News - How to glue woods together ?

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How to glue woods together ?

Step one . Wood control:
1. Control of moisture content: below 14%; 2. Keep the splicing surface flat, and there should be no wavy or curved or twisted surfaces. For wood that is easily deformed (such as oak, ash, etc.), it must be planed on the same day. Finished on the same day, the overnight ones must be re-planed; 3. The wood dust and dirt on the surface of the wood must be removed before splicing.
Step two. The method of adjusting glue:
1. When mixing the curing agent, determine the amount of glue according to the size of the glue container. Only one third of the volume can be used in the glue container to adjust the glue, otherwise it will cause the glue to react and bubble and overflow.
2. It is best to use a flat-bottomed round plastic bucket to adjust the glue. This kind of container is easy to mix the curing agent evenly.
3. Do not add water or other substances to the glue, otherwise it will cause solidification or a sharp drop in strength.
4. The water based glue formulated with curing agent is generally required to be used up within 12 hours (the effect of using it after the foaming is completed is more significant).
5. The unused curing agent must be stored strictly sealed, and no water can be mixed in, so as to avoid hardening and scrapping.
6. Once the amount of curing agent is confirmed, it cannot be changed arbitrarily, otherwise it will seriously affect key functions such as bonding strength and water resistance.
Step three. Control of the amount of glue applied:
The user should decide the amount of glue to be applied according to the temperature and humidity of the space at the time of the day. When the space temperature is low, the humidity is high (below 80%), and the wood is hard, the amount of glue should be less; when the space temperature is high, the humidity is low (below 60%), and the wood is soft, the amount of glue should be more.
Step four. Gluing method:
Due to the large viscosity (consistency) of the glue, it is best to use a manual glue applicator, a pig hair brush or a rubber spatula to apply the glue evenly. The amount of glue is generally controlled between 150g-250g/m (hard wood sizing) 120g-150 g/m, pine cork sizing 120g-250 g/m). After the workpieces are coated with glue, they must be spliced ​​together as soon as possible to prevent the surface of the colloid from forming a film, so as to avoid false splicing and easy opening of the glue.
Step five. Pressurization method and pressurization time:
No matter which pressure method is used, it is necessary to maintain a uniform pressure of multiple points with a pressure point of 30-50 cm. The time control of pressurization depends on the temperature and air humidity of the work site. Except for the pressurization time of the disc jigsaw which is 30-40 minutes, other pressurization methods are normally defined as (at 25℃, humidity 60% Below) 2-4 hours. In the conditions of high temperature and low humidity, the pressing time can be shortened to about one hour; otherwise, it takes 4 hours or more.
Step six. Check during pressurization:
Pay attention to prevent the wooden strips from being pulled out during pressurization (unevenness and large and small heads are most likely to occur), if they are pulled out, they should be loosened and reset, and cannot be forced to reset; see if there is any glue overflow in the seam, if there is no glue overflow, it means that the amount of glue is not enough Or the pressure is too long after the glue is applied, and this phenomenon should be corrected immediately. The pressure inspection process cannot be ignored.
Step seven. Maintenance period after pressure relief:
In the solid wood paneling or tooth jointing process, in order to prevent the glue from being opened, the jointed workpieces must be piled up and maintained after the pressure is relieved. According to different woods under different climatic conditions, it is necessary to set a curing time period to ensure the normal use of the next process. We recommend: the best time for curing under the conditions of low temperature, high humidity and hard wood Set in 3-5 days: When stacking and curing under the conditions of high temperature, low humidity and soft wood, the best time is set at 1-2 days.
Step eight. Treatment of unused remaining glue:
If the jigsaw glue prepared with curing agent cannot be used up for a while, it must be sealed and stored temporarily and will be used again next time (not exposed to the air for a long time to prevent dry skin), and it will not affect the splicing quality.


Post time: Sep-01-2021