Paper Packaging Sealant Advantages

With the progress of social civilization and the demand of the market, more and more new materials and processes are widely used in the packaging industry, and sealing glue has become an important material for combining a complete package—products. Used in the packaging industry. In the process of producing and selling various sealing glues, we have had more contacts with many domestic printing and packaging companies. During this contact process, we discovered that many packaging companies (including some large printing and packaging companies) Printing is an expert, but the knowledge of sealing glue is not enough. Many of them are blind even when they choose and use sealing glue, which also brings great losses and waste to packaging companies. "Difficult to bond" has become a specter that has plagued packaging companies, and has caused headaches for almost every packaging and printing company.

Our company is a professional manufacturer of paper packaging adhesives. We believe that as long as you choose and use good adhesives, the problem of “difficult bonding” can be completely solved. Integrated lessons many packaging companies, their problems are out in the "Select, using the" two links. In order to let many colleagues who are engaged in technical work, quality management, and supply work understand the sealing glue more closely, make “bonding difficult” become “easy to bond” and “worry glue” to “reliable glue”. Our company has prepared This article aims to discuss with the domestic counterparts, quality standards and methods of use.

How to choose adhesive

1. Understand the use of features

Any kind of sealing glue is not a panacea, and a sealing glue can only be suitable for a certain kind or a certain kind of specific glued material. Some packaging companies are blindly using plastic with “try it out”, which is a waste of time and effort and also causes great losses. Nowadays, BOPP (biaxially oriented polypropylene film) papers, polished papers, PET (polyester film) papers, and high-glossy papers are commonly used as bonding materials for packaging companies. In fact, these products only require more of our company. Functional paper/plastic sealant. In addition, some packaging companies have film/film bonding requirements and can use our multi-functional plastic/plastic sealing glue, which can be used in addition to film/film bonding, and can also be used for the above listed: BOPP/Paper, Polished /Paper, PET/paper, high gloss paper/paper, but this product can only be used for manual bonding. Taken together, the above two products can basically meet all bonding requirements of all printing and packaging companies, except for special requirements such as PVC/paper, PVC/wood, UV/paper, etc. These products can be used to solve other models of our company's adhesives. .

2. Quality Standard

In addition to solving product features, you must also understand the quality of the product. As any kind of sealing glue, it has its own chemical standard, and the chemical standard is determined by the formula and process. A same chemical standard must reflect good physical standards (ie, application standards). We think that the packaging industry is the most Important physical standards (application standards) are: a. Adhesion strength (adhesion); b. High temperature resistance; c. Low temperature resistance; d. Moisture-resistant ion; e. Sticky. Many domestic packaging companies appear to have poor adhesion, or the debonded products and the brittle films that are bonded for a period of time are basically all of the above (except the bonding process is unreasonable), so often heard The printing and packaging company's peers said, "Some days of glue degumming, and some glue no matter how hot the sky, the storage time is not long." This statement is actually caused by a lack of deep understanding of how to select and use sealing glue. What is more serious is that some manufacturers of sealing glue do not know why they need to degumming, and how to formulate formulas for special requirements under different concentrations. , formulate processes and develop products. Therefore, it is not surprising that quality problems occur during use.

3. price

Select version of syrup, quality is certainly the first one. Some packaging companies blindly believe that the higher the price is, the better the quality is, or the lower the price is, the worse the quality is. These views are very one-sided. As a result, some packaging companies have both spent money and caused great losses. In fact, before the addition of fountain solution, the cost of the product only occupies a very small proportion, so we believe that firstly under the premise of understanding the characteristics, quality standards, and performance of the product, we must seek a suitable price. We think this is reasonable. of.

Multifunctional paper/plastic sealant properties and methods of use

Sealing adhesive is the most widely used viscose in the printing and packaging industry. The adhesive has been widely used in domestic packaging for its advantages of firmness and reliability, good adhesion, high and low temperature resistance, good moisture resistance, moderate hardness, and wide application range. The long-term adoption of the enterprise has been well received by many packaging companies.

1. Scope of application

According to the different bonding interface can be divided into BOPP / paper, polishing / paper, PET / paper, paper / paper, ink / paper, UV glazing / paper strong fast bonding. The glue extension sticks and sticks two kinds of types, but also can stick glue printing, basically meets the requirements of all types of packaging companies now bonding materials.

2. Product Features

1 Brushing is better. When thinning the product by hand when brushing it, the product can be diluted with water, and the mixing should be even. The amount of water to be added depends on the type of the sealant and the thickness of the adhered material and should be controlled between 2% and 10%.

2 The speed of initial sticking is high, it can be bonded on the automatic sealing machine at high speed, and it can be pressed for half an hour when it is hand-bonded.

3 The film is flexible, has good adhesion to the film surface and the glossy surface, and has strong adhesive strength.

4 good resistance to cold and heat, good bonding products in 60 ~ C baking 72 hours or an IO ~ C (refrigerator freezer) frozen 72 hours, the adhesive strength remained the same, the product does not degummed, the film is not Brittle.

5 The rubber film has flexibility and long-term pressure sensitivity, and its adhesive strength is good.

3. How to use and precautions

1 When using hand glue, depending on the type of sealing glue, it is usually left to dry for 2-6 minutes after brushing. After the film is translucent, it should be glued again to avoid glue overflow.

2 The glue has a certain degree of moisture resistance, so when wild rubber can be used, cotton yarn, gasoline or ethyl ester solvent can be wiped lightly.

3 According to its quick-drying, it should not be brushed repeatedly, so as not to affect the brushing property.

4 The amount of glue should be moderate, use manual brushing method of gluing, usually the amount of glue should be controlled at about lOOg/m', or according to the specific product adhesive strength requirements, the specific amount of glue can be based on the speed of paper and water absorption and The temperature is high and low. Less water-absorbing paper is less likely to be glued, and when the temperature is low, the glue is less, whereas the glue is more. After bonding, the size of the adhered product should have enough pressure to ensure that the two adhered surfaces are fully in contact and pressed for at least 0.5 hours before entering the next process.

5 When using machine adhesive, the amount of sizing should be controlled at the discharge port. The workpiece should not be degummed. If the sizing amount is too large, the glue overflows. If the sizing amount is too small, the adhesive strength will be affected. If the substrate is too thin, the sizing amount may be adjusted to avoid degumming at the discharge end.

Adhesive properties and inspection methods for sealing glue

A batch of finished packaging boxes is not used immediately. Sometimes it is possible to stock for several months or even a year. Therefore, it is very important that the sealing glues have good resistance to cold and heat, moisture resistance, and aging resistance. For example, some packaging boxes work well for a short period of time, and after a period of time, degumming and film brittleness have occurred. So in the end to determine a kind of sealing adhesive adhesive properties in the end how to do the following aspects of the test.

1. A bonded package was torn along the edge of the seam to see if the paper base was torn and the base of the paper attached to the film was scratched with a nail. If only a small amount of paper base can be torn off at a time or no paper base can be scraped at all, it indicates that the adhesive has no problem with the adhesion on the film. For the plastic/plastic bonding interface, since the two adhered surfaces are BOPP films, the film cannot be destroyed because of its strong flexibility, so it can be felt that the two adherends have larger peeling strength when tested. Film can not be brittle.

2. Bonded packaging box (at least 24 hours after curing) placed in 60 "(2 thermostat oven baked for 72 hours out of the cooling after the seam or bottom does not pop open, while the hands do not take off the packaging box, plastic film is not Brittleness indicates that the adhesive has no problem with heat resistance.
'
3. Place the bonded packaging box (at least 24 hours after curing) in the refrigerator freezer and freeze it for 72 hours. After the water is dry, the packaging box will not be debonded by hand. The film will not be brittle, indicating that the adhesive There is no problem with the low temperature resistance.

4. The product of the first three types of adhesives adhered by the sealing glue holds some samples. Each half a month is inspected for one box, both hands are not debonded, and the film is not brittle. There is no problem during continuous inspection for six months, indicating that the seal The glue can be used with confidence.

Analysis of Common Problems and Causes of Sealing Gloves in Use and Storage of Finished Products

1. Problems that may easily occur in the bonding process: (1) A too large amount of glue leads to glue overflow after press-fitting, which not only affects the aesthetics of the product, but also tends to cause blocking between the boxes. This situation should be appropriately reduced the amount of glue and glue should be left open for 2-6 minutes until the film is translucent and then bonded. (2) The glue brush is too thin and the open time is too long, resulting in poor adhesive fastness, and sometimes it may not be bonded at all. When this happens, look carefully at the instruction manual or consult the manufacturer. (3) There is no pressing or the pressure is too small, which causes the bonded product to spring open automatically. This situation is mainly for products with large stiffness. Since the two adhered surfaces do not have sufficient contact after bonding, they must be squeezed at least half. hour. Because many adhesives are contact-type adhesive, it is necessary to effectively press the two adhered surfaces. In the unit of time, if the adhesive force is lower than the product's own elasticity, the product will pop open, so the general product requires a half-hour squeeze. time. (4) Some manufacturers in order to save the use of laminating adhesive mixed with white plastic adhesive box, or use a larger amount of water to dilute the sealing adhesive, resulting in insufficient adhesion fastness and poor adhesion on the film. This situation is very dangerous, but also a serious violation of the principle of bonding and: good art, I hope that the users of the sealant must not blindly use plastic, so as not to cause greater losses.

2. Adhesive production: The problems that occur in the storage process: (1) Degumming occurs in the box during the winter. The main reason is that some of the sealing glues have poor low-temperature resistance, and the loss of activity on the surface of the sealant below 5°C results in a decrease or disappearance of the adhesive strength. (2) The hot summer sticky packaging box pops out and debonds in the warehouse or transport box. The main reason is that the high temperature resistance of the silicone sealant is not good, and the adhesive layer becomes soft at a temperature of 50-60C, and the strength becomes smaller, leading to degumming of the packaging box. (3) The bonding effect of the packaging box is very good in the early stage of sticking (within half a month), and the degumming of the packaging box occurs with the extension of the time. The main reason is that the sealing glue itself has poor tackiness. Most of the plastics in the sealing glue are filled with some plasticizers. As the time goes by, the plasticizer migrates to the paper base, which causes the adhesive layer to become hard, brittle, and even degummed. . On the other hand, because the sealing glue contains a large number of unsaturated bonds, the anti-aging properties of the product are not good, and the storage period is prolonged. The film becomes brittle and the product is degummed. (4) The warehouse is very humid, and it is not only the humidity of the product exceeding the standard but also the product degumming. The main reason is that the product absorbs water, and the water resistance of the sealant itself is not good, resulting in soft delamination of the adhesive layer. The series of sealing glue produced by our company has certain water resistance, so its overflow glue must be wiped with solvent, and the container cleaning uses water and solvent. (Text / Chongqing