Hot melt film gluing method

Hot melt filmglue method is what kind?

1. Roller gluing.

The molten hot melt film is transported to the rotating rubber tank, and the rubber roller rotates in the rubber tank, so that the molten hot melt adhesive on the rubber roller is evenly scraped by the scraper, and the product contacts the rotating rubber roller to evenly coat the glue. This gluing method is mainly used for coating and composite fabrics, gluing plates, etc.

2. Foaming and gluing.

In some special applications, in order to obtain the function of buffering or shock absorption and reduce the amount of glue used, a foaming melt glue machine can be used to mechanically mix nitrogen into the molten hot melt glue to form an expanded hot melt glue.Pieces. And the hot melt adhesive that has been mechanically foamed is coated on the workpiece through the nozzle. Foaming technology has been widely used in the combination of auto parts to replace traditional rubber gaskets.

3. Spiral spray glue.

This is a common way of spraying glue. The hot melt adhesive is removed by external air pressure from the regular spiral glue line in the spray plate with fine orifice in the nozzle. In this way, the amount of glue per unit area can be reduced. Most construction adhesives for diapers and sanitary napkins are applied by spiral spraying.

4. Flat die scraping.

This is a common way of scratching. molten hot melt adhesivePiecesAfter passing through the heated throat, it is evenly distributed in the guide channel in the die, and then extruded from a specific part of the die with a predetermined film thickness and width. Most industrial hot melt tapes and labels are coated by a scratch die process.

5. dispensing glue.

When two adhesive stickers only need to be combined in certain positions, dispensing is a fairly economical and simple process. The dispensing is often used to fold a combination of cartons or cardboard.

6. Adhesive tape bonding.

Similar to dispensing, this process can be used when two pasted objects only need to be combined into a strip. A common application is the edge connection of plastic boxes, such as PET curtain boxes, wine bottle boxes and cosmetic boxes.

hot melt adhesivePiecesWhat are the technical requirements for operation?

Heating conditions.

Use hot melt adhesivePiecesWarm up before. Generally preheated for 1~2 hours, after reaching the heating temperature and fluidity, put it into the glue tank of 160~180, and it can be used normally. To strictly control the use of temperature. If the temperature is too high, the bonding force will decrease, the fluidity and permeability will increase, and the viscosity and strength will decrease, which will affect the bonding strength of books and periodicals. When the temperature of the adhesive is too low, the viscosity increases, the fluidity and permeability decrease, the adhesive becomes thick and brittle, and the adhesive effect deteriorates. In order to prevent degumming and loose pieces, the gluing temperature should be controlled in the range of 170~180. In order to ensure the quality of gluing, the glue tank should be cleaned regularly to remove the aging sediment. In the low temperature and cold season, do not press the back of the book hard to prevent it from freezing and brittle. When used, it should be thawed at room temperature.

Stability of hot melt film.

Refers to the stability after recovery or long-term heating. If the thermal stability is poor, the color of the adhesive will become darker, the viscosity will increase, the permeability will decrease, and the bonding strength will be affected.

hot melt adhesivePiecesSimple identification of quality.

hot melt adhesivePiecesThere are many quality indicators, which require special instruments and suitable test environment. In the absence of instruments and equipment, first look at whether the type of adhesive is consistent, whether there are bubbles in the appearance. Next, the adhesive was melted to prepare a tape having a width of about 1cm and a thickness of 0.2cm. After cooling, stretch the tape by hand to see if the stretch rate can reach the standard, whether the strength is sufficient, and whether the fracture color can remain unchanged. If there is a powdery substance, it means that the filler is too much or unevenly mixed, or the filler particle size is too large, which will cause serious quality accidents. Next, the colloidal particles were stored at 0 for 24 hours and then removed and beaten with a hard object. If brittle fracture occurs, it indicates poor low temperature resistance. In addition, if the adhesive is soft, self-adhesive or sticky after being placed at 40 for a certain period of time, it indicates that the softening point of the hot melt adhesive is low.