 of the first preferred embodiment, the second preferred embodiment also drives the heating unit 26 to heat the thin 帛 2 〇〇 ' at this time, since the film 靡 is sandwiched between the pre-dust π 252 and the pressing Between the molds 233', thin g fines can be avoided, and the distortion is generated during the heating process. Corresponding to the fourth embodiment of the first preferred embodiment, in the second preferred embodiment, since the lower molding portion of the lower pressing die 233 is the recess 234, the first stage deformation of the film 2 is by pressing The mold is 3, and an negative pressure of the adsorbed gas is generated on the film 200 to make the film thin and adsorbed.

15 1329568 is attached to the surface of the recess 234' of the lower stamper 233. Corresponding to step 35 of the first preferred embodiment, in the second preferred embodiment, the lower stamper 233 is driven, stacked with the pre-pressing member 252, placed on the upper stamper 222, and pressed upward. 222' produces a positive pressure of the film 200' which is pressed down against the film 2', so that the film 200' is deformed in the second stage, so that the upper die 222' and the lower die 233' are formed. The shape, and then, the lower stamper 233 and the pre-pressing member 252 are driven downward and the formed film 2 is removed. As can be seen from the above two preferred embodiments, the present invention presses and positions the plastic film 200, 200' by providing the pre-pressing member 252, so that the plastic film 2, 200' can withstand a higher heating temperature without causing warping. The curvature is deformed, and since the plastic film can withstand a high heating temperature, the plastic film is 2 〇〇, 2 〇〇, and there is no problem that the appearance color is uneven due to the lack of softening. Further, since the preload member 252 is driven by the control unit to drive the drive unit 251, it is possible to avoid unnecessary labor and the occurrence of errors which are easily caused by manual operations throughout the molding work. Furthermore, since the heating element 26 heats the plastic film 2〇〇, 2〇〇, the pre-pressing member 252 has been pressed on the plastic film 2〇〇, 2〇〇, thus driving the lower stamper 233, 233' First, the plastic film 2〇〇, 2〇〇, first pre-formed the -p segment, the lower die unit 23, 23, and the pre-pressing element 252 are driven and the upper die unit 22 is closed. The second stage of forming is carried out, so that the two-stage forming step can reduce the rebound phenomenon of the plastic film 2〇〇, 200' during the deformation process as a recovery stress, and can be formed more accurately. The obtained outer structure avoids the plastic film 200, 200, because of the influence of the stress recovery itself, which causes an error, which affects the subsequent cutting of the residual material 16 1329568 and the in-mold injection molding. In summary, the present invention can not only solve the problem of thermal warping deformation of the plastic thin molds 200, 200' by the arrangement of the pre-pressing device 25, but also achieve an automated operation 'through the control of the control unit, and can also cooperate The lower mold unit 23, 23' and the upper mold unit 22 perform a two-stage forming step, and the plastic film 200, 200' can be formed to form the desired outer structure, thereby reducing the plastic film 200, 200' during the molding process. Forming errors due to stress recovery. However, the above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, that is, the simple equivalent changes and modifications made by the scope of the invention and the description of the invention, All remain within the scope of the invention patent. In addition, the abstract sections and headings are only used to assist in the search for patent documents and are not intended to limit the scope of the invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a front view of a conventional high-pressure molding machine; FIG. 2 is a schematic diagram of a “high-pressure molding apparatus” of the Republic of China application No. 932〇8563; FIG. 3 is a film forming method of the present invention. The flow chart of the steps of the first preferred embodiment; Fig. 4 is a schematic view of the film forming apparatus of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS FIG. 5 is a side view of a first preferred embodiment of a film forming apparatus of the present invention. 17 1329568 FIG. 6 is a plastic film of a preferred embodiment of the film forming method of the present invention. FIG. 7 is a schematic view showing the steps of placing the plastic film on the mold pad and heating in the first preferred embodiment of the film forming method of the present invention; in the steps of FIG. 8 and FIG. A front view of the state of the film forming apparatus, and FIG. 9 is a schematic view showing a step of deforming the plastic sheet (four) in a first stage in the first preferred embodiment of the film forming method of the present invention; plastic: film 1 - In a preferred embodiment, a schematic diagram of the step of deforming the plastic film to produce a second stage; Forming: Pen 2 In the first preferred embodiment of the film forming method of the present invention, a schematic view of the steps of the plastic film is completed. Front view of a second preferred embodiment of the type of device 18 1329568 [Explanation of main component symbols] 2 ......... • Film forming apparatus 233... •... Lower stamping die 200... • Plastic film 2335 ·· • ...lower die 200, •plastic film 234... •...protrusion 21........ •machine 2345 ···...recess 211... •top 24"...?...high pressure gas supply unit 212 ...... • Machine column 25·.··_ •...Preloading device 22.........Upper die unit 251...•...Drive unit 221... • Upper die holder 252... •...Preloading element 222 ...... • Upper stamper 250... •... Linkage mechanism 222,...·· • Upper stamper 253 .... •... cutout area 223... • Pocket 254 ···. ... linkage rod 223,..... Projection portion 26...heating unit 23' 2V • lower die unit 31-36- ...step 231... • lower die holder H'... ...height difference 232... • die pad 19

Claims (1)

1329568 X. Patent application scope: The film forming apparatus 1· A film forming apparatus for forming a film comprises: a machine table; an upper mold unit disposed on the machine; the lower mold unit is disposed on the machine And spaced apart from the upper mold unit, the film can be placed on the lower mold unit; a power unit for driving the lower mold unit and the upper mold unit adjacent to and away from the other; a heating unit that is driven to be displaced above the lower mold unit to heat the film or exit the upper mold unit; and a pre-pressing device including a driving unit disposed on the machine and connected to the power unit And a pre-stressing element between the upper die unit and the lower die unit. The pre-pressing component is dynamically coupled to the drive unit and is drivable adjacent to the lower die unit by the drive unit and the film is placed under the die Between the die unit and the preload element. 20 1329568 Do not connect to the blade-connecting lever on both sides of the pre-stressing element. The top of the two-linking lever is electrically connected to the driving unit. 4. The film forming apparatus according to claim 1, wherein the upper mold sheet S comprises an upper mold 4, the upper mold is formed with an upper molding portion, and the lower mold unit includes The stamper is formed, and the lower mold is formed with a pair of lower molding portions that are to be formed. A ^ 4, when the upper mold is joined to the lower mold, the upper molding portion and the lower molding portion. The μ phase is matched to deform the film. The pre-pressing member is a plate-like structure, and the pre-compression member is hollowed out corresponding to the region of the upper molding portion and the lower molding portion. 5. The thin boring forming apparatus according to claim 3, wherein the power unit is a hydraulic device, and the driving unit is a hydraulic cylinder connected to the oil device. 6. According to the scope of the patent application! The film forming apparatus of the present invention further comprises - a high-pressure gas supply unit for generating a high-pressure gas, by means of the high-power gas supply unit, the upper mold unit and the τ-mould unit pair (4) are press-formed. @ 7. The film forming apparatus according to claim 4, further comprising a control unit coupled to the power unit and the driving unit, and controlling the driving unit to operate by the power unit. A film forming method comprising: using a film forming apparatus, the film forming apparatus comprises an upper mold unit, a lower sheet 70 spaced apart from the upper mold unit, and an upper mold unit and the lower mold unit. a pre-compression element and a high-pressure gas supply unit, the film forming method comprising: 21 (A) placing a film on the lower mold unit; (B) using the pre-compression element to press the film to be located in the lower mold unit [C) heating the film that is pressed to be placed on the lower mold unit; the lower mold unit produces a first stage (D) for the thinning, by which the high pressure gas supply unit is pumped by the film, so that The film is deformed by the lower die unit; (E) relatively close between the lower die unit and the upper die unit, causing the heat-softened film to undergo a second-stage deformation; and (F) causing the lower die unit to The upper mold units are relatively far apart from each other, and the formed film is taken out. 9. The film forming method according to claim 8, wherein the lower die unit comprises a lower die, and in the step (D), the film is adsorbed and attached to the lower die surface. 10. The film forming method according to claim 9, wherein the lower die unit further comprises a die pad elastically disposed on the lower stamper, wherein the film is placed in the step (A) On the mold pad; in the step (B), the film is sandwiched between the mold pad and the pre-pressing member: in the step (D) +, the lower mold is simultaneously driven adjacent to the mold pad 11 The film forming method according to the invention of claim 8, wherein in the step (E), the high-pressure gas supply unit simultaneously blows a high-pressure gas from the upper mold unit to the film. Attached to 22 1329568 the surface of the lower die unit. 12. The film forming method according to claim 8, wherein the film is made of plastic or metal. twenty three