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GB2275442A - Vacuum sealing plastics bags - Google Patents

Vacuum sealing plastics bags Download PDF

Info

Publication number
GB2275442A
GB2275442A GB9303754A GB9303754A GB2275442A GB 2275442 A GB2275442 A GB 2275442A GB 9303754 A GB9303754 A GB 9303754A GB 9303754 A GB9303754 A GB 9303754A GB 2275442 A GB2275442 A GB 2275442A
Authority
GB
United Kingdom
Prior art keywords
sealing
plastic
wires
lid
heatable
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Withdrawn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
GB9303754A
Other versions
GB9303754D0 (en
Inventor
Ka-Nam Ho
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.)
KWONNIE ELECTRICAL PRODUCTS LT
Kwonnie Electrical Products Ltd
Original Assignee
KWONNIE ELECTRICAL PRODUCTS LT
Kwonnie Electrical Products Ltd
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 KWONNIE ELECTRICAL PRODUCTS LT, Kwonnie Electrical Products Ltd filed Critical KWONNIE ELECTRICAL PRODUCTS LT
Priority to GB9303754A priority Critical patent/GB2275442A/en
Publication of GB9303754D0 publication Critical patent/GB9303754D0/en
Publication of GB2275442A publication Critical patent/GB2275442A/en
Withdrawn legal-status Critical Current

Links

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
    • 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
    • B29C65/22—Heated wire resistive ribbon, resistive band or resistive strip
    • B29C65/221—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip
    • B29C65/222—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire
    • B29C65/223—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip comprising at least a single heated wire comprising several heated wires
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/745—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool
    • B29C65/7453—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using a single unit having both a severing tool and a welding tool the severing tool being a wire
    • 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
    • B29C66/23—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations
    • B29C66/232—Particular design of joint configurations particular design of the joint lines, e.g. of the weld lines said joint lines being multiple and parallel or being in the form of tessellations said joint lines being multiple and parallel, i.e. the joint being formed by several parallel joint lines
    • 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
    • B29C66/431—Joining the articles to themselves
    • B29C66/4312—Joining the articles to themselves for making flat seams in tubular or hollow articles, e.g. transversal seams
    • B29C66/43121—Closing the ends of tubular or hollow single articles, e.g. closing the ends of bags
    • 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
    • B29C66/818—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
    • B29C66/8181—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 cooling constructional aspects
    • 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
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • 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
    • B29C66/8324—Joining or pressing tools pivoting around 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/841—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions
    • B29C66/8416—Machines or tools adaptable for making articles of different dimensions or shapes or for making joints of different dimensions of different thickness
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/849—Packaging machines
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held 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
    • B29C66/90—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
    • 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
    • B29C66/94—Measuring or controlling the joining process by measuring or controlling the time
    • B29C66/944—Measuring or controlling the joining process by measuring or controlling the time by controlling or regulating the time
    • B29C66/9441—Measuring or controlling the joining process by measuring or controlling the time by controlling or regulating the time the time being controlled or regulated as a function of another parameter
    • 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
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/741—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area characterised by the relationships between the joining step and the severing step
    • B29C65/7411—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area characterised by the relationships between the joining step and the severing step characterised by the temperature relationship between the joining step and the severing step
    • B29C65/7412—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area characterised by the relationships between the joining step and the severing step characterised by the temperature relationship between the joining step and the severing step the joining step and the severing step being performed at 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
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/001—Joining in special atmospheres
    • B29C66/0012—Joining in special atmospheres characterised by the type of environment
    • B29C66/0014—Gaseous environments
    • B29C66/00145—Vacuum, e.g. partial vacuum
    • 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
    • B29C66/71—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 composition of the plastics material of the parts to be joined
    • 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
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/861—Hand-held tools
    • B29C66/8618—Hand-held tools being battery operated
    • 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
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/712—Containers; Packaging elements or accessories, Packages
    • B29L2031/7128—Bags, sacks, sachets

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Vacuum Packaging (AREA)

Abstract

Apparatus for sealing plastic, e.g. vacuum sealed packaging comprises at least two heatable wires (4, 5) for sealing, at least one other heatable wire (6) for cutting and urging means for urging plastic against the wires (3). The cutting wire (6) is located between two sealing wires (4, 5), and operation of the cutting wire (6) may be selectively switched on or off. In addition, the temperature of the sealing wires (4, 5) is selectively variable. The urging means comprises a silicone rubber urging strip (13) mounted on the lid (2) of the apparatus and is pressed down onto the heatable wires (3) mounted on the upper surface of the base (1) of the apparatus in order to compress the plastic against the heatable wires (3). The apparatus for sealing plastic further comprises a vacuum generating means which comprises a ribbed air extractor nozzle (14). Operation of the vacuum generating means is switched on when the lid (2) is lowered to either of two designated positions and operation of the sealing wires (4, 5) is switched on when the lid (2) is lowered to the lower of two designated positions. <IMAGE>

Description

VACUUM SEALER The present invention relates to a vacuum sealer, and more particularly to a vacuum sealer for sealing and cutting plastic bags made of a variety of different types of plastic.
Many types of vacuum sealer for both home and light commercial use are well known in the prior art. These sealers are generally used for sealing high and low density polyethylene and styrene-based plastic bags. However, most of these prior art sealers use only one or two heatable wires for the dual function of both cutting and sealing, which means that the wires quickly become less efficient with use and there is no option of sealing a bag without cutting it, for example, if a series of pouches or connecting bags, or a double seal, are required.
Other types of prior art sealer provide a wire for sealing and a separate blade for cutting. However, this is not only inconvenient for the user, but adds to the cost of the apparatus.
In addition, most of the prior art vacuum sealers usually seal at a certain set temperature, which means that some plastic bags made of high melting point plastic are not sealed efficiently.
Finally, another problem with many of the prior art vacuum sealers is that the means for generating the vacuum during sealing is often inefficient.
The present invention thus aims to provide a vacuum sealer with a substantially improved sealing strength, which is readily adaptable to seal and/or cut a wide range of different types of plastics materials, of differing strengths, thicknesses and/or melting points and which has the option of being able to seal without cutting so as to, for example, produce a series of pouches or connecting bags, or a double seal. A preferred aim of the present invention is to provide a more efficient vacuum generating means to ensure airtight sealing. Airtight sealing is particularly important for the hygienic storage of food and helps to preserve the flavour, freshness, colour and nutrient content of the food.
According to the present invention, there is provided an apparatus for sealing plastic, which apparatus comprises at least two heatable wires for sealing plastic, at least one other heatable wire for cutting plastic and urging means for urging plastic against the wires.
Preferably, the cutting wire is capable of forming a tear line across the plastic, so that the plastic may later be torn along the tear line.
Preferably, the operation of the cutting wire may be selectively switched on or off, thus allowing a bag to be sealed without being cut, so that, for example, a series of pouches or connecting bags, or a double seal, may be produced.
Preferably, the temperature of a sealing wire is selectively variable, so that different types of plastics materials of differing strengths, thicknesses and/or melting points may be sealed efficiently.
Preferably the operation time of a sealing wire is selectively variable, again enabling efficient sealing of different types of plastic materials of differing strengths, thicknesses and/or melting points.
Preferably the apparatus further comprises vacuum generating means.
Preferably the vacuum generating means comprises an air extractor nozzle which is ribbed for more efficient extraction of air from plastic bags. Airtight sealing is particularly important for the hygienic storage of food and helps to preserve the flavour, freshness, colour and nutrient content of the food.
In order to illustrate the features and advantages of the present invention, the present invention will be further described, by way of example only, and with reference to the accompanying drawings, in which: FIGURE 1 shows a perspective view of a sealer according to the present invention; FIGURE 2 shows a perspective view of the sealer of Figure 1 in preparation for a vacuum and sealing operation; FIGURE 3 shows a detailed perspective view of the left side of the vacuum sealer of Figures 1 and 2; FIGURE 4 shows a side view of the back of the vacuum sealer of Figures 1, 2 and 3; and FIGURE 5 shows a perspective view of the interior of the top housing of the vacuum sealer of Figures 1 to 4.
Referring to Figures 1 to 3, a vacuum sealer according to the present invention comprises a base 1 having two long sides and two short sides, a lid 2, pivotally attached to the base 1, and three substantially parallel heatable wires 3 positioned on the upper surface of the base 1, adjacent and parallel with one of the long sides of the base 1. Whilst more than three heatable wires may be provided, this embodiment, in which there are only three heatable wires, is considered to be the most costeffective.
Of the three heatable wires 3, the sole function of the two outer wires 4,5 is sealing and the sole function of the central wire 6 is cutting. The three heatable wires 3 are made of a high heat- and electrically-conducting material, preferably an alloy of nickel and chromium.
However, the sealing wires 4,5 are enclosed in a layer of heat-resistant tape (not shown), which, in use, lowers the temperature of the sealing wires 4,5 in comparison to the cutting wire 6. The lower temperature of the sealing wires 4,5 enables the sealing wires 4,5 to carry out their sealing function, whereas the higher temperature of the uncovered cutting wire 6 enables the cutting wire 6 to carry out its cutting function.
The temperature of the sealing wires 4,5 is selectively variable, to allow sealing of plastic sheets or plastic bags 7 of different strengths, thicknesses, material types or melting points. Different temperatures or ranges of temperature, for example, high, medium and low, may be selected by means of a temperature selector switch 8 on the upper surface of the base 1. The temperature selector switch 8 shown in the drawings varies the temperature of the sealing wires 4,5 by varying their operation times. The longer the operation time of the sealing wires 4,5, the higher the temperature.
The cutting wire 6 may be provided either to cut the plastic sheets or plastic bags 7, as in the example of the vacuum sealer shown in the drawings, or to create a tear line across the plastic sheets or bags 7, so that the plastic sheets or bags 7 may later be torn along the tear line. The cutting wire 6 may be selectively switched on or off, by means of a cutting selector switch 9, on the upper surface of the base 1. Switching the cutting wire 6 off enables the plastic sheets or bags 7 to be sealed without being cut so that, for example, a series of pouches or connecting bags, or a double seal, can be produced.
The base 1 comprises a top housing 10 and a bottom housing 11 and is made from any suitable heat-resistant material, such as polycarbonate, polyurethane, polyacrylate, polyvinylchloride, polystyrene, polyester, fibreglass or the like. The lid 2 is also made of a suitable heat-resistant material and has a surface area the same as or slightly smaller than the upper surface area of the top housing 10.
The lid 2 has two long sides and two short sides.
One of the long sides of the lid 2 is pivotally attached to the upper surface of the top housing 10 by means of a pair of hinges 12 in a position adjacent and parallel with the long side of the base 1, opposite to the long side of the base 1 where the heatable wires 3 are mounted. The pivotally attached lid 2 may thus be raised (opened) or lowered (closed) onto the top housing 10 by means of the hinges 12. The lid 2 is shown in the open position in Figures 1 to 3, and in the closed position in Figure 4.
An urging strip 13 is mounted on the inside of the lid 2, adjacent to and parallel with the long side of the lid 2, opposite to the long side of the lid 2 which is hinged to the top housing 10. The urging strip 13 is made of a material with an operational temperature of from -730C to 2320C, and is preferably made from silicone rubber.
The housing lid 2 may be lowered or closed to two designated positions (not shown). In the first designated position, the urging strip 13 rests gently on, but is not pressed against, the heatable wires 3. In the second designated position, the urging strip 13 is pressed fully against the heatable wires 3.
The perimeter of the inner surface of the lid 2 is lined with an elastomeric cushion pad (not shown). A correspondingly positioned elastomeric cushion pad is mounted on the upper surface of the top housing 10 so that when the lid 2 is lowered onto the top housing 10, the two elastomeric cushion pads come into contact with each other to provide a more resilient cushion for controlling the compression pressure applicable to urge the strip 13 against the heatable wires 3.
Referring now to Figure 5, an air extractor nozzle 14 is provided in the centre of the upper surface of the top housing 10, between the heatable wires 3 and the hinged edge of the lid 2. A turbine fan 15, driven by a motor 16 and optionally powered by an AC power source through a transformer 17 is located in the base 1 under the top housing 10. The transformer 17 also provides the energy to heat the heatable wires 3 and drives the other functions of the sealer. Alternatively, a battery power source (not shown) may be used, if suitable. The turbine fan 15 is connected to the air extractor nozzle 14 by means of a rubber tube 18. The turbine fan 15 has straight fins 19 which efficiently draws air out from the plastic bag 7, through the nozzle 14 and the tube 18. The air extractor nozzle 14 is preferably ribbed for more efficient extraction of air from the plastic bag, the ribs creating channels towards the rear of the plastic bag 7 and allowing air to enter the nozzle 14 from both the sides and ends of the plastic bag 7.
A small projection 20 is provided in the centre of the inner surface of the lid 2, between the urging strip 13 and the hinged edge of the lid 2. The projection 20 is so positioned as to fit around the air extractor nozzle 14 when the lid 2 is closed, for more efficient extraction of air from the plastic bag 7 by the vacuum generating means.
Coloured indicator lights (LEDs) 21,22 are provided on the upper surface of the top housing 10, and are automatically activated to indicate when the vacuum generating means and/or the sealing wires 4,5 respectively, are in operation.
A roll 23 of plastic sheets or folded plastic bags 7 is also provided on the upper surface of the top housing 10, parallel to the hinged edge of the lid 2 and the heatable wires 3 and between the air extractor nozzle 14 and the hinged edge of the lid 2.
The top and bottom housing 10 and 11, respectively, may further comprise a power cord storage compartment 24 for storage of a power cord 25 (see Figure 4).
During operation of the apparatus of the present invention, a sheet of plastic or a plastic bag 7 is unrolled from the roll 23.
In the case of a plastic bag 7, food, liquid, or any other object 26 is placed into the plastic bag 7 and the open edge of the plastic bag 7 is placed over the heatable wires 3 in preparation for sealing, making sure that the area of the bag 7 to be sealed is free from food, liquid or any of the other contents of the bag (see Figure 2).
The air extractor nozzle 14 is inserted between the two plastic sheets of the plastic bag 7 and the lid 2 is gently lowered to the first designated position, so that the urging strip 13 rests gently on, but is not pressed against, the heatable wires 3. Closing of the lid 2 to this first designated position automatically switches on the motor 16 and turbine fan 15 of the vacuum generating means and the suction created by the turbine fan 15 draws air out of the interior of the plastic bag 7, through the air extractor nozzle 14 and through the rubber tube 18 so that air is finally expelled into the atmosphere. The vacuum indicator light (LED) 21 (for example a red light) on the upper surface of the top housing 10 is automatically activated to indicate that the vacuum generating means has been switched on and is in operation.
Once a sufficient vacuum has been generated, the lid 2 is moved to the second designated position, so that the urging strip 13 is pressed fully against the heatable wires 3.
A sufficient vacuum has been generated when the plastic bag 7 sticks to the contents 26 of the bag 7 without any further change in the vacuum level.
In the second designated position, the sealing cycle is automatically switched on and the sealing wires 4,5 are heated up. The sealing indicator light (LED) 22 (for example a green light) on the upper surface of the top housing 10 is automatically activated to indicate that the sealing wires 4,5 have been switched on and are in operation. The temperature operation time of the sealing wires 4,5 is selected by means of the temperature selector switch 8 on the upper surface of the top housing 10 which varies the operation time of the sealing wires 4,5. The urging strip 13 compresses the plastic sheets 7 against the heatable wires 3 so that the heat from the sealing wires 4,5 fuses the sheets of plastic 7 together along the whole length of each sealing wire to form a double airtight seal.
The vacuum generating means continues to function throughout the sealing cycle, so that the seals are formed under vacuum.
After the sealing cycle, the sealing indicator light 22 is automatically deactivated. The lid 2 may then be raised (opened) to release the vacuum sealed plastic bag 7 containing food, liquid or any other object 26. When the lid 2 is raised to the open position shown in Figures 1 to 3, operation of the vacuum generating means is automatically switched off and the vacuum indicator light 21 is accordingly deactivated.
In the case of the roll 23 of plastic sheets 7 the roll 23 consists of two continuous sheets of plastic 7 sealed together at both ends and along the whole length of one side, leaving the opposite side open. Because the plastic roll 23 is positioned parallel to the heatable wires 3, when a length of plastic 7 is unrolled from the plastic roll 23, the ends of the plastic sheets 7 lie parallel to the heatable wires 3, whereas the sealed and open sides of the plastic sheets 7 both lie perpendicularly across the heatable wires 3.
The desired length of plastic sheets 7 is unrolled from the roll 2 and is placed over the heatable wires 3, in preparation lor sealing and/or cutting. The method of sealing the plastic sheets 7 is the same as for a plastic bag 7, except th.)t no vacuum will be created because of the open side of thor plastic sheets 7. A bag 7, with three edges closed and the remaining edge open is created in this way.
In addition, the cutting function of the cutting wire 6 may be selectively switched on after the vacuum sealing step, by means of the cutting selector switch 9 on the upper surface of the top housing 10. Thus, when the cutting function of the cutting wire 6 is switched on, the cutting wire 6 is heated up and cuts the plastic sheets 7 between the two seals previously formed by the sealing wires 4,5. This releases a newly created plastic bag 7, the single remaining open edge of which may be sealed under vacuum as described above. In addition, this leaves the end of the plastic sheets 7 on the roll 23 sealed in preparation for subsequent use.
If, on the other hand, the cutting function of the cutting wire 6 is switched off, no cutting takes place. A series of pouches or connecting bags may thus be formed in this way.
The sealer of the present invention is thus able efficiently to seal and/or cut a wide range of plastics materials, of different strengths, thicknesses and/or melting points under vacuum and provides an efficient means for storing food, liquid and/or other objects in airtight plastic bags.

Claims (32)

CLAIMS:
1. An apparatus for sealing plastic, which apparatus comprises at least two heatable wires for sealing plastic, at least one other heatable wire for cutting plastic and urging means for urging plastic against the wires.
2. An apparatus according to Claim 1, wherein the cutting wire is capable of forming a tear line across plastic.
3. An apparatus according to Claim 1 or 2, wherein a cutting wire is located between two sealing wires.
4. An apparatus according to any one of Claims 1 to 3, wherein operation of a cutting wire may be selectively switched on or off.
5. An apparatus according to any one of Claims 1 to 4, wherein the heatable wires are made of a high heat and electrically-conducting material.
6. An apparatus according to Claim 5, wherein the high heat and electrically-conducting material comprises an alloy of nickel and chromium.
7. An apparatus according to any one of Claims 1 to 6, wherein a sealing wire is enclosed in a layer of heat resistant tape.
8. An apparatus according to any one of the preceding Claims, wherein the temperature of a sealing wire is selectively variable.
9. An apparatus according to any one of the preceding Claims, wherein the operation time of a sealing wire is selectively variable.
10. An apparatus according to any one of the preceding Claims, wherein the urging means comprises a base and a lid, and wherein the heatable wires are located on the upper surface of the base and an urging strip is mounted on the lid, opposed to the heatable wires, for compressing plastic against the heatable wires.
11. An apparatus according to Claim 10, wherein the base is made of a heat-resistant material.
12. An apparatus according to Claims 10 or 11, wherein the lid is made of a heat-resistant material.
13. An apparatus according to Claims 11 or 12, wherein the heat resistant material comprises at least one of polycarbonate, polyurethane, polyacrylate, polyvinylchloride, polystyrene, polyester, fibreglass or the like.
14. An apparatus according to any one of Claims 10 to 13, wherein the urging strip comprises a material with an operational temperature of from -730C to 2320C.
15. An apparatus according to any one of Claims 10 to 14, wherein the urging strip comprises silicone rubber.
16. An apparatus according to any one of Claims 10 to 15, further comprising an elastomeric cushion lining the perimeter of the inner surface of the lid and an opposed elastomeric cushion mounted on the upper surface of the base.
17. An apparatus according to any one of the preceding Claims, further comprising vacuum generating means.
18. An apparatus according to Claim 17, wherein the vacuum generating means comprises a turbine fan and an air extractor nozzle.
19. An apparatus according to Claim 18, wherein the air extractor nozzle is ribbed.
20. An apparatus according to any one of Claims 10 to 19, wherein the lid may be positioned in at least two designated positions.
21. An apparatus according to Claim 20, wherein the vacuum generating means is switched on when the lid is lowered to either designated position, and operation of the sealing wires is switched on when the lid is lowered to the lower of the two designated positions.
22. An apparatus according to any one of the preceding Claims, further comprising a roll of- plastic for use in producing plastic bags.
23. An apparatus according to any one of the preceding Claims, further comprising a power cord storage compartment positioned below the base.
24. A vacuum generating means which comprises a ribbed air extractor nozzle.
25. A vacuum generating means according to Claim 24, which further comprises a turbine fan.
26. A vacuum generating means according to Claim 24 or 25 for use in an apparatus for sealing plastic according to any one of Claims 10 to 16 or 20 to 23.
27. A method of sealing sheets of plastic using an apparatus according to any one of the preceding Claims, in which method plastic is held over the sealing and cutting wires, an appropriate sealing temperature and/or sealing time is selected, the urging means is actuated to urge the plastic against the wires and the sealing wires are actuated to seal the plastic.
28. A method according to Claim 27, wherein a cutting wire is actuated to cut the plastic after the sealing step.
29. A method according to Claim 27 or 28, wherein an air extractor nozzle is inserted between the sheets of plastic and a vacuum generating means is actuated before the sealing and/or cutting step to create a vacuum during the sealing and/or cutting step.
30. An apparatus for sealing plastic, substantially as hereinbefore described, with reference to and as shown in Figures 1 to 5 of the accompanying drawings.
31. A method of sealing sheets of plastic substantially as hereinbefore described with reference to Figures 1 to 5 of the accompanying drawings.
32. Any novel feature or combination of features described herein.
GB9303754A 1993-02-25 1993-02-25 Vacuum sealing plastics bags Withdrawn GB2275442A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB9303754A GB2275442A (en) 1993-02-25 1993-02-25 Vacuum sealing plastics bags

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB9303754A GB2275442A (en) 1993-02-25 1993-02-25 Vacuum sealing plastics bags

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GB9303754D0 GB9303754D0 (en) 1993-04-14
GB2275442A true GB2275442A (en) 1994-08-31

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Cited By (7)

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Publication number Priority date Publication date Assignee Title
EP1403185A1 (en) * 2002-09-27 2004-03-31 Depuy Products, Inc. Vacuum packaging machine
US7000369B1 (en) * 2000-03-07 2006-02-21 Papiers A Paviot Feed roll for package tubing equipped with cutting and sealing means
EP1564148A3 (en) * 2004-02-12 2006-05-03 FLAEM NUOVA S.p.A. Apparatus for creating a vacuum in containers for preserving vacuum-packed products
GB2465778A (en) * 2008-11-28 2010-06-02 Daniel John Curley Portable heat sealing device
EP2768736A4 (en) * 2011-10-21 2015-09-23 Sunbeam Products Inc VACUUM PACKAGING AND SEALING APPARATUS HAVING DOUBLE GASKET
WO2019013714A1 (en) * 2017-07-14 2019-01-17 Status D.O.O. Metlika A device for external vacuum sealing of bags containing food
EP4342660A1 (en) * 2022-08-09 2024-03-27 Acco UK Limited Vacuum sealing device

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Publication number Priority date Publication date Assignee Title
CN107235193B (en) * 2017-06-21 2023-07-25 广东邦泽创科电器股份有限公司 Vacuum sealing machine and bag cutting and sealing method

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GB1397709A (en) * 1972-10-03 1975-06-18 Tetra Pak Int Shrink-film wrapping and packaging
FR2557500A1 (en) * 1983-12-28 1985-07-05 Prepac Welding and separating press for bags made of weldable plastic
WO1988000887A1 (en) * 1986-07-28 1988-02-11 Baxter Travenol Laboratories, Inc. Apparatus for sealing and severing a web of film
US5048269A (en) * 1990-05-09 1991-09-17 Frank Deni Vacuum sealer
GB2247210A (en) * 1990-07-25 1992-02-26 Timothy John Alden Sealing bags and containers
US5149943A (en) * 1992-01-08 1992-09-22 Viskase Corporation Heat sealing member for making contoured heat seals

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Publication number Priority date Publication date Assignee Title
GB1158200A (en) * 1966-11-16 1969-07-16 Menschner Gmbh Method and Apparatus for Joining Thermoplastic Films.
GB1397709A (en) * 1972-10-03 1975-06-18 Tetra Pak Int Shrink-film wrapping and packaging
FR2557500A1 (en) * 1983-12-28 1985-07-05 Prepac Welding and separating press for bags made of weldable plastic
WO1988000887A1 (en) * 1986-07-28 1988-02-11 Baxter Travenol Laboratories, Inc. Apparatus for sealing and severing a web of film
US5048269A (en) * 1990-05-09 1991-09-17 Frank Deni Vacuum sealer
GB2247210A (en) * 1990-07-25 1992-02-26 Timothy John Alden Sealing bags and containers
US5149943A (en) * 1992-01-08 1992-09-22 Viskase Corporation Heat sealing member for making contoured heat seals

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7000369B1 (en) * 2000-03-07 2006-02-21 Papiers A Paviot Feed roll for package tubing equipped with cutting and sealing means
EP1403185A1 (en) * 2002-09-27 2004-03-31 Depuy Products, Inc. Vacuum packaging machine
US7302784B2 (en) 2002-09-27 2007-12-04 Depuy Products, Inc. Vacuum packaging machine
EP1564148A3 (en) * 2004-02-12 2006-05-03 FLAEM NUOVA S.p.A. Apparatus for creating a vacuum in containers for preserving vacuum-packed products
GB2465778A (en) * 2008-11-28 2010-06-02 Daniel John Curley Portable heat sealing device
EP2768736A4 (en) * 2011-10-21 2015-09-23 Sunbeam Products Inc VACUUM PACKAGING AND SEALING APPARATUS HAVING DOUBLE GASKET
WO2019013714A1 (en) * 2017-07-14 2019-01-17 Status D.O.O. Metlika A device for external vacuum sealing of bags containing food
EP4342660A1 (en) * 2022-08-09 2024-03-27 Acco UK Limited Vacuum sealing device

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