EP0620780A1 - Procede et dispositif de decoupage de corps moules - Google Patents

Procede et dispositif de decoupage de corps moules

Info

Publication number
EP0620780A1
EP0620780A1 EP93923560A EP93923560A EP0620780A1 EP 0620780 A1 EP0620780 A1 EP 0620780A1 EP 93923560 A EP93923560 A EP 93923560A EP 93923560 A EP93923560 A EP 93923560A EP 0620780 A1 EP0620780 A1 EP 0620780A1
Authority
EP
European Patent Office
Prior art keywords
punching
strip
film web
feed direction
shaped bodies
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.)
Withdrawn
Application number
EP93923560A
Other languages
German (de)
English (en)
Inventor
Burkhard Metzger
Ulrich Merz
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.)
Krupp Bellaform Maschinenbau GmbH
Original Assignee
Krupp Bellaform Maschinenbau GmbH
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
Application filed by Krupp Bellaform Maschinenbau GmbH filed Critical Krupp Bellaform Maschinenbau GmbH
Publication of EP0620780A1 publication Critical patent/EP0620780A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/40—Cutting-out; Stamping-out using a press, e.g. of the ram type
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/01—Means for holding or positioning work
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • 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
    • B29C51/44—Removing or ejecting moulded articles
    • B29C51/445—Removing or ejecting moulded articles from a support after moulding, e.g. by cutting
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
    • B26F1/00—Perforating; Punching; Cutting-out; Stamping-out; Apparatus therefor
    • B26F1/38—Cutting-out; Stamping-out
    • B26F1/44—Cutters therefor; Dies therefor
    • B26F2001/449—Cutters therefor; Dies therefor for shearing, e.g. with adjoining or abutting edges
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/009—Shaping techniques involving a cutting or machining operation after shaping
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7132—Bowls, Cups, Glasses

Definitions

  • the invention relates to a method for punching out thin-walled molded articles made of thermoplastic material from a film web into which the molded articles are molded next to one another in the feed direction and perpendicular to the feed direction.
  • the invention also relates to a device for punching out thin-walled shaped bodies according to the preamble of claim 8.
  • thermoforming machines For the production of disposable tableware, e.g. Cups, bowls, plates or the like made of thermoplastic material are used in offline thermoforming machines, in which a thin strip of thermoplastic material is continuously poured from a slot die with an upstream extruder into which the desired shaped articles are molded in a deep-drawing station. As a rule, several rows, each with several shaped bodies arranged side by side, are produced simultaneously per work cycle. These moldings are also punched out together in a downstream punching device.
  • the film material cools behind the thermoforming station, causing material shrinkage, which leads to the moldings, when they reach the punching device, they are not exactly where the punching tool is intended.
  • this shrinkage error is 0.5 to 2.5%, which can lead to a transverse displacement of 3.6 to 15 mm with the usual film widths. This means that the shaped bodies are not punched out exactly, which is most evident in the case of the outer shaped bodies.
  • the stretch mark had already solidified to such an extent that there was little transverse mobility, so that additional centering did not bring the desired success.
  • the shaped bodies are still connected to one another during centering, so that the centering processes have a negative influence on one another.
  • the object of the invention is therefore a method and a device with which the shaped bodies can be punched out precisely despite the shrinkage of the film web.
  • the film web is punched in at least one point between two moldings molded next to one another perpendicular to the feed direction by punching out a film strip extending in the feed direction severed. Only when this film strip is punched out are the shaped bodies centered and punched out after centering.
  • the moldings are already pre-centered before and / or during the severing of the film web.
  • the moldings are then completely centered during and / or after severing the film web.
  • it is preferably smoothed in the region between the shaped bodies. This has the advantage that the moldings are moved in the transverse direction before the pre-centering, so that the subsequent centering process can be accelerated even further.
  • the fact that the film web is guided in the punching device as smoothly as possible also contributes to this. So that the film web does not come into contact with the punching tools and could be slowed down or get stuck during feed, the film web is preferably guided at a distance from the punching tools until the shaped bodies are punched out.
  • the device for punching out the thin-walled shaped articles provides at least one strip punching tool for punching out a strip of film from the film web between two shaped articles arranged perpendicular to the direction of advance.
  • the strip punching tool is guided in such a way that it cuts through the film web before punching out the shaped bodies. Since the punching device is matched to the intermittent feed of the thermoforming machine, the movement of the strip punching tool must also be set such that the film strip is punched out between the shaped bodies before the shaped bodies are punched out. Because the strip punch tool integrated into the punching device, a separate drive for the strip punching tool is not necessary.
  • the strip punching tool can be arranged between two punching tools arranged next to one another perpendicular to the feed direction.
  • the strip punching tool can be guided in the punching device in such a way that it cuts through the film web before punching out the moldings and has withdrawn again into the starting position.
  • the sequence of movements it has proven to be advantageous if the strip punching tool has not yet returned to its starting position during the centering and punching out of the shaped bodies, but is still located between the film web strips.
  • the punching tool has an undercut on both sides perpendicular to the direction of advance of the film web above the cutting edge, which is preferably at least 10% of the strip width. Only when the punching tools are withdrawn after the punching process is the strip punching tool then also moved back to its starting position.
  • the length of the strip punching tool is matched to the dimensions of the punching tool so that no connecting webs remain between the film web strips.
  • Strip punching tool has at least a length which corresponds to the extent of the punching tool or - if several punching tools are arranged one behind the other in the feed direction - the total length of these punching tools. In the case of thick and / or stiff foils, it is advantageous to arrange the strip punching tool in the feed direction in front of the punching devices.
  • the freely movable film web strips are longer than in the previously described embodiment, so that a larger lever arm is available for centering.
  • a lower stripper plate which is displaceable in the direction of movement of the punching tool is assigned to the lower punching tool.
  • the lower stripper plate is held in the open state of the punching device by means of at least one spring element in a position projecting beyond the lower punching tool.
  • the incoming film web is guided at a distance from the lower punching tool before the shaped bodies are punched out. Due to the spring mounting of the lower stripper plate, this first is moved back when the punching device is closed, so that the upper and lower punching tools can interlock.
  • the lower scraper plate moves back into its starting position and thereby scrapes off the scrap skeleton from the lower punching tool, which can thus be transported away unhindered.
  • the centering element is arranged displaceably in the upper punching tool, the centering element being assigned a spring element which presses the centering element in the direction of the lower punching tool, the force of the spring element being set lower than the force of the spring element of the lower stripper plate.
  • the coordination of the spring elements ensures that when Centering process, the lower stripper plate is not yet pushed back, so that the film web is still guided at a distance from the lower punching tool. The centering of the molded body can thus take place without hindrance without the film web being braked by contact with the lower punching tool.
  • the upper punch is preferably assigned an upper stripper plate which is displaceable in the direction of movement of the punch and which is held in the open state of the punch by means of at least one spring element in a protruding manner above the upper punch, the force of the associated spring element being greater than the spring force of the spring element of the lower stripper plate and / or the force of the spring element of the centering element.
  • a centering cone is preferably used as the centering element, which engages over the molded body when the punching device is closed. This prevents that when the punching device is closed, due to the not yet centered shaped bodies, they already come into contact with the upper punching tool and are therefore damaged.
  • FIGS. 1 to 4 the punching device in vertical section in four successive punching phases
  • Figure 5 is a plan view of a portion of a
  • 6a and b show two side views of the strip punching tool.
  • the punching device 1 is shown in vertical section, which has two punching devices, each with an upper punching tool 140, 141 and a lower punching tool 240, 241. 1 shows the punching device 1 in the open state, so that the film web 2 with the shaped bodies 3 and 4, which are designed as cups, can run into the punching device.
  • the upper punching tools 140, 141 are fastened to a common base body 110 which can be moved up and down in cycles in the vertical direction.
  • a centering cone 160, 161 is arranged in each case vertically displaceably within the upper punching tools 140, 141, a spring element 170, 171, which presses the centering cone downward, being provided between the centering cone 160, 161 and the base body 110. In the position shown here, the centering cone 160, 161 projects downward from the upper punching tool 140, 141.
  • the upper part 100 of the punching device 1 has an upper wiper plate 120 which is connected to the base body 110 via spring elements 130, 131.
  • the upper scraper plate is in the illustration shown here opposite the upper punching tool 140, 141 and the centering cone 160, 161 downwards.
  • the lower part 200 has lower punching tools 240, 241 corresponding to the upper punching tools 140, 141, which are fastened to a base plate 210.
  • the lower part 200 has a lower wiper plate 220, which is mounted on the base plate 210 by means of spring elements 230, 231 so as to be displaceable in the vertical direction.
  • the lower stripper plate 220 projects upwards relative to the lower punching tools 240, 241, so that the film web 2, which rests on the lower stripper plate 220, does not come into contact with the lower punching tools 240, 241.
  • Two fixed abutments 250, 251 are arranged to the side of the lower stripper plate 220, which protrude slightly upwards relative to the lower stripper plate 220, so that when the upper part 100 is lowered, the upper stripper plate 120 can rest on these abutments 250, 251, without the between the upper stripper plate 120 and lower stripper plate 220 located film web 2 to clamp.
  • a strip punch 150 is fastened to the base body between the upper punch 140, 141.
  • the lower stripper plate 220 has a corresponding recess in the area of the strip punching tool 150, so that when the punching device 1 is closed, the strip punching tool 150 can penetrate the film web 2 unhindered.
  • FIG. 2 the punching device 1 shown in FIG. 1 is shown in the phase in which the film strip 12 by means of the
  • Strip punching tool 150 is punched out.
  • the punching device 1 is closed to such an extent that the upper stripper plate 120 on the abutments 250, 251 rests and the centering cones 160, 161 have gripped the shaped bodies 3, 4.
  • Strip punching tool 150 has not yet completely penetrated the film web 2, but in this state the film web has already been severed so that the centering cones 160, 161 can precenter the moldings 3, 4. Due to the space between the upper stripper plate 120 and the lower stripper plate 220, the film web is freely movable perpendicular to the feed direction.
  • the spring elements 130, 131 are compressed in the illustration shown here compared to the illustration shown in FIG. 1.
  • the strip punching tool 150 has penetrated completely through the film web 2, so that the film web is now in the area of the undercuts 151, 152 of the strip punching tool 150.
  • the centering cones 160, 161 have completely gripped the moldings 3, 4 and have carried out the final centering of the moldings. Due to the undercuts 151, 152 of the strip punch 150, the strip punch 150 does not hinder the centering process.
  • the spring elements 130, 131 are further compressed compared to the illustration shown in FIG. 2.
  • the upper part 100 has approached the lower part 200 so far that the upper punching tools 140, 141 interact with the lower punching tools 240, 241.
  • the lower stripper plate 220 is pressed down so far that the film web now comes into contact with the lower punching tools 240, 241.
  • the centering cones 160, 161 are below in their position shown in FIG. 3 Compression of the spring elements 170, 171 remained.
  • the shaped bodies 3, 4 are ejected from the punching device 1 by means of an ejector (not shown).
  • the lower stripper plate 220 moves upward and strips the remaining scrap skeleton from the lower punching tools 240, 241.
  • the upper stripper plate 120 also detaches from the abutments 250, 251, slides along the upper punching tools 140, 141 and thus strips down the film material which may have got stuck on the upper punching tools 140, 141.
  • FIG. 5 shows the top view of a film web 2, into which rows each with seven shaped bodies 3a to 9a, 3b to 9b are molded.
  • the rows 15 and 16 of the shaped bodies 3a to 9a and 3b to 9b are those rows which are located in the area of the punching devices for punching out the shaped bodies.
  • the strip punching tools 150 are arranged from the left to the right between the second and third or fifth and sixth shaped bodies in the feed direction in front of the punching tools. Each time the film web 2 is fed into the area of the punching devices, the film strip is already punched out, so that the cuts 10 and 11 are present.
  • the severing 10 and 11 are lengthened by punching out a further film strip by means of the strip punching tools 150.
  • the mobility of the three film web strips in the area of the punching tools is thus improved due to the longer lever travel.
  • a strip punching tool is shown in two views in FIGS. 6a and b.
  • the strip punching tool has two undercuts 151, 152, which are related to the width of the
  • Strip punch tool 150 amount to at least 10%.
  • the undercuts 151, 152 extend upward as far as the strip punching tool 150 dips into the film web until the centering and punching process of the shaped bodies is complete.
  • 6b shows the strip punch 150 in a side view, the length of the strip punch 150 being adapted to the length of the punching tools arranged one behind the other for punching out the shaped bodies.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Perforating, Stamping-Out Or Severing By Means Other Than Cutting (AREA)

Abstract

Après la réalisation de corps moulés (3) à paroi fine, en matière thermoplastique, les corps moulés (3) ne peuvent être découpés avec précision en raison d'un retrait de la bande de film. C'est la raison pour laquelle avant de procéder au découpage des corps moulés (3), on sépare la bande de film (2) en au moins un point situé entre deux corps moulés, perpendiculairement au sens d'avancement, par découpage d'une section de film (12) s'étendant dans le sens d'avancement. Les corps moulés (2), qui peuvent maintenant se déplacer, sont ensuite centrés, puis ils sont découpés. Le dispositif comprend au moins un outil de découpage des bandes (150) destiné à découper une section de film (12). Cet outil de découpage de bandes (150) est guidé de manière à séparer la bande de film (2) avant le découpage des corps moulés.
EP93923560A 1992-10-27 1993-10-27 Procede et dispositif de decoupage de corps moules Withdrawn EP0620780A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19924236152 DE4236152A1 (de) 1992-10-27 1992-10-27 Verfahren und Vorrichtung zum Ausstanzen von Formkörpern
DE4236152 1992-10-27
PCT/EP1993/002972 WO1994009967A1 (fr) 1992-10-27 1993-10-27 Procede et dispositif de decoupage de corps moules

Publications (1)

Publication Number Publication Date
EP0620780A1 true EP0620780A1 (fr) 1994-10-26

Family

ID=6471402

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93923560A Withdrawn EP0620780A1 (fr) 1992-10-27 1993-10-27 Procede et dispositif de decoupage de corps moules

Country Status (4)

Country Link
EP (1) EP0620780A1 (fr)
BR (1) BR9305686A (fr)
DE (1) DE4236152A1 (fr)
WO (1) WO1994009967A1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4438258C1 (de) * 1994-10-26 1996-03-07 Melzer Maschinenbau Gmbh Verfahren zum Ausstanzen von Kunststoffkarten aus einer Substrat-Laminatbahn
CN104128955A (zh) * 2014-07-17 2014-11-05 姚丽娟 一种型材切割机构
CN110103276B (zh) * 2019-05-30 2020-11-24 义乌市根号三科技有限公司 一种眼贴剂挤压切割装置

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL240128A (fr) * 1957-11-08
DE1479752A1 (de) * 1960-07-25 1969-04-03 Lindemann Maschfab Gmbh Verfahren und Vorrichtung um aus einer thermoplastischen Kunststoff-Folie geformte Profile auszustanzen
US3475526A (en) * 1965-12-21 1969-10-28 Jingo Seto Method for cutting-forming of thermoplastic sheets
US3523474A (en) * 1968-04-15 1970-08-11 Phillips Petroleum Co Precision trimming of thermoformed parts
US3685251A (en) * 1970-03-26 1972-08-22 Mahaffy & Harder Eng Co Automatic packaging apparatus with improved means for cutting and contour trimming of packages
DE2039403A1 (de) * 1970-08-08 1972-02-17 Formseal Beratungs Vertriebs U Vorrichtung zum Austrennen von Formlinge aus einer Kunststoff-Folienbahn
DE2351069C3 (de) * 1973-10-11 1984-10-11 Tabur, Marcel Jean, Yvré-l'Evêque, Vaux Maschine zum Aufteilen von Folien, Platten, Tabletts oder anderen Gegenständen in Quer- und Längsrichtung
CA1171226A (fr) * 1980-11-12 1984-07-24 Donald W. Myers Methode et dispositif de demoulage d'articles faconnes a chaud
EP0305714A3 (fr) * 1983-10-06 1989-09-06 Servichem AG Dispositif pour mouler des objets dans un matériau thermoplastique
DE3830889A1 (de) * 1988-09-10 1990-03-22 Bellaplast Gmbh Inline-thermoformmaschine

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9409967A1 *

Also Published As

Publication number Publication date
DE4236152A1 (de) 1994-04-28
BR9305686A (pt) 1996-12-31
WO1994009967A1 (fr) 1994-05-11

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