US20130313762A1 - Vacuum forming method - Google Patents

Vacuum forming method Download PDF

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Publication number
US20130313762A1
US20130313762A1 US13/982,010 US201213982010A US2013313762A1 US 20130313762 A1 US20130313762 A1 US 20130313762A1 US 201213982010 A US201213982010 A US 201213982010A US 2013313762 A1 US2013313762 A1 US 2013313762A1
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US
United States
Prior art keywords
vacuum
vacuum forming
thermoplastic resin
resin sheet
mold
Prior art date
Legal status (The legal status 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 status listed.)
Abandoned
Application number
US13/982,010
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English (en)
Inventor
Shigeyuki Katou
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Micropelt GmbH
Marelli Corp
Original Assignee
Micropelt GmbH
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Filing date
Publication date
Application filed by Micropelt GmbH filed Critical Micropelt GmbH
Priority claimed from PCT/JP2012/051585 external-priority patent/WO2012102316A1/ja
Assigned to CALSONIC KANSEI CORPORATION reassignment CALSONIC KANSEI CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: KATOU, SHIGEYUKI
Publication of US20130313762A1 publication Critical patent/US20130313762A1/en
Abandoned legal-status Critical Current

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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/02—General constructional details
    • G01R1/06—Measuring leads; Measuring probes
    • G01R1/067—Measuring probes
    • G01R1/07—Non contact-making probes
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R15/00—Details of measuring arrangements of the types provided for in groups G01R17/00 - G01R29/00, G01R33/00 - G01R33/26 or G01R35/00
    • G01R15/14—Adaptations providing voltage or current isolation, e.g. for high-voltage or high-current networks
    • G01R15/142—Arrangements for simultaneous measurements of several parameters employing techniques covered by groups G01R15/14 - G01R15/26
    • 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
    • B29C51/04—Combined thermoforming and prestretching, e.g. biaxial stretching
    • B29C51/06—Combined thermoforming and prestretching, e.g. biaxial stretching using pressure difference for prestretching
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/145—Indicating the presence of current or voltage
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q9/00—Arrangements in telecontrol or telemetry systems for selectively calling a substation from a main station, in which substation desired apparatus is selected for applying a control signal thereto or for obtaining measured values therefrom
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2209/00—Arrangements in telecontrol or telemetry systems
    • H04Q2209/60—Arrangements in telecontrol or telemetry systems for transmitting utility meters data, i.e. transmission of data from the reader of the utility meter
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04Q—SELECTING
    • H04Q2209/00—Arrangements in telecontrol or telemetry systems
    • H04Q2209/80—Arrangements in the sub-station, i.e. sensing device
    • H04Q2209/84—Measuring functions

Definitions

  • the present invention relates to a vacuum forming method.
  • Vacuum forming is performed for the fabrication of a resin-molded article (e.g., see Patent Document 1).
  • This vacuum forming brings a thermoplastic resin sheet softened by heating into intimate contact with a vacuum forming mold by vacuum suction to shape the thermoplastic resin sheet, and thus fabricates a resin-molded article.
  • a thermoplastic resin sheet softened by heating is pressed into a vacuum forming mold using a core mold before the above-described vacuum suction to be stretched and deformed at the same time.
  • the deep draw portion is basically a protruding or recessed portion and is difficult to form due to an amount of projection larger than usual.
  • a movable plug provided in the core mold is operated during the above-described vacuum suction.
  • the thermoplastic resin sheet is partially stretched and deformed at the same time using the movable plug to form the undercut portion.
  • the undercut portion is basically a deeply indented portion which usually makes mold release difficult.
  • FIGS. 5A to 5D show a vacuum forming method for forming a resin-molded article including a deep draw portion.
  • this vacuum forming method uses a thermoplastic resin sheet 101 softened by heating and an apparatus configuration including a vacuum forming mold 102 (or a cavity mold) and a core mold 103 .
  • the vacuum forming mold 102 and the core mold 103 are vertically arranged across the thermoplastic resin sheet 101 , and are configured to be movable toward and away from each other.
  • the vacuum forming mold 102 has a projecting portion 104 formed therein for forming the deep draw portion, and the core mold 103 has a recessed portion 105 formed therein for forming the deep draw portion.
  • the projecting portion 104 and the recessed portion 105 are configured to have such sizes and shapes as to be fittable to each other with a required space left therebetween.
  • the vacuum forming mold 102 has a large number of vacuum holes 102 a through which vacuum suction can, be performed.
  • FIG. 5A illustrates a state at the start of mold closure.
  • the thermoplastic resin sheet 101 softened by heating is placed between the vacuum forming mold 102 and the core mold 103 vertically separated from each other by a great distance, and is apart from the vacuum forming mold 102 and the core mold 103 .
  • FIG. 5B illustrates a state in the process of the mold closure.
  • the vacuum forming mold 102 and the core mold 103 are closer to each other than in the above state, and a top portion of the projecting portion 104 and an edge portion of the recessed portion 105 are at approximately the same level of height and are both in contact with the thermoplastic resin sheet 101 .
  • a portion 101 a (gap portion, locally stretching portion) of the thermoplastic resin sheet 101 which is located between the top portion of the projecting portion 104 and the edge portion of the recessed portion 105 is in an unstretched state (length A).
  • a portion 101 b (contact portion) of the thermoplastic resin sheet 101 which is in contact with the top portion of the projecting portion 104 loses some of the heat thereof and becomes less stretchable than other portions.
  • FIG. 5C illustrates a state at the completion of the mold closure.
  • the vacuum forming mold 102 and the core mold 103 are closest to each other.
  • the projecting portion 104 and the recessed portion 105 are in contact with the thermoplastic resin sheet 101 while fitting to each other with a required space left therebetween.
  • the above-described portion 101 a of the thermoplastic resin sheet 101 is stretched by an amount corresponding to an amount of fitting of the projecting portion 104 with the recessed portion 105 (length B, B>A).
  • the above-described portion 101 a is out of contact with the vacuum forming mold 102 and the core mold 103 , and therefore loses little of the heat thereof; though a small amount of heat is transferred from the portion 101 a to portions ( 101 b and 101 c ) adjacent to the portion 101 a .
  • the portion 101 a is more stretchable than the adjacent portions ( 101 b and 101 c ) which are in contact with the vacuum forming mold 102 and the core mold 103 . It should be noted that both ends of the portion 101 a are hardly displaced due to frictional resistance to the vacuum forming mold 102 and the core mold 103 .
  • FIG. 5D shows a state (vacuum-clamping completion state) in which the thermoplastic resin sheet 101 is in intimate contact with the vacuum forming mold 102 by vacuum suction.
  • the thermoplastic resin sheet 101 is literally shaped by being entirely brought into intimate contact with the vacuum forming mold 102 .
  • the above-described portion 101 a of the thermoplastic resin sheet 101 is more stretchable than the above-described adjacent portions ( 101 b and 1010 ) and therefore is greatly stretched at a stroke (length C, C>B). It should be noted, however, that since the portion 101 a hardens when stretched to a certain extent or more, the length C also includes part of elongations of the adjacent portions ( 101 b and 101 c ).
  • FIG. 6 is a view of an example of a resin-molded article including a deep draw portion 106 formed by the vacuum forming method of FIG. 5 , and shows an air-conditioning outlet member 107 to be attached to an instrument panel which is provided in a passenger compartment of an automobile.
  • FIG. 7 is a cross-sectional view of FIG. 6 .
  • a portion 106 a around the tip of the deep draw portion 106 in FIG. 7 corresponds to the above-described portion 101 a , and desirably has no local wall thinning as shown in FIG. 7 .
  • the portion 101 a is locally stretched to a great extent by vacuum forming and therefore locally thin-walled.
  • thermoplastic resin sheet 101 When the thermoplastic resin sheet 101 is locally stretched to a great extent and thin-walled as described above, wrinkling and deformation marks due to local wall thinning tend to appear on the resin-molded article. Accordingly, problems may arise when postprocessing is performed on the resin-molded article, or the quality of the resin-molded article itself may decline.
  • thermoplastic resin sheet needs to be used in expectation of local wall thinning.
  • the cost and weight of a component made of the thermoplastic resin sheet increase due to an increase in the amount of usage of resin accordingly.
  • an embodiment of the present invention provides a vacuum forming method for fabricating a resin-molded article.
  • the vacuum forming method includes: pressing a thermoplastic resin sheet softened by heating into a vacuum forming mold using a core mold to stretch and deform the thermoplastic resin sheet at the same time; and bringing the thermoplastic resin sheet into intimate contact with the vacuum forming mold by vacuum suction to shape the thermoplastic resin sheet.
  • at least part of the thermoplastic resin sheet is preshaped using air pressure in such a way that the at least part of the thermoplastic resin sheet is locally stretched and deformed at the same time and thus brought into intimate contact with the core mold.
  • the thermoplastic resin sheet is final-shaped by closing the vacuum forming mold and the core mold and performing vacuum suction through the vacuum forming mold.
  • FIG. 1A shows a vacuum forming method according to an example for forming a resin-molded article including a deep draw portion, and illustrates a state at the start of mold closure.
  • FIG. 1B shows the vacuum forming method according to the example for forming the resin-molded article including the deep draw portion, and illustrates a state in the process of the mold closure.
  • FIG. 1C shows the vacuum forming method according to the example for forming the resin-molded article including the deep draw portion, in which at least part of a thermoplastic resin sheet starts to be locally stretched and deformed at the same time using air pressure in the process of the mold closure.
  • FIG. 1D shows the vacuum forming method according to the example for forming the resin-molded article including the deep draw portion, and illustrates a state at the completion of preshaping.
  • FIG. 1E shows the vacuum forming method according to the example for forming the resin-molded article including the deep draw portion, and illustrates a state at the completion of the mold closure.
  • FIG. 1F shows the vacuum forming method according to the example for forming the resin-molded article including the deep draw portion, and illustrates a vacuum-clamping completion state.
  • FIG. 2 shows a sample of the resin-molded article including the deep draw portion for demonstrating the vacuum forming method of FIGS. 1A-1F .
  • FIG. 3 is a side view showing the elongation of a thermoplastic resin sheet in preshaping performed on the sample of FIG. 2 .
  • FIG. 4 is a graph which is made by plotting data obtained by measuring wall thicknesses of the above-described sample at a number of points in FIG. 3 .
  • FIG. 5A shows a vacuum forming method for forming a resin-molded article including a deep draw portion, and illustrates a state at the start of mold closure.
  • FIG. 5B shows the vacuum forming method for forming the resin-molded article including the deep draw portion, and illustrates a state in the process of the mold closure.
  • FIG. 5C shows the vacuum forming method for forming the resin-molded article including the deep draw portion, and illustrates a state at the completion of the mold closure.
  • FIG. 5D shows the vacuum forming method for forming the resin-molded article including the deep draw portion, and illustrates a vacuum-clamping completion state.
  • FIG. 6 is a view of an example of the resin-molded article including the deep draw portion formed by the vacuum forming method of FIGS. 5A-5D .
  • FIG. 7 is a cross-sectional view of FIG. 6 .
  • FIGS. 1A to 4 are intended to explain a vacuum forming method of this example.
  • the vacuum forming method of this example is as follows. Specifically, first, a thermoplastic resin sheet 201 softened by heating is pressed into a vacuum forming mold 202 using a core mold 203 to be stretched and deformed at the same time. Then, the thermoplastic resin sheet 201 is brought into intimate contact with the vacuum forming mold 202 by vacuum suction to shape the thermoplastic resin sheet 201 . Thus, a resin-molded article is fabricated.
  • thermoplastic resin sheet 201 in the process of closing the vacuum forming mold 202 and the core mold 203 , at least part of the thermoplastic resin sheet 201 is preshaped using air pressure in such a way that the at least part of the thermoplastic resin sheet 201 is locally stretched and deformed at the same time and thus brought into intimate contact with the core mold 203 . Then, the thermoplastic resin sheet 201 is final-shaped by closing the vacuum forming mold 202 and the core mold 203 and performing vacuum suction through the vacuum forming mold 202 .
  • the at least part of the thermoplastic resin, sheet 201 which is preshaped using air pressure essentially includes a portion (see reference numeral 201 a in FIG. 1B ) which would be locally stretched to a great extent and thin-walled in the case where only final shaping is performed without preshaping and a portion (see reference numeral 201 b in FIG. 1B ) around the foregoing portion, and is an area wider than the above-described portion which would be thin-walled.
  • the at least part of the thermoplastic resin sheet 201 which is preshaped includes, for example, a portion around a deep draw portion (see reference numeral 206 in FIG. 2 ), an undercut portion (see reference numeral 207 in FIG. 2 ), or the like, such as described later, in a vacuum-formed resin-molded article (see reference numeral 208 in FIG. 2 ).
  • preshaping may be performed on portions other than the above portion.
  • FIGS. 1A to 1F show a vacuum forming method according to this example for forming a resin-molded article including a deep draw portion.
  • this vacuum forming method uses the thermoplastic resin sheet 201 softened by heating and a vacuum forming apparatus 210 including the vacuum forming mold 202 (or a cavity mold) and the core mold 203 .
  • thermoplastic resin sheet 201 may be configured to be feedable while being unwound from a roll, though not shown.
  • an unillustrated heating device for heating the thermoplastic resin sheet 201 may be provided at a point along a conveyance path of the thermoplastic resin sheet 201 , with the vacuum forming apparatus 210 , including the vacuum fanning mold 202 and the core mold 203 described above, provided downstream of the heating device. It should be noted that the heating device and the vacuum forming apparatus 210 described above may be provided with unillustrated clamping devices capable of clamping part of the thermoplastic resin sheet 201 .
  • the vacuum forming mold 202 and the core mold 203 are vertically arranged with the thermoplastic resin sheet 201 interposed therebetween, and are configured to be movable toward and away from each other so that the thermoplastic resin sheet 201 may be pressed into the vacuum forming mold 202 using the core mold 203 (mold closure may be performed).
  • the vacuum forming mold 202 has a projecting portion 204 formed therein for forming the deep draw portion
  • the core mold 203 has a recessed portion 205 formed therein for forming the deep draw portion.
  • the projecting portion 204 and the recessed portion 205 are configured to have such sizes and shapes as to be almost fittable to each other with a required space S (see FIG. 1E ) left therebetween.
  • the vacuum forming mold 202 has the recessed portion 205 formed therein, and the core mold 203 has the projecting portion 204 formed therein.
  • the deep draw portion is basically a protruding or recessed portion which has an amount of projection larger than usual and which is therefore difficult to form.
  • the core mold 203 may be provided with a movable plug (see reference numeral 211 in FIG. 1F ).
  • the undercut portion is basically a deeply indented portion which usually makes mold release difficult.
  • the vacuum forming mold 202 has a large number of vacuum holes 202 a formed therein through which vacuum suction can be performed. Moreover, the core mold 203 has a vacuum hole 203 a formed therein through which any one of vacuum suction and air blowing can be performed.
  • the vacuum holes 202 a and the vacuum hole 203 a has a vacuum source 213 (e.g., a vacuum pump, a vacuum tank, or the like) connected thereto.
  • thermoplastic resin sheet 201 is locally stretched and deformed at the same time using air pressure so that the at least part of the thermoplastic resin sheet 201 can be brought into intimate contact with the care mold 203 (preshaping).
  • air pressure to be used is at least one of a positive pressure and a negative pressure.
  • a pressure source 215 e.g., a pressure pump, a pressure tank, or the like
  • one of the pressure source 215 and the above-described vacuum source 213 can be selectively connected to the vacuum holes 202 a of the vacuum forming mold 202 via a selector valve 214 or the like.
  • the vacuum hole 203 a of the core mold 203 is suitable one for preshaping.
  • one or a very small number of vacuum hole(s) 203 a is/are provided at an approximately central position(s) of a bottom surface of the recessed portion 205 .
  • vacuum grooves 203 b are appropriately provided around an aperture(s) of the vacuum hole(s) 203 a .
  • the vacuum grooves 203 b communicate with the vacuum hole 203 a and extend over the entire bottom surface of the recessed portion 205 .
  • the vacuum grooves 203 b include, for example, radial portions 203 b 1 radially extending from the aperture(s) of the vacuum hole(s) 203 a in a cross-like shape or the like and a closed-loop circumferential portion 203 b 2 extending along a peripheral portion of the bottom surface of the recessed portion 205 to connect tip portions of the radial portions 203 b 1 .
  • the core mold 203 has one or a very small number of vacuum hole(s) at an approximately central position(s) of the bottom surface thereof, but the present invention is not limited to this.
  • the vacuum hole(s) only needs/need to allow air to be evacuated from the peripheral portion from which air between the sheet 201 and the core mold 203 is removed last.
  • the vacuum hole(s) may be provided anywhere near the center of the bottom surface of the core mold 203 , or a plurality of vacuum holes may be provided on the periphery of the bottom surface of the core mold 203 .
  • the vacuum grooves 203 b are provided in accordance with the position(s) of the vacuum hole(s) 203 a , but may be unnecessary in some cases.
  • FIG. 1A illustrates a state at the start of mold closure.
  • the thermoplastic resin sheet 201 softened by heating is placed between the vacuum forming mold 202 and the core mold 203 vertically separated from each other by a great distance, and is separated from the vacuum forming mold 202 and the core mold 203 .
  • FIG. 1B illustrates a state in the process of the mold closure.
  • the vacuum forming mold 202 and the core mold 203 are closer to each other than described above, and a top portion of the projecting portion 204 and an edge portion of the recessed portion 205 are at approximately the same level of height and in contact with the thermoplastic resin sheet 201 .
  • a portion 201 a (gap portion) of the thermoplastic resin sheet 201 which is located between the top portion of the projecting portion 204 and the edge portion of the recessed portion 205 is in an unstretched state.
  • thermoplastic resin sheet 201 which is in contact with the top portion of the projecting portion 204 loses some of the heat thereof and becomes more resistant to stretching than other portions. Moreover, in the thermoplastic resin sheet 201 , an opening portion of the recessed portion 205 is almost sealed with a portion 20 c obtained by adding the portions 201 a and 201 b.
  • FIG. 1C shows a state in which at least part (in this case, the portion 201 c described above) of the thermoplastic resin sheet 201 starts to be locally stretched and deformed at the same time using air pressure in the process of closing the vacuum forming mold 202 and the core mold 203 .
  • the relatively wide closed-loop portion 201 c of the thermoplastic resin sheet 201 which seals the opening portion of the recessed portion 205 is deformed toward the inside of the recessed portion 205 in an approximately convex shape as a whole.
  • the air pressure for locally stretching the at least part (in this case, the portion 201 c ) of the thermoplastic resin sheet 201 at least one of the following can be used: the evacuation of air from the recessed portion 205 through the vacuum hole(s) 203 a of the core mold 203 , and the blowing of air from the top portion of the projecting portion 204 toward the thermoplastic resin sheet 201 which is achieved by connecting the pressure source 215 to the vacuum holes 202 a of the vacuum forming mold 202 .
  • the evacuation of air through the vacuum hole(s) 203 a or the blowing of air using the vacuum holes 202 a is preferably started slightly before the above-described state of FIG.
  • the pressure source 215 is connected to the vacuum holes 202 a of the vacuum forming mold 202 so that air may be blown from the top portion of the projecting portion 204 toward the thermoplastic sheet 201 a , but the following may be employed: in addition to the vacuum holes 202 a of the vacuum forming mold 202 , blowing holes (not shown) only for air blowing are provided in the top portion of the vacuum forming mold 202 , and the blowing holes and the above-described pressure source 215 are connected to blow air toward the thermoplastic resin sheet 201 a.
  • This preshaping may be performed while stopping closing the vacuum forming mold 202 and the core mold 203 , or without stopping closing the molds.
  • FIG. 1D illustrates a state at the completion of the preshaping.
  • the closed-loop portion 201 c is approximately fully in intimate contact with the recessed portion 205 of the core mold 203 .
  • the center of the closed-loop portion 201 c comes in intimate contact with the aperture of the vacuum hole(s) 203 a provided at the center of the recessed portion 205 . Then, the region of intimate contact is gradually widened by the evacuation of air through the vacuum grooves 203 b . Finally, a region around the bottom surface of the recessed portion 205 is reached. Thus, the above-described portion 201 c of the thermoplastic resin sheet 201 is gradually deformed. The elongation of each portion of the above-described portion 201 c is according to this way of deformation.
  • FIG. 1E illustrates a state at the completion of the mold closure.
  • the vacuum forming mold 202 and the core mold 203 are closest to each other.
  • the projecting portion 204 and the recessed portion 205 fit to each other with a required space S left therebetween, and the thermoplastic resin sheet 201 is in contact with the core mold 203 .
  • the evacuation or blowing of air for the above-described preshaping is stopped.
  • thermoplastic resin sheet 201 is broadly stretched in advance together with the portion 201 b adjacent thereto by the above-described preshaping, and is therefore thick-walled compared to that in the case where only final shaping is performed without the above-described preshaping. Also, this mold closure does not locally stretch only the above-described portion 201 a to a great extent.
  • FIG. 1F shows a state (vacuum-clamping completion state) in which the thermoplastic resin sheet 201 is in intimate contact with the vacuum forming mold 202 by vacuum suction.
  • the thermoplastic, resin sheet 201 is literally brought into intimate contact with the vacuum forming mold 202 as a whole to be final-shaped.
  • vacuum suction is performed through the vacuum forming mold 202 by connecting the vacuum source 213 to the vacuum holes 202 a of the vacuum forming mold 202 using a selector valve 216 .
  • the start of this vacuum suction is approximately simultaneous with the completion of the mold closure or the stoppage of the evacuation or blowing of air for the above-described preshaping.
  • thermoplastic resin sheet 201 has already have the same shape as the recessed portion 205 together with the portion 201 b adjacent thereto by the preshaping. Accordingly, this final shaping does not stretch only the above-described portion 201 a to a great extent.
  • a movable plug (see reference numeral 211 ) provided in the core mold 203 is operated at this final shaping stage. It should be noted that preshaping performed as in this example changes the elongation of each portion of the thermoplastic resin sheet 201 at the time of final shaping, and increases the wall thickness of each portion. Accordingly, it is possible to reduce such a situation that an undercut portion must be fanned using a movable plug.
  • the resin-molded article thus vacuum-formed by preshaping and final shaping is, for example, used as a covering material (see reference numeral 218 in FIG. 2 ) in foam molding or the like in a subsequent process.
  • FIG. 2 shows a sample of the resin-molded article (covering material 218 ) including the deep draw portion 206 for demonstrating the vacuum forming method of FIGS. 1A-1F .
  • FIG. 3 is a side view showing the elongation of the thermoplastic resin sheet 201 in preshaping performed on the sample of FIG. 2
  • FIG. 4 is a graph which is made by plotting data obtained by measuring wan thicknesses of the above-described sample at a number of points in FIG. 3 .
  • Points in FIG. 3 which indicate the positions of regions of the sample correspond to the points in FIG. 4 , respectively.
  • points 1 to 3 are points in the top portion of the deep draw portion 206
  • points 4 to 8 are points on an inner side surface of the deep draw portion 206
  • point 9 and the following points are points on the bottom surface of the deep draw portion 206 .
  • point 2 is in a central portion of the top portion of the deep draw portion 206
  • point 8 is in a corner portion between the inner side surface and bottom surface of the deep draw portion 206
  • point 16 is in a central portion of the bottom surface of the deep draw portion 206 .
  • thermoplastic resin sheet 201 is preshaped using air pressure in such a way that the at least part of the thermoplastic resin sheet 201 is locally stretched and deformed at the same time and thus brought into intimate contact with the core mold 203 . Then, the thermoplastic resin sheet 201 is final-shaped by closing the vacuum forming mold 202 and the core mold 203 and performing vacuum suction through the vacuum forming mold 202 . Accordingly, the following effects can be obtained.
  • thermoplastic resin sheet 201 since preshaping enables part of the thermoplastic resin sheet 201 to be locally stretched in advance, a portion stretched by the above-described preshaping can be prevented from being greatly stretched at a stroke in final shaping. Accordingly, local wall thinning caused by the local elongation of the thermoplastic resin sheet 201 can be reduced. This can reduce the appearance of wrinkling and deformation marks on, the formed resin article due to local wall thinning, and can reduce the appearance of transparent portions and a decrease in color tone on the formed resin article due to local wall thinning. Moreover, since the local wall thinning of the thermoplastic resin sheet 201 can be reduced, a thick thermoplastic resin sheet 201 does not need to be used in expectation of local wall thinning, and a thinner thermoplastic resin sheet 201 can be used accordingly.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Mechanical Engineering (AREA)
  • Testing Of Short-Circuits, Discontinuities, Leakage, Or Incorrect Line Connections (AREA)
  • Arrangements For Transmission Of Measured Signals (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
US13/982,010 2011-01-28 2012-01-26 Vacuum forming method Abandoned US20130313762A1 (en)

Applications Claiming Priority (3)

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DE102011003308.4A DE102011003308B4 (de) 2011-01-28 2011-01-28 Überwachungsanordnung und Verfahren zur Überwachung einer elektrischen Leitung
DE102011003308.4 2011-01-28
PCT/JP2012/051585 WO2012102316A1 (ja) 2011-01-28 2012-01-26 真空成形方法

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US13/982,011 Active 2032-08-05 US9874584B2 (en) 2011-01-28 2012-01-27 Monitoring arrangement and method for monitoring an electrical line

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US11581624B2 (en) 2016-10-28 2023-02-14 Avery Dennison Retail Information Services Llc RFID tags designed to work on difficult substrates

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EP2870522A2 (de) 2012-07-06 2015-05-13 Micropelt GmbH Mikrocontrolleranordnung
DE102012215400A1 (de) * 2012-08-30 2014-03-06 Siemens Aktiengesellschaft Verfahren zur Bestimmung des Zustandes einer elektrischen Anlage
DE102014101156B4 (de) 2013-01-31 2017-06-14 Hochschule Für Technik Und Wirtschaft Berlin Vorrichtung zum Bestimmen eines Messwerts in einer elektrischen Anlage und Verfahren
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