JPS5839892Y2 - bag making machine - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a machine for manufacturing square bottom bags from a bag material strip made of thermoplastic synthetic resin.

An example of this type of prior art can be found in Japanese Patent Publication No. 15715/1973, which is a non-welding insert plate inserted from the side edge of the bag material band into the gusset folding part of the bag material band. is used as a pedestal for the welding plate and as a rubber plate. When the bag material strip is made of tube material, it is a square bottom bag with a bottom gusset, and when the bag material strip is a film material, it is a square bottom bag with side gussets. This is a device that manufactures square bottom bags, and it performs fusing and cutting at the same time as welding, and in the post-welding process, cuts near or at the center of the weld.
This is conventional technology.

In the conventional square bottom bag making machine described above, the entire insertion plate is made of rubber, and as the welding plate is press welded, the upper and lower surfaces of the rubber insertion plate are It is a component that deteriorates under pressure and heat and is frequently replaced, and the current situation is that the entire insertion board is replaced each time it is replaced.The prior art has a drawback in this respect from the perspective of resource conservation. are doing.

This invention improves the insertion plate of the prior art described above, improves the above-mentioned drawbacks of the insertion plate, and makes only the part of the insertion plate that actually corresponds to the welding plate made of rubber, minimizing the number of parts that need to be replaced. The purpose of this invention is to provide a bag making machine that saves resources for inserting plates.

This invention consists of a non-weldable insertion plate that is inserted from the side edge of the bag material band into a gusset folded part formed by folding the side edge of a bag material band made of thermoplastic synthetic resin, and a bag making device comprising a heat welding device having a pair of welding plates that move and heat-weld at least the gusset folding portion by simultaneously pressing it against the insertion plate from above and below at an angle of 45 degrees with respect to the side edge of the bag material band. In the machine, the non-weldable insertion plate is entirely formed of a thin metal plate, and is elastically held horizontally on the machine frame.
A notch is formed in the metal plate, which is inclined at 45 degrees from the outer edge of the metal plate located on the valley side of the gusset folding part to the side edge of the bag material band, and is made of heat-resistant rubber. A plate is replaceably loaded into the notch, and a heat-resistant non-fusion sheet material covering the upper and lower surfaces of the rubber plate is pasted over the metal plate and the rubber plate, and the rubber plate is This bag making machine is characterized in that it serves as a pedestal for the hot melt signboard.

Next, embodiments of this invention will be explained based on the drawings.

First Embodiment (See Figures 1 to 4) In the figure, F is a film strip made of thermoplastic synthetic resin, and this film strip F is folded in half and the folded side edges are further folded in the middle to form a gazette. Folding part F.

It is closed and transported intermittently along its length.

The above gazette folding part F.

A non-welding insertion plate 10 inserted from the side edge side of the film strip F into the gusset folding part F is formed entirely as a rectangular thin metal plate 11, and is elastically held horizontally on the machine frame.

From the outer edge 12 of the metal plate 11 located on the valley F0 side, a notch 13 in the shape of a slant at 45 degrees with respect to the side edge of the film strip F is formed on this metal plate 11. .

Reference numeral 14 denotes a heat-resistant rubber plate, which matches the planar shape of the notch 13 and is inserted into the notch 13 so as to be replaceable.

Teflon tape 15 covering the upper and lower surfaces of this rubber plate 14
has an adhesive layer on one side and its planar shape is larger than the planar shape of the notch, and is pasted across the rubber plate 14 and the metal plate 11, and the rubber plate 14 is attached to the notch 1.
It is stuck inside 3.

Above and below the rubber plate 14, a pair of welding and fusing blades (a type of welding plate) 16 is installed on the machine frame so as to be movable up and down. It is in the shape of a ridge inclined at 45 degrees.

From the position where this welding fusing blade 16 is provided, on the delivery side of the bag having a dimension smaller than or equal to an integer multiple thereof, the film Separate linear welding cutting blade 1 in the direction transverse to band F
7 is a provision.

Teflon cloth 18 having a mold release effect is stretched between the welding cutting blades 16 and 17 and the film strip F, respectively.

In order to manufacture a square bottom bag with side gussets using the bag-making machine having the above configuration, the gusset folding portion F of the film strip F is required.

The non-welding inserting plate 10 is inserted in advance, and each time the film strip F stops moving, the rubber plate 10 of the inserting plate
The pair of welding cutting blades 16 are moved toward the upper and lower surfaces, and the tube strip F is attached to the insertion plate 10 through the Teflon cloth 18.
Press to weld and cut.

At this time, the gazette folding part F.

Of the four layers of film, the upper and lower two are separated by the rubber plate 14 of the insertion plate 10, and the A-shaped welding blades 16, 16 are used to cut the gusset folding portion F.

This fold-in part F of the gazette is inclined at 45 degrees from the valley to the side edge.

are welded and cut in a triangular shape.

In the subsequent process, the film strip F is fused in the transverse direction by the fusion welding blade 17 that passes through the apex of the A-shaped fusion cut, and bags are sequentially manufactured.This bag is a square bottom bag with an inverted Y-shaped weld on both sides. becomes.

Due to continuous use, the elasticity of the rubber plate 14 of the insertion plate 10 deteriorates, and when replacing it, either remove the insertion plate 10 from the machine frame or leave it as it is and peel off the Teflon tape 15 from the upper and lower surfaces of the rubber plate 14. If this happens, the holding force of the rubber plate 14 to the metal plate 11 is lost, so the rubber plate 14 is removed from the metal plate 11 and replaced with a new rubber plate 14.

In the above embodiment, the film strip was welded and cut at the same time, but even if the center of the welded part is cut after welding,
The present invention is also the same even if welding plates that perform only welding at a 45° angle are attached above and below, and no melting or cutting is performed in this part.

A second embodiment (see FIGS. 5 and 6) is an apparatus for manufacturing a square bottom bag using a tube strip with gusset folds on both sides as the bag material strip, in which the insertion plate 1
0 is the left and right gazette folding part F.

A pair of left and right insertion plates 10 are provided, and each insertion plate 10 has a linear notch 13 inclined at 45 degrees from one side edge thereof. Rubber plates 14 are respectively inserted and integrated with the metal plates by adhesive Teflon tape 15 as in the first embodiment.

Therefore, in this embodiment, the pair of welding plates, that is, the welding cutting blades 16, are also straight at an angle of 45 degrees, and pass through the intersection of these welding cutting blades 16 and the valley part of the gusset fold, As in the first embodiment, the welding plate for sealing the bottom in the transverse direction of the tube strip is provided at a position on the delivery side that is an integral multiple of the size of the bag than the position of the 45° inclined welding plate 16.

When a square bottom bag is manufactured using this apparatus, a bag having an H-shaped welded part on the bottom is manufactured.

This device, which is constructed and operates as described above, has the following effects.

Of the non-welding insert plates, a rubber plate is used only for the part corresponding to the welding plate, and this rubber plate is replaceably inserted into the notch of the metal plate, so by welding,
If this rubber plate deteriorates, you can simply replace the rubber plate with a new one without replacing the entire insertion plate.
It is possible to save resources for insert plates.

Furthermore, the metal plate that holds the rubber plate in the notch is thin, and this notch forms the gusset fold F of the bag material strip.

Since the welding blade is inclined at 45 degrees from the outer edge 12 of the metal plate 11 located on the valley side F1 of the film strip F to the side edge of the film strip F, the welding blade can reliably move from the valley of the gusset fold to the side edge. In such a state that it bites into the upper and lower surfaces of the rubber plate 14,
A welded part inclined at 45° can be formed at the gusset fold part of the bag material band.

Furthermore, since the upper and lower surfaces of the rubber plate 14 are covered with a heat-resistant, immovable adhesive sheet material such as Teflon tape, the bag material band is attached to the upper and lower surfaces of the rubber plate during welding of the bag material band. The intermittent transfer of the bag material strip can be carried out without any trouble without heat-sealing, and when the rubber plate is removed from the metal plate, these sheet materials can be peeled off from the top and bottom surfaces of the rubber plate. The rubber plate can be taken out from within the notch, and the rubber plate can be quickly replaced with a new one.

In addition, since the rubber plate is simply attached to the metal plate using a sheet material such as Teflon tape, it may be extremely thin, for example, about 1 mm in thickness, and accurate welding can be performed up to the valleys of the gusset.

Incidentally, if the outer edge 12 of the metal plate 11 and the short edges connected thereto are covered with Teflon tape as described in the first embodiment,
The bag material strip can be smoothly and intermittently transferred without being damaged by the peripheral edge of the metal plate 11 or fused by frictional heat.

[Brief explanation of drawings]

The figures relate to this invention: Fig. 1 is an overall plan view of the first embodiment, Fig. 2 is an enlarged plan view of the insertion plate, and Fig. 3 is obtained in the first embodiment. Perspective view of square bottom bag,
FIG. 4 is a side view of the main parts of the first embodiment, and FIG. 5 is a side view of the main parts of the first embodiment.
FIG. 6 is a perspective view of a square bottom bag manufactured according to the embodiment, and a plan view of an insertion plate used in the second embodiment. In the figure, 10...insertion plate, 11...metal plate, 13...notch, 14...rubber plate, 15... Teflon tape.

Claims (3)

[Scope of utility model registration request] (1) A non-weldable insertion plate inserted from the side edge side of the bag material band into the gusset folded part formed by folding the side edge of the bag material band made of thermoplastic synthetic resin; A bag making machine including a heat welding device having a pair of welding plates that moves and heat-welds at least the gusset folding portion by simultaneously pressing it against the insertion plate from above and below at an angle of 45 degrees with respect to the side edge of the bag material band. In the above, the non-weldable insertion plate is entirely formed of a thin metal plate, is elastically held horizontally on the machine frame, and extends from the metal plate edge located on the valley side of the gusset folding portion.
A notch is formed in this metal plate that is inclined at 45 degrees with respect to the side edge of the bag material band, and the heat-resistant rubber plate is
A heat-resistant non-fusible sheet material that is replaceably loaded into this notch and covers the upper and lower surfaces of this rubber plate is pasted over the metal plate and the rubber plate, and the rubber plate is A bag making machine characterized by being used as a stand for a signboard. (2) The bag making machine according to claim 1, wherein the heat welding plate is a welding blade. (3) The bag making machine according to claim 1, wherein the sheet material is a Teflon tape.