IT202100020207A1 - Heating and welding mold - Google Patents

Heating and welding mold Download PDF

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Publication number
IT202100020207A1
IT202100020207A1 IT102021000020207A IT202100020207A IT202100020207A1 IT 202100020207 A1 IT202100020207 A1 IT 202100020207A1 IT 102021000020207 A IT102021000020207 A IT 102021000020207A IT 202100020207 A IT202100020207 A IT 202100020207A IT 202100020207 A1 IT202100020207 A1 IT 202100020207A1
Authority
IT
Italy
Prior art keywords
mould
mold
film
plug
face
Prior art date
Application number
IT102021000020207A
Other languages
Italian (it)
Inventor
Andrea Bartoli
Original Assignee
Sarong Spa
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 Sarong Spa filed Critical Sarong Spa
Priority to IT102021000020207A priority Critical patent/IT202100020207A1/en
Priority to PCT/IB2022/056584 priority patent/WO2023007302A1/en
Publication of IT202100020207A1 publication Critical patent/IT202100020207A1/en

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Classifications

    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • 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
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/003—Protecting areas of the parts to be joined from overheating
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/20—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines
    • B29C66/24—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight
    • B29C66/244—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being closed or non-straight said joint lines being non-straight, e.g. forming non-closed contours
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/812—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/8126—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the composition, by the structure, by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps characterised by the intensive physical properties or by the optical properties of the material constituting the pressing elements, e.g. constituting the welding jaws or clamps
    • B29C66/81261—Thermal properties, e.g. thermal conductivity, thermal expansion coefficient
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81427—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single ridge, e.g. for making a weakening line; comprising a single tooth
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/814—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8141—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined
    • B29C66/81431—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the design of the pressing elements, e.g. of the welding jaws or clamps characterised by the surface geometry of the part of the pressing elements, e.g. welding jaws or clamps, coming into contact with the parts to be joined comprising a single cavity, e.g. a groove
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/816—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the mounting of the pressing elements, e.g. of the welding jaws or clamps
    • B29C66/8167—Quick change joining tools or surfaces
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8182—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects
    • B29C66/81821—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the thermal insulating constructional aspects of the welding jaws
    • 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/90—Measuring or controlling the joining process
    • B29C66/91—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux
    • B29C66/914—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux
    • B29C66/9141—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature
    • B29C66/91421—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools
    • B29C66/91423—Measuring or controlling the joining process by measuring or controlling the temperature, the heat or the thermal flux by controlling or regulating the temperature, the heat or the thermal flux by controlling or regulating the temperature of the joining tools using joining tools having different temperature zones or using several joining tools with different temperatures
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42—Component parts, details or accessories; Auxiliary operations
    • B29C49/48—Moulds
    • B29C2049/4856—Mounting, exchanging or centering moulds or parts thereof
    • B29C2049/4858—Exchanging mould parts, e.g. for changing the mould size or geometry for making different products in the same mould
    • 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
    • B29C49/00—Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02—Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06905—Using combined techniques for making the preform
    • B29C49/0691—Using combined techniques for making the preform using sheet like material, e.g. sheet blow-moulding from joined sheets
    • B29C49/06914—Using combined techniques for making the preform using sheet like material, e.g. sheet blow-moulding from joined sheets using parallel sheets as a preform

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Description

Descrizione di invenzione industriale Description of industrial invention

Stampo di riscaldamento e saldatura Heating and welding mold

[0001] L?invenzione riguarda uno stampo di riscaldamento e saldatura, in particolare uno stampo per riscaldare e saldare tra loro zone di un primo film di materiale plastico termoformabile e di un secondo film di materiale plastico termoformabile, utilizzati per la formatura di contenitori, in particolare contenitori per prodotti alimentari, farmaceutici o cosmetici costituiti da una coppia di semi-gusci saldati insieme. [0001] The invention relates to a heating and sealing mould, in particular a mold for heating and sealing together areas of a first film of thermoformable plastic material and of a second film of thermoformable plastic material, used for forming containers, in particular containers for food, pharmaceutical or cosmetic products consisting of a pair of half-shells welded together.

[0002] Per realizzare contenitori ciascuno dei quali sia costituito da una coppia di semigusci saldati insieme lungo un perimetro di saldatura, il primo e il secondo film di materiale plastico termoformabile vengono posti a contatto tra loro e saldati lungo zone corrispondenti ai perimetri di saldatura dei contenitori, tramite due semi-stampi di saldatura, tra i quali vengono condotti i due film di materiale plastico termoformabile. [0002] To make containers each of which is made up of a pair of half-shells welded together along a welding perimeter, the first and second films of thermoformable plastic material are placed in contact with each other and welded along areas corresponding to the welding perimeters of the containers, through two welding semi-moulds, between which the two films of thermoformable plastic material are conducted.

[0003] Per effettuare la saldatura, ciascun film di materiale plastico termoformabile viene normalmente riscaldato su tutta la sua superficie, in una zona compresa tra i due semistampi di saldatura. Ci? pu? essere problematico se il materiale plastico ha una temperatura di saldatura vicina alla temperatura di fusione. [0003] To carry out the sealing, each film of thermoformable plastic material is normally heated over its entire surface, in an area between the two sealing half-moulds. There? can? be problematic if the plastic material has a welding temperature close to the melting temperature.

[0004] In questo caso, infatti, il riscaldamento alla temperatura di saldatura provoca un rammollimento del materiale al punto di farlo afflosciare e appiccicare anche in aree che dovranno essere poi sottoposte a formatura, con il risultato che, dopo la formatura, il contenitore presenter? evidenti difetti superficiali, tali da rovinarne l?estetica e renderlo non commerciabile. [0004] In this case, in fact, the heating to the sealing temperature causes a softening of the material to the point of making it collapse and stick even in areas which will then have to be subjected to forming, with the result that, after forming, the container will present ? obvious surface defects, such as to ruin the aesthetics and make it unmarketable.

[0005] Scopo della presente invenzione ? di fornire uno stampo di riscaldamento e saldatura per riscaldare e saldare zone di un primo foglio di materiale plastico termoformabile con corrispondenti zone di un secondo foglio di materiale plastico termoformabile, senza danneggiare le zone dei fogli di materiale plastico termoformabile non interessate dall?operazione di saldatura, detto stampo dovendo essere di facile ed economica realizzazione. [0005] The purpose of the present invention? to provide a heating and welding mold for heating and welding areas of a first sheet of thermoformable plastic material with corresponding areas of a second sheet of thermoformable plastic material, without damaging the areas of the sheets of thermoformable plastic material not affected by the welding operation said mold having to be easy and cheap to make.

[0006] Lo scopo dell?invenzione ? raggiunto con uno stampo di riscaldamento e saldatura secondo la rivendicazione 1. [0006] The purpose of the invention ? achieved with a heating and welding mold according to claim 1.

[0007] Grazie all?invenzione ? possibile saldare tra loro zone corrispondenti di un primo foglio di materiale plastico termoformabile e di un secondo foglio di materiale plastico termoformabile disposti a contatto l?uno con l?altro, senza danneggiare le zone di entrambi i fogli non interessate dall?operazione di saldatura, in particolare quando la temperatura di saldatura del materiale plastico termoformabile ? vicina alla temperatura di fusione del materiale. [0007] Thanks to the invention ? possible to weld corresponding areas of a first sheet of thermoformable plastic material and of a second sheet of thermoformable plastic material arranged in contact with each other, without damaging the areas of both sheets not affected by the welding operation, in particular when the welding temperature of the thermoformable plastic material ? close to the melting point of the material.

[0008] Ulteriori caratteristiche e vantaggi dell?invenzione risulteranno dalla descrizione che segue di forme di attuazione dell?invenzione puramente esemplificative e non limitative, con riferimento ai disegni allegati in cui: [0008] Further characteristics and advantages of the invention will become apparent from the following description of purely exemplifying and non-limiting embodiments of the invention, with reference to the attached drawings in which:

la Figura 1 ? una vista molto schematica di uno stampo secondo l?invenzione, Figure 1 ? a very schematic view of a mold according to the invention,

la Figura 2 ? una vista in pianta di un semi-stampo dello stampo secondo l?invenzione; la Figura 3 ? una vista prospettica parziale del semi-stampo della Figura 2; Figure 2 ? a plan view of a mold half of the mold according to the invention; Figure 3 ? a partial perspective view of the mold half of Figure 2;

la Figura 4 ? una vista in pianta di un tassello inseribile in cavit? del semi-stampo delle Figure 2 e 3; Figure 4 ? a plan view of a plug that can be inserted in the cavity? of the semi-mold of Figures 2 and 3;

la Figura 5 ? una sezione del tassello della Figura 4, lungo la linea B-B in Figura 4; Figure 5 ? a section of the block of Figure 4, along the line B-B in Figure 4;

la Figura 6 ? una vista prospettica del tassello della Figura 4; Figure 6 ? a perspective view of the plug of Figure 4;

la Figura 7 ? un?altra vista prospettica del tassello della Figura 4; Figure 7 ? another perspective view of the block of Figure 4;

la Figura 8 ? una vista in pianta di una variante del tassello della Figura 4; Figure 8 ? a plan view of a variant of the block of Figure 4;

la Figura 9 ? una sezione del tassello della Figura 8, lungo la linea C-C in Figura 8; Figure 9 ? a section of the block of Figure 8, along the line C-C in Figure 8;

la Figura 10 ? una vista prospettica del tassello della Figura 8; Figure 10 ? a perspective view of the plug of Figure 8;

la Figura 11 ? un?altra vista prospettica del tassello della Figura 8; Figure 11 ? another perspective view of the block of Figure 8;

la Figura 12 ? una vista del semi-stampo della Figura 2 dal quale sono stati rimossi i tasselli illustrati nelle Figure da 4 a 7 o da 8 a 11; Figure 12 ? a view of the mold half of Figure 2 from which the plugs illustrated in Figures 4 to 7 or 8 to 11 have been removed;

la Figura 13 ? una sezione del semi-stampo della Figura 1, lungo la linea A-A in Figura 1. Figure 13 ? a section of the mold half of Figure 1, along line A-A in Figure 1.

[0009] Con riferimento alla Figura 1, uno stampo 1 secondo l?invenzione, per riscaldare e saldare zone di un primo film 4 di materiale plastico termoformabile con corrispondenti zone di un secondo film 5 di materiale plastico termoformabile (nel seguito pi? brevemente primo film 4 e secondo film 5), ? costituito da un primo semi-stampo 2 e da un secondo semi-stampo 3, tra loro sostanzialmente uguali, tra i quali vengono condotti il primo film 4 e il secondo film 5, tra loro allineati e sovrapposti. [0009] With reference to Figure 1, a mold 1 according to the invention, for heating and welding areas of a first film 4 of thermoformable plastic material with corresponding areas of a second film 5 of thermoformable plastic material (hereinafter briefly first film 4 and second film 5), ? consisting of a first half-mould 2 and a second half-mould 3, substantially identical to each other, between which the first film 4 and the second film 5 are led, aligned and superimposed on each other.

[0010] Nella Figura 2 ? illustrato, in una vista in pianta, uno qualsiasi dei due semistampi 2, 3. Nel semi-stampo 2, 3 ? previsto un risalto 6 avente la forma di tre lati del contorno di una pluralit? di contenitori affiancati. Il risalto 6 definisce una serie di cavit? 7, che possono avere tutte la stessa forma e dimensioni. Quando il primo semi-stampo 2 e il secondo semi-stampo 3 vengono accostati, dopo essere stati riscaldati alla temperatura di saldatura del materiale termoplastico del primo film 4 e del secondo film 5, parti del primo film 4 e del secondo film 5, vengono serrate tra i risalti 6 del primo semi-stampo e del secondo semi-stampo e saldate tra loro in modo da definire tre lati del contorno di una pluralit? di contenitori affiancati. Le parti del primo film 4 e del secondo film 5 saldate tra loro circondano delle aree non saldate del primo film 4 e del secondo film 5 in corrispondenza nelle quali pu? essere insufflata aria calda per termoformare i corpi dei contenitori. Le aree non saldate del primo film 4 e del secondo film 5 si trovano in corrispondenza delle cavit? 7 del primo semi-stampo 2 e del secondo semi-stampo 3. [0010] In Figure 2 ? shown, in a plan view, either of the two half-moulds 2, 3. In the half-mould 2, 3 ? provided a projection 6 having the shape of three sides of the contour of a plurality? of side-by-side containers. Bump 6 defines a series of cavities 7, which can all have the same shape and size. When the first semi-mould 2 and the second semi-mould 3 are brought together, after having been heated to the welding temperature of the thermoplastic material of the first film 4 and of the second film 5, parts of the first film 4 and of the second film 5 are clamped between the projections 6 of the first half-mould and of the second half-mould and welded together so as to define three sides of the contour of a plurality? of side-by-side containers. The parts of the first film 4 and of the second film 5 welded together surround unwelded areas of the first film 4 and of the second film 5 in which it can hot air can be blown in to thermoform the container bodies. Are the unwelded areas of the first film 4 and of the second film 5 in correspondence with the cavities? 7 of the first half-mould 2 and of the second half-mould 3.

[0011] In ciascuna delle cavit? 7 ? inserito un tassello 8, 8a avente forma analoga a quella della cavit? 7, in modo da potersi inserire con gioco nella cavit? 7. [0011] In each of the cavities? 7 ? inserted a block 8, 8a having a shape similar to that of the cavity? 7, so that it can be inserted with play in the cavity? 7.

[0012] Nelle Figure da 4 a 7 ? illustrata una prima versione di un tassello contrassegnata con il numero di riferimento 8, mentre nelle Figure da 8 a 11 ? illustrata una seconda versione di un tassello contrassegnata con il numero di riferimento 8a. [0012] In Figures 4 to 7 ? shown a first version of a plug marked with the reference number 8, while in Figures 8 to 11 ? shown is a second version of a plug designated with the reference number 8a.

[0013] Con riferimento alle figure da 4 a 7, ciascun tassello 8 ? fissato al semi-stampo 2, 3, all?interno di una rispettiva cavit? 7, tramite mezzi di fissaggio meccanici, per esempio viti 9, che si inseriscono in fori filettati 10 realizzati su una prima faccia 11 del tassello 8 rivolta verso un fondo 13 della cavit? 7, quando il tassello 8 ? fissato in una rispettiva cavit? 7 del semi-stampo 2, 3. Una seconda faccia 12 del tassello 8, opposta alla prima faccia 11 ? rivolta verso l?esterno della cavit? 7. Quando lo stampo 1 viene chiuso, le seconde facce 12 dei tasselli 8 sono destinate a venire in contatto con zone del primo film 4 o del secondo foglio 5 nelle quali saranno termoformati i corpi dei contenitori. [0013] With reference to figures 4 to 7, each block 8 ? fixed to the semi-mould 2, 3, inside a respective cavity? 7, by means of mechanical fastening means, for example screws 9, which are inserted into threaded holes 10 made on a first face 11 of the plug 8 facing a bottom 13 of the cavity? 7, when tile 8 ? fixed in a respective cavity? 7 of the half-mould 2, 3. A second face 12 of the plug 8, opposite the first face 11? facing the outside of the cavity? 7. When the mold 1 is closed, the second faces 12 of the blocks 8 are intended to come into contact with areas of the first film 4 or of the second sheet 5 in which the bodies of the containers will be thermoformed.

[0014] Sul fondo 13 di ciascuna cavit? 7 sono praticati dei fori 17 attraverso i quali sono inserite le viti 9 destinate al fissaggio dei tasselli 8. [0014] On the bottom 13 of each cavity? 7 holes 17 are made through which the screws 9 intended for fixing the dowels 8 are inserted.

[0015] Ciascun tassello 8 pu? essere realizzato in un secondo materiale che ha un coefficiente di trasmissione del calore minore del coefficiente di trasmissione del calore di un primo materiale con il quale ? realizzato il semi-stampo 2, 3. Per effetto del minore coefficiente di trasmissione del calore, quando il semi-stampo 2, 3 ? riscaldato, il tassello 8, la cui prima faccia 11 ? a contatto con il semi-stampo 2, 3, in corrispondenza del fondo 13 della cavit? 7 nella quale ? inserito il tassello 8 (Figura 12), risulta pi? freddo del semistampo 2, 3. Pertanto, quando il semi-stampo 2, 3 viene riscaldato alla temperatura di saldatura del materiale termoplastico del primo film 4 e del secondo film 5, i tasselli 8 avranno una temperatura inferiore a quella del resto del semi-stampo 2, 3, in particolare le seconde facce 12 dei tasselli avranno una temperatura inferiore alla temperatura del risalto 6. [0015] Each piece 8 can? be made of a second material which has a lower heat transfer coefficient than the heat transfer coefficient of a first material with which it is the semi-mould 2, 3 has been made. Due to the lower heat transfer coefficient, when the semi-mould 2, 3 is? heated, the plug 8, whose first face 11 ? in contact with the semi-mould 2, 3, at the bottom 13 of the cavity? 7 in which? inserted plug 8 (Figure 12), is it more? cold of the half-mould 2, 3. Therefore, when the half-mould 2, 3 is heated to the welding temperature of the thermoplastic material of the first film 4 and of the second film 5, the blocks 8 will have a lower temperature than the rest of the half-mold mold 2, 3, in particular the second faces 12 of the blocks will have a lower temperature than the temperature of the boss 6.

[0016] Grazie alla temperatura delle seconde facce 12 dei tasselli 8 inferiore a quella a quella del risalto 6, le parti del primo film 4 e del secondo film 5, che si trovano in corrispondenza dei tasselli 8, si scaldano meno, rispetto alle parti che si trovano in corrispondenza del risalto 6, e non aderiscono tra loro, cos? da garantire che, al momento della formatura dei corpi dei contenitori, questi potranno essere ottenuti senza difetti che possano comprometterne l?estetica e, quindi, la commerciabilit?. [0016] Thanks to the temperature of the second faces 12 of the blocks 8 lower than that of the prominence 6, the parts of the first film 4 and of the second film 5, which are located in correspondence with the blocks 8, heat up less than the parts which are in correspondence with the prominence 6, and do not adhere to each other, cos? to guarantee that, at the moment of forming the bodies of the containers, these can be obtained without defects that could compromise their aesthetics and, therefore, their marketability.

[0017] La trasmissione del calore tra il semi-stampo 2, 3 e i tasselli pu? essere regolata anche variando la superficie di contatto tra i tasselli e il semi-stampo 2, 3, pi? precisamente riducendo la superficie di contatto tra la prima faccia 11 di ciascun tassello e il fondo 13 della corrispondente cavit? 7. In questo caso i tasselli possono essere realizzati con lo stesso materiale con il quale sono realizzati i semi-stampi 2, 3. [0017] The heat transmission between the semi-mould 2, 3 and the inserts can be adjusted also by varying the contact surface between the plugs and the semi-mould 2, 3, pi? precisely reducing the contact surface between the first face 11 of each block and the bottom 13 of the corresponding cavity? 7. In this case the plugs can be made with the same material with which the half-moulds 2, 3 are made.

[0018] Nelle Figure da 8 a 11 ? illustrata una seconda versione 8a di un tassello che presenta una superficie di contatto con il semi-stampo 2, 3, inferiore alla superficie di contatto tra un tassello 8 e il semi-stampo 2, 3. [0018] In Figures 8 to 11 ? shown is a second version 8a of a plug which has a contact surface with the semi-mould 2, 3, smaller than the contact surface between a plug 8 and the semi-mould 2, 3.

[0019] Un tassello 8a presenta in una prima faccia 11a una rientranza 14 di forma sostanzialmente rettangolare, sul cui fondo 15 sono praticati dei fori filettati 10a nei quali si inseriscono le viti di fissaggio 9 tramite le quali il tassello 8a ? fissato al fondo 13 di una rispettiva cavit? 7 del semi-stampo 2, 3. Per effetto della rientranza 14, la superficie di contatto tra il tassello 8a e il fondo 13 della cavit? 7 ? inferiore alla superficie della prima faccia 11a ed ? limitata sostanzialmente al bordo 16 della rientranza 14, mentre, nel caso del tassello 8 illustrato nelle Figure da 4 a 7, la superficie di contatto tra il tassello 8 e il fondo 13 della rispettiva cavit? 7 ? pari alla superficie della prima faccia 11. [0019] A plug 8a has in a first face 11a a substantially rectangular recess 14, on the bottom 15 of which threaded holes 10a are made into which the fixing screws 9 are inserted through which the plug 8a ? fixed to the bottom 13 of a respective cavity? 7 of the semi-mould 2, 3. Due to the effect of the recess 14, the contact surface between the block 8a and the bottom 13 of the cavity? 7 ? lower than the surface of the first face 11a and ? substantially limited to the edge 16 of the recess 14, while, in the case of the plug 8 shown in Figures 4 to 7, the contact surface between the plug 8 and the bottom 13 of the respective cavity? 7 ? equal to the surface of the first face 11.

[0020] Grazie a questo accorgimento e/o scegliendo opportunamente il materiale dei tasselli 8a, in modo che abbia un coefficiente di trasmissione del calore sensibilmente inferiore al coefficiente di trasmissione del calore del materiale del semi-stampo 2, 3, ? possibile ridurre la quantit? di calore che giunge al tassello 8a quando lo stampo 1 viene riscaldato, in modo che una sua seconda faccia 12a, opposta alla prima faccia 11 e rivolta verso l?esterno della rispettiva cavit? 7, abbia una temperatura inferiore anche di 10-15? C rispetto alla temperatura del risalto 6. [0020] Thanks to this expedient and/or by suitably choosing the material of the blocks 8a, so that it has a heat transmission coefficient significantly lower than the heat transmission coefficient of the material of the half-mould 2, 3, ? is it possible to reduce the quantity? of heat which reaches the block 8a when the mold 1 is heated, so that a second face 12a thereof, opposite the first face 11 and facing towards the outside of the respective cavity? 7, has a lower temperature of even 10-15? C compared to the temperature of the prominence 6.

[0021] Ci? garantisce ulteriormente che le zone del primo film 4 e del secondo film 5 che vengono a contatto con i tasselli 8a, quando lo stampo 1 viene chiuso, non possano rammollirsi e aderire tra loro, in modo che i corpi dei contenitori che saranno successivamente realizzati tramite termoformatura non presentino difetti. [0021] There? further guarantees that the areas of the first film 4 and of the second film 5 which come into contact with the blocks 8a, when the mold 1 is closed, cannot soften and adhere to each other, so that the bodies of the containers which will subsequently be made using thermoforming have no defects.

[0022] Nella Figura 13 ? illustrata una variante di uno stampo secondo l?invenzione. In questa variante, tra la prima faccia 11 di ciascun tassello 8 e il fondo 13 della rispettiva cavit? 7 del semi-stampo 2, 3, nella quale ? inserito il tassello 8, sono disposti degli elementi distanziatori 18 [0022] In Figure 13 ? illustrated a variant of a mold according to the invention. In this variant, between the first face 11 of each block 8 and the bottom 13 of the respective cavity? 7 of the half-mould 2, 3, in which ? inserted the block 8, spacer elements 18 are arranged

[0023] Gli elementi distanziatori 18 sono preferibilmente realizzati con un materiale termicamente isolante o, comunque, con un materiale avente un coefficiente di trasmissione del calore inferiore al coefficiente di trasmissione del calore del materiale con il quale ? realizzato il semi-stampo 2, 3. [0023] The spacer elements 18 are preferably made with a thermally insulating material or, in any case, with a material having a heat transmission coefficient lower than the heat transmission coefficient of the material with which it is used. semi-mould 2, 3 made.

[0024] Gli elementi distanziatori 18 impediscono un contatto diretto tra la prima faccia 11 di un tassello 8 e il fondo 13 di una rispettiva cavit? 7, nella quale ? inserito il tassello 8. [0024] The spacer elements 18 prevent direct contact between the first face 11 of a block 8 and the bottom 13 of a respective cavity? 7, in which ? plug 8 inserted.

[0025] Ciascun elemento distanziatore 18 pu? avere la forma di un anello dotato di foro centrale 19 che consente di inserire l?elemento distanziatore 18 sullo stelo di una rispettiva vite 9, quando il rispettivo tassello 8 viene fissato nella cavit? 7. [0025] Each spacer element 18 can have the shape of a ring provided with a central hole 19 which allows the spacer element 18 to be inserted on the stem of a respective screw 9, when the respective dowel 8 is fixed in the cavity? 7.

[0026] Grazie alla presenza degli elementi distanziatori, si ha solo un contatto indiretto tra un tassello 8 e il fondo della rispettiva cavit? 13, oltretutto su una superficie molto minore della superficie della prima faccia 11 del tassello, corrispondente alla superficie complessiva degli elementi distanziatori 18. [0026] Thanks to the presence of the spacer elements, there is only indirect contact between a block 8 and the bottom of the respective cavity. 13, moreover on a much smaller surface than the surface of the first face 11 of the block, corresponding to the overall surface of the spacer elements 18.

[0027] Ci? rende possibile ridurre la quantit? di calore che giunge al tassello 8 quando lo stampo 1 viene riscaldato, in modo che una sua seconda faccia 12, opposta alla prima faccia 11 e rivolta verso l?esterno della rispettiva cavit? 7, abbia una temperatura inferiore anche di 10-15? C rispetto alla temperatura del risalto 6, cos? da garantire che le zone del primo film 4 e del secondo film 5 che vengono a contatto con i tasselli 8, quando lo stampo 1 viene chiuso, non possano rammollirsi e aderire tra loro, in modo che i corpi dei contenitori che saranno successivamente realizzati tramite termoformatura non presentino difetti. [0027] There? makes it possible to reduce the amount? of heat which reaches the block 8 when the mold 1 is heated, so that a second face 12 thereof, opposite the first face 11 and facing towards the outside of the respective cavity? 7, has a lower temperature of even 10-15? C with respect to the temperature of the prominence 6, cos? to ensure that the areas of the first film 4 and of the second film 5 which come into contact with the blocks 8, when the mold 1 is closed, cannot soften and adhere to each other, so that the bodies of the containers which will subsequently be made using thermoforming have no defects.

Claims (12)

RIVENDICAZIONI 1. Stampo (1) di riscaldamento e saldatura comprendente un primo semi-stampo (2) e un secondo semi-stampo (3) configurati per riscaldare un primo film (4) di materiale plastico termoformabile e un secondo film (5) di materiale plastico termoformabile condotti tra detto primo semi-stampo (2) e detto secondo semi-stampo (3) e per saldare tra loro zone di detto primo film (4) e di detto secondo film (5), in cui detto primo semistampo (2) e detto secondo semi-stampo (3) comprendono un rispettivo risalto (6) configurato per saldare tra loro dette zone di detto primo film (4) e di detto secondo film (5), caratterizzato dal fatto che comprende inoltre una pluralit? di cavit? (7) in ciascuna delle quali ? inserito un tassello (8; 8a), in cui ciascun tassello (8; 8a) ? fissato a un fondo (13) di una rispettiva cavit? (7).1. Heating and sealing mold (1) comprising a first semi-mould (2) and a second semi-mould (3) configured to heat a first film (4) of thermoformable plastic material and a second film (5) of material thermoformable plastic ducts between said first half-mould (2) and said second half-mould (3) and for sealing together regions of said first film (4) and said second film (5), in which said first half-mould (2 ) and said second half-mould (3) comprise a respective protrusion (6) configured to weld together said regions of said first film (4) and of said second film (5), characterized in that it also comprises a plurality of cavities? (7) in each of which ? inserted a plug (8; 8a), in which each plug (8; 8a) ? fixed to a bottom (13) of a respective cavity? (7). 2. Stampo (1) secondo la rivendicazione 1, in cui una prima faccia (11; 11a) di detto tassello (8; 8a) ? in contatto con detto fondo (13) quando il tassello (8; 8a) ? inserito nella rispettiva cavit? (7).2. Mold (1) according to claim 1, wherein a first face (11; 11a) of said plug (8; 8a) is in contact with said bottom (13) when the block (8; 8a) ? inserted in the respective cavity? (7). 3. Stampo (1) secondo la rivendicazione 1, in cui detto tassello (8; 8a) ? conformato in modo da inserirsi con gioco nella rispettiva cavit? (7).3. Mold (1) according to claim 1, wherein said plug (8; 8a) is shaped so as to fit with play in the respective cavity? (7). 4. Stampo (1) secondo la rivendicazione 2, oppure 3, in cui ciascun tassello (8; 8a) ? fissato al fondo (13) della rispettiva cavit? (7) tramite mezzi di fissaggio meccanici (9).4. Mold (1) according to claim 2, or 3, wherein each block (8; 8a) is fixed to the bottom (13) of the respective cavity? (7) by means of mechanical fastening means (9). 5. Stampo (1) secondo la rivendicazione 4, in cui detti mezzi di fissaggio meccanici comprendono viti (9) conformate per inserirsi in fori filettati (10; 10a) praticati in detta prima faccia (11; 11a).5. Mold (1) according to claim 4, wherein said mechanical fastening means comprise screws (9) shaped to fit into threaded holes (10; 10a) made in said first face (11; 11a). 6. Stampo (1) secondo una delle rivendicazioni precedenti, in cui detto tassello (8; 8a) ? realizzato con un secondo materiale diverso da un primo materiale con il quale sono realizzati il primo semi-stampo (2) e il secondo semi-stampo (3), in cui detto secondo materiale ha un coefficiente di trasmissione del calore inferiore a un coefficiente di trasmissione del calore di detto primo materiale.6. Mold (1) according to one of the preceding claims, wherein said block (8; 8a) is made with a second material different from a first material with which the first half-mould (2) and the second half-mould (3) are made, in which said second material has a coefficient of heat transmission lower than a coefficient of heat transfer of said first material. 7. Stampo (1) secondo una delle rivendicazioni precedenti, in cui tra la prima faccia (11) di detto tassello (8) e il fondo (13) della cavit? (7) del primo semi-stampo (2) o del secondo semi-stampo (3), nella quale ? inserito un tassello (8), sono disposti elementi distanziatori (18).7. Mold (1) according to one of the preceding claims, wherein between the first face (11) of said plug (8) and the bottom (13) of the cavity? (7) of the first half-mould (2) or of the second half-mould (3), in which ? inserted a dowel (8), spacer elements (18) are arranged. 8. Stampo (1) secondo la rivendicazione 7, in cui gli elementi distanziatori (18) sono realizzati con un materiale termicamente isolante o con un materiale avente un coefficiente di trasmissione del calore inferiore al coefficiente di trasmissione del calore del materiale con il quale sono realizzati il primo semi-stampo (2) e il secondo semistampo (3).The mold (1) according to claim 7, wherein the spacer elements (18) are made of a thermally insulating material or of a material having a heat transfer coefficient lower than the heat transfer coefficient of the material with which they are made the first half-mould (2) and the second half-mould (3). 9. Stampo 1, secondo la rivendicazione 7, oppure 8, in cui ciascun elemento distanziatore (18) ha la forma di anello con un foro centrale (19).The mold 1, according to claim 7, or 8, wherein each spacer element (18) has the shape of a ring with a central hole (19). 10. Stampo (1) secondo una delle rivendicazioni da 2 a 6, in cui detta prima faccia (11a) ? dotata di una rientranza (14).10. Mold (1) according to one of claims from 2 to 6, wherein said first face (11a) ? equipped with a recess (14). 11. Stampo (1) secondo la rivendicazione 7, in cui detti fori filettati (10a) sono praticati in un fondo (15) di detta rientranza (14).The mold (1) according to claim 7, wherein said threaded holes (10a) are made in a bottom (15) of said recess (14). 12. Stampo (1) secondo una delle rivendicazioni precedenti, in cui detto risalto (6) circonda dette cavit? (7) su tre lati. 12. Mold (1) according to one of the preceding claims, wherein said projection (6) surrounds said cavities (7) on three sides.
IT102021000020207A 2021-07-28 2021-07-28 Heating and welding mold IT202100020207A1 (en)

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2212089A1 (en) * 1972-03-13 1973-10-04 Wilhelm Heisig Plastics welder/cutter - for superimposed thermoplastic and non-thermoplastic films
EP0719630A1 (en) * 1994-12-23 1996-07-03 TRIMAT S.r.l. Method for producing containers, such as bottles or the like, with film of thermoplastic synthetic material, and apparatus for carrying out the method

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2212089A1 (en) * 1972-03-13 1973-10-04 Wilhelm Heisig Plastics welder/cutter - for superimposed thermoplastic and non-thermoplastic films
EP0719630A1 (en) * 1994-12-23 1996-07-03 TRIMAT S.r.l. Method for producing containers, such as bottles or the like, with film of thermoplastic synthetic material, and apparatus for carrying out the method

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