JPS5971815A - Pressurizing body for heat sealing - Google Patents

Abstract

PURPOSE:To obtain a pressurizing body permitting strong adhesion particularly even in the presence of intermediate foreign elements by a construction wherein the body has on the surface thereof a number of sharp serrations which can penetrate into the interior of the film on the side not contacting with the pressurizing body, when heat-sealing the plastic films. CONSTITUTION:A pressurizing body 1 has on the surface thereof a number of sharp serrations 2, which are so formed that they can penetrate into a plastic film 3' on the side not contacting with the pressurizing body 1 when heat-sealing plastic films 3, 3'. The pressurizing body 1 may be formed of, for example, the surface of a hot plate or hot roll which is etched into a pear-skin or sandy texture with sharp serrations, or the surface of such a member on which is attached an abrasive such as sand paper having a number of sharp minerals bonded onto a substrate. By so doing, it becomes possible to form a three-dimensional satin finish or aventurine pattern in the sealed portion while making strong heat sealing simultaneously.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a pressurizing body for heat sealing, and more particularly to a pressurizing body for heat sealing that is particularly useful for heat sealing when contaminants are present in the middle, that is, sealing off foreign substances. It is.

In this specification, the pressurizing body refers to a body that comes into contact with the heat-sealed portion during heat-sealing of a plastic film having heat-e-μ properties and directly applies heat or pressure to the heat-sealed portion. Therefore, typical examples of pressurizing bodies include heating bodies such as hot plates and hot rolls. A pressure body that is a body is also a pressure body referred to in this specification.

Conventional heat-sealing methods for glass films include hot plate bonding and impulse bonding. For example, the film is stacked between hot plates with smooth surfaces and heat-sealed by applying pressure. However, depending on the material and thickness of the film, Depending on the size, etc., this adhesive strength may not be sufficient. In order to improve this, so-called multi-point heating plates with a large number of convex portions on the surface of the hot plate, and heat seams μ with serrations on the hot plate surface have also been used. However, the tips of the protrusions and the jagged peaks at the multi-points have smooth surfaces, so these merely increase the pressure by reducing the contact area with the film. 0 In this way, all conventional heat sealing methods simply heat seal plastic films by applying heat and pressure, so in the case of contaminant sealing, contaminants are present between the films being heat sealed. Therefore, the adhesive force was always insufficient. For example, during packaging of powdered medicines, fruit juices, etc. using plastic films, the chemicals and fruit juices very easily adhere to the heat-sealed portion, so heat-sealing in this case poses a very serious problem. Currently, many vapor-deposited plastic films with a metal vapor-deposited layer such as A4 on the surface are used as packaging materials, but these vapor-deposited plastic films generally have a metal vapor-deposited layer on the inside. Heat sealing is almost impossible, and is only possible when the metal vapor deposited layer is so thin that it can be seen through, and the adhesive strength in this case is not necessarily sufficient.

This invention eliminates the above disadvantages and provides extremely strong adhesion despite the presence of metallized layers, powders, liquids, non-heat-sealable layers, membranes, films, and various other contaminants. The present invention provides a pressurizing body for heat sealing that can apply force.

That is, the present invention is a pressure body having a large number of sharp protrusions on its surface, and the sharp protrusions extend into the inside of the plastic film on the side that does not come into contact with the jB pressure body when the plastic film is heat-sealed. This is a pressurizing body for heat sealing, which is characterized in that it can be bitten into.

In the following, this invention will be explained with reference to the drawings.

FIG. 1 is a partially enlarged sectional view showing an example of the pressurizing body of the present invention. indicates a pressurizing body, and 2 indicates a sharp protrusion.

The pressurizing body 1 of the present invention has many sharp protrusions 2 on its surface. For example, the surface of a hot plate or hot roll is etched with sharp protrusions to give it a pear-like or sand-like appearance, or an abrasive material such as a sand plate with many sharp ores attached to the base material. Note that a large number of sharp protrusions 2 may be provided regularly over the entire surface of the pressurizing body 1. The sharp protrusions 2 on the surface of the pressurizing body 1 may be The tip of the protrusion must not only be in contact with the plastic film, but also be able to be inserted into the plastic film.This means that if the tip of the protrusion is not able to be inserted into the plastic film, it will not be able to be used as a conventional multi-point. This is because the sharp protrusion 2 on the surface of the pressurizing body 1 is substantially the same as that of the pressurizing body 1 and the pressure during heat sealing is simply increased. It must be long enough to penetrate into the inside of the plastic film.However, the length of each of these sharp protrusions 2 may be uniform or may vary. Next, an example of heat-sealing a vapor-deposited plastic film with a metal vapor-deposited layer on the inside using the pressurizing body of the present invention will be described with reference to FIGS. 2 and 5.

Figure 2 shows an example of a state in which sharp protrusions are dug into the plastic film during heat sealing, and Figure 3 shows an example of a state in which sharp protrusions bite into the plastic film after heat sealing. FIG.

■ As a pressurizing body, use a ribbon heater with a smooth surface on one side and a pressure body on the other.1゜ ■ A thin fabric made of glass fiber is used on the surface of the ribbon heater to prevent the heat-sealed plastic film from adhering. The pressure body to be provided is a rubber plate with sandpaper on the surface. In this case, the large number of ores present on the surface of the sandpaper form two sharp protrusions. ■ As a vapor-deposited plastic film. A polyethylene film 3.3' having a thickness of 50 μm and an Ag vapor deposited layer 4 having a thickness of 10 OA provided on one side thereof are used.

In this case, the Ag vapor deposited layer 4 is translucent and can be seen through. Two A4 vapor deposited polyethylene films are placed on the ribbon heater with the A4 vapor deposited layer 4 on the inside, and at the same time a pressure is applied from above with a pressure body. Heat the ribbon heater.

■ During the heating and pressurization described above, many ores of sandpaper on the surface of the pressure body are sharp protrusions 2, so as shown in FIG. 2, the polyethylene film 5' on the side not in contact with the pressure body Penetrate deep into the interior. In the figure, 5 is a part into which the sharp protrusion 2 is inserted.

- The Ag vapor deposited layer 4 in the biting portion 5 is pushed away and destroyed by the biting of the sandpaper ore.

■ When putting the ore into the sandpaper, it is heated υ
Upper and lower polyethylene films 5.31 are wedged in part 5
After the pressurizing body is removed in this way, the inserted portion 5 of the ore is completely fused and solidified as shown in FIG.

■ AI-deposited polyethylene film A7, which has extremely strong adhesion when heat-sealed as described above? Heat sealing can be performed with the vapor deposited layer 4 on the inside.

■ The completed heat-sealed part is covered with the sandpaper ore and the polyethylene film 6.31
The part where is fused and integrated, that is, the biting part 5 is A4
Since the vapor deposited layer 4 has been pushed away and destroyed, it becomes transparent, and the parts where the ore has not penetrated remain as originally translucent. Therefore, the heat-sealed portion is a heat-sealed portion that exhibits a pear pattern or sand pattern in appearance.

[Phase] In addition, in the completed heat-sealed part, the part where the ore of the sandpaper is inserted is under greater pressure during heat sealing than the non-indented part, and the part where the ore is inserted becomes thinner after heat sealing. The surface of the plastic film has many irregularities, giving it a three-dimensional pear pattern or sand pattern. Depending on the degree of pressure applied thereto, the upper and lower plastic films 3.31 either penetrate through the Ae vapor deposited layer and are fused, or are not fused at all.

As explained above, the pressurizing body of the present invention differs from the conventional heat sealing method in which heat sealing is performed simply by applying heat and pressure. Heat sealing is performed by inserting the plastic film inside the plastic film on the side that does not come into contact with the pressure body, which is completely different from conventional methods. In addition, this invention has the following remarkable effects compared to the conventional ones: (1) When the pressurizing body of this invention is used, the part where the sharp protrusion is inserted in the dirt seal is pushed away and destroyed. At that point, the upper and lower plastic films are completely fused and solidified. ■Since there are many sharp protrusions, there are many parts where the upper and lower plastic films are fused and integrated, resulting in an extremely strong adhesive force across the entire plastic film. ■The pressurizing body of this invention can of course be used not only in the case of contaminant seals but also in the absence of ordinary contaminants. The adhesive force is extremely strong compared to heat sealing. This is because the use of the present invention is not simply heat sealing by heating and pressurizing, but heat sealing by inserting sharp protrusions. ■With conventional methods, in order to increase the adhesive strength, it is necessary to increase the temperature and pressure as well as increase the time, but if these are too harsh, the distortion due to heat becomes too large and the appearance becomes unsightly. The so-called cut off at the boundary between the beat-sealed part and the non-heat-sealed part (or edge cut f1.)
However, when this invention is used, the heat sealing strength is extremely strong compared to the conventional method, even without increasing the temperature, pressure, time, etc. It can be sealed.

■Also, the operation of heat sealing itself is extremely simple and is completely different from conventional methods. ■This invention can be used not only for contaminant sealing but also for ordinary heat sealing, so it can be used to heat seal both sides of a plastic film, regardless of whether the heat sealable plastic film is a single substance or a composite with other materials. It is what makes it possible. ■
Therefore, for example, when forming a package using a plastic film composite, heat sealing can be performed between the surfaces of the composite, or between the front and back surfaces of the composite.

As described above, the pressurizing body of the present invention is a pressurizing body whose surface condition is essentially different from that of conventional pressurizing bodies, and is an invention that brings about numerous heat sealing effects. This is an epoch-making invention that can greatly contribute to the removal of foreign matter stickers.

In addition to the numerous effects described above, the present invention also brings about the following unique effects. In other words, if this invention is used, the part where the sharp protrusion bites will naturally be under greater pressure than the part where it does not bite, so after heat sealing, that part will become thinner and the surface of the plastic film will be covered with many parts. For example, when a pressurizing body with sandpaper on the surface is used, it becomes a three-dimensional bundling pattern or a sandpaper pattern.According to the present invention, the plastic At the same time as the heat sheet of the film, it is also possible to process the heat-sealed portion with a three-dimensional binding pattern or sand pattern.

Therefore, when this invention is used to heat-seal the entire surface of a plastic film, the plastic film is processed to have a three-dimensional bundled pattern or sand grain pattern and to be laminated.

It goes without saying that the present invention can be applied to any of heat sealing of the peripheral edge, back surface, etc. in the formation of a packaging bag, lamination, and heat sealing as a three-dimensional bundle pattern or sand grain pattern processing.

Further, in the present invention, it goes without saying that heat sealing may be performed while employing an intermediate such as Teflon as a mold release material between the pressurizing body and the plastic film, as has been conventionally done.

Heat seal strength (adhesive strength) comparison example: /7”)V
A nylon film with a thickness of 15μ and an unstretched polypropylene film with a thickness of 50μ were laminated together, and a Cr vapor deposited layer with a thickness of 50A was formed on the unstretched polypropylene film. Sump/L/2 has a protective layer of 0.1μ thick made of urethane resin on the Cr vapor deposited layer of Sump/L/1, and Sample 2 has the Cr vapor deposited layer on the inside. With the protective layer on the inside, heat sea according to the following conditions! Shishita.

2 Heat Sea machines, Fujiin Dakii Sealer F manufactured by Fudo Seisakusho Co., Ltd. 1. -200-10 type human seal conditions,
140°C x 1.5 sand pressure car model-specific pressure heat sealing is based on the above conditions, and as a pressurizing body, one side is a ribbon heater equipped with a thin glass fiber fabric on the surface, which is equipped with the same model. On the other hand, when the glass fiber is still attached to the surface of the rubber plate equipped with the same model, that is, in the case of conventional heat sealing, and on the other hand, 60 mesh sandpaper is applied on the glass fiber. This is the case where it is provided.

The heat seal strength in each case above was as shown in the table below.

The numbers in the table indicate heat seal strength (g/1S-).

[Brief explanation of drawings]

FIG. 1 is a partially enlarged sectional view showing an embodiment of the present invention. FIG. 2 is a partially enlarged sectional view showing an example of a state when heat sealing is performed using the present invention. FIG. 3 is a partially enlarged cross-sectional view showing an example of the state of a portion into which a sharp protrusion of a pressurizing body is inserted after heat-sealing/sealing using the present invention. 1... Pressure body 2... Sharp protrusion 6.6'... Polyethylene film 5... Film 4...
・Al vapor deposited layer 5 ... Sharp protrusion biting part Patent applicant Hikaru Atsushi Co., Ltd.

Claims (1)

[Claims] A pressurizing body that has many sharp protrusions on its surface, and the sharp protrusions can penetrate into the inside of the plastic film on the side that does not come into contact with the pressurizing body when the plastic film is heat-sealed. A pressurizing body for heat sealing, characterized in that: