JPH061211U - Impulse heater for automatic packaging machine - Google Patents

Abstract

(57) [Summary] [Purpose] Prevents the breakage of the heater wire that holds the film bag. [Structure] Gradual arc-shaped portions 11a and 11b are formed on both side edges of a surface of the opening / closing plate 11 to which the heater wire 17 is attached, and the heater wire 17 is attached with bolts 18 along the surface.
Attach by 18 '.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to an impulse heater for an automatic packaging machine, for example, by instantaneously heating and adhering an inlet of a thermoplastic film bag.

[0002]

[Prior art]

 Conventionally, this type of impulse heater for an automatic packaging machine has a strip-shaped heater wire 3 for attaching a film bag to one opening / closing plate 1 via an insulating material 2 as shown in FIGS. 3 and 4. There is. The heater wire 3 is attached to both sides of the rectangular opening / closing plate 1 with mounting bolts 4 and 4 ', as shown in FIG. 3, or as shown in FIG. It is attached at 5, 5 '.

[0003]

[Problems to be solved by the device]

 However, in these conventional examples, when the heater wire 3 is energized each time it is bonded, the heater wire 3 thermally expands and is partially deformed as shown by the bent portions 3a and 3a 'in FIG. In FIG. 4, as shown by the bent portions 3b and 3b ′, the portions other than the central portion where the film bag is attached are deformed, and when the energization is stopped, cooling contracts and returns to the original shape. The heater wire 3 is likely to be broken at the bent portions 3a, 3a ', 3b, 3b', and the life of the heater wire 3 is shortened.

An object of the present invention is to solve the above-mentioned problems and to provide an impulse heater for an automatic packaging machine, which is less likely to be broken even after repeated energization.

[0005]

[Means for Solving the Problems]

 The impulse heater for an automatic packaging machine according to the present invention to achieve the above-mentioned object heats the heating element by sandwiching a thermoplastic film bag between a pair of opening and closing plates having a belt-shaped heating element on one side. In the impulse heater for adhering the film bag, both ends of a surface of the opening / closing plate to which the heating element is attached are arc-shaped, and the heating element is attached so as to cover the front surface of the opening / closing plate and the arc-shaped portion, and the opening / closing is performed. It is characterized in that it is fixed on both sides of the plate.

[0006]

[Action]

 In the impulse heater for the automatic packaging machine having the above-mentioned configuration, since the gentle arcuate portions are formed at both ends of the surface of the opening / closing plate to which the heat generating element is attached, the heat generating element thermally expands gently in the arcuate portion. .

[0007]

【Example】

 The present invention will be described in detail with reference to the embodiments shown in FIGS. FIG. 1 is a configuration diagram of an embodiment in which a part is shown in section, and FIG. 2 is a partially enlarged sectional view thereof. The thermoplastic film bag F containing the filling material is carried in between the opening / closing plates 11 and 12 by a conveying means (not shown). These opening / closing plates 11 and 12 are attached to a pair of drive rods 14 and 15 mounted on a pedestal 13, respectively, and by driving one of the driving rods 14 and 15, the film bag F is opened / closed. It is designed to be pinched between. Further, an insulating material 16 is attached to the pressing portion of one opening / closing plate 11 or attached by another means, and a belt-shaped heater wire 17 is attached in contact with the insulating material 16.

Both end edges of the opening / closing plate 11 are gentle arc-shaped portions 11a and 11b, and a heater wire 17 is arranged so as to cover the surface of the opening / closing plate 11 and the arc-shaped portions 11a and 11b. 17 are attached to both sides of the opening / closing plate 11 by attaching bolts 18 and 18 '. A Teflon sheet (not shown) may be attached to the surface of the heater wire 17 so that the heater wire 17 does not directly contact the film bag F.

With such a structure, when the film bag F containing the filling material is carried into the front surface of the heater wire 17 by the conveying means (not shown), one or both of the opening and closing plates 11 and 12 move to move the film bag F. Clamp the opening. When the heater wire 17 is momentarily energized in this state, the heater wire 17 generates heat and the film bag F is heat-sealed. When the film bag F is heat-sealed, one or both of the opening / closing plates 11 and 12 move to release the pinching pressure of the film bag F, and the film bag F is carried out to the outside of the pinching section by the conveying means (not shown). It

The heater wire 17 thermally expands due to the energization, and the expanded part becomes a bent part 17a, 17b which is a gently curved surface as shown by the dotted line, and when the energization is stopped, the original arc-shaped part 11a, 11b is formed. Return to the shape according to.

In this embodiment, since the bent portions 17a and 17b of the heater wire 17 are gently formed along the arcuate portions 11a and 11b, the thermal expansion thereof is the same as the bent portions 17a and 17b. Is gradually deformed, and the frequency of breakage of the heater wire 17 is reduced even if the deformation is repeated. If a space is provided inside the opening / closing plate 11, the heat dissipation effect is improved and the deformation of the heater wire 17 is reduced.

[0012]

[Effect of device]

 As described above, the impulse heater for an automatic packaging machine according to the present invention has a gentle arc-shaped portion formed on both sides of the surface of the opening / closing plate to which the heating element is attached, and the heating element is attached along the surface of the opening / closing plate. Even if the heating element is thermally expanded due to this, its deformation becomes gentle and the degree of breakage decreases.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment.

FIG. 2 is a partially enlarged sectional view.

FIG. 3 is a partially enlarged sectional view of a conventional example.

FIG. 4 is a partially enlarged sectional view of a conventional example.

[Explanation of symbols]

 11, 12 Open / close plate 11a, 11b Arc-shaped portion 16 Insulation material 17 Heater wire 17a, 17b Bent portion 18, 18 'Mounting bolt

Claims (1)

[Scope of utility model registration request] 1. An impulse heater for sandwiching a thermoplastic film bag between a pair of opening and closing plates having a strip-shaped heating element on one side to heat the heating element to bond the film bag to each other. An automatic wrapping machine characterized in that both ends of a surface on which the heating element is attached are arcuate, the heating element is attached so as to cover the front surface of the opening / closing plate and the arcuate portion, and fixed on both sides of the opening / closing plate. Impulse heater for.