# US 7,744,516 B2 · Machine for the production of bags made of heat-sealed alveolar or foamed thermoplastic material

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- Number: US 7,744,516 B2
- Document ID: US7744516B2
- Status: Granted
- Kind: B2
- Application number: 12/127,160
- Filed: 2008-05-27
- Published: 2008-11-27
- Granted: 2010-06-29
- Earliest claimed: 2007-05-24
- Assignees: Offmar S.R.L.
- Inventors: Emiliano Matta; Luigi Matta
- Web page: https://patentgrep.com/patent/US7744516B2

## CPC

- B29C 65/7457: {comprising a perforating tool}
- B29C 65/18: using heated tools
- B29C 66/1122: {Single lap to lap joints, i.e. overlap joints (B29C66/45, B29C66/472, B29C66/52272 take precedence)}
- B29C 66/232: {said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines}
- B29C 66/431: {Joining the articles to themselves (B29C66/4322 and B29C66/4332 take precedence)}
- B29C 66/73921: {characterised by the materials of both parts being thermoplastics}
- B29C 66/8221: {Scissor or lever mechanisms, i.e. involving a pivot point}
- B29C 66/8226: {Cam mechanisms; Wedges; Eccentric mechanisms}
- B29C 66/82263: {Follower pin or roller cooperating with a groove}
- B29C 66/82265: {Eccentric mechanisms}
- B29C 66/83543: {cooperating flying jaws}
- B29C 66/8432: {Machines for making separate joints at the same time mounted in parallel or in series}
- B29C 66/8511: {Bag making machines}
- B29C 66/8762: {Cleaning of the joining tools}
- B31B 70/00: Making flexible containers, e.g. envelopes or bags
- B29C 66/71: {characterised by the composition of the plastics material of the parts to be joined (welding bar compositions B29C65/125)}
- B29C 66/727: {being porous, e.g. foam}
- B29C 66/8225: {Crank mechanisms}
- B29C 2793/0045: Perforating
- B29C 2793/0081: before shaping
- B29K 2023/06: {PE, i.e. polyethylene}
- B29K 2101/12: Thermoplastic materials
- B29K 2105/04: cellular or porous
- B29L 2031/7128: {Bags, sacks, sachets (tea bags B29L2031/7122; medical bags B29L2031/7148)}
- B31B 70/14: Cutting, e.g. perforating, punching, slitting or trimming (cutting window openings B31B70/83)
- B31B 70/64: by applying heat or pressure (to unite areas where adhesives are applied B31B70/62)
- B31B 2155/00: Flexible containers made from webs
- B31B 2155/001: {by folding webs longitudinally}
- B31B 2155/0014: {having their openings facing transversally to the direction of movement}
- B31B 2160/10: rectangular and flat, i.e. without structural provision for thickness of contents
- B31B 2160/106: {obtained from sheets cut from larger sheets or webs before finishing the bag forming operations}
- B65D 75/44: Individual packages cut from webs or tubes
- 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 (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- B31B: MAKING CONTAINERS OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER (making wound articles, e.g. wound tubes, B31C; combined making and filling B65B)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29L: INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B65D: CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES

## Abstract

A machine for the production of bags made of alveolar or foamed plastic material starting from at least one continuous web with superimposed flaps fed continuously to a heat-sealing assembly. The heat-sealing assembly is actuated according to a pendular motion in synchronism with continuous advance of the web, and is pre-arranged for carrying out, at the same time as heat-sealing, half-cuts on the web, which is then folded in concertina fashion by means of a lapper assembly at output from the machine.

## Claims

### Claim 1

A machine for the production of bags made of thermoplastic material starting from at least one continuous web with superimposed flaps fed continuously to a heat-sealing assembly, said heat-sealing assembly including:
a hot-blade device and a contrast element set transversely on opposite sides with respect to the web,
actuation means for controlling displacement of the heat-sealing assembly and mutual opening and closing between said hot-blade device and said contrast element in synchronism with advance of the web, and
wherein said actuation means are pre-arranged for carrying out a pendular motion of said heat-sealing assembly; and wherein said heat-sealing assembly includes a generally vertical support oscillating about a transverse axis situated underneath the web and carrying at the top said hot-blade device and said contrast element, and said actuation means including a crank mechanism with a motor-driven shaft with an eccentric cam parallel to said transverse axis and actuating said oscillating support.

### Claim 2 (depends on 1)

The machine according to claim 1, wherein said eccentric camshaft carries a cam co-operating with an oscillating rocker that controls, via a pair of respective connecting rods, the reciprocating translation of said hot-blade device and of said contrast element along said support in mutually opposite directions for providing mutual opening and closing during the pendular motion of said support.

### Claim 3 (depends on 1)

The machine according to claim 1, wherein said hot-blade device comprises a pair of heated bars mutually parallel and contiguous.

### Claim 4 (depends on 3)

The machine according to claim 3, wherein set between said heated bars is a blade for transverse cutting of the web.

### Claim 5 (depends on 4)

The machine according to claim 4, wherein said cutting blade is shaped so as to provide a half-cut of the web between each pair of heat-seals performed by said pair of heated bars.

### Claim 6 (depends on 5)

The machine according to claim 5 further comprising, downstream of said heat-sealing assembly, a lapper assembly for folding over said web about said half-cut in concertina fashion.

### Claim 7 (depends on 6)

The machine according to claim 6, wherein associated to said lapper assembly is a motor-driven tearing device selectively actuatable for dividing the web in areas corresponding to said half-cuts.

### Claim 8 (depends on 1)

The machine according to claim 1, wherein said web is made of alveolar or foamed polyethylene.

### Claim 9 (depends on 1)

The machine according to claim 1, further comprising a longitudinal cutting assembly for cutting the web.

### Claim 10 (depends on 1)

The machine according to claim 1, further comprising a longitudinal heat-sealing assembly for sealing the web.

### Claim 11 (depends on 1)

The machine according to claim 1, pre-arranged for operating with a pair of webs set alongside one another.

### Claim 12 (depends on 1)

The machine according to claim 1, further comprising an electronic control unit for regulating and controlling a rate of advance of the web and the pendular motion of said heat-sealing assembly.