JP4341935B2 - Insulating paper cup and manufacturing method thereof - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a disposable heat-insulating paper cup such as a cup used when injecting hot water for eating and drinking or a cup for hot coffee in a vending machine.
[0002]
[Prior art]
The disposable heat-insulating paper cup as described above forms a heat-insulating layer on the outside of the water-resistant cup body for safety during gripping, but the heat-insulating layer is formed on the outer peripheral surface of the cup body. Since the heat insulating layer forming material is bonded with an adhesive, the cost of the adhesive to be used and the cost of the adhesive coating process become a bottleneck, and there is a problem that it is difficult to reduce the cost.
[0003]
Furthermore, as shown in FIG. 11, when the side edges E and F of the heat insulating layer D composed of the heat insulating sheet B and the outer sleeve C are overlapped with the cup body A and bonded with the adhesive G, the bonding edge H As shown in FIG. 9, when the both side edges J and K of the heat insulating layer D are brought into contact with each other and bonded together, as shown in FIG. 9, the flat heat insulating sheet B and the outer sleeve C are arcuate. The side edges J and K of the heat insulation layer B peel off from the outer peripheral surface L of the cup body A and protrude outwards due to the repulsive force caused by being bent so as to form on the filling machine. When taking out the cups that are stacked at the same time, there is also a problem that obstructs the taking out of each cup, and the outer peripheral surface L is visually recognized. Need to use glue There, the cost is a problem that is further promoted.
[0004]
[Problems to be solved by the invention]
Focusing on the fact that the conventional heat-insulating paper cup has a structure in which the heat-insulating sheet is bonded to the outer peripheral surface of the cup using an adhesive, in the present invention, the material of the heat-insulating sheet has heat-sensitive adhesive ability. Adhesive and its application process are not required, and only by heating and pressurizing processes, the heat insulating sheet is bonded to the outer peripheral surface of the paper cup, or the heat insulating sheet and the outer sleeve are bonded. It is an object of the present invention to be able to reduce the cost by forming the overlapping edge, flattening the overlapping edge, completely bonding the butt edge, and the like.
[0005]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, in the invention of claim 1, the heat insulating sheet having heat-sensitive adhesive ability is welded to the outer peripheral surface of the paper cup by the heat-sensitive adhesive ability of a part of the heat insulating sheet, to the heat insulating sheet (10). The concave portion (15) formed from the adhesive portion (11) that has the adhesive portion (11) that is the applied pressure pressing mark and that adheres the heat insulating sheet (10) to the exterior sleeve (2 ) has a ventilation function. The end portions (6, 7) of the heat insulating sheet (10) all form a stepped portion, and the portions extending from the stepped portion toward the opposite end portion are overlapped with each other and heated. The adhesive layer (8) was formed in the circumferential direction by pressing so as to be approximately the same thickness as the thickness (T) of the heat insulating layer (3) by pressurization. Because of this configuration, the adhesive and its application step can be omitted.
[0006]
In the invention of claim 2, the circumferential adhesive width of the adhesive portion in the generatrix direction with respect to the paper cup outer peripheral surface at both ends in the circumferential direction of the heat insulating sheet is 1% to 10% of the average circumferential length of the paper cup outer peripheral surface. By selecting the range, it was possible to maintain sufficient adhesive strength and sufficient heat insulation and to maintain a good appearance.
[0007]
In the invention of claim 3, both ends in the circumferential direction of the heat insulating sheet are overlapped and bonded to the outer peripheral surface of the paper cup, and the overlapping width in the circumferential direction of the bonded portion is 1% to 10% of the average circumferential length of the paper cup. In addition, the thickness of the overlapped portion is selected within the range of 1.5 times the thickness from the value equal to the thickness of the heat insulating sheet, improving the workability of the crimping process, Is small, and good cosmetics and stackability can be maintained.
[0008]
In the invention of claim 4, the use of an adhesive or the addition of the coating process is performed by adhering an outer sleeve made of a paper material to the outer peripheral surface of the heat insulating sheet at intervals due to the heat-sensitive adhesive ability of the heat insulating sheet. With the required printing, etc., the cosmetics appearance was improved and the feel of the cup was also improved.
[0009]
In the invention of claim 5, the bonding portion between the outer peripheral surface of the heat insulating sheet and the outer sleeve has an interval in either the generatrix direction, the circumferential direction or the direction intersecting with the inner peripheral surface of the outer sleeve. Since it formed in multiple places, many space | gap can be formed between a heat insulation sheet and an exterior sleeve, a heat insulation effect can be improved, and an adhesion part can be functioned also as a reinforcement rib.
[0010]
In invention of Claim 6, the heat insulation effect falls by making the total total area of the adhesion part of a heat insulation sheet, a paper cup, an exterior sleeve, etc. into the area of 30% or less of the area of the internal peripheral surface of a heat insulation sheet. Was prevented.
[0011]
In the invention of claim 7, the heat-insulating sheet is made of a synthetic resin having a heat-sensitive adhesive ability as a main material, and is a flexible sheet body in which an infinite number of air circulation and stagnation voids are formed, that is, a nonwoven fabric, an open cell body. By using closed cells, etc., material costs were reduced, workability was improved, weight was reduced, and heat insulation was improved.
[0012]
According to an eighth aspect of the present invention, in the method for producing a heat insulating paper cup according to any one of the first to seventh aspects, the heat insulating sheet original fabric drawn from the winding roll and the paper sheet for the outer sleeve are overlapped. In combination with heat rolls, heat bonded at the design site, then punched into an outer sleeve shape, transferred to the paper cup molding process, and then bonded to the outer peripheral surface of the paper cup on the heat insulating sheet surface by heating and pressing The heat insulating paper cup can be easily manufactured.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
FIGS. 1 to 4 show an embodiment in which the inventions of claims 1 to 8 manufactured by the manufacturing method according to the invention of claim 8 are applied together. As shown in FIG. The heat insulating layer 3 is formed of a water-resistant paper stock and the outer sleeve 2 is disposed on the outer peripheral surface.
[0014]
The heat insulating layer 3 is disposed between the lower portion of the outward rib 4 on the upper edge of the paper cup 1 and the bottom portion 5, and as described later, at the time of forming the bonding portions 8 at the circumferential ends 6 and 7 of the heat insulating layer 3. The paper cup outer peripheral surface 9 is also adhered.
[0015]
As shown in FIG. 3 , the heat insulating layer 3 is made of a paper material on the outer peripheral surface of the heat insulating sheet 10, and the outer sleeve 2 on which the required printing is performed on the outer surface is an adhesive portion 11 having a space in the circumferential direction. It is constituted by being adhered by.
[0016]
The heat insulation sheet 10 is a synthetic resin having heat-sensitive adhesiveness, that is, heat sealability, for example, polypropylene, polyester, or a non-woven fabric mainly composed of a mixed resin of these resins and paper pulp, open cell, foam made of closed cells. Sheets or composite sheets such as these non-woven fabrics and foamed sheets are appropriately selected and used.
[0017]
The circumferential ends 6 and 7 of the heat insulating layer 3 composed of the outer sleeve 2 and the heat insulating sheet 10 shown in FIG. 3 are overlapped as shown in FIG. 4, and the thickness of the heat insulating layer 3 is heated and pressurized. The adhesive portion 8 having an adhesive width W is formed in the circumferential direction by being press-molded so as to be approximately the same thickness as T, and by this heating and pressurization, the heat insulating sheet 10 has an outer peripheral surface 9 of the paper cup 1 by its own heat-sensitive adhesive ability Also glued.
[0018]
Figure 5 is a cross Do that examples of the adhesion structure of the circumferential both end portions 6, 7 of the heat insulating layer 3 more the outer sleeve 2 and the heat insulating sheet 10, the end portions 6 and 7, the end faces butted, Each end portion is bonded to the outer peripheral surface 9 of the paper cup 1 with a bonding width V in the circumferential direction, and the both end portions 6 and 7 form a bonding portion 12 having a bonding width X as a whole.
[0019]
Te Example smell shown in FIG. 4, the adhesion width W of the adhesive portion 8, the adhesion width X of the adhesive 12, any 1% of the average circumferential length of the outer peripheral surface 9 of the paper cup 1 also to the range of 10% Has been selected. When the bonding width W or X is 1% or less of the average circumferential length of the outer peripheral surface 9 of the paper cup 1, the adhesive force between the outer peripheral surface 9 and the heat insulating sheet 10 is weak, so that the contents can be filled, stored, transported or The heat insulating sheet 10 is easily peeled off due to contact friction with foreign matter when using a paper cup or the like, and if it is 10% or more, the heat insulating property may be impaired.
[0020]
Also, the thickness Y of the bonded portion 8 formed by the overlapping structure shown in FIG. 4 is selected from a value equal to the thickness Z of the heat insulating sheet 10 to 1.5 times the thickness. In order to make the thickness Y less than the thickness Z of the heat insulating sheet 10, a high pressure must be applied, the productivity is reduced, and when the thickness Z is more than 1.5 times the thickness Z, the step becomes large. And the cosmetic properties are impaired, and the stackability when the paper cups 1 are stacked is also significantly deteriorated.
[0021]
In the embodiment shown in FIGS. 1 to 4, the outer sleeve 2 and the heat insulating sheet 10 are equidistant in the circumferential direction as shown in the developed inner surface view of the heat insulating sheet 10 shown in FIG. The heat insulating sheet 10 is bonded to the inner surface of the outer sleeve 2 by the heat-sensitive bonding ability of the heat insulating sheet 10 by a bonding portion 11 which is a streaky heating press mark having a width of about 2 to 3 millimeters reaching the upper edge 14. In FIG. 2, reference numeral 14 </ b> A is an overlapping width portion for forming the adhesive portion 8 shown in FIG. 4.
[0022]
As shown in FIG. 3 and FIG. 4, the adhesive portion 11 that is a heat press mark causes a concave portion 15 that is a heat press mark as a ventilation gap that communicates vertically between the inner surface of the heat insulating sheet 10 and the outer peripheral surface 9 of the paper cup 1. A plurality of strips are formed at equal intervals in the circumferential direction of the outer peripheral surface 9. The air flowing upward through the recess 15 increases the air cooling and heat insulation effects of the outer periphery of the paper cup 1, and the recess formed by the adhesive portion 11. 15 also functions as a reinforcing rib of the heat insulating sheet 10 and improves the strength of the trunk of the heat insulating paper cup.
[0023]
FIG. 6 shows another embodiment of the bonding portion 11 shown in FIG. 2, and the bonding portion 16 between the outer sleeve 2 and the heat insulating sheet 10 similar to the bonding portion 11 shown in FIG. It is formed in the circumferential direction at equal intervals in the busbar direction. In this embodiment, since the concave portion generated by the formation of the adhesive portion 16 is continuous in the circumferential direction and does not communicate with the outside air, the concave portion becomes a stagnant air space, and this stagnant air assists the heat insulating effect. At the same time, the concave portion also functions as a reinforcing rib of the heat insulating sheet, and improves the strength of the body portion of the heat insulating paper cup.
[0024]
An adhesive portion corresponding to the adhesive portion 11 or 16 between the outer sleeve 2 and the heat insulating sheet 10 may be formed in both the busbar direction and the circumferential direction as shown in FIG. As shown in FIG. 9, the cross section may be obliquely crossed in the generatrix direction and the circumferential direction, and as shown in FIG.
[0025]
In the embodiment described above, the heat insulating sheet 10 is formed with the adhesive portions 8, 11, 12 or the adhesive portion 16, etc., but the total of the adhesive portions formed on the heat insulating sheet 10 of one paper cup 1 is total. The area is designed to be 30% or less of the area of the effective inner peripheral surface of the heat insulating sheet 10, and if the total total area of the bonded portions exceeds the value of 30%, the heat insulating property is reduced. The drawbacks that lead to this are noticeable.
[0026]
The heat insulating paper cup according to the present invention is manufactured by the process shown in FIG. 10, and includes a roll roll 17 of the raw fabric of the heat insulating sheet 10 and a paper sheet for the outer sleeve 2 on which necessary printing is performed. The heat insulating sheet material 19 and the paper sheet 20 are pulled out from the winding roll 18 separately, overlapped and passed between the rolls of the heat roll device 21 and thermally bonded at the design site, and then formed into a predetermined shape by the punching device 22 After punching and forming the heat insulation blank 23 comprising the outer sleeve 2 of the heat insulating sheet 10, the heat insulating blank is transferred to a paper cup forming device 24, and the outer peripheral surface of the paper cup is formed on the inner surface of the heat insulating sheet by heating and pressing. It is manufactured by the method of adhering to the sheet.
[0027]
In the embodiment described above, the outer sleeve 2 is used, but it is a matter of course that the outer sleeve 2 can be omitted when the outer peripheral surface of the heat insulating sheet 10 is smooth and has printability and good tactile sensation. When the heat insulating sheet 10 and the outer peripheral surface of the paper cup 1 have sufficient adhesive strength, the heat insulating layer 3 is not locked by the outward ribs 4 and 5 of the paper cup 1 shown in FIG. is there.
[0028]
If the paper cup 1 can be reused as waste paper or is formed only from a biodegradable material, the heat insulating sheet 10 and the outer sleeve 2 can of course be formed from materials that can be used and processed in the same manner. It is.
[0029]
【The invention's effect】
According to the invention of claim 1, since the heat insulating sheet and the paper cup are bonded to each other in part of the heat-sensitive adhesive property of the heat insulating sheet, it is not necessary to use an adhesive, and therefore the bonding step is also omitted. As a result, the manufacturing cost can be reduced.
[0030]
According to the invention of claim 2, the adhesive strength between the heat insulating sheet and the paper cup can be kept within the practical strength, and a sufficient heat insulating effect can be provided, and the appearance can be kept good. If the bonding width in the circumferential direction of the bonding portion is 1% or less of the average circumferential length of the outer peripheral surface of the paper cup, the bonding strength is insufficient, and the practical strength as a heat insulating paper cup cannot be maintained, and the bonding width is the average circle. If it is 10% or more of the circumference, not only the heat insulating property is lowered, but also the cosmetic appearance of the heat insulating paper cup is impaired.
[0031]
According to the invention of claim 3, the workability of the crimping process of the overlapping bonded portion at both ends in the circumferential direction of the heat insulating sheet, the reduction in the level difference of the bonded portion, the improvement of the beauty and the stacking property, and the stack (stacking) The effect of ensuring that the cups are separated and taken out one by one can be added to the invention of claim 2. If the thickness of the bonded part is smaller than the thickness of the heat insulating sheet, it is necessary to apply a strong pressing force, which reduces productivity and the thickness of the bonded part is 1.5 times the thickness of the heat insulating sheet. If it is above, not only the step is large and the appearance is impaired, but also the stackability is remarkably deteriorated.
[0032]
According to the invention of claim 4, the outer sleeve of the heat insulating sheet is provided with the outer sleeve on which the required printing or the like is performed only by the heat-sensitive adhesive ability of the heat insulating sheet, omitting the adhesive and the bonding step with the adhesive. It has the effects of improving the cosmetic appearance and improving the tactile sensation.
[0033]
According to the invention of claim 5, the heat insulating effect can be improved by forming a large number of voids between the heat insulating sheet and the outer sleeve, and the bonded portion can also function as a reinforcing rib. Even a relatively thin and flexible heat insulating sheet has the effect of having sufficient grip strength.
[0034]
According to the invention of claim 6, the total total area of the bonded portions of the heat insulating sheet and the paper cup or the outer sleeve is 30% or less of the area of the inner peripheral surface of the heat insulating sheet. Even if sufficient effects are manifested in each invention of 5, it is possible to satisfactorily prevent a decrease in the original heat insulating effect. When the total total area of the bonded portions is 30% or more of the area of the inner peripheral surface of the heat insulating sheet, a decrease in the heat insulating effect tends to be remarkable.
[0035]
In the invention of claim 7, the heat insulating sheet is made of a synthetic resin having heat-sensitive adhesive ability as a main material, and a flexible non-woven fabric having a countless number of air circulation gaps and air retention gaps, open cells and closed-cell foams, etc. Therefore, it is possible to reduce the material cost for the covering area, and to eliminate the need for an adhesive, and to improve workability and heat insulation.
[0036]
According to the invention of claim 8, a relatively simple process of superimposing the heat insulating sheet and the outer sleeve paper sheet, heat bonding at a required portion, and punching is only added to the existing paper cup molding process. Since the heat insulating paper cup according to each of the inventions of claims 1 to 7 can be continuously produced and the adhesive and its coating process, the adhesive solidifying process and the like can be omitted, the manufacturing equipment and the manufacturing process of the heat insulating paper cup There is an effect that can be simplified.
[Brief description of the drawings]
FIG. 1 is a side view of a heat insulating paper cup as an example of implementation.
FIG. 2 is a developed inner view of an example of a heat insulating sheet.
FIG. 3 is an enlarged schematic view of a cross section taken along line OO in FIG. 1;
4 is an enlarged schematic view of a cross section taken along the line PP in FIG. 1;
5 is a enlarged schematic示図in cross section in FIG. 4 at the same position in the example that different.
FIG. 6 is a developed inner view of another embodiment of the heat insulating sheet.
FIG. 7 is a developed inner view of a modified example of the heat insulating sheet.
FIG. 8 is a developed inner view of another modified example of the heat insulating sheet.
FIG. 9 is a developed inner view of still another modified example of the heat insulating sheet.
FIG. 10 is a schematic process diagram of an example of an embodiment of the invention of claim 8;
FIG. 11 is a schematic cross-sectional view of an example of a bonding structure of a heat insulating sheet end in a conventional heat insulating paper cup.
FIG. 12 is a schematic cross-sectional view of an example of an adhesive structure with different heat insulating sheet ends in a conventional heat insulating paper cup.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Paper cup 2 Outer sleeve 6,7 Circumferential direction both ends 8, 11, 12, 16 Adhesion part 9 Outer peripheral surface of a paper cup 10 Heat insulating sheet 17, 18 Winding roll 19 Heat insulating sheet material 20 Paper sheet 21 Heat roll apparatus 22 Punching apparatus 24 Paper cup forming device V, W, X Adhesion width Y Thickness of the adhesive part of the overlapping part Z Thickness of the heat insulating sheet

Claims (8)

A heat-insulating sheet having a heat-sensitive adhesive ability is adhered to the outer peripheral surface of the paper cup by the heat-sensitive adhesive ability of a part of the heat-insulating sheet, and an adhesive portion (11) which is a pressure-pressing mark applied to the heat-insulating sheet (10). The recessed portion (15) formed from the bonding portion (11) for bonding the heat insulating sheet (10) to the exterior sleeve (2) has a ventilation function, and the end portion (6 of the heat insulating sheet (10) (6). 7) form a stepped portion, and the portions extending from the stepped portion toward the opposite end are overlapped, and the thickness (T) of the heat insulating layer (3) is heated and pressurized. ) And a heat insulating paper cup characterized in that the adhesive portion (8) is formed in the circumferential direction.   The adhesive width in the circumferential direction of the adhesive portion in the generatrix direction with respect to the outer peripheral surface of the paper cup at both circumferential ends of the heat insulating sheet is selected in the range of 1% to 10% of the average circumferential length of the outer peripheral surface of the paper cup. The heat insulating paper cup according to claim 1.   The overlapping width in the circumferential direction of the bonded portion where the circumferential ends of the heat insulating sheet are overlapped and bonded to the outer peripheral surface of the paper cup is selected in the range of 1% to 10% of the average circumferential length of the paper cup. The heat insulating paper cup according to claim 1 or 2, wherein the thickness of the overlapping portion is selected from a value equal to the thickness of the heat insulating sheet to 1.5 times the thickness.   The heat insulating paper cup according to claim 1, 2 or 3, wherein an outer sleeve made of a paper is adhered to the outer peripheral surface of the heat insulating sheet with a space therebetween due to the heat-sensitive adhesive ability of the heat insulating sheet.   5. The bonding portion between the outer peripheral surface of the heat insulating sheet and the outer sleeve includes a plurality of locations having intervals in any of the generatrix direction, the circumferential direction, and the direction intersecting with the inner peripheral surface of the outer sleeve. Insulating paper cup as described.   6. The heat insulating paper cup according to claim 4 or 5, wherein the total total area of the bonded portions of the heat insulating sheet and the paper cup, the outer sleeve, etc. is 30% or less of the area of the inner peripheral surface of the heat insulating sheet. .   The heat insulating property according to any one of claims 1 to 6, wherein the heat insulating sheet is made of a flexible sheet having a synthetic resin having a heat-sensitive adhesive ability as a main material and an infinite number of air circulation and stagnant voids. Paper cup. In the manufacturing method of the heat insulation paper cup in any one of Claim 1 thru | or 7, From the winding roll of the raw fabric of the heat insulating sheet which has heat-sensitive adhesive ability, and the winding roll of the paper sheet for exterior sleeves, Separately drawn heat insulating sheet material and paper sheet are overlapped and passed between heat rolls and heat bonded at the design site, then punched into an outer sleeve shape, transferred to the paper cup molding process, and insulated by heating and pressurization A method for producing a heat insulating paper cup, characterized in that, on the sheet surface, the sheet is adhered to an outer peripheral surface forming sheet of the paper cup.

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