JPS6252022A - Clamping device in vacuum packaging machine - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a vacuum packaging clamp device for supporting a bag containing an object to be packaged in a vacuum. In other words, it is a clamping device that supports the bag so as not to move within the airtight interior until the interior is evacuated.

(Prior art) For example, when trying to vacuum pack granular or powdered materials in a bag, it is necessary to stably support the bag in a vacuum chamber, so a clamp device for supporting the bag is installed in the vacuum chamber. be equipped. Conventionally, a clamp device has a structure in which both side edges of a bag opening are clamped with a pair of clamping metal fittings that utilize the force of a spring, and two clamping bars (one
) (2) A clamping device (original patent application, JP-A-60-2415) has been provided which has a structure in which the entire bag (3) is clamped by the clamping device (2). In the case of the clamping device shown in Fig. 6, a large number of rubber crimping materials (4) (
4)... are provided at equal intervals and in a slightly protruding shape, and the entire bag is spot-held between each of these crimping materials (404)... and the fixing bar (2), so the spring biasing force of the former is utilized. Compared to a clamp device that only clamps both sides of the bag opening with a pair of clamps, the bag can be supported more stably, and a large number of crimping materials (4), (4), etc. can close the opening of the bag (3). Since the pressure is slightly suppressed, there are advantages such as being able to prevent the powdery material in the bag from spewing out from the bag mouth when the pressure inside the chamber (5) is rapidly reduced. In other words, when reducing the pressure inside the vacuum chamber (5), if the bag opening is wide (open),
A large pressure difference is formed between the outside and inside of the powder inside the bag, and the rapid expansion of the air inside the powder causes the powder to blow out of the bag, but as shown in Figures 5 and 5. In the structure shown in Fig. 6, a large number of crimping materials (4) (4)... press the bag opening and form flow resistance at the bag opening, so even if the pressure inside the chamber (5) is suddenly reduced, the bag ( 3) The pressure inside is slowly reduced, so
The air inside the powder does not expand suddenly, and therefore the blowout phenomenon of the powder is prevented. Of course, when the structure described above is used to package food containing liquid, it also has the function of preventing the food from flying out of the bag due to boiling of the liquid.

By the way, when packaging an object containing a liquid in a vacuum, the unavoidable boiling phenomenon of the liquid has a great effect on the finish of the product. In other words, if the liquid inside the bag boils during the process of lowering the vacuum pressure inside the vacuum chamber, the amount of liquid that spews out of the bag will cause uneven measurement of the product, and the seasoning salts and fats and oils contained in the liquid will adheres to the edge of the bag, impairing the sealing accuracy of the bag opening. For this reason, when packaging items containing liquid in a vacuum, generally, in the process of lowering the vacuum pressure, before the liquid boils, a seal bar is operated by the actuator (6) shown in Fig. 5, for example. (7)
The mouth of the bag is sealed to prevent the liquid from spewing out. In particular, liquids with relatively low humidity have a relatively high boiling point, so the vacuum pressure can be lowered accordingly, whereas liquids with high temperature have low viscosity and a low boiling point, so the vacuum pressure can be reduced only slightly. signs of boiling appear. For this reason, in the case of relatively low temperature liquids, it is possible to reduce the vacuum pressure rapidly and boldly, but on the other hand, in the case of high temperature liquids, the vacuum pressure can be reduced by restricting the flow rate of suction air. Control is required to gently lower the For example, in the device shown in FIG. 5, a flow rate regulating valve may be provided in the air suction line (8) as a means for restricting the flow rate of air to be sucked.

However, this method has the drawback that when handling high temperature liquids, it takes a long time for the pressure in the vacuum chamber to drop, resulting in poor efficiency.

(Problems to be Solved by the Invention, etc.) In view of the above points, the present invention has a function of suppressing rapid boiling of liquid, and in particular, has a function of suppressing rapid boiling of liquid, and in particular, prevents the efficiency of packaging items containing relatively high temperature liquid from being extremely reduced. The object of the present invention is to provide a clamp device that can vacuum package without any problems.

(Means for Solving the Problems) In order to achieve the above object, the present invention supports the opening of the bag in a vacuum chamber by a pair of main clamping bars,
The article to be packaged in the bag is placed in a vacuum packaging machine, and an elongated auxiliary bar is provided so as to be freely displaceable in the longitudinal direction along the longitudinal surface of the main clamping bar to which the main crimping material is attached, and the auxiliary bar is fixed. It is supported by the main clamping bar through a means, and an appropriate number of auxiliary clamping materials are provided on the same surface of the auxiliary bar as the main clamping bar on the main clamping bar. .

(Function) According to the present invention, a vacuum is applied by supporting the mouth of a bag containing an object to be packaged in a vacuum chamber with a pair of main pressure bars via an appropriate number of main pressure bonding materials. in this case,
The mouth of the bag is pressed by the main pressure bonding materials arranged at appropriate intervals, and at the same time, the bag is also subjected to pressing force by the auxiliary pressure bonding materials of the auxiliary bar installed in parallel with the main pressure bar, and the bag is formed between each pressure bonding material. The air inside the bag is sucked out through the gap. On the other hand, the above-mentioned auxiliary bar is freely displaceable in the longitudinal direction with respect to the main clamping bar, and can be fixed at any position by means of a fixing means, and the auxiliary crimp material attached to it can also be fixed by the displacement of the auxiliary bar. It is possible to change the distance between the crimp material that is displaced and presses the bag opening. If the interval between the crimping materials that press the bag opening is made smaller, the flow resistance of the passage through which air is removed at the bag opening increases accordingly, and the differential pressure between the outside and inside of the bag can be increased accordingly. In other words, even if the vacuum chamber is rapidly depressurized, the air inside the bag is slowly expelled.

(Example) Examples of the present invention will be described below with reference to FIGS. 1 to 4.

As shown in the figure, a vacuum chamber (10 mm) is connected to a flat plate (1
1) and a seed-shaped lid material (12).

A backing (13) for maintaining airtightness is provided at the opening edge of the lid (12), while a duct (14) for air suction is provided at the center of the board (11). In addition, there is a main clamping bar (15) on one side on the inner surface of [11] in the above board.
is fixed with a cushion spring (16) using a thread, and the main clamping bar (11) on the other side is fixed with a rod (
18) so as to be freely displaceable. A plurality of intake holes (19) (19
)... are opened, and these intake holes are connected to a vacuum source via the tube (2o) and the cavity inside the rod (18), and each intake hole (19) (19)... is opened. The mouth of the sucked bag can be opened and closed by the stroke of the rod (18).

As shown in Fig. 3, each intake hole (19) is provided on the inner surface of the main clamping bar (17) operated by the rod (18).
(19) and three blocks of main crimp material (21
)(21)(21) is fixed. These main pressure bonding materials are made of, for example, rubber or soft plastic having a large coefficient of friction, and are fixed so as to protrude from the surface of the bar. Further, the upper corner of the main clamping bar (17) is shaved off along the longitudinal direction, and an elongated auxiliary bar (25) is slidably provided in the scraped portion, and elongated holes are formed at both ends of the auxiliary bar (25). (26
) (26) so as to pass through each screw (24) (
24) is engaged with the screw hole of the main clamping bar (17) to form a fixing means for the auxiliary bar, while the auxiliary bar (25)
On the inner surface of the main crimp material and the same number of auxiliary crimp materials (27N27
H27). As shown in Figure 1, the sealing means consists of a seal receiver fixed to the board (11) and a base (28).
It consists of a seal bar (30) supported by an actuator (29) provided on the lid (12).

As shown in the figure, the bag (8) is placed between the pair of main clamping bars (15) (1) in the vacuum chamber (10).
7) to support it. In this case, strictly speaking, the opening of the bag consists of three main crimp materials (21) (21) (21) and the same number of auxiliary crimp materials (27) (27) (27
) and the main clamping bar (15) on the negative side, and a gap is formed at the mouth of the bag between each pressure bonding material, so that the bag can be inserted into the vacuum chamber through the duct (14). When a vacuum is applied, the air within the bag is automatically expelled from the gap due to the pressure difference between the inside and outside of the bag.

The excluded air encounters resistance as it passes through the narrow gap, and the air inside the bag is controlled so that its pressure does not drop rapidly. This prevents the phenomenon of particles flying out of the bag.

When handling packaged items containing higher temperature liquids,
As shown in the figure, change the position of the auxiliary bar (25) in the direction of the arrow, narrow the gap between the main crimp material (21) and the auxiliary crimp material (27), and adjust to increase the flow resistance at the bag opening. do. With such adjustment, even if the pressure in the vacuum chamber is rapidly reduced, the pressure in the bag will drop warmly. Then, a signal from a timer set in advance corresponding to the boiling point of the liquid, which varies depending on the temperature, is sent to the actuator (29), which activates the seal bar (30) to seal the bag opening just before the liquid boils.

(Effects) The present invention displaces the auxiliary pressure bonding material (27) fixed to the auxiliary bar (25) in the lateral direction as described above, and adjusts the flow resistance value at the bag opening depending on the temperature of the liquid to be packaged. It was designed to be adjusted. As a possible example for the same purpose, if the flow resistance is adjusted by a flow adjustment valve installed in the passage connecting the empty chamber and the vacuum source, the pressure difference between the outside and inside of the bag may not be too large. Since it is a type that gently lowers the pressure inside the vacuum chamber to prevent formation,
The pressure in a large space including the vacuum chamber must be controlled, which is inefficient, but in the present invention, flow resistance is formed at the bag opening, so the pressure inside the vacuum chamber can be rapidly reduced. This makes it possible to efficiently vacuum package articles containing liquids at different temperatures using the clamp device.

4. Additional relations The present application discloses a method in which a bag containing an object to be packaged is supported in a vacuum chamber by two pressure bars with an appropriate number of pressure bonding materials interposed therebetween, which is the main part of the original invention. In order to achieve the same purpose, a clamping device having the above structure is used as a main part of the structure of the invention.

[Brief explanation of drawings]

Fig. 1 is a side sectional view showing an embodiment of the present invention, Fig. 2 is a developed view taken along line I-I in the previous figure, Fig. 3 is a perspective view of the clamp member, and Fig. 4 is a front view of the previous figure. 5 is an explanatory diagram of a conventional example, and FIG. 6 is a sectional view taken along the line ■-■ of the previous figure. (10)... Vacuum chamber, (11)... Board,
(12) Equipment. (14)...Duct, (15)(17)...Main clamping bar, (21)...Main pressure bonding material, (25
)... Auxiliary bar, (213)... Long hole. (27)...Crimping material, (A)...Bag. Patent applicant Furukawa Seisakusho Co., Ltd. (1 other person) Figure 1

Claims (1)

[Claims] On at least one side of the opposing surfaces of a pair of main pressure bars provided in an airtight vacuum chamber, a large number of block-shaped main pressure bonding materials are arranged at appropriate intervals in the longitudinal direction and protrude appropriately from the opposing surfaces of the bars. After applying a vacuum to the vacuum chamber while supporting the mouth edge of the packaging bag to be fixed and placed in the vacuum chamber by both the main pressure bars via the main pressure bonding material, the bag is fixed and placed in the vacuum chamber. In the vacuum packaging machine, an elongated auxiliary bar is disposed longitudinally displaceably along the longitudinal surface of the main pressure bar to which the main pressure bonding material is attached, and the main pressure bonding material is attached to the vacuum packaging machine. An auxiliary bar is supported on the main clamping bar via a fixing means, and an appropriate number of auxiliary clamping materials are provided in a protruding manner on the same surface of the auxiliary bar as the surface of the main clamping bar on which the main clamping material is provided. A clamp device in a vacuum packaging machine.