JPH0619499Y2 - Check valve for vacuum packaging bag - Google Patents

Description

[Detailed Description of the Invention] (Industrial field of application) The present invention mainly relates to a non-return check for a vacuum packaging bag used for accommodating articles such as foods, which need to be preserved, in a vacuum state in a bag. Regarding the improvement of the valve.

(Prior Art) Conventionally, when food or the like is sealed inside a bag, the food or the like is put into the bag through an insertion port, and a vacuum pump is used to remove air or other unnecessary fluid from the container in order to prevent deterioration or decay. After that, the insertion port is sealed.

Further, as an application previously filed by the inventor of the present invention, an insertion port for an object to be stored is opened in a sealing bag body made of a material having flexibility, water impermeability and air permeability such as a plastic film. At the same time, a check valve for discharging unnecessary fluid in the bag body is installed, and the check valve includes a flow pipe formed flat with a plastic film and at least one valve body installed in the flow pipe. The valve body is composed of a bent piece of a plastic film having an open portion on the front end side and a closed portion on the base end side in the fluid flowing direction, and the both side edges of the valve body are connected to the flow pipe. By integrally adhering to both side edges of the valve, gaps are respectively formed between both inner side surfaces of the flow pipe and both outer side surfaces of the valve body, and unnecessary fluid in the sealing bag is discharged through the gaps. A bag for sealing foods etc. HirakiAkira No. 63-59838) and the like are known.

Furthermore, although not yet known, a flat fluid flow pipe formed by adhering the two side edges of two rectangular plastic films to each other, which was previously developed by the inventor of the present invention, and the flow pipe It is composed of at least one valve body mounted in the pipe, and the valve body is a flat plastic film having a closing portion at the lower end side and an opening portion at the upper end side in the fluid flow direction. The valve body is formed of a folded piece, and both side edges of the valve body are adhered to both side edges of the flow pipe, respectively, and are formed between both inner side surfaces of the flow pipe and both outer side surfaces of the valve body. The fluid is configured to be able to flow through the gap, and the required length of the upper end of the plastic film of at least one of the flow tubes is free from the valve body, and a free edge is formed. For vacuum packaging bag Stop valve is filed.

(Problems to be solved by the invention) However, in any case of each of the above-mentioned conventional technologies,
When performing vacuum processing, it is easy to discharge part of the required vacuum package other than the required vacuum package at the same time, which is uneconomical. There is a serious problem that it is impossible to prevent the vacuum-packed product from being sucked to the pump side and adversely affecting the function of the vacuum pump.

The present invention was developed to solve the above problems, and when sucking and discharging air and other unnecessary fluid in a packaging bag with a vacuum pump, the tip of the suction nozzle of the pump is narrowed. An object of the present invention is to provide a non-return valve for a vacuum packaging bag, which can be easily inserted into a fluid flow gap and can surely suck and discharge only unnecessary fluid.

(Means for Solving the Problems) In order to achieve the above object, in the present invention, a flat flow pipe formed by adhering both side edges of two rectangular plastic films is formed, and a flat flow pipe is formed in the flow pipe. The valve body is composed of at least one valve main body installed and a two-fold filter body having a filter hole of a required size, which is provided outside the tip of the flow pipe. In, a double-folded piece of a flat plastic film having a closed portion on the lower end side and an open portion on the upper end side, and both side edges of the valve body are adhered to both side edges of the flow pipe, respectively. And the fluid is allowed to flow through the gaps respectively formed between the inner side surfaces of the flow pipe and the outer side surfaces of the valve body, and at least one plastic film of the flow pipe is provided. Required for the upper end of The length is separated from the valve body, and a curlable free edge for inserting the tip of the suction nozzle of the vacuum pump is formed in the gap, and the inside of the flow tube at the tip side is formed. The non-return valve for a vacuum packaging bag was developed and adopted, which is characterized in that the outside is communicated only through the above-mentioned filter.

(Operation) As shown in FIG. 4 or FIG. 6, the check valve for a vacuum packaging bag according to the present invention, which is configured as described above, has its lower end side (the side on which the filter body is mounted) inside the packaging bag. , The opening edges of the packaging bag other than the insertion portion are adhered to each other, and both outer surfaces of the inserted check valve flow pipe are adhered to both inner surfaces of the packaging bag. The inside and the outside of the package are used by communicating only through the gap formed in the check valve. However, when air and other unnecessary fluid in the packaging bag are sucked and discharged by the vacuum pump, As shown in, by rolling up the free edge formed on the upper end of one of the plastic films of the flow tube with a fingertip, the tip of the suction nozzle of the vacuum pump can be reliably and easily inserted into the narrow flow gap. Have an effect, and therefore the air inside the bag and other unwanted flow The body can be reliably discharged to the outside, and the body can be efficiently vacuum-packed with foods.

In addition, since the inside and outside of the tip of the flow tube are connected only via the filter, it is possible to reliably prevent the vacuum-needed items from being sucked and discharged when vacuuming the inside of the packaging bag with a vacuum pump. There is an action.

Further, after the vacuum packaging is completed as described above, the check valve in a complete form is formed by cutting off the protruding excess portion of the check valve as shown in FIG. 5. Even if the outside air having a higher pressure than the inside pressure tries to flow into the bag, the outside air reaches the lower end closed portion of the valve body formed in two folds, and the valve body expands and expands on both sides. Has a function of reliably blocking the inflow of outside air, since it closely contacts both inner surfaces of the flow pipe and seals both gaps.

Embodiment An embodiment of the present invention will be described in detail below with reference to the accompanying drawings.

The check valve V for a vacuum packaging bag according to the present invention comprises a flat fluid flow pipe 1 made of a plastic film, and the flow pipe 1
Valve body 2 made of plastic film installed inside
And a filter body 3 having innumerable fine filter holes provided on the distal end side of the flow pipe 1.

As shown in FIGS. 1 and 3, the flow pipe 1 is made by stacking two long and short rectangular plastic films F ₁ and F ₂ which are flexible, thin and slightly different in length.
High-frequency adhesive is applied to both edges on the long side,
The required length of the upper end of the shorter plastic film F ₁ is not adhered, and a free edge F ₁ a is formed at the end.

Further, the valve body 2 is formed by folding a rectangular plastic film F ₃ having the same width and the same material as those of the two plastic films F ₁ and F ₂ of the flow pipe 1 and longer than that into two. The closed portion 4 is formed by a portion, and a bifurcated open portion 5 is formed on the other end side of the closed portion 4. Further, the valve body 2 has a closed portion 4 of the valve body 2 between the two films F ₁ and F ₂ when the both side edges of the plastic films F ₁ and F ₂ of the flow pipe 1 are high-frequency bonded. The valve body 2 is arranged so as to face downward, so that the opening portion 5 faces upward, and the upper end edge of the valve body 2 is arranged to substantially coincide with the upper end edge of the longer plastic film F ₂ of the flow pipe 1, and in that state In each of the films F ₁ , F ₂ ,
High-frequency adhesive 6 is simultaneously applied to both side edges of F _{3 so} that both side edges of the valve body 2 are adhered to both side edges of the flow tube 1 to be integrally mounted in the flow tube 1.

Further, in this embodiment, the filter body 3 is made of, for example, a plastic non-woven fabric capable of high-frequency adhesion and provided with countless ultrafine filter holes 7 through which gas passes but liquid does not pass. As shown in FIG. 3, a short rectangular rectangular material having the same width as that of the flow pipe 1 and the valve body 2 is folded in half, and an opening 8 for insertion is provided on the upper end side. Has been done. Further, the filter body 3 both plastic film both side edges of the F _1, F ₂ of the flow pipe 1 when the high-frequency bonding, the tip of the both the film F _1, F ₂ is polymerized,
It is arranged in a state of being inserted by the open portion 8, and in this state, high-frequency adhesive 9 is applied to both side edges of the filter body 3 and the upper edge of the insertion so that the opening portion on the distal end side of the flow pipe 1 is The filter body 3 is integrally provided. With this configuration, the inside and the outside of the distal end side of the flow pipe 1 are communicated with each other only through the filter body 3.

The check valve V thus configured is formed between both inner side surfaces of the flow pipe 1 and both outer side surfaces of the valve body 2 as shown in (a) of FIGS. 2 and 7. The fluid can flow only through the gap 10 and the filter body 3.

When the high-frequency adhesive 6 is applied, the free edge F ₁ a not adhered to the valve body 2 should be formed on the upper end of the shorter plastic film F ₁ of the flow pipe 1 as described above. Is important, and the upper end of the longer plastic film F ₂ of the flow pipe 1 and the upper end of the two superposed plastic films F ₃ and F ₃ of the valve body 2 are
High-frequency adhesion 11 is appropriately applied to the respective films to bond them.

Although not shown, instead of the above embodiment, the required lengths of the upper ends of both the plastic films F ₁ and F ₂ of the flow pipe 1 are both separated from the valve body 2 to form free edges. The lengths of the free edges may be shorter than the upper edges of the valve body 2 so that the upper end of the valve body 2 projects from the free edges. At
Reference numeral 12 denotes an adhesive portion in the lower middle portion of the valve body 2 in which both inner side surfaces of the flow pipe 1 and both outer side surfaces of the valve body 2 are partially high-frequency adhered. V
In the figure, reference numeral 13 designates a cut portion such as a perforation or the like laterally provided at a substantially middle portion of the check valve V.

Further, the type of the filter body 3 may be, for example, a filter body having a filter hole 7 that allows only gas and liquid to pass,
Further, not only non-woven fabric but also woven fabric, knitted fabric, and other structures can be used as long as the above-mentioned object of the present invention can be achieved.

Next, the use state of the check valve V for a vacuum packaging bag constructed as described above will be described. As shown in FIG. 4, for example, the check valve V is placed in the opening of the packaging bag P in which the Tsukudani M is stored. Insert the lower end side of the valve V and the distal end side of the flow pipe 1 together with the filter body 3,
High-frequency adhesive B _{1 is} applied to the opening edge portion of the packaging bag P other than the insertion portion.
And closes the opening, inserted a check valve V packaging bag P RF adhesion B ₂ to the check valve V to both outer surfaces of the flow pipe 1 and the both inner side surfaces of the opening edge portion of the packaging bag P in Attached to the packaging bag P
The inside and the outside are communicated with the filter body 3 provided in the check valve V via only the two gaps 10 and 10. In this state, as shown in FIG. 1 or 4, the check valve V
Free edges F ₁ of the plastic film F ₁ of the flow pipe 1
When a is rolled up with a fingertip, the suction nozzle N of the vacuum pump is inserted into the gap 10 formed between the inner surface of the flow pipe 1 and the valve body 2 and the vacuum pump is operated, only a gas is passed through. Due to the presence of 3, only the unnecessary air in the packaging bag P is sucked and discharged to the outside, and the necessary Tsukudani M and the Tsukudani liquid that is slightly left with the Tsukudani M are not discharged at all. Thus, the vacuum packaging is completed by disconnecting the check valve V from the disconnecting portion 13 (see FIG. 5) after only the unnecessary air is completely sucked and removed. That is, in this state, the outside air pressure is higher than the pressure inside the packaging bag P, so the outside air tries to flow into the packaging bag P through the check valve V, but the valve body is folded in two. When the outside air hits the lower end closing portion 4 of the valve body 2, the valve body 2 expands and its outer surfaces (the outer surfaces of the films F ₃ and F ₃ ) are distributed to the flow pipe 1.
7 and the inner surfaces (the inner surfaces of the films F ₁ and F ₂ ) of the check valve V, as shown in (b) of FIG.
Since they are sealed at the same time, the inflow of outside air is surely blocked.

As is clear from the above description, according to the above-described embodiment, the short free end in which the upper edge of the plastic film F ₁ of the flow pipe 1 of the check valve V is pulled downward from the upper edge of the valve body 2. Having formed at the edges F _{1 a,} by increasing turning facilitate fingertips the free Hanaretan edges F _{1 a,} by inserting the suction nozzle N of the vacuum pump very easily, the gap 10 of reliably check valve V obtained Thus, the desired vacuum packaging can be smoothly performed, and the presence of the double-fold closing portion 4 of the valve body 2 can surely achieve the backflow prevention effect of the outside air.

Further, because of the presence of the filter body 3, at the time of vacuum packaging, there is no possibility that necessary contents other than air will be sucked and discharged to the outside, so that the suction function of the vacuum pump is not adversely affected. It has the advantage of eliminating the uneconomical consequences of discharging the necessary contents.

Further, instead of the above-mentioned embodiment, by providing the filter body 3 having the filter hole 7 that allows only gas and liquid to pass,
When only the gas and the liquid are discharged and the object of the vacuum packaging bag is a solid, a granule, a powder or the like, it is possible to surely perform vacuum packaging without discharging these objects.

It should be noted that FIG. 7A shows a state in which the gaps 10 and 10 of the check valve V are opened.

(Effects of the Invention) Since the present invention is configured as described above and used as described above, the check valve has an outstandingly good backflow preventing action, and the vacuum of the vacuum package is excellent. The storage effect can be kept good, and due to the presence of a free end provided on the upper end of at least one of the plastic films of the flow pipe, which is free from the upper end of the valve body, the free end is rolled up and reversed. The suction nozzle of the vacuum pump can be very easily and surely inserted into the gap for fluid circulation of the stop valve, and the vacuum packaging work can be achieved with high efficiency.

Further, since the inside and the outside of the distal end side of the flow pipe are communicated only via a two-fold filter body having a filter hole of a required size, which is provided outside the front end of the flow pipe, the vacuum packaging By using a filter with a filter hole smaller than the size of the target object (including the size of the molecule), unnecessary gas, or only unnecessary gas and liquid are sucked and discharged, and necessary vacuum packaging It is economical because it does not discharge things, and there is no fear of deteriorating the suction function of the vacuum pump,
Further, the filter body can be easily and easily installed, and the maintenance and inspection of the installed state can be easily carried out.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is a perspective view,
2 is an enlarged cross-sectional view taken along the line AA of FIG. 1, FIG. 3 is a disassembled perspective view of the check valve, and FIG. 4 is a partially omitted explanatory view showing a use state of the check valve. FIG. 5 is a partially omitted partial view of a state in which vacuum packaging is completed, FIG. 6 is an enlarged cross-sectional view of an essential part of FIG. 5, and FIG. 7 (a) shows opening of a fluid passage gap in a check valve. FIG. 7B is a partially omitted enlarged sectional view showing a state, and FIG. 7B is a partially omitted enlarged sectional view showing a sealed state of the gap. (Explanation of reference numerals) 1 ... flow pipe, 2 ... valve body, 3 ... filter body, 4 ... closed part, 5 ... open part, 6 ... adhesive part, 7 ... filter hole, 1
0 ...... gap, 11 ...... bonding _{unit, F 1 · F 2 · F} 3 ...... plastic film, _{F 1} a ...... free edge, V ...... check valve.

Claims (4)

[Scope of utility model registration request] 1. A flat fluid flow pipe formed by adhering both side edges of two rectangular plastic films, at least one valve main body installed in the flow pipe, and a tip outer side of the flow pipe. It is composed of a two-fold filter body having a filter hole of a required size installed in the
In the flow direction of the fluid, it is composed of a two-folded piece of a flat plastic film having a closed portion on the lower end side and an open portion on the upper end side, and both side edges of the valve body are both side edges of the flow pipe. Are respectively bonded to each other and are configured to allow the fluid to flow through the gaps respectively formed between both inner side surfaces of the flow pipe and both outer side surfaces of the valve body, and at least the flow pipe at least. The required length of the upper end of one of the plastic films is separated from the valve body, and a roll-up free edge for inserting the tip of the suction nozzle of the vacuum pump is formed in the gap. A check valve for a vacuum packaging bag, wherein the inside and the outside of the distal end side of the flow pipe are communicated with each other only through the filter body. 2. The check valve for a vacuum packaging bag according to claim 1, wherein the filter body is provided with fine filter holes that allow only gas to pass therethrough. 3. The check valve for a vacuum packaging bag according to claim 1, wherein the filter body has a filter hole that allows only gas and liquid to pass therethrough. 4. The free end of the plastic film of the flow pipe is formed to have a length shorter than the upper end of the valve body, and the upper end of the valve body projects from the free end. A check valve for a vacuum packaging bag according to claim 1.