WO2019013714A1 - A device for external vacuum sealing of bags containing food - Google Patents

A device for external vacuum sealing of bags containing food Download PDF

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Publication number
WO2019013714A1
WO2019013714A1 PCT/SI2018/050022 SI2018050022W WO2019013714A1 WO 2019013714 A1 WO2019013714 A1 WO 2019013714A1 SI 2018050022 W SI2018050022 W SI 2018050022W WO 2019013714 A1 WO2019013714 A1 WO 2019013714A1
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WO
WIPO (PCT)
Prior art keywords
lid
lock
vacuum sealing
handle
external vacuum
Prior art date
Application number
PCT/SI2018/050022
Other languages
French (fr)
Inventor
Branko Culig
Marko CULIG
Original Assignee
Status D.O.O. Metlika
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 Status D.O.O. Metlika filed Critical Status D.O.O. Metlika
Publication of WO2019013714A1 publication Critical patent/WO2019013714A1/en

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B31/00—Packaging articles or materials under special atmospheric or gaseous conditions; Adding propellants to aerosol containers
    • B65B31/04—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied
    • B65B31/046—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied the nozzles co-operating, or being combined, with a device for opening or closing the container or wrapper
    • B65B31/048—Evacuating, pressurising or gasifying filled containers or wrappers by means of nozzles through which air or other gas, e.g. an inert gas, is withdrawn or supplied the nozzles co-operating, or being combined, with a device for opening or closing the container or wrapper specially adapted for wrappers or bags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
    • 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
    • B29C65/224—Heated wire resistive ribbon, resistive band or resistive strip characterised by the type of heated wire, resistive ribbon, band or strip being a resistive ribbon, a resistive band or a resistive strip
    • 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
    • B29C65/78—Means for handling the parts to be joined, e.g. for making containers or hollow articles, e.g. means for handling sheets, plates, web-like materials, tubular articles, hollow articles or elements to be joined therewith; Means for discharging the joined articles from the joining apparatus
    • B29C65/7841—Holding or clamping means for handling purposes
    • 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
    • B29C66/40—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
    • B29C66/80—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
    • B29C66/849—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
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65B—MACHINES, APPARATUS OR DEVICES FOR, OR METHODS OF, PACKAGING ARTICLES OR MATERIALS; UNPACKING
    • B65B51/00—Devices for, or methods of, sealing or securing package folds or closures; Devices for gathering or twisting wrappers, or necks of bags
    • B65B51/10—Applying or generating heat or pressure or combinations thereof
    • B65B51/14—Applying or generating heat or pressure or combinations thereof by reciprocating or oscillating members
    • B65B51/148—Hand-operated members
    • 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
    • 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

Definitions

  • the present invention belongs to the field of small household devices, more precisely to the field of devices for vacuum packing of food.
  • the present invention is based on the problem how to join several functions in one device that would optimize the procedure for preparation and vacuum sealing of food (also called vacuuming and welding of bags with food as the air is first sucked out and then the bag is sealed by heat welding).
  • the persisting problem of vacuum sealing of food for longer periods of time as well as storage of so packed food in a fridge or freezer is that air is not completely pumped out and that the sealing is not always reliable. It is desired to make the storage and sealing process as simple as possible, so that for example lifting of a lid or estimating the time for sealing (welding) is avoided.
  • the mechanism of the device should be simple and partly automated, so that the vacuum sealing process is independent from the sealing time and skill of the user.
  • European patent 1564148 describes a device for creating a vacuum in receptacles for preservation of vacuum packed goods. It comprises a housing and a lid and a system for pumping the air out of a bag, which is installed in the lower part of the housing. The bag is stored in a roll and is cut by a system for closing and cutting the bag.
  • Document CN 203601618U discloses a device for vacuum sealing of food having a system for pumping the air and a system for welding a bag, but this solution differs from the present invention.
  • known systems of devices for vacuum sealing one hand of the user is engaged for lifting and holding the lid, resulting in that only one arm is free to place and hold the bag in place.
  • the present invention improves the known systems in a simple and efficient way.
  • the essence of the device for external vacuum sealing of bags containing food according to the invention is in that it includes an accessory for attaching the bag before and during vacuum sealing, a mechanism for automatic opening of the lid of the device when the process is finished and a system for automatic shutdown of the welding tape, which employs sensing the working temperature and the sensor can electronically turn off heating of the welding tape when the threshold is exceeded.
  • Figure 1 an outer appearance of the device for external vacuum sealing of bags for food
  • Figure 2 an outer appearance of the device with a lifted lid
  • Figure 4 a mechanism for locking the lid
  • Figure 6 a cross-section A - A with temperature regulation
  • Figure 7 a partial view of the lid 2 from above
  • Figure 8 a partial view of the lid 2 with a lock 8
  • Figure 9 a cross-section C-C with a spring for lifting the lid 8
  • the device for external vacuum sealing of bags containing food comprises all known functional units, such as a vacuum pump in connection with a system for pumping air out the bags, electronics, a welding tape for sealing the bags and a mechanism for closing a lid of the device, which are constructed in a new way.
  • the device for external vacuum sealing of bags containing food has a housing 1 , which comprises a bottom part 12, an upper part 11 and a lid 2.
  • the housing 1 has in the side view the shape of a lying letter U with the bottom part 12, which after a semi-circular part continues into the upper part 11.
  • a control panel 111 is provided in the middle of the upper part 11 of the housing 1 .
  • the upper part 11 has on its left side a narrower part 11a and on the right side a narrower part 11b, which are provided in their upper end with a place for mounting a spring 15 and for attachment of handles 21a and 21b of the lid 2.
  • the handle 21b of the lid 2 is shaped as a mirror image of the handle 21a, which has in its lower part a place 21a' for mounting the spring 15.
  • the first spring 15 is on one side installed between the narrower part 11a and the handle 21a, while on the other side the second spring 15 is installed between the narrower part 11 b and the handle 21b.
  • the lid 2 has an outer circular batten 21 placed between the handles 21a and 21b, wherein the shape of the batten 21 corresponds to the semi-circular radius of the outer batten 123 of the bottom side 12 of the housing 1 (figure 2).
  • a first carrier 24a is provided on the left side and a second carrier 24b is provided on the right side in order to allow mounting the locks 8 and 8' (figure 7).
  • the carrier 24a has a circular hole in its middle, into which a short axis 8c of the lock 8 is installed (figure 8).
  • the short axis 8c functions as a pin.
  • a circular hole is coaxially with the centre part of the hole in the carrier 24a provided in the carrier 24b, into which the short axis of the lock 8' is installed.
  • Parallel to the first carrier 24a a third carrier 24c is provided and on the other side a fourth carrier 24d, which is parallel to the second carrier 24b, is provided.
  • An eccentric part 10 of the lock 8 is via axis 25 connected with the eccentric part 10' of the lock 8', which is mounted between carriers 24d and 24b.
  • the eccentric part 10 is mounted between the handle 8a and handle 8b of the lock 8 (figure 4).
  • the lock 8 is shaped as tongs, wherein the handles 8a and 8b are movable connected to the axis 8c located closer to the upper part of the lock 8.
  • a spring 8d is installed on the other side of the lock 8 between a notch 8a' on the handle 8a and a notch 8b' of the handle 8b a spring 8d is installed.
  • the lock 8' is the same as the lock 8.
  • the cross- section of the eccentric parts 10 and 10' has an elliptical shape. Both eccentric parts are attached to the axis 25.
  • the lid 2 has in the part 22 facing the bottom side 11 of the housing 1 locks 8 in 8', an upper part 9a of the vacuum chamber 9 and propelling silicon elements 23 of the welding tape 4.
  • the top of the locks 8 in 8' through openings 22b in 22a enables a grip with attachment pins 121a and 121 b on the left and right side of the inner part 121 of the housing 1.
  • On the part 121 also the bottom part of the vacuum chamber 9 and assembly of the welding bar 7 are provided, under which the welding tape 4 with the sensor 4a is mounted (figures 5 and 6).
  • Sensor 4a measures the temperature of the welding tape 4 and when the optimal temperature of the welding tape 4 in accordance with the manufacturer's instructions is reached, heating of the tape 4 is electronically terminated.
  • the time needed to reach the optimal temperature is longest in the first cycle, as the tape is cold. For example, for a 130 micrometres thick bag the time needed to reach the optimal temperature is 10 seconds. For sealing the next bag, the time is decreased, as the tape is already warm and reaches its optimal temperature sooner. When the sensor 4a measures the optimal temperature, heating of the tape 4 is terminated. Thus, regulation of the temperature of the welding tape 4 during sealing is automatic.
  • the device for vacuum sealing may have an automatic or a manual mode of operation.
  • the lid 2 is closed and then through an electronic sensor the electronic circuit is automatically activated, which then activates the vacuum pump. After the pre-set vacuum is reached, heating of the welding tape 4 is initiated. The lid remains closed due to the created vacuum (negative pressure) until the process is finished. The lid is automatically lifted when the vacuum chamber is filled with air.
  • the device for vacuum sealing in the manual mode operates as follows: after the bag containing food is fixed to the adhesive tape for keeping it in place, the lid 2 is closed and locked with a handle 10a, which is followed by pressing the START/STOP button that turns on the vacuum pump. By pressing the START/STOP button, the vacuum pump begins to work and the user decides when enough air has been pumped out and after that presses the button WELDING. The decision can be based on a built-in manometer or individual estimation.
  • the bag is welded (sealed), then the vacuum pump is turned off and the vacuum chamber 9 is filled with air, which leads to the lid 2 being opened.
  • the lid is unlocked with the handle 10a and a pair of springs 15 installed in handles 21a and 21b of the lid 2 cause the lid 2 to automatically lift.
  • the vacuum chamber 9 or the created vacuum, respectively, holds the position of the lid 2 in a tight contact with the welding tape 4, the temperature of which is sensed by the temperature sensor 4a.
  • the heat in the welding tape accumulates. Its temperature is measured by the sensor 4a and consequently affects the time of welding. This reduces the energy used for welding for more than a half, while the conditions for welding of the bag remain constant. This system ensures the optimal vacuum in the bag from the first to the last cycle. In addition, it saves time and energy.
  • the present invention solves the problem of unwanted movement of the bag 6 from its optimal vacuuming position, which can occur due to weight of the food, size of the bag (too short) and incapability of holding the bag in the correct place in the vacuum chamber 9 during lowering of the lid 2. In practice this is a serious problem as longer bags have to be used in order to have them vacuum sealed appropriately.
  • the attachment is solved with a two-sided adhesive tape 3, which can be placed in front of the welding tape 4 and the front radius 123 of the bottom part 12.
  • the adhesive tape 3 can also be in front of or behind the welding tape 4 and also in front of the vacuum chamber 9.
  • the attachment is performed so that the bag 6 is placed in the optimal position and pressed to the adhesive tape 3.
  • the adhesive means can also be distributed inside a provisional narrow rectangle in any shape, such as dots, lines, squares, triangles, ellipses and similar shapes.
  • the device can have one, two, three or four welding tapes 4.
  • the adjustable locking system (figure 4) of the lid (2) solves the problem with the height of the seals of the vacuum chamber 9, which changes with multiple usage.
  • a common situation in practice is that the seals have different heights and densities due to differences in manufacturers, which is important for maintenance and repairs.
  • This problem is solved by increasing the stroke of the eccentric part 10 on the lock 8 and consequently increased stroke of the lock 8.
  • the position of the eccentric part 10 ensures self-braking properties of the lock 8.
  • the position of the handle 10a of the eccentric part 10' in inactive (shutdown) mode of the device allows safe storage of the device so that the seals 9 are not in contact, which ensures their stability and quality.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Dispersion Chemistry (AREA)
  • Vacuum Packaging (AREA)

Abstract

The present invention belongs to the field of small household devices, more precisely to the field of devices for vacuum packing of food. The device for external vacuum sealing of bags with food according to the invention includes an accessory (3) or attaching the bag before and during vacuum sealing, a mechanism for automatic opening of the lid (2) of the device when the process is finished and a system for automatic shutdown of the welding tape (4), which employs sensing the working temperature and the sensor can electronically turn off heating of the welding tape when the threshold is exceeded.

Description

A device for external vacuum sealing of bags containing food
Field of the invention
The present invention belongs to the field of small household devices, more precisely to the field of devices for vacuum packing of food.
The technical problem
The present invention is based on the problem how to join several functions in one device that would optimize the procedure for preparation and vacuum sealing of food (also called vacuuming and welding of bags with food as the air is first sucked out and then the bag is sealed by heat welding). The persisting problem of vacuum sealing of food for longer periods of time as well as storage of so packed food in a fridge or freezer is that air is not completely pumped out and that the sealing is not always reliable. It is desired to make the storage and sealing process as simple as possible, so that for example lifting of a lid or estimating the time for sealing (welding) is avoided. The mechanism of the device should be simple and partly automated, so that the vacuum sealing process is independent from the sealing time and skill of the user.
When vacuum sealing a bag containing food the main problem is regulation of the temperature of the welding element or the time of welding, respectively, in order to achieve the optimal vacuum sealing and optimal time consumption (fast operation). All known welding systems are based on a selected time frame, which is constant or is changed only in a mechanical way by the user, who estimates the needed time and selects it by pressing a particular button. In multiple consecutive cycles the welding system is overheating and thus fails to ensure the optimal conditions for most of the vacuum bags for external vacuum sealing because due to the overheated bag the air is not efficiently sucked out. Consequently, the quality of the stored food is hampered. Furthermore, the energy consumption is larger than needed and the sealing lacks sufficient quality. The cycles are also too long and valuable time is lost.
The problem of displacement of the bag with food from the optimal position for vacuum sealing and unwanted displacement due to the weight of the food occurs because it is a challenge to keep the bag in the desired position and lower the lid of the device at the same time. In practice, this results in a problem due to which more foil is used, as bags are much longer than actually needed for good vacuum sealing.
State of the art
Several devices for external vacuum sealing of food are known and their basic function is to pump (suck) the air out of the bag and then seal the bag. Systems for attaching the bags with additional rods, clips and springs, as well as placing the bags into grooves are known, but these solutions consume a lot of time for attachment and do not work reliably, thus the bags are often not held in the optimal position.
Also locking systems are known, which have two positions, open and locked, without any regulation possibilities. Systems for lifting the welding wires have also been disclosed, but they are always linked with the locking function of the device and with constant welding time, which does not enable optimal operation in consecutive cycles.
European patent 1564148 describes a device for creating a vacuum in receptacles for preservation of vacuum packed goods. It comprises a housing and a lid and a system for pumping the air out of a bag, which is installed in the lower part of the housing. The bag is stored in a roll and is cut by a system for closing and cutting the bag.
Document CN 203601618U discloses a device for vacuum sealing of food having a system for pumping the air and a system for welding a bag, but this solution differs from the present invention. In known systems of devices for vacuum sealing one hand of the user is engaged for lifting and holding the lid, resulting in that only one arm is free to place and hold the bag in place. The present invention improves the known systems in a simple and efficient way.
Description of the solution of the technical problem
The essence of the device for external vacuum sealing of bags containing food according to the invention is in that it includes an accessory for attaching the bag before and during vacuum sealing, a mechanism for automatic opening of the lid of the device when the process is finished and a system for automatic shutdown of the welding tape, which employs sensing the working temperature and the sensor can electronically turn off heating of the welding tape when the threshold is exceeded.
The device for vacuum sealing of bags for food according to the invention will be described in further detail based on an exemplary embodiment and figures, which show:
Figure 1 an outer appearance of the device for external vacuum sealing of bags for food
Figure 2 an outer appearance of the device with a lifted lid
Figure 3 a cross-section C - C
Figure 4 a mechanism for locking the lid
Figure 5 a detail with temperature regulation
Figure 6 a cross-section A - A with temperature regulation
Figure 7 a partial view of the lid 2 from above
Figure 8 a partial view of the lid 2 with a lock 8
Figure 9 a cross-section C-C with a spring for lifting the lid 8 The device for external vacuum sealing of bags containing food according to the invention comprises all known functional units, such as a vacuum pump in connection with a system for pumping air out the bags, electronics, a welding tape for sealing the bags and a mechanism for closing a lid of the device, which are constructed in a new way.
As shown in figure 1 the device for external vacuum sealing of bags containing food has a housing 1 , which comprises a bottom part 12, an upper part 11 and a lid 2. The housing 1 has in the side view the shape of a lying letter U with the bottom part 12, which after a semi-circular part continues into the upper part 11. In the middle of the upper part 11 of the housing 1 a control panel 111 is provided. The upper part 11 has on its left side a narrower part 11a and on the right side a narrower part 11b, which are provided in their upper end with a place for mounting a spring 15 and for attachment of handles 21a and 21b of the lid 2.
The handle 21b of the lid 2 is shaped as a mirror image of the handle 21a, which has in its lower part a place 21a' for mounting the spring 15. The first spring 15 is on one side installed between the narrower part 11a and the handle 21a, while on the other side the second spring 15 is installed between the narrower part 11 b and the handle 21b. When the lid 2 is lifted, the pair of springs 15 is fastened and relaxed. When the lid 2 is down, the pair of springs is tensed or compressed (figure 9).
The lid 2 has an outer circular batten 21 placed between the handles 21a and 21b, wherein the shape of the batten 21 corresponds to the semi-circular radius of the outer batten 123 of the bottom side 12 of the housing 1 (figure 2). In the interior of the upper part 22 of the lid 2 a first carrier 24a is provided on the left side and a second carrier 24b is provided on the right side in order to allow mounting the locks 8 and 8' (figure 7). The carrier 24a has a circular hole in its middle, into which a short axis 8c of the lock 8 is installed (figure 8). The short axis 8c functions as a pin. A circular hole is coaxially with the centre part of the hole in the carrier 24a provided in the carrier 24b, into which the short axis of the lock 8' is installed. Parallel to the first carrier 24a a third carrier 24c is provided and on the other side a fourth carrier 24d, which is parallel to the second carrier 24b, is provided. Between the carriers 24a and 24c the lock 8 is mounted. An eccentric part 10 of the lock 8 is via axis 25 connected with the eccentric part 10' of the lock 8', which is mounted between carriers 24d and 24b. The eccentric part 10 is mounted between the handle 8a and handle 8b of the lock 8 (figure 4). The lock 8 is shaped as tongs, wherein the handles 8a and 8b are movable connected to the axis 8c located closer to the upper part of the lock 8. On the other side of the lock 8, between a notch 8a' on the handle 8a and a notch 8b' of the handle 8b a spring 8d is installed. The lock 8' is the same as the lock 8. The cross- section of the eccentric parts 10 and 10' has an elliptical shape. Both eccentric parts are attached to the axis 25.
The lid 2 has in the part 22 facing the bottom side 11 of the housing 1 locks 8 in 8', an upper part 9a of the vacuum chamber 9 and propelling silicon elements 23 of the welding tape 4. The top of the locks 8 in 8' through openings 22b in 22a enables a grip with attachment pins 121a and 121 b on the left and right side of the inner part 121 of the housing 1. On the part 121 also the bottom part of the vacuum chamber 9 and assembly of the welding bar 7 are provided, under which the welding tape 4 with the sensor 4a is mounted (figures 5 and 6). Sensor 4a measures the temperature of the welding tape 4 and when the optimal temperature of the welding tape 4 in accordance with the manufacturer's instructions is reached, heating of the tape 4 is electronically terminated. The time needed to reach the optimal temperature is longest in the first cycle, as the tape is cold. For example, for a 130 micrometres thick bag the time needed to reach the optimal temperature is 10 seconds. For sealing the next bag, the time is decreased, as the tape is already warm and reaches its optimal temperature sooner. When the sensor 4a measures the optimal temperature, heating of the tape 4 is terminated. Thus, regulation of the temperature of the welding tape 4 during sealing is automatic.
The device for vacuum sealing may have an automatic or a manual mode of operation. In the automatic mode the lid 2 is closed and then through an electronic sensor the electronic circuit is automatically activated, which then activates the vacuum pump. After the pre-set vacuum is reached, heating of the welding tape 4 is initiated. The lid remains closed due to the created vacuum (negative pressure) until the process is finished. The lid is automatically lifted when the vacuum chamber is filled with air.
The device for vacuum sealing in the manual mode operates as follows: after the bag containing food is fixed to the adhesive tape for keeping it in place, the lid 2 is closed and locked with a handle 10a, which is followed by pressing the START/STOP button that turns on the vacuum pump. By pressing the START/STOP button, the vacuum pump begins to work and the user decides when enough air has been pumped out and after that presses the button WELDING. The decision can be based on a built-in manometer or individual estimation. The bag is welded (sealed), then the vacuum pump is turned off and the vacuum chamber 9 is filled with air, which leads to the lid 2 being opened. The lid is unlocked with the handle 10a and a pair of springs 15 installed in handles 21a and 21b of the lid 2 cause the lid 2 to automatically lift.
The vacuum chamber 9 or the created vacuum, respectively, holds the position of the lid 2 in a tight contact with the welding tape 4, the temperature of which is sensed by the temperature sensor 4a. In multiple consecutive vacuum sealing cycles, the heat in the welding tape accumulates. Its temperature is measured by the sensor 4a and consequently affects the time of welding. This reduces the energy used for welding for more than a half, while the conditions for welding of the bag remain constant. This system ensures the optimal vacuum in the bag from the first to the last cycle. In addition, it saves time and energy.
The present invention solves the problem of unwanted movement of the bag 6 from its optimal vacuuming position, which can occur due to weight of the food, size of the bag (too short) and incapability of holding the bag in the correct place in the vacuum chamber 9 during lowering of the lid 2. In practice this is a serious problem as longer bags have to be used in order to have them vacuum sealed appropriately. The attachment is solved with a two-sided adhesive tape 3, which can be placed in front of the welding tape 4 and the front radius 123 of the bottom part 12. The adhesive tape 3 can also be in front of or behind the welding tape 4 and also in front of the vacuum chamber 9. The attachment is performed so that the bag 6 is placed in the optimal position and pressed to the adhesive tape 3. Instead of the double-sided adhesive tape 2 the adhesive means can also be distributed inside a provisional narrow rectangle in any shape, such as dots, lines, squares, triangles, ellipses and similar shapes. The device can have one, two, three or four welding tapes 4.
Automatic lifting and holding of the lid 2 in the lifted state solves the problem of manipulation of the bag 6 with both hands after the vacuum sealing is finished and placing a new bag without the need to contact or hold the lid 2.
Known systems installed in devices for external vacuum sealing occupy one hand of the user for lifting and holding the lid, thus more time is needed to properly place the bag (6) with the other hand. The adjustable locking system (figure 4) of the lid (2) solves the problem with the height of the seals of the vacuum chamber 9, which changes with multiple usage. A common situation in practice is that the seals have different heights and densities due to differences in manufacturers, which is important for maintenance and repairs. This problem is solved by increasing the stroke of the eccentric part 10 on the lock 8 and consequently increased stroke of the lock 8. At the same time the position of the eccentric part 10 ensures self-braking properties of the lock 8. The position of the handle 10a of the eccentric part 10' in inactive (shutdown) mode of the device allows safe storage of the device so that the seals 9 are not in contact, which ensures their stability and quality.

Claims

Patent claims
1. A device for external vacuum sealing of bags for food comprises an accessory for attaching a bag before and during vacuum sealing, a system for automatic regulation of temperature of a welding tape, the system comprising a temperature sensor, and a mechanism for automatic opening of a lid of the device when the vacuum sealing is finished.
2. The device for external vacuum sealing of bags according to claim 1 , characterized in that the accessory for attaching the bag is a two-sided adhesive tape and/or adhesive means are distributed inside a narrow rectangle in any shape, such as dots, lines, squares, triangles, ellipses and similar shapes.
3. The device for external vacuum sealing of bags according to claims 1 and 2, characterized in that the system for automatic regulation of temperature of the welding tape (4) is enabled with the temperature sensor (4a), which senses the working temperature and triggers an electronic shutdown of heating of the welding tape (4).
4. The device for external vacuum sealing of bags according to any claim from 1 to 3, characterized in that it comprises a housing (1), which comprises a bottom part (12), and upper part (11) and the lid (2); the housing (1) has in the side view the shape of a lying letter U with the bottom part (12), which after a semi-circular part continues into the upper part (1 ); the upper part (11) has on its left side a narrower part (11a) and on the right side a narrower part (11 b), which are provided in their upper end with a place for attachment of handles (21a and 21b) of the lid (2); the handle (21b) of the lid (2) is shaped as a mirror image of the handle (21a), which has in its lower part a place (21a') for mounting the spring (15); the first spring (15) is on one side installed between the narrower part (11a) and the handle (21a), while on the other side the second spring (15) is installed between the narrower part (11b) and the handle (2 b); when the lid (2) is lifted, the pair of springs (15) is attached and relaxed and when the lid 2 is down, the pair of springs is tensed or compressed.
The device for external vacuum sealing of bags according to any claim from 1 to 4, characterized in that on the left side in the interior of the upper part (22) of the lid (2) a first holder (24a) and on the right side a second holder for installing locks (8 in 8'); that the first holder (24a) has a circular hole in the middle, into which a short axis (8c) of the lock (8) in installed; that the short axis (8c) functions as a pin; a second circular hole is coaxially with the centre part of the hole in the carrier (24a) provided in the carrier (24b), into which the short axis of the lock (8') is installed; parallel to the first carrier (24a) a third carrier (24c) is provided and on the other side a fourth carrier (24d), which is parallel to the second carrier (24b), is provided; between the carriers (24a and 24c) the lock (8) is mounted; the eccentric part (10) of the lock (8) is via axis (25) connected with the eccentric part (10') of the lock (8'), which is mounted between carriers (24d and 24b); the eccentric part (10) is mounted between the handle (8a) and handle (8b) of the lock (8); the lock (8) is shaped as tongs, wherein the handles (8a and 8b) are movably connected to the axis (8c) located closer to the upper part of the lock (8); on the other side of the lock (8), between a notch (8a1) on the handle (8a) and a notch (8b') of the handle (8b) a spring (8d) is installed; the lock (8') is the same as the lock (8); the cross- section of the eccentric parts (10 and 10') has an elliptical shape; the lid (2) has in the part (22) facing the bottom side (11) of the housing (1) installed locks (8 in 8'), upper part (9a) of the vacuum chamber (9) and propelling silicon elements (23) of the welding tape (4); the top of the locks (8 in 8') through openings (22b in 22a) enables a grip with attachment pins (121a and 121b) on the left and right side of the inner part (121) of the housing (1).
The device for external vacuum sealing of bags according to any claim from 1 to 5, characterized in that that the vacuum chamber (9) or the created vacuum keeps the lid (2) in a tight contact with the welding tape (4), the temperature of which is sensed by the temperature sensor (4a).
7. The device for external vacuum sealing of bags according to any claim from 1 to 6, characterized in that the adhesive tape (3) can be in front of or behind the welding tape (4) and also in front of the vacuum chamber (9).
8. The device for external vacuum sealing of bags according to any claim from 1 to 7, characterized in that the device has one, two, three or four welding tapes (4).
PCT/SI2018/050022 2017-07-14 2018-07-13 A device for external vacuum sealing of bags containing food WO2019013714A1 (en)

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SI201700212A SI25471A (en) 2017-07-14 2017-07-14 Vacuuming device for external vacuuming and food bags welding
SIP-201700212 2017-07-14

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EP3858748A1 (en) * 2020-02-03 2021-08-04 Laica S.p.a. Vacuum sealing machine comprising a closure element with a handle
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