JPS5852113Y2 - Cutting and welding equipment in bag making machines - Google Patents

Description

[Detailed description of the invention] This invention mainly relates to an apparatus for manufacturing bags by cutting and welding bag material strips made of thermoplastic synthetic resin films such as polyvinyl chloride, polyethylene, and polyamide, nonwoven fabric, etc. This invention relates to a device for fusing and welding bag material strips made of polyamide nonwoven fabric.

Webs made of this type of non-woven fabric are already used as various packaging materials due to their durability and texture similar to Japanese paper, but only a few are used as bags that have undergone a sewing process. There are almost no heat-welded products on the market.

The reason for this is that when a nonwoven fabric is press-sealed with a heat seal bar, the area remains nonwoven, so
Not only does it have poor heat conduction and welding takes time, but the welded area becomes hard and has a completely different texture from other nonwoven fabric parts because each fiber is consolidated and welded together. This is thought to be due to the disadvantage that the bag loses its flavor as a whole, and the nonwoven fabric itself becomes brittle at the edges of the welded area, resulting in a decrease in strength, making the bag easy to break.

This invention improves the shortcomings of conventional welding equipment. Even thermoplastic non-woven fabrics can be firmly welded without reducing their texture, and they can be heated outside of the welding equipment. The purpose of this is to store the radiant heat from the plate seek in an insulated chamber to improve thermal efficiency.

In this device, two pairs of upper and lower sandwiching type intermittent transfer rollers for intermittently transferring a series of bag material strips are sequentially provided in the transfer direction, and between these two sets of intermittent transfer rollers, Two sets of water-cooled clamping members are installed with a slight gap in the center, and these two sets of water-cooled clamping members are installed with a slight gap in the center to clamp and separate the bag material strip in the transverse direction every time the intermittent transfer roller stops. Among the members, a heat insulating chamber is provided near one set of the water-cooled clamping members, and a slit provided in this heat-insulating chamber and the water-cooling A thin plate type heating plate seek is provided which descends through the gap formed in the holding member and then ascends back into the heat insulating chamber, and the lower limit position of the heating plate thief is such that the middle part of the heating plate thief is A fusing and welding device for a bag making machine, characterized in that the heating plate thieves are provided with an electric heat source member that is located in a heat insulating chamber at all times, and the heating plate thief is located at a position that corresponds to the bag material clamping position by the water-cooled clamping member. be.

This invention will be explained based on the representative embodiment shown in the drawings.

The overall mechanism is as shown in FIG. 1, where 10 and 11 are a pair of upper and lower clamping type intermittent transfer rollers, and a crank 13 is fixed to one end of a main shaft 12 that is continuously rotated by a motor. The intermittent transfer roller 10 or 11 is connected via an electromagnetic clutch brake 30 to the shaft of a sector gear 15 connected to this by a crank rod 14, and a pinion 16 that meshes with this. The clutch is engaged only during forward rotation, and is disengaged during actual rotation to transmit intermittent rotation.

The intermittent transfer rollers 10 and 11 are driven by a transmission mechanism.

Reference numerals 17 and 18 refer to a pair of water-cooled clamping members provided between the intermittent transfer rollers 10 and 11, which are connected to the main shaft 1.
The intermittent transfer roller 10 is
The series of bag material strips F transferred by the two sets of intermittent transfer rollers 10 and 11 are separated by a slight gap 21 (usually 5 mm).
- 3mm) at two places.

Among the pair of water-cooled holding members 17 and 18, a heat insulating chamber 24 is integrally provided above the upper holding members 17a and 18a, and the outer wall of this heat insulating chamber 24 is covered with a heat insulating material 23. Covered.

20 is a thin plate type heating plate seeker, and this heating plate seeker 20
An electric heat source section 22 is integrally provided in the heat insulating chamber 2 at all times.
Located within 4.

The heating plate thief 20 holds the bag material band with the holding member 17.
．． 18, it is equipped so that it descends through the slit 25 provided in the heat insulating chamber 24 and the gap 21 of the clamping member 17, and then rises back into the heat insulating chamber 24. The lower limit position of the heating plate thief 20 is set at a position where the height of about half of the height H of the heating plate thief 20 coincides with the clamping position of the upper and lower water-cooled clamping members 17 and 18. be.

As an example of a mechanism for these operations, the pressing members 17 a and 18 a on the upper side of the heat insulating chamber 24 and the holding members 17 and 18 are compressed by a vertically moving member 26 operated by a cam plate 19 fixed to the main shaft 12. It is configured to be provided via a spring 27.

The vertical movement member 26 may be driven by any suitable means other than the cam plate, such as pneumatic, electromagnetic, etc.

In the device of this invention constructed as described above, a half-folded bag material strip F made of, for example, a polyamide nonwoven fabric, one side of which is a folded edge and the other side of which is an open edge, is transported by an intermittent transfer roller. 10jl sequentially to give sufficient heat to the heating plate thieves 20 to lower the lower member 17b of the holding member 17.18.
, 18b are generally fixed to the machine frame 28, and these water pipes 17C, 18C or the upper clamping member 1 are attached as necessary.
When the entire apparatus is operated by supplying cooling water to the water pipes 17e and 18e of 7a and 18a, the bag material strip F is intermittently transferred in one direction by a predetermined size, and each time the bag material strip F is stopped, the heating plate thief 20 and the upper clamp are first transferred. The members 17a, 18a and the heat insulation chamber 24 descend together, and the upper holding members 17a, 18H
First, the bag material band F is held down by the lower pressing members 17b and 18.
Press onto b and hold.

The heating plate thief 20 further compresses the spring 27 and descends, protrudes from the slit 25 to the outside of the heat insulating chamber 24, and descends into the gap 21 between the pair of clamping members 17 and 18, and finally the heating plate thief 20 The bag material band F, which is in tension due to its lower edge, is thermally fused, and the heating plate thief 20 is cut by the holding member 17.1 at about half the height H of the heating plate thief 20.
8, the melted edges of the bag material strips F that are sandwiched from above and below are further melted by the radiant heat from the side surface of the heating plate thief 20, and the bag material strips F are separated into two upper and lower bags.
The nonwoven fabric fibers that make up the fibers are fused together.

Thus, the heating plate thief 20 rises and the upper clamping member 1
7a and 18a are also separated from the bag material band F and the bag F1 which has been melted and formed, and the heating plate thief 20 is separated from the heat insulating chamber 24.
Return within.

Next, the two sets of intermittent transfer rollers 10, 11 are driven to perform the next transfer.

In this case, the lower clamping member 17b of the loading side clamping member 17
An inclined surface 29 with the upper side on the carry-in side is provided at the corner on the carry-in side, and is formed so that the bag material strip F sent out by the transfer roller 10 is reliably supplied onto the carry-out side holding member 18b. .

The device of this invention, which is structured and operates as described above, has the following effects.

First, the heating plate seek 20 is retracted into the upper heat insulating chamber 24 except when it is lowered for fusing and welding, and the electric heat source member 22 provided on the heating plate seek 20 is always inside the heat insulating chamber 24. Because of this, the radiant heat from the heating plate seek 20 is stored in the heat insulating chamber 24 except when melting and welding, and is not radiated wastefully to the outside. Even though it is a type of non-woven fabric, it can be melted and welded in a short time.

At the same time, the adverse effect of heating the water-cooled holding members 17, 18 with radiant heat when the heating plate seeker 20 is retracted can be extremely reduced.

Furthermore, when the bag material band F is melted, the holding member 17.
The lower edge of the heating plate seeker 20 hits the bag material band F when the bag material band F is securely held in the tensioned state by the actuators 18 and is fused, so that the fusing can be easily and reliably performed.

The effects of the embodiment illustrated above are as follows.

First, the lower edge of the heating plate seeker 20 is connected to the clamping member 17.1.
Since the middle part of the heating plate seeker 20 is lower than the clamping device 8 and almost coincides with the clamping position of the clamping members 17 and 18, the fusing ends of the bag material band F and the bag F1 are almost evenly spaced from the end surface and the top and bottom. When heated, the fibers of the upper and lower bag material bands are evenly melted and fused, and the welded portion is beautiful along the clamping member. Moreover, after the heating plate seeker 20 is raised, the water-cooled clamping member that is clamped Since the parts 17 and 18 are rapidly cooled, they are firmly welded.

In particular, in the case of non-woven fabrics, each fiber is entangled and welded, and welding can be achieved without reducing the feel of the non-woven fabric.

In the example, the best results were obtained when the gap between the two sets of clamping members 17 and 18 was about 3 cm, and the thickness of the heating plate seeker 20 was 1 mm.

In the embodiment described above, the lower edge of the heating plate seeker 20 is further lowered than the clamping position of the clamping members 17, 18,
Although the middle part of the heating plate seek 20 is designed to stop at a position that almost coincides with the clamping position of the clamping member, the middle part of the heating plate seek 20 does not reach the clamping position and is heated slightly below the clamping position. This invention is the same even if the lower edge of the plate seeker 20 stops descending.

At this time, if a heater is inserted into the lower presser members 17 b and 18 b, it is convenient for welding the fused ends of the bag material strip.

Furthermore, even if the arrangement of the illustrated apparatus is reversed and the heating plate seeker 20 is protruded from below the bag material band, the invention remains the same.

The device of this invention can also be used to manufacture bags from ordinary films, flat tubes, etc. and bag material strips.

[Brief explanation of the drawing]

The figures show what is related to this invention, and Fig. 1 is a schematic diagram of the entire mechanism, Fig. 2 is an enlarged sectional view of the main part during transfer,
FIG. 3 is an enlarged sectional view during thermal welding, and FIG. 4 is a perspective view of the bag material band and the bag. In the figure 10.11... Intermittent transfer roller, 17.
18...Water-cooled holding member, 20...Heating plate seek, 21...Gap, H...Height of heating plate seek, F... ...Bag material belt, Fl...
····bag.

Claims (1)

[Scope of utility model registration request] Two pairs of upper and lower intermittent transfer rollers that intermittently transfer a series of bag material strips are sequentially provided in the transfer direction. Two sets of water-cooled clamping members are provided with a slight gap in the center, and these two sets of water-cooled clamping members are equipped with a slight gap in the center to clamp and separate the bag material strip in the transverse direction every time the bag material is stopped. A heat insulating chamber is provided near one set of water-cooled clamping members, and slits are formed in the heat-insulating chamber and in the water-cooled clamping members from the heat-insulating chamber synchronously during the clamping period of the water-cooled clamping members. passing through the gap and descending,
Next, a thin plate type heating plate seek is equipped that ascends back into the heat insulating chamber, and the lower limit position of the heating plate seek is such that the middle part of the heating plate seek coincides with the bag material band clamping position by the water-cooled clamping member. 1. A fusing and welding device for a bag making machine, characterized in that the heating plate seek is provided with an electric heat source member that is always located in a heat insulating chamber.