Low-temperature rapid bottle washing process for trademark coated with UV gloss oil and composite label removing auxiliary agent

Abstract

The invention provides a low-temperature rapid bottle washing process for a trademark coated with UV gloss oil and a composite label-removing auxiliary agent, and the process comprises the following steps: 1, raising the temperature of alkali liquor of a bottle washing machine to 60 DEG C, adding sodium carbonate, sodium silicate and alkyl glycoside (APG) in the composite label-removing auxiliary agent, and stirring until the sodium carbonate, the sodium silicate and the alkyl glycoside (APG) are completely dissolved; 2, heating to 80 DEG C, adding sodium gluconate and trisodium citrate, and continuously stirring for dissolving; 3, further heating to 88-90 DEG C, adding EDTA (Ethylene Diamine Tetraacetic Acid), DTT (Dithiothreitol) and urea, keeping constant temperature, uniformly mixing, and feeding into a bottle for production; 4, bottle washing process parameters are as follows: the concentration of the alkali liquor is 2.8-3.2%, the temperature is 88-90 DEG C, the addition amount of the composite label removing auxiliary agent is 2.0-2.5%, and the bottle washing speed is 2.8-3.0 million bottles per hour. Compared with the prior art, the method has the beneficial effects that efficient label removing and cleaning effects are achieved, meanwhile, energy consumption is reduced through low-temperature operation, the risk of high-temperature alkali liquor splashing during working is avoided, and the service life of the device is prolonged. The accident rate of scalding workers is reduced, and the production safety is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of beverage bottle packaging, and particularly to a low-temperature and rapid bottle washing process for coating UV varnish trademarks and a composite label removing aid. Background Art

[0002] With the rapid development of the food and beverage packaging industry, the demand for the recycling of glass bottles has increased sharply. However, trademarks coated with UV varnish, that is, photocurable coatings with high crosslinking degree, have become a difficult point in the bottle washing process. Traditional bottle washing technologies rely on soaking in high-temperature alkaline solutions (containing sodium carbonate, sodium silicate, etc.) at ≥95°C for a long time (≥15 minutes). The glue is softened and the label is peeled off through a strong alkaline environment. However, this process has the following defects: high energy consumption: high temperature leads to a large amount of steam consumption, significant heat loss of equipment, and increased production costs; high label residue rate: due to the dense crosslinked structure of the UV varnish coating, traditional alkaline aids cannot effectively break its bond with the bottle body, and manual secondary label peeling is required, with the glue residue amount as high as 2-5%; risk of bottle body damage: long-term corrosion by high-temperature alkaline solutions leads to an increase in microcracks on the surface of glass bottles and a decrease in the reuse rate.

[0003] Existing label removing aid formulations have the following limitations: insufficient low-temperature activity: the permeability and reaction activity of traditional aids decrease significantly at ≤90°C, and they cannot simultaneously break the UV varnish layer and the glue; functional singularity: single components only target a certain link of the glue or the coating, lacking synergistic effects. Summary of the Invention

[0004] Aiming at the problem that the existing bottle washing process cannot effectively remove trademarks coated with UV varnish, the present invention provides a bottle washing process for rapidly eluting UV varnish trademarks under low-temperature (≤90°C) conditions and its composite label removing aid. By optimizing the alkaline solution temperature, the aid formulation and the synergistic action mechanism, the trademark glue is completely de-sticked, and the printed layer is removed without damage, while reducing energy consumption and production costs.

[0005] The technical solution of the present invention is realized as follows:

[0006] The present invention provides a low-temperature and rapid bottle washing process for coating UV varnish trademarks, comprising the following steps:

[0007] I. Raise the alkaline solution temperature of the bottle washing machine to 60°C, add sodium carbonate, sodium silicate and alkyl polyglycoside (APG) in the composite label removing aid, and stir until completely dissolved;

[0008] II. Raise the temperature to 80°C, add sodium gluconate and trisodium citrate, and continue to stir and dissolve;

[0009] III. Further raise the temperature to 88-90°C, add EDTA, dithiothreitol (DTT) and urea, keep the temperature constant and mix evenly, and then feed the bottles for production;

[0010] IV. The bottle washing process parameters are as follows: caustic liquor concentration 2.8 - 3.2%, temperature 88 - 90°C, compound label - removing aid addition amount 2.0 - 2.5%, bottle washing speed 28,000 - 30,000 bottles per hour.

[0011] In one embodiment, during the bottle washing process, the soaking time of the caustic liquor on the UV varnish label is 5 - 8 minutes, and after elution, the printing on the surface of the label is intact and the glue is completely de - adhered.

[0012] In one embodiment, the bottle washing process further includes a pre - washing step. The caustic liquor concentration of the pre - washer is 3.0 - 3.5%, temperature 90 - 93°C, and the compound label - removing aid addition amount is 2.0 - 2.5%.

[0013] In one embodiment, the dissolution aid is heated in stages to activate the label - removing functions of different components in sequence. Among them, the penetrant is dissolved at 60°C, the chelating agent is activated at 80°C, and the cross - link breaker is triggered at 88 - 90°C.

[0014] On the other hand, according to the present invention, a compound label - removing aid is provided. The compound label - removing aid includes the following components by mass percentage:

[0015]

[0016]

[0017] In one embodiment, the EDTA is sodium ethylenediaminetetraacetate. Its synergistic effect with dithiothreitol (DTT) is used to break the cross - linked structure of the UV varnish coating and simultaneously decompose the viscous components of the label glue. Among them, EDTA chelates metal ions to damage the UV varnish coating, and DTT reduces the disulfide bonds in the glue. The superposition of the two achieves the dual effects of "coating peeling + glue de - adhesion".

[0018] In one embodiment, the alkyl polyglycoside (APG) is a non - ionic surfactant with a C8 - C12 chain length, which is used to improve the permeability and dispersibility of the caustic liquor to the UV varnish layer.

[0019] On the other hand, according to the present invention, an application prepared by the low - temperature and rapid bottle washing process is provided. It is applicable to the low - temperature elution of UV varnish labels coated on the surfaces of beer bottles and beverage bottles, and can still achieve efficient label removal when the bottle washing temperature ≤90°C.

[0020] The advantages or beneficial effects in the above - mentioned technical solutions at least include:

[0021] 1. High-efficiency label removal and cleaning effect: Under low-temperature conditions, a 100% label removal rate can be achieved in only 5 - 8 minutes, with the glue residue ≤ 0.1%, and there are no scratches or damage to the printing layer on the bottle surface. At the same time, through the synergistic effect of EDTA and DTT, the technical problem of difficult peeling of the UV varnish coating is breakthroughly solved;

[0022] 2. Significantly energy-saving and consumption-reducing: The bottle washing temperature is reduced to 88 - 90°C, compared with the traditional high-temperature process ≥ 95°C, reducing steam energy consumption by 20 - 30%. At the same time, the staged heating process optimizes the activation path of the additives, reducing ineffective heat loss, and the equipment operation efficiency is increased by 15%;

[0023] 3. Green environmental protection and safety: The composite label removal additive (EFA) does not contain harmful substances such as heavy metals and VOCs, can be directly neutralized and discharged, meeting environmental protection standards. At the same time, low-temperature operation avoids the risk of high-temperature lye splashing, reduces the accident rate of worker burns, and improves production safety;

[0024] 4. Prolong the service life of the equipment: The low-temperature environment reduces the thermal expansion and corrosion of the metal parts of the equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] The drawings illustrate exemplary embodiments of the present invention and, together with the description thereof, are used to explain the principles of the present invention. These drawings are included to provide a further understanding of the present invention, and the drawings are included in this specification and form a part of this specification.

[0026] Figure 1 A block diagram of the low-temperature rapid bottle washing process of the embodiment of the present invention is shown;

[0027] Figure 2 A comparison diagram of the effects of adding and not adding the composite label removal additive in the second embodiment of the present invention is shown. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Embodiments of the present invention will be described in more detail below with reference to the drawings. Although some embodiments of the present invention are shown in the drawings, it should be understood that the present invention can be implemented in various forms and should not be construed as limited to the embodiments set forth herein. On the contrary, these embodiments are provided to more thoroughly and completely understand the present invention. It should be understood that the drawings and embodiments of the present invention are only for exemplary purposes and are not used to limit the protection scope of the present invention.

[0029] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments can be combined with each other. The present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0030] It should be understood that the term "including" and its variants used herein are open-ended, that is, "including but not limited to". The term "based on" means "at least partially based on". The term "one embodiment" means "at least one embodiment"; the term "another embodiment" means "at least one additional embodiment"; the term "some embodiments" means "at least some embodiments". The relevant definitions of other terms will be given in the following description. It should be noted that the concepts such as "first", "second", etc. mentioned in the present invention are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0031] It should be noted that the modifications of "one" and "several" mentioned in the present invention are illustrative rather than restrictive. Those skilled in the art should understand that, unless otherwise clearly specified in the context, it should be understood as "one or more".

[0032] The names of the messages or information exchanged between multiple devices in the embodiments of the present invention are only for illustrative purposes and are not used to limit the scope of these messages or information.

[0033] [Low-temperature and rapid bottle washing process for coating UV varnish trademarks according to an embodiment of the present invention]

[0034] According to Figure 1 , the present invention provides a low-temperature and rapid bottle washing process for coating UV varnish trademarks, comprising the following steps:

[0035] I. Raise the temperature of the caustic solution in the bottle washer to 60°C, add sodium carbonate, sodium silicate and alkyl polyglycoside (APG) in the composite label removal aid, and stir until completely dissolved;

[0036] II. Raise the temperature to 80°C, add sodium gluconate and trisodium citrate, and continue to stir and dissolve;

[0037] III. Further raise the temperature to 88 - 90°C, add EDTA, dithiothreitol (DTT) and urea, keep the temperature constant and mix evenly, and then feed the bottles for production;

[0038] IV. The bottle washing process parameters are: caustic solution concentration 2.8 - 3.2%, temperature 88 - 90°C, composite label removal aid addition amount 2.0 - 2.5%, bottle washing speed 28,000 - 30,000 bottles per hour.

[0039] Specifically, the soaking time of the caustic solution on the UV varnish trademark during the bottle washing process is 5 - 8 minutes, and there is no damage to the surface printing of the trademark after elution, and the glue is completely de-adhered.

[0040] Specifically, the bottle washing process further includes a pre-washing step. The concentration of the lye in the pre-washing machine is 3.0 - 3.5%, the temperature is 90 - 93°C, and the addition amount of the composite label removing aid is 2.0 - 2.5%.

[0041] Specifically, the dissolution aid is heated in stages to activate the label removing functions of different components in sequence. Among them, the penetrant is dissolved at 60°C, the chelating agent is activated at 80°C, and the crosslinking breaker is triggered at 88 - 90°C.

[0042] [Composite label removing aid according to an embodiment of the present invention]

[0043] The present invention provides a composite label removing aid, which includes the following components by mass percentage:

[0044]

[0045]

[0046] Specifically, the EDTA is sodium ethylenediaminetetraacetate, and its synergistic effect with dithiothreitol (DTT) is used to destroy the crosslinked structure of the UV varnish coating and decompose the viscous components of the label glue at the same time. Among them, EDTA chelates metal ions to destroy the UV varnish coating, and DTT reduces the disulfide bonds in the glue. The superposition of the two achieves the dual effects of "coating peeling + glue losing viscosity".

[0047] Specifically, the alkyl polyglycoside (APG) is a non-ionic surfactant with a C8 - C12 chain length, which is used to improve the permeability and dispersibility of the lye to the UV varnish layer.

[0048] [Application prepared by the low-temperature and rapid bottle washing process according to an embodiment of the present invention]

[0049] The low-temperature and rapid bottle washing process according to an embodiment of the present invention is applied to the low-temperature elution of UV varnish labels coated on the surfaces of beer bottles and beverage bottles, and efficient label removal can still be achieved when the bottle washing temperature ≤ 90°C.

[0050] [Example 1]

[0051] Beer bottle UV varnish label elution process:

[0052] 1. Process conditions: Lye concentration: 3.0% (mass fraction), temperature: 88°C;

[0053] Addition amount of composite label removing aid (EFA): 2.2%, among which, the formulation ratio is: sodium carbonate 22%, sodium silicate 7%, APG 14%, EDTA 16%, DTT 6%, urea 6.5%;

[0054] 2. Soaking time: 6 minutes, bottle washing speed: 29,000 bottles / hour;

[0055] 3. Process steps: Pre-washing stage: Immerse in an alkaline solution at 60°C for 1 minute to activate the penetration function of APG and allow the auxiliary agent to penetrate into the gaps of the UV varnish coating;

[0056] Main washing stage: Raise the temperature to 88°C. EDTA chelates the metal ions in the coating, DTT decomposes the disulfide bonds of the glue, and urea promotes the diffusion of the auxiliary agent to achieve synchronous peeling of the coating and the glue;

[0057] 4. Results:

[0058] The label removal rate is 100%. The glue completely loses its stickiness, and the trademark printing layer is not damaged.

[0059] [Example 2]

[0060] Comparison of the cleaning effects of the bottle body when a composite label removal auxiliary agent is added or not added to the alkaline solution:

[0061] According to Figure 2 , after adding a composite label removal auxiliary agent to the alkaline solution, when the temperature of the alkaline solution is maintained at 90°C for 6 minutes, the stickiness of the trademark glue will drop to the extent that it can be peeled off;

[0062] After not adding a composite label removal auxiliary agent to the alkaline solution, when the temperature of the alkaline solution is maintained at 100°C for 6 minutes, the stickiness of the trademark glue will drop to the extent that it can be peeled off, but its temperature is high and the heat loss is large;

[0063] After not adding a composite label removal auxiliary agent to the alkaline solution, when the temperature of the alkaline solution is maintained at 90°C for 10 minutes, the stickiness of the trademark glue will drop to the extent that it can be peeled off, but its reaction time is long, resulting in a slow cleaning speed;

[0064] After not adding a composite label removal auxiliary agent to the alkaline solution, when the temperature of the alkaline solution is maintained at 80°C for more than 10 minutes, the trademark glue still has stickiness, the label removal effect is poor, and secondary manual label removal processing is required.

[0065] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0066] Those skilled in the art should understand that the above embodiments are only for clearly explaining the present invention, rather than limiting the scope of the present invention. For those skilled in the art, other changes or modifications can be made on the basis of the above disclosure, and these changes or modifications are still within the scope of the present invention.

Claims

1. A low-temperature rapid bottle washing process for coating UV varnish trademarks, characterized in that: The following steps are involved:

1. Raise the temperature of the bottle washing machine alkali solution to 60°C, add sodium carbonate, sodium silicate and alkyl polyglycoside (APG) in the composite label removal agent, and stir until completely dissolved; 2. Raise the temperature to 80°C, add sodium gluconate and trisodium citrate, and continue stirring to dissolve; 3. Further raise the temperature to 88-90°C, add EDTA, dithiothreitol (DTT) and urea. Keep constant temperature and mix evenly before bottle production; 4. Bottle washing process parameters are: alkali solution concentration 2.8-3.2%, temperature 88-90℃, compound delabeling agent addition amount 2.0-2.5%, bottle washing speed 28,000-30,000 bottles / hour.

2. The low-temperature rapid bottle washing process for coating UV varnish trademarks according to claim 1 is characterized by: The composite delabeling auxiliary agent comprises the following components by mass percentage: 20-25% of sodium carbonate, 6-8% of sodium silicate, 12-15% of alkyl glycoside (APG), 7-8% of sodium gluconate, 6-8% of trisodium citrate, 15-18% of EDTA, 5-8% of dithiothreitol (DTT) and 6-7% of urea.

3. The composite label removal auxiliary agent according to claim 2, characterized in that: The EDTA is ethylenediaminetetraacetic acid sodium salt.

4. The low-temperature rapid bottle washing process for coating UV varnish trademarks according to claim 1 is characterized by: During the bottle washing process, the UV varnish trademark is soaked in the alkali solution for 5-8 minutes.

5. The composite label removal aid according to claim 2, characterized in that: The alkyl polyglycoside (APG) is a nonionic surfactant with a chain length of C8-C12.

6. The low-temperature rapid bottle washing process for coating UV varnish trademarks according to claim 1 is characterized by: The bottle washing process also includes a pre-washing step, wherein the concentration of the pre-washing machine alkali solution is 3.0-3.5%, the temperature is 90-93° C., and the addition amount of the composite label removal auxiliary agent is 2.0-2.5%.

7. An application of the low-temperature rapid bottle washing process according to any one of claims 1 to 4, characterized in that: It is suitable for low-temperature washing of UV varnish trademarks coated on the surface of beer bottles and beverage bottles.

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