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Those hot melt adhesive for automotive filter

  • Author:Tongde
  • Source:www.tdhotmeltglue.com
  • Release on :2018-11-24
In general, the types of automotive filters are drum type, plate type, irregular type, etc. Trucks, freight cars, etc. usually use drum type filters, while family cars and SUVs usually use the plate type filter. As the automotive industry pays more and more attention to the requirements of light-weight, noise reduction, low emission, low VOC, energy saving and environmental protection, it also has specific requirements for automotive filter hot melt adhesive: filter hot melt adhesive should be environmentally friendly, non-toxic, fast curing, low odor, low VOC, and a wide range of bonding. So what are the specific applications and requirements for the automotive filters ? ? In fact, the adhesion of automotive filters mainly contains filter paper pleating, filter spine fixation, filter paper joints, filter frame bonding and so on.

hot melt adhesive for automtive filter


1. Hot melt adhesive for Filter paper pleating
In the manufacturing process, the automobile air conditioner filter firstly puts the whole roll of filter paper on the paper folding machine and folds it at a speed of about 50 to 80 meters per minute. The pleating width depends on the size specifications of the filter product; After folding and forming, it quickly enters the spraying process of the hot melt adhesive. The hot melt adhesive sprays the fixed glue line on the folded filter paper at normal speed. Sometimes is four or more glue lines sprayed, and the filter paper is glued on one side or double-sides. Then adhesive is quickly cured, so that the folded filter paper is fixed and not bounced; then cut into a specific size according to the specifications of filter.After the glue is applied, generally quality test of the filter requires that filter is placed in a Constant temperature oven and placed vertically at 90 degrees for 24 hours to see the changei. It is required that there is no displacement or deformation.
hot melt adhesive for filter paper pleating


2. Hot melt adhesive for Filter spine fixation
For the filter of home cars, SUVs, etc., in order to reinforce the filter, a special spine glue lines are placed on the filter element to connect filter papers to keep firm.  At same time, PA polyamide hot melt adhesive is commonly used. Who has a good hardness to keep filter firm and  also has certain flexibility to protect from brittle if at lower temperature. Always different filter manufacturers will have different requirements for high and low temperature resistance. Hot melt adhesive manufacturers will also recommend suitable hot melt adhesives according to their specific requirements.
hot melt adhesive for filter spine


3. Hot melt adhesive for Filter paper joints
It refers to the joint bonding of the filter paper at the end, the joint between both sides of the filter paper, usually filter factory adapts EVA hot melt adhesive, PO hot melt adhesive, PA hot melt adhesive. While air filter jointing commonly use EVA or PO hot melt adhesive, and the oil filter joints is now mostly bonded with PA or polyurethane hot melt adhesive. PA polyamide hot melt adhesives have very good resistance to high temperatures and oils. Its appearance can be PA glue stick, which is melted with a hot melt glue gun, manually coated on the interface filter paper, also it can be granule which melt by a hot melt glue machine, automatically clamped with mechanical equipment for seaming.
hot melt adhesive for filter paper joint


4.  Hot melt adhesive for Air conditioner filter frame bonding
In this process, hot melt glue mainly is applied to the bonding and sealing of the filter paper and the filter frame,hot melt glue sticks can be used for manual injection and filling, it is often seen in those factories who operates small scale or smaller size of filters, and some filter manufacturers prefer to use a hot melt glue machine with a small scraper to spray hot melt adhesive on inside of the filter frame, and then filter paper is fast attached. It usually can be seen in those factories who have large production capacity.
hot melt adhesive for filter frame


For this part, EVA or PO hot melt adhesive will be often used,property should include heat resistance and odorless, mostly is white color. Common air conditioner filter requires 65℃ resistance at least, while some who wanna higher resistance will reach 110℃,all depends filter manufacturer’s demand. Tongde Filter frame bonding hot melt glue can fit both requirement, welcome to inquire us.

Specially some kind filter becomes flexible or soft, see below filter, filter can be easily to bend. It will require hot melt glue is soft or flexible after solid at same time.
Soft hot melt adhesive for Flexible air Filter

It is difficult to get this materials, however Shenzhen Tongde New Materials succeed developing such soft hot melt adhesive, welcome to contact us.

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